// Copyright 2013 The Chromium Authors
// 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/webrtc_browsertest_base.h"

#include <stddef.h>

#include <limits>
#include <tuple>

#include "base/json/json_reader.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/to_string.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/extensions/chrome_test_extension_loader.h"
#include "chrome/browser/media/webrtc/webrtc_browsertest_common.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser_tabstrip.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/permissions/permission_request_manager.h"
#include "components/permissions/test/permission_request_observer.h"
#include "content/public/test/browser_test_utils.h"
#include "extensions/browser/extension_registry.h"
#include "net/test/embedded_test_server/embedded_test_server.h"

const char WebRtcTestBase::kAudioVideoCallConstraints[] =
    "{audio: true, video: true}";
const char WebRtcTestBase::kVideoCallConstraintsQVGA[] =
   "{video: {mandatory: {minWidth: 320, maxWidth: 320, "
   " minHeight: 240, maxHeight: 240}}}";
const char WebRtcTestBase::kVideoCallConstraints360p[] =
   "{video: {mandatory: {minWidth: 640, maxWidth: 640, "
   " minHeight: 360, maxHeight: 360}}}";
const char WebRtcTestBase::kVideoCallConstraintsVGA[] =
   "{video: {mandatory: {minWidth: 640, maxWidth: 640, "
   " minHeight: 480, maxHeight: 480}}}";
const char WebRtcTestBase::kVideoCallConstraints720p[] =
   "{video: {mandatory: {minWidth: 1280, maxWidth: 1280, "
   " minHeight: 720, maxHeight: 720}}}";
const char WebRtcTestBase::kVideoCallConstraints1080p[] =
    "{video: {mandatory: {minWidth: 1920, maxWidth: 1920, "
    " minHeight: 1080, maxHeight: 1080}}}";
const char WebRtcTestBase::kAudioOnlyCallConstraints[] = "{audio: true}";
const char WebRtcTestBase::kVideoOnlyCallConstraints[] = "{video: true}";
const char WebRtcTestBase::kOkGotStream[] = "ok-got-stream";
const char WebRtcTestBase::kFailedWithNotAllowedError[] =
    "failed-with-error-NotAllowedError";
const char WebRtcTestBase::kAudioVideoCallConstraints360p[] =
   "{audio: true, video: {mandatory: {minWidth: 640, maxWidth: 640, "
   " minHeight: 360, maxHeight: 360}}}";
const char WebRtcTestBase::kAudioVideoCallConstraints720p[] =
   "{audio: true, video: {mandatory: {minWidth: 1280, maxWidth: 1280, "
   " minHeight: 720, maxHeight: 720}}}";
const char WebRtcTestBase::kUseDefaultCertKeygen[] = "null";
const char WebRtcTestBase::kUseDefaultAudioCodec[] = "";
const char WebRtcTestBase::kUseDefaultVideoCodec[] = "";
const char WebRtcTestBase::kVP9Profile0Specifier[] = "profile-id=0";
const char WebRtcTestBase::kVP9Profile2Specifier[] = "profile-id=2";
const char WebRtcTestBase::kUndefined[] = "undefined";

namespace {

base::LazyInstance<bool>::DestructorAtExit hit_javascript_errors_ =
    LAZY_INSTANCE_INITIALIZER;

// Intercepts all log messages. We always attach this handler but only look at
// the results if the test requests so. Note that this will only work if the
// WebrtcTestBase-inheriting test cases do not run in parallel (if they did they
// would race to look at the log, which is global to all tests).
bool JavascriptErrorDetectingLogHandler(int severity,
                                        const char* file,
                                        int line,
                                        size_t message_start,
                                        const std::string& str) {
  if (file == nullptr || std::string("CONSOLE") != file)
    return false;

