Extension:GoogleLogin

The GoogleLogin extension allows wiki users to login with their Google account. The extension uses the Google API to request basic profile information from Google (such as the account ID, the full name and the email address).

Requirements
To use this extension you need at least:


 * MediaWiki 1.36+
 * MySQL/MariaDB (no PostgreSQL or SQLite support)
 * PHP 7.3+


 * [ https://developers.google.com/console/help/new/ Google Developer] Access


 * API Credentials for Webapplication (Client ID and Client Secret)


 * Able to run

Configuration
The extension provides two configuration variables to set the Client ID and Client Secret (you get this pair in the Google Developer Console, remove "<" and ">").

Settings in Google Developer Console
To use this extension you need a Google developer account and access to the [ https://console.developers.google.com developer console]. This is a very simple step-by-step guide (see also [ https://developers.google.com/identity/sign-in/web/sign-in?hl=en Googles help page on this]):


 * 1) Open Google developer console


 * 1) Read and accept the terms of service


 * 1) Create your first project


 * 1) Go to APIs and services


 * 1) Click + CREATE CREDENTIALS


 * 1) Select OAuth client ID


 * 1) Select as Web application as APPLICATION TYPE, as Authorized JavaScript origins type in your domain name (no wildcards and directories allowed!)


 * 1) Type in your Authorized redirect URI like this example:


 * If your domain is example.com and you have installed MediaWiki in Root of your domain, the redirect URI is as follows: https://example.com/index.php/Special:GoogleLoginReturn


 * 1) Click create and copy the Client ID and Client Secret to the configuration variables in LocalSettings.php

Special page "Special:GoogleLoginReturn"
The allowed redirect URI in Google developer console must be in the wiki's content language. So, if your wiki was set to German as the content language, then use. If you used the wrong language, all authentication requests will fail with the error code redirect uri mismatch.

Debugging
Normally, you can see the error message on all generic error pages. Sometimes there are Internal Errors, called Exceptions. In this case, please add with value true in LocalSettings.php to see the complete Exception message. For a support request, please provide always the lines of the Exception.

Use on a private wiki
If you have set your Wiki to private with

you have to whitelist the "Special:GoogleLoginReturn" page, so that anonymous users can access the callback URL after being redirected from the authentication provider. You can do this by adding the following line to your LocalSettings.php:

The name of the special page must be in the wiki's content language. If your wiki was e.g. set to German as the content language, then use. In case you used the wrong language, all authentication requests will fail and redirect you to "Special:Login".

Administer allowed domains on-wiki
GoogleLogin provides a feature to restrict the login with Google to specific Email address domains (such as gmail.com, googlemail.com or every other (own) domain). This feature is especially interesting for companies, who use their own domain names with Google Apps. The list of domains, which are allowed to login with Google, are managed in an array in the LocalSettings.php (the  configuration option). Since version 0.4.0, GoogleLogin also provides a way to manage the list of allowed domains on the wiki itself. The allowed domains are saved in the database when this feature is enabled and can be change (remove/add) through a graphical user interface (a special page) or through the MediaWiki API.

Note: The list of allowed domains cannot be managed in LocalSettings.php anymore, once the administration of the domains in the database is enabled.

To enable the feature to manage the allowed domains in the database, just set the  configuration variable to   in your LocalSettings.php. You also want to assign the new  user right to one group you're a member of (please keep in mind, that all users with this user right are allowed to change the list of allowed domains, so consider to add this right to an administrator-level group only!). An example configuration could look like:

You now need to run the script again, so that the necessary database changes are applied to your database. After the update process is completed, you can navigate to the special page  on your wiki. You'll get a page where you can add new domains, which are allowed to login with their Google account and you can remove them, once they was added.

Configuration parameter "$wgGLAPIKey"
This configuration option still exists, but it's now used for more than just the Special:ManageGoogleLogin special page. It's now used to get the name of a user on Special:RemoveCredentials to make it easier to the user to identify the correct Google account (instead of just showing the Google ID). If the key isn't correct or isn't supplied, GoogleLogin will show the Google ID only. For a good user experience, it's highly suggested to supply this api key now.

Authoritative mode
Google Login supports a so called authoritative mode, in which, when enabled, a user account is automatically created when the Google account, which was used to login, is not associated with a local MediaWiki account already. This option is disabled by default and needs to be enabled with a configuration option. However, please read the following important information before doing so. This feature requires that the wiki's configuration strictly supports the following:


 * GoogleLogin needs to be the only primary authentication provider, e.g. set


 * The @ sign needs to be whitelisted in the  configuration and adapt  accordingly, e.g.


 * Autocreation of accounts needs to be enabled:


 * The GoogleLogin authoritative mode needs to be enabled:

Enabling this feature also has the following influence:


 * The username of the account is the primary email field of the returned information from Google. This is not configurable.


 * If a local wiki account is already connected, this account is used to login, which means that an already existing account takes precedence over creating a new one.


 * The new created account will automatically be linked with the Google account.


 * GoogleLogin will not let a user add or remove any further Google account connections (or the automatically created link) to prevent a user from being not able to login anymore.


 * GoogleLogin does not add a password during the account creation, if the authoritative mode is disabled and password login shall be enabled again, the user needs to reset their password.

Google API PHP Client
This Extension uses the Google API PHP Client (included in versions before 0.2.1), distributed under the Apache 2.0 License. The Client can be downloaded from GitHub.

updatePublicSuffixArray.php
The maintenance script downloads a list of domain names which are valid to be used in the world. This is required in order for GoogleLogin to allow subdomains of a specific email domain when you've restricted the login with GoogleLogin for specific domains. This is only needed if is set to false (which is the default).

Version lifecycle
Please note that I support only the latest version of GoogleLogin. Any versions apart from the current release (which means the current MediaWiki release branch) and the current development version (aka master) are not supported anymore.