// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package google.storage.v2;

import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/api/routing.proto";
import "google/iam/v1/iam_policy.proto";
import "google/iam/v1/policy.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/timestamp.proto";
import "google/rpc/status.proto";
import "google/type/date.proto";

option go_package = "cloud.google.com/go/storage/internal/apiv2/storagepb;storagepb";
option java_multiple_files = true;
option java_outer_classname = "StorageProto";
option java_package = "com.google.storage.v2";
option (google.api.resource_definition) = {
  type: "cloudkms.googleapis.com/CryptoKey"
  pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/cryptoKeys/{crypto_key}"
};

// ## API Overview and Naming Syntax
//
// The Cloud Storage gRPC API allows applications to read and write data through
// the abstractions of buckets and objects. For a description of these
// abstractions please see [Cloud Storage
// documentation](https://cloud.google.com/storage/docs).
//
// Resources are named as follows:
//
//   - Projects are referred to as they are defined by the Resource Manager API,
//     using strings like `projects/123456` or `projects/my-string-id`.
//   - Buckets are named using string names of the form:
//     `projects/{project}/buckets/{bucket}`.
//     For globally unique buckets, `_` might be substituted for the project.
//   - Objects are uniquely identified by their name along with the name of the
//     bucket they belong to, as separate strings in this API. For example:
//
//         ```
//         ReadObjectRequest {
//         bucket: 'projects/_/buckets/my-bucket'
//         object: 'my-object'
//         }
//         ```
//
// Note that object names can contain `/` characters, which are treated as
// any other character (no special directory semantics).
service Storage {
  option (google.api.default_host) = "storage.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform,"
      "https://www.googleapis.com/auth/cloud-platform.read-only,"
      "https://www.googleapis.com/auth/devstorage.full_control,"
      "https://www.googleapis.com/auth/devstorage.read_only,"
      "https://www.googleapis.com/auth/devstorage.read_write";

  // Permanently deletes an empty bucket.
  // The request fails if there are any live or
  // noncurrent objects in the bucket, but the request succeeds if the
  // bucket only contains soft-deleted objects or incomplete uploads, such
  // as ongoing XML API multipart uploads. Does not permanently delete
  // soft-deleted objects.
  //
  // When this API is used to delete a bucket containing an object that has a
  // soft delete policy
  // enabled, the object becomes soft deleted, and the
  // `softDeleteTime` and `hardDeleteTime` properties are set on the
  // object.
  //
  // Objects and multipart uploads that were in the bucket at the time of
  // deletion are also retained for the specified retention duration. When
  // a soft-deleted bucket reaches the end of its retention duration, it
  // is permanently deleted. The `hardDeleteTime` of the bucket always
  // equals
  // or exceeds the expiration time of the last soft-deleted object in the
  // bucket.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.delete` IAM permission on the bucket.
  rpc DeleteBucket(DeleteBucketRequest) returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters { field: "name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "name";
  }

  // Returns metadata for the specified bucket.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.get`
  // IAM permission on
  // the bucket. Additionally, to return specific bucket metadata, the
  // authenticated user must have the following permissions:
  //
  // - To return the IAM policies: `storage.buckets.getIamPolicy`
  // - To return the bucket IP filtering rules: `storage.buckets.getIpFilter`
  rpc GetBucket(GetBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "name";
  }

  // Creates a new bucket.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.create` IAM permission on the bucket.
  // Additionally, to enable specific bucket features, the authenticated user
  // must have the following permissions:
  //
  // - To enable object retention using the `enableObjectRetention` query
  // parameter: `storage.buckets.enableObjectRetention`
  // - To set the bucket IP filtering rules: `storage.buckets.setIpFilter`
  rpc CreateBucket(CreateBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{project=**}" }
      routing_parameters {
        field: "bucket.project"
        path_template: "{project=**}"
      }
    };
    option (google.api.method_signature) = "parent,bucket,bucket_id";
  }

  // Retrieves a list of buckets for a given project, ordered
  // lexicographically by name.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.list` IAM permission on the bucket.
  // Additionally, to enable specific bucket features, the authenticated
  // user must have the following permissions:
  //
  // - To list the IAM policies: `storage.buckets.getIamPolicy`
  // - To list the bucket IP filtering rules: `storage.buckets.getIpFilter`
  rpc ListBuckets(ListBucketsRequest) returns (ListBucketsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{project=**}" }
    };
    option (google.api.method_signature) = "parent";
  }

  // Permanently locks the retention
  // policy that is
  // currently applied to the specified bucket.
  //
  // Caution: Locking a bucket is an
  // irreversible action. Once you lock a bucket:
  //
  // - You cannot remove the retention policy from the bucket.
  // - You cannot decrease the retention period for the policy.
  //
  // Once locked, you must delete the entire bucket in order to remove the
  // bucket's retention policy. However, before you can delete the bucket, you
  // must delete all the objects in the bucket, which is only
  // possible if all the objects have reached the retention period set by the
  // retention policy.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.update` IAM permission on the bucket.
  rpc LockBucketRetentionPolicy(LockBucketRetentionPolicyRequest)
      returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket";
  }

  // Gets the IAM policy for a specified bucket or managed folder.
  // The `resource` field in the request should be
  // `projects/_/buckets/{bucket}` for a bucket, or
  // `projects/_/buckets/{bucket}/managedFolders/{managedFolder}`
  // for a managed folder.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.getIamPolicy` on the bucket or
  // `storage.managedFolders.getIamPolicy` IAM permission on the
  // managed folder.
  rpc GetIamPolicy(google.iam.v1.GetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
      routing_parameters {
        field: "resource"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "resource";
  }

  // Updates an IAM policy for the specified bucket or managed folder.
  // The `resource` field in the request should be
  // `projects/_/buckets/{bucket}` for a bucket, or
  // `projects/_/buckets/{bucket}/managedFolders/{managedFolder}`
  // for a managed folder.
  rpc SetIamPolicy(google.iam.v1.SetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
      routing_parameters {
        field: "resource"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "resource,policy";
  }

  // Tests a set of permissions on the given bucket, object, or managed folder
  // to see which, if any, are held by the caller. The `resource` field in the
  // request should be `projects/_/buckets/{bucket}` for a bucket,
  // `projects/_/buckets/{bucket}/objects/{object}` for an object, or
  // `projects/_/buckets/{bucket}/managedFolders/{managedFolder}`
  // for a managed folder.
  rpc TestIamPermissions(google.iam.v1.TestIamPermissionsRequest)
      returns (google.iam.v1.TestIamPermissionsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
      routing_parameters {
        field: "resource"
        path_template: "{bucket=projects/*/buckets/*}/objects/**"
      }
      routing_parameters {
        field: "resource"
        path_template: "{bucket=projects/*/buckets/*}/managedFolders/**"
      }
    };
    option (google.api.method_signature) = "resource,permissions";
  }

  // Updates a bucket. Changes to the bucket are readable immediately after
  // writing, but configuration changes might take time to propagate. This
  // method supports `patch` semantics.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.buckets.update` IAM permission on the bucket.
  // Additionally, to enable specific bucket features, the authenticated user
  // must have the following permissions:
  //
  // - To set bucket IP filtering rules: `storage.buckets.setIpFilter`
  // - To update public access prevention policies or access control lists
  // (ACLs): `storage.buckets.setIamPolicy`
  rpc UpdateBucket(UpdateBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket.name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,update_mask";
  }

  // Concatenates a list of existing objects into a new object in the same
  // bucket. The existing source objects are unaffected by this operation.
  //
  // **IAM Permissions**:
  //
  // Requires the `storage.objects.create` and `storage.objects.get` IAM
  // permissions to use this method. If the new composite object
  // overwrites an existing object, the authenticated user must also have
  // the `storage.objects.delete` permission. If the request body includes
  // the retention property, the authenticated user must also have the
  // `storage.objects.setRetention` IAM permission.
  rpc ComposeObject(ComposeObjectRequest) returns (StorageObject) {
    option (google.api.routing) = {
      routing_parameters {
        field: "destination.bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Deletes an object and its metadata. Deletions are permanent if versioning
  // is not enabled for the bucket, or if the generation parameter is used, or
  // if soft delete is not
  // enabled for the bucket.
  // When this API is used to delete an object from a bucket that has soft
  // delete policy enabled, the object becomes soft deleted, and the
  // `softDeleteTime` and `hardDeleteTime` properties are set on the object.
  // This API cannot be used to permanently delete soft-deleted objects.
  // Soft-deleted objects are permanently deleted according to their
  // `hardDeleteTime`.
  //
  // You can use the [`RestoreObject`][google.storage.v2.Storage.RestoreObject]
  // API to restore soft-deleted objects until the soft delete retention period
  // has passed.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.delete` IAM permission on the bucket.
  rpc DeleteObject(DeleteObjectRequest) returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Restores a
  // soft-deleted object.
  // When a soft-deleted object is restored, a new copy of that object is
  // created in the same bucket and inherits the same metadata as the
  // soft-deleted object. The inherited metadata is the metadata that existed
  // when the original object became soft deleted, with the following
  // exceptions:
  //
  //   - The `createTime` of the new object is set to the time at which the
  //   soft-deleted object was restored.
  //   - The `softDeleteTime` and `hardDeleteTime` values are cleared.
  //   - A new generation is assigned and the metageneration is reset to 1.
  //   - If the soft-deleted object was in a bucket that had Autoclass enabled,
  //   the new object is
  //     restored to Standard storage.
  //   - The restored object inherits the bucket's default object ACL, unless
  //   `copySourceAcl` is `true`.
  //
  // If a live object using the same name already exists in the bucket and
  // becomes overwritten, the live object becomes a noncurrent object if StorageObject
  // Versioning is enabled on the bucket. If StorageObject Versioning is not enabled,
  // the live object becomes soft deleted.
  //
  // **IAM Permissions**:
  //
  // Requires the following IAM permissions to use this method:
  //
  //   - `storage.objects.restore`
  //   - `storage.objects.create`
  //   - `storage.objects.delete` (only required if overwriting an existing
  //   object)
  //   - `storage.objects.getIamPolicy` (only required if `projection` is `full`
  //   and the relevant bucket
  //     has uniform bucket-level access disabled)
  //   - `storage.objects.setIamPolicy` (only required if `copySourceAcl` is
  //   `true` and the relevant
  //     bucket has uniform bucket-level access disabled)
  rpc RestoreObject(RestoreObjectRequest) returns (StorageObject) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Cancels an in-progress resumable upload.
  //
  // Any attempts to write to the resumable upload after cancelling the upload
  // fail.
  //
  // The behavior for any in-progress write operations is not guaranteed;
  // they could either complete before the cancellation or fail if the
  // cancellation completes first.
  rpc CancelResumableWrite(CancelResumableWriteRequest)
      returns (CancelResumableWriteResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "upload_id"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "upload_id";
  }

  // Retrieves object metadata.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.get` IAM permission on the bucket.
  // To return object ACLs, the authenticated user must also have
  // the `storage.objects.getIamPolicy` permission.
  rpc GetObject(GetObjectRequest) returns (StorageObject) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Retrieves object data.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.get` IAM permission on the bucket.
  rpc ReadObject(ReadObjectRequest) returns (stream ReadObjectResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Reads an object's data.
  //
  // This bi-directional API reads data from an object, allowing you to request
  // multiple data ranges within a single stream, even across several messages.
  // If an error occurs with any request, the stream closes with a relevant
  // error code. Since you can have multiple outstanding requests, the error
  // response includes a `BidiReadObjectError` proto in its `details` field,
  // reporting the specific error, if any, for each pending `read_id`.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.get` IAM permission on the bucket.
  //
  rpc BidiReadObject(stream BidiReadObjectRequest)
      returns (stream BidiReadObjectResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "read_object_spec.bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Updates an object's metadata.
  // Equivalent to JSON API's `storage.objects.patch` method.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.update` IAM permission on the bucket.
  rpc UpdateObject(UpdateObjectRequest) returns (StorageObject) {
    option (google.api.routing) = {
      routing_parameters { field: "object.bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "object,update_mask";
  }