  // TODO(crbug.com/40608140): Fix AppRTC and stop ignoring this error.
  if (str.find("Synchronous XHR in page dismissal") != std::string::npos)
    return false;

  bool contains_uncaught = str.find("\"Uncaught ") != std::string::npos;
  if (severity == logging::LOGGING_ERROR ||
      (severity == logging::LOGGING_INFO && contains_uncaught)) {
    hit_javascript_errors_.Get() = true;
  }

  return false;
}

}  // namespace

WebRtcTestBase::WebRtcTestBase(): detect_errors_in_javascript_(false) {
  // The handler gets set for each test method, but that's fine since this
  // set operation is idempotent.
  logging::SetLogMessageHandler(&JavascriptErrorDetectingLogHandler);
  hit_javascript_errors_.Get() = false;

  EnablePixelOutput();
}

WebRtcTestBase::~WebRtcTestBase() {
  if (detect_errors_in_javascript_) {
    EXPECT_FALSE(hit_javascript_errors_.Get())
        << "Encountered javascript errors during test execution (Search "
        << "for Uncaught or ERROR:CONSOLE in the test output).";
  }
}

bool WebRtcTestBase::GetUserMediaAndAccept(
    content::WebContents* tab_contents) const {
  return GetUserMediaWithSpecificConstraintsAndAccept(
      tab_contents, kAudioVideoCallConstraints);
}

bool WebRtcTestBase::GetUserMediaWithSpecificConstraintsAndAccept(
    content::WebContents* tab_contents,
    const std::string& constraints) const {
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  permissions::PermissionRequestObserver observer(tab_contents);
  GetUserMedia(tab_contents, constraints);
  EXPECT_TRUE(observer.request_shown());
  return kOkGotStream == content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                                         "obtainGetUserMediaResult();");
}

bool WebRtcTestBase::GetUserMediaWithSpecificConstraintsAndAcceptIfPrompted(
    content::WebContents* tab_contents,
    const std::string& constraints) const {
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  GetUserMedia(tab_contents, constraints);
  return kOkGotStream == content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                                         "obtainGetUserMediaResult();");
}

void WebRtcTestBase::GetUserMediaAndDeny(content::WebContents* tab_contents) {
  return GetUserMediaWithSpecificConstraintsAndDeny(tab_contents,
                                                    kAudioVideoCallConstraints);
}

void WebRtcTestBase::GetUserMediaWithSpecificConstraintsAndDeny(
    content::WebContents* tab_contents,
    const std::string& constraints) const {
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::DENY_ALL);
  permissions::PermissionRequestObserver observer(tab_contents);
  GetUserMedia(tab_contents, constraints);
  EXPECT_TRUE(observer.request_shown());
  EXPECT_EQ(kFailedWithNotAllowedError,
            content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                            "obtainGetUserMediaResult();"));
}

void WebRtcTestBase::GetUserMediaAndDismiss(
    content::WebContents* tab_contents) const {
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::DISMISS);
  permissions::PermissionRequestObserver observer(tab_contents);
  GetUserMedia(tab_contents, kAudioVideoCallConstraints);
  EXPECT_TRUE(observer.request_shown());
  // A dismiss should be treated like a deny.
  EXPECT_EQ(kFailedWithNotAllowedError,
            content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                            "obtainGetUserMediaResult();"));
}

void WebRtcTestBase::GetUserMediaAndExpectAutoAcceptWithoutPrompt(
    content::WebContents* tab_contents) const {
  // We issue a GetUserMedia() request. We expect that the origin already has a
  // sticky "accept" permission (e.g. because the caller previously called
  // GetUserMediaAndAccept()), and therefore the GetUserMedia() request
  // automatically succeeds without a prompt.
  // If the caller made a mistake, a prompt may show up instead. For this case,
  // we set an auto-response to avoid leaving the prompt hanging. The choice of
  // DENY_ALL makes sure that the response to the prompt doesn't accidentally
  // result in a newly granted media stream permission.
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::DENY_ALL);
  permissions::PermissionRequestObserver observer(tab_contents);
  GetUserMedia(tab_contents, kAudioVideoCallConstraints);
  EXPECT_FALSE(observer.request_shown());
  EXPECT_EQ(kOkGotStream, content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                                          "obtainGetUserMediaResult();"));
}

