Franceska Hoxha•7mo ago

Uploading Files to S3 Bucket usign deno-s3-lite-client

Hello, I have been trying to make a file upload controller with deno's s3 lite client but I am facing an issue with uploading the content type of my file. In their documentation, i can read that the way to use the putObject() fucntion is like this:

Deno.test({
  name: "putObject() can stream a large file upload",
  fn: async () => {
    // First generate a 32MiB file in memory, 1 MiB at a time, as a stream
    const dataStream = ReadableStream.from(async function* () {
      for (let i = 0; i < 32; i++) {
        yield new Uint8Array(1024 * 1024).fill(i % 256); // Yield 1MB of data
      }
    }());
    const key = "test-32m.dat";
    const metadata = { "Content-Type": "test/streaming", "x-amz-meta-custom-header": "This is a custom value!" };
    const response = await client.putObject(key, dataStream, { partSize: 5 * 1024 * 1024, metadata });
    
    assertEquals(response.etag, "ca6d977b6e7dc87ab5c5892e124c7277-7");

    const stat = await client.statObject(key);
    assertEquals(stat.metadata, metadata);
  },
});

And in my code I have it like this:


  try {
        // Read the file as an ArrayBuffer
        const buffer = await fileData.arrayBuffer();
        // Convert ArrayBuffer to Uint8Array
        const fileArrayBuffer = new Uint8Array(buffer);

     ("Uploading file to S3 with filePath:", filePath);

        // Use contentType option to set the Content-Type header directly
        const metadata = {
            "Content-Type": fileData.type,
        };
        // Upload the file using the S3 client
        await s3Client.putObject(filePath, fileArrayBuffer, { metadata});
        console.log("Upload successful");

        // Verify the uploaded file's metadata
        const stat = await s3Client.statObject(filePath);
        console.log("Uploaded file metadata:", stat.metadata);

        return filePath;

Can you tell where the problem is from here?

3 Replies

Deno AI Helper•7mo ago

I wasn't able to find the answer to your question in the official Deno documentation. However, based on the code snippet you provided, there is a syntax error in your logging statement. The line:

("Uploading file to S3 with filePath:", filePath);

("Uploading file to S3 with filePath:", filePath);

appears to be missing a console.log or similar logging function. It should be:

console.log("Uploading file to S3 with filePath:", filePath);

console.log("Uploading file to S3 with filePath:", filePath);

Please note that this advice is not based on the Deno documentation, and I would advise you to double-check the accuracy of the advice given. If the issue persists after correcting the syntax error, you may want to review the deno-s3-lite-client documentation or source code for more details on how to use the putObject method correctly, especially regarding setting the content type in the metadata.

Helpful Links: A list of every web API in Deno Deno 1.7 Release Notes Streaming File Operations - Deno by Example Deno: the easiest, most secure JavaScript runtime | Deno Docs Deno 1.19 Release Notes Writing Files - Deno by Example Reading Files - Deno by Example

jordanbtucker•7mo ago

Are you getting any error messages?

Franceska HoxhaOP•7mo ago

No error messages, just the fike uploaded successfully but not with the type filed. So when i try to open it, it wont open becase it doesnt have a type