Store USB device permissions in website settings.

chrome/browser/usb/usb_chooser_permission_context.cc

Index: chrome/browser/usb/usb_chooser_permission_context.cc
diff --git a/chrome/browser/usb/usb_chooser_permission_context.cc b/chrome/browser/usb/usb_chooser_permission_context.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a4931ff3d40ac2aaf365f12ade687a75398d4d42
--- /dev/null
+++ b/chrome/browser/usb/usb_chooser_permission_context.cc
@@ -0,0 +1,138 @@
+// Copyright 2015 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 "base/stl_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/usb/usb_chooser_permission_context.h"

[raymes, 2015/10/14 02:07:04]

nit: this should go first with a space separating it from the other includes

[Reilly Grant (use Gerrit), 2015/10/22 00:57:03]

Done.

+#include "device/core/device_client.h"
+#include "device/usb/usb_device.h"
+
+using device::UsbDevice;
+
+namespace {
+
+const char kDeviceNameKey[] = "name";
+const char kVendorIdKey[] = "vendor-id";
+const char kProductIdKey[] = "product-id";
+const char kSerialNumberKey[] = "serial-number";
+
+bool CanStorePersistentEntry(const scoped_refptr<const UsbDevice>& device) {
+  return !device->serial_number().empty();
+}
+
+const base::DictionaryValue* FindForDevice(
+    const ChooserPermissionContextBase::ObjectList& device_list,
+    const scoped_refptr<const UsbDevice>& device) {
+  const std::string utf8_serial_number =
+      base::UTF16ToUTF8(device->serial_number());
+
+  for (const base::DictionaryValue* device_dict : device_list) {
+    int vendor_id;
+    int product_id;
+    std::string serial_number;
+    if (device_dict->GetInteger(kVendorIdKey, &vendor_id) &&
+        device->vendor_id() == vendor_id &&
+        device_dict->GetInteger(kProductIdKey, &product_id) &&
+        device->product_id() == product_id &&
+        device_dict->GetString(kSerialNumberKey, &serial_number) &&
+        utf8_serial_number == serial_number)

[raymes, 2015/10/14 02:07:04]

nit: {} for multiline if

[Reilly Grant (use Gerrit), 2015/10/22 00:57:02]

Done.

+      return device_dict;
+  }
+  return nullptr;
+}
+
+}  // namespace
+
+UsbChooserPermissionContext::UsbChooserPermissionContext(Profile* profile)
+    : ChooserPermissionContextBase(profile,
+                                   CONTENT_SETTINGS_TYPE_USB,
+                                   CONTENT_SETTINGS_TYPE_USB_CHOOSER_DATA),
+      observer_(this) {
+  usb_service_ = device::DeviceClient::Get()->GetUsbService();
+  if (usb_service_)
+    observer_.Add(usb_service_);
+}
+
+UsbChooserPermissionContext::~UsbChooserPermissionContext() {}
+
+void UsbChooserPermissionContext::GrantDevicePermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const std::string& guid) {
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return;
+
+  if (CanStorePersistentEntry(device)) {
+    scoped_ptr<base::DictionaryValue> device_dict(new base::DictionaryValue());
+    device_dict->SetString(kDeviceNameKey, device->product_string());
+    device_dict->SetInteger(kVendorIdKey, device->vendor_id());
+    device_dict->SetInteger(kProductIdKey, device->product_id());
+    device_dict->SetString(kSerialNumberKey, device->serial_number());
+    GrantObjectPermission(requesting_origin, embedding_origin,
+                          device_dict.Pass());
+  } else {
+    ephemeral_devices_[requesting_origin.GetOrigin()].insert(guid);
+  }
+}
+
+void UsbChooserPermissionContext::RevokeDevicePermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const std::string& guid) {
+  auto it = ephemeral_devices_.find(requesting_origin.GetOrigin());
+  if (it != ephemeral_devices_.end()) {
+    it->second.erase(guid);
+    if (it->second.empty())
+      ephemeral_devices_.erase(it);
+  }
+
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return;
+
+  ChooserPermissionContextBase::ObjectList device_list =
+      GetPreviouslyChosenObjects(requesting_origin, embedding_origin);
+  const base::DictionaryValue* entry = FindForDevice(device_list, device);
+  if (entry)
+    RevokeObjectPermission(requesting_origin, embedding_origin, *entry);
+}
+
+bool UsbChooserPermissionContext::HasDevicePermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const std::string& guid) {
+  auto it = ephemeral_devices_.find(requesting_origin.GetOrigin());
+  if (it != ephemeral_devices_.end())
+    return ContainsValue(it->second, guid);
+
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return false;
+
+  ChooserPermissionContextBase::ObjectList device_list =
+      GetPreviouslyChosenObjects(requesting_origin, embedding_origin);
+  return FindForDevice(device_list, device);

[raymes, 2015/10/14 02:07:04]

optional: != nullptr?

[Reilly Grant (use Gerrit), 2015/10/22 00:57:02]

Done.

+}
+
+bool UsbChooserPermissionContext::IsValidObject(
+    const base::DictionaryValue& object) {
+  return object.HasKey(kDeviceNameKey) && object.HasKey(kVendorIdKey) &&
+         object.HasKey(kProductIdKey) && object.HasKey(kSerialNumberKey);

[raymes, 2015/10/14 02:07:04]

I think we should probably also check that the number of keys == 4?

[Reilly Grant (use Gerrit), 2015/10/22 00:57:02]

Done.

+}
+
+std::string UsbChooserPermissionContext::GetStringToDisplayForObject(
+    const base::DictionaryValue& object) {
+  DCHECK(IsValidObject(object));
+  std::string name;
+  object.GetString(kDeviceNameKey, &name);
+  return name;
+}
+
+void UsbChooserPermissionContext::OnDeviceRemoved(
+    scoped_refptr<UsbDevice> device) {
+  for (auto& map_entry : ephemeral_devices_)
+    map_entry.second.erase(device->guid());
+}