void WebRtcTestBase::GetUserMediaAndExpectAutoDenyWithoutPrompt(
    content::WebContents* tab_contents) const {
  // We issue a GetUserMedia() request. We expect that the origin already has a
  // sticky "deny" permission (e.g. because the caller previously called
  // GetUserMediaAndDeny()), and therefore the GetUserMedia() request
  // automatically succeeds without a prompt.
  // If the caller made a mistake, a prompt may show up instead. For this case,
  // we set an auto-response to avoid leaving the prompt hanging. The choice of
  // ACCEPT_ALL makes sure that the response to the prompt doesn't accidentally
  // result in a newly granted media stream permission.
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  permissions::PermissionRequestObserver observer(tab_contents);
  GetUserMedia(tab_contents, kAudioVideoCallConstraints);
  EXPECT_FALSE(observer.request_shown());
  EXPECT_EQ(kFailedWithNotAllowedError,
            content::EvalJs(tab_contents->GetPrimaryMainFrame(),
                            "obtainGetUserMediaResult();"));
}

void WebRtcTestBase::GetUserMedia(content::WebContents* tab_contents,
                                  const std::string& constraints) const {
  // Request user media: this will launch the media stream info bar or bubble.
  std::string result =
      content::EvalJs(tab_contents, "doGetUserMedia(" + constraints + ");")
          .ExtractString();
  EXPECT_TRUE(result == "request-callback-denied" ||
              result == "request-callback-granted");
}

void WebRtcTestBase::GetUserMediaReturnsFalseIfWaitIsTooLong(
    content::WebContents* tab_contents,
    const std::string& constraints) const {
  permissions::PermissionRequestManager::FromWebContents(tab_contents)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  permissions::PermissionRequestObserver observer(tab_contents);
  // Request user media: this will launch the media stream info bar or bubble.
  constexpr char kTimeoutSeconds[] = "8";
  EXPECT_EQ(content::EvalJs(tab_contents, "doGetUserMedia(" + constraints +
                                              ", " + kTimeoutSeconds + ");"),
            "request-timedout");
}

content::WebContents* WebRtcTestBase::OpenPageAndGetUserMediaInNewTab(
    const GURL& url) const {
  return OpenPageAndGetUserMediaInNewTabWithConstraints(
      url, kAudioVideoCallConstraints);
}

content::WebContents*
WebRtcTestBase::OpenPageAndGetUserMediaInNewTabWithConstraints(
    const GURL& url,
    const std::string& constraints) const {
  chrome::AddTabAt(browser(), GURL(url::kAboutBlankURL), -1, true);
  EXPECT_TRUE(ui_test_utils::NavigateToURL(browser(), url));
  content::WebContents* new_tab =
      browser()->GetTabStripModel()->GetActiveWebContents();
  // Accept if necessary, but don't expect a prompt (because auto-accept is also
  // okay).
  permissions::PermissionRequestManager::FromWebContents(new_tab)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  GetUserMedia(new_tab, constraints);
  EXPECT_EQ(kOkGotStream, content::EvalJs(new_tab->GetPrimaryMainFrame(),
                                          "obtainGetUserMediaResult();"));
  return new_tab;
}

content::WebContents* WebRtcTestBase::OpenTestPageAndGetUserMediaInNewTab(
    const std::string& test_page) const {
  return OpenPageAndGetUserMediaInNewTab(
      embedded_test_server()->GetURL(test_page));
}

content::WebContents* WebRtcTestBase::OpenTestPageInNewTab(
    const std::string& test_page) const {
  chrome::AddTabAt(browser(), GURL(url::kAboutBlankURL), -1, true);
  GURL url = embedded_test_server()->GetURL(test_page);
  EXPECT_TRUE(ui_test_utils::NavigateToURL(browser(), url));
  content::WebContents* new_tab =
      browser()->GetTabStripModel()->GetActiveWebContents();
  // Accept if necessary, but don't expect a prompt (because auto-accept is also
  // okay).
  permissions::PermissionRequestManager::FromWebContents(new_tab)
      ->set_auto_response_for_test(
          permissions::PermissionRequestManager::ACCEPT_ALL);
  return new_tab;
}

void WebRtcTestBase::CloseLastLocalStream(
    content::WebContents* tab_contents) const {
  EXPECT_EQ("ok-stopped",
            ExecuteJavascript("stopLocalStream();", tab_contents));
}

