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// Copyright 2017 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 "content/browser/media/media_devices_util.h"
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/task/post_task.h"
#include "content/browser/frame_host/render_frame_host_delegate.h"
#include "content/browser/frame_host/render_frame_host_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/media_device_id.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_client.h"
#include "media/base/media_switches.h"
#include "third_party/blink/public/common/mediastream/media_stream_request.h"
namespace content {
namespace {
std::string GetDefaultMediaDeviceIDOnUIThread(
blink::MediaDeviceType device_type,
int render_process_id,
int render_frame_id) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
RenderFrameHostImpl* frame_host =
RenderFrameHostImpl::FromID(render_process_id, render_frame_id);
if (!frame_host)
return std::string();
RenderFrameHostDelegate* delegate = frame_host->delegate();
if (!delegate)
return std::string();
blink::mojom::MediaStreamType media_stream_type;
switch (device_type) {
case blink::MEDIA_DEVICE_TYPE_AUDIO_INPUT:
media_stream_type = blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE;
break;
case blink::MEDIA_DEVICE_TYPE_VIDEO_INPUT:
media_stream_type = blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE;
break;
default:
return std::string();
}
return delegate->GetDefaultMediaDeviceID(media_stream_type);
}
// This function is intended for testing purposes. It returns an empty string
// if no default device is supplied via the command line.
std::string GetDefaultMediaDeviceIDFromCommandLine(
blink::MediaDeviceType device_type) {
DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kUseFakeDeviceForMediaStream));
const std::string option =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kUseFakeDeviceForMediaStream);
// Optional comma delimited parameters to the command line can specify values
// for the default device IDs.
// Examples: "video-input-default-id=mycam, audio-input-default-id=mymic"
base::StringTokenizer option_tokenizer(option, ", ");
option_tokenizer.set_quote_chars("\"");
while (option_tokenizer.GetNext()) {
std::vector<std::string> param =
base::SplitString(option_tokenizer.token(), "=", base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
if (param.size() != 2u) {
DLOG(WARNING) << "Forgot a value '" << option << "'? Use name=value for "
<< switches::kUseFakeDeviceForMediaStream << ".";
return std::string();
}
if (device_type == blink::MEDIA_DEVICE_TYPE_AUDIO_INPUT &&
param.front() == "audio-input-default-id") {
return param.back();
} else if (device_type == blink::MEDIA_DEVICE_TYPE_VIDEO_INPUT &&
param.front() == "video-input-default-id") {
return param.back();
}
}
return std::string();
}
} // namespace
MediaDeviceSaltAndOrigin::MediaDeviceSaltAndOrigin() = default;
MediaDeviceSaltAndOrigin::MediaDeviceSaltAndOrigin(std::string device_id_salt,
std::string group_id_salt,
url::Origin origin)
: device_id_salt(std::move(device_id_salt)),
group_id_salt(std::move(group_id_salt)),
origin(std::move(origin)) {}
void GetDefaultMediaDeviceID(
blink::MediaDeviceType device_type,
int render_process_id,
int render_frame_id,
const base::Callback<void(const std::string&)>& callback) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kUseFakeDeviceForMediaStream)) {
std::string command_line_default_device_id =
GetDefaultMediaDeviceIDFromCommandLine(device_type);
if (!command_line_default_device_id.empty()) {
callback.Run(command_line_default_device_id);
return;
}
}
base::PostTaskAndReplyWithResult(
FROM_HERE, {BrowserThread::UI},
base::Bind(&GetDefaultMediaDeviceIDOnUIThread, device_type,
render_process_id, render_frame_id),
callback);
}
MediaDeviceSaltAndOrigin GetMediaDeviceSaltAndOrigin(int render_process_id,
int render_frame_id) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
RenderFrameHostImpl* frame_host =
RenderFrameHostImpl::FromID(render_process_id, render_frame_id);
RenderProcessHost* process_host =
RenderProcessHost::FromID(render_process_id);
url::Origin origin;
GURL url;
GURL site_for_cookies;
url::Origin top_level_origin;
std::string frame_salt;
if (frame_host) {
origin = frame_host->GetLastCommittedOrigin();
url = frame_host->GetLastCommittedURL();
site_for_cookies = frame_host->ComputeSiteForCookies();
top_level_origin = frame_host->frame_tree_node()
->frame_tree()
->GetMainFrame()
->GetLastCommittedOrigin();
frame_salt = frame_host->GetMediaDeviceIDSaltBase();
}
bool are_persistent_ids_allowed = false;
std::string device_id_salt;
std::string group_id_salt;
if (process_host) {
are_persistent_ids_allowed =
GetContentClient()->browser()->ArePersistentMediaDeviceIDsAllowed(
process_host->GetBrowserContext(), url, site_for_cookies,
top_level_origin);
device_id_salt = process_host->GetBrowserContext()->GetMediaDeviceIDSalt();
group_id_salt = device_id_salt;
}
// If persistent IDs are not allowed, append |frame_salt| to make it
// specific to the current document.
if (!are_persistent_ids_allowed)
device_id_salt += frame_salt;
// |group_id_salt| must be unique per document, but it must also change if
// cookies are cleared. Also, it must be different from |device_id_salt|,
// thus appending a constant.
group_id_salt += frame_salt + "groupid";
return {std::move(device_id_salt), std::move(group_id_salt),
std::move(origin)};
}
blink::WebMediaDeviceInfo TranslateMediaDeviceInfo(
bool has_permission,
const MediaDeviceSaltAndOrigin& salt_and_origin,
const blink::WebMediaDeviceInfo& device_info) {
return blink::WebMediaDeviceInfo(
GetHMACForMediaDeviceID(salt_and_origin.device_id_salt,
salt_and_origin.origin, device_info.device_id),
has_permission ? device_info.label : std::string(),
device_info.group_id.empty()
? std::string()
: GetHMACForMediaDeviceID(salt_and_origin.group_id_salt,
salt_and_origin.origin,
device_info.group_id),
has_permission ? device_info.video_facing
: media::MEDIA_VIDEO_FACING_NONE);
}
blink::WebMediaDeviceInfoArray TranslateMediaDeviceInfoArray(
bool has_permission,
const MediaDeviceSaltAndOrigin& salt_and_origin,
const blink::WebMediaDeviceInfoArray& device_infos) {
blink::WebMediaDeviceInfoArray result;
for (const auto& device_info : device_infos) {
result.push_back(
TranslateMediaDeviceInfo(has_permission, salt_and_origin, device_info));
}
return result;
}
} // namespace content
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