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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/media/webrtc/desktop_capture_access_handler.h"
#include <memory>
#include <string>
#include "base/command_line.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "chrome/browser/media/webrtc/desktop_capture_devices_util.h"
#include "chrome/browser/media/webrtc/media_capture_devices_dispatcher.h"
#include "chrome/browser/media/webrtc/media_stream_capture_indicator.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/screen_capture_notification_ui.h"
#include "chrome/browser/ui/simple_message_box.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/grit/generated_resources.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/desktop_streams_registry.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/media_stream_request.h"
#include "content/public/common/origin_util.h"
#include "extensions/browser/app_window/app_window.h"
#include "extensions/browser/app_window/app_window_registry.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/switches.h"
#include "net/base/url_util.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_capture_types.h"
#include "ui/base/l10n/l10n_util.h"
#if defined(OS_CHROMEOS)
#include "ash/shell.h"
#include "ui/base/ui_base_features.h"
#endif // defined(OS_CHROMEOS)
using content::BrowserThread;
namespace {
// Helper to get title of the calling application shown in the screen capture
// notification.
base::string16 GetApplicationTitle(content::WebContents* web_contents,
const extensions::Extension* extension) {
// Use extension name as title for extensions and host/origin for drive-by
// web.
std::string title;
if (extension) {
title = extension->name();
return base::UTF8ToUTF16(title);
}
GURL url = web_contents->GetURL();
title = content::IsOriginSecure(url) ? net::GetHostAndOptionalPort(url)
: url.GetOrigin().spec();
return base::UTF8ToUTF16(title);
}
// Returns whether an on-screen notification should appear after desktop capture
// is approved for |extension|. Component extensions do not display a
// notification.
bool ShouldDisplayNotification(const extensions::Extension* extension) {
return !(extension &&
(extension->location() == extensions::Manifest::COMPONENT ||
extension->location() == extensions::Manifest::EXTERNAL_COMPONENT));
}
#if !defined(OS_ANDROID)
// Find browser or app window from a given |web_contents|.
gfx::NativeWindow FindParentWindowForWebContents(
content::WebContents* web_contents) {
Browser* browser = chrome::FindBrowserWithWebContents(web_contents);
if (browser && browser->window())
return browser->window()->GetNativeWindow();
const extensions::AppWindowRegistry::AppWindowList& window_list =
extensions::AppWindowRegistry::Get(web_contents->GetBrowserContext())
->app_windows();
for (extensions::AppWindowRegistry::AppWindowList::const_iterator iter =
window_list.begin();
iter != window_list.end(); ++iter) {
if ((*iter)->web_contents() == web_contents)
return (*iter)->GetNativeWindow();
}
return NULL;
}
#endif
} // namespace
DesktopCaptureAccessHandler::DesktopCaptureAccessHandler() {
}
DesktopCaptureAccessHandler::~DesktopCaptureAccessHandler() {
}
void DesktopCaptureAccessHandler::ProcessScreenCaptureAccessRequest(
content::WebContents* web_contents,
const content::MediaStreamRequest& request,
content::MediaResponseCallback callback,
const extensions::Extension* extension) {
content::MediaStreamDevices devices;
std::unique_ptr<content::MediaStreamUI> ui;
DCHECK_EQ(request.video_type, content::MEDIA_GUM_DESKTOP_VIDEO_CAPTURE);
UpdateExtensionTrusted(request, extension);
bool loopback_audio_supported = false;
#if defined(USE_CRAS) || defined(OS_WIN)
// Currently loopback audio capture is supported only on Windows and ChromeOS.
loopback_audio_supported = true;
#endif
bool screen_capture_enabled =
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableUserMediaScreenCapturing) ||
MediaCaptureDevicesDispatcher::IsOriginForCasting(
request.security_origin) ||
IsExtensionWhitelistedForScreenCapture(extension) ||
IsBuiltInExtension(request.security_origin);
const bool origin_is_secure =
content::IsOriginSecure(request.security_origin) ||
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAllowHttpScreenCapture);
// If basic conditions (screen capturing is enabled and origin is secure)
// aren't fulfilled, we'll use "invalid state" as result. Otherwise, we set
// it after checking permission.
