Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/NetworkCommunication.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 <Foundation/Foundation.h>
+#include "NetworkCommunication.h"
+
+@implementation NetworkCommunication : NSObject
+
+// The following variables each have getters and setters, so when this class
+// is in use, please don't forget to set the response handler!
+@synthesize session;

[Mark Mentovai, 2016/07/07 17:53:48]

Please name the variables that back your properties with trailing underscores,
like

@synthesize session = session_;

That helps us see elsewhere in the code when we’re working with an instance
variable.

+@synthesize request;
+@synthesize dataResponseHandler;
+@synthesize downloadResponseHandler;
+
+- (id)init {
+  return [self initWithDelegate:nil];
+}
+
+- (id)initWithDelegate:(id) delegate {
+  if ((self = [super init])) {
+    NSURLSessionConfiguration* sessionConfig = [NSURLSessionConfiguration

[Mark Mentovai, 2016/07/07 17:53:48]

Both sessionConfig and session are autoreleased, so you can’t really stash them
in instance variables.

+                                                defaultSessionConfiguration];
+    session = [NSURLSession sessionWithConfiguration:sessionConfig
+                                                          delegate:delegate
+                                                     delegateQueue:nil];
+  }
+  return self;
+}
+
+- (NSMutableURLRequest*)createRequestWithURLasString:(NSString*) urlString
+                                          andXMLBody:(NSXMLDocument*) body {
+  if (request) {

[Mark Mentovai, 2016/07/07 17:53:48]

When would this ever happen?

+    [request autorelease];
+  }
+  NSURL* requestURL = [NSURL URLWithString:urlString];
+  request = [NSMutableURLRequest requestWithURL:requestURL];
+  if (body) {
+    [request addValue:@"text/xml" forHTTPHeaderField:@"Content-Type"];
+    NSData* requestBody = [[body XMLString]
+                           dataUsingEncoding:NSUTF8StringEncoding];
+    request.HTTPBody = requestBody;
+  }
+  return request;
+}
+
+- (void)sendDataRequestWithCompletionHandler:
+                (DataTaskCompletionHandler) completionHandler {
+  dataResponseHandler = completionHandler;
+  NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request
+      completionHandler:dataResponseHandler];
+
+  [dataTask resume];
+  return;
+}
+
+- (void)sendDownloadRequest {
+  NSURLSessionDownloadTask* downloadTask;
+  if (downloadResponseHandler) {
+    downloadTask =
+    [session downloadTaskWithRequest:request
+                   completionHandler:downloadResponseHandler];
+  } else {
+    downloadTask =
+      [session downloadTaskWithRequest:request];
+  }
+  [downloadTask resume];
+
+  return;
+}
+
+@end