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authorclokep <clokep@users.noreply.github.com>2021-09-21 16:33:10 +0000
committerclokep <clokep@users.noreply.github.com>2021-09-21 16:33:10 +0000
commitc0fd778fd47bde855bd9aa9f185afec2c3bc247e (patch)
tree7ddf9596f5f3365d4ddec53f2313c322da4b6f2a
parentdeploy: ba7a91aea5fd624bf048f0fda0dca80da7a1945e (diff)
downloadsynapse-c0fd778fd47bde855bd9aa9f185afec2c3bc247e.tar.xz
deploy: ebd8baf61ff8e00f8de3b63c00531765672000c8
-rw-r--r--develop/admin_api/purge_room.html268
-rw-r--r--develop/admin_api/shutdown_room.html343
-rw-r--r--develop/dev/cas.html317
-rw-r--r--develop/dev/git.html376
-rw-r--r--develop/dev/git/branches.jpgbin72228 -> 0 bytes
-rw-r--r--develop/dev/git/clean.pngbin110840 -> 0 bytes
-rw-r--r--develop/dev/git/squash.pngbin29667 -> 0 bytes
-rw-r--r--develop/dev/saml.html294
-rw-r--r--develop/modules.html555
-rw-r--r--develop/presence_router_module.html461
-rw-r--r--develop/spam_checker.html360
-rw-r--r--develop/url_previews.html365
12 files changed, 0 insertions, 3339 deletions
diff --git a/develop/admin_api/purge_room.html b/develop/admin_api/purge_room.html
deleted file mode 100644
index 26fba8ff11..0000000000
--- a/develop/admin_api/purge_room.html
+++ /dev/null
@@ -1,268 +0,0 @@
-<!DOCTYPE HTML>
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-                        <h1 id="deprecated-purge-room-api"><a class="header" href="#deprecated-purge-room-api">Deprecated: Purge room API</a></h1>
-<p><strong>The old Purge room API is deprecated and will be removed in a future release.
-See the new <a href="rooms.html#delete-room-api">Delete Room API</a> for more details.</strong></p>
-<p>This API will remove all trace of a room from your database.</p>
-<p>All local users must have left the room before it can be removed.</p>
-<p>The API is:</p>
-<pre><code>POST /_synapse/admin/v1/purge_room
-
-{
-    &quot;room_id&quot;: &quot;!room:id&quot;
-}
-</code></pre>
-<p>You must authenticate using the access token of an admin user.</p>
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diff --git a/develop/admin_api/shutdown_room.html b/develop/admin_api/shutdown_room.html
deleted file mode 100644
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--- a/develop/admin_api/shutdown_room.html
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-                        <h1 id="deprecated-shutdown-room-api"><a class="header" href="#deprecated-shutdown-room-api">Deprecated: Shutdown room API</a></h1>
-<p><strong>The old Shutdown room API is deprecated and will be removed in a future release.
-See the new <a href="rooms.html#delete-room-api">Delete Room API</a> for more details.</strong></p>
-<p>Shuts down a room, preventing new joins and moves local users and room aliases automatically
-to a new room. The new room will be created with the user specified by the
-<code>new_room_user_id</code> parameter as room administrator and will contain a message
-explaining what happened. Users invited to the new room will have power level
--10 by default, and thus be unable to speak. The old room's power levels will be changed to
-disallow any further invites or joins.</p>
-<p>The local server will only have the power to move local user and room aliases to
-the new room. Users on other servers will be unaffected.</p>
-<h2 id="api"><a class="header" href="#api">API</a></h2>
-<p>You will need to authenticate with an access token for an admin user.</p>
-<h3 id="url"><a class="header" href="#url">URL</a></h3>
-<p><code>POST /_synapse/admin/v1/shutdown_room/{room_id}</code></p>
-<h3 id="url-parameters"><a class="header" href="#url-parameters">URL Parameters</a></h3>
-<ul>
-<li><code>room_id</code> - The ID of the room (e.g <code>!someroom:example.com</code>)</li>
-</ul>
-<h3 id="json-body-parameters"><a class="header" href="#json-body-parameters">JSON Body Parameters</a></h3>
-<ul>
-<li><code>new_room_user_id</code> - Required. A string representing the user ID of the user that will admin
-the new room that all users in the old room will be moved to.</li>
-<li><code>room_name</code> - Optional. A string representing the name of the room that new users will be
-invited to.</li>
-<li><code>message</code> - Optional. A string containing the first message that will be sent as
-<code>new_room_user_id</code> in the new room. Ideally this will clearly convey why the
-original room was shut down.</li>
-</ul>
-<p>If not specified, the default value of <code>room_name</code> is &quot;Content Violation
-Notification&quot;. The default value of <code>message</code> is &quot;Sharing illegal content on
-othis server is not permitted and rooms in violation will be blocked.&quot;</p>
-<h3 id="response-parameters"><a class="header" href="#response-parameters">Response Parameters</a></h3>
-<ul>
-<li><code>kicked_users</code> - An integer number representing the number of users that
-were kicked.</li>
-<li><code>failed_to_kick_users</code> - An integer number representing the number of users
-that were not kicked.</li>
-<li><code>local_aliases</code> - An array of strings representing the local aliases that were migrated from
-the old room to the new.</li>
-<li><code>new_room_id</code> - A string representing the room ID of the new room.</li>
-</ul>
-<h2 id="example"><a class="header" href="#example">Example</a></h2>
-<p>Request:</p>
-<pre><code>POST /_synapse/admin/v1/shutdown_room/!somebadroom%3Aexample.com
-
-{
-    &quot;new_room_user_id&quot;: &quot;@someuser:example.com&quot;,
-    &quot;room_name&quot;: &quot;Content Violation Notification&quot;,
-    &quot;message&quot;: &quot;Bad Room has been shutdown due to content violations on this server. Please review our Terms of Service.&quot;
-}
-</code></pre>
-<p>Response:</p>
-<pre><code>{
-    &quot;kicked_users&quot;: 5,
-    &quot;failed_to_kick_users&quot;: 0,
-    &quot;local_aliases&quot;: [&quot;#badroom:example.com&quot;, &quot;#evilsaloon:example.com],
-    &quot;new_room_id&quot;: &quot;!newroomid:example.com&quot;,
-},
-</code></pre>
-<h2 id="undoing-room-shutdowns"><a class="header" href="#undoing-room-shutdowns">Undoing room shutdowns</a></h2>
-<p><em>Note</em>: This guide may be outdated by the time you read it. By nature of room shutdowns being performed at the database level,
-the structure can and does change without notice.</p>
-<p>First, it's important to understand that a room shutdown is very destructive. Undoing a shutdown is not as simple as pretending it
-never happened - work has to be done to move forward instead of resetting the past. In fact, in some cases it might not be possible
-to recover at all:</p>
-<ul>
-<li>If the room was invite-only, your users will need to be re-invited.</li>
-<li>If the room no longer has any members at all, it'll be impossible to rejoin.</li>
-<li>The first user to rejoin will have to do so via an alias on a different server.</li>
-</ul>
-<p>With all that being said, if you still want to try and recover the room:</p>
-<ol>
-<li>For safety reasons, shut down Synapse.</li>
-<li>In the database, run <code>DELETE FROM blocked_rooms WHERE room_id = '!example:example.org';</code>
-<ul>
-<li>For caution: it's recommended to run this in a transaction: <code>BEGIN; DELETE ...;</code>, verify you got 1 result, then <code>COMMIT;</code>.</li>
-<li>The room ID is the same one supplied to the shutdown room API, not the Content Violation room.</li>
-</ul>
-</li>
-<li>Restart Synapse.</li>
-</ol>
-<p>You will have to manually handle, if you so choose, the following:</p>
-<ul>
-<li>Aliases that would have been redirected to the Content Violation room.</li>
-<li>Users that would have been booted from the room (and will have been force-joined to the Content Violation room).</li>
-<li>Removal of the Content Violation room if desired.</li>
-</ul>
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-                        <h1 id="how-to-test-cas-as-a-developer-without-a-server"><a class="header" href="#how-to-test-cas-as-a-developer-without-a-server">How to test CAS as a developer without a server</a></h1>
-<p>The <a href="https://github.com/jbittel/django-mama-cas">django-mama-cas</a> project is an
-easy to run CAS implementation built on top of Django.</p>
-<h2 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h2>
-<ol>
-<li>Create a new virtualenv: <code>python3 -m venv &lt;your virtualenv&gt;</code></li>
-<li>Activate your virtualenv: <code>source /path/to/your/virtualenv/bin/activate</code></li>
-<li>Install Django and django-mama-cas:
-<pre><code>python -m pip install &quot;django&lt;3&quot; &quot;django-mama-cas==2.4.0&quot;
-</code></pre>
-</li>
-<li>Create a Django project in the current directory:
-<pre><code>django-admin startproject cas_test .
