Handle download errors

OpenRA.Launcher.Mac/JSBridge.m

@@ -49,6 +49,7 @@ static JSBridge *SharedInstance;
 						@"startDownload", NSStringFromSelector(@selector(startDownload:)),
 						@"cancelDownload", NSStringFromSelector(@selector(cancelDownload:)),
 						@"downloadStatus", NSStringFromSelector(@selector(downloadStatus:)),
+						@"downloadError", NSStringFromSelector(@selector(downloadError:)),
 						@"bytesCompleted", NSStringFromSelector(@selector(bytesCompleted:)),
 						@"bytesTotal", NSStringFromSelector(@selector(bytesTotal:)),
 					nil] retain];
@@ -67,12 +68,6 @@ static JSBridge *SharedInstance;
 	[super dealloc];
 }
 
-- (void)notifyDownloadProgress:(Download *)download
-{
-	[[[controller webView] windowScriptObject] evaluateWebScript:
-		[NSString stringWithFormat:@"downloadProgressed('%@')",[download key]]];
-}
-
 #pragma mark JS API methods
 
 - (BOOL)launchMod:(NSString *)aMod
@@ -119,6 +114,15 @@ static JSBridge *SharedInstance;
 	return [d status];
 }
 
+- (NSString *)downloadError:(NSString *)key
+{
+	Download *d = [controller downloadWithKey:key];
+	if (d == nil)
+		return @"";
+	
+	return [d error];
+}
+
 - (BOOL)startDownload:(NSString *)key
 {
 	Download *d = [controller downloadWithKey:key];
@@ -143,6 +147,13 @@ static JSBridge *SharedInstance;
 	return (d == nil) ? -1 : [d bytesTotal];
 }
 
+- (void)notifyDownloadProgress:(Download *)download
+{
+	[[[controller webView] windowScriptObject] evaluateWebScript:
+	 [NSString stringWithFormat:@"downloadProgressed('%@')",[download key]]];
+}
+
+
 - (void)log:(NSString *)message
 {
 	NSLog(@"js: %@",message);