LargeFileUploadTask.md

Large File Upload Task - Uploading large files to OneDrive, Outlook, Print API.

References -

• Outlook's large file attachment
• OneDrive's resumable upload
• Print API's large file upload

Creating the client instance

Refer this documentation for initializing the client.

Using the LargeFileUpload Task

Create an upload session

First step for any upload task is the creation of the upload session.

Example of a payload for Outlook

const payload = {
	AttachmentItem: {
		attachmentType: "file",
		name: "<FILE_NAME>",
		size: FILE_SIZE,
	},
};

Example of a payload for OneDrive

const payload = {
	item: {
		"@microsoft.graph.conflictBehavior": "rename",
		name: "<FILE_NAME>",
	},
};

Create the upload session

const uploadSession = LargeFileUploadTask.createUploadSession(client, "REQUEST_URL", payload);

Creating the LargeFileUploadTask object

• First, you will need to initialize a Client instance. This client instance should passed as a parameter when creating the LargeFileUploadTask or OneDriveLargeFileUploadTask object.
• To create the LargeFileUploadTask object you need to create - - An upload session as shown above. - A FileObject instance.

FileObject Interface

export interface FileObject<T> {
	content: T;
	name: string;
	size: number;
	sliceFile(range: Range): Promise<ArrayBuffer | Blob | Buffer>;
}

The Microsoft Graph JavaScript Client SDK provides two implementations -

1. StreamUpload - Supports Node.js stream upload

import StreamUpload from "@microsoft/microsoft-graph-client";
import * as fs from "fs";

const fileName = "<FILE_NAME>";
const stats = fs.statSync(`./test/sample_files/${fileName}`);
const totalsize = stats.size;
const readStream = fs.createReadStream(`./test/sample_files/${fileName}`);
const fileObject = new StreamUpload(readStream, fileName, totalsize);

Note - In case of a browser application, you can use stream-browserify and buffer.

2. FileUpload - Supports upload of file formats - ArrayBuffer, Blob, Buffer

import FileUpload from "@microsoft/microsoft-graph-client";
import * as fs from "fs";

const fileName = "<FILE_NAME>";
const stats = fs.statSync(`./test/sample_files/${fileName}`);
const totalsize = stats.size;
const fileContent = fs.readFileSync(`./test/sample_files/${fileName}`);
const fileObject = new FileUpload(fileContent, fileName, totalsize);

Note - You can also have a customized FileObject implementation which contains the sliceFile(range: Range) function which implements the logic to split the file into ranges.

Initiate the LargefileUploadTask options with Progress Handler and Range Size

const progress = (range?: Range, extraCallBackParam?: unknown) => {
	// Handle progress event
};

const uploadEventHandlers: UploadEventHandlers = {
	progress,
	extraCallBackParam, // additional parameters to the callback
};

const options: LargeFileUploadTaskOptions = {
	rangeSize: 327680,
	uploadEventHandlers: UploadEventHandlers,
};

Create a LargefileUploadTask object

const uploadTask = new LargeFileUploadTask(client, fileObject, uploadSession, optionsWithProgress);
const uploadResult: UploadResult = await uploadTask.upload();

UploadResult contains the location(received in the Outlook API response headers) and the responseBody (responseBody received after successful upload.) properties.

OneDriveLargeFileUploadTask.

You can also use OneDriveLargeFileUploadTask which provides easier access to upload to OneDrive API

Example -

const uploadEventHandlers: UploadEventHandlers = {
	progress,
	extraCallBackParam: true,
};

const options: OneDriveLargeFileUploadOptions = {
	path: "/Documents",
	fileName,
	rangeSize: 1024 * 1024,
	uploadEventHandlers,
};
const readStream = fs.createReadStream(`./fileName`);
const fileObject = new StreamUpload(readStream, fileName, totalsize);
or
const uploadContent = fs.readFileSync(`./fileName`);
const fileObject = new FileUpload(uploadContent, fileName, totalsize);

const uploadTask = await OneDriveLargeFileUploadTask.createTaskWithFileObject(client, fileObject, options);
const uploadResult:UploadResult = await uploadTask.upload();
}

Note: The OneDriveLargeFileUploadTask.createTaskWithFileObject also handles the upload session creation.**

We can just resume the broken upload

Lets consider some break down happens in the middle of uploading, with the uploadTask object in hand you can resume easily.

uploadTask.resume();

Even you can control the whole upload process

You can create the upload task, and play with it by using sliceFile and uploadSlice methods

let range = uploadTask.getNextRange();
let slicedFile = uploadTask.sliceFile(range);
uploadTask.uploadSlice(slicedFile, range, uploadTask.file.size);

Cancelling a largeFileUpload task

Cancelling an upload session sends a DELETE request to the upload session URL

const cancelResponse = await uploadTask.cancel();

Get the largeFileUpload session

Returns the largeFileUpload session information containing the URL, expiry date and cancellation status of the task

const uploadsession: LargeFileUploadSession = uploadTask.getUploadSession();

Samples

Check out the samples for:

• LargeFileUploadTask - JavaScript - Typescript

• OneDriveLargeFileUploadTask - JavaScript - TypeScript