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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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<h1 id="user-directory-api-implementation"><a class="header" href="#user-directory-api-implementation">User Directory API Implementation</a></h1>
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<p>The user directory is currently maintained based on the 'visible' users
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on this particular server - i.e. ones which your account shares a room with, or
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who are present in a publicly viewable room present on the server.</p>
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<p>The directory info is stored in various tables, which can (typically after
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DB corruption) get stale or out of sync. If this happens, for now the
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solution to fix it is to use the <a href="usage/administration/admin_api/background_updates.html#run">admin API</a>
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and execute the job <code>regenerate_directory</code>. This should then start a background task to
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flush the current tables and regenerate the directory.</p>
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<h2 id="data-model"><a class="header" href="#data-model">Data model</a></h2>
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<p>There are five relevant tables that collectively form the "user directory".
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Three of them track a master list of all the users we could search for.
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The last two (collectively called the "search tables") track who can
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see who.</p>
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<p>From all of these tables we exclude three types of local user:</p>
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<ul>
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<li>support users</li>
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<li>appservice users</li>
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<li>deactivated users</li>
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</ul>
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<ul>
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<li>
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<p><code>user_directory</code>. This contains the user_id, display name and avatar we'll
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return when you search the directory.</p>
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<ul>
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<li>Because there's only one directory entry per user, it's important that we only
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ever put publicly visible names here. Otherwise we might leak a private
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nickname or avatar used in a private room.</li>
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<li>Indexed on rooms. Indexed on users.</li>
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</ul>
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</li>
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<li>
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<p><code>user_directory_search</code>. To be joined to <code>user_directory</code>. It contains an extra
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column that enables full text search based on user ids and display names.
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Different schemas for SQLite and Postgres with different code paths to match.</p>
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<ul>
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<li>Indexed on the full text search data. Indexed on users.</li>
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</ul>
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</li>
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<li>
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<p><code>user_directory_stream_pos</code>. When the initial background update to populate
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the directory is complete, we record a stream position here. This indicates
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that synapse should now listen for room changes and incrementally update
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the directory where necessary.</p>
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</li>
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<li>
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<p><code>users_in_public_rooms</code>. Contains associations between users and the public rooms they're in.
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Used to determine which users are in public rooms and should be publicly visible in the directory.</p>
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</li>
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<li>
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<p><code>users_who_share_private_rooms</code>. Rows are triples <code>(L, M, room id)</code> where <code>L</code>
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is a local user and <code>M</code> is a local or remote user. <code>L</code> and <code>M</code> should be
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different, but this isn't enforced by a constraint.</p>
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