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watcha-synapse/docs/media_repository.md

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Media Repository

Synapse implementation-specific details for the media repository

The media repository is where attachments and avatar photos are stored. It stores attachment content and thumbnails for media uploaded by local users. It caches attachment content and thumbnails for media uploaded by remote users.

Storage

Each item of media is assigned a media_id when it is uploaded. The media_id is a randomly chosen, URL safe 24 character string.

Metadata such as the MIME type, upload time and length are stored in the sqlite3 database indexed by media_id.

Content is stored on the filesystem under a "local_content" directory.

Thumbnails are stored under a "local_thumbnails" directory.

The item with media_id "aabbccccccccdddddddddddd" is stored under "local_content/aa/bb/ccccccccdddddddddddd". Its thumbnail with width 128 and height 96 and type "image/jpeg" is stored under "local_thumbnails/aa/bb/ccccccccdddddddddddd/128-96-image-jpeg"

Remote content is cached under "remote_content" directory. Each item of remote content is assigned a local "filesystem_id" to ensure that the directory structure "remote_content/server_name/aa/bb/ccccccccdddddddddddd" is appropriate. Thumbnails for remote content are stored under "remote_thumbnails/server_name/..."