Virtual Cloud Print Driver for Mac.

chrome/service/chrome_service_application_mac.mm

+// Copyright (c) 2011 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 "chrome/service/chrome_service_application_mac.h"
+
+#include "base/logging.h"
+#include "base/mac/foundation_util.h"
+#import "content/common/cloud_print_class_mac.h"
+#include "chrome/common/chrome_switches.h"
+
+@interface ServiceCrApplication ()
+- (void)setCloudPrintHandler;
+- (void)submitPrint:(NSAppleEventDescriptor*)event;
+@end
+
+@implementation ServiceCrApplication
+
+-(void)setCloudPrintHandler {
+  NSAppleEventManager* em = [NSAppleEventManager sharedAppleEventManager];
+  [em setEventHandler:self
+          andSelector:@selector(submitPrint:)
+        forEventClass:content::kAECloudPrintClass
+           andEventID:content::kAECloudPrintClass];
+}
+
+// Event handler for Cloud Print Event. Forwards print job received to Chrome,
+// launching Chrome if necessary. Used to beat CUPS sandboxing.
+- (void)submitPrint:(NSAppleEventDescriptor*)event {
+  std::string silent = std::string("--") + switches::kNoStartupWindow;
+  // Set up flag so that it can be passed along with the Apple Event.
+  CFStringRef silentLaunchFlag =
+      CFStringCreateWithCString(NULL, silent.c_str(), kCFStringEncodingUTF8);
+  CFStringRef flags[] = { silentLaunchFlag };
+  // Argv array that will be passed.
+  CFArrayRef passArgv =
+      CFArrayCreate(NULL, (const void**) flags, 1, &kCFTypeArrayCallBacks);
+  FSRef ref;
+  OSStatus status = noErr;
+  CFURLRef* kDontWantURL = NULL;
+  // Get Chrome's bundle ID.
+  std::string bundleID =  base::mac::BaseBundleID();
+  CFStringRef bundleIDCF =
+      CFStringCreateWithCString(NULL, bundleID.c_str(), kCFStringEncodingUTF8);
+  // Use Launch Services to locate Chrome using its bundleID.
+  status = LSFindApplicationForInfo(kLSUnknownCreator, bundleIDCF,
+                                    NULL, &ref, kDontWantURL);
+
+  if (status != noErr) {
+    LOG(ERROR) << "Failed to make path ref";
+    LOG(ERROR) << GetMacOSStatusErrorString(status);
+    LOG(ERROR) << GetMacOSStatusCommentString(status);
+    return;
+  }
+  // Actually create the Apple Event.
+  NSAppleEventDescriptor* sendEvent =
+      [NSAppleEventDescriptor
+           appleEventWithEventClass:content::kAECloudPrintClass
+                            eventID:content::kAECloudPrintClass
+                   targetDescriptor:nil
+                           returnID:kAutoGenerateReturnID
+                      transactionID:kAnyTransactionID];
+  // Pull the parameters out of AppleEvent sent to us and attach them
+  // to our Apple Event.
+  NSAppleEventDescriptor* parameters =
+      [event paramDescriptorForKeyword:content::kAECloudPrintClass];
+  [sendEvent setParamDescriptor:parameters
+                     forKeyword:content::kAECloudPrintClass];
+  LSApplicationParameters params = { 0,
+                                     kLSLaunchDefaults,
+                                     &ref,
+                                     NULL,
+                                     NULL,
+                                     passArgv,
+                                     NULL };
+  AEDesc* initialEvent = const_cast<AEDesc*> ([sendEvent aeDesc]);
+  params.initialEvent = static_cast<AppleEvent*> (initialEvent);
+  // Send the Apple Event Using launch services, launching Chrome if necessary.
+  status = LSOpenApplication(&params, NULL);
+  if (status != noErr) {
+    LOG(ERROR) << "Unable to launch";
+    LOG(ERROR) << GetMacOSStatusErrorString(status);
+    LOG(ERROR) << GetMacOSStatusCommentString(status);
+  }
+}
+
+
+@end
+
+
+namespace chrome_service_application_mac {
+
+void RegisterServiceCrApp() {
+  ServiceCrApplication* var =
+      static_cast<ServiceCrApplication*>
+          ([ServiceCrApplication sharedApplication]);
+  [var setCloudPrintHandler];
+}
+
+}  // namespace chrome_service_application_mac
+