Implement RemovableDeviceNotifications for Mac

chrome/browser/system_monitor/disk_info_mac.mm

+// Copyright (c) 2012 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.
+
+#include "chrome/browser/system_monitor/disk_info_mac.h"
+
+#include "base/mac/foundation_util.h"
+#include "base/sys_string_conversions.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/system_monitor/media_device_notifications_utils.h"
+#include "chrome/browser/system_monitor/media_storage_util.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace chrome {
+namespace {
+
+string16 GetUTF16FromDictionary(CFDictionaryRef dictionary, CFStringRef key) {
+  CFStringRef value =
+      base::mac::GetValueFromDictionary<CFStringRef>(dictionary, key);
+  return base::SysCFStringRefToUTF16(value);
+}
+
+string16 JoinName(const string16& name, const string16& addition) {
+  if (addition.empty())
+    return name;
+  if (name.empty())
+    return addition;
+  return name + ASCIIToUTF16(" ") + addition;
+}
+
+MediaStorageUtil::Type GetDeviceType(bool is_removable, bool has_dcim) {
+  if (is_removable) {
+    if (has_dcim) {
+      return MediaStorageUtil::REMOVABLE_MASS_STORAGE_WITH_DCIM;
+    } else {
+      return MediaStorageUtil::REMOVABLE_MASS_STORAGE_NO_DCIM;
+    }
+  } else {
+    return MediaStorageUtil::FIXED_MASS_STORAGE;
+  }

[Nico, 2012/09/10 07:02:34]

nit: gets a bit shorter with early outs:

if (!is_removable)
  return fixed_mass;
if (has_dcim)
  return removable_dcim
return removable_no_dcim

[sail, 2012/09/10 21:58:43]

Done.

+}
+
+}  // namespace
+
+DiskInfoMac::DiskInfoMac() {
+}
+
+DiskInfoMac::~DiskInfoMac() {
+}
+
+// static
+DiskInfoMac DiskInfoMac::BuildDiskInfoOnFileThread(CFDictionaryRef dict) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+  DiskInfoMac info;
+
+  CFStringRef bsd_name = base::mac::GetValueFromDictionary<CFStringRef>(
+      dict, kDADiskDescriptionMediaBSDNameKey);
+  info.bsd_name_ = base::SysCFStringRefToUTF8(bsd_name);

[Nico, 2012/09/10 07:02:34]

I'd do the null checking here instead of changing the base funciton i think

[sail, 2012/09/10 21:58:43]

Unless you feel strongly about this I'd prefer to add NULL checks in the base/*
functions. I find it's much easier to read.

+
+  CFURLRef url = base::mac::GetValueFromDictionary<CFURLRef>(
+      dict, kDADiskDescriptionVolumePathKey);
+  NSURL* nsurl = base::mac::CFToNSCast(url);
+  info.mount_point_ = base::mac::NSStringToFilePath([nsurl path]);
+
+  string16 vendor_name = GetUTF16FromDictionary(
+      dict, kDADiskDescriptionDeviceVendorKey);
+  string16 model_name = GetUTF16FromDictionary(
+      dict, kDADiskDescriptionDeviceModelKey);
+  string16 volume_name = GetUTF16FromDictionary(
+      dict, kDADiskDescriptionVolumeNameKey);
+  info.display_name_ = vendor_name;
+  info.display_name_ = JoinName(info.display_name_, model_name);
+  info.display_name_ = JoinName(info.display_name_, volume_name);
+
+  CFUUIDRef uuid = base::mac::GetValueFromDictionary<CFUUIDRef>(
+      dict, kDADiskDescriptionVolumeUUIDKey);
+  std::string unique_id;
+  if (uuid) {
+    base::mac::ScopedCFTypeRef<CFStringRef> uuid_string(
+        CFUUIDCreateString(NULL, uuid));
+    unique_id = base::SysCFStringRefToUTF8(uuid_string);
+  }
+  if (unique_id.empty())
+    unique_id = info.bsd_name_;

[vandebo (ex-Chrome), 2012/09/10 18:45:03]

This is ok for non-removable devices, but not for removable ones.  Later down in
the pipeline we store the unique id (as part of the device id) in preferences so
that when that device arrives again, maybe after a restart of Chrome, we can
associate it with the previous instance.

[sail, 2012/09/10 21:58:43]

Unfortunately I couldn't find a better solution. Most devices I tried connecting
to my Mac didn't provide a UUID.

Here's the output from 3 devices that I tried:
http://pastebin.com/pHJ7DWdw
http://pastebin.com/8udVaTkf
http://pastebin.com/qAssj9Xu

[vandebo (ex-Chrome), 2012/09/10 22:53:05]

Fair, though bsd_name isn't helpful....

The Disk Manager utility does display an id for FAT devices (USB Serial Number,
or something like that) on the device, not the partition entry.  But this
thread: http://lists.apple.com/archives/filesystem-dev/2012/Feb/msg00009.html
suggests that there's no standardized way to get that.

On Linux we fall back to a combination of DADeviceVendor DADeviceModel
DADeviceRevision DADeviceUnit(?)

[sail, 2012/09/11 00:14:06]

Done. Changed to use "vendor model revision unit" as a fallback device id.

+
+  CFBooleanRef is_removable_ref =
+      base::mac::GetValueFromDictionary<CFBooleanRef>(
+          dict, kDADiskDescriptionMediaRemovableKey);
+  bool is_removable = is_removable_ref && CFBooleanGetValue(is_removable_ref);
+  bool has_dcim = IsMediaDevice(info.mount_point_.value());
+  info.type_ = GetDeviceType(is_removable, has_dcim);
+  info.device_id_ = MediaStorageUtil::MakeDeviceId(info.type_, unique_id);
+
+  return info;
+}
+
+}  // chrome