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// Copyright (c) 2012 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/media_stream_devices_controller.h"
#include "base/command_line.h"
#include "base/prefs/pref_service.h"
#include "base/values.h"
#include "chrome/browser/content_settings/content_settings_provider.h"
#include "chrome/browser/content_settings/host_content_settings_map.h"
#include "chrome/browser/content_settings/tab_specific_content_settings.h"
#include "chrome/browser/media/media_capture_devices_dispatcher.h"
#include "chrome/browser/media/media_stream_capture_indicator.h"
#include "chrome/browser/prefs/scoped_user_pref_update.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/content_settings.h"
#include "chrome/common/content_settings_pattern.h"
#include "chrome/common/pref_names.h"
#include "components/user_prefs/pref_registry_syncable.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/media_stream_request.h"
#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/login/user_manager.h"
#endif
using content::BrowserThread;
namespace {
bool HasAnyAvailableDevice() {
const content::MediaStreamDevices& audio_devices =
MediaCaptureDevicesDispatcher::GetInstance()->GetAudioCaptureDevices();
const content::MediaStreamDevices& video_devices =
MediaCaptureDevicesDispatcher::GetInstance()->GetVideoCaptureDevices();
return !audio_devices.empty() || !video_devices.empty();
}
bool IsInKioskMode() {
if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kKioskMode))
return true;
#if defined(OS_CHROMEOS)
const chromeos::UserManager* user_manager = chromeos::UserManager::Get();
return user_manager && user_manager->IsLoggedInAsKioskApp();
#else
return false;
#endif
}
} // namespace
MediaStreamDevicesController::MediaStreamDevicesController(
content::WebContents* web_contents,
const content::MediaStreamRequest& request,
const content::MediaResponseCallback& callback)
: web_contents_(web_contents),
request_(request),
callback_(callback),
// For MEDIA_OPEN_DEVICE requests (Pepper) we always request both webcam
// and microphone to avoid popping two infobars.
microphone_requested_(
request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE ||
request.request_type == content::MEDIA_OPEN_DEVICE),
webcam_requested_(
request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE ||
request.request_type == content::MEDIA_OPEN_DEVICE) {
profile_ = Profile::FromBrowserContext(web_contents->GetBrowserContext());
content_settings_ = TabSpecificContentSettings::FromWebContents(web_contents);
// Don't call GetDevicePolicy from the initializer list since the
// implementation depends on member variables.
if (microphone_requested_ &&
GetDevicePolicy(prefs::kAudioCaptureAllowed,
prefs::kAudioCaptureAllowedUrls) == ALWAYS_DENY) {
microphone_requested_ = false;
}
if (webcam_requested_ &&
GetDevicePolicy(prefs::kVideoCaptureAllowed,
prefs::kVideoCaptureAllowedUrls) == ALWAYS_DENY) {
webcam_requested_ = false;
}
}
MediaStreamDevicesController::~MediaStreamDevicesController() {
if (!callback_.is_null()) {
callback_.Run(content::MediaStreamDevices(),
scoped_ptr<content::MediaStreamUI>());
}
}
// static
void MediaStreamDevicesController::RegisterUserPrefs(
user_prefs::PrefRegistrySyncable* prefs) {
prefs->RegisterBooleanPref(prefs::kVideoCaptureAllowed,
true,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
prefs->RegisterBooleanPref(prefs::kAudioCaptureAllowed,
true,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
prefs->RegisterListPref(prefs::kVideoCaptureAllowedUrls,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
prefs->RegisterListPref(prefs::kAudioCaptureAllowedUrls,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
}
bool MediaStreamDevicesController::DismissInfoBarAndTakeActionOnSettings() {
// Tab capture is allowed for extensions only and infobar is not shown for
// extensions.
if (request_.audio_type == content::MEDIA_TAB_AUDIO_CAPTURE ||
request_.video_type == content::MEDIA_TAB_VIDEO_CAPTURE) {
Deny(false);
return true;
}
// Deny the request if the security origin is empty, this happens with
// file access without |--allow-file-access-from-files| flag.
if (request_.security_origin.is_empty()) {
Deny(false);
return true;
}
// Deny the request if there is no device attached to the OS.
if (!HasAnyAvailableDevice()) {
Deny(false);
return true;
}
// Check if any allow exception has been made for this request.
if (IsRequestAllowedByDefault()) {
Accept(false);
return true;
}
// Check if any block exception has been made for this request.
if (IsRequestBlockedByDefault()) {
Deny(false);
return true;
}
// Check if the media default setting is set to block.
if (IsDefaultMediaAccessBlocked()) {
Deny(false);
return true;
}
// Show the infobar.
return false;
}
const std::string& MediaStreamDevicesController::GetSecurityOriginSpec() const {
return request_.security_origin.spec();
}
void MediaStreamDevicesController::Accept(bool update_content_setting) {
// TODO(xians): Remove the following call after the UI handles microphone
// and camera seprately.
if (content_settings_)
content_settings_->OnMediaStreamAllowed();
NotifyUIRequestAccepted();
// Get the default devices for the request.
content::MediaStreamDevices devices;
if (microphone_requested_ || webcam_requested_) {
switch (request_.request_type) {
case content::MEDIA_OPEN_DEVICE:
// For open device request pick the desired device or fall back to the
// first available of the given type.