// Convenience method which executes the provided javascript in the context
// of the provided web contents and returns what it evaluated to.
std::string WebRtcTestBase::ExecuteJavascript(
    const std::string& javascript,
    content::WebContents* tab_contents) const {
  return content::EvalJs(tab_contents, javascript).ExtractString();
}

void WebRtcTestBase::SetupPeerconnectionWithLocalStream(
    content::WebContents* tab,
    const std::string& certificate_keygen_algorithm) const {
  SetupPeerconnectionWithoutLocalStream(tab, certificate_keygen_algorithm);
  EXPECT_EQ("ok-added", ExecuteJavascript("addLocalStream()", tab));
}

void WebRtcTestBase::SetupPeerconnectionWithoutLocalStream(
    content::WebContents* tab,
    const std::string& certificate_keygen_algorithm) const {
  std::string javascript = base::StringPrintf(
      "preparePeerConnection(%s)", certificate_keygen_algorithm.c_str());
  EXPECT_EQ("ok-peerconnection-created", ExecuteJavascript(javascript, tab));
}

void WebRtcTestBase::SetupPeerconnectionWithCertificateAndLocalStream(
    content::WebContents* tab,
    const std::string& certificate) const {
  SetupPeerconnectionWithCertificateWithoutLocalStream(tab, certificate);
  EXPECT_EQ("ok-added", ExecuteJavascript("addLocalStream()", tab));
}

void WebRtcTestBase::SetupPeerconnectionWithCertificateWithoutLocalStream(
    content::WebContents* tab,
    const std::string& certificate) const {
  std::string javascript = base::StringPrintf(
      "preparePeerConnectionWithCertificate(%s)", certificate.c_str());
  EXPECT_EQ("ok-peerconnection-created", ExecuteJavascript(javascript, tab));
}

void WebRtcTestBase::SetupPeerconnectionWithConstraintsAndLocalStream(
    content::WebContents* tab,
    const std::string& constraints,
    const std::string& certificate_keygen_algorithm) const {
  std::string javascript = base::StringPrintf(
      "preparePeerConnection(%s, %s)", certificate_keygen_algorithm.c_str(),
      constraints.c_str());
  EXPECT_EQ("ok-peerconnection-created", ExecuteJavascript(javascript, tab));
  EXPECT_EQ("ok-added", ExecuteJavascript("addLocalStream()", tab));
}

std::string WebRtcTestBase::CreateLocalOffer(
    content::WebContents* from_tab) const {
  std::string response = ExecuteJavascript("createLocalOffer({})", from_tab);
  EXPECT_EQ("ok-", response.substr(0, 3)) << "Failed to create local offer: "
      << response;

  std::string local_offer = response.substr(3);
  return local_offer;
}

std::string WebRtcTestBase::CreateAnswer(std::string local_offer,
                                         content::WebContents* to_tab) const {
  std::string javascript =
      base::StringPrintf("receiveOfferFromPeer('%s', {})", local_offer.c_str());
  std::string response = ExecuteJavascript(javascript, to_tab);
  EXPECT_EQ("ok-", response.substr(0, 3))
      << "Receiving peer failed to receive offer and create answer: "
      << response;

  std::string answer = response.substr(3);
  response = ExecuteJavascript(
      base::StringPrintf("verifyDefaultCodecs('%s')", answer.c_str()),
      to_tab);
  EXPECT_EQ("ok-", response.substr(0, 3))
      << "Receiving peer failed to verify default codec: " << response;
  return answer;
}

void WebRtcTestBase::ReceiveAnswer(const std::string& answer,
                                   content::WebContents* from_tab) const {
  ASSERT_EQ(
      "ok-accepted-answer",
      ExecuteJavascript(
          base::StringPrintf("receiveAnswerFromPeer('%s')", answer.c_str()),
          from_tab));
}

void WebRtcTestBase::GatherAndSendIceCandidates(
    content::WebContents* from_tab,
    content::WebContents* to_tab) const {
  std::string ice_candidates =
      ExecuteJavascript("getAllIceCandidates()", from_tab);

