Uploading a file to Azure File Storage

Question

I have a url with a SAS token to upload a file. I have a base64 string of a previously defined content type that I need to upload.

import { FileUploadStreamOptions, ShareFileClient } from "@azure/storage-file-share";
import { Readable } from "readable-stream";

async submitData(context: ComponentFramework.Context<IInputs>, fileName: string, ext: string, base64: string, contentType: string, classification: string, upload: any) : Promise<boolean> {
   const buffer = Buffer.from(base64, 'base64');

   let client = new ShareFileClient(upload.url);
   let readable = Readable.from(buffer);

   const options = {
       fileHttpHeaders: { 
          fileContentType: contentType,
       },
   };

   await client.uploadStream(readable, buffer.length, 4 * 1024 * 1024, 5, options);
   console.log("Upload successful");
   
   // more logic
   return true;
}

I'm having two problems with this code:

The await client.uploadStream(readable, buffer.length, 4 * 1024 * 1024, 5, options); is not being awaited and the method is escaped.
The uploaded file is corrupted. When downloaded, the content comes back as:

{"$content-type":"application/pdf","$content":"AAAAAAAAAAAAAA...AAAAA"}

I have tried not awaiting the call and that seems to work for the most part although it really should be awaited.
I tried adding encoding to the stream but that didn't seem to work either.

You need to upload larger files to azure file share using react js is it right? — Venkatesan
– Venkatesan, Commented Oct 22, 2024 at 3:32

Venkatesan · Accepted Answer · 2024-10-22 09:18:28Z

I have a url with a SAS token to upload a file. I have a base64 string of a previously defined content type that I need to upload.

You can use the below code to upload the pdf file in the Azure file share.

Code:

// upload.ts
import { ShareFileClient, FileUploadStreamOptions } from "@azure/storage-file-share";
import { Readable } from "stream"; 

async function submitData(fileName: string, base64: string, contentType: string, uploadUrl: string): Promise<boolean> {
    try {
        const buffer = Buffer.from(base64, 'base64');
        const client = new ShareFileClient(uploadUrl);
        const readable = Readable.from(buffer);
        
        const options: FileUploadStreamOptions = {
            fileHttpHeaders: { 
                fileContentType: contentType,
            },
        };
        await client.uploadStream(readable, buffer.length, 4 * 1024 * 1024, 5, options);
        console.log("Upload successful");
        
        return true;
    } catch (error) {
        console.error("Upload failed:", error);
        return false;
    }
}

const main = async () => {
    const fileName = "example.pdf"; // Set the file name
    const contentType = "application/pdf"; // Set the content type

    const uploadUrl = "https://<storage account name>.file.core.windows.net/<share name>/<filename>?sv=2022-11-02&ss=bfqt&srt=sco&sp=rwdlacupiytfx&se=2024-10-22T16:45:20Z&st=2024-10-22T08:45:20Z&spr=https&sig=redacted"; 

    const base64 = "6xxxxx"
    const result = await submitData(fileName, base64, contentType, uploadUrl);
    console.log(`Upload result: ${result}`);
};

main().catch(console.error);

The above explain with submitData function converts the base64 string to a buffer, creates a ShareFileClient, and uploads the file using the uploadStream method. It returns true if the upload is successful, otherwise it returns false.

Output:

Upload successful
Upload result: true

The above code successfully uploaded the file, and when I clicked Download from the portal after uploading, it opened without any problems.

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