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diff --git a/docs/media_repository.rst b/docs/media_repository.rst new file mode 100644 index 0000000000..e554d0f495 --- /dev/null +++ b/docs/media_repository.rst @@ -0,0 +1,20 @@ +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 "content" directory. Thumbnails are +stored under a "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"`` |