  EXPECT_EQ("ok-received-candidates", ExecuteJavascript(
      base::StringPrintf("receiveIceCandidates('%s')", ice_candidates.c_str()),
      to_tab));
}

void WebRtcTestBase::CreateDataChannel(content::WebContents* tab,
                                       const std::string& label) {
  EXPECT_EQ("ok-created",
            ExecuteJavascript("createDataChannel('" + label + "')", tab));
}

void WebRtcTestBase::NegotiateCall(content::WebContents* from_tab,
                                   content::WebContents* to_tab) const {
  std::string local_offer = CreateLocalOffer(from_tab);
  std::string answer = CreateAnswer(local_offer, to_tab);
  ReceiveAnswer(answer, from_tab);

  // Send all ICE candidates (wait for gathering to finish if necessary).
  GatherAndSendIceCandidates(to_tab, from_tab);
  GatherAndSendIceCandidates(from_tab, to_tab);
}

void WebRtcTestBase::VerifyLocalDescriptionContainsCertificate(
    content::WebContents* tab,
    const std::string& certificate) const {
  std::string javascript = base::StringPrintf(
      "verifyLocalDescriptionContainsCertificate(%s)", certificate.c_str());
  EXPECT_EQ("ok-verified", ExecuteJavascript(javascript, tab));
}

void WebRtcTestBase::HangUp(content::WebContents* from_tab) const {
  EXPECT_EQ("ok-call-hung-up", ExecuteJavascript("hangUp()", from_tab));
}

void WebRtcTestBase::DetectErrorsInJavaScript() {
  detect_errors_in_javascript_ = true;
}

void WebRtcTestBase::StartDetectingVideo(
    content::WebContents* tab_contents,
    const std::string& video_element) const {
  std::string javascript = base::StringPrintf(
      "startDetection('%s', 320, 240)", video_element.c_str());
  EXPECT_EQ("ok-started", ExecuteJavascript(javascript, tab_contents));
}

bool WebRtcTestBase::WaitForVideoToPlay(
    content::WebContents* tab_contents) const {
  bool is_video_playing = test::PollingWaitUntil(
      "isVideoPlaying()", "video-playing", tab_contents);
  EXPECT_TRUE(is_video_playing);
  return is_video_playing;
}

bool WebRtcTestBase::WaitForVideoToStop(
    content::WebContents* tab_contents) const {
  bool is_video_stopped =
      test::PollingWaitUntil("isVideoStopped()", "video-stopped", tab_contents);
  EXPECT_TRUE(is_video_stopped);
  return is_video_stopped;
}

void WebRtcTestBase::EnableVideoFrameCallbacks(
    content::WebContents* tab_contents,
    const std::string& video_element) const {
  std::string javascript = base::StringPrintf("enableVideoFrameCallbacks('%s')",
                                              video_element.c_str());
  EXPECT_EQ("ok-started", ExecuteJavascript(javascript, tab_contents));
}

int WebRtcTestBase::GetNumVideoFrameCallbacks(
    content::WebContents* tab_contents) const {
  int counter = 0;
  auto result = ExecuteJavascript("getNumVideoFrameCallbacks()", tab_contents);
  if (base::StringToInt(result, &counter)) {
    return counter;
  }
  return -1;
}

std::string WebRtcTestBase::GetStreamSize(
    content::WebContents* tab_contents,
    const std::string& video_element) const {
  std::string javascript =
      base::StringPrintf("getStreamSize('%s')", video_element.c_str());
  std::string result = ExecuteJavascript(javascript, tab_contents);
  EXPECT_TRUE(base::StartsWith(result, "ok-", base::CompareCase::SENSITIVE));
  return result.substr(3);
}

void WebRtcTestBase::OpenDatabase(content::WebContents* tab) const {
  EXPECT_EQ("ok-database-opened", ExecuteJavascript("openDatabase()", tab));
}

void WebRtcTestBase::CloseDatabase(content::WebContents* tab) const {
  EXPECT_EQ("ok-database-closed", ExecuteJavascript("closeDatabase()", tab));
}

void WebRtcTestBase::DeleteDatabase(content::WebContents* tab) const {
  EXPECT_EQ("ok-database-deleted", ExecuteJavascript("deleteDatabase()", tab));
}

