Create a specific message for CORS failure in cross-wiki API request

Bug: T123797
Change-Id: I877c826a5571fb1f664af496b9b3469aa24884f6

Resources.php

@@ -127,6 +127,7 @@ $wgResourceModules += array(
 		),
 		'messages' => array(
 			'echo-api-failure',
+			'echo-api-failure-cross-wiki',
 		),
 		'targets' => array( 'desktop', 'mobile' ),
 	),

i18n/en.json

@@ -53,6 +53,7 @@
 	"echo-feedback": "Feedback",
 	"echo-quotation-marks": "\"$1\"",
 	"echo-api-failure": "Could not retrieve notifications. Please try again. (Error $1)",
+	"echo-api-failure-cross-wiki": "Access to the remote domain was denied.",
 	"echo-notification-placeholder": "There are no notifications.",
 	"echo-notification-loginrequired": "You must login to see your notifications.",
 	"echo-notification-popup-loginrequired": "Please log in to view your notifications.",

i18n/qqq.json

@@ -74,6 +74,7 @@
 	"echo-feedback": "Text for a link that goes to a feedback survey shown at [[Special:Notifications]].\n{{Identical|Feedback}}",
 	"echo-quotation-marks": "Unused at this time.\n\n{{optional}}\nPuts the edit summary in quotation marks. Only translate if different than English.\n\nParameters:\n* $1 - ...",
 	"echo-api-failure": "Label for the text that notes an error in retrieving notifications for the Echo popup.\n$1 - The api error code.",
+	"echo-api-failure-cross-wiki": "Label for the api failure text for a failure to fetch cross-wiki notifications, but the remote server is not granted access.",
 	"echo-notification-placeholder": "Label for the text that appears if there are no notifications in the Echo popup.",
 	"echo-notification-loginrequired": "Message that displays when an anonymous user attempts to view notifications and gets redirect to the login page.",
 	"echo-notification-popup-loginrequired": "Message that displays when an anonymous user attempts to view notifications in their popup after a session expired.",

modules/viewmodel/mw.echo.dm.NotificationsModel.js

@@ -562,7 +562,17 @@
 				},
 				// Failure
 				function ( errCode, errObj ) {
-					model.emit( 'done', false, { errCode: errCode, errInfo: OO.getProp( errObj, 'error', 'info' ) } );
+					// TODO: The 'analysis' of which error we are working with should
+					// be in the network layer of Echo's frontend code
+					model.emit(
+						'done',
+						false,
+						{
+							errCode: errCode,
+							errInfo: errCode === 'http' ?
+								mw.msg( 'echo-api-failure-cross-wiki' ) :
+								OO.getProp( errObj, 'error', 'info' )
+						} );
 				}
 			);
 	};