  // Stores a new object and metadata.
  //
  // An object can be written either in a single message stream or in a
  // resumable sequence of message streams. To write using a single stream,
  // the client should include in the first message of the stream an
  // `WriteObjectSpec` describing the destination bucket, object, and any
  // preconditions. Additionally, the final message must set 'finish_write' to
  // true, or else it is an error.
  //
  // For a resumable write, the client should instead call
  // `StartResumableWrite()`, populating a `WriteObjectSpec` into that request.
  // They should then attach the returned `upload_id` to the first message of
  // each following call to `WriteObject`. If the stream is closed before
  // finishing the upload (either explicitly by the client or due to a network
  // error or an error response from the server), the client should do as
  // follows:
  //
  //   - Check the result Status of the stream, to determine if writing can be
  //     resumed on this stream or must be restarted from scratch (by calling
  //     `StartResumableWrite()`). The resumable errors are `DEADLINE_EXCEEDED`,
  //     `INTERNAL`, and `UNAVAILABLE`. For each case, the client should use
  //     binary exponential backoff before retrying.  Additionally, writes can
  //     be resumed after `RESOURCE_EXHAUSTED` errors, but only after taking
  //     appropriate measures, which might include reducing aggregate send rate
  //     across clients and/or requesting a quota increase for your project.
  //   - If the call to `WriteObject` returns `ABORTED`, that indicates
  //     concurrent attempts to update the resumable write, caused either by
  //     multiple racing clients or by a single client where the previous
  //     request was timed out on the client side but nonetheless reached the
  //     server. In this case the client should take steps to prevent further
  //     concurrent writes. For example, increase the timeouts and stop using
  //     more than one process to perform the upload. Follow the steps below for
  //     resuming the upload.
  //   - For resumable errors, the client should call `QueryWriteStatus()` and
  //     then continue writing from the returned `persisted_size`. This might be
  //     less than the amount of data the client previously sent. Note also that
  //     it is acceptable to send data starting at an offset earlier than the
  //     returned `persisted_size`; in this case, the service skips data at
  //     offsets that were already persisted (without checking that it matches
  //     the previously written data), and write only the data starting from the
  //     persisted offset. Even though the data isn't written, it might still
  //     incur a performance cost over resuming at the correct write offset.
  //     This behavior can make client-side handling simpler in some cases.
  //   - Clients must only send data that is a multiple of 256 KiB per message,
  //     unless the object is being finished with `finish_write` set to `true`.
  //
  // The service does not view the object as complete until the client has
  // sent a `WriteObjectRequest` with `finish_write` set to `true`. Sending any
  // requests on a stream after sending a request with `finish_write` set to
  // `true` causes an error. The client must check the response it
  // receives to determine how much data the service is able to commit and
  // whether the service views the object as complete.
  //
  // Attempting to resume an already finalized object results in an `OK`
  // status, with a `WriteObjectResponse` containing the finalized object's
  // metadata.
  //
  // Alternatively, you can use the `BidiWriteObject` operation to write an
  // object with controls over flushing and the ability to fetch the ability to
  // determine the current persisted size.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.create`
  // IAM permission on
  // the bucket.
  rpc WriteObject(stream WriteObjectRequest) returns (WriteObjectResponse) {}

  // Stores a new object and metadata.
  //
  // This is similar to the `WriteObject` call with the added support for
  // manual flushing of persisted state, and the ability to determine current
  // persisted size without closing the stream.
  //
  // The client might specify one or both of the `state_lookup` and `flush`
  // fields in each `BidiWriteObjectRequest`. If `flush` is specified, the data
  // written so far is persisted to storage. If `state_lookup` is specified, the
  // service responds with a `BidiWriteObjectResponse` that contains the
  // persisted size. If both `flush` and `state_lookup` are specified, the flush
  // always occurs before a `state_lookup`, so that both might be set in the
  // same request and the returned state is the state of the object
  // post-flush. When the stream is closed, a `BidiWriteObjectResponse`
  // is always sent to the client, regardless of the value of `state_lookup`.
  rpc BidiWriteObject(stream BidiWriteObjectRequest)
      returns (stream BidiWriteObjectResponse) {}

  // Retrieves a list of objects matching the criteria.
  //
  // **IAM Permissions**:
  //
  // The authenticated user requires `storage.objects.list`
  // IAM permission to use this method. To return object ACLs, the
  // authenticated user must also
  // have the `storage.objects.getIamPolicy` permission.
  rpc ListObjects(ListObjectsRequest) returns (ListObjectsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "parent";
  }

  // Rewrites a source object to a destination object. Optionally overrides
  // metadata.
  rpc RewriteObject(RewriteObjectRequest) returns (RewriteResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "source_bucket" }
      routing_parameters {
        field: "destination_bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Starts a resumable write operation. This
  // method is part of the Resumable
  // upload feature.
  // This allows you to upload large objects in multiple chunks, which is more
  // resilient to network interruptions than a single upload. The validity
  // duration of the write operation, and the consequences of it becoming
  // invalid, are service-dependent.
  //
  // **IAM Permissions**:
  //
  // Requires `storage.objects.create` IAM permission on the bucket.
  rpc StartResumableWrite(StartResumableWriteRequest)
      returns (StartResumableWriteResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "write_object_spec.resource.bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Determines the `persisted_size` of an object that is being written. This
  // method is part of the resumable
  // upload feature.
  // The returned value is the size of the object that has been persisted so
  // far. The value can be used as the `write_offset` for the next `Write()`
  // call.
  //
  // If the object does not exist, meaning if it was deleted, or the
  // first `Write()` has not yet reached the service, this method returns the
  // error `NOT_FOUND`.
  //
  // This method is useful for clients that buffer data and need to know which
  // data can be safely evicted. The client can call `QueryWriteStatus()` at any
  // time to determine how much data has been logged for this object.
  // For any sequence of `QueryWriteStatus()` calls for a given
  // object name, the sequence of returned `persisted_size` values are
  // non-decreasing.
  rpc QueryWriteStatus(QueryWriteStatusRequest)
      returns (QueryWriteStatusResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "upload_id"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "upload_id";
  }

  // Moves the source object to the destination object in the same bucket.
  // This operation moves a source object to a destination object in the
  // same bucket by renaming the object. The move itself is an atomic
  // transaction, ensuring all steps either complete successfully or no
  // changes are made.
  //
  // **IAM Permissions**:
  //
  // Requires the following IAM permissions to use this method:
  //
  //   - `storage.objects.move`
  //   - `storage.objects.create`
  //   - `storage.objects.delete` (only required if overwriting an existing
  //   object)
  rpc MoveObject(MoveObjectRequest) returns (StorageObject) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) =
        "bucket,source_object,destination_object";
  }
}

// Request message for [DeleteBucket][google.storage.v2.Storage.DeleteBucket].
message DeleteBucketRequest {
  // Required. Name of a bucket to delete.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // If set, only deletes the bucket if its metageneration matches this value.
  optional int64 if_metageneration_match = 2;

  // If set, only deletes the bucket if its metageneration does not match this
  // value.
  optional int64 if_metageneration_not_match = 3;
}

// Request message for [GetBucket][google.storage.v2.Storage.GetBucket].
message GetBucketRequest {
  // Required. Name of a bucket.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // If set, only gets the bucket metadata if its metageneration matches this
  // value.
  optional int64 if_metageneration_match = 2;

  // If set, and if the bucket's current metageneration matches the specified
  // value, the request returns an error.
  optional int64 if_metageneration_not_match = 3;

  // Mask specifying which fields to read.
  // A `*` field might be used to indicate all fields.
  // If no mask is specified, it defaults to all fields.
  optional google.protobuf.FieldMask read_mask = 5;
}

// Request message for [CreateBucket][google.storage.v2.Storage.CreateBucket].
message CreateBucketRequest {
  // Required. The project to which this bucket belongs. This field must either
  // be empty or `projects/_`. The project ID that owns this bucket should be
  // specified in the `bucket.project` field.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/Bucket"
    }
  ];

  // Optional. Properties of the new bucket being inserted.
  // The name of the bucket is specified in the `bucket_id` field. Populating
  // `bucket.name` field results in an error.
  // The project of the bucket must be specified in the `bucket.project` field.
  // This field must be in `projects/{projectIdentifier}` format,
  // {projectIdentifier} can be the project ID or project number. The `parent`
  // field must be either empty or `projects/_`.
  Bucket bucket = 2 [(google.api.field_behavior) = OPTIONAL];

  // Required. The ID to use for this bucket, which becomes the final component
  // of the bucket's resource name. For example, the value `foo` might result in
  // a bucket with the name `projects/123456/buckets/foo`.
  string bucket_id = 3 [(google.api.field_behavior) = REQUIRED];

  // Optional. Apply a predefined set of access controls to this bucket.
  // Valid values are `authenticatedRead`, `private`, `projectPrivate`,
  // `publicRead`, or `publicReadWrite`.
  string predefined_acl = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Apply a predefined set of default object access controls to this
  // bucket. Valid values are `authenticatedRead`, `bucketOwnerFullControl`,
  // `bucketOwnerRead`, `private`, `projectPrivate`, or `publicRead`.
  string predefined_default_object_acl = 7
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, enable object retention on the bucket.
  bool enable_object_retention = 9 [(google.api.field_behavior) = OPTIONAL];
}

// Request message for [ListBuckets][google.storage.v2.Storage.ListBuckets].
message ListBucketsRequest {
  // Required. The project whose buckets we are listing.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/Bucket"
    }
  ];

  // Optional. Maximum number of buckets to return in a single response. The
  // service uses this parameter or `1,000` items, whichever is smaller. If
  // `acl` is present in the `read_mask`, the service uses this parameter of
  // `200` items, whichever is smaller.
  int32 page_size = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A previously-returned page token representing part of the larger
  // set of results to view.
  string page_token = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to buckets whose names begin with this prefix.
  string prefix = 4 [(google.api.field_behavior) = OPTIONAL];

  // Mask specifying which fields to read from each result.
  // If no mask is specified, it defaults to all fields except `items.
  // owner`, `items.acl`, and `items.default_object_acl`.
  // `*` might be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 5;

  // Optional. Allows listing of buckets, even if there are buckets that are
  // unreachable.
  bool return_partial_success = 9 [(google.api.field_behavior) = OPTIONAL];
}

// Response message for [ListBuckets][google.storage.v2.Storage.ListBuckets].
message ListBucketsResponse {
  // The list of items.
  repeated Bucket buckets = 1;

  // The continuation token, used to page through large result sets. Provide
  // this value in a subsequent request to return the next page of results.
  string next_page_token = 2;

  // Unreachable resources.
  // This field can only be present if the caller specified
  // return_partial_success to be true in the request to receive indications
  // of temporarily missing resources.
  // unreachable might be:
  // unreachable = [
  //  "projects/_/buckets/bucket1",
  //  "projects/_/buckets/bucket2",
  //  "projects/_/buckets/bucket3",
  // ]
  repeated string unreachable = 3;
}

// Request message for
// [LockBucketRetentionPolicy][google.storage.v2.Storage.LockBucketRetentionPolicy].
message LockBucketRetentionPolicyRequest {
  // Required. Name of a bucket.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Makes the operation conditional on whether bucket's current
  // metageneration matches the given value. Must be positive.
  int64 if_metageneration_match = 2 [(google.api.field_behavior) = REQUIRED];
}

// Request for [UpdateBucket][google.storage.v2.Storage.UpdateBucket] method.
message UpdateBucketRequest {
  // Required. The bucket to update.
  // The bucket's `name` field is used to identify the bucket.
  Bucket bucket = 1 [(google.api.field_behavior) = REQUIRED];

  // If set, the request modifies the bucket if its metageneration matches this
  // value.
  optional int64 if_metageneration_match = 2;

  // If set, the request modifies the bucket if its metageneration doesn't
  // match this value.
  optional int64 if_metageneration_not_match = 3;

  // Optional. Apply a predefined set of access controls to this bucket.
  // Valid values are `authenticatedRead`, `private`, `projectPrivate`,
  // `publicRead`, or `publicReadWrite`.
  string predefined_acl = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Apply a predefined set of default object access controls to this
  // bucket. Valid values are `authenticatedRead`, `bucketOwnerFullControl`,
  // `bucketOwnerRead`, `private`, `projectPrivate`, or `publicRead`.
  string predefined_default_object_acl = 9
      [(google.api.field_behavior) = OPTIONAL];

  // Required. List of fields to be updated.
  //
  // To specify ALL fields, equivalent to the JSON API's "update" function,
  // specify a single field with the value `*`. Note: not recommended. If a new
  // field is introduced at a later time, an older client updating with the `*`
  // might accidentally reset the new field's value.
  //
  // Not specifying any fields is an error.
  google.protobuf.FieldMask update_mask = 6
      [(google.api.field_behavior) = REQUIRED];
}

