Rewrite apps::SavedDevicesService as extensions::DevicePermissionsManager.

extensions/browser/api/device_permissions_manager.cc

Index: extensions/browser/api/device_permissions_manager.cc
diff --git a/extensions/browser/api/device_permissions_manager.cc b/extensions/browser/api/device_permissions_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a005adbbc4b18c57d7c8dfa7217711242113b6d9
--- /dev/null
+++ b/extensions/browser/api/device_permissions_manager.cc
@@ -0,0 +1,384 @@
+// 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 "extensions/browser/api/device_permissions_manager.h"
+
+#include "base/memory/singleton.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "content/public/browser/notification_service.h"
+#include "device/usb/usb_ids.h"
+#include "extensions/browser/extension_host.h"
+#include "extensions/browser/extension_prefs.h"
+#include "extensions/browser/notification_types.h"
+#include "extensions/strings/grit/extensions_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace extensions {
+
+using content::BrowserContext;
+using device::UsbDevice;
+using extensions::APIPermission;
+using extensions::Extension;
+using extensions::ExtensionHost;
+using extensions::ExtensionPrefs;
+
+namespace {
+
+// Preference keys
+
+// The device that the app has permission to access.
+const char kDevices[] = "devices";
+
+// The type of device saved.
+const char kDeviceType[] = "type";
+
+// Type identifier for USB devices.
+const char kDeviceTypeUsb[] = "usb";
+
+// The vendor ID of the device that the app had permission to access.
+const char kDeviceVendorId[] = "vendor_id";
+
+// The product ID of the device that the app had permission to access.
+const char kDeviceProductId[] = "product_id";
+
+// The serial number of the device that the app has permission to access.
+const char kDeviceSerialNumber[] = "serial_number";
+
+// Persists a DevicePermissionEntry in ExtensionPrefs.
+void SaveDevicePermissionEntry(BrowserContext* context,
+                               const std::string& extension_id,
+                               const DevicePermissionEntry& device) {
+  ExtensionPrefs* prefs = ExtensionPrefs::Get(context);
+  ExtensionPrefs::ScopedListUpdate update(prefs, extension_id, kDevices);
+  base::ListValue* devices = update.Get();
+  if (!devices) {
+    devices = update.Create();
+  }
+
+  base::Value* device_entry = device.ToValue();
+  DCHECK(devices->Find(*device_entry) == devices->end());
+  devices->Append(device_entry);
+}
+
+// Clears all DevicePermissionEntries for the app from ExtensionPrefs.
+void ClearDevicePermissionEntries(ExtensionPrefs* prefs,
+                                  const std::string& extension_id) {
+  prefs->UpdateExtensionPref(extension_id, kDevices, NULL);
+}
+
+// Returns all DevicePermissionEntries for the app.
+std::vector<DevicePermissionEntry> GetDevicePermissionEntries(
+    ExtensionPrefs* prefs,
+    const std::string& extension_id) {
+  std::vector<DevicePermissionEntry> result;
+  const base::ListValue* devices = NULL;
+  if (!prefs->ReadPrefAsList(extension_id, kDevices, &devices)) {
+    return result;
+  }
+
+  for (base::ListValue::const_iterator it = devices->begin();
+       it != devices->end();
+       ++it) {
+    const base::DictionaryValue* device_entry = NULL;
+    if (!(*it)->GetAsDictionary(&device_entry)) {
+      continue;
+    }
+    int vendor_id;
+    if (!device_entry->GetIntegerWithoutPathExpansion(kDeviceVendorId,
+                                                      &vendor_id) ||
+        vendor_id < 0 || vendor_id > UINT16_MAX) {
+      continue;
+    }
+    int product_id;
+    if (!device_entry->GetIntegerWithoutPathExpansion(kDeviceProductId,
+                                                      &product_id) ||
+        product_id < 0 || product_id > UINT16_MAX) {
+      continue;
+    }
+    base::string16 serial_number;
+    if (!device_entry->GetStringWithoutPathExpansion(kDeviceSerialNumber,
+                                                     &serial_number)) {
+      continue;
+    }
+
+    result.push_back(
+        DevicePermissionEntry(vendor_id, product_id, serial_number));
+  }
+  return result;
+}
+}
+
+DevicePermissionEntry::DevicePermissionEntry(
+    uint16_t vendor_id,
+    uint16_t product_id,
+    const base::string16& serial_number)
+    : vendor_id(vendor_id),
+      product_id(product_id),
+      serial_number(serial_number) {
+}
+
+base::Value* DevicePermissionEntry::ToValue() const {
+  base::DictionaryValue* device_entry_dict = new base::DictionaryValue();
+  device_entry_dict->SetStringWithoutPathExpansion(kDeviceType, kDeviceTypeUsb);
+  device_entry_dict->SetIntegerWithoutPathExpansion(kDeviceVendorId, vendor_id);
+  device_entry_dict->SetIntegerWithoutPathExpansion(kDeviceProductId,
+                                                    product_id);
+  device_entry_dict->SetStringWithoutPathExpansion(kDeviceSerialNumber,