// TODO(grunell): It would be good to change this result for something else,
// probably a new one.
content::MediaStreamRequestResult result =
content::MEDIA_DEVICE_INVALID_STATE;
#if defined(OS_CHROMEOS)
if (!features::IsAshInBrowserProcess()) {
// TODO(crbug.com/806366): Screen capture support for mash.
NOTIMPLEMENTED() << "Screen capture not yet implemented in --mash";
screen_capture_enabled = false;
result = content::MEDIA_DEVICE_NOT_SUPPORTED;
}
#endif // defined(OS_CHROMEOS)
// Approve request only when the following conditions are met:
// 1. Screen capturing is enabled via command line switch or white-listed for
// the given origin.
// 2. Request comes from a page with a secure origin or from an extension.
if (screen_capture_enabled && origin_is_secure) {
// Get title of the calling application prior to showing the message box.
// chrome::ShowQuestionMessageBox() starts a nested run loop which may
// allow |web_contents| to be destroyed on the UI thread before the messag
// box is closed. See http://crbug.com/326690.
base::string16 application_title =
GetApplicationTitle(web_contents, extension);
#if !defined(OS_ANDROID)
gfx::NativeWindow parent_window =
FindParentWindowForWebContents(web_contents);
#else
gfx::NativeWindow parent_window = NULL;
#endif
web_contents = NULL;
// Some extensions do not require user approval, because they provide their
// own user approval UI.
bool is_approved = IsDefaultApproved(extension);
if (!is_approved) {
base::string16 application_name =
base::UTF8ToUTF16(request.security_origin.spec());
if (extension)
application_name = base::UTF8ToUTF16(extension->name());
base::string16 confirmation_text = l10n_util::GetStringFUTF16(
request.audio_type == content::MEDIA_NO_SERVICE
? IDS_MEDIA_SCREEN_CAPTURE_CONFIRMATION_TEXT
: IDS_MEDIA_SCREEN_AND_AUDIO_CAPTURE_CONFIRMATION_TEXT,
application_name);
chrome::MessageBoxResult result = chrome::ShowQuestionMessageBox(
parent_window,
l10n_util::GetStringFUTF16(
IDS_MEDIA_SCREEN_CAPTURE_CONFIRMATION_TITLE, application_name),
confirmation_text);
is_approved = (result == chrome::MESSAGE_BOX_RESULT_YES);
}
if (is_approved) {
content::DesktopMediaID screen_id;
#if defined(OS_CHROMEOS)
screen_id = content::DesktopMediaID::RegisterAuraWindow(
content::DesktopMediaID::TYPE_SCREEN,
ash::Shell::Get()->GetPrimaryRootWindow());
#else // defined(OS_CHROMEOS)
screen_id = content::DesktopMediaID(content::DesktopMediaID::TYPE_SCREEN,
webrtc::kFullDesktopScreenId);
#endif // !defined(OS_CHROMEOS)
bool capture_audio =
(request.audio_type == content::MEDIA_GUM_DESKTOP_AUDIO_CAPTURE &&
loopback_audio_supported);
// Determine if the extension is required to display a notification.
const bool display_notification = ShouldDisplayNotification(extension);
ui = GetDevicesForDesktopCapture(
web_contents, &devices, screen_id,
content::MEDIA_GUM_DESKTOP_VIDEO_CAPTURE,
content::MEDIA_GUM_DESKTOP_AUDIO_CAPTURE, capture_audio,
request.disable_local_echo, display_notification, application_title,
application_title);
DCHECK(!devices.empty());
}
// The only case when devices can be empty is if the user has denied
// permission.