-</code></pre>
-</li>
-<li>Follow the <a href="https://django-mama-cas.readthedocs.io/en/latest/installation.html#configuring">install directions</a> for django-mama-cas</li>
-<li>Setup the SQLite database: <code>python manage.py migrate</code></li>
-<li>Create a user:
-<pre><code>python manage.py createsuperuser
-</code></pre>
-<ol>
-<li>Use whatever you want as the username and password.</li>
-<li>Leave the other fields blank.</li>
-</ol>
-</li>
-<li>Use the built-in Django test server to serve the CAS endpoints on port 8000:
-<pre><code>python manage.py runserver
-</code></pre>
-</li>
-</ol>
-<p>You should now have a Django project configured to serve CAS authentication with
-a single user created.</p>
-<h2 id="configure-synapse-and-element-to-use-cas"><a class="header" href="#configure-synapse-and-element-to-use-cas">Configure Synapse (and Element) to use CAS</a></h2>
-<ol>
-<li>Modify your <code>homeserver.yaml</code> to enable CAS and point it to your locally
-running Django test server:
-<pre><code class="language-yaml">cas_config:
-  enabled: true
-  server_url: &quot;http://localhost:8000&quot;
-  service_url: &quot;http://localhost:8081&quot;
-  #displayname_attribute: name
-  #required_attributes:
-  #    name: value
-</code></pre>
-</li>
-<li>Restart Synapse.</li>
-</ol>
-<p>Note that the above configuration assumes the homeserver is running on port 8081
-and that the CAS server is on port 8000, both on localhost.</p>
-<h2 id="testing-the-configuration"><a class="header" href="#testing-the-configuration">Testing the configuration</a></h2>
-<p>Then in Element:</p>
-<ol>
-<li>Visit the login page with a Element pointing at your homeserver.</li>
-<li>Click the Single Sign-On button.</li>
-<li>Login using the credentials created with <code>createsuperuser</code>.</li>
-<li>You should be logged in.</li>
-</ol>
-<p>If you want to repeat this process you'll need to manually logout first:</p>
-<ol>
-<li>http://localhost:8000/admin/</li>
-<li>Click &quot;logout&quot; in the top right.</li>
-</ol>
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-                        <h1 id="some-notes-on-how-we-use-git"><a class="header" href="#some-notes-on-how-we-use-git">Some notes on how we use git</a></h1>
-<h2 id="on-keeping-the-commit-history-clean"><a class="header" href="#on-keeping-the-commit-history-clean">On keeping the commit history clean</a></h2>
-<p>In an ideal world, our git commit history would be a linear progression of
-commits each of which contains a single change building on what came
-before. Here, by way of an arbitrary example, is the top of <code>git log --graph b2dba0607</code>:</p>
-<img src="git/clean.png" alt="clean git graph" width="500px">
-<p>Note how the commit comment explains clearly what is changing and why. Also
-note the <em>absence</em> of merge commits, as well as the absence of commits called
-things like (to pick a few culprits):
-<a href="https://github.com/matrix-org/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/matrix-org/synapse/commit/474810d9d">“fix broken
-test”</a>,
-<a href="https://github.com/matrix-org/synapse/commit/c9d72e457">“oops”</a>,
-<a href="https://github.com/matrix-org/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/matrix-org/synapse/commit/707374d5d">“Who's
-the president?”</a>.</p>
-<p>There are a number of reasons why keeping a clean commit history is a good
-thing:</p>
-<ul>
-<li>
-<p>From time to time, after a change lands, it turns out to be necessary to
-revert it, or to backport it to a release branch. Those operations are
-<em>much</em> easier when the change is contained in a single commit.</p>
-</li>
-<li>
-<p>Similarly, it's much easier to answer questions like “is the fix for
-<code>/publicRooms</code> on the release branch?” if that change consists of a single
-commit.</p>
-</li>
-<li>
-<p>Likewise: “what has changed on this branch in the last week?” is much
-clearer without merges and “pep8” commits everywhere.</p>
-</li>
-<li>
-<p>Sometimes we need to figure out where a bug got introduced, or some
-behaviour changed. One way of doing that is with <code>git bisect</code>: pick an
-arbitrary commit between the known good point and the known bad point, and
-see how the code behaves. However, that strategy fails if the commit you
-chose is the middle of someone's epic branch in which they broke the world
-before putting it back together again.</p>
-</li>
-</ul>
-<p>One counterargument is that it is sometimes useful to see how a PR evolved as
-it went through review cycles. This is true, but that information is always
-available via the GitHub UI (or via the little-known <a href="https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/checking-out-pull-requests-locally">refs/pull
-namespace</a>).</p>
-<p>Of course, in reality, things are more complicated than that. We have release
-branches as well as <code>develop</code> and <code>master</code>, and we deliberately merge changes
-between them. Bugs often slip through and have to be fixed later. That's all
-fine: this not a cast-iron rule which must be obeyed, but an ideal to aim
-towards.</p>
-<h2 id="merges-squashes-rebases-wtf"><a class="header" href="#merges-squashes-rebases-wtf">Merges, squashes, rebases: wtf?</a></h2>
-<p>Ok, so that's what we'd like to achieve. How do we achieve it?</p>
-<p>The TL;DR is: when you come to merge a pull request, you <em>probably</em> want to
-“squash and merge”:</p>
-<p><img src="git/squash.png" alt="squash and merge" />.</p>
-<p>(This applies whether you are merging your own PR, or that of another
-contributor.)</p>
-<p>“Squash and merge”<sup id="a1"><a href="#f1">1</a></sup> takes all of the changes in the
-PR, and bundles them into a single commit. GitHub gives you the opportunity to
-edit the commit message before you confirm, and normally you should do so,
-because the default will be useless (again: <code>* woops typo</code> is not a useful
-thing to keep in the historical record).</p>
-<p>The main problem with this approach comes when you have a series of pull
-requests which build on top of one another: as soon as you squash-merge the
-first PR, you'll end up with a stack of conflicts to resolve in all of the
-others. In general, it's best to avoid this situation in the first place by
-trying not to have multiple related PRs in flight at the same time. Still,
-sometimes that's not possible and doing a regular merge is the lesser evil.</p>
-<p>Another occasion in which a regular merge makes more sense is a PR where you've
-deliberately created a series of commits each of which makes sense in its own
-right. For example: <a href="https://github.com/matrix-org/synapse/pull/6837">a PR which gradually propagates a refactoring operation
-through the codebase</a>, or <a href="https://github.com/matrix-org/synapse/pull/5987">a
-PR which is the culmination of several other
-PRs</a>. In this case the ability
-to figure out when a particular change/bug was introduced could be very useful.</p>
-<p>Ultimately: <strong>this is not a hard-and-fast-rule</strong>. If in doubt, ask yourself “do
-each of the commits I am about to merge make sense in their own right”, but
-remember that we're just doing our best to balance “keeping the commit history
-clean” with other factors.</p>
-<h2 id="git-branching-model"><a class="header" href="#git-branching-model">Git branching model</a></h2>
-<p>A <a href="https://nvie.com/posts/a-successful-git-branching-model/">lot</a>
-<a href="http://scottchacon.com/2011/08/31/github-flow.html">of</a>
-<a href="https://www.endoflineblog.com/gitflow-considered-harmful">words</a> have been
