Put app shim IPC socket in a temporary directory. (Mac)

apps/app_shim/chrome_main_app_mode_mac.mm

 // Copyright 2013 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.
 
 // On Mac, one can't make shortcuts with command-line arguments. Instead, we
 // produce small app bundles which locate the Chromium framework and load it,
 // passing the appropriate data. This is the entry point into the framework for
 // those app bundles.
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 
 #include "apps/app_shim/app_shim_messages.h"
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/file_util.h"
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/launch_services_util.h"
 #include "base/mac/mac_logging.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 75 matching lines @@
   // was sent, or when the ping fails (if |success| is false).
   void OnPingChromeReply(bool success);
 
   // Called |kPingChromeTimeoutSeconds| after startup, to allow a timeout on the
   // ping event to be detected.
   void OnPingChromeTimeout();
 
   // Connects to Chrome and sends a LaunchApp message.
   void Init();
 
+  // Create a channel from |socket_path| and send a LaunchApp message.
+  // This may be called multiple times at startup to try to connect to different
+  // paths.
+  void CreateChannelAndSendLaunchApp(const base::FilePath& socket_path);
+
   // Builds main menu bar items.
   void SetUpMenu();
 
   void SendSetAppHidden(bool hidden);
 
   void SendQuitApp();
 
   // Called when the app is activated, e.g. by clicking on it in the dock, by
   // dropping a file on the dock icon, or by Cmd+Tabbing to it.
   // Returns whether the message was sent.
@@ skipping 11 matching lines @@
 
   // Hide this app.
   void OnHide();
 
   // Requests user attention.
   void OnRequestUserAttention();
 
   // Terminates the app shim process.
   void Close();
 
-  IPC::ChannelProxy* channel_;
+  base::FilePath user_data_dir_;
+  scoped_ptr<IPC::ChannelProxy> channel_;
   base::scoped_nsobject<AppShimDelegate> delegate_;
   bool launch_app_done_;
   bool ping_chrome_reply_received_;
 
   DISALLOW_COPY_AND_ASSIGN(AppShimController);
 };
 
 AppShimController::AppShimController()
-    : channel_(NULL),
-      delegate_([[AppShimDelegate alloc] init]),
+    : delegate_([[AppShimDelegate alloc] init]),
       launch_app_done_(false),
       ping_chrome_reply_received_(false) {
   // Since AppShimController is created before the main message loop starts,
   // NSApp will not be set, so use sharedApplication.
   [[NSApplication sharedApplication] setDelegate:delegate_];
 }
 
 AppShimController::~AppShimController() {
   // Un-set the delegate since NSApplication does not retain it.
   [NSApp setDelegate:nil];
@@ skipping 18 matching lines @@
   DCHECK(g_io_thread);
 
   SetUpMenu();
 
   // Chrome will relaunch shims when relaunching apps.
   if (base::mac::IsOSLionOrLater())
     [NSApp disableRelaunchOnLogin];
 
   // The user_data_dir for shims actually contains the app_data_path.
   // I.e. <user_data_dir>/<profile_dir>/Web Applications/_crx_extensionid/
-  base::FilePath user_data_dir =
-      g_info->user_data_dir.DirName().DirName().DirName();
-  CHECK(!user_data_dir.empty());
+  user_data_dir_ = g_info->user_data_dir.DirName().DirName().DirName();
+  CHECK(!user_data_dir_.empty());
 
-  base::FilePath socket_path =
-      user_data_dir.Append(app_mode::kAppShimSocketName);
+  base::FilePath symlink_path =
+      user_data_dir_.Append(app_mode::kAppShimSocketName);
+
+  base::FilePath socket_path;
+  if (!base::ReadSymbolicLink(symlink_path, &socket_path)) {
+    CreateChannelAndSendLaunchApp(symlink_path);

[tapted, 2014/01/03 13:06:54]

nit: maybe a comment here: ~"if the path in the user data dir is not a symlink,
try connecting directly"

[jackhou1, 2014/01/06 05:29:52]

Done.

+    return;
+  }
+
+  app_mode::VerifySocketPermissions(socket_path);
+
+  CreateChannelAndSendLaunchApp(socket_path);
+}
+
+void AppShimController::CreateChannelAndSendLaunchApp(
+    const base::FilePath& socket_path) {
   IPC::ChannelHandle handle(socket_path.value());
-  channel_ = new IPC::ChannelProxy(handle, IPC::Channel::MODE_NAMED_CLIENT,
-      this, g_io_thread->message_loop_proxy().get());
+  channel_.reset(new IPC::ChannelProxy(handle, IPC::Channel::MODE_NAMED_CLIENT,
+      this, g_io_thread->message_loop_proxy().get()));
 
   bool launched_by_chrome =
       CommandLine::ForCurrentProcess()->HasSwitch(
           app_mode::kLaunchedByChromeProcessId);
   apps::AppShimLaunchType launch_type = launched_by_chrome ?
           apps::APP_SHIM_LAUNCH_REGISTER_ONLY : apps::APP_SHIM_LAUNCH_NORMAL;
 
   [delegate_ setController:this];
 
   std::vector<base::FilePath> files;
@@ skipping 426 matching lines @@
     // minute.
     main_message_loop.PostTask(
         FROM_HERE,
         base::Bind(&AppShimController::Init,
                    base::Unretained(&controller)));
   }
 
   main_message_loop.Run();
   return 0;
 }