// Request message for [ComposeObject][google.storage.v2.Storage.ComposeObject].
message ComposeObjectRequest {
  // Description of a source object for a composition request.
  message SourceObject {
    // Preconditions for a source object of a composition request.
    message ObjectPreconditions {
      // Only perform the composition if the generation of the source object
      // that would be used matches this value.  If this value and a generation
      // are both specified, they must be the same value or the call fails.
      optional int64 if_generation_match = 1;
    }

    // Required. The source object's name. All source objects must reside in the
    // same bucket.
    string name = 1 [(google.api.field_behavior) = REQUIRED];

    // Optional. The generation of this object to use as the source.
    int64 generation = 2 [(google.api.field_behavior) = OPTIONAL];

    // Optional. Conditions that must be met for this operation to execute.
    ObjectPreconditions object_preconditions = 3
        [(google.api.field_behavior) = OPTIONAL];
  }

  // Required. Properties of the resulting object.
  StorageObject destination = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. The list of source objects that is concatenated into a single
  // object.
  repeated SourceObject source_objects = 2
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Apply a predefined set of access controls to the destination
  // object. Valid values are `authenticatedRead`, `bucketOwnerFullControl`,
  // `bucketOwnerRead`, `private`, `projectPrivate`, or `publicRead`.
  string destination_predefined_acl = 9
      [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 5;

  // Optional. Resource name of the Cloud KMS key, of the form
  // `projects/my-project/locations/my-location/keyRings/my-kr/cryptoKeys/my-key`,
  // that is used to encrypt the object. Overrides the object
  // metadata's `kms_key_name` value, if any.
  string kms_key = 6 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "cloudkms.googleapis.com/CryptoKey"
    }
  ];

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 7
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The checksums of the complete object. This is validated against
  // the combined checksums of the component objects.
  ObjectChecksums object_checksums = 10
      [(google.api.field_behavior) = OPTIONAL];

  // Whether the source objects should be deleted in the compose request.
  optional bool delete_source_objects = 11;
}

// Request message for deleting an object.
message DeleteObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the finalized object to delete.
  // Note: If you want to delete an unfinalized resumable upload please use
  // `CancelResumableWrite`.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. If present, permanently deletes a specific revision of this
  // object (as opposed to the latest version, the default).
  int64 generation = 4 [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 5;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 7;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 8;

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 10
      [(google.api.field_behavior) = OPTIONAL];
}

// Request message for
// [RestoreObject][google.storage.v2.Storage.RestoreObject].
// `bucket`, `object`, and `generation` **must** be set.
message RestoreObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to restore.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Required. The specific revision of the object to restore.
  int64 generation = 3 [(google.api.field_behavior) = REQUIRED];

  // Optional. Restore token used to differentiate soft-deleted objects with the
  // same name and generation. Only applicable for hierarchical namespace
  // buckets. This parameter is optional, and is only required in the rare case
  // when there are multiple soft-deleted objects with the same name and
  // generation.
  string restore_token = 11 [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 7;

  // If false or unset, the bucket's default object ACL is used.
  // If true, copy the source object's access controls.
  // Return an error if bucket has UBLA enabled.
  optional bool copy_source_acl = 9;

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 8
      [(google.api.field_behavior) = OPTIONAL];
}

// Request message for
// [CancelResumableWrite][google.storage.v2.Storage.CancelResumableWrite].
message CancelResumableWriteRequest {
  // Required. The upload_id of the resumable upload to cancel. This should be
  // copied from the `upload_id` field of `StartResumableWriteResponse`.
  string upload_id = 1 [(google.api.field_behavior) = REQUIRED];
}

// Empty response message for canceling an in-progress resumable upload, is
// extended as needed.
message CancelResumableWriteResponse {}

// Request message for [ReadObject][google.storage.v2.Storage.ReadObject].
message ReadObjectRequest {
  // Required. The name of the bucket containing the object to read.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to read.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. If present, selects a specific revision of this object (as
  // opposed to the latest version, the default).
  int64 generation = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The offset for the first byte to return in the read, relative to
  // the start of the object.
  //
  // A negative `read_offset` value is interpreted as the number of bytes
  // back from the end of the object to be returned. For example, if an object's
  // length is `15` bytes, a `ReadObjectRequest` with `read_offset` = `-5` and
  // `read_limit` = `3` would return bytes `10` through `12` of the object.
  // Requesting a negative offset with magnitude larger than the size of the
  // object returns the entire object.
  int64 read_offset = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The maximum number of `data` bytes the server is allowed to
  // return in the sum of all `StorageObject` messages. A `read_limit` of zero
  // indicates that there is no limit, and a negative `read_limit` causes an
  // error.
  //
  // If the stream returns fewer bytes than allowed by the `read_limit` and no
  // error occurred, the stream includes all data from the `read_offset` to the
  // end of the resource.
  int64 read_limit = 5 [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 6;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 7;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 8;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 9;

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 10
      [(google.api.field_behavior) = OPTIONAL];

  // Mask specifying which fields to read.
  // The `checksummed_data` field and its children are always present.
  // If no mask is specified, it defaults to all fields except `metadata.
  // owner` and `metadata.acl`.
  // `*` might be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 12;
}

// Request message for [GetObject][google.storage.v2.Storage.GetObject].
message GetObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Name of the object.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. If present, selects a specific revision of this object (as
  // opposed to the latest version, the default).
  int64 generation = 3 [(google.api.field_behavior) = OPTIONAL];

  // If true, return the soft-deleted version of this object.
  optional bool soft_deleted = 11;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 7;

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 8
      [(google.api.field_behavior) = OPTIONAL];

  // Mask specifying which fields to read.
  // If no mask is specified, it defaults to all fields except `metadata.
  // acl` and `metadata.owner`.
  // `*` might be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 10;

  // Optional. Restore token used to differentiate soft-deleted objects with the
  // same name and generation. Only applicable for hierarchical namespace
  // buckets and if `soft_deleted` is set to `true`. This parameter is optional,
  // and is only required in the rare case when there are multiple soft-deleted
  // objects with the same `name` and `generation`.
  string restore_token = 12 [(google.api.field_behavior) = OPTIONAL];
}

// Response message for [ReadObject][google.storage.v2.Storage.ReadObject].
message ReadObjectResponse {
  // A portion of the data for the object. The service might leave `data`
  // empty for any given `ReadResponse`. This enables the service to inform the
  // client that the request is still live while it is running an operation to
  // generate more data.
  ChecksummedData checksummed_data = 1;

  // The checksums of the complete object. If the object is downloaded in full,
  // the client should compute one of these checksums over the downloaded object
  // and compare it against the value provided here.
  ObjectChecksums object_checksums = 2;

  // If `read_offset` and or `read_limit` is specified on the
  // `ReadObjectRequest`, `ContentRange` is populated on the first
  // `ReadObjectResponse` message of the read stream.
  ContentRange content_range = 3;

  // Metadata of the object whose media is being returned.
  // Only populated in the first response in the stream.
  StorageObject metadata = 4;
}

// Describes the object to read in a BidiReadObject request.
message BidiReadObjectSpec {
  // Required. The name of the bucket containing the object to read.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to read.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. If present, selects a specific revision of this object (as
  // opposed to the latest version, the default).
  int64 generation = 3 [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 7;

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 8
      [(google.api.field_behavior) = OPTIONAL];

  // Mask specifying which fields to read.
  // The `checksummed_data` field and its children are always present.
  // If no mask is specified, it defaults to all fields except `metadata.
  // owner` and `metadata.acl`.
  // `*` might be used to mean "all fields".
  // As per https://google.aip.dev/161, this field is deprecated.
  // As an alternative, `grpc metadata` can be used:
  optional google.protobuf.FieldMask read_mask = 12 [deprecated = true];

  // The client can optionally set this field. The read handle is an optimized
  // way of creating new streams. Read handles are generated and periodically
  // refreshed from prior reads.
  optional BidiReadHandle read_handle = 13;

  // The routing token that influences request routing for the stream. Must be
  // provided if a BidiReadObjectRedirectedError is returned.
  optional string routing_token = 14;
}

// Request message for
// [BidiReadObject][google.storage.v2.Storage.BidiReadObject].
message BidiReadObjectRequest {
  // Optional. The first message of each stream should set this field. If this
  // is not the first message, an error is returned. Describes the object to
  // read.
  BidiReadObjectSpec read_object_spec = 1
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Provides a list of 0 or more (up to 100) ranges to read. If a
  // single range is large enough to require multiple responses, they are
  // delivered in increasing offset order. There are no ordering guarantees
  // across ranges. When no ranges are provided, the response message
  // doesn't  include `ObjectRangeData`. For full object downloads, the
  // offset and size can be set to `0`.
  repeated ReadRange read_ranges = 8 [(google.api.field_behavior) = OPTIONAL];
}

// Response message for
// [BidiReadObject][google.storage.v2.Storage.BidiReadObject].
message BidiReadObjectResponse {
  // A portion of the object's data. The service might leave data
  // empty for any given `ReadResponse`. This enables the service to inform the
  // client that the request is still live while it is running an operation to
  // generate more data.
  // The service might pipeline multiple responses belonging to different read
  // requests. Each `ObjectRangeData` entry has a `read_id` that is set
  // to the same value as the corresponding source read request.
  repeated ObjectRangeData object_data_ranges = 6;

  // Metadata of the object whose media is being returned.
  // Only populated in the first response in the stream and not populated when
  // the stream is opened with a read handle.
  StorageObject metadata = 4;

  // This field is periodically refreshed, however it might not be set in
  // every response. It allows the client to more efficiently open subsequent
  // bidirectional streams to the same object.
  BidiReadHandle read_handle = 7;
}

// Error proto containing details for a redirected read. This error might be
// attached as details for an ABORTED response to BidiReadObject.
message BidiReadObjectRedirectedError {
  // The read handle for the redirected read. If set, the client might use this
  // in the BidiReadObjectSpec when retrying the read stream.
  BidiReadHandle read_handle = 1;

  // The routing token the client must use when retrying the read stream.
  // This value must be provided in the header `x-goog-request-params`, with key
  // `routing_token` and this string verbatim as the value.
  optional string routing_token = 2;
}

// Error proto containing details for a redirected write. This error might be
// attached as details for an ABORTED response to BidiWriteObject.
message BidiWriteObjectRedirectedError {
  // The routing token the client must use when retrying the write stream.
  // This value must be provided in the header `x-goog-request-params`, with key
  // `routing_token` and this string verbatim as the value.
  optional string routing_token = 1;

  // Opaque value describing a previous write. If set, the client must use this
  // in an AppendObjectSpec first_message when retrying the write stream. If not
  // set, clients might retry the original request.
  optional BidiWriteHandle write_handle = 2;

  // The generation of the object that triggered the redirect. This is set
  // iff `write_handle` is set. If set, the client must use this in an
  // `AppendObjectSpec` first_message when retrying the write stream.
  optional int64 generation = 3;
}

// Error extension proto containing details for all outstanding reads on the
// failed stream
message BidiReadObjectError {
  // The error code for each outstanding read_range
  repeated ReadRangeError read_range_errors = 1;
}

// Error extension proto containing details for a single range read
message ReadRangeError {
  // The id of the corresponding read_range
  int64 read_id = 1;

  // The status which should be an enum value of [google.rpc.Code].
  google.rpc.Status status = 2;
}

// Describes a range of bytes to read in a `BidiReadObjectRanges` request.
message ReadRange {
  // Required. The offset for the first byte to return in the read, relative to
  // the start of the object.
  //
  // A negative read_offset value is interpreted as the number of bytes
  // back from the end of the object to be returned. For example, if an object's
  // length is 15 bytes, a `ReadObjectRequest` with `read_offset` = -5 and
  // `read_length` = 3 would return bytes 10 through 12 of the object.
  // Requesting a negative offset with magnitude larger than the size of the
  // object is equivalent to `read_offset` = 0. A `read_offset` larger than the
  // size of the object results in an `OutOfRange` error.
  int64 read_offset = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. The maximum number of data bytes the server is allowed to return
  // across all response messages with the same `read_id`. A `read_length` of
  // zero indicates to read until the resource end, and a negative `read_length`
  // causes an `OutOfRange` error. If the stream returns fewer bytes than
  // allowed by the `read_length` and no error occurred, the stream includes all
  // data from the `read_offset` to the resource end.
  int64 read_length = 2 [(google.api.field_behavior) = OPTIONAL];

  // Required. Read identifier provided by the client. When the client issues
  // more than one outstanding `ReadRange` on the same stream, responses can be
  // mapped back to their corresponding requests using this value. Clients must
  // ensure that all outstanding requests have different read_id values. The
  // server might close the stream with an error if this condition is not met.
  int64 read_id = 3 [(google.api.field_behavior) = REQUIRED];
}

