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// 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 "chrome/browser/usb/web_usb_permission_provider.h"
#include <stddef.h>
#include <utility>
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/usb/usb_chooser_context.h"
#include "chrome/browser/usb/usb_chooser_context_factory.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "device/core/device_client.h"
using content::WebContents;
using device::usb::WebUsbDescriptorSet;
using device::usb::WebUsbConfigurationSubsetPtr;
using device::usb::WebUsbFunctionSubsetPtr;
namespace {
bool FindOriginInDescriptorSet(const WebUsbDescriptorSet* set,
const GURL& origin,
const uint8_t* configuration_value,
const uint8_t* interface_number) {
if (!set)
return false;
for (size_t i = 0; i < set->origins.size(); ++i) {
if (origin.spec() == set->origins[i])
return true;
}
for (size_t i = 0; i < set->configurations.size(); ++i) {
const device::usb::WebUsbConfigurationSubsetPtr& config =
set->configurations[i];
if (configuration_value &&
*configuration_value != config->configuration_value)
continue;
for (size_t j = 0; i < config->origins.size(); ++j) {
if (origin.spec() == config->origins[j])
return true;
}
for (size_t j = 0; j < config->functions.size(); ++j) {
const device::usb::WebUsbFunctionSubsetPtr& function =
config->functions[j];
// TODO(reillyg): Implement support for Interface Association Descriptors
// so that this check will match associated interfaces.
if (interface_number && *interface_number != function->first_interface)
continue;
for (size_t k = 0; k < function->origins.size(); ++k) {
if (origin.spec() == function->origins[k])
return true;
}
}
}
return false;
}
} // namespace
WebUSBPermissionProvider::WebUSBPermissionProvider(
content::RenderFrameHost* render_frame_host)
: render_frame_host_(render_frame_host) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(render_frame_host_);
}
WebUSBPermissionProvider::~WebUSBPermissionProvider() {}
void WebUSBPermissionProvider::HasDevicePermission(
mojo::Array<device::usb::DeviceInfoPtr> requested_devices,
const HasDevicePermissionCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
WebContents* web_contents =
WebContents::FromRenderFrameHost(render_frame_host_);
GURL embedding_origin =
web_contents->GetMainFrame()->GetLastCommittedURL().GetOrigin();
GURL requesting_origin =
render_frame_host_->GetLastCommittedURL().GetOrigin();
Profile* profile =
Profile::FromBrowserContext(web_contents->GetBrowserContext());
UsbChooserContext* chooser_context =
UsbChooserContextFactory::GetForProfile(profile);
mojo::Array<mojo::String> allowed_guids;
for (size_t i = 0; i < requested_devices.size(); ++i) {
const device::usb::DeviceInfo& device = *requested_devices[i];
if (FindOriginInDescriptorSet(device.webusb_allowed_origins.get(),
requesting_origin, nullptr, nullptr) &&
chooser_context->HasDevicePermission(requesting_origin,
embedding_origin, device)) {
allowed_guids.push_back(device.guid);
}
}
callback.Run(std::move(allowed_guids));
}
void WebUSBPermissionProvider::HasConfigurationPermission(
uint8_t requested_configuration_value,
device::usb::DeviceInfoPtr device,
const HasInterfacePermissionCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
callback.Run(FindOriginInDescriptorSet(
device->webusb_allowed_origins.get(),
render_frame_host_->GetLastCommittedURL().GetOrigin(),
&requested_configuration_value, nullptr));
}
void WebUSBPermissionProvider::HasInterfacePermission(
uint8_t requested_interface,
uint8_t configuration_value,
device::usb::DeviceInfoPtr device,
const HasInterfacePermissionCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
callback.Run(FindOriginInDescriptorSet(
device->webusb_allowed_origins.get(),
render_frame_host_->GetLastCommittedURL().GetOrigin(),
&configuration_value, &requested_interface));
}
void WebUSBPermissionProvider::Bind(
mojo::InterfaceRequest<device::usb::PermissionProvider> request) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
bindings_.AddBinding(this, std::move(request));
}
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