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Document Synapse's behaviour when multiple modules register the same callback/web resource/etc. Co-authored-by: reivilibre <oliverw@matrix.org>
53 lines
2 KiB
Markdown
53 lines
2 KiB
Markdown
# Modules
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Synapse supports extending its functionality by configuring external modules.
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**Note**: When using third-party modules, you effectively allow someone else to run
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custom code on your Synapse homeserver. Server admins are encouraged to verify the
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provenance of the modules they use on their homeserver and make sure the modules aren't
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running malicious code on their instance.
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## Using modules
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To use a module on Synapse, add it to the `modules` section of the configuration file:
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```yaml
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modules:
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- module: my_super_module.MySuperClass
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config:
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do_thing: true
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- module: my_other_super_module.SomeClass
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config: {}
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```
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Each module is defined by a path to a Python class as well as a configuration. This
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information for a given module should be available in the module's own documentation.
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## Using multiple modules
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The order in which modules are listed in this section is important. When processing an
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action that can be handled by several modules, Synapse will always prioritise the module
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that appears first (i.e. is the highest in the list). This means:
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* If several modules register the same callback, the callback registered by the module
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that appears first is used.
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* If several modules try to register a handler for the same HTTP path, only the handler
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registered by the module that appears first is used. Handlers registered by the other
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module(s) are ignored and Synapse will log a warning message about them.
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Note that Synapse doesn't allow multiple modules implementing authentication checkers via
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the password auth provider feature for the same login type with different fields. If this
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happens, Synapse will refuse to start.
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## Current status
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We are currently in the process of migrating module interfaces to this system. While some
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interfaces might be compatible with it, others still require configuring modules in
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another part of Synapse's configuration file.
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Currently, only the following pre-existing interfaces are compatible with this new system:
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* spam checker
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* third-party rules
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* presence router
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* password auth providers
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