// Contains data and metadata for a range of an object.
message ObjectRangeData {
  // A portion of the data for the object.
  ChecksummedData checksummed_data = 1;

  // The `ReadRange` describes the content being returned with `read_id` set to
  // the corresponding `ReadObjectRequest` in the stream. Multiple
  // `ObjectRangeData` messages might have the same read_id but increasing
  // offsets. `ReadObjectResponse` messages with the same `read_id` are
  // guaranteed to be delivered in increasing offset order.
  ReadRange read_range = 2;

  // If set, indicates there are no more bytes to read for the given ReadRange.
  bool range_end = 3;
}

// `BidiReadHandle` contains a handle from a previous `BiDiReadObject`
// invocation. The client can use this instead of `BidiReadObjectSpec` as an
// optimized way of opening subsequent bidirectional streams to the same object.
message BidiReadHandle {
  // Required. Opaque value describing a previous read.
  bytes handle = 1 [(google.api.field_behavior) = REQUIRED];
}

// `BidiWriteHandle` contains a handle from a previous `BidiWriteObject`
// invocation. The client can use this instead of `BidiReadObjectSpec` as an
// optimized way of opening subsequent bidirectional streams to the same object.
message BidiWriteHandle {
  // Required. Opaque value describing a previous write.
  bytes handle = 1 [(google.api.field_behavior) = REQUIRED];
}

// Describes an attempt to insert an object, possibly over multiple requests.
message WriteObjectSpec {
  // Required. Destination object, including its name and its metadata.
  StorageObject resource = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. Apply a predefined set of access controls to this object.
  // Valid values are `authenticatedRead`, `bucketOwnerFullControl`,
  // `bucketOwnerRead`, `private`, `projectPrivate`, or `publicRead`.
  string predefined_acl = 7 [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current
  // generation matches the given value. Setting to `0` makes the operation
  // succeed only if there are no live versions of the object.
  optional int64 if_generation_match = 3;

  // Makes the operation conditional on whether the object's live
  // generation does not match the given value. If no live object exists, the
  // precondition fails. Setting to `0` makes the operation succeed only if
  // there is a live version of the object.
  optional int64 if_generation_not_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 6;

  // The expected final object size being uploaded.
  // If this value is set, closing the stream after writing fewer or more than
  // `object_size` bytes results in an `OUT_OF_RANGE` error.
  //
  // This situation is considered a client error, and if such an error occurs
  // you must start the upload over from scratch, this time sending the correct
  // number of bytes.
  optional int64 object_size = 8;

  // If `true`, the object is created in appendable mode.
  // This field might only be set when using `BidiWriteObject`.
  optional bool appendable = 9;
}

// Request message for [WriteObject][google.storage.v2.Storage.WriteObject].
message WriteObjectRequest {
  // The first message of each stream should set one of the following.
  oneof first_message {
    // For resumable uploads. This should be the `upload_id` returned from a
    // call to `StartResumableWriteResponse`.
    string upload_id = 1;

    // For non-resumable uploads. Describes the overall upload, including the
    // destination bucket and object name, preconditions, etc.
    WriteObjectSpec write_object_spec = 2;
  }

  // Required. The offset from the beginning of the object at which the data
  // should be written.
  //
  // In the first `WriteObjectRequest` of a `WriteObject()` action, it
  // indicates the initial offset for the `Write()` call. The value **must** be
  // equal to the `persisted_size` that a call to `QueryWriteStatus()` would
  // return (0 if this is the first write to the object).
  //
  // On subsequent calls, this value **must** be no larger than the sum of the
  // first `write_offset` and the sizes of all `data` chunks sent previously on
  // this stream.
  //
  // An incorrect value causes an error.
  int64 write_offset = 3 [(google.api.field_behavior) = REQUIRED];

  // A portion of the data for the object.
  oneof data {
    // The data to insert. If a crc32c checksum is provided that doesn't match
    // the checksum computed by the service, the request fails.
    ChecksummedData checksummed_data = 4;
  }

  // Optional. Checksums for the complete object. If the checksums computed by
  // the service don't match the specified checksums the call fails. This field
  // might only be provided in the first or last request (either with
  // `first_message`, or `finish_write` set).
  ObjectChecksums object_checksums = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If `true`, this indicates that the write is complete. Sending any
  // `WriteObjectRequest`s subsequent to one in which `finish_write` is `true`
  // causes an error.
  // For a non-resumable write (where the `upload_id` was not set in the first
  // message), it is an error not to set this field in the final message of the
  // stream.
  bool finish_write = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of parameters common to Cloud Storage API requests
  // concerning an object.
  CommonObjectRequestParams common_object_request_params = 8
      [(google.api.field_behavior) = OPTIONAL];
}

// Response message for
// [WriteObject][google.storage.v2.Storage.WriteObject].
message WriteObjectResponse {
  // The response sets one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    StorageObject resource = 2;
  }

  // If persisted_size is set, contains checksums of persisted data.
  ObjectChecksums persisted_data_checksums = 3;
}

// Describes an attempt to append to an object, possibly over multiple requests.
message AppendObjectSpec {
  // Required. The name of the bucket containing the object to write.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to open for writing.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Required. The generation number of the object to open for writing.
  int64 generation = 3 [(google.api.field_behavior) = REQUIRED];

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  //
  // Note that metageneration preconditions are only checked if `write_handle`
  // is empty.
  optional int64 if_metageneration_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  //
  // Note that metageneration preconditions are only checked if `write_handle`
  // is empty.
  optional int64 if_metageneration_not_match = 5;

  // An optional routing token that influences request routing for the stream.
  // Must be provided if a `BidiWriteObjectRedirectedError` is returned.
  optional string routing_token = 6;

  // An optional write handle returned from a previous BidiWriteObjectResponse
  // message or a BidiWriteObjectRedirectedError error.
  //
  // Note that metageneration preconditions are only checked if `write_handle`
  // is empty.
  optional BidiWriteHandle write_handle = 7;
}

// Request message for
// [BidiWriteObject][google.storage.v2.Storage.BidiWriteObject].
message BidiWriteObjectRequest {
  // The first message of each stream should set one of the following.
  oneof first_message {
    // For resumable uploads. This should be the `upload_id` returned from a
    // call to `StartResumableWriteResponse`.
    string upload_id = 1;

    // For non-resumable uploads. Describes the overall upload, including the
    // destination bucket and object name, preconditions, etc.
    WriteObjectSpec write_object_spec = 2;

    // For appendable uploads. Describes the object to append to.
    AppendObjectSpec append_object_spec = 11;
  }

  // Required. The offset from the beginning of the object at which the data
  // should be written.
  //
  // In the first `WriteObjectRequest` of a `WriteObject()` action, it
  // indicates the initial offset for the `Write()` call. The value must be
  // equal to the `persisted_size` that a call to `QueryWriteStatus()` would
  // return (0 if this is the first write to the object).
  //
  // On subsequent calls, this value must be no larger than the sum of the
  // first `write_offset` and the sizes of all `data` chunks sent previously on
  // this stream.
  //
  // An invalid value causes an error.
  int64 write_offset = 3 [(google.api.field_behavior) = REQUIRED];

  // A portion of the data for the object.
  oneof data {
    // The data to insert. If a crc32c checksum is provided that doesn't match
    // the checksum computed by the service, the request fails.
    ChecksummedData checksummed_data = 4;
  }

  // Optional. Checksums for the complete object. If the checksums computed by
  // the service don't match the specified checksums the call fails. May be
  // provided in the last request (with finish_write set). For non-appendable
  // objects only, may also be provided in the first request.
  ObjectChecksums object_checksums = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. For each `BidiWriteObjectRequest` where `state_lookup` is `true`
  // or the client closes the stream, the service sends a
  // `BidiWriteObjectResponse` containing the current persisted size. The
  // persisted size sent in responses covers all the bytes the server has
  // persisted thus far and can be used to decide what data is safe for the
  // client to drop. Note that the object's current size reported by the
  // `BidiWriteObjectResponse` might lag behind the number of bytes written by
  // the client. This field is ignored if `finish_write` is set to true.
  bool state_lookup = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Persists data written on the stream, up to and including the
  // current message, to permanent storage. This option should be used sparingly
  // as it might reduce performance. Ongoing writes are periodically persisted
  // on the server even when `flush` is not set. This field is ignored if
  // `finish_write` is set to true since there's no need to checkpoint or flush
  // if this message completes the write.
  bool flush = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If `true`, this indicates that the write is complete. Sending any
  // `WriteObjectRequest`s subsequent to one in which `finish_write` is `true`
  // causes an error.
  // For a non-resumable write (where the `upload_id` was not set in the first
  // message), it is an error not to set this field in the final message of the
  // stream.
  bool finish_write = 9 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 10
      [(google.api.field_behavior) = OPTIONAL];
}

// Response message for BidiWriteObject.
message BidiWriteObjectResponse {
  // The response sets one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    StorageObject resource = 2;
  }

  // If persisted_size is set, contains checksums of persisted data.
  ObjectChecksums persisted_data_checksums = 4;

  // An optional write handle that is returned periodically in response
  // messages. Clients should save it for later use in establishing a new stream
  // if a connection is interrupted.
  optional BidiWriteHandle write_handle = 3;
}

// Request message for [ListObjects][google.storage.v2.Storage.ListObjects].
message ListObjectsRequest {
  // Required. Name of the bucket in which to look for objects.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Optional. Maximum number of `items` plus `prefixes` to return
  // in a single page of responses. As duplicate `prefixes` are
  // omitted, fewer total results might be returned than requested. The service
  // uses this parameter or 1,000 items, whichever is smaller.
  int32 page_size = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A previously-returned page token representing part of the larger
  // set of results to view.
  string page_token = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If set, returns results in a directory-like mode. `items`
  // contains only objects whose names, aside from the `prefix`, do not contain
  // `delimiter`. Objects whose names, aside from the `prefix`, contain
  // `delimiter` has their name, truncated after the `delimiter`, returned in
  // `prefixes`. Duplicate `prefixes` are omitted.
  string delimiter = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, objects that end in exactly one instance of `delimiter`
  // has their metadata included in `items` in addition to
  // `prefixes`.
  bool include_trailing_delimiter = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to objects whose names begin with this prefix.
  string prefix = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If `true`, lists all versions of an object as distinct results.
  bool versions = 7 [(google.api.field_behavior) = OPTIONAL];

  // Mask specifying which fields to read from each result.
  // If no mask is specified, defaults to all fields except `items.acl` and
  // `items.owner`.
  // `*` might be used to mean all fields.
  optional google.protobuf.FieldMask read_mask = 8;

  // Optional. Filter results to objects whose names are lexicographically equal
  // to or after `lexicographic_start`. If `lexicographic_end` is also set, the
  // objects listed have names between `lexicographic_start` (inclusive) and
  // `lexicographic_end` (exclusive).
  string lexicographic_start = 10 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to objects whose names are lexicographically
  // before `lexicographic_end`. If `lexicographic_start` is also set, the
  // objects listed have names between `lexicographic_start` (inclusive) and
  // `lexicographic_end` (exclusive).
  string lexicographic_end = 11 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, only list all soft-deleted versions of the object.
  // Soft delete policy is required to set this option.
  bool soft_deleted = 12 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, includes folders and managed folders (besides objects)
  // in the returned `prefixes`. Requires `delimiter` to be set to '/'.
  bool include_folders_as_prefixes = 13
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to objects and prefixes that match this glob
  // pattern. See [List objects using
  // glob](https://cloud.google.com/storage/docs/json_api/v1/objects/list#list-objects-and-prefixes-using-glob)
  // for the full syntax.
  string match_glob = 14 [(google.api.field_behavior) = OPTIONAL];

  // Optional. An expression used to filter the returned objects by the
  // `context` field. For the full syntax, see [Filter objects by contexts
  // syntax](https://cloud.google.com/storage/docs/listing-objects#filter-by-object-contexts-syntax).
  // If a `delimiter` is set, the returned `prefixes` are exempt from this
  // filter.
  string filter = 15 [(google.api.field_behavior) = OPTIONAL];
}

// Request object for
// [QueryWriteStatus][google.storage.v2.Storage.QueryWriteStatus].
message QueryWriteStatusRequest {
  // Required. The name of the resume token for the object whose write status is
  // being requested.
  string upload_id = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 2
      [(google.api.field_behavior) = OPTIONAL];
}

