See our demo plugin that illustrates the potential for a Mattermost plugin. To start writing your own plugin, consult our starter template.
Consider using a plugin in the following scenarios:
Plugins are fully supported in both Team Edition and Enterprise Edition.
The Marketplace is a collection of plugins that can greatly increase the value and capabilities of your Mattermost deployment. End users can see increased productivity through quick access to systems such as Jira, Zoom, Webex, and GitHub. Mattermost System Admins can discover new plugins and quickly deploy them to their servers, including High Availability clusters.
The Marketplace is available from v5.16 and is accessed via Product menu > Marketplace. More listings will be added as we add new features and plugins that our customers request.
Plugins in the Marketplace are labeled to make it easier for administrators to choose plugins that fit their company’s security and risk policies if they do not allow for community plugins to be used.
Plugins identified as “Community” are produced by the open-source community or partners and the features/roadmap are not controlled directly by Mattermost. Prior to being listed on the Marketplace, they are reviewed by the Mattermost development team and code-signed to ensure the code Mattermost reviewed, is delivered. Mattermost does not directly support these plugins in production environments.
Plugins may be labeled as “Beta” if they’re released to the Marketplace early for customer previews. We do not recommend running beta plugins on production servers.
Plugins labeled as “Experimental” are still being tested. These should not be run on production servers.
Plugins identified as “Partner” are created and maintained by a Mattermost partner.
When a new plugin becomes available on the Marketplace, it’s listed with an option to Install. Select Install to download and install the latest plugin binary from its respective GitHub repository. If there’s a cluster present, the plugin will be distributed to each server automatically.
Once a plugin is installed (or pre-installed if shipped with Mattermost binary release):
Upgrade a plugin on demand when a new version becomes available. New versions of plugins that you have already installed will display a link to easily install the upgraded plugins. Some plugin versions may have breaking changes; please check the release notes if you’re performing a major version change.
In v5.16 and v5.17 the Marketplace only supports the installation of new plugins. To upgrade a plugin, you need to manually update it by downloading the binary file from the GitHub repository and then upload it in System Console > Plugin Management.
There are two settings in System Console > Plugin Management:
When you first access the Marketplace, your Mattermost server will attempt to contact the Mattermost Marketplace server and return a list of available plugins that are appropriate based on the server version that is currently running. Only your server version and search query is passed over to the Mattermost Marketplace; we retain an anonymized record for product analytics whenever a new plugin is installed, unless you have opted out of Telemetry.
The Marketplace server code is available as an open source project and can be used to set up your own private Marketplace if desired.
The Mattermost Marketplace is a service run by Mattermost that contains listings of plugins that we have reviewed and, in many cases, built. In the future, we plan to include community-developed plugins that will be labeled separately to Mattermost-developed plugins. as well as settings that would restrict which types of plugins you can install. Comments in our forum are welcome as we develop this feature further.
There are many ways to integrate Mattermost aside from plugins, and we have created a directory of integration “recipes”, some of which are scripts, plugins, or instructions on how to connect Mattermost with your Enterprise systems. Many are sourced from our community of customers. You can browse the directory at https://integrations.mattermost.com.
Plugins may have one or both of the following parts:
RHS, or even rendering a custom post type within the center channel. All this is possible without having to fork the source code and rebase on every Mattermost release. For a sample plugin, see our Zoom plugin.
Plugins are intentionally powerful and not artificially sandboxed in any way and effectively become part of the Mattermost server. Server plugins can execute arbitrary code alongside your server and webapp plugins can deploy arbitrary code in client browsers.
While this power enables deep customization and integration, it can be abused in the wrong hands. Plugins have full access to your server configuration and thus also to your Mattermost database. Plugins can read any message in any channel, or perform any action on behalf of any user in the Web App.
You should only install custom plugins from sources you trust to avoid compromising the security of your installation.
The Marketplace allows System Admins to download and install plugins from a central repository. Plugins installed via the Marketplace must be signed by a public key certificate trusted by the local Mattermost server.
While the server ships with a default certificate used to verify plugins from the default Mattermost Marketplace, the server can be configured to trust different certificates and point at a different plugin marketplace. This document outlines the steps for generating a public key certificate and signing plugins for use with a custom plugin marketplace. It assumes access to the GNU Privacy Guard (GPG) tool.
Configuring plugin signatures allows finer control over the verification process:
PluginSettings.RequirePluginSignature = true
This is used to enforce plugin signature verification. With flag on, only Marketplace plugins will be installed and verified. With flag off, customers will be able to install plugins manually without signature verification.
Note that the Marketplace plugins will still be verified even if the flag is off.
Public and private key pairs are needed to sign and verify plugins. The private key is used for signing and should be kept in a secure location. The public key is used for verification and can be distributed freely. To generate a key pair, run the following command:
gpg --full-generate-key Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) Your selection? 1 RSA keys may be between 1024 and 4096 bits long. What keysize do you want? (2048) 3072 Requested keysize is 3072 bits Please specify how long the key should be valid. 0 = key does not expire <n> = key expires in n days <n>w = key expires in n weeks <n>m = key expires in n months <n>y = key expires in n years Key is valid for? (0) 0 Key expires at ... Is this correct? (y/N) y GnuPG needs to construct a user ID to identify your key. Real name: Mattermost Inc Email address: firstname.lastname@example.org Comment: You selected this USER-ID: "Mattermost Inc <email@example.com>" Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
Key size should be at least 3072 bits.