result = devices.empty() ? content::MEDIA_DEVICE_PERMISSION_DENIED
: content::MEDIA_DEVICE_OK;
}
std::move(callback).Run(devices, result, std::move(ui));
}
bool DesktopCaptureAccessHandler::IsDefaultApproved(
const extensions::Extension* extension) {
return extension &&
(extension->location() == extensions::Manifest::COMPONENT ||
extension->location() == extensions::Manifest::EXTERNAL_COMPONENT ||
IsExtensionWhitelistedForScreenCapture(extension));
}
bool DesktopCaptureAccessHandler::SupportsStreamType(
content::WebContents* web_contents,
const content::MediaStreamType type,
const extensions::Extension* extension) {
return type == content::MEDIA_GUM_DESKTOP_VIDEO_CAPTURE ||
type == content::MEDIA_GUM_DESKTOP_AUDIO_CAPTURE;
}
bool DesktopCaptureAccessHandler::CheckMediaAccessPermission(
content::RenderFrameHost* render_frame_host,
const GURL& security_origin,
content::MediaStreamType type,
const extensions::Extension* extension) {
return false;
}
void DesktopCaptureAccessHandler::HandleRequest(
content::WebContents* web_contents,
const content::MediaStreamRequest& request,
content::MediaResponseCallback callback,
const extensions::Extension* extension) {
content::MediaStreamDevices devices;
std::unique_ptr<content::MediaStreamUI> ui;
if (request.video_type != content::MEDIA_GUM_DESKTOP_VIDEO_CAPTURE) {
std::move(callback).Run(devices, content::MEDIA_DEVICE_INVALID_STATE,
std::move(ui));
return;
}
// If the device id wasn't specified then this is a screen capture request
// (i.e. chooseDesktopMedia() API wasn't used to generate device id).
if (request.requested_video_device_id.empty()) {
ProcessScreenCaptureAccessRequest(web_contents, request,
std::move(callback), extension);
return;
}
// The extension name that the stream is registered with.
std::string original_extension_name;
// Resolve DesktopMediaID for the specified device id.
content::DesktopMediaID media_id;
// TODO(miu): Replace "main RenderFrame" IDs with the request's actual
// RenderFrame IDs once the desktop capture extension API implementation is
// fixed. http://crbug.com/304341
content::WebContents* const web_contents_for_stream =
content::WebContents::FromRenderFrameHost(
content::RenderFrameHost::FromID(request.render_process_id,
request.render_frame_id));
content::RenderFrameHost* const main_frame =
web_contents_for_stream ? web_contents_for_stream->GetMainFrame() : NULL;
if (main_frame) {
media_id =
content::DesktopStreamsRegistry::GetInstance()->RequestMediaForStreamId(
request.requested_video_device_id,
main_frame->GetProcess()->GetID(), main_frame->GetRoutingID(),
request.security_origin, &original_extension_name,
content::kRegistryStreamTypeDesktop);
}
// Received invalid device id.
if (media_id.type == content::DesktopMediaID::TYPE_NONE) {
std::move(callback).Run(devices, content::MEDIA_DEVICE_INVALID_STATE,
std::move(ui));
return;
}
bool loopback_audio_supported = false;
#if defined(USE_CRAS) || defined(OS_WIN)
// Currently loopback audio capture is supported only on Windows and ChromeOS.
loopback_audio_supported = true;
#endif
// This value essentially from the checkbox on picker window, so it
// corresponds to user permission.
const bool audio_permitted = media_id.audio_share;
// This value essentially from whether getUserMedia requests audio stream.
const bool audio_requested =
request.audio_type == content::MEDIA_GUM_DESKTOP_AUDIO_CAPTURE;
// This value shows for a given capture type, whether the system or our code
// can support audio sharing. Currently audio is only supported for screen and
// tab/webcontents capture streams.
const bool audio_supported =
(media_id.type == content::DesktopMediaID::TYPE_SCREEN &&
loopback_audio_supported) ||
media_id.type == content::DesktopMediaID::TYPE_WEB_CONTENTS;
const bool check_audio_permission =
!base::CommandLine::ForCurrentProcess()->HasSwitch(
extensions::switches::kDisableDesktopCaptureAudio);
const bool capture_audio =
(check_audio_permission ? audio_permitted : true) && audio_requested &&
audio_supported;
// Determine if the extension is required to display a notification.
const bool display_notification = ShouldDisplayNotification(extension);
ui = GetDevicesForDesktopCapture(web_contents, &devices, media_id,
content::MEDIA_GUM_DESKTOP_VIDEO_CAPTURE,
content::MEDIA_GUM_DESKTOP_AUDIO_CAPTURE,
capture_audio, request.disable_local_echo,
display_notification,
GetApplicationTitle(web_contents, extension),
base::UTF8ToUTF16(original_extension_name));
UpdateExtensionTrusted(request, extension);
std::move(callback).Run(devices, content::MEDIA_DEVICE_OK, std::move(ui));
}