feat(Azure Storage and helpers): getBinaryBlob and decompress gzip fi…

…les functions (#147)

* feat(Azure Storage): getBinaryBlob and decompress gzip files functions

- This gets a binary blob  _without_ writing it to a file. This is a variation on the `getBlob` and `downloadBlobToFile` functions.
- New function to decompress gzip files

* chore: adds gunzip-maybe pacakge

* chore(deps-dev): bump globals in the dev-dependencies group (#146)



---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -21,6 +21,7 @@
     "@azure/storage-queue": "^12.11.0",
     "azure-devops-node-api": "^14.0.1",
     "dayjs": "^1.11.7",
+    "gunzip-maybe": "^1.4.2",
     "node-fetch": "^2.6.7",
     "sparkly": "^5.0.0",
     "sqlite": "^5.0.1",

src/azure.js

@@ -210,8 +210,7 @@ getStorageQueueSignedURL(queueUrl,options) {
 
   /**
    * Gets a blob and returns the content. The idea is that you can get a blob without 
-   * having to save it to a file and then re-read it. This may be limited in that it 
-   * can only deal with non-binary content.
+   * having to save it to a file and then re-read it. This cannot handle binary data
    * 
    * @param {string} containerName the container to get the blob from
    * @param {string} blobName the name of the blob to get
@@ -236,6 +235,30 @@ getStorageQueueSignedURL(queueUrl,options) {
 
   }
 
+
+  /**
+   * Gets a blob and returns the content as a Buffer.
+   * 
+   * @param {string} containerName the container to get the blob from
+   * @param {string} blobName the name of the blob to get
+   * @returns {Buffer} the downloaded blob as 
+   */
+  async getBinaryBlob(containerName,blobName) {
+    const blobServiceClient = new BlobServiceClient(
+      this.host('blob',this.cloudName),
+      new StorageSharedKeyCredential(this.storageAccountName, this.storageAccountKey)
+    );
+    const containerClient = blobServiceClient.getContainerClient(containerName);
+    const blobClient = containerClient.getBlobClient(blobName);
+
+     // Get blob content from position 0 to the end
+    // In Node.js, get downloaded data by accessing downloadBlockBlobResponse.readableStreamBody
+    const downloadBlockBlobResponse = await blobClient.download();
+    const downloaded = await streamToBuffer(downloadBlockBlobResponse.readableStreamBody);
+    return downloaded
+
+  }
+
   /**
    * Lists the blobs in a specified container, returning an array of the BlobItem object
    *