-written in the past about git branching models (no really, <a href="https://martinfowler.com/articles/branching-patterns.html">a
-lot</a>). I tend to
-think the whole thing is overblown. Fundamentally, it's not that
-complicated. Here's how we do it.</p>
-<p>Let's start with a picture:</p>
-<p><img src="git/branches.jpg" alt="branching model" /></p>
-<p>It looks complicated, but it's really not. There's one basic rule: <em>anyone</em> is
-free to merge from <em>any</em> more-stable branch to <em>any</em> less-stable branch at
-<em>any</em> time<sup id="a2"><a href="#f2">2</a></sup>. (The principle behind this is that if a
-change is good enough for the more-stable branch, then it's also good enough go
-put in a less-stable branch.)</p>
-<p>Meanwhile, merging (or squashing, as per the above) from a less-stable to a
-more-stable branch is a deliberate action in which you want to publish a change
-or a set of changes to (some subset of) the world: for example, this happens
-when a PR is landed, or as part of our release process.</p>
-<p>So, what counts as a more- or less-stable branch? A little reflection will show
-that our active branches are ordered thus, from more-stable to less-stable:</p>
-<ul>
-<li><code>master</code> (tracks our last release).</li>
-<li><code>release-vX.Y</code> (the branch where we prepare the next release)<sup
-   id="a3"><a href="#f3">3</a></sup>.</li>
-<li>PR branches which are targeting the release.</li>
-<li><code>develop</code> (our &quot;mainline&quot; branch containing our bleeding-edge).</li>
-<li>regular PR branches.</li>
-</ul>
-<p>The corollary is: if you have a bugfix that needs to land in both
-<code>release-vX.Y</code> <em>and</em> <code>develop</code>, then you should base your PR on
-<code>release-vX.Y</code>, get it merged there, and then merge from <code>release-vX.Y</code> to
-<code>develop</code>. (If a fix lands in <code>develop</code> and we later need it in a
-release-branch, we can of course cherry-pick it, but landing it in the release
-branch first helps reduce the chance of annoying conflicts.)</p>
-<hr />
-<p><b id="f1">[1]</b>: “Squash and merge” is GitHub's term for this
-operation. Given that there is no merge involved, I'm not convinced it's the
-most intuitive name. <a href="#a1">^</a></p>
-<p><b id="f2">[2]</b>: Well, anyone with commit access.<a href="#a2">^</a></p>
-<p><b id="f3">[3]</b>: Very, very occasionally (I think this has happened once in
-the history of Synapse), we've had two releases in flight at once. Obviously,
-<code>release-v1.2</code> is more-stable than <code>release-v1.3</code>. <a href="#a3">^</a></p>
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-                        <h1 id="how-to-test-saml-as-a-developer-without-a-server"><a class="header" href="#how-to-test-saml-as-a-developer-without-a-server">How to test SAML as a developer without a server</a></h1>
-<p>https://capriza.github.io/samling/samling.html (https://github.com/capriza/samling) is a great
-resource for being able to tinker with the SAML options within Synapse without needing to
-deploy and configure a complicated software stack.</p>
-<p>To make Synapse (and therefore Riot) use it:</p>
-<ol>
-<li>Use the samling.html URL above or deploy your own and visit the IdP Metadata tab.</li>
-<li>Copy the XML to your clipboard.</li>
-<li>On your Synapse server, create a new file <code>samling.xml</code> next to your <code>homeserver.yaml</code> with
-the XML from step 2 as the contents.</li>
-<li>Edit your <code>homeserver.yaml</code> to include:
-<pre><code class="language-yaml">saml2_config:
-  sp_config:
-    allow_unknown_attributes: true  # Works around a bug with AVA Hashes: https://github.com/IdentityPython/pysaml2/issues/388
-    metadata:
-      local: [&quot;samling.xml&quot;]   
-</code></pre>
-</li>
-<li>Ensure that your <code>homeserver.yaml</code> has a setting for <code>public_baseurl</code>:
-<pre><code class="language-yaml">public_baseurl: http://localhost:8080/
-</code></pre>
-</li>
-<li>Run <code>apt-get install xmlsec1</code> and <code>pip install --upgrade --force 'pysaml2&gt;=4.5.0'</code> to ensure
-the dependencies are installed and ready to go.</li>
-<li>Restart Synapse.</li>
-</ol>
-<p>Then in Riot:</p>
-<ol>
-<li>Visit the login page with a Riot pointing at your homeserver.</li>
-<li>Click the Single Sign-On button.</li>
-<li>On the samling page, enter a Name Identifier and add a SAML Attribute for <code>uid=your_localpart</code>.
-The response must also be signed.</li>
-<li>Click &quot;Next&quot;.</li>
-<li>Click &quot;Post Response&quot; (change nothing).</li>
-<li>You should be logged in.</li>
-</ol>
-<p>If you try and repeat this process, you may be automatically logged in using the information you
-gave previously. To fix this, open your developer console (<code>F12</code> or <code>Ctrl+Shift+I</code>) while on the
-samling page and clear the site data. In Chrome, this will be a button on the Application tab.</p>
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-                        <h1 id="modules"><a class="header" href="#modules">Modules</a></h1>
-<p>Synapse supports extending its functionality by configuring external modules.</p>
-<h2 id="using-modules"><a class="header" href="#using-modules">Using modules</a></h2>
-<p>To use a module on Synapse, add it to the <code>modules</code> section of the configuration file:</p>
-<pre><code class="language-yaml">modules:
-  - module: my_super_module.MySuperClass
-    config:
-      do_thing: true
-  - module: my_other_super_module.SomeClass
-    config: {}
-</code></pre>
-<p>Each module is defined by a path to a Python class as well as a configuration. This
-information for a given module should be available in the module's own documentation.</p>
-<p><strong>Note</strong>: When using third-party modules, you effectively allow someone else to run
-custom code on your Synapse homeserver. Server admins are encouraged to verify the
-provenance of the modules they use on their homeserver and make sure the modules aren't
-running malicious code on their instance.</p>
-<p>Also note that we are currently in the process of migrating module interfaces to this
-system. While some interfaces might be compatible with it, others still require
-configuring modules in another part of Synapse's configuration file. Currently, only the
-spam checker interface is compatible with this new system.</p>
-<h2 id="writing-a-module"><a class="header" href="#writing-a-module">Writing a module</a></h2>
-<p>A module is a Python class that uses Synapse's module API to interact with the
-homeserver. It can register callbacks that Synapse will call on specific operations, as
-well as web resources to attach to Synapse's web server.</p>
-<p>When instantiated, a module is given its parsed configuration as well as an instance of
-the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dictionary, and is
-either the output of the module's <code>parse_config</code> static method (see below), or the
-configuration associated with the module in Synapse's configuration file.</p>
-<p>See the documentation for the <code>ModuleApi</code> class
-<a href="https://github.com/matrix-org/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
-<h3 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h3>
-<p>A module can implement the following static method:</p>
-<pre><code class="language-python">@staticmethod
-def parse_config(config: dict) -&gt; dict
-</code></pre>
-<p>This method is given a dictionary resulting from parsing the YAML configuration for the
-module. It may modify it (for example by parsing durations expressed as strings (e.g.
