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diff --git a/docs/media_repository.rst b/docs/media_repository.rst new file mode 100644 index 0000000000..e4a6974041 --- /dev/null +++ b/docs/media_repository.rst @@ -0,0 +1,25 @@ +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/..."`` |