Generate presigned URL - Flutter

You have the option to create presigned URL, allowing you to upload your recordings to AWS, Azure, or GCP securely. presigned URL provide a secure and temporary way to upload objects to your cloud storage. Instead of sharing your entire credentials, you can create a special URL that allows uploading a specific file for a limited time.

important

While presigned URL offer a convenient way to upload files securely, each cloud provider (AWS, Azure, and GCP) might have different restrictions on how they work. It's advisable to refer the respective documentation for AWS, Azure, and GCP to gain a clearer understanding of presigned URL.

Code Sample

This guide will walk you through the process of generating a presigned URL for uploading recordings to your cloud storage of choice. You can use this generated presigned URL in Start Recording API.

AWS

const { S3Client, PutObjectCommand } = require("@aws-sdk/client-s3");
const { getSignedUrl } = require("@aws-sdk/s3-request-presigner");
import fetch from 'node-fetch';

const region = <YOUR S3 REGION>;
const bucket = <YOUR S3 BUCKET NAME>;
const key = <YOUR FILE NAME>; // test/abc.mp4
const accessKeyId = <YOUR S3 ACCESS KEY ID>;
const secretAccessKey = <YOUR S3 SECRET ACCESS KEY>;
const expiresIn = <URL EXPIRY IN SECONDS>; // this number should be higher than duraion of recording

const s3Client = new S3Client({
    credentials: {
        accessKeyId: accessKeyId,
        secretAccessKey: secretAccessKey,
    },
    region: region,
});

const createPresignedUrlWithClient = async () => {
    const command = new PutObjectCommand({ Bucket: bucket, Key: key });
    const preSignedUrl = await getSignedUrl(s3Client, command, { expiresIn: expiresIn });
    return preSignedUrl;
};

// you can use this presigned url like this
async function main() {
  let preSignedUrl = await createPresignedUrlWithClient();
  const options = {
    method: "POST",
    headers: {
      Authorization: "$YOUR_TOKEN",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      roomId: "abcd-efgh-ijkl",
      preSignedUrl: preSignedUrl
    }),
  };
  const url = `https://api.videosdk.live/v2/recordings/start`;
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
}

main();

AZURE

const { BlobServiceClient, BlobSASPermissions } = require("@azure/storage-blob");
import fetch from 'node-fetch';

const connectionString = <YOUR AZURE STORAGE CONNECTION STRING>;
const containerName = <YOUR AZURE CONTAINER NAME>;
const blobName = <YOUR AZURE BLOB NAME>;
const startsOn = <YOUR SASURL START TIME>; // (optional, defaults to now)
const expiresOn = <YOUR SASURL EXPIRY TIME>; // expiry time should be higher than duration of recording

const generateSASUrl = async () => {
    let blobServiceClient = BlobServiceClient.fromConnectionString(connectionString);
    let containerClient = blobServiceClient.getContainerClient(containerName);

    await containerClient.createIfNotExists({
        access: "container",
    });

    const blockBlobClient = containerClient.getBlockBlobClient(blobName);
    const sasUrl = await blockBlobClient.generateSasUrl({
        startsOn: startsOn, // sasUrl start time
        expiresOn: expiresOn, // sasUrl expiration time
        permissions: BlobSASPermissions.parse("write"),
    });
    return sasUrl;
};

// you can use this presigned url like this
async function main() {
  let preSignedUrl = await generateSASUrl();
  const options = {
    method: "POST",
    headers: {
      Authorization: "$YOUR_TOKEN",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      roomId: "abcd-efgh-ijkl",
      preSignedUrl: preSignedUrl
    }),
  };
  const url = `https://api.videosdk.live/v2/recordings/start`;
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
}

main();

GCP

const { Storage } = require("@google-cloud/storage");
import fetch from 'node-fetch';

const projectId = <YOUR GCP PROJECT ID>;
const clientEmail = <YOUR GCP CLIENT EMAIL>;
const privateKey = <YOUR GCP PRIVATE KEY>;
const expires =<URL EXPIRY IN SECONDS>; // this number should be higher than duraion of recording
const bucketName = <YOUR GCP BUCKET NAME>;
const fileName = <YOUR FILE NAME>; // test/abc.mp4

const storage = new Storage({
    projectId: projectId,
    credentials: {
        client_email: clientEmail,
        private_key: privateKey,
    },
});

const generateSignedUrl = async () => {
    const options = {
        version: "v4",
        action: "write",
        expires: expires,
        contentType: "video/mp4",
    };

    const [signedUrl] = storage.bucket(bucketName).file(fileName).getSignedUrl(options);
    return signedUrl;
};

// you can use this presigned url like this
async function main() {
  let preSignedUrl = await generateSignedUrl();
  const options = {
    method: "POST",
    headers: {
      Authorization: "$YOUR_TOKEN",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      roomId: "abcd-efgh-ijkl",
      preSignedUrl: preSignedUrl
    }),
  };
  const url = `https://api.videosdk.live/v2/recordings/start`;
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
}

main();

API Reference

The API references for all the methods utilized in this guide are provided below.

• Start Recording API