-&quot;5d&quot;) into milliseconds, etc.), and return the modified dictionary. It may also verify
-that the configuration is correct, and raise an instance of
-<code>synapse.module_api.errors.ConfigError</code> if not.</p>
-<h3 id="registering-a-web-resource"><a class="header" href="#registering-a-web-resource">Registering a web resource</a></h3>
-<p>Modules can register web resources onto Synapse's web server using the following module
-API method:</p>
-<pre><code class="language-python">def ModuleApi.register_web_resource(path: str, resource: IResource) -&gt; None
-</code></pre>
-<p>The path is the full absolute path to register the resource at. For example, if you
-register a resource for the path <code>/_synapse/client/my_super_module/say_hello</code>, Synapse
-will serve it at <code>http(s)://[HS_URL]/_synapse/client/my_super_module/say_hello</code>. Note
-that Synapse does not allow registering resources for several sub-paths in the <code>/_matrix</code>
-namespace (such as anything under <code>/_matrix/client</code> for example). It is strongly
-recommended that modules register their web resources under the <code>/_synapse/client</code>
-namespace.</p>
-<p>The provided resource is a Python class that implements Twisted's <a href="https://twistedmatrix.com/documents/current/api/twisted.web.resource.IResource.html">IResource</a>
-interface (such as <a href="https://twistedmatrix.com/documents/current/api/twisted.web.resource.Resource.html">Resource</a>).</p>
-<p>Only one resource can be registered for a given path. If several modules attempt to
-register a resource for the same path, the module that appears first in Synapse's
-configuration file takes priority.</p>
-<p>Modules <strong>must</strong> register their web resources in their <code>__init__</code> method.</p>
-<h3 id="registering-a-callback"><a class="header" href="#registering-a-callback">Registering a callback</a></h3>
-<p>Modules can use Synapse's module API to register callbacks. Callbacks are functions that
-Synapse will call when performing specific actions. Callbacks must be asynchronous, and
-are split in categories. A single module may implement callbacks from multiple categories,
-and is under no obligation to implement all callbacks from the categories it registers
-callbacks for.</p>
-<p>Modules can register callbacks using one of the module API's <code>register_[...]_callbacks</code>
-methods. The callback functions are passed to these methods as keyword arguments, with
-the callback name as the argument name and the function as its value. This is demonstrated
-in the example below. A <code>register_[...]_callbacks</code> method exists for each module type
-documented in this section.</p>
-<h4 id="spam-checker-callbacks"><a class="header" href="#spam-checker-callbacks">Spam checker callbacks</a></h4>
-<p>Spam checker callbacks allow module developers to implement spam mitigation actions for
-Synapse instances. Spam checker callbacks can be registered using the module API's
-<code>register_spam_checker_callbacks</code> method.</p>
-<p>The available spam checker callbacks are:</p>
-<pre><code class="language-python">async def check_event_for_spam(event: &quot;synapse.events.EventBase&quot;) -&gt; Union[bool, str]
-</code></pre>
-<p>Called when receiving an event from a client or via federation. The module can return
-either a <code>bool</code> to indicate whether the event must be rejected because of spam, or a <code>str</code>
-to indicate the event must be rejected because of spam and to give a rejection reason to
-forward to clients.</p>
-<pre><code class="language-python">async def user_may_invite(inviter: str, invitee: str, room_id: str) -&gt; bool
-</code></pre>
-<p>Called when processing an invitation. The module must return a <code>bool</code> indicating whether
-the inviter can invite the invitee to the given room. Both inviter and invitee are
-represented by their Matrix user ID (e.g. <code>@alice:example.com</code>).</p>
-<pre><code class="language-python">async def user_may_create_room(user: str) -&gt; bool
-</code></pre>
-<p>Called when processing a room creation request. The module must return a <code>bool</code> indicating
-whether the given user (represented by their Matrix user ID) is allowed to create a room.</p>
-<pre><code class="language-python">async def user_may_create_room_alias(user: str, room_alias: &quot;synapse.types.RoomAlias&quot;) -&gt; bool
-</code></pre>
-<p>Called when trying to associate an alias with an existing room. The module must return a
-<code>bool</code> indicating whether the given user (represented by their Matrix user ID) is allowed
-to set the given alias.</p>
-<pre><code class="language-python">async def user_may_publish_room(user: str, room_id: str) -&gt; bool
-</code></pre>
-<p>Called when trying to publish a room to the homeserver's public rooms directory. The
-module must return a <code>bool</code> indicating whether the given user (represented by their
-Matrix user ID) is allowed to publish the given room.</p>
-<pre><code class="language-python">async def check_username_for_spam(user_profile: Dict[str, str]) -&gt; bool
-</code></pre>
-<p>Called when computing search results in the user directory. The module must return a
-<code>bool</code> indicating whether the given user profile can appear in search results. The profile
-is represented as a dictionary with the following keys:</p>
-<ul>
-<li><code>user_id</code>: The Matrix ID for this user.</li>
-<li><code>display_name</code>: The user's display name.</li>
-<li><code>avatar_url</code>: The <code>mxc://</code> URL to the user's avatar.</li>
-</ul>
-<p>The module is given a copy of the original dictionary, so modifying it from within the
-module cannot modify a user's profile when included in user directory search results.</p>
-<pre><code class="language-python">async def check_registration_for_spam(
-    email_threepid: Optional[dict],
-    username: Optional[str],
-    request_info: Collection[Tuple[str, str]],
-    auth_provider_id: Optional[str] = None,
-) -&gt; &quot;synapse.spam_checker_api.RegistrationBehaviour&quot;
-</code></pre>
-<p>Called when registering a new user. The module must return a <code>RegistrationBehaviour</code>
-indicating whether the registration can go through or must be denied, or whether the user
-may be allowed to register but will be shadow banned.</p>
-<p>The arguments passed to this callback are:</p>
-<ul>
-<li><code>email_threepid</code>: The email address used for registering, if any.</li>
-<li><code>username</code>: The username the user would like to register. Can be <code>None</code>, meaning that
-Synapse will generate one later.</li>
-<li><code>request_info</code>: A collection of tuples, which first item is a user agent, and which
-second item is an IP address. These user agents and IP addresses are the ones that were
-used during the registration process.</li>
-<li><code>auth_provider_id</code>: The identifier of the SSO authentication provider, if any.</li>
-</ul>
-<pre><code class="language-python">async def check_media_file_for_spam(
-    file_wrapper: &quot;synapse.rest.media.v1.media_storage.ReadableFileWrapper&quot;,
-    file_info: &quot;synapse.rest.media.v1._base.FileInfo&quot;,
-) -&gt; bool
-</code></pre>
-<p>Called when storing a local or remote file. The module must return a boolean indicating
-whether the given file can be stored in the homeserver's media store.</p>
-<h4 id="account-validity-callbacks"><a class="header" href="#account-validity-callbacks">Account validity callbacks</a></h4>
-<p>Account validity callbacks allow module developers to add extra steps to verify the
-validity on an account, i.e. see if a user can be granted access to their account on the
-Synapse instance. Account validity callbacks can be registered using the module API's
-<code>register_account_validity_callbacks</code> method.</p>
-<p>The available account validity callbacks are:</p>