// Response object for
// [QueryWriteStatus][google.storage.v2.Storage.QueryWriteStatus].
message QueryWriteStatusResponse {
  // The response sets one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. This is the correct value for the
    // 'write_offset' field to use when resuming the `WriteObject` operation.
    // Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    StorageObject resource = 2;
  }

  // If persisted_size is set, contains checksums of persisted data.
  ObjectChecksums persisted_data_checksums = 3;
}

// Request message for [RewriteObject][google.storage.v2.Storage.RewriteObject].
// If the source object is encrypted using a Customer-Supplied Encryption Key
// the key information must be provided in the
// `copy_source_encryption_algorithm`, `copy_source_encryption_key_bytes`, and
// `copy_source_encryption_key_sha256_bytes` fields. If the destination object
// should be encrypted the keying information should be provided in the
// `encryption_algorithm`, `encryption_key_bytes`, and
// `encryption_key_sha256_bytes` fields of the
// `common_object_request_params.customer_encryption` field.
message RewriteObjectRequest {
  // Required. Immutable. The name of the destination object.
  // See the
  // [Naming Guidelines](https://cloud.google.com/storage/docs/objects#naming).
  // Example: `test.txt`
  // The `name` field by itself does not uniquely identify a Cloud Storage
  // object. A Cloud Storage object is uniquely identified by the tuple of
  // (bucket, object, generation).
  string destination_name = 24 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Required. Immutable. The name of the bucket containing the destination
  // object.
  string destination_bucket = 25 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Optional. The name of the Cloud KMS key that is used to encrypt the
  // destination object. The Cloud KMS key must be located in same location as
  // the object. If the parameter is not specified, the request uses the
  // destination bucket's default encryption key, if any, or else the
  // Google-managed encryption key.
  string destination_kms_key = 27 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "cloudkms.googleapis.com/CryptoKey"
    }
  ];

  // Optional. Properties of the destination, post-rewrite object.
  // The `name`, `bucket` and `kms_key` fields must not be populated (these
  // values are specified in the `destination_name`, `destination_bucket`, and
  // `destination_kms_key` fields).
  // If `destination` is present it is used to construct the destination
  // object's metadata; otherwise the destination object's metadata is
  // copied from the source object.
  StorageObject destination = 1 [(google.api.field_behavior) = OPTIONAL];

  // Required. Name of the bucket in which to find the source object.
  string source_bucket = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Name of the source object.
  string source_object = 3 [(google.api.field_behavior) = REQUIRED];

  // Optional. If present, selects a specific revision of the source object (as
  // opposed to the latest version, the default).
  int64 source_generation = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Include this field (from the previous rewrite response) on each
  // rewrite request after the first one, until the rewrite response 'done' flag
  // is true. Calls that provide a rewriteToken can omit all other request
  // fields, but if included those fields must match the values provided in the
  // first rewrite request.
  string rewrite_token = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Apply a predefined set of access controls to the destination
  // object. Valid values are `authenticatedRead`, `bucketOwnerFullControl`,
  // `bucketOwnerRead`, `private`, `projectPrivate`, or `publicRead`.
  string destination_predefined_acl = 28
      [(google.api.field_behavior) = OPTIONAL];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 7;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 8;

  // Makes the operation conditional on whether the destination object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 9;

  // Makes the operation conditional on whether the destination object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 10;

  // Makes the operation conditional on whether the source object's live
  // generation matches the given value.
  optional int64 if_source_generation_match = 11;

  // Makes the operation conditional on whether the source object's live
  // generation does not match the given value.
  optional int64 if_source_generation_not_match = 12;

  // Makes the operation conditional on whether the source object's current
  // metageneration matches the given value.
  optional int64 if_source_metageneration_match = 13;

  // Makes the operation conditional on whether the source object's current
  // metageneration does not match the given value.
  optional int64 if_source_metageneration_not_match = 14;

  // Optional. The maximum number of bytes that are rewritten per rewrite
  // request. Most callers shouldn't need to specify this parameter - it is
  // primarily in place to support testing. If specified the value must be an
  // integral multiple of 1 MiB (1048576). Also, this only applies to requests
  // where the source and destination span locations and/or storage classes.
  // Finally, this value must not change across rewrite calls else you'll get an
  // error that the `rewriteToken` is invalid.
  int64 max_bytes_rewritten_per_call = 15
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The algorithm used to encrypt the source object, if any. Used if
  // the source object was encrypted with a Customer-Supplied Encryption Key.
  string copy_source_encryption_algorithm = 16
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The raw bytes (not base64-encoded) AES-256 encryption key used to
  // encrypt the source object, if it was encrypted with a Customer-Supplied
  // Encryption Key.
  bytes copy_source_encryption_key_bytes = 21
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The raw bytes (not base64-encoded) SHA256 hash of the encryption
  // key used to encrypt the source object, if it was encrypted with a
  // Customer-Supplied Encryption Key.
  bytes copy_source_encryption_key_sha256_bytes = 22
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 19
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The checksums of the complete object. This is used to validate
  // the destination object after rewriting.
  ObjectChecksums object_checksums = 29
      [(google.api.field_behavior) = OPTIONAL];
}

// A rewrite response.
message RewriteResponse {
  // The total bytes written so far, which can be used to provide a waiting user
  // with a progress indicator. This property is always present in the response.
  int64 total_bytes_rewritten = 1;

  // The total size of the object being copied in bytes. This property is always
  // present in the response.
  int64 object_size = 2;

  // `true` if the copy is finished; otherwise, `false` if
  // the copy is in progress. This property is always present in the response.
  bool done = 3;

  // A token to use in subsequent requests to continue copying data. This token
  // is present in the response only when there is more data to copy.
  string rewrite_token = 4;

  // A resource containing the metadata for the copied-to object. This property
  // is present in the response only when copying completes.
  StorageObject resource = 5;
}

// Request message for [MoveObject][google.storage.v2.Storage.MoveObject].
message MoveObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Name of the source object.
  string source_object = 2 [(google.api.field_behavior) = REQUIRED];

  // Required. Name of the destination object.
  string destination_object = 3 [(google.api.field_behavior) = REQUIRED];

  // Optional. Makes the operation conditional on whether the source object's
  // current generation matches the given value. `if_source_generation_match`
  // and `if_source_generation_not_match` conditions are mutually exclusive:
  // it's an error for both of them to be set in the request.
  optional int64 if_source_generation_match = 4
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the source object's
  // current generation does not match the given value.
  // `if_source_generation_match` and `if_source_generation_not_match`
  // conditions are mutually exclusive: it's an error for both of them to be set
  // in the request.
  optional int64 if_source_generation_not_match = 5
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the source object's
  // current metageneration matches the given value.
  // `if_source_metageneration_match` and `if_source_metageneration_not_match`
  // conditions are mutually exclusive: it's an error for both of them to be set
  // in the request.
  optional int64 if_source_metageneration_match = 6
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the source object's
  // current metageneration does not match the given value.
  // `if_source_metageneration_match` and `if_source_metageneration_not_match`
  // conditions are mutually exclusive: it's an error for both of them to be set
  // in the request.
  optional int64 if_source_metageneration_not_match = 7
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the destination
  // object's current generation matches the given value. Setting to 0 makes the
  // operation succeed only if there are no live versions of the object.
  // `if_generation_match` and `if_generation_not_match` conditions are mutually
  // exclusive: it's an error for both of them to be set in the request.
  optional int64 if_generation_match = 8
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the destination
  // object's current generation does not match the given value. If no live
  // object exists, the precondition fails. Setting to 0 makes the operation
  // succeed only if there is a live version of the object.
  // `if_generation_match` and `if_generation_not_match` conditions are mutually
  // exclusive: it's an error for both of them to be set in the request.
  optional int64 if_generation_not_match = 9
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the destination
  // object's current metageneration matches the given value.
  // `if_metageneration_match` and `if_metageneration_not_match` conditions are
  // mutually exclusive: it's an error for both of them to be set in the
  // request.
  optional int64 if_metageneration_match = 10
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Makes the operation conditional on whether the destination
  // object's current metageneration does not match the given value.
  // `if_metageneration_match` and `if_metageneration_not_match` conditions are
  // mutually exclusive: it's an error for both of them to be set in the
  // request.
  optional int64 if_metageneration_not_match = 11
      [(google.api.field_behavior) = OPTIONAL];
}

// Request message for
// [StartResumableWrite][google.storage.v2.Storage.StartResumableWrite].
message StartResumableWriteRequest {
  // Required. Contains the information necessary to start a resumable write.
  WriteObjectSpec write_object_spec = 1
      [(google.api.field_behavior) = REQUIRED];

  // Optional. A set of parameters common to Storage API requests related to an
  // object.
  CommonObjectRequestParams common_object_request_params = 3
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The checksums of the complete object. This is used to validate
  // the uploaded object. For each upload, `object_checksums` can be provided
  // when initiating a resumable upload with`StartResumableWriteRequest` or when
  // completing a write with `WriteObjectRequest` with
  // `finish_write` set to `true`.
  ObjectChecksums object_checksums = 5 [(google.api.field_behavior) = OPTIONAL];
}

// Response object for
// [StartResumableWrite][google.storage.v2.Storage.StartResumableWrite].
message StartResumableWriteResponse {
  // A unique identifier for the initiated resumable write operation.
  // As the ID grants write access, you should keep it confidential during
  // the upload to prevent unauthorized access and data tampering during your
  // upload. This ID should be included in subsequent `WriteObject` requests to
  // upload the object data.
  string upload_id = 1;
}

// Request message for [UpdateObject][google.storage.v2.Storage.UpdateObject].
message UpdateObjectRequest {
  // Required. The object to update.
  // The object's bucket and name fields are used to identify the object to
  // update. If present, the object's generation field selects a specific
  // revision of this object whose metadata should be updated. Otherwise,
  // assumes the live version of the object.
  StorageObject object = 1 [(google.api.field_behavior) = REQUIRED];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 2;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 3;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 5;

  // Optional. Apply a predefined set of access controls to this object.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string predefined_acl = 10 [(google.api.field_behavior) = OPTIONAL];

  // Required. List of fields to be updated.
  //
  // To specify ALL fields, equivalent to the JSON API's "update" function,
  // specify a single field with the value `*`. Note: not recommended. If a new
  // field is introduced at a later time, an older client updating with the `*`
  // might accidentally reset the new field's value.
  //
  // Not specifying any fields is an error.
  google.protobuf.FieldMask update_mask = 7
      [(google.api.field_behavior) = REQUIRED];

  // Optional. A set of parameters common to Storage API requests concerning an
  // object.
  CommonObjectRequestParams common_object_request_params = 8
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Overrides the unlocked retention config on the object.
  bool override_unlocked_retention = 11
      [(google.api.field_behavior) = OPTIONAL];
}

// Parameters that can be passed to any object request.
message CommonObjectRequestParams {
  // Optional. Encryption algorithm used with the Customer-Supplied Encryption
  // Keys feature.
  string encryption_algorithm = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Encryption key used with the Customer-Supplied Encryption Keys
  // feature. In raw bytes format (not base64-encoded).
  bytes encryption_key_bytes = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. SHA256 hash of encryption key used with the Customer-supplied
  // encryption keys feature.
  bytes encryption_key_sha256_bytes = 5
      [(google.api.field_behavior) = OPTIONAL];
}

// Shared constants.
message ServiceConstants {
  // A collection of constant values meaningful to the Storage API.
  enum Values {
    option allow_alias = true;

    // Unused. Proto3 requires first enum to be 0.
    VALUES_UNSPECIFIED = 0;

    // The maximum size chunk that can be returned in a single
    // `ReadRequest`.
    // 2 MiB.
    MAX_READ_CHUNK_BYTES = 2097152;

    // The maximum size chunk that can be sent in a single WriteObjectRequest.
    // 2 MiB.
    MAX_WRITE_CHUNK_BYTES = 2097152;

    // The maximum size of an object in MB - whether written in a single stream
    // or composed from multiple other objects.
    // 5 TiB.
    MAX_OBJECT_SIZE_MB = 5242880;

    // The maximum length field name that can be sent in a single
    // custom metadata field.
    // 1 KiB.
    MAX_CUSTOM_METADATA_FIELD_NAME_BYTES = 1024;

    // The maximum length field value that can be sent in a single
    // custom_metadata field.
    // 4 KiB.
    MAX_CUSTOM_METADATA_FIELD_VALUE_BYTES = 4096;

    // The maximum total bytes that can be populated into all field names and
    // values of the custom_metadata for one object.
    // 8 KiB.
    MAX_CUSTOM_METADATA_TOTAL_SIZE_BYTES = 8192;

