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  <section id="contacts-carddav">
<h1>Contacts / CardDAV<a class="headerlink" href="#contacts-carddav" title="Link to this heading"></a></h1>
<p>Nextcloud ships a CardDAV backend for users to store and share their address books and contacts.</p>
<section id="system-address-book">
<span id="id1"></span><h2>System Address Book<a class="headerlink" href="#system-address-book" title="Link to this heading"></a></h2>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 27: </span>The system address book is now accessible to all Nextcloud users</p>
</div>
<p>Nextcloud maintains a read-only address book containing contact information of all users of the instance.</p>
<p>Disabled users are removed from this address book.</p>
<p>You can disable access to the system address book by using the app config value <code class="docutils literal notranslate"><span class="pre">system_addressbook_exposed</span></code>.</p>
<p>Run <code class="docutils literal notranslate"><span class="pre">occ</span> <span class="pre">config:app:set</span> <span class="pre">dav</span> <span class="pre">system_addressbook_exposed</span> <span class="pre">--value=&quot;no&quot;</span></code> to disable access to the system address book for all users. Please note that this does not influence <a class="reference internal" href="../configuration_files/federated_cloud_sharing_configuration.html#label-direct-share-link"><span class="std std-ref">Federated sharing</span></a>.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>If clients have already connected to the CalDAV endpoint, the clients might experience sync issues after system address book access was disabled. This can often be remedied by choosing a different default address book on the client and forcing a resync.</p>
</div>
<section id="privacy-and-user-property-scopes">
<h3>Privacy and User Property Scopes<a class="headerlink" href="#privacy-and-user-property-scopes" title="Link to this heading"></a></h3>
<p>Contact information in the system address book is taken from users’ <a class="reference internal" href="../configuration_user/profile_configuration.html#profile"><span class="std std-ref">profile information</span></a>. Profile properties are only written to the system contact if the <a class="reference internal" href="../configuration_user/profile_configuration.html#profile-property-scopes"><span class="std std-ref">scope</span></a> is set to <em>Local</em> or higher.</p>
<p>Users who set all their property scopes to <em>Private</em> are removed from the system address book and therefore not seen by other users.</p>
<p><a class="reference internal" href="../configuration_files/file_sharing_configuration.html#file-sharing-configuration"><span class="std std-ref">File sharing settings</span></a> controls the enumeration of other users.</p>
<ul class="simple">
<li><p>If username autocompletion is not allowed, the system address book will only show user’s own system contact but no other contacts.</p></li>
<li><p>If username autocompletion is allowed, users will see contact cards for all other users.</p>
<ul>
<li><p>If autocompletion is limited to users within the same groups, users will see contact cards for other users in shared groups.</p></li>
<li><p>If autocompletion is limited to matching phone numbers, the system address book will only show user’s own system contact but no other contacts.</p></li>
<li><p>If autocompletion is limited to users within the same groups <strong>and</strong> matching phone numbers, users will see contact cards for other users in shared groups.</p></li>
</ul>
</li>
</ul>
</section>
<section id="address-book-sync">
<h3>Address Book Sync<a class="headerlink" href="#address-book-sync" title="Link to this heading"></a></h3>
<p>The address book is updated automatically with every added, modified, disabled or removed user. Admins can also trigger a full rewrite of the address book <a class="reference internal" href="../configuration_server/occ_command.html#occ-dav-sync-system-address-book"><span class="std std-ref">with occ</span></a>.</p>
</section>
</section>
<section id="shared-items">
<h2>Shared items<a class="headerlink" href="#shared-items" title="Link to this heading"></a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 5.5.0.</span></p>
</div>
<p>For this feature, the shipped <a class="reference external" href="https://apps.nextcloud.com/apps/related_resources">related resources app</a> needs to be enabled.</p>
</section>
<section id="rate-limits">
<h2>Rate limits<a class="headerlink" href="#rate-limits" title="Link to this heading"></a></h2>
<p>Nextcloud rate limits the creation of address books and how many can be created in a short period of time. The default is 10 address books per hour. This can be customized as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Set limit to 15 items per 30 minutes</span>
<span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">app</span><span class="p">:</span><span class="nb">set</span> <span class="n">dav</span> <span class="n">rateLimitAddressBookCreation</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="n">integer</span> <span class="o">--</span><span class="n">value</span><span class="o">=</span><span class="mi">15</span>
<span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">app</span><span class="p">:</span><span class="nb">set</span> <span class="n">dav</span> <span class="n">rateLimitPeriodAddressBookCreation</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="n">integer</span> <span class="o">--</span><span class="n">value</span><span class="o">=</span><span class="mi">1800</span>
</pre></div>
</div>
<p>Additionally, the maximum number of address books a user may create is limited to 10 items. This can be customized too:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Allow users to create 50 addressbooks</span>
<span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">app</span><span class="p">:</span><span class="nb">set</span> <span class="n">dav</span> <span class="n">maximumAdressbooks</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="n">integer</span> <span class="o">--</span><span class="n">value</span><span class="o">=</span><span class="mi">50</span>
</pre></div>
</div>
<p>or:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Allow users to create address books without restriction</span>
<span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">app</span><span class="p">:</span><span class="nb">set</span> <span class="n">dav</span> <span class="n">maximumAdressbooks</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="n">integer</span> <span class="o">--</span><span class="n">value</span><span class="o">=-</span><span class="mi">1</span>
</pre></div>
</div>
</section>
</section>


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