-<pre><code class="language-python">async def is_user_expired(user: str) -&gt; Optional[bool]
-</code></pre>
-<p>Called when processing any authenticated request (except for logout requests). The module
-can return a <code>bool</code> to indicate whether the user has expired and should be locked out of
-their account, or <code>None</code> if the module wasn't able to figure it out. The user is
-represented by their Matrix user ID (e.g. <code>@alice:example.com</code>).</p>
-<p>If the module returns <code>True</code>, the current request will be denied with the error code
-<code>ORG_MATRIX_EXPIRED_ACCOUNT</code> and the HTTP status code 403. Note that this doesn't
-invalidate the user's access token.</p>
-<pre><code class="language-python">async def on_user_registration(user: str) -&gt; None
-</code></pre>
-<p>Called after successfully registering a user, in case the module needs to perform extra
-operations to keep track of them. (e.g. add them to a database table). The user is
-represented by their Matrix user ID.</p>
-<h4 id="third-party-rules-callbacks"><a class="header" href="#third-party-rules-callbacks">Third party rules callbacks</a></h4>
-<p>Third party rules callbacks allow module developers to add extra checks to verify the
-validity of incoming events. Third party event rules callbacks can be registered using
-the module API's <code>register_third_party_rules_callbacks</code> method.</p>
-<p>The available third party rules callbacks are:</p>
-<pre><code class="language-python">async def check_event_allowed(
-    event: &quot;synapse.events.EventBase&quot;,
-    state_events: &quot;synapse.types.StateMap&quot;,
-) -&gt; Tuple[bool, Optional[dict]]
-</code></pre>
-<p><strong><span style="color:red">
-This callback is very experimental and can and will break without notice. Module developers
-are encouraged to implement <code>check_event_for_spam</code> from the spam checker category instead.
-</span></strong></p>
-<p>Called when processing any incoming event, with the event and a <code>StateMap</code>
-representing the current state of the room the event is being sent into. A <code>StateMap</code> is
-a dictionary that maps tuples containing an event type and a state key to the
-corresponding state event. For example retrieving the room's <code>m.room.create</code> event from
-the <code>state_events</code> argument would look like this: <code>state_events.get((&quot;m.room.create&quot;, &quot;&quot;))</code>.
-The module must return a boolean indicating whether the event can be allowed.</p>
-<p>Note that this callback function processes incoming events coming via federation
-traffic (on top of client traffic). This means denying an event might cause the local
-copy of the room's history to diverge from that of remote servers. This may cause
-federation issues in the room. It is strongly recommended to only deny events using this
-callback function if the sender is a local user, or in a private federation in which all
-servers are using the same module, with the same configuration.</p>
-<p>If the boolean returned by the module is <code>True</code>, it may also tell Synapse to replace the
-event with new data by returning the new event's data as a dictionary. In order to do
-that, it is recommended the module calls <code>event.get_dict()</code> to get the current event as a
-dictionary, and modify the returned dictionary accordingly.</p>
-<p>Note that replacing the event only works for events sent by local users, not for events
-received over federation.</p>
-<pre><code class="language-python">async def on_create_room(
-    requester: &quot;synapse.types.Requester&quot;,
-    request_content: dict,
-    is_requester_admin: bool,
-) -&gt; None
-</code></pre>
-<p>Called when processing a room creation request, with the <code>Requester</code> object for the user
-performing the request, a dictionary representing the room creation request's JSON body
-(see <a href="https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-createroom">the spec</a>
-for a list of possible parameters), and a boolean indicating whether the user performing
-the request is a server admin.</p>
-<p>Modules can modify the <code>request_content</code> (by e.g. adding events to its <code>initial_state</code>),
-or deny the room's creation by raising a <code>module_api.errors.SynapseError</code>.</p>
-<h4 id="presence-router-callbacks"><a class="header" href="#presence-router-callbacks">Presence router callbacks</a></h4>
-<p>Presence router callbacks allow module developers to specify additional users (local or remote)
-to receive certain presence updates from local users. Presence router callbacks can be 
-registered using the module API's <code>register_presence_router_callbacks</code> method.</p>
-<p>The available presence router callbacks are:</p>
-<pre><code class="language-python">async def get_users_for_states(
-    self,
-    state_updates: Iterable[&quot;synapse.api.UserPresenceState&quot;],
-) -&gt; Dict[str, Set[&quot;synapse.api.UserPresenceState&quot;]]:
-</code></pre>
-<p><strong>Requires</strong> <code>get_interested_users</code> to also be registered</p>
-<p>Called when processing updates to the presence state of one or more users. This callback can
-be used to instruct the server to forward that presence state to specific users. The module
-must return a dictionary that maps from Matrix user IDs (which can be local or remote) to the
-<code>UserPresenceState</code> changes that they should be forwarded.</p>
-<p>Synapse will then attempt to send the specified presence updates to each user when possible.</p>
-<pre><code class="language-python">async def get_interested_users(
-        self, 
-        user_id: str
-) -&gt; Union[Set[str], &quot;synapse.module_api.PRESENCE_ALL_USERS&quot;]
-</code></pre>
-<p><strong>Requires</strong> <code>get_users_for_states</code> to also be registered</p>
-<p>Called when determining which users someone should be able to see the presence state of. This
-callback should return complementary results to <code>get_users_for_state</code> or the presence information 
-may not be properly forwarded.</p>
-<p>The callback is given the Matrix user ID for a local user that is requesting presence data and
-should return the Matrix user IDs of the users whose presence state they are allowed to
-query. The returned users can be local or remote. </p>
-<p>Alternatively the callback can return <code>synapse.module_api.PRESENCE_ALL_USERS</code>
-to indicate that the user should receive updates from all known users.</p>
-<p>For example, if the user <code>@alice:example.org</code> is passed to this method, and the Set 
-<code>{&quot;@bob:example.com&quot;, &quot;@charlie:somewhere.org&quot;}</code> is returned, this signifies that Alice 
-should receive presence updates sent by Bob and Charlie, regardless of whether these users 
-share a room.</p>
-<h3 id="porting-an-existing-module-that-uses-the-old-interface"><a class="header" href="#porting-an-existing-module-that-uses-the-old-interface">Porting an existing module that uses the old interface</a></h3>
-<p>In order to port a module that uses Synapse's old module interface, its author needs to:</p>
-<ul>
-<li>ensure the module's callbacks are all asynchronous.</li>
-<li>register their callbacks using one or more of the <code>register_[...]_callbacks</code> methods
-from the <code>ModuleApi</code> class in the module's <code>__init__</code> method (see <a href="#registering-a-callback">this section</a>
-for more info).</li>
-</ul>
-<p>Additionally, if the module is packaged with an additional web resource, the module
-should register this resource in its <code>__init__</code> method using the <code>register_web_resource</code>
-method from the <code>ModuleApi</code> class (see <a href="#registering-a-web-resource">this section</a> for
-more info).</p>
