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27 lines
1.3 KiB
ReStructuredText
27 lines
1.3 KiB
ReStructuredText
Media Repository
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================
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*Synapse implementation-specific details for the media repository*
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The media repository is where attachments and avatar photos are stored.
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It stores attachment content and thumbnails for media uploaded by local users.
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It caches attachment content and thumbnails for media uploaded by remote users.
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Storage
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-------
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Each item of media is assigned a ``media_id`` when it is uploaded.
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The ``media_id`` is a randomly chosen, URL safe 24 character string.
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Metadata such as the MIME type, upload time and length are stored in the
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sqlite3 database indexed by ``media_id``.
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Content is stored on the filesystem under a ``"local_content"`` directory.
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Thumbnails are stored under a ``"local_thumbnails"`` directory.
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The item with ``media_id`` ``"aabbccccccccdddddddddddd"`` is stored under
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``"local_content/aa/bb/ccccccccdddddddddddd"``. Its thumbnail with width
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``128`` and height ``96`` and type ``"image/jpeg"`` is stored under
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``"local_thumbnails/aa/bb/ccccccccdddddddddddd/128-96-image-jpeg"``
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Remote content is cached under ``"remote_content"`` directory. Each item of
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remote content is assigned a local "``filesystem_id``" to ensure that the
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directory structure ``"remote_content/server_name/aa/bb/ccccccccdddddddddddd"``
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is appropriate. Thumbnails for remote content are stored under
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``"remote_thumbnails/server_name/..."``
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