Cloudflare Developers•3mo ago

Metadata not being inserted - R2 Presigned URLs

hello, i've included metadata during the url presigning, but the uploaded file doesn't have custom metadata on r2 dashboard

  const command = new PutObjectCommand({
      Bucket: ENV_VARIABLES.R2.R2_BUCKET_NAME,
      Key: key,
      ContentLength: fileSizeInBytes,
      ContentType: contentType,
      ContentMD5: md5_checksum,
      CacheControl: "private, max-age=2592000", // 30 days
      Metadata: {
          "userr": "userr"
      }
  });
  return await getSignedUrl(FileStorage._s3Client, command, { expiresIn: expiresInSeconds });

  const command = new PutObjectCommand({
      Bucket: ENV_VARIABLES.R2.R2_BUCKET_NAME,
      Key: key,
      ContentLength: fileSizeInBytes,
      ContentType: contentType,
      ContentMD5: md5_checksum,
      CacheControl: "private, max-age=2592000", // 30 days
      Metadata: {
          "userr": "userr"
      }
  });
  return await getSignedUrl(FileStorage._s3Client, command, { expiresIn: expiresInSeconds });

e.g of presigned url

https://xxxx.xxxx.r2.cloudflarestorage.com/user%20b/testt.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=35f5366333f47becddfdad106108c512%2F20240821%2Fauto%2Fs3%2Faws4_request&X-Amz-Date=20240821T081129Z&X-Amz-Expires=600&X-Amz-Signature=27c05c8c21582732108d5caee42cbcbba1f43068547655729041445ad0509248&X-Amz-SignedHeaders=content-length%3Bcontent-md5%3Bhost&x-amz-meta-userr=userr&x-id=PutObject

https://xxxx.xxxx.r2.cloudflarestorage.com/user%20b/testt.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=35f5366333f47becddfdad106108c512%2F20240821%2Fauto%2Fs3%2Faws4_request&X-Amz-Date=20240821T081129Z&X-Amz-Expires=600&X-Amz-Signature=27c05c8c21582732108d5caee42cbcbba1f43068547655729041445ad0509248&X-Amz-SignedHeaders=content-length%3Bcontent-md5%3Bhost&x-amz-meta-userr=userr&x-id=PutObject

14 Replies

yuvrajOP•3mo ago

hello

harshil1712•3mo ago

You need to pass the meta data in the header as well. After you create the pre-signed URL this what you have to do:

const uploadRes = await fetch(PRESIGNED_URL, {
            method: "PUT",
            body: file,
            headers: {
              'x-amz-meta-userr":"userr"
            },
          });

const uploadRes = await fetch(PRESIGNED_URL, {
            method: "PUT",
            body: file,
            headers: {
              'x-amz-meta-userr":"userr"
            },
          });

yuvrajOP•3mo ago

I did add that header previously, but I get 403 http error

yuvrajOP•3mo ago

as soon as I comment that header, it works, but no metadata gets added ok I tested with direct uploads with PutObjectCommands without using presigned urls, and metadata works how do I make it work with presigned urls?

harshil1712•3mo ago

Hmm, that's interesting. I haven't tried it pre-signed URL yet. Let me try and get back to you

yuvrajOP•3mo ago

any updates?

harshil1712•3mo ago

I tried and running into issues. Asked for some intputs from the team

deletos•2mo ago

i am running into this as well

Flask•2mo ago

I run into the same issue months ago with the AWS SDK on AWS S3 (the product was not Cloudflare R2 but the SDK was the same I think), and after a research I thought the possible issue was about that the headers were not presigned properly. It was common at that moment, not sure if there is any workaround for now when it's necessary to use a presigned url.

deletos•3w ago

any updates for this issue?

harshil1712•3w ago

I learned that it has to do with the AWS SDK. Some of these SDKs don't work well enough to add Metadata. Alright, so I got something working. I'll upload the code on GitHub soon, but here's what you want to do:

const command = new PutObjectCommand({
                    Bucket: 'demos',
                    Key: filename,
                    ContentType: filetype,
                    Metadata: {
                        METADATA: 'John Doe',
                    },
                });
const signedUrl = await getSignedUrl(S3, command, { expiresIn: 3600, unhoistableHeaders: new Set(['x-amz-meta-METADATA']) });

const upload = await fetch(signedUrl, {
                    method: 'PUT',
                    body: file,
                    headers: {
                        'Content-Type': filetype,
                        'x-amz-meta-METADATA': 'John Doe',
                    },
                });

const command = new PutObjectCommand({
                    Bucket: 'demos',
                    Key: filename,
                    ContentType: filetype,
                    Metadata: {
                        METADATA: 'John Doe',
                    },
                });
const signedUrl = await getSignedUrl(S3, command, { expiresIn: 3600, unhoistableHeaders: new Set(['x-amz-meta-METADATA']) });

const upload = await fetch(signedUrl, {
                    method: 'PUT',
                    body: file,
                    headers: {
                        'Content-Type': filetype,
                        'x-amz-meta-METADATA': 'John Doe',
                    },
                });

Replace METADATA with your metadata key.

harshil1712•3w ago

Here's the repo: https://github.com/harshil1712/r2-pre-signed-upload-metadata

GitHub

GitHub - harshil1712/r2-pre-signed-upload-metadata: This project de...

This project demonstrates a Cloudflare Worker that handles file uploads to R2 storage using pre-signed URLs with custom metadata. - harshil1712/r2-pre-signed-upload-metadata

deletos•3w ago

this worked. thank you!

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Metadata not being inserted - R2 Presigned URLs