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265 lines
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HTML
265 lines
26 KiB
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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="federate.html">Federation</a></li><li class="chapter-item expanded "><a href="usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="templates.html">Templates</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></li><li class="chapter-item expanded "><a href="sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="jwt.html">JSON Web Tokens</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item
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<h1 id="media-repository"><a class="header" href="#media-repository">Media Repository</a></h1>
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<p><em>Synapse implementation-specific details for the media repository</em></p>
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<p>The media repository</p>
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<ul>
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<li>stores avatars, attachments and their thumbnails for media uploaded by local
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users.</li>
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<li>caches avatars, attachments and their thumbnails for media uploaded by remote
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users.</li>
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<li>caches resources and thumbnails used for URL previews.</li>
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</ul>
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<p>All media in Matrix can be identified by a unique
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<a href="https://spec.matrix.org/latest/client-server-api/#matrix-content-mxc-uris">MXC URI</a>,
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consisting of a server name and media ID:</p>
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<pre><code>mxc://<server-name>/<media-id>
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</code></pre>
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<h2 id="local-media"><a class="header" href="#local-media">Local Media</a></h2>
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<p>Synapse generates 24 character media IDs for content uploaded by local users.
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These media IDs consist of upper and lowercase letters and are case-sensitive.
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Other homeserver implementations may generate media IDs differently.</p>
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<p>Local media is recorded in the <code>local_media_repository</code> table, which includes
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metadata such as MIME types, upload times and file sizes.
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Note that this table is shared by the URL cache, which has a different media ID
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scheme.</p>
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<h3 id="paths"><a class="header" href="#paths">Paths</a></h3>
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<p>A file with media ID <code>aabbcccccccccccccccccccc</code> and its <code>128x96</code> <code>image/jpeg</code>
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thumbnail, created by scaling, would be stored at:</p>
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<pre><code>local_content/aa/bb/cccccccccccccccccccc
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local_thumbnails/aa/bb/cccccccccccccccccccc/128-96-image-jpeg-scale
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</code></pre>
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<h2 id="remote-media"><a class="header" href="#remote-media">Remote Media</a></h2>
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<p>When media from a remote homeserver is requested from Synapse, it is assigned
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a local <code>filesystem_id</code>, with the same format as locally-generated media IDs,
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as described above.</p>
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<p>A record of remote media is stored in the <code>remote_media_cache</code> table, which
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can be used to map remote MXC URIs (server names and media IDs) to local
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<code>filesystem_id</code>s.</p>
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<h3 id="paths-1"><a class="header" href="#paths-1">Paths</a></h3>
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<p>A file from <code>matrix.org</code> with <code>filesystem_id</code> <code>aabbcccccccccccccccccccc</code> and its
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<code>128x96</code> <code>image/jpeg</code> thumbnail, created by scaling, would be stored at:</p>
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<pre><code>remote_content/matrix.org/aa/bb/cccccccccccccccccccc
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remote_thumbnail/matrix.org/aa/bb/cccccccccccccccccccc/128-96-image-jpeg-scale
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</code></pre>
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<p>Older thumbnails may omit the thumbnailing method:</p>
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<pre><code>remote_thumbnail/matrix.org/aa/bb/cccccccccccccccccccc/128-96-image-jpeg
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</code></pre>
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<p>Note that <code>remote_thumbnail/</code> does not have an <code>s</code>.</p>
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<h2 id="url-previews"><a class="header" href="#url-previews">URL Previews</a></h2>
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<p>When generating previews for URLs, Synapse may download and cache various
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resources, including images. These resources are assigned temporary media IDs
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of the form <code>yyyy-mm-dd_aaaaaaaaaaaaaaaa</code>, where <code>yyyy-mm-dd</code> is the current
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date and <code>aaaaaaaaaaaaaaaa</code> is a random sequence of 16 case-sensitive letters.</p>
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<p>The metadata for these cached resources is stored in the
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<code>local_media_repository</code> and <code>local_media_repository_url_cache</code> tables.</p>
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<p>Resources for URL previews are deleted after a few days.</p>
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<h3 id="paths-2"><a class="header" href="#paths-2">Paths</a></h3>
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<p>The file with media ID <code>yyyy-mm-dd_aaaaaaaaaaaaaaaa</code> and its <code>128x96</code>
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<code>image/jpeg</code> thumbnail, created by scaling, would be stored at:</p>
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<pre><code>url_cache/yyyy-mm-dd/aaaaaaaaaaaaaaaa
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url_cache_thumbnails/yyyy-mm-dd/aaaaaaaaaaaaaaaa/128-96-image-jpeg-scale
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</code></pre>
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<script src="searcher.js" type="text/javascript" charset="utf-8"></script>
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