Wordpress identity store (#67)

docs/backends/README.md

@@ -2,4 +2,5 @@
 - [Samba / Active Directory / LDAP](ldap.md)
 - [SQL Databases](sql.md)
 - [Website / Web service / Web app](rest.md)
-- [Google Firebase](firebase.md)
+- [Google Firebase](firebase.md)
+- [Wordpress](wordpress.md)

docs/backends/wordpress.md

@@ -0,0 +1,55 @@
+# Wordpress
+This Identity store allows you to use user accounts registered on your Wordpress setup.  
+Two types of connections are required for full support:
+- [REST API](https://developer.wordpress.org/rest-api/) with JWT authentication
+- Direct SQL access
+
+This Identity store supports the following features:
+- [Authentication](../features/authentication.md)
+- [Directory](../features/directory-users.md)
+- [Identity](../features/identity.md)
+
+## Requirements
+- [Wordpress](https://wordpress.org/download/) >= 4.4
+- Permalink structure set to `Post Name`
+- [JWT Auth plugin for REST API](https://wordpress.org/plugins/jwt-authentication-for-wp-rest-api/)
+- SQL Credentials to the Wordpress Database
+
+## Configuration
+### Wordpress
+#### JWT Auth
+Set a JWT secret into `wp-config.php` like so:
+```
+define('JWT_AUTH_SECRET_KEY', 'your-top-secret-key');
+```
+`your-top-secret-key` should be set to a randomly generated value which is kept secret.
+
+#### Rewrite of `index.php`
+Wordpress is normally configured with rewrite of `index.php` so it does not appear in URLs.  
+If this is not the case for your installation, the mxisd URL will need to be appended with `/index.php`
+
+### mxisd
+Enable in the configuration:
+```
+wordpress.enabled: true
+```
+Configure the URL to your Wordpress installation - see above about added `/index.php`:
+```
+wordpress.rest.base: 'http://localhost:8080'
+```
+Configure the SQL connection to your Wordpress database:
+```
+wordpress.sql.connection: '//127.0.0.1/wordpress?user=root&password=example'
+```
+
+---
+
+By default, MySQL database is expected. If you use another database, use:
+```
+wordpress.sql.type: 'jdbc-scheme'
+```
+With possible values:
+- `mysql`
+- `mariadb`
+- `postgresql`
+- `sqlite`