Stream raw file to upload (supabase-fetcher)

[zoedsoupe]

Problem

The Supabase.Fetcher.upload/4 function currently uses File.stream!/3 with encoding: :utf8 to read file contents during uploads. This causes issues when uploading non-UTF-8 files, such as binary files (e.g., MP3s), resulting in :invalid_unicode errors. Users have reported difficulties uploading files to Supabase Storage due to this limitation.

Additionally, the implementation does not dynamically determine the Content-Type header based on the file being uploaded, which can lead to incorrect file handling on the server.

References

• Storage-ex Issue: #2
• Code Reference: Supabase.Fetcher.upload/4 implementation

Solution

Refactor the Supabase.Fetcher.upload/4 function to address the following:

1. Remove UTF-8 Encoding:

   • Change File.stream!/3 to use the :raw option instead of :utf8, which ensures that binary files can be read without errors.

2. Determine MIME Type:

   • Use the library mime to detect the file's MIME type dynamically.

3. Set the Correct Content-Type Header:

   • Ensure that the MIME type is added to the request headers dynamically based on the file's type.

Rationale

1. File Encoding:
   • Removing the :utf8 encoding resolves errors when streaming binary files (e.g., MP3s, images).
   • The :raw option reads files as-is without attempting to interpret their content as a specific character set.

[zoedsoupe]

depends on #50