import { CloudFunction, EventContext } from "../cloud-functions";
import { Expression } from "../../params/types";
/**
 * Registers a Cloud Function scoped to a specific storage bucket.
 *
 * @param bucket Name of the bucket to which this Cloud Function is
 *   scoped.
 *
 * @returns Storage bucket builder interface.
 */
export declare function bucket(bucket?: string | Expression<string>): BucketBuilder;
/**
 * Registers a Cloud Function scoped to the default storage bucket for the
 * project.
 *
 * @returns Storage object builder interface.
 */
export declare function object(): ObjectBuilder;
/**
 * The Google Cloud Storage bucket builder interface.
 *
 * Access via `functions.storage.bucket()`.
 */
export declare class BucketBuilder {
    private triggerResource;
    private options;
    /**
     * Event handler which fires every time a Google Cloud Storage change occurs.
     *
     * @returns Storage object builder interface scoped to the specified storage
     *   bucket.
     */
    object(): ObjectBuilder;
}
/**
 * The Google Cloud Storage object builder interface.
 *
 * Access via `functions.storage.object()`.
 */
export declare class ObjectBuilder {
    private triggerResource;
    private options;
    /**
     * Event handler sent only when a bucket has enabled object versioning.
     * This event indicates that the live version of an object has become an
     * archived version, either because it was archived or because it was
     * overwritten by the upload of an object of the same name.
     *
     * @param handler Event handler which is run every time a Google Cloud Storage
     *   archival occurs.
     *
     * @returns A function which you can export and deploy.
     */
    onArchive(handler: (object: ObjectMetadata, context: EventContext) => PromiseLike<any> | any): CloudFunction<ObjectMetadata>;
    /**
     * Event handler which fires every time a Google Cloud Storage deletion occurs.
     *
     * Sent when an object has been permanently deleted. This includes objects
     * that are overwritten or are deleted as part of the bucket's lifecycle
     * configuration. For buckets with object versioning enabled, this is not
     * sent when an object is archived, even if archival occurs
     * via the `storage.objects.delete` method.
     *
     * @param handler Event handler which is run every time a Google Cloud Storage
     *   deletion occurs.
     *
     * @returns A function which you can export and deploy.
     */
    onDelete(handler: (object: ObjectMetadata, context: EventContext) => PromiseLike<any> | any): CloudFunction<ObjectMetadata>;
    /**
     * Event handler which fires every time a Google Cloud Storage object
     * creation occurs.
     *
     * Sent when a new object (or a new generation of an existing object)
     * is successfully created in the bucket. This includes copying or rewriting
     * an existing object. A failed upload does not trigger this event.
     *
     * @param handler Event handler which is run every time a Google Cloud Storage
     *   object creation occurs.
     *
     * @returns A function which you can export and deploy.
     */
    onFinalize(handler: (object: ObjectMetadata, context: EventContext) => PromiseLike<any> | any): CloudFunction<ObjectMetadata>;
    /**
     * Event handler which fires every time the metadata of an existing object
     * changes.
     *
     * @param handler Event handler which is run every time a Google Cloud Storage
     *   metadata update occurs.
     *
     * @returns A function which you can export and deploy.
     */
    onMetadataUpdate(handler: (object: ObjectMetadata, context: EventContext) => PromiseLike<any> | any): CloudFunction<ObjectMetadata>;
    /** @hidden */
    private onOperation;
}
/** Interface representing a Google Google Cloud Storage object metadata object. */
export interface ObjectMetadata {
    /** The kind of the object, which is always `storage#object`. */
    kind: string;
    /**
     * The ID of the object, including the bucket name, object name, and
     * generation number.
     */
    id: string;
    /** Storage bucket that contains the object. */
    bucket: string;
    /** Storage class of the object. */
    storageClass: string;
    /**
     * The value of the `Content-Length` header, used to determine  the length of
     * the object data in bytes.
     */
    size: string;
    /** The creation time of the object in RFC 3339 format. */
    timeCreated: string;
    /**
     * The modification time of the object metadata in RFC 3339 format.
     */
    updated: string;
    /** Link to access the object, assuming you have sufficient permissions. */
    selfLink?: string;
    /** The object's name. */
    name?: string;
    /**
     * Generation version number that changes each time the object is
     * overwritten.
     */
    generation?: string;
    /** The object's content type, also known as the MIME type. */
    contentType?: string;
    /**
     * Meta-generation version number that changes each time the object's metadata
     * is updated.
     */
    metageneration?: string;
    /**
     * The deletion time of the object in RFC 3339 format. Returned
     * only if this version of the object has been deleted.
     */
    timeDeleted?: string;
    timeStorageClassUpdated?: string;
    /**
     * MD5 hash for the object. All Google Cloud Storage objects
     * have a CRC32C hash or MD5 hash.
     */
    md5Hash?: string;
    /** Media download link. */
    mediaLink?: string;
    /**
     * Content-Encoding to indicate that an object is compressed
     * (for example, with gzip compression) while maintaining its Content-Type.
     */
    contentEncoding?: string;
    /**
     * The value of the `Content-Disposition` header, used to specify presentation
     * information about the data being transmitted.
     */
    contentDisposition?: string;
    /** ISO 639-1 language code of the content. */
    contentLanguage?: string;
    /**
     * The value of the `Cache-Control` header, used to determine whether Internet
     * caches are allowed to cache public data for an object.
     */
    cacheControl?: string;
    /** User-provided metadata. */
    metadata?: {
        [key: string]: string;
    };
    acl?: [
        {
            kind?: string;
            id?: string;
            selfLink?: string;
            bucket?: string;
            object?: string;
            generation?: string;
            entity?: string;
            role?: string;
            email?: string;
            entityId?: string;
            domain?: string;
            projectTeam?: {
                projectNumber?: string;
                team?: string;
            };
            etag?: string;
        }
    ];
    owner?: {
        entity?: string;
        entityId?: string;
    };
    /**
     * The object's CRC32C hash. All Google Cloud Storage objects
     * have a CRC32C hash or MD5 hash.
     */
    crc32c?: string;
    /**
     * Specifies the number of originally uploaded objects from which
     * a composite object was created.
     */
    componentCount?: string;
    etag?: string;
    /**
     * Customer-supplied encryption key.
     *
     * This object contains the following properties:
     * * `encryptionAlgorithm` (`string|undefined`): The encryption algorithm that
     *   was used. Always contains the value `AES256`.
     * * `keySha256` (`string|undefined`): An RFC 4648 base64-encoded string of the
     *   SHA256 hash of your encryption key. You can use this SHA256 hash to
     *   uniquely identify the AES-256 encryption key required to decrypt the
     *   object, which you must store securely.
     */
    customerEncryption?: {
        encryptionAlgorithm?: string;
        keySha256?: string;
    };
}