    // The maximum total bytes that can be populated into all bucket metadata
    // fields.
    // 20 KiB.
    MAX_BUCKET_METADATA_TOTAL_SIZE_BYTES = 20480;

    // The maximum number of NotificationConfigs that can be registered
    // for a given bucket.
    MAX_NOTIFICATION_CONFIGS_PER_BUCKET = 100;

    // The maximum number of LifecycleRules that can be registered for a given
    // bucket.
    MAX_LIFECYCLE_RULES_PER_BUCKET = 100;

    // The maximum number of custom attributes per NotificationConfigs.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTES = 5;

    // The maximum length of a custom attribute key included in
    // NotificationConfig.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTE_KEY_LENGTH = 256;

    // The maximum length of a custom attribute value included in a
    // NotificationConfig.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTE_VALUE_LENGTH = 1024;

    // The maximum number of key/value entries per bucket label.
    MAX_LABELS_ENTRIES_COUNT = 64;

    // The maximum character length of the key or value in a bucket
    // label map.
    MAX_LABELS_KEY_VALUE_LENGTH = 63;

    // The maximum byte size of the key or value in a bucket label
    // map.
    MAX_LABELS_KEY_VALUE_BYTES = 128;

    // The maximum number of object IDs that can be included in a
    // DeleteObjectsRequest.
    MAX_OBJECT_IDS_PER_DELETE_OBJECTS_REQUEST = 1000;

    // The maximum number of days for which a token returned by the
    // GetListObjectsSplitPoints RPC is valid.
    SPLIT_TOKEN_MAX_VALID_DAYS = 14;
  }
}

// A bucket.
message Bucket {
  option (google.api.resource) = {
    type: "storage.googleapis.com/Bucket"
    pattern: "projects/{project}/buckets/{bucket}"
    plural: "buckets"
    singular: "bucket"
  };

  // Billing properties of a bucket.
  message Billing {
    // Optional. When set to true, Requester Pays is enabled for this bucket.
    bool requester_pays = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Cross-Origin Response sharing (CORS) properties for a bucket.
  // For more on Cloud Storage and CORS, see
  // https://cloud.google.com/storage/docs/cross-origin.
  // For more on CORS in general, see https://tools.ietf.org/html/rfc6454.
  message Cors {
    // Optional. The list of origins eligible to receive CORS response headers.
    // For more information about origins, see [RFC
    // 6454](https://tools.ietf.org/html/rfc6454). Note: `*` is permitted in the
    // list of origins, and means `any origin`.
    repeated string origin = 1 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The list of HTTP methods on which to include CORS response
    // headers,
    // (`GET`, `OPTIONS`, `POST`, etc) Note: `*` is permitted in the list of
    // methods, and means "any method".
    repeated string method = 2 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The list of HTTP headers other than the [simple response
    // headers](https://www.w3.org/TR/cors/#simple-response-headers) to give
    // permission for the user-agent to share across domains.
    repeated string response_header = 3
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. The value, in seconds, to return in the [Access-Control-Max-Age
    // header](https://www.w3.org/TR/cors/#access-control-max-age-response-header)
    // used in preflight responses.
    int32 max_age_seconds = 4 [(google.api.field_behavior) = OPTIONAL];
  }

  // Encryption properties of a bucket.
  message Encryption {
    // Google Managed Encryption (GMEK) enforcement config of a bucket.
    message GoogleManagedEncryptionEnforcementConfig {
      // Restriction mode for google-managed encryption for new objects within
      // the bucket. Valid values are: `NotRestricted` and `FullyRestricted`.
      // If `NotRestricted` or unset, creation of new objects with
      // google-managed encryption is allowed.
      // If `FullyRestricted`, new objects can't be created using google-managed
      // encryption.
      optional string restriction_mode = 3;

      // Time from which the config was effective. This is service-provided.
      optional google.protobuf.Timestamp effective_time = 2;
    }

    // Customer Managed Encryption (CMEK) enforcement config of a bucket.
    message CustomerManagedEncryptionEnforcementConfig {
      // Restriction mode for customer-managed encryption for new objects within
      // the bucket. Valid values are: `NotRestricted` and `FullyRestricted`.
      // If `NotRestricted` or unset, creation of new objects with
      // customer-managed encryption is allowed.
      // If `FullyRestricted`, new objects can't be created using
      // customer-managed encryption.
      optional string restriction_mode = 3;

      // Time from which the config was effective. This is service-provided.
      optional google.protobuf.Timestamp effective_time = 2;
    }

    // Customer Supplied Encryption (CSEK) enforcement config of a bucket.
    message CustomerSuppliedEncryptionEnforcementConfig {
      // Restriction mode for customer-supplied encryption for new objects
      // within the bucket. Valid values are: `NotRestricted` and
      // `FullyRestricted`.
      // If `NotRestricted` or unset, creation of new objects with
      // customer-supplied encryption is allowed.
      // If `FullyRestricted`, new objects can't be created using
      // customer-supplied encryption.
      optional string restriction_mode = 3;

      // Time from which the config was effective. This is service-provided.
      optional google.protobuf.Timestamp effective_time = 2;
    }

    // Optional. The name of the Cloud KMS key that is used to encrypt objects
    // inserted into this bucket, if no encryption method is specified.
    string default_kms_key = 1 [
      (google.api.field_behavior) = OPTIONAL,
      (google.api.resource_reference) = {
        type: "cloudkms.googleapis.com/CryptoKey"
      }
    ];

    // Optional. If omitted, then new objects with GMEK encryption-type is
    // allowed. If set, then new objects created in this bucket must comply with
    // enforcement config. Changing this has no effect on existing objects; it
    // applies to new objects only.
    optional GoogleManagedEncryptionEnforcementConfig
        google_managed_encryption_enforcement_config = 2
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. If omitted, then new objects with CMEK encryption-type is
    // allowed. If set, then new objects created in this bucket must comply with
    // enforcement config. Changing this has no effect on existing objects; it
    // applies to new objects only.
    optional CustomerManagedEncryptionEnforcementConfig
        customer_managed_encryption_enforcement_config = 3
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. If omitted, then new objects with CSEK encryption-type is
    // allowed. If set, then new objects created in this bucket must comply with
    // enforcement config. Changing this has no effect on existing objects; it
    // applies to new objects only.
    optional CustomerSuppliedEncryptionEnforcementConfig
        customer_supplied_encryption_enforcement_config = 4
        [(google.api.field_behavior) = OPTIONAL];
  }

  // Bucket restriction options.
  message IamConfig {
    // Settings for Uniform Bucket level access.
    // See https://cloud.google.com/storage/docs/uniform-bucket-level-access.
    message UniformBucketLevelAccess {
      // Optional. If set, access checks only use bucket-level IAM policies or
      // above.
      bool enabled = 1 [(google.api.field_behavior) = OPTIONAL];

      // Optional. The deadline time for changing
      // `iam_config.uniform_bucket_level_access.enabled` from `true` to
      // `false`. Mutable until the specified deadline is reached, but not
      // afterward.
      google.protobuf.Timestamp lock_time = 2
          [(google.api.field_behavior) = OPTIONAL];
    }

    // Optional. Bucket restriction options currently enforced on the bucket.
    UniformBucketLevelAccess uniform_bucket_level_access = 1
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. Whether IAM enforces public access prevention. Valid values are
    // `enforced` or `inherited`.
    string public_access_prevention = 3
        [(google.api.field_behavior) = OPTIONAL];
  }

  // Lifecycle properties of a bucket.
  // For more information, see [StorageObject Lifecycle
  // Management](https://cloud.google.com/storage/docs/lifecycle).
  message Lifecycle {
    // A lifecycle Rule, combining an action to take on an object and a
    // condition which triggers that action.
    message Rule {
      // An action to take on an object.
      message Action {
        // Optional. Type of the action. Currently, only `Delete`,
        // `SetStorageClass`, and `AbortIncompleteMultipartUpload` are
        // supported.
        string type = 1 [(google.api.field_behavior) = OPTIONAL];

        // Optional. Target storage class. Required iff the type of the action
        // is SetStorageClass.
        string storage_class = 2 [(google.api.field_behavior) = OPTIONAL];
      }

      // A condition of an object which triggers some action.
      message Condition {
        // Age of an object (in days). This condition is satisfied when an
        // object reaches the specified age.
        // A value of 0 indicates that all objects immediately match this
        // condition.
        optional int32 age_days = 1;

        // Optional. This condition is satisfied when an object is created
        // before midnight of the specified date in UTC.
        google.type.Date created_before = 2
            [(google.api.field_behavior) = OPTIONAL];

        // Relevant only for versioned objects. If the value is
        // `true`, this condition matches live objects; if the value
        // is `false`, it matches archived objects.
        optional bool is_live = 3;

        // Relevant only for versioned objects. If the value is N, this
        // condition is satisfied when there are at least N versions (including
        // the live version) newer than this version of the object.
        optional int32 num_newer_versions = 4;

        // Optional. Objects having any of the storage classes specified by this
        // condition are matched. Values include `MULTI_REGIONAL`, `REGIONAL`,
        // `NEARLINE`, `COLDLINE`, `STANDARD`, and
        // `DURABLE_REDUCED_AVAILABILITY`.
        repeated string matches_storage_class = 5
            [(google.api.field_behavior) = OPTIONAL];

        // Number of days that have elapsed since the custom timestamp set on an
        // object.
        // The value of the field must be a nonnegative integer.
        optional int32 days_since_custom_time = 7;

        // Optional. An object matches this condition if the custom timestamp
        // set on the object is before the specified date in UTC.
        google.type.Date custom_time_before = 8
            [(google.api.field_behavior) = OPTIONAL];

        // This condition is relevant only for versioned objects. An object
        // version satisfies this condition only if these many days have been
        // passed since it became noncurrent. The value of the field must be a
        // nonnegative integer. If it's zero, the object version becomes
        // eligible for Lifecycle action as soon as it becomes noncurrent.
        optional int32 days_since_noncurrent_time = 9;

        // Optional. This condition is relevant only for versioned objects. An
        // object version satisfies this condition only if it became noncurrent
        // before the specified date in UTC.
        google.type.Date noncurrent_time_before = 10
            [(google.api.field_behavior) = OPTIONAL];

        // Optional. List of object name prefixes. If any prefix exactly matches
        // the beginning of the object name, the condition evaluates to true.
        repeated string matches_prefix = 11
            [(google.api.field_behavior) = OPTIONAL];

        // Optional. List of object name suffixes. If any suffix exactly matches
        // the end of the object name, the condition evaluates to true.
        repeated string matches_suffix = 12
            [(google.api.field_behavior) = OPTIONAL];
      }

      // Optional. The action to take.
      Action action = 1 [(google.api.field_behavior) = OPTIONAL];

      // Optional. The condition under which the action is taken.
      Condition condition = 2 [(google.api.field_behavior) = OPTIONAL];
    }

    // Optional. A lifecycle management rule, which is made of an action to take
    // and the condition under which the action is taken.
    repeated Rule rule = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Logging-related properties of a bucket.
  message Logging {
    // Optional. The destination bucket where the current bucket's logs should
    // be placed, using path format (like `projects/123456/buckets/foo`).
    string log_bucket = 1 [(google.api.field_behavior) = OPTIONAL];

    // Optional. A prefix for log object names.
    string log_object_prefix = 2 [(google.api.field_behavior) = OPTIONAL];
  }

  // StorageObject Retention related properties of a bucket.
  message ObjectRetention {
    // Optional. Output only. If true, object retention is enabled for the
    // bucket.
    bool enabled = 1 [
      (google.api.field_behavior) = OPTIONAL,
      (google.api.field_behavior) = OUTPUT_ONLY
    ];
  }

  // Retention policy properties of a bucket.
  message RetentionPolicy {
    // Optional. Server-determined value that indicates the time from which
    // policy was enforced and effective.
    google.protobuf.Timestamp effective_time = 1
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. Once locked, an object retention policy cannot be modified.
    bool is_locked = 2 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The duration that objects need to be retained. Retention
    // duration must be greater than zero and less than 100 years. Note that
    // enforcement of retention periods less than a day is not guaranteed. Such
    // periods should only be used for testing purposes. Any `nanos` value
    // specified is rounded down to the nearest second.
    google.protobuf.Duration retention_duration = 4
        [(google.api.field_behavior) = OPTIONAL];
  }

