Cloudflare R2 client initialization fails for EU region buckets due to incorrect endpoint URL

[muhammadzadeh]

📜 Description

The application uses Cloudflare R2 for file uploads via the AWS S3 SDK. The R2 client is initialized with a hardcoded endpoint URL that only works for US/default region buckets. When a bucket is created in the EU region, all upload operations fail because the endpoint URL format is different.

Technical Details :

• The endpoint is hardcoded in libraries/nestjs-libraries/src/upload/r2.uploader.ts (line 26)
• Current endpoint: https://${CLOUDFLARE_ACCOUNT_ID}.r2.cloudflarestorage.com
• Required EU endpoint: https://${CLOUDFLARE_ACCOUNT_ID}.eu.r2.cloudflare.com
• This affects all R2 operations: simple uploads, multipart uploads, presigned URLs, etc.

👟 Reproduction steps

1. Set up Cloudflare R2 bucket in EU region:

• Create a Cloudflare R2 bucket with jurisdiction set to "EU"
• Note your Account ID, Access Key, and Secret Access Key

2. Configure the application environment variables:

• CLOUDFLARE_ACCOUNT_ID=your_account_id
• CLOUDFLARE_ACCESS_KEY=your_access_key
• CLOUDFLARE_SECRET_ACCESS_KEY=your_secret_key
• CLOUDFLARE_BUCKETNAME=your_eu_bucket_name
• CLOUDFLARE_BUCKET_URL=https://your-public-url.r2.cloudflarestorage.com

3. Attempt to upload a file:

• Start the application
• Navigate to any upload functionality (e.g., media upload, profile picture, etc.)
• Select a file and attempt to upload
• Observe the upload fails

4. Check the application logs:

• Look for error messages related to R2/S3 operations
• Errors is NoSuchBucket: The specified bucket does not exist.

👍 Expected behavior

• The file upload should succeed regardless of the bucket region (US, EU, APAC, etc.)
• The S3 client should connect to the correct regional endpoint
• Upload operations (simple upload, multipart upload, presigned URLs) should work correctly
• Users should see a success message and the uploaded file should be accessible
• The application should return the correct file URL

👎 Actual Behavior with Screenshots

• Upload operations fail for EU region buckets
• The S3 client attempts to connect to https://{account_id}.r2.cloudflarestorage.com (default endpoint)
• Connection fails or returns authentication/access errors because the bucket exists on the EU endpoint
• Error messages in console logs show S3/R2 operation failures
• Users see upload error messages or timeouts
• Files are not uploaded to R2

💻 Operating system

Linux

🤖 Node Version

22.20-alpine

📃 Provide any additional context for the Bug.

No response

👀 Have you spent some time to check if this bug has been raised before?

• I checked and didn't find similar issue

Are you willing to submit PR?

Yes I am willing to submit a PR!