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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.
// Implements the Chrome Extensions Tab Capture API.
#include "chrome/browser/extensions/api/tab_capture/tab_capture_api.h"
#include <set>
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h"
#include "chrome/browser/extensions/event_names.h"
#include "chrome/browser/extensions/extension_renderer_state.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/sessions/session_tab_helper.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/extensions/features/simple_feature.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "extensions/common/features/feature.h"
#include "extensions/common/features/feature_provider.h"
#include "extensions/common/permissions/permissions_data.h"
using extensions::api::tab_capture::MediaStreamConstraint;
namespace TabCapture = extensions::api::tab_capture;
namespace GetCapturedTabs = TabCapture::GetCapturedTabs;
namespace extensions {
namespace {
const char kCapturingSameTab[] = "Cannot capture a tab with an active stream.";
const char kFindingTabError[] = "Error finding tab to capture.";
const char kNoAudioOrVideo[] = "Capture failed. No audio or video requested.";
const char kGrantError[] =
"Extension has not been invoked for the current page (see activeTab "
"permission). Chrome pages cannot be captured.";
// Keys/values for media stream constraints.
const char kMediaStreamSource[] = "chromeMediaSource";
const char kMediaStreamSourceId[] = "chromeMediaSourceId";
const char kMediaStreamSourceTab[] = "tab";
// Whitelisted extensions that do not check for a browser action grant because
// they provide API's.
const char* whitelisted_extensions[] = {
"enhhojjnijigcajfphajepfemndkmdlo", // Dev
"pkedcjkdefgpdelpbcmbmeomcjbeemfm", // Trusted Tester
"fmfcbgogabcbclcofgocippekhfcmgfj", // Staging
"hfaagokkkhdbgiakmmlclaapfelnkoah", // Canary
"F155646B5D1CA545F7E1E4E20D573DFDD44C2540", // Trusted Tester (public)
"16CA7A47AAE4BE49B1E75A6B960C3875E945B264" // Release
};
} // namespace
bool TabCaptureCaptureFunction::RunImpl() {
scoped_ptr<api::tab_capture::Capture::Params> params =
TabCapture::Capture::Params::Create(*args_);
EXTENSION_FUNCTION_VALIDATE(params.get());
// Figure out the active WebContents and retrieve the needed ids.
Browser* target_browser = chrome::FindAnyBrowser(
GetProfile(), include_incognito(), chrome::GetActiveDesktop());
if (!target_browser) {
error_ = kFindingTabError;
return false;
}
content::WebContents* target_contents =
target_browser->tab_strip_model()->GetActiveWebContents();
if (!target_contents) {
error_ = kFindingTabError;
return false;
}
const Extension* extension = GetExtension();
const std::string& extension_id = extension->id();
const int tab_id = SessionID::IdForTab(target_contents);
// Make sure either we have been granted permission to capture through an
// extension icon click or our extension is whitelisted.
if (!PermissionsData::HasAPIPermissionForTab(
extension, tab_id, APIPermission::kTabCaptureForTab) &&
CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kWhitelistedExtensionID) != extension_id &&
!SimpleFeature::IsIdInWhitelist(
extension_id,
std::set<std::string>(
whitelisted_extensions,
whitelisted_extensions + arraysize(whitelisted_extensions)))) {
error_ = kGrantError;
return false;
}
content::RenderViewHost* const rvh = target_contents->GetRenderViewHost();
int render_process_id = rvh->GetProcess()->GetID();
int routing_id = rvh->GetRoutingID();
// Create a constraints vector. We will modify all the constraints in this
// vector to append our chrome specific constraints.
std::vector<MediaStreamConstraint*> constraints;
bool has_audio = params->options.audio.get() && *params->options.audio.get();
bool has_video = params->options.video.get() && *params->options.video.get();
if (!has_audio && !has_video) {
error_ = kNoAudioOrVideo;
return false;
}
if (has_audio) {
if (!params->options.audio_constraints.get())
params->options.audio_constraints.reset(new MediaStreamConstraint);
constraints.push_back(params->options.audio_constraints.get());
}
if (has_video) {
if (!params->options.video_constraints.get())
params->options.video_constraints.reset(new MediaStreamConstraint);
constraints.push_back(params->options.video_constraints.get());
}
// Device id we use for Tab Capture.
std::string device_id =
base::StringPrintf("%i:%i", render_process_id, routing_id);
// Append chrome specific tab constraints.
for (std::vector<MediaStreamConstraint*>::iterator it = constraints.begin();
it != constraints.end(); ++it) {
base::DictionaryValue* constraint = &(*it)->mandatory.additional_properties;
constraint->SetString(kMediaStreamSource, kMediaStreamSourceTab);
constraint->SetString(kMediaStreamSourceId, device_id);
}
extensions::TabCaptureRegistry* registry =
extensions::TabCaptureRegistry::Get(GetProfile());
if (!registry->AddRequest(render_process_id,
routing_id,
extension_id,
tab_id,
tab_capture::TAB_CAPTURE_STATE_NONE)) {
error_ = kCapturingSameTab;
return false;
}
// Copy the result from our modified input parameters. This will be
// intercepted by custom bindings which will build and send the special
// WebRTC user media request.
base::DictionaryValue* result = new base::DictionaryValue();
result->MergeDictionary(params->options.ToValue().get());
SetResult(result);
return true;
}
bool TabCaptureGetCapturedTabsFunction::RunImpl() {
extensions::TabCaptureRegistry* registry =
extensions::TabCaptureRegistry::Get(GetProfile());
const TabCaptureRegistry::RegistryCaptureInfo& captured_tabs =
registry->GetCapturedTabs(GetExtension()->id());
base::ListValue *list = new base::ListValue();
for (TabCaptureRegistry::RegistryCaptureInfo::const_iterator it =
captured_tabs.begin(); it != captured_tabs.end(); ++it) {
scoped_ptr<tab_capture::CaptureInfo> info(new tab_capture::CaptureInfo());
info->tab_id = it->first;
info->status = it->second;
list->Append(info->ToValue().release());
}
SetResult(list);
return true;
}
} // namespace extensions
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