MDL-61485 authentication: Add callback 'pre_signup_requests'

login/lib.php

@@ -381,4 +381,16 @@ function core_login_validate_forgot_password_data($data) {
     }
 
     return $errors;
-}
+}
+
+/**
+ * Plugins can create pre sign up requests.
+ */
+function core_login_pre_signup_requests() {
+    $callbacks = get_plugins_with_function('pre_signup_requests');
+    foreach ($callbacks as $type => $plugins) {
+        foreach ($plugins as $plugin => $pluginfunction) {
+            $pluginfunction();
+        }
+    }
+}

login/signup.php

@@ -27,6 +27,7 @@
 require('../config.php');
 require_once($CFG->dirroot . '/user/editlib.php');
 require_once($CFG->libdir . '/authlib.php');
+require_once('lib.php');
 
 if (!$authplugin = signup_is_enabled()) {
     print_error('notlocalisederrormessage', 'error', '', 'Sorry, you may not use this page.');
@@ -59,6 +60,10 @@ if (isloggedin() and !isguestuser()) {
     exit;
 }
 
+// Plugins can create pre sign up requests.
+// Can be used to force additional actions before sign up such as acceptance of policies, validations, etc.
+core_login_pre_signup_requests();
+
 $mform_signup = $authplugin->signup_form();
 
 if ($mform_signup->is_cancelled()) {