-<p>The module's author should also update any example in the module's configuration to only
-use the new <code>modules</code> section in Synapse's configuration file (see <a href="#using-modules">this section</a>
-for more info).</p>
-<h3 id="example"><a class="header" href="#example">Example</a></h3>
-<p>The example below is a module that implements the spam checker callback
-<code>user_may_create_room</code> to deny room creation to user <code>@evilguy:example.com</code>, and registers
-a web resource to the path <code>/_synapse/client/demo/hello</code> that returns a JSON object.</p>
-<pre><code class="language-python">import json
-
-from twisted.web.resource import Resource
-from twisted.web.server import Request
-
-from synapse.module_api import ModuleApi
-
-
-class DemoResource(Resource):
-    def __init__(self, config):
-        super(DemoResource, self).__init__()
-        self.config = config
-
-    def render_GET(self, request: Request):
-        name = request.args.get(b&quot;name&quot;)[0]
-        request.setHeader(b&quot;Content-Type&quot;, b&quot;application/json&quot;)
-        return json.dumps({&quot;hello&quot;: name})
-
-
-class DemoModule:
-    def __init__(self, config: dict, api: ModuleApi):
-        self.config = config
-        self.api = api
-
-        self.api.register_web_resource(
-            path=&quot;/_synapse/client/demo/hello&quot;,
-            resource=DemoResource(self.config),
-        )
-
-        self.api.register_spam_checker_callbacks(
-            user_may_create_room=self.user_may_create_room,
-        )
-
-    @staticmethod
-    def parse_config(config):
-        return config
-
-    async def user_may_create_room(self, user: str) -&gt; bool:
-        if user == &quot;@evilguy:example.com&quot;:
-            return False
-
-        return True
-</code></pre>
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-                        <h2 style="color:red">
-This page of the Synapse documentation is now deprecated. For up to date
-documentation on setting up or writing a presence router module, please see
-<a href="modules.html">this page</a>.
-</h2>
-<h1 id="presence-router-module"><a class="header" href="#presence-router-module">Presence Router Module</a></h1>
-<p>Synapse supports configuring a module that can specify additional users
-(local or remote) to should receive certain presence updates from local
-users.</p>
-<p>Note that routing presence via Application Service transactions is not
-currently supported.</p>
-<p>The presence routing module is implemented as a Python class, which will
-be imported by the running Synapse.</p>
-<h2 id="python-presence-router-class"><a class="header" href="#python-presence-router-class">Python Presence Router Class</a></h2>
-<p>The Python class is instantiated with two objects:</p>
-<ul>
-<li>A configuration object of some type (see below).</li>
-<li>An instance of <code>synapse.module_api.ModuleApi</code>.</li>
-</ul>
-<p>It then implements methods related to presence routing.</p>
-<p>Note that one method of <code>ModuleApi</code> that may be useful is:</p>
-<pre><code class="language-python">async def ModuleApi.send_local_online_presence_to(users: Iterable[str]) -&gt; None
-</code></pre>
-<p>which can be given a list of local or remote MXIDs to broadcast known, online user
-presence to (for those users that the receiving user is considered interested in). 
-It does not include state for users who are currently offline, and it can only be
-called on workers that support sending federation. Additionally, this method must
-only be called from the process that has been configured to write to the
-the <a href="workers.html#stream-writers">presence stream</a>.
-By default, this is the main process, but another worker can be configured to do
-so.</p>
-<h3 id="module-structure"><a class="header" href="#module-structure">Module structure</a></h3>
-<p>Below is a list of possible methods that can be implemented, and whether they are
-required.</p>
-<h4 id="parse_config"><a class="header" href="#parse_config"><code>parse_config</code></a></h4>
-<pre><code class="language-python">def parse_config(config_dict: dict) -&gt; Any
-</code></pre>
-<p><strong>Required.</strong> A static method that is passed a dictionary of config options, and
-should return a validated config object. This method is described further in
-<a href="#configuration">Configuration</a>.</p>
-<h4 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h4>
-<pre><code class="language-python">async def get_users_for_states(
-    self,
-    state_updates: Iterable[UserPresenceState],
-) -&gt; Dict[str, Set[UserPresenceState]]:
-</code></pre>
-<p><strong>Required.</strong> An asynchronous method that is passed an iterable of user presence
-state. This method can determine whether a given presence update should be sent to certain
-users. It does this by returning a dictionary with keys representing local or remote
-Matrix User IDs, and values being a python set
-of <code>synapse.handlers.presence.UserPresenceState</code> instances.</p>
-<p>Synapse will then attempt to send the specified presence updates to each user when
-possible.</p>
-<h4 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h4>
-<pre><code class="language-python">async def get_interested_users(self, user_id: str) -&gt; Union[Set[str], str]
-</code></pre>
-<p><strong>Required.</strong> An asynchronous method that is passed a single Matrix User ID. This
-method is expected to return the users that the passed in user may be interested in the
-presence of. Returned users may be local or remote. The presence routed as a result of
-what this method returns is sent in addition to the updates already sent between users
-that share a room together. Presence updates are deduplicated.</p>
-<p>This method should return a python set of Matrix User IDs, or the object
-<code>synapse.events.presence_router.PresenceRouter.ALL_USERS</code> to indicate that the passed
-user should receive presence information for <em>all</em> known users.</p>
-<p>For clarity, if the user <code>@alice:example.org</code> is passed to this method, and the Set
-<code>{&quot;@bob:example.com&quot;, &quot;@charlie:somewhere.org&quot;}</code> is returned, this signifies that Alice
-should receive presence updates sent by Bob and Charlie, regardless of whether these
-users share a room.</p>
-<h3 id="example"><a class="header" href="#example">Example</a></h3>
-<p>Below is an example implementation of a presence router class.</p>
-<pre><code class="language-python">from typing import Dict, Iterable, Set, Union
-from synapse.events.presence_router import PresenceRouter
-from synapse.handlers.presence import UserPresenceState
-from synapse.module_api import ModuleApi
-
-class PresenceRouterConfig:
-    def __init__(self):
-        # Config options with their defaults
-        # A list of users to always send all user presence updates to
-        self.always_send_to_users = []  # type: List[str]
-        
-        # A list of users to ignore presence updates for. Does not affect
-        # shared-room presence relationships
-        self.blacklisted_users = []  # type: List[str]
-
-class ExamplePresenceRouter:
-    &quot;&quot;&quot;An example implementation of synapse.presence_router.PresenceRouter.
-    Supports routing all presence to a configured set of users, or a subset
-    of presence from certain users to members of certain rooms.
-
-    Args:
-        config: A configuration object.
-        module_api: An instance of Synapse's ModuleApi.
-    &quot;&quot;&quot;
-    def __init__(self, config: PresenceRouterConfig, module_api: ModuleApi):
-        self._config = config
-        self._module_api = module_api
-
-    @staticmethod
-    def parse_config(config_dict: dict) -&gt; PresenceRouterConfig:
-        &quot;&quot;&quot;Parse a configuration dictionary from the homeserver config, do
-        some validation and return a typed PresenceRouterConfig.
