Fix usage of deprecated method sendSynchronousRequest:returningResponse:error:.

src/common/mac/HTTPMultipartUpload.m

 // Copyright (c) 2006, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
     (defined(MAC_OS_X_VERSION_MIN_REQUIRED) &&                                 \
      defined(MAC_OS_X_VERSION_10_11) &&                                        \
      MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_11)
   return [key stringByAddingPercentEncodingWithAllowedCharacters:
                   [NSCharacterSet URLQueryAllowedCharacterSet]];
 #else
   return [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
 #endif
 }
 
+// As -[NSURLConnection sendSynchronousRequest:returningResponse:error:] has
+// been deprecated with iOS 9.0 / OS X 10.11 SDKs, this function re-implements
+// it using -[NSURLSession dataTaskWithRequest:completionHandler:] when using
+// those SDKs.
+static NSData *SendSynchronousNSURLRequest(NSURLRequest *req,
+                                           NSURLResponse **out_response,
+                                           NSError **out_error) {
+#if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && defined(__IPHONE_9_0) &&     \
+     __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_9_0) ||                      \
+    (defined(MAC_OS_X_VERSION_MIN_REQUIRED) &&                                 \
+     defined(MAC_OS_X_VERSION_10_11) &&                                        \
+     MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_11)
+  __block NSData* result = nil;
+  __block NSError* error = nil;
+  __block NSURLResponse* response = nil;
+  dispatch_semaphore_t wait_semaphone = dispatch_semaphore_create(0);
+  [[[NSURLSession sharedSession]
+      dataTaskWithRequest:req
+        completionHandler:^(NSData *data,
+                            NSURLResponse *resp,
+                            NSError *err) {
+            if (out_error)
+              error = [err retain];
+            if (out_response)
+              response = [resp retain];
+            if (err == nil)
+              result = [data retain];
+            dispatch_semaphore_signal(wait_semaphone);
+  }] resume];
+  dispatch_semaphore_wait(wait_semaphone, DISPATCH_TIME_FOREVER);
+  dispatch_release(wait_semaphone);
+  if (out_error)
+    *out_error = [error autorelease];
+  if (out_response)
+    *out_response = [response autorelease];
+  return [result autorelease];
+#else
+  return [NSURLConnection sendSynchronousRequest:req
+                               returningResponse:out_response
+                                           error:out_error];
+#endif
+}
 @interface HTTPMultipartUpload(PrivateMethods)
 - (NSString *)multipartBoundary;
 // Each of the following methods will append the starting multipart boundary,
 // but not the ending one.
 - (NSData *)formDataForKey:(NSString *)key value:(NSString *)value;
 - (NSData *)formDataForFileContents:(NSData *)contents name:(NSString *)name;
 - (NSData *)formDataForFile:(NSString *)file name:(NSString *)name;
 @end
 
 @implementation HTTPMultipartUpload
@@ skipping 144 matching lines @@
   [req setHTTPMethod:@"POST"];
 
   [response_ release];
   response_ = nil;
 
   NSData *data = nil;
   if ([[req URL] isFileURL]) {
     [[req HTTPBody] writeToURL:[req URL] options:0 error:error];
   } else {
     NSURLResponse *response = nil;
-    data = [NSURLConnection sendSynchronousRequest:req
-                                 returningResponse:&response
-                                             error:error];
+    data = SendSynchronousNSURLRequest(req, &response, error);
     response_ = (NSHTTPURLResponse *)[response retain];
   }
   [req release];
 
   return data;
 }
 
 //=============================================================================
 - (NSHTTPURLResponse *)response {
   return response_;
 }
 
 @end