void WebRtcTestBase::GenerateAndCloneCertificate(
    content::WebContents* tab, const std::string& keygen_algorithm) const {
  std::string javascript = base::StringPrintf(
      "generateAndCloneCertificate(%s)", keygen_algorithm.c_str());
  EXPECT_EQ("ok-generated-and-cloned", ExecuteJavascript(javascript, tab));
}

scoped_refptr<content::TestStatsReportDictionary>
WebRtcTestBase::GetStatsReportDictionary(content::WebContents* tab) const {
  std::string result = ExecuteJavascript("getStatsReportDictionary()", tab);
  EXPECT_TRUE(base::StartsWith(result, "ok-", base::CompareCase::SENSITIVE));
  std::optional<base::Value> parsed_json = base::JSONReader::Read(
      result.substr(3), base::JSON_PARSE_CHROMIUM_EXTENSIONS);
  CHECK(parsed_json);
  base::DictValue* dictionary = parsed_json->GetIfDict();
  CHECK(dictionary);
  return base::MakeRefCounted<content::TestStatsReportDictionary>(
      std::move(*dictionary));
}

double WebRtcTestBase::MeasureGetStatsPerformance(
    content::WebContents* tab) const {
  std::string result = ExecuteJavascript("measureGetStatsPerformance()", tab);
  EXPECT_TRUE(base::StartsWith(result, "ok-", base::CompareCase::SENSITIVE));
  double ms;
  if (!base::StringToDouble(result.substr(3), &ms))
    return std::numeric_limits<double>::infinity();
  return ms;
}

void WebRtcTestBase::SetDefaultAudioCodec(
    content::WebContents* tab,
    const std::string& audio_codec) const {
  EXPECT_EQ("ok", ExecuteJavascript(
      "setDefaultAudioCodec('" + audio_codec + "')", tab));
}

void WebRtcTestBase::SetDefaultVideoCodec(content::WebContents* tab,
                                          const std::string& video_codec,
                                          bool prefer_hw_codec,
                                          const std::string& profile) const {
  std::string codec_profile = profile;
  // When no |profile| is given, we default VP9 to Profile 0.
  if (video_codec.compare("VP9") == 0 && codec_profile.empty())
    codec_profile = kVP9Profile0Specifier;

  EXPECT_EQ("ok", ExecuteJavascript(
                      "setDefaultVideoCodec('" + video_codec + "'," +
                          base::ToString(prefer_hw_codec) + "," +
                          (codec_profile.empty() ? "null"
                                                 : "'" + codec_profile + "'") +
                          ")",
                      tab));
}

void WebRtcTestBase::EnableOpusDtx(content::WebContents* tab) const {
  EXPECT_EQ("ok-forced", ExecuteJavascript("forceOpusDtx()", tab));
}

std::string WebRtcTestBase::GetDesktopMediaStream(content::WebContents* tab) {
  DCHECK(static_cast<bool>(LoadDesktopCaptureExtension()));

  // Post a task to the extension, opening a desktop media stream.
  return ExecuteJavascript("openDesktopMediaStream()", tab);
}

std::optional<std::string> WebRtcTestBase::LoadDesktopCaptureExtension() {
  std::optional<std::string> extension_id;
  if (!desktop_capture_extension_.get()) {
    extensions::ChromeTestExtensionLoader loader(browser()->GetProfile());
    base::FilePath extension_path;
    EXPECT_TRUE(base::PathService::Get(chrome::DIR_TEST_DATA, &extension_path));
    extension_path = extension_path.AppendASCII("extensions/desktop_capture");
    desktop_capture_extension_ = loader.LoadExtension(extension_path);
    LOG(INFO) << "Loaded desktop capture extension, id = "
              << desktop_capture_extension_->id();

    extensions::ExtensionRegistry* registry =
        extensions::ExtensionRegistry::Get(browser()->GetProfile());

    EXPECT_TRUE(registry->enabled_extensions().GetByID(
        desktop_capture_extension_->id()));
  }
  if (desktop_capture_extension_)
    extension_id.emplace(desktop_capture_extension_->id());
  return extension_id;
}