import { BlobHTTPHeaders, BlobItem, BlobServiceClient, HttpRequestBody } from "@azure/storage-blob";
import { Readable } from "stream";
export declare enum BlobPermissions {
    READ = "r",
    WRITE = "w",
    CREATE = "c",
    DELETE = "d",
    ADD = "a"
}
export interface SASOptions {
    startsOn?: Date;
    expiresOn?: Date;
    permissions?: BlobPermissions[];
}
interface SASUrlComponents {
    sasQueryString: string;
    containerName: string;
    blobName?: string;
    fullUrl: string;
    fullUrlWithSAS: string;
}
export interface ManagedIdentityOptions {
    accountName: string;
    managedIdentityClientId?: string;
}
/**
 * @class BlobStorage - A class that contains azure blob storage helpers
 */
export declare class BlobStorage {
    private connectionStringOrSASUrl?;
    private accountName?;
    private managedIdentityClientId?;
    private useManagedIdentity;
    constructor(connectionStringOrSASUrl: string);
    constructor(managedIdentityOptions: ManagedIdentityOptions);
    isEmulatorConnection(): boolean;
    isSASUrl(): boolean;
    /**
     * @returns {BlobServiceClient} - A BlobServiceClient object
     */
    getBlobServiceUrl(): BlobServiceClient;
    /**
     * Creates a container in Azure Blob Storage if it does not already exist.
     *
     * @param containerName - The name of the container to create.
     * @param sasUrl - Optional. The SAS URL for accessing the Blob service. If not provided, the default Blob service URL will be used.
     * @returns A promise that resolves to a boolean indicating whether the container was successfully created or already exists.
     */
    createContainer(containerName: string): Promise<boolean>;
    /**
     * Deletes a container in Azure Blob Storage if it exists.
     *
     * @param containerName - The name of the container to delete.
     * @returns A promise that resolves to a boolean indicating whether the container was successfully deleted.
     */
    deleteContainer(containerName: string): Promise<boolean>;
    /**
     * @param {string} containerName - The name of the container to check
     * @param {string} blobNamePrefix - The prefix of the blob name
     * @returns {Promise<Array<BlobItem>>} - An array of BlobItem objects
     */
    listBlobs(containerName: string, blobNamePrefix: string): Promise<BlobItem[]>;
    /**
     * @param {string} containerName - The name of the container to download from
     * @param {string} blobName - The name of the blob to download
     * @returns {Promise<Buffer>} - A Buffer object
     */
    downloadBlob(containerName: string, blobName: string): Promise<Buffer>;
    /**
     * @param {string} containerName - The name of the container to check
     * @param {string} blobName - The name of the blob to check
     * @returns {Promise<boolean>} - A boolean indicating whether or not the blob exists
     */
    blobExists(containerName: string, blobName: string): Promise<boolean>;
    /**
     * @param {string} containerName - The name of the container to upload to
     * @param {string} blobName - The name of the blob to upload
     * @param {HttpRequestBody} body - The body of the blob
     * @param {string} contentLength - The content length
     * @param {string} contentType - The content type of the blob
     * @returns {Promise<boolean>} - A boolean indicating whether or not the blob was successfully uploaded
     */
    upload(containerName: string, blobName: string, body: HttpRequestBody, contentLength: number, contentType: string): Promise<boolean>;
    /**
     * @param {string} containerName - The name of the container to upload to
     * @param {string} blobName - The name of the blob to upload
     * @param data -  Buffer | Blob | ArrayBuffer | ArrayBufferView
     * @param {BlobHTTPHeaders} [blobHTTPHeaders] - The blob HTTP headers to set while uploading the blob
     * @param bufferSize - Size of every buffer allocated, also the block size in the uploaded block blob. Default value is 8MB
     * @returns {Promise<boolean>} - A boolean indicating whether or not the blob was successfully uploaded
     */
    uploadData(containerName: string, blobName: string, data: Buffer | Blob | ArrayBuffer | ArrayBufferView, blobHTTPHeaders?: BlobHTTPHeaders): Promise<boolean>;
    /**
     * @param {string} containerName - The name of the container to upload to
     * @param {string} blobName - The name of the blob to upload
     * @param stream - Node.js Readable stream
     * @param {BlobHTTPHeaders} [blobHTTPHeaders] - The blob HTTP headers to set while uploading the blob
     * @param bufferSize - Size of every buffer allocated, also the block size in the uploaded block blob. Default value is 8MB
     * @returns {Promise<boolean>} - A boolean indicating whether or not the blob was successfully uploaded
     */
    uploadStream(containerName: string, blobName: string, stream: Readable, blobHTTPHeaders?: BlobHTTPHeaders): Promise<boolean>;
    /**
     * * Generates a Shared Access Signature (SAS) URL for a blob or container
     *
     * When using managed identity, this generates a User Delegation SAS (more secure, recommended).
     * When using connection string, this generates a Service SAS.
     *
     * @param {string} containerName - The name of the blob container
     * @param {string} [blobName] - Optional. The name of the specific blob. If not provided, the SAS token will be generated for the container level
     * @param {SASOptions} [sasOptions={}] - Optional. The options used for generating the SAS token
     * @returns {Promise<SASUrlComponents>} - Object containing:
     *   - fullUrlWithSAS: The complete URL with SAS token
     *   - fullUrl: The complete URL without SAS token
     *   - containerName: The name of the blob container
     *   - blobName: The name of the specific blob (if provided)
     *   - sasQueryString: The SAS token query parameters
     */
    generateSASUrl(containerName: string, blobName?: string, sasOptions?: SASOptions): Promise<SASUrlComponents>;
    /**
     * Deletes a blob from the specified container.
     *
     * @param {string} containerName - The name of the container containing the blob
     * @param {string} blobName - The name of the blob to delete
     * @returns {Promise<boolean>} - A boolean indicating whether the blob was successfully deleted
     */
    deleteBlob(containerName: string, blobName: string): Promise<boolean>;
}
export {};