GUACAMOLE-210: Add remaining endpoint properties.

extensions/guacamole-auth-openid/src/main/java/org/apache/guacamole/auth/oauth/conf/ConfigurationService.java

@@ -50,6 +50,22 @@ public class ConfigurationService {
         return environment.getRequiredProperty(OAuthGuacamoleProperties.OAUTH_AUTHORIZATION_ENDPOINT);
     }
 
+    /**
+     * Returns the token endpoint (URI) of the OAuth service as configured with
+     * guacamole.properties.
+     *
+     * @return
+     *     The token endpoint of the OAuth service, as configured with
+     *     guacamole.properties.
+     *
+     * @throws GuacamoleException
+     *     If guacamole.properties cannot be parsed, or if the authorization
+     *     endpoint property is missing.
+     */
+    public String getTokenEndpoint() throws GuacamoleException {
+        return environment.getRequiredProperty(OAuthGuacamoleProperties.OAUTH_TOKEN_ENDPOINT);
+    }
+
     /**
      * Returns the OAuth client ID which should be submitted to the OAuth
      * service when necessary, as configured with guacamole.properties. This

extensions/guacamole-auth-openid/src/main/java/org/apache/guacamole/auth/oauth/conf/OAuthGuacamoleProperties.java

@@ -44,6 +44,17 @@ public class OAuthGuacamoleProperties {
 
     };
 
+    /**
+     * The token endpoint (URI) of the OAuth service.
+     */
+    public static final StringGuacamoleProperty OAUTH_TOKEN_ENDPOINT =
+            new StringGuacamoleProperty() {
+
+        @Override
+        public String getName() { return "oauth-token-endpoint"; }
+
+    };
+
     /**
      * OAuth client ID which should be submitted to the OAuth service when
      * necessary. This value is typically provided by the OAuth service when