276 lines
21 KiB
HTML
276 lines
21 KiB
HTML
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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 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 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features</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html" class="active">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li></ol>
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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 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.</p>
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<h2 id="storage"><a class="header" href="#storage">Storage</a></h2>
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<p>Each item of media is assigned a <code>media_id</code> when it is uploaded.
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The <code>media_id</code> is a randomly chosen, URL safe 24 character string.</p>
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<p>Metadata such as the MIME type, upload time and length are stored in the
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sqlite3 database indexed by <code>media_id</code>.</p>
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<p>Content is stored on the filesystem under a <code>"local_content"</code> directory.</p>
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<p>Thumbnails are stored under a <code>"local_thumbnails"</code> directory.</p>
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<p>The item with <code>media_id</code> <code>"aabbccccccccdddddddddddd"</code> is stored under
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<code>"local_content/aa/bb/ccccccccdddddddddddd"</code>. Its thumbnail with width
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<code>128</code> and height <code>96</code> and type <code>"image/jpeg"</code> is stored under
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<code>"local_thumbnails/aa/bb/ccccccccdddddddddddd/128-96-image-jpeg"</code></p>
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<p>Remote content is cached under <code>"remote_content"</code> directory. Each item of
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remote content is assigned a local <code>"filesystem_id"</code> to ensure that the
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directory structure <code>"remote_content/server_name/aa/bb/ccccccccdddddddddddd"</code>
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is appropriate. Thumbnails for remote content are stored under
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