Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/OmahaXMLParser.m

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "OmahaXMLParser.h"
+
+@implementation OmahaXMLParser
+
+- (NSMutableArray*)chromeIncompleteDownloadURLs {
+  return chromeIncompleteDownloadURLs_;
+}
+
+- (NSString*)chromeImageFilename {
+  return chromeImageFilename_;
+}
+
+// Sets up instance of NSXMLParser and calls on delegate methods to do actual
+// parsing work.
+- (NSArray*)parseXML:(NSData*)omahaResponseXML error:(NSError**)error {
+  NSXMLParser* parser = [[NSXMLParser alloc] initWithData:omahaResponseXML];
+  [parser setDelegate:self];
+  BOOL success = [parser parse];
+  if (!success) {
+    *error = [parser parserError];
+  }
+
+  return chromeIncompleteDownloadURLs_;
+}
+
+// Method implementation for XMLParserDelegate.
+// Searches the XML data for the tag "URL" and the subsequent "codebase"
+// attribute that indicates a URL follows. Copies each URL into an array.
+// Note that the URLs in the XML file are incomplete. They need the filename
+// appended to end. The second if statement checks for the tag "package" which
+// contains the filename we need to complete the URLs.
+- (void)parser:(NSXMLParser*)parser
+    didStartElement:(NSString*)elementName
+       namespaceURI:(NSString*)namespaceURI
+      qualifiedName:(NSString*)qName
+         attributes:(NSDictionary*)attributeDict {
+  if ([elementName isEqualToString:@"url"]) {
+    if (!chromeIncompleteDownloadURLs_) {
+      chromeIncompleteDownloadURLs_ = [[NSMutableArray alloc] init];
+    }
+    NSString* extractedURL = [attributeDict objectForKey:@"codebase"];
+    [chromeIncompleteDownloadURLs_ addObject:extractedURL];
+  }
+  if ([elementName isEqualToString:@"package"]) {
+    chromeImageFilename_ = [[NSString alloc]
+        initWithFormat:@"%@", [attributeDict objectForKey:@"name"]];
+  }
+}
+
+@end