MediaCaptureDevicesDispatcher::GetInstance()->GetRequestedDevice(
request_.requested_device_id,
request_.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE,
request_.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE,
&devices);
break;
case content::MEDIA_DEVICE_ACCESS:
case content::MEDIA_GENERATE_STREAM:
case content::MEDIA_ENUMERATE_DEVICES:
// Get the default devices for the request.
MediaCaptureDevicesDispatcher::GetInstance()->
GetDefaultDevicesForProfile(profile_,
microphone_requested_,
webcam_requested_,
&devices);
break;
}
if (update_content_setting && IsSchemeSecure() && !devices.empty())
SetPermission(true);
}
scoped_ptr<content::MediaStreamUI> ui;
if (!devices.empty()) {
ui = MediaCaptureDevicesDispatcher::GetInstance()->
GetMediaStreamCaptureIndicator()->RegisterMediaStream(
web_contents_, devices);
}
content::MediaResponseCallback cb = callback_;
callback_.Reset();
cb.Run(devices, ui.Pass());
}
void MediaStreamDevicesController::Deny(bool update_content_setting) {
// TODO(markusheintz): Replace CONTENT_SETTINGS_TYPE_MEDIA_STREAM with the
// appropriate new CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC and
// CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA.
if (content_settings_) {
content_settings_->OnContentBlocked(CONTENT_SETTINGS_TYPE_MEDIASTREAM,
std::string());
}
NotifyUIRequestDenied();
if (update_content_setting)
SetPermission(false);
content::MediaResponseCallback cb = callback_;
callback_.Reset();
cb.Run(content::MediaStreamDevices(), scoped_ptr<content::MediaStreamUI>());
}
MediaStreamDevicesController::DevicePolicy
MediaStreamDevicesController::GetDevicePolicy(
const char* policy_name,
const char* whitelist_policy_name) const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// If the security origin policy matches a value in the whitelist, allow it.
// Otherwise, check the |policy_name| master switch for the default behavior.
PrefService* prefs = profile_->GetPrefs();
// TODO(tommi): Remove the kiosk mode check when the whitelist below
// is visible in the media exceptions UI.
// See discussion here: https://codereview.chromium.org/15738004/
if (IsInKioskMode()) {
const base::ListValue* list = prefs->GetList(whitelist_policy_name);
std::string value;
for (size_t i = 0; i < list->GetSize(); ++i) {
if (list->GetString(i, &value)) {
ContentSettingsPattern pattern =
ContentSettingsPattern::FromString(value);
if (pattern == ContentSettingsPattern::Wildcard()) {
DLOG(WARNING) << "Ignoring wildcard URL pattern: " << value;
continue;
}
DLOG_IF(ERROR, !pattern.IsValid()) << "Invalid URL pattern: " << value;
if (pattern.IsValid() && pattern.Matches(request_.security_origin))
return ALWAYS_ALLOW;
}
}
}
// If a match was not found, check if audio capture is otherwise disallowed
// or if the user should be prompted. Setting the policy value to "true"
// is equal to not setting it at all, so from hereon out, we will return
// either POLICY_NOT_SET (prompt) or ALWAYS_DENY (no prompt, no access).
if (!prefs->GetBoolean(policy_name))
return ALWAYS_DENY;
return POLICY_NOT_SET;
}
bool MediaStreamDevicesController::IsRequestAllowedByDefault() const {
// The request from internal objects like chrome://URLs is always allowed.
if (ShouldAlwaysAllowOrigin())
return true;
struct {
bool has_capability;
const char* policy_name;
const char* list_policy_name;
ContentSettingsType settings_type;
} device_checks[] = {
{ microphone_requested_, prefs::kAudioCaptureAllowed,
prefs::kAudioCaptureAllowedUrls, CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC },
{ webcam_requested_, prefs::kVideoCaptureAllowed,
prefs::kVideoCaptureAllowedUrls,
CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA },
};
for (size_t i = 0; i < ARRAYSIZE_UNSAFE(device_checks); ++i) {
if (!device_checks[i].has_capability)
continue;
DevicePolicy policy = GetDevicePolicy(device_checks[i].policy_name,
device_checks[i].list_policy_name);
if (policy == ALWAYS_DENY ||
(policy == POLICY_NOT_SET &&
profile_->GetHostContentSettingsMap()->GetContentSetting(
request_.security_origin, request_.security_origin,
device_checks[i].settings_type, NO_RESOURCE_IDENTIFIER) !=
CONTENT_SETTING_ALLOW)) {
return false;
}
// If we get here, then either policy is set to ALWAYS_ALLOW or the content
// settings allow the request by default.
