1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5// Implements the Chrome Extensions Tab Capture API. 6 7#include "chrome/browser/extensions/api/tab_capture/tab_capture_api.h" 8 9#include <set> 10#include <string> 11#include <vector> 12 13#include "base/command_line.h" 14#include "base/strings/stringprintf.h" 15#include "base/values.h" 16#include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h" 17#include "chrome/browser/extensions/extension_renderer_state.h" 18#include "chrome/browser/profiles/profile.h" 19#include "chrome/browser/sessions/session_tab_helper.h" 20#include "chrome/browser/ui/browser.h" 21#include "chrome/browser/ui/browser_finder.h" 22#include "chrome/browser/ui/tabs/tab_strip_model.h" 23#include "content/public/browser/render_frame_host.h" 24#include "content/public/browser/render_process_host.h" 25#include "extensions/common/features/feature.h" 26#include "extensions/common/features/feature_provider.h" 27#include "extensions/common/features/simple_feature.h" 28#include "extensions/common/permissions/permissions_data.h" 29#include "extensions/common/switches.h" 30 31using extensions::api::tab_capture::MediaStreamConstraint; 32 33namespace TabCapture = extensions::api::tab_capture; 34namespace GetCapturedTabs = TabCapture::GetCapturedTabs; 35 36namespace extensions { 37 38namespace { 39 40const char kCapturingSameTab[] = "Cannot capture a tab with an active stream."; 41const char kFindingTabError[] = "Error finding tab to capture."; 42const char kNoAudioOrVideo[] = "Capture failed. No audio or video requested."; 43const char kGrantError[] = 44 "Extension has not been invoked for the current page (see activeTab " 45 "permission). Chrome pages cannot be captured."; 46 47// Keys/values for media stream constraints. 48const char kMediaStreamSource[] = "chromeMediaSource"; 49const char kMediaStreamSourceId[] = "chromeMediaSourceId"; 50const char kMediaStreamSourceTab[] = "tab"; 51 52// Whitelisted extensions that do