+                                                   serial_number);
+  return device_entry_dict;
+}
+
+DevicePermissions::~DevicePermissions() {
+}
+
+bool DevicePermissions::CheckUsbDevice(
+    scoped_refptr<device::UsbDevice> device) const {
+  if (ephemeral_devices_.find(device) != ephemeral_devices_.end()) {
+    return true;
+  }
+
+  bool have_serial_number = false;
+  base::string16 serial_number;
+  for (const auto& entry : permission_entries_) {
+    if (entry.vendor_id != device->vendor_id()) {
+      continue;
+    }
+    if (entry.product_id != device->product_id()) {
+      continue;
+    }
+    if (!have_serial_number) {
+      if (!device->GetSerialNumber(&serial_number)) {
+        break;
+      }
+      have_serial_number = true;
+    }
+    if (entry.serial_number != serial_number) {
+      continue;
+    }
+    return true;
+  }
+  return false;
+}
+
+DevicePermissions::DevicePermissions(BrowserContext* context,
+                                     const std::string& extension_id) {
+  ExtensionPrefs* prefs = ExtensionPrefs::Get(context);
+  permission_entries_ = GetDevicePermissionEntries(prefs, extension_id);
+}
+
+DevicePermissions::DevicePermissions(
+    const std::vector<DevicePermissionEntry>& permission_entries,
+    const std::set<scoped_refptr<device::UsbDevice>>& ephemeral_devices)
+    : permission_entries_(permission_entries),
+      ephemeral_devices_(ephemeral_devices) {
+}
+
+std::vector<DevicePermissionEntry>& DevicePermissions::permission_entries() {
+  return permission_entries_;
+}
+
+std::set<scoped_refptr<device::UsbDevice>>&
+DevicePermissions::ephemeral_devices() {
+  return ephemeral_devices_;
+}
+
+// static
+DevicePermissionsManager* DevicePermissionsManager::Get(
+    BrowserContext* context) {
+  return DevicePermissionsManagerFactory::GetForBrowserContext(context);
+}
+
+scoped_ptr<DevicePermissions> DevicePermissionsManager::GetForExtension(
+    const std::string& extension_id) {
+  DCHECK(CalledOnValidThread());
+
+  DevicePermissions* device_permissions = GetOrInsert(extension_id);
+  return make_scoped_ptr(
+      new DevicePermissions(device_permissions->permission_entries(),
+                            device_permissions->ephemeral_devices()));
+}
+
+std::vector<base::string16>
+DevicePermissionsManager::GetPermissionMessageStrings(
+    const std::string& extension_id) {
+  DCHECK(CalledOnValidThread());
+
+  std::vector<base::string16> messages;
+  DevicePermissions* device_permissions = Get(extension_id);
+  if (!device_permissions) {
+    return messages;
+  }
+
+  for (const auto& entry : device_permissions->permission_entries()) {
+    const char* vendorName = device::UsbIds::GetVendorName(entry.vendor_id);
+    const char* productName =
+        device::UsbIds::GetProductName(entry.vendor_id, entry.product_id);
+    if (vendorName) {
+      if (productName) {
+        messages.push_back(l10n_util::GetStringFUTF16(
+            IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_SERIAL,
+            base::UTF8ToUTF16(vendorName),
+            base::UTF8ToUTF16(productName),
+            entry.serial_number));
+      } else {
+        messages.push_back(l10n_util::GetStringFUTF16(
+            IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_PID_SERIAL,
+            base::UTF8ToUTF16(vendorName),
+            base::ASCIIToUTF16(base::StringPrintf("0x%04X", entry.product_id)),
+            entry.serial_number));
+      }
+    } else {
+      messages.push_back(l10n_util::GetStringFUTF16(
+          IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_VID_PID_SERIAL,
+          base::ASCIIToUTF16(base::StringPrintf("0x%04X", entry.vendor_id)),
+          base::ASCIIToUTF16(base::StringPrintf("0x%04X", entry.product_id)),
+          entry.serial_number));
+    }
+  }
+  return messages;
+}
+
+void DevicePermissionsManager::AllowUsbDevice(
+    const std::string& extension_id,
+    scoped_refptr<device::UsbDevice> device,
+    const base::string16& serial_number) {
+  DCHECK(CalledOnValidThread());
+  DevicePermissions* device_permissions = GetOrInsert(extension_id);
+
+  if (!serial_number.empty()) {
+    for (const auto& entry : device_permissions->permission_entries()) {
+      if (entry.vendor_id != device->vendor_id()) {
+        continue;
+      }
+      if (entry.product_id != device->product_id()) {
+        continue;
+      }
+      if (entry.serial_number == serial_number) {
+        return;
+      }
+    }
+
+    DevicePermissionEntry device_entry = DevicePermissionEntry(
+        device->vendor_id(), device->product_id(), serial_number);
+    device_permissions->permission_entries().push_back(device_entry);
+    SaveDevicePermissionEntry(context_, extension_id, device_entry);
+  } else {
+    // Without a serial number a device cannot be reliably identified when it
+    // is reconnected so such devices are only remembered until disconnect.