}
return true;
}
bool MediaStreamDevicesController::IsRequestBlockedByDefault() const {
if (microphone_requested_ &&
profile_->GetHostContentSettingsMap()->GetContentSetting(
request_.security_origin,
request_.security_origin,
CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC,
NO_RESOURCE_IDENTIFIER) != CONTENT_SETTING_BLOCK) {
return false;
}
if (webcam_requested_ &&
profile_->GetHostContentSettingsMap()->GetContentSetting(
request_.security_origin,
request_.security_origin,
CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
NO_RESOURCE_IDENTIFIER) != CONTENT_SETTING_BLOCK) {
return false;
}
return true;
}
bool MediaStreamDevicesController::IsDefaultMediaAccessBlocked() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// TODO(markusheintz): Replace CONTENT_SETTINGS_TYPE_MEDIA_STREAM with the
// appropriate new CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC and
// CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA.
ContentSetting current_setting =
profile_->GetHostContentSettingsMap()->GetDefaultContentSetting(
CONTENT_SETTINGS_TYPE_MEDIASTREAM, NULL);
return (current_setting == CONTENT_SETTING_BLOCK);
}
bool MediaStreamDevicesController::IsSchemeSecure() const {
return (request_.security_origin.SchemeIsSecure());
}
bool MediaStreamDevicesController::ShouldAlwaysAllowOrigin() const {
// TODO(markusheintz): Replace CONTENT_SETTINGS_TYPE_MEDIA_STREAM with the
// appropriate new CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC and
// CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA.
return profile_->GetHostContentSettingsMap()->ShouldAllowAllContent(
request_.security_origin, request_.security_origin,
CONTENT_SETTINGS_TYPE_MEDIASTREAM);
}
void MediaStreamDevicesController::SetPermission(bool allowed) const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
#if defined(OS_ANDROID)
// We do not support sticky operations on Android yet.
return;
#endif
ContentSettingsPattern primary_pattern =
ContentSettingsPattern::FromURLNoWildcard(request_.security_origin);
// Check the pattern is valid or not. When the request is from a file access,
// no exception will be made.
if (!primary_pattern.IsValid())
return;
ContentSetting content_setting = allowed ?
CONTENT_SETTING_ALLOW : CONTENT_SETTING_BLOCK;
if (microphone_requested_) {
profile_->GetHostContentSettingsMap()->SetContentSetting(
primary_pattern,
ContentSettingsPattern::Wildcard(),
CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC,
std::string(),
content_setting);
}
if (webcam_requested_) {
profile_->GetHostContentSettingsMap()->SetContentSetting(
primary_pattern,
ContentSettingsPattern::Wildcard(),
CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
std::string(),
content_setting);
}
}
void MediaStreamDevicesController::NotifyUIRequestAccepted() const {
if (!content_settings_)
return;
// We need to figure out which part of the request is accepted or denied here.
// For example, when the request contains both audio and video, but audio is
// blocked by the policy, then we will prompt the infobar to ask for video
// permission. In case the users approve the permission,
// we need to show an allowed icon for video but blocked icon for audio.
if (request_.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE) {
// The request might contain audio while |webcam_requested_| is false,
// this happens when the policy is blocking the audio.
if (microphone_requested_)
content_settings_->OnMicrophoneAccessed();
else
content_settings_->OnMicrophoneAccessBlocked();
}
if (request_.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE) {
// The request might contain video while |webcam_requested_| is false,
// this happens when the policy is blocking the video.
if (webcam_requested_)
content_settings_->OnCameraAccessed();
else
content_settings_->OnCameraAccessBlocked();
}
}
void MediaStreamDevicesController::NotifyUIRequestDenied() const {
if (!content_settings_)
return;
// Do not show the block icons for tab capture.
if (request_.audio_type == content::MEDIA_TAB_AUDIO_CAPTURE ||
request_.video_type == content::MEDIA_TAB_VIDEO_CAPTURE) {
return;
}
if (request_.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE)
content_settings_->OnMicrophoneAccessBlocked();
if (request_.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE)
content_settings_->OnCameraAccessBlocked();
}
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