[Matrix] Phase 1: Media Handling

[alacy-centrl]

Overview

Implement media upload/download support for Matrix adapter using the MediaStore pattern.

Tasks

• Implement Matrix media download (GET /_matrix/client/v1/media/download)
• Implement Matrix media upload (POST /_matrix/media/v3/upload)
• Handle mxc:// URI conversion
• Support image, audio, and file attachments
• Integrate with existing MediaStore
• Add media size validation
• Handle Matrix homeserver-specific limits

Acceptance Criteria

• Can download media from Matrix rooms
• Can upload and send media to Matrix rooms
• Media cached in MediaStore
• Handles various media types (images, audio, files)
• Graceful error handling for failed uploads/downloads

Estimated Time

1 day

Dependencies

• Issue [Matrix] Phase 1: Core Adapter Implementation #779 (Core Adapter)

Technical Details

• Matrix uses mxc:// URIs for media
• Download requires authentication
• Upload returns mxc:// URI for inclusion in messages
• Media stored in homeserver, not as file IDs

See full plan: https://github.com/users/alacy-centrl/projects/2

[alacy-centrl]

Phase 1 media handling complete (integrated into core adapter) ✅

[alacy-centrl]

I apologize for opening these issues in the wrong repository. These Matrix integration issues should have been created in my personal fork. I'm closing this issue and moving it to alacy-centrl#11

Sorry for the confusion!