Plugin: OAuth2: Improve message when user creation is not enabled - refs BT#19734

plugin/oauth2/lang/english.php

@@ -124,7 +124,7 @@ $strings['FailedUserCreation'] = 'User account creation failed';
 $strings['InternalErrorCannotGetUserInfo'] = 'Internal error: could not get user information';
 $strings['InvalidJsonReceivedFromProvider'] = 'The OAuth2 provider did not provide a valid JSON document';
 $strings['ManagementLogin'] = 'Management Login';
-$strings['NoUserHasThisOauthCode'] = 'No existing user has this OAuth2 code';
+$strings['NoUserAccountAndUserCreationNotAllowed'] = 'This user doesn\'t have an account yet and auto-provisioning is not enabled. Please contact this portal administration team at %s to request access.';
 $strings['OAuth2Id'] = 'OAuth2 identifier';
 $strings['UserNotAllowedOnThisPortal'] = 'This user account is not enabled on this portal';
 $strings['WrongResponseResourceOwnerId'] = 'OAuth2 resource owner identifier value not found at the configured key';

plugin/oauth2/src/OAuth2.php

@@ -207,7 +207,14 @@ class OAuth2 extends Plugin
         if (false === $result) {
             // authenticated user not found in internal database
             if ('true' !== $this->get(self::SETTING_CREATE_NEW_USERS)) {
-                throw new RuntimeException($this->get_lang('NoUserHasThisOauthCode'));
+                throw new RuntimeException(
+                    sprintf(
+                        $this->get_lang('NoUserAccountAndUserCreationNotAllowed'),
+                        Display::encrypted_mailto_link(
+                            api_get_setting('emailAdministrator')
+                        )
+                    )
+                );
             }
 
             $firstName = $this->getValueByKey(