+    // Register an observer here so that this set doesn't grow undefinitely.
+    device_permissions->ephemeral_devices().insert(device);
+    device->AddObserver(this);
+  }
+}
+
+void DevicePermissionsManager::Clear(const std::string& extension_id) {
+  DCHECK(CalledOnValidThread());
+
+  ClearDevicePermissionEntries(ExtensionPrefs::Get(context_), extension_id);
+  std::map<std::string, DevicePermissions*>::iterator it =
+      extension_id_to_device_permissions_.find(extension_id);
+  if (it != extension_id_to_device_permissions_.end()) {
+    delete it->second;
+    extension_id_to_device_permissions_.erase(it);
+  }
+}
+
+DevicePermissionsManager::DevicePermissionsManager(
+    content::BrowserContext* context)
+    : context_(context) {
+  registrar_.Add(this,
+                 extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED,
+                 content::NotificationService::AllSources());
+}
+
+DevicePermissionsManager::~DevicePermissionsManager() {
+  for (const auto& map_entry : extension_id_to_device_permissions_) {
+    delete map_entry.second;
+  }
+}
+
+DevicePermissions* DevicePermissionsManager::Get(
+    const std::string& extension_id) const {
+  std::map<std::string, DevicePermissions*>::const_iterator it =
+      extension_id_to_device_permissions_.find(extension_id);
+  if (it != extension_id_to_device_permissions_.end()) {
+    return it->second;
+  }
+
+  return NULL;
+}
+
+DevicePermissions* DevicePermissionsManager::GetOrInsert(
+    const std::string& extension_id) {
+  DevicePermissions* device_permissions = Get(extension_id);
+  if (!device_permissions) {
+    device_permissions = new DevicePermissions(context_, extension_id);
+    extension_id_to_device_permissions_[extension_id] = device_permissions;
+  }
+
+  return device_permissions;
+}
+
+void DevicePermissionsManager::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK(CalledOnValidThread());
+  DCHECK_EQ(extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED, type);
+
+  ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
+  DevicePermissions* device_permissions = Get(host->extension_id());
+  if (device_permissions) {
+    // When the extension is unloaded all ephemeral device permissions are
+    // cleared.
+    for (std::set<scoped_refptr<UsbDevice>>::iterator it =
+             device_permissions->ephemeral_devices().begin();
+         it != device_permissions->ephemeral_devices().end();
+         ++it) {
+      (*it)->RemoveObserver(this);
+    }
+    device_permissions->ephemeral_devices().clear();
+  }
+}
+
+void DevicePermissionsManager::OnDisconnect(scoped_refptr<UsbDevice> device) {
+  for (const auto& map_entry : extension_id_to_device_permissions_) {
+    // An ephemeral device cannot be identified if it is reconnected and so
+    // permission to access it is cleared on disconnect.
+    map_entry.second->ephemeral_devices().erase(device);
+    device->RemoveObserver(this);
+  }
+}
+
+// static
+DevicePermissionsManager* DevicePermissionsManagerFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<DevicePermissionsManager*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+// static
+DevicePermissionsManagerFactory*
+DevicePermissionsManagerFactory::GetInstance() {
+  return Singleton<DevicePermissionsManagerFactory>::get();
+}
+
+DevicePermissionsManagerFactory::DevicePermissionsManagerFactory()
+    : BrowserContextKeyedServiceFactory(
+          "DevicePermissionsManager",
+          BrowserContextDependencyManager::GetInstance()) {
+}
+
+DevicePermissionsManagerFactory::~DevicePermissionsManagerFactory() {
+}
+
+KeyedService* DevicePermissionsManagerFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new DevicePermissionsManager(context);
+}
+
+}  // namespace extensions