-
-        Args:
-            config_dict: The configuration dictionary.
-
-        Returns:
-            A validated config object.
-        &quot;&quot;&quot;
-        # Initialise a typed config object
-        config = PresenceRouterConfig()
-        always_send_to_users = config_dict.get(&quot;always_send_to_users&quot;)
-        blacklisted_users = config_dict.get(&quot;blacklisted_users&quot;)
-
-        # Do some validation of config options... otherwise raise a
-        # synapse.config.ConfigError.
-        config.always_send_to_users = always_send_to_users
-        config.blacklisted_users = blacklisted_users
-
-        return config
-
-    async def get_users_for_states(
-        self,
-        state_updates: Iterable[UserPresenceState],
-    ) -&gt; Dict[str, Set[UserPresenceState]]:
-        &quot;&quot;&quot;Given an iterable of user presence updates, determine where each one
-        needs to go. Returned results will not affect presence updates that are
-        sent between users who share a room.
-
-        Args:
-            state_updates: An iterable of user presence state updates.
-
-        Returns:
-          A dictionary of user_id -&gt; set of UserPresenceState that the user should 
-          receive.
-        &quot;&quot;&quot;
-        destination_users = {}  # type: Dict[str, Set[UserPresenceState]
-
-        # Ignore any updates for blacklisted users
-        desired_updates = set()
-        for update in state_updates:
-            if update.state_key not in self._config.blacklisted_users:
-                desired_updates.add(update)
-
-        # Send all presence updates to specific users
-        for user_id in self._config.always_send_to_users:
-            destination_users[user_id] = desired_updates
-
-        return destination_users
-
-    async def get_interested_users(
-        self,
-        user_id: str,
-    ) -&gt; Union[Set[str], PresenceRouter.ALL_USERS]:
-        &quot;&quot;&quot;
-        Retrieve a list of users that `user_id` is interested in receiving the
-        presence of. This will be in addition to those they share a room with.
-        Optionally, the object PresenceRouter.ALL_USERS can be returned to indicate
-        that this user should receive all incoming local and remote presence updates.
-
-        Note that this method will only be called for local users.
-
-        Args:
-          user_id: A user requesting presence updates.
-
-        Returns:
-          A set of user IDs to return additional presence updates for, or
-          PresenceRouter.ALL_USERS to return presence updates for all other users.
-        &quot;&quot;&quot;
-        if user_id in self._config.always_send_to_users:
-            return PresenceRouter.ALL_USERS
-
-        return set()
-</code></pre>
-<h4 id="a-note-on-get_users_for_states-and-get_interested_users"><a class="header" href="#a-note-on-get_users_for_states-and-get_interested_users">A note on <code>get_users_for_states</code> and <code>get_interested_users</code></a></h4>
-<p>Both of these methods are effectively two different sides of the same coin. The logic
-regarding which users should receive updates for other users should be the same 
-between them.</p>
-<p><code>get_users_for_states</code> is called when presence updates come in from either federation 
-or local users, and is used to either direct local presence to remote users, or to
-wake up the sync streams of local users to collect remote presence.</p>
-<p>In contrast, <code>get_interested_users</code> is used to determine the users that presence should
-be fetched for when a local user is syncing. This presence is then retrieved, before
-being fed through <code>get_users_for_states</code> once again, with only the syncing user's
-routing information pulled from the resulting dictionary.</p>
-<p>Their routing logic should thus line up, else you may run into unintended behaviour.</p>
-<h2 id="configuration"><a class="header" href="#configuration">Configuration</a></h2>
-<p>Once you've crafted your module and installed it into the same Python environment as
-Synapse, amend your homeserver config file with the following.</p>
-<pre><code class="language-yaml">presence:
-  enabled: true
-
-  presence_router:
-    module: my_module.ExamplePresenceRouter
-    config:
-      # Any configuration options for your module. The below is an example.
-      # of setting options for ExamplePresenceRouter.
-      always_send_to_users: [&quot;@presence_gobbler:example.org&quot;]
-      blacklisted_users:
-        - &quot;@alice:example.com&quot;
-        - &quot;@bob:example.com&quot;
-      ...
-</code></pre>
-<p>The contents of <code>config</code> will be passed as a Python dictionary to the static
-<code>parse_config</code> method of your class. The object returned by this method will
-then be passed to the <code>__init__</code> method of your module as <code>config</code>.</p>
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-                        <h2 style="color:red">
-This page of the Synapse documentation is now deprecated. For up to date
-documentation on setting up or writing a spam checker module, please see
-<a href="modules.html">this page</a>.
-</h2>
-<h1 id="handling-spam-in-synapse"><a class="header" href="#handling-spam-in-synapse">Handling spam in Synapse</a></h1>
-<p>Synapse has support to customize spam checking behavior. It can plug into a
-variety of events and affect how they are presented to users on your homeserver.</p>
-<p>The spam checking behavior is implemented as a Python class, which must be
-able to be imported by the running Synapse.</p>
-<h2 id="python-spam-checker-class"><a class="header" href="#python-spam-checker-class">Python spam checker class</a></h2>
-<p>The Python class is instantiated with two objects:</p>
-<ul>
-<li>Any configuration (see below).</li>
-<li>An instance of <code>synapse.module_api.ModuleApi</code>.</li>
-</ul>
-<p>It then implements methods which return a boolean to alter behavior in Synapse.
-All the methods must be defined.</p>
-<p>There's a generic method for checking every event (<code>check_event_for_spam</code>), as
-well as some specific methods:</p>
-<ul>
-<li><code>user_may_invite</code></li>
-<li><code>user_may_create_room</code></li>
-<li><code>user_may_create_room_alias</code></li>
-<li><code>user_may_publish_room</code></li>
-<li><code>check_username_for_spam</code></li>
-<li><code>check_registration_for_spam</code></li>
-<li><code>check_media_file_for_spam</code></li>
-</ul>
-<p>The details of each of these methods (as well as their inputs and outputs)
-are documented in the <code>synapse.events.spamcheck.SpamChecker</code> class.</p>
-<p>The <code>ModuleApi</code> class provides a way for the custom spam checker class to
-call back into the homeserver internals.</p>
-<p>Additionally, a <code>parse_config</code> method is mandatory and receives the plugin config
-dictionary. After parsing, It must return an object which will be
-passed to <code>__init__</code> later.</p>
-<h3 id="example"><a class="header" href="#example">Example</a></h3>
-<pre><code class="language-python">from synapse.spam_checker_api import RegistrationBehaviour
-
-class ExampleSpamChecker:
-    def __init__(self, config, api):
-        self.config = config
-        self.api = api
-
-    @staticmethod
-    def parse_config(config):
-        return config
-        
-    async def check_event_for_spam(self, foo):
-        return False  # allow all events
-
-    async def user_may_invite(self, inviter_userid, invitee_userid, room_id):
-        return True  # allow all invites
-
-    async def user_may_create_room(self, userid):
-        return True  # allow all room creations
-
-    async def user_may_create_room_alias(self, userid, room_alias):
-        return True  # allow all room aliases
-
-    async def user_may_publish_room(self, userid, room_id):
-        return True  # allow publishing of all rooms
-
-    async def check_username_for_spam(self, user_profile):
-        return False  # allow all usernames
-
-    async def check_registration_for_spam(
-        self,
-        email_threepid,
-        username,
-        request_info,
-        auth_provider_id,
-    ):
-        return RegistrationBehaviour.ALLOW  # allow all registrations
-
-    async def check_media_file_for_spam(self, file_wrapper, file_info):
-        return False  # allow all media
-</code></pre>
-<h2 id="configuration"><a class="header" href="#configuration">Configuration</a></h2>
-<p>Modify the <code>spam_checker</code> section of your <code>homeserver.yaml</code> in the following
-manner:</p>
-<p>Create a list entry with the keys <code>module</code> and <code>config</code>.</p>
-<ul>
-<li>
-<p><code>module</code> should point to the fully qualified Python class that implements your
-custom logic, e.g. <code>my_module.ExampleSpamChecker</code>.</p>
-</li>
-<li>
-<p><code>config</code> is a dictionary that gets passed to the spam checker class.</p>
-</li>
-</ul>
-<h3 id="example-1"><a class="header" href="#example-1">Example</a></h3>
-<p>This section might look like:</p>
-<pre><code class="language-yaml">spam_checker:
-  - module: my_module.ExampleSpamChecker
-    config:
-      # Enable or disable a specific option in ExampleSpamChecker.
