Issue #2619262 by epicflux, snufkin: Allow Modules to Alter $gotourl …

…on User Logout

simplesamlphp_auth.api.php

@@ -70,3 +70,39 @@ function hook_simplesamlphp_auth_pre_login($attributes, $ext_user) {
     exit();
   }
 }
+
+/**
+ * Allow modules to change the url passed to simplesamlphp during logout.
+ *
+ * Called when a user logs out of Drupal.
+ *
+ * @param string $gotourl
+ *   The url to be passed to simplesamlphp.
+ * @param object $account
+ *   The user being logged out.
+ */
+function hook_simplesamlphp_auth_logout_gotourl_alter(&$gotourl, $account) {
+  // Example of reacting to a value on the account.
+  if ($account->field_example == 'example_value') {
+    $gotourl = url(
+      'thanks-for-stopping-by',
+      array(
+        'absolute' => TRUE,
+      )
+    );
+  }
+
+  // Example of adding the destination value to the redirect URL.
+  if (isset($_GET['destination'])) {
+    // Ensure our redirect URL is absolute.
+    $redirect_url = url(
+      $_GET['destination'],
+      array(
+        'absolute' => TRUE,
+      )
+    );
+
+    // Add our redirect URL as a querystring to the full URL.
+    $gotourl = $gotourl . '?redirect=' . drupal_encode_path($redirect_url);
+  }
+}

simplesamlphp_auth.module

@@ -250,6 +250,9 @@ function simplesamlphp_auth_user_logout($account) {
       $gotourl = variable_get('simplesamlphp_auth_logoutgotourl', '');
     }
 
+  // Allow modules to alter $gotourl.
+  drupal_alter('simplesamlphp_auth_logout_gotourl', $gotourl, $account);
+
     $_simplesamlphp_auth_as->logout($gotourl);
 
   }