  // Soft delete policy properties of a bucket.
  message SoftDeletePolicy {
    // The period of time that soft-deleted objects in the bucket must be
    // retained and cannot be permanently deleted. The duration must be greater
    // than or equal to 7 days and less than 1 year.
    optional google.protobuf.Duration retention_duration = 1;

    // Time from which the policy was effective. This is service-provided.
    optional google.protobuf.Timestamp effective_time = 2;
  }

  // Properties of a bucket related to versioning.
  // For more information about Cloud Storage versioning, see [StorageObject
  // versioning](https://cloud.google.com/storage/docs/object-versioning).
  message Versioning {
    // Optional. While set to true, versioning is fully enabled for this bucket.
    bool enabled = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Properties of a bucket related to accessing the contents as a static
  // website. For details, see [hosting a static website using Cloud
  // Storage](https://cloud.google.com/storage/docs/hosting-static-website).
  message Website {
    // Optional. If the requested object path is missing, the service ensures
    // the path has a trailing '/', append this suffix, and attempt to retrieve
    // the resulting object. This allows the creation of `index.html` objects to
    // represent directory pages.
    string main_page_suffix = 1 [(google.api.field_behavior) = OPTIONAL];

    // Optional. If the requested object path is missing, and any
    // `mainPageSuffix` object is missing, if applicable, the service
    // returns the named object from this bucket as the content for a
    // [404 Not Found](https://tools.ietf.org/html/rfc7231#section-6.5.4)
    // result.
    string not_found_page = 2 [(google.api.field_behavior) = OPTIONAL];
  }

  // Configuration for [configurable dual-
  // regions](https://cloud.google.com/storage/docs/locations#configurable). It
  // should specify precisely two eligible regions within the same multi-region.
  // For details, see
  // [locations](https://cloud.google.com/storage/docs/locations).
  message CustomPlacementConfig {
    // Optional. List of locations to use for data placement.
    repeated string data_locations = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Configuration for a bucket's Autoclass feature.
  message Autoclass {
    // Optional. Enables Autoclass.
    bool enabled = 1 [(google.api.field_behavior) = OPTIONAL];

    // Output only. Latest instant at which the `enabled` field was set to true
    // after being disabled/unconfigured or set to false after being enabled. If
    // Autoclass is enabled when the bucket is created, the value of the
    // `toggle_time` field is set to the bucket `create_time`.
    google.protobuf.Timestamp toggle_time = 2
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // An object in an Autoclass bucket eventually cools down to the
    // terminal storage class if there is no access to the object.
    // The only valid values are NEARLINE and ARCHIVE.
    optional string terminal_storage_class = 3;

    // Output only. Latest instant at which the autoclass terminal storage class
    // was updated.
    optional google.protobuf.Timestamp terminal_storage_class_update_time = 4
        [(google.api.field_behavior) = OUTPUT_ONLY];
  }

  // The [bucket IP
  // filtering](https://cloud.google.com/storage/docs/ip-filtering-overview)
  // configuration. Specifies the network sources that can access the bucket, as
  // well as its underlying objects.
  message IpFilter {
    // The public network IP address ranges that can access the bucket and its
    // data.
    message PublicNetworkSource {
      // Optional. The list of IPv4 and IPv6 cidr blocks that are allowed to
      // operate or access the bucket and its underlying objects.
      repeated string allowed_ip_cidr_ranges = 1
          [(google.api.field_behavior) = OPTIONAL];
    }

    // The list of VPC networks that can access the bucket.
    message VpcNetworkSource {
      // Name of the network.
      //
      // Format: `projects/PROJECT_ID/global/networks/NETWORK_NAME`
      optional string network = 1;

      // Optional. The list of public or private IPv4 and IPv6 CIDR ranges that
      // can access the bucket. In the CIDR IP address block, the specified IP
      // address must be properly truncated, meaning all the host bits must be
      // zero or else the input is considered malformed. For example,
      // `192.0.2.0/24` is accepted but `192.0.2.1/24` is not. Similarly, for
      // IPv6, `2001:db8::/32` is accepted whereas `2001:db8::1/32` is not.
      repeated string allowed_ip_cidr_ranges = 2
          [(google.api.field_behavior) = OPTIONAL];
    }

    // The state of the IP filter configuration. Valid values are `Enabled` and
    // `Disabled`. When set to `Enabled`, IP filtering rules are applied to a
    // bucket and all incoming requests to the bucket are evaluated against
    // these rules. When set to `Disabled`, IP filtering rules are not applied
    // to a bucket.
    optional string mode = 1;

    // Public IPs allowed to operate or access the bucket.
    optional PublicNetworkSource public_network_source = 2;

    // Optional. The list of network sources that are allowed to access
    // operations on the bucket or the underlying objects.
    repeated VpcNetworkSource vpc_network_sources = 3
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. Whether or not to allow VPCs from orgs different than the
    // bucket's parent org to access the bucket. When set to true, validations
    // on the existence of the VPCs won't be performed. If set to false, each
    // VPC network source is checked to belong to the same org as the bucket as
    // well as validated for existence.
    bool allow_cross_org_vpcs = 4 [(google.api.field_behavior) = OPTIONAL];

    // Whether or not to allow all P4SA access to the bucket. When set to true,
    // IP filter config validation doesn't apply.
    optional bool allow_all_service_agent_access = 5;
  }

  // Configuration for a bucket's hierarchical namespace feature.
  message HierarchicalNamespace {
    // Optional. Enables the hierarchical namespace feature.
    bool enabled = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Identifier. The name of the bucket.
  // Format: `projects/{project}/buckets/{bucket}`
  string name = 1 [(google.api.field_behavior) = IDENTIFIER];

  // Output only. The user-chosen part of the bucket name. The `{bucket}`
  // portion of the `name` field. For globally unique buckets, this is equal to
  // the `bucket name` of other Cloud Storage APIs. Example: `pub`.
  string bucket_id = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The etag of the bucket.
  // If included in the metadata of an `UpdateBucketRequest`, the operation is
  // only performed if the `etag` matches that of the bucket.
  string etag = 29;

  // Immutable. The project which owns this bucket, in the format of
  // `projects/{projectIdentifier}`.
  // `{projectIdentifier}` can be the project ID or project number.
  // Output values are always in the project number format.
  string project = 3 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];

  // Output only. The metadata generation of this bucket.
  int64 metageneration = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Immutable. The location of the bucket. StorageObject data for objects in the
  // bucket resides in physical storage within this region.  Defaults to `US`.
  // Attempting to update this field after the bucket is created results in an
  // error.
  string location = 5 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. The location type of the bucket (region, dual-region,
  // multi-region, etc).
  string location_type = 6 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The bucket's default storage class, used whenever no storageClass
  // is specified for a newly-created object. This defines how objects in the
  // bucket are stored and determines the SLA and the cost of storage.
  // If this value is not specified when the bucket is created, it defaults
  // to `STANDARD`. For more information, see [Storage
  // classes](https://developers.google.com/storage/docs/storage-classes).
  string storage_class = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The recovery point objective for cross-region replication of the
  // bucket. Applicable only for dual- and multi-region buckets. `DEFAULT` uses
  // default replication. `ASYNC_TURBO` enables turbo replication, valid for
  // dual-region buckets only. If rpo is not specified when the bucket is
  // created, it defaults to `DEFAULT`. For more information, see [Turbo
  // replication](https://cloud.google.com/storage/docs/availability-durability#turbo-replication).
  string rpo = 27 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Access controls on the bucket.
  // If `iam_config.uniform_bucket_level_access` is enabled on this bucket,
  // requests to set, read, or modify acl is an error.
  repeated BucketAccessControl acl = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Default access controls to apply to new objects when no ACL is
  // provided. If `iam_config.uniform_bucket_level_access` is enabled on this
  // bucket, requests to set, read, or modify acl is an error.
  repeated ObjectAccessControl default_object_acl = 9
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's lifecycle configuration. See [Lifecycle
  // Management](https://developers.google.com/storage/docs/lifecycle) for more
  // information.
  Lifecycle lifecycle = 10 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The creation time of the bucket.
  google.protobuf.Timestamp create_time = 11
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The bucket's [CORS](https://www.w3.org/TR/cors/)
  // configuration.
  repeated Cors cors = 12 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The modification time of the bucket.
  google.protobuf.Timestamp update_time = 13
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The default value for event-based hold on newly created objects
  // in this bucket.  Event-based hold is a way to retain objects indefinitely
  // until an event occurs, signified by the hold's release. After being
  // released, such objects are subject to bucket-level retention (if any).  One
  // sample use case of this flag is for banks to hold loan documents for at
  // least 3 years after loan is paid in full. Here, bucket-level retention is 3
  // years and the event is loan being paid in full. In this example, these
  // objects are held intact for any number of years until the event has
  // occurred (event-based hold on the object is released) and then 3 more years
  // after that. That means retention duration of the objects begins from the
  // moment event-based hold transitioned from true to false.  Objects under
  // event-based hold cannot be deleted, overwritten or archived until the hold
  // is removed.
  bool default_event_based_hold = 14 [(google.api.field_behavior) = OPTIONAL];

  // Optional. User-provided labels, in key/value pairs.
  map<string, string> labels = 15 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's website config, controlling how the service behaves
  // when accessing bucket contents as a web site. See the [Static website
  // examples](https://cloud.google.com/storage/docs/static-website) for more
  // information.
  Website website = 16 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's versioning configuration.
  Versioning versioning = 17 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's logging config, which defines the destination bucket
  // and name prefix (if any) for the current bucket's logs.
  Logging logging = 18 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The owner of the bucket. This is always the project team's
  // owner group.
  Owner owner = 19 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Encryption config for a bucket.
  Encryption encryption = 20 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's billing configuration.
  Billing billing = 21 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's retention policy. The retention policy enforces a
  // minimum retention time for all objects contained in the bucket, based on
  // their creation time. Any attempt to overwrite or delete objects younger
  // than the retention period results in a `PERMISSION_DENIED` error.  An
  // unlocked retention policy can be modified or removed from the bucket via a
  // storage.buckets.update operation. A locked retention policy cannot be
  // removed or shortened in duration for the lifetime of the bucket.
  // Attempting to remove or decrease period of a locked retention policy
  // results in a `PERMISSION_DENIED` error.
  RetentionPolicy retention_policy = 22
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's IAM configuration.
  IamConfig iam_config = 23 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Reserved for future use.
  bool satisfies_pzs = 25 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Configuration that, if present, specifies the data placement for
  // a [configurable
  // dual-region](https://cloud.google.com/storage/docs/locations#location-dr).
  CustomPlacementConfig custom_placement_config = 26
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's Autoclass configuration. If there is no
  // configuration, the Autoclass feature is disabled and has no effect on the
  // bucket.
  Autoclass autoclass = 28 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's hierarchical namespace configuration. If there is no
  // configuration, the hierarchical namespace feature is disabled and has
  // no effect on the bucket.
  HierarchicalNamespace hierarchical_namespace = 32
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's soft delete policy. The soft delete policy prevents
  // soft-deleted objects from being permanently deleted.
  SoftDeletePolicy soft_delete_policy = 31
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's object retention configuration. Must be enabled
  // before objects in the bucket might have retention configured.
  ObjectRetention object_retention = 33
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's IP filter configuration.
  optional IpFilter ip_filter = 38 [(google.api.field_behavior) = OPTIONAL];
}

// An access-control entry.
message BucketAccessControl {
  // Optional. The access permission for the entity.
  string role = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The ID of the access-control entry.
  string id = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The entity holding the permission, in one of the following forms:
  // * `user-{userid}`
  // * `user-{email}`
  // * `group-{groupid}`
  // * `group-{email}`
  // * `domain-{domain}`
  // * `project-{team}-{projectnumber}`
  // * `project-{team}-{projectid}`
  // * `allUsers`
  // * `allAuthenticatedUsers`
  // Examples:
  // * The user `liz@example.com` would be `user-liz@example.com`.
  // * The group `example@googlegroups.com` would be
  // `group-example@googlegroups.com`
  // * All members of the Google Apps for Business domain `example.com` would be
  // `domain-example.com`
  // For project entities, `project-{team}-{projectnumber}` format is
  // returned on response.
  string entity = 3 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The alternative entity format, if exists. For project
  // entities, `project-{team}-{projectid}` format is returned in the response.
  string entity_alt = 9 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The ID for the entity, if any.
  string entity_id = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The `etag` of the `BucketAccessControl`.
  // If included in the metadata of an update or delete request message, the
  // operation operation is only performed if the etag matches that of the
  // bucket's `BucketAccessControl`.
  string etag = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The email address associated with the entity, if any.
  string email = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The domain associated with the entity, if any.
  string domain = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The project team associated with the entity, if any.
  ProjectTeam project_team = 7 [(google.api.field_behavior) = OPTIONAL];
}

