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< h1 id = "media-repository" > < a class = "header" href = "#media-repository" > Media Repository< / a > < / h1 >
< p > < em > Synapse implementation-specific details for the media repository< / em > < / p >
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< p > The media repository< / p >
< ul >
< li > stores avatars, attachments and their thumbnails for media uploaded by local
users.< / li >
< li > caches avatars, attachments and their thumbnails for media uploaded by remote
users.< / li >
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< li > caches resources and thumbnails used for URL previews.< / li >
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< p > All media in Matrix can be identified by a unique
< a href = "https://spec.matrix.org/latest/client-server-api/#matrix-content-mxc-uris" > MXC URI< / a > ,
consisting of a server name and media ID:< / p >
< pre > < code > mxc://< server-name> /< media-id>
< / code > < / pre >
< h2 id = "local-media" > < a class = "header" href = "#local-media" > Local Media< / a > < / h2 >
< p > Synapse generates 24 character media IDs for content uploaded by local users.
These media IDs consist of upper and lowercase letters and are case-sensitive.
Other homeserver implementations may generate media IDs differently.< / p >
< p > Local media is recorded in the < code > local_media_repository< / code > table, which includes
metadata such as MIME types, upload times and file sizes.
Note that this table is shared by the URL cache, which has a different media ID
scheme.< / p >
< h3 id = "paths" > < a class = "header" href = "#paths" > Paths< / a > < / h3 >
< p > A file with media ID < code > aabbcccccccccccccccccccc< / code > and its < code > 128x96< / code > < code > image/jpeg< / code >
thumbnail, created by scaling, would be stored at:< / p >
< pre > < code > local_content/aa/bb/cccccccccccccccccccc
local_thumbnails/aa/bb/cccccccccccccccccccc/128-96-image-jpeg-scale
< / code > < / pre >
< h2 id = "remote-media" > < a class = "header" href = "#remote-media" > Remote Media< / a > < / h2 >
< p > When media from a remote homeserver is requested from Synapse, it is assigned
a local < code > filesystem_id< / code > , with the same format as locally-generated media IDs,
as described above.< / p >
< p > A record of remote media is stored in the < code > remote_media_cache< / code > table, which
can be used to map remote MXC URIs (server names and media IDs) to local
< code > filesystem_id< / code > s.< / p >
< h3 id = "paths-1" > < a class = "header" href = "#paths-1" > Paths< / a > < / h3 >
< p > A file from < code > matrix.org< / code > with < code > filesystem_id< / code > < code > aabbcccccccccccccccccccc< / code > and its
< code > 128x96< / code > < code > image/jpeg< / code > thumbnail, created by scaling, would be stored at:< / p >
< pre > < code > remote_content/matrix.org/aa/bb/cccccccccccccccccccc
remote_thumbnail/matrix.org/aa/bb/cccccccccccccccccccc/128-96-image-jpeg-scale
< / code > < / pre >
< p > Older thumbnails may omit the thumbnailing method:< / p >
< pre > < code > remote_thumbnail/matrix.org/aa/bb/cccccccccccccccccccc/128-96-image-jpeg
< / code > < / pre >
< p > Note that < code > remote_thumbnail/< / code > does not have an < code > s< / code > .< / p >
< h2 id = "url-previews" > < a class = "header" href = "#url-previews" > URL Previews< / a > < / h2 >
< p > When generating previews for URLs, Synapse may download and cache various
resources, including images. These resources are assigned temporary media IDs
of the form < code > yyyy-mm-dd_aaaaaaaaaaaaaaaa< / code > , where < code > yyyy-mm-dd< / code > is the current
date and < code > aaaaaaaaaaaaaaaa< / code > is a random sequence of 16 case-sensitive letters.< / p >
< p > The metadata for these cached resources is stored in the
< code > local_media_repository< / code > and < code > local_media_repository_url_cache< / code > tables.< / p >
< p > Resources for URL previews are deleted after a few days.< / p >
< h3 id = "paths-2" > < a class = "header" href = "#paths-2" > Paths< / a > < / h3 >
< p > The file with media ID < code > yyyy-mm-dd_aaaaaaaaaaaaaaaa< / code > and its < code > 128x96< / code >
< code > image/jpeg< / code > thumbnail, created by scaling, would be stored at:< / p >
< pre > < code > url_cache/yyyy-mm-dd/aaaaaaaaaaaaaaaa
url_cache_thumbnails/yyyy-mm-dd/aaaaaaaaaaaaaaaa/128-96-image-jpeg-scale
< / code > < / pre >
2021-07-07 12:44:14 +03:00
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