Find the ID of your private key first. The ID is a hexadecimal number.
This is your private key and should be kept secret. Your hexadecimal key ID will, of course, be different.
gpg --export-secret-keys F3FACE45E0DE642C8BD6A8E64C7C6562C192CC1F > ./my-priv-key
Find the ID of your public key first. The ID is a hexadecimal number.
gpg --export F3FACE45E0DE642C8BD6A8E64C7C6562C192CC1F > ./my-pub-key
If you already have a public and private key pair, you can import them to the GPG.
gpg --import ./my-priv-gpg-key
gpg --import ./my-pub-gpg-key
For plugin signing, you have to know the hexadecimal ID of the private key. Let’s assume you want to sign
com.mattermost.demo-plugin-0.1.0.tar.gz file, run:
gpg -u F3FACE45E0DE642C8BD6A8E64C7C6562C192CC1F --verbose --personal-digest-preferences SHA256 --detach-sign com.mattermost.demo-plugin-0.1.0.tar.gz
This command will generate
com.mattermost.demo-plugin-0.1.0.tar.gz.sig, which is the signature of your plugin.
Mattermost server will verify plugin signatures downloaded from the Marketplace. To add custom public keys, run the following command on the Mattermost server:
mattermost plugin add key my-pub-key
Multiple public keys can be added to the Mattermost server:
mattermost plugin add key my-pk-file1 my-pk-file2
To list the names of all public keys installed on your Mattermost server, use:
mattermost plugin keys
To delete public key(s) from your Mattermost server, use:
mattermost plugin delete key my-pk-file1 my-pk-file2
See the implementation document for more information.
To manage plugins, go to System Console > Plugins > Plugin Management. From here, you can:
Mattermost ships with a number of pre-packaged plugins written and maintained by Mattermost. Instead of building these features directly into the product, you can selectively enable the functionality your installation requires. Install pre-packaged plugins from the Marketplace, even if your system cannot directly connect to the internet.
Prior to v5.20, pre-packaged plugins were installed by default and could not be uninstalled without manually modifying the
prepackaged_plugins directory. Any pre-packaged plugins installed prior to v5.20 and left enabled on upgrade will remain installed, but can now be uninstalled.
Installing a custom plugin introduces some risk. As a result, plugin uploads are disabled by default and cannot be enabled via the System Console or REST API.
To enable plugin uploads, manually set
PluginSettings > EnableUploads to
true in your
config.json file and restart your server. You can disable plugin uploads at any time without affecting previously uploaded plugins.
With plugin uploads enabled, navigate to System Console > Plugins > Management and upload a plugin bundle. Plugin bundles are
*.tar.gz files containing the server executables and web app resources for the plugin. You can also specify a URL to install a plugin bundle from a remote source.
Custom plugins may also be installed via the command line interface.
While no longer recommended, plugins may also be installed manually by unpacking the plugin bundle inside the
plugins directory of a Mattermost installation.
Prior to Mattermost 5.14, Mattermost servers configured for High Availability mode required plugins to be installed manually. As of Mattermost 5.14, plugins uploaded via the System Console or the CLI are persisted to the configured file store and automatically installed on all servers that join the cluster.
Manually installed plugins remain supported, but must be individually installed on each server in the cluster.
Join our community server discussion in the Toolkit channel.
Please see common questions below. For further assistance, review the Troubleshooting forum for previously reported errors, or join the Mattermost user community for troubleshooting help.
If plugin uploads fail and you see
permission denied errors in System Console > Logs such as:
[2017/11/13 20:42:18 UTC] [EROR] failed to start up plugins: mkdir /home/ubuntu/mattermost/client/plugins: permission denied
It’s likely that the Mattermost server doesn’t have the necessary permissions for uploading plugins. Ensure the Mattermost server has write access to the
It may also be that the working directory for the service running Mattermost is not correct. On Ubuntu you might see:
[2018/01/03 08:34:47 EST] [EROR] failed to start up plugins: mkdir ./client/plugins: no such file or directory
This can be fixed on Ubuntu 16.04 and RHEL by opening the service configuration file and setting
WorkingDirectory to the path to Mattermost (generally it’s
A similar problem can occur on Windows:
[EROR] failed to start up plugins: mkdir ./client/plugins: The system cannot find the path specified.
To fix this, set the
AppDirectory of your service using
nssm set mattermost AppDirectory c:\mattermost.
x509: certificate signed by unknown authority
If you’re seeing
x509: certificate signed by unknown authority in your server logs, it usually means that the CA for a self-signed certificate for a server your plugin is trying to access has not been added to your local trust store of the machine the Mattermost server is running on.
You can add one in Linux following instructions in this StackExchange article, or set up a load balancer like NGINX per production install guide to resolve the issue.
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