// Message used to convey content being read or written, along with an optional
// checksum.
message ChecksummedData {
  // Optional. The data.
  bytes content = 1 [ctype = CORD, (google.api.field_behavior) = OPTIONAL];

  // If set, the CRC32C digest of the content field.
  optional fixed32 crc32c = 2;
}

// Message used for storing full (not subrange) object checksums.
message ObjectChecksums {
  // CRC32C digest of the object data. Computed by the Cloud Storage service for
  // all written objects.
  // If set in a WriteObjectRequest, service validates that the stored
  // object matches this checksum.
  optional fixed32 crc32c = 1;

  // Optional. 128 bit MD5 hash of the object data. For more information about
  // using the MD5 hash, see [Data validation and change
  // detection](https://cloud.google.com/storage/docs/data-validation). Not all
  // objects provide an MD5 hash. For example, composite objects provide only
  // crc32c hashes. This value is equivalent to running `cat object.txt |
  // openssl md5 -binary`
  bytes md5_hash = 2 [(google.api.field_behavior) = OPTIONAL];
}

// The payload of a single user-defined object context.
message ObjectCustomContextPayload {
  // Required. The value of the object context.
  string value = 1 [(google.api.field_behavior) = REQUIRED];

  // Output only. The time at which the object context was created.
  google.protobuf.Timestamp create_time = 2
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time at which the object context was last updated.
  google.protobuf.Timestamp update_time = 3
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// All contexts of an object grouped by type.
message ObjectContexts {
  // Optional. User-defined object contexts.
  // The maximum key or value size is `256` characters.
  // The maximum number of entries is `50`.
  // The maximum total serialized size of all entries is `25KiB`.
  map<string, ObjectCustomContextPayload> custom = 1
      [(google.api.field_behavior) = OPTIONAL];
}

// Describes the customer-supplied encryption key mechanism used to store an
// object's data at rest.
message CustomerEncryption {
  // Optional. The encryption algorithm.
  string encryption_algorithm = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. SHA256 hash value of the encryption key.
  // In raw bytes format (not base64-encoded).
  bytes key_sha256_bytes = 3 [(google.api.field_behavior) = OPTIONAL];
}

// An object.
message StorageObject {
  // Specifies retention parameters of the object. Objects under retention
  // cannot be deleted or overwritten until their retention expires.
  message Retention {
    // Retention mode values.
    enum Mode {
      // No specified mode. StorageObject is not under retention.
      MODE_UNSPECIFIED = 0;

      // Retention period might be decreased or increased.
      // The Retention configuration might be removed.
      // The mode might be changed to locked.
      UNLOCKED = 1;

      // Retention period might be increased.
      // The Retention configuration cannot be removed.
      // The mode cannot be changed.
      LOCKED = 2;
    }

    // Optional. The mode of the Retention.
    Mode mode = 1 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The timestamp that the object needs to be retained until.
    // Value cannot be set in the past or more than 100 years in the future.
    google.protobuf.Timestamp retain_until_time = 2
        [(google.api.field_behavior) = OPTIONAL];
  }

  // Immutable. The name of this object. Nearly any sequence of unicode
  // characters is valid. See
  // [Guidelines](https://cloud.google.com/storage/docs/objects#naming).
  // Example: `test.txt`
  // The `name` field by itself does not uniquely identify a Cloud Storage
  // object. A Cloud Storage object is uniquely identified by the tuple of
  // (bucket, object, generation).
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. The name of the bucket containing this object.
  string bucket = 2 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Optional. The `etag` of an object.
  // If included in the metadata of an update or delete request message, the
  // operation is only performed if the etag matches that of the live
  // object.
  string etag = 27 [(google.api.field_behavior) = OPTIONAL];

  // Immutable. The content generation of this object. Used for object
  // versioning.
  int64 generation = 3 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. Restore token used to differentiate deleted objects with the
  // same name and generation. This field is output only, and only set for
  // deleted objects in HNS buckets.
  optional string restore_token = 35
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The version of the metadata for this generation of this
  // object. Used for preconditions and for detecting changes in metadata. A
  // metageneration number is only meaningful in the context of a particular
  // generation of a particular object.
  int64 metageneration = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Storage class of the object.
  string storage_class = 5 [(google.api.field_behavior) = OPTIONAL];

  // Output only. Content-Length of the object data in bytes, matching
  // [RFC 7230 §3.3.2](https://tools.ietf.org/html/rfc7230#section-3.3.2]).
  int64 size = 6 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Content-Encoding of the object data, matching
  // [RFC 7231 §3.1.2.2](https://tools.ietf.org/html/rfc7231#section-3.1.2.2)
  string content_encoding = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Content-Disposition of the object data, matching
  // [RFC 6266](https://tools.ietf.org/html/rfc6266).
  string content_disposition = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Cache-Control directive for the object data, matching
  // [RFC 7234 §5.2](https://tools.ietf.org/html/rfc7234#section-5.2).
  // If omitted, and the object is accessible to all anonymous users, the
  // default is `public, max-age=3600`.
  string cache_control = 9 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Access controls on the object.
  // If `iam_config.uniform_bucket_level_access` is enabled on the parent
  // bucket, requests to set, read, or modify acl is an error.
  repeated ObjectAccessControl acl = 10
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Content-Language of the object data, matching
  // [RFC 7231 §3.1.3.2](https://tools.ietf.org/html/rfc7231#section-3.1.3.2).
  string content_language = 11 [(google.api.field_behavior) = OPTIONAL];

  // Output only. If this object is noncurrent, this is the time when the object
  // became noncurrent.
  google.protobuf.Timestamp delete_time = 12
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time when the object was finalized.
  google.protobuf.Timestamp finalize_time = 36
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Content-Type of the object data, matching
  // [RFC 7231 §3.1.1.5](https://tools.ietf.org/html/rfc7231#section-3.1.1.5).
  // If an object is stored without a Content-Type, it is served as
  // `application/octet-stream`.
  string content_type = 13 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The creation time of the object.
  google.protobuf.Timestamp create_time = 14
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Number of underlying components that make up this object.
  // Components are accumulated by compose operations.
  int32 component_count = 15 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Hashes for the data part of this object. This field is used
  // for output only and is silently ignored if provided in requests. The
  // checksums of the complete object regardless of data range. If the object is
  // downloaded in full, the client should compute one of these checksums over
  // the downloaded object and compare it against the value provided here.
  ObjectChecksums checksums = 16 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The modification time of the object metadata.
  // Set initially to object creation time and then updated whenever any
  // metadata of the object changes. This includes changes made by a requester,
  // such as modifying custom metadata, as well as changes made by Cloud Storage
  // on behalf of a requester, such as changing the storage class based on an
  // StorageObject Lifecycle Configuration.
  google.protobuf.Timestamp update_time = 17
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Cloud KMS Key used to encrypt this object, if the object is
  // encrypted by such a key.
  string kms_key = 18 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "cloudkms.googleapis.com/CryptoKey"
    }
  ];

  // Output only. The time at which the object's storage class was last changed.
  // When the object is initially created, it is set to `time_created`.
  google.protobuf.Timestamp update_storage_class_time = 19
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Whether an object is under temporary hold. While this flag is set
  // to true, the object is protected against deletion and overwrites.  A common
  // use case of this flag is regulatory investigations where objects need to be
  // retained while the investigation is ongoing. Note that unlike event-based
  // hold, temporary hold does not impact retention expiration time of an
  // object.
  bool temporary_hold = 20 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A server-determined value that specifies the earliest time that
  // the object's retention period expires. Note 1: This field is not provided
  // for objects with an active event-based hold, since retention expiration is
  // unknown until the hold is removed. Note 2: This value can be provided even
  // when temporary hold is set (so that the user can reason about policy
  // without having to first unset the temporary hold).
  google.protobuf.Timestamp retention_expire_time = 21
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. User-provided metadata, in key/value pairs.
  map<string, string> metadata = 22 [(google.api.field_behavior) = OPTIONAL];

  // Optional. User-defined or system-defined object contexts. Each object
  // context is a key-payload pair, where the key provides the identification
  // and the payload holds the associated value and additional metadata.
  ObjectContexts contexts = 38 [(google.api.field_behavior) = OPTIONAL];

  // Whether an object is under event-based hold.
  // An event-based hold is a way to force the retention of an object until
  // after some event occurs. Once the hold is released by explicitly setting
  // this field to `false`, the object becomes subject to any bucket-level
  // retention policy, except that the retention duration is calculated
  // from the time the event based hold was lifted, rather than the time the
  // object was created.
  //
  // In a `WriteObject` request, not setting this field implies that the value
  // should be taken from the parent bucket's `default_event_based_hold` field.
  // In a response, this field is always set to `true` or `false`.
  optional bool event_based_hold = 23;

  // Output only. The owner of the object. This is always the uploader of the
  // object.
  Owner owner = 24 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Metadata of customer-supplied encryption key, if the object is
  // encrypted by such a key.
  CustomerEncryption customer_encryption = 25
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. A user-specified timestamp set on an object.
  google.protobuf.Timestamp custom_time = 26
      [(google.api.field_behavior) = OPTIONAL];

  // Output only. This is the time when the object became soft-deleted.
  //
  // Soft-deleted objects are only accessible if a soft_delete_policy is
  // enabled. Also see `hard_delete_time`.
  optional google.protobuf.Timestamp soft_delete_time = 28
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time when the object is permanently deleted.
  //
  // Only set when an object becomes soft-deleted with a `soft_delete_policy`.
  // Otherwise, the object is not accessible.
  optional google.protobuf.Timestamp hard_delete_time = 29
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Retention configuration of this object.
  // Might only be configured if the bucket has object retention enabled.
  Retention retention = 30 [(google.api.field_behavior) = OPTIONAL];
}

// An access-control entry.
message ObjectAccessControl {
  // Optional. The access permission for the entity. One of the following
  // values:
  // * `READER`
  // * `WRITER`
  // * `OWNER`
  string role = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The ID of the access-control entry.
  string id = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The entity holding the permission, in one of the following forms:
  // * `user-{userid}`
  // * `user-{email}`
  // * `group-{groupid}`
  // * `group-{email}`
  // * `domain-{domain}`
  // * `project-{team}-{projectnumber}`
  // * `project-{team}-{projectid}`
  // * `allUsers`
  // * `allAuthenticatedUsers`
  // Examples:
  // * The user `liz@example.com` would be `user-liz@example.com`.
  // * The group `example@googlegroups.com` would be
  // `group-example@googlegroups.com`.
  // * All members of the Google Apps for Business domain `example.com` would be
  // `domain-example.com`.
  // For project entities, `project-{team}-{projectnumber}` format is
  // returned in the response.
  string entity = 3 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The alternative entity format, if exists. For project
  // entities, `project-{team}-{projectid}` format is returned in the response.
  string entity_alt = 9 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The ID for the entity, if any.
  string entity_id = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The etag of the ObjectAccessControl.
  // If included in the metadata of an update or delete request message, the
  // operation is only performed if the etag matches that of the live
  // object's ObjectAccessControl.
  string etag = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The email address associated with the entity, if any.
  string email = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The domain associated with the entity, if any.
  string domain = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The project team associated with the entity, if any.
  ProjectTeam project_team = 7 [(google.api.field_behavior) = OPTIONAL];
}

// The result of a call to Objects.ListObjects
message ListObjectsResponse {
  // The list of items.
  repeated StorageObject objects = 1;

  // The list of prefixes of objects matching-but-not-listed up to and including
  // the requested delimiter.
  repeated string prefixes = 2;

  // The continuation token, used to page through large result sets. Provide
  // this value in a subsequent request to return the next page of results.
  string next_page_token = 3;
}

// Represents the Viewers, Editors, or Owners of a given project.
message ProjectTeam {
  // Optional. The project number.
  string project_number = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The team.
  string team = 2 [(google.api.field_behavior) = OPTIONAL];
}

// The owner of a specific resource.
message Owner {
  // Optional. The entity, in the form `user-`*userId*.
  string entity = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The ID for the entity.
  string entity_id = 2 [(google.api.field_behavior) = OPTIONAL];
}

// Specifies a requested range of bytes to download.
message ContentRange {
  // The starting offset of the object data. This value is inclusive.
  int64 start = 1;

  // The ending offset of the object data. This value is exclusive.
  int64 end = 2;

  // The complete length of the object data.
  int64 complete_length = 3;
}