Support permission_broker for chrome.hid devices.

device/hid/hid_service_linux.cc

 // Copyright 2014 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 "device/hid/hid_service_linux.h"
 
 #include <linux/hidraw.h>
 #include <sys/ioctl.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "device/hid/hid_connection_linux.h"
 #include "device/hid/hid_device_info.h"
 #include "device/hid/hid_report_descriptor.h"
 #include "device/udev_linux/udev.h"
 
+#if defined(OS_CHROMEOS)
+#include "base/sys_info.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/permission_broker_client.h"
+#endif  // defined(OS_CHROMEOS)
+
 namespace device {
 
 namespace {
 
 const char kHidrawSubsystem[] = "hidraw";
 const char kHIDID[] = "HID_ID";
 const char kHIDName[] = "HID_NAME";
 const char kHIDUnique[] = "HID_UNIQ";
 
 }  // namespace
 
-HidServiceLinux::HidServiceLinux() {
+HidServiceLinux::HidServiceLinux(
+    scoped_refptr<base::MessageLoopProxy> ui_message_loop)
+    : ui_message_loop_(ui_message_loop),
+      weak_factory_(this) {
   DeviceMonitorLinux* monitor = DeviceMonitorLinux::GetInstance();
   monitor->AddObserver(this);
   monitor->Enumerate(
-      base::Bind(&HidServiceLinux::OnDeviceAdded, base::Unretained(this)));
+      base::Bind(&HidServiceLinux::OnDeviceAdded, weak_factory_.GetWeakPtr()));
 }
 
 scoped_refptr<HidConnection> HidServiceLinux::Connect(
     const HidDeviceId& device_id) {
   HidDeviceInfo device_info;
   if (!GetDeviceInfo(device_id, &device_info))
     return NULL;
 
   ScopedUdevDevicePtr device =
       DeviceMonitorLinux::GetInstance()->GetDeviceFromPath(
@@ skipping 16 matching lines @@
   if (!device)
     return;
 
   const char* device_path = udev_device_get_syspath(device);
   if (!device_path)
     return;
   const char* subsystem = udev_device_get_subsystem(device);
   if (!subsystem || strcmp(subsystem, kHidrawSubsystem) != 0)
     return;
 
-  HidDeviceInfo device_info;
-  device_info.device_id = device_path;
+  scoped_ptr<HidDeviceInfo> device_info(new HidDeviceInfo);
+  device_info->device_id = device_path;
 
   uint32_t int_property = 0;
   const char* str_property = NULL;
 
   udev_device *parent = udev_device_get_parent(device);
   if (!parent) {
     return;
   }
 
   const char* hid_id = udev_device_get_property_value(parent, kHIDID);
   if (!hid_id)
     return;
 
   std::vector<std::string> parts;
   base::SplitString(hid_id, ':', &parts);
   if (parts.size() != 3) {
     return;
   }
 
   if (HexStringToUInt(base::StringPiece(parts[1]), &int_property)) {
-    device_info.vendor_id = int_property;
+    device_info->vendor_id = int_property;
   }
 
   if (HexStringToUInt(base::StringPiece(parts[2]), &int_property)) {
-    device_info.product_id = int_property;
+    device_info->product_id = int_property;
   }
 
   str_property = udev_device_get_property_value(parent, kHIDUnique);
   if (str_property != NULL)
-    device_info.serial_number = str_property;
+    device_info->serial_number = str_property;
 
   str_property = udev_device_get_property_value(parent, kHIDName);
   if (str_property != NULL)
-    device_info.product_name = str_property;
+    device_info->product_name = str_property;
 
   const std::string dev_node = udev_device_get_devnode(device);
+#if defined(OS_CHROMEOS)
+  // ChromeOS builds on non-ChromeOS machines (dev) should not attempt to
+  // use permission broker.
+  if (base::SysInfo::IsRunningOnChromeOS()) {
+    chromeos::PermissionBrokerClient* client =
+        chromeos::DBusThreadManager::Get()->GetPermissionBrokerClient();
+    DCHECK(client) << "Could not get permission broker client.";
+    if (!client) {
+      return;
+    }
+    ui_message_loop_->PostTask(
+        FROM_HERE,
+        base::Bind(&chromeos::PermissionBrokerClient::RequestPathAccess,
+                   base::Unretained(client),
+                   dev_node,
+                   -1,
+                   base::Bind(&HidServiceLinux::OnRequestAccessComplete,
+                              weak_factory_.GetWeakPtr(),
+                              dev_node,
+                              base::Passed(&device_info))));
+  } else {
+    OnRequestAccessComplete(dev_node, device_info.Pass(), true);
+  }
+#else
+  OnRequestAccessComplete(dev_node, device_info.Pass(), true);
+#endif  // defined(OS_CHROMEOS)
+}
+
+void HidServiceLinux::OnDeviceRemoved(udev_device* device) {
+  const char* device_path = udev_device_get_syspath(device);;
+  if (device_path)
+    RemoveDevice(device_path);
+}
+
+void HidServiceLinux::OnRequestAccessComplete(
+    const std::string& path,
+    scoped_ptr<HidDeviceInfo> device_info,
+    bool success) {
   const int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
-
-  base::File device_file(base::FilePath(dev_node), flags);
+  base::File device_file(base::FilePath(path), flags);
   if (!device_file.IsValid()) {
-    LOG(ERROR) << "Cannot open '" << dev_node << "': "
+    LOG(ERROR) << "Cannot open '" << path << "': "
         << base::File::ErrorToString(device_file.error_details());
     return;
   }
 
   int desc_size = 0;
   int res = ioctl(device_file.GetPlatformFile(), HIDIOCGRDESCSIZE, &desc_size);
   if (res < 0) {
     PLOG(ERROR) << "Failed to get report descriptor size";
     device_file.Close();
     return;
   }
 
   hidraw_report_descriptor rpt_desc;
   rpt_desc.size = desc_size;
 
   res = ioctl(device_file.GetPlatformFile(), HIDIOCGRDESC, &rpt_desc);
   if (res < 0) {
     PLOG(ERROR) << "Failed to get report descriptor";
     device_file.Close();
     return;
   }
 
   device_file.Close();
 
   HidReportDescriptor report_descriptor(rpt_desc.value, rpt_desc.size);
-  report_descriptor.GetDetails(&device_info.collections,
-                               &device_info.max_input_report_size,
-                               &device_info.max_output_report_size,
-                               &device_info.max_feature_report_size);
+  report_descriptor.GetDetails(&device_info->collections,
+                               &device_info->max_input_report_size,
+                               &device_info->max_output_report_size,
+                               &device_info->max_feature_report_size);
 
-  AddDevice(device_info);
-}
-
-void HidServiceLinux::OnDeviceRemoved(udev_device* device) {
-  const char* device_path = udev_device_get_syspath(device);;
-  if (device_path)
-    RemoveDevice(device_path);
+  AddDevice(*device_info);
 }
 
 }  // namespace device