-      my_custom_option: true
-</code></pre>
-<p>More spam checkers can be added in tandem by appending more items to the list. An
-action is blocked when at least one of the configured spam checkers flags it.</p>
-<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
-<p>The <a href="https://github.com/matrix-org/mjolnir">Mjolnir</a> project is a full fledged
-example using the Synapse spam checking API, including a bot for dynamic
-configuration.</p>
-
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-                        <h1 id="url-previews"><a class="header" href="#url-previews">URL Previews</a></h1>
-<p>Design notes on a URL previewing service for Matrix:</p>
-<p>Options are:</p>
-<ol>
-<li>Have an AS which listens for URLs, downloads them, and inserts an event that describes their metadata.</li>
-</ol>
-<ul>
-<li>Pros:
-<ul>
-<li>Decouples the implementation entirely from Synapse.</li>
-<li>Uses existing Matrix events &amp; content repo to store the metadata.</li>
-</ul>
-</li>
-<li>Cons:
-<ul>
-<li>Which AS should provide this service for a room, and why should you trust it?</li>
-<li>Doesn't work well with E2E; you'd have to cut the AS into every room</li>
-<li>the AS would end up subscribing to every room anyway.</li>
-</ul>
-</li>
-</ul>
-<ol start="2">
-<li>Have a generic preview API (nothing to do with Matrix) that provides a previewing service:</li>
-</ol>
-<ul>
-<li>Pros:
-<ul>
-<li>Simple and flexible; can be used by any clients at any point</li>
-</ul>
-</li>
-<li>Cons:
-<ul>
-<li>If each HS provides one of these independently, all the HSes in a room may needlessly DoS the target URI</li>
-<li>We need somewhere to store the URL metadata rather than just using Matrix itself</li>
-<li>We can't piggyback on matrix to distribute the metadata between HSes.</li>
-</ul>
-</li>
-</ul>
-<ol start="3">
-<li>Make the synapse of the sending user responsible for spidering the URL and inserting an event asynchronously which describes the metadata.</li>
-</ol>
-<ul>
-<li>Pros:
-<ul>
-<li>Works transparently for all clients</li>
-<li>Piggy-backs nicely on using Matrix for distributing the metadata.</li>
-<li>No confusion as to which AS</li>
-</ul>
-</li>
-<li>Cons:
-<ul>
-<li>Doesn't work with E2E</li>
-<li>We might want to decouple the implementation of the spider from the HS, given spider behaviour can be quite complicated and evolve much more rapidly than the HS.  It's more like a bot than a core part of the server.</li>
-</ul>
-</li>
-</ul>
-<ol start="4">
-<li>Make the sending client use the preview API and insert the event itself when successful.</li>
-</ol>
-<ul>
-<li>Pros:
-<ul>
-<li>Works well with E2E</li>
-<li>No custom server functionality</li>
-<li>Lets the client customise the preview that they send (like on FB)</li>
-</ul>
-</li>
-<li>Cons:
-<ul>
-<li>Entirely specific to the sending client, whereas it'd be nice if /any/ URL was correctly previewed if clients support it.</li>
-</ul>
-</li>
-</ul>
-<ol start="5">
-<li>Have the option of specifying a shared (centralised) previewing service used by a room, to avoid all the different HSes in the room DoSing the target.</li>
-</ol>
-<p>Best solution is probably a combination of both 2 and 4.</p>
-<ul>
-<li>Sending clients do their best to create and send a preview at the point of sending the message, perhaps delaying the message until the preview is computed?  (This also lets the user validate the preview before sending)</li>
-<li>Receiving clients have the option of going and creating their own preview if one doesn't arrive soon enough (or if the original sender didn't create one)</li>
-</ul>
-<p>This is a bit magical though in that the preview could come from two entirely different sources - the sending HS or your local one.  However, this can always be exposed to users: &quot;Generate your own URL previews if none are available?&quot;</p>
-<p>This is tantamount also to senders calculating their own thumbnails for sending in advance of the main content - we are trusting the sender not to lie about the content in the thumbnail.  Whereas currently thumbnails are calculated by the receiving homeserver to avoid this attack.</p>
-<p>However, this kind of phishing attack does exist whether we let senders pick their thumbnails or not, in that a malicious sender can send normal text messages around the attachment claiming it to be legitimate.  We could rely on (future) reputation/abuse management to punish users who phish (be it with bogus metadata or bogus descriptions).   Bogus metadata is particularly bad though, especially if it's avoidable.</p>
-<p>As a first cut, let's do #2 and have the receiver hit the API to calculate its own previews (as it does currently for image thumbnails).  We can then extend/optimise this to option 4 as a special extra if needed.</p>
-<h2 id="api"><a class="header" href="#api">API</a></h2>
-<pre><code>GET /_matrix/media/r0/preview_url?url=http://wherever.com
-200 OK
-{
-    &quot;og:type&quot;        : &quot;article&quot;
-    &quot;og:url&quot;         : &quot;https://twitter.com/matrixdotorg/status/684074366691356672&quot;
-    &quot;og:title&quot;       : &quot;Matrix on Twitter&quot;
-    &quot;og:image&quot;       : &quot;https://pbs.twimg.com/profile_images/500400952029888512/yI0qtFi7_400x400.png&quot;
-    &quot;og:description&quot; : &quot;“Synapse 0.12 is out! Lots of polishing, performance &amp;amp;amp; bugfixes: /sync API, /r0 prefix, fulltext search, 3PID invites https://t.co/5alhXLLEGP”&quot;
-    &quot;og:site_name&quot;   : &quot;Twitter&quot;
-}
-</code></pre>
-<ul>
-<li>Downloads the URL
-<ul>
-<li>If HTML, just stores it in RAM and parses it for OG meta tags
-<ul>
-<li>Download any media OG meta tags to the media repo, and refer to them in the OG via mxc:// URIs.</li>
-</ul>
-</li>
-<li>If a media filetype we know we can thumbnail: store it on disk, and hand it to the thumbnailer. Generate OG meta tags from the thumbnailer contents.</li>
-<li>Otherwise, don't bother downloading further.</li>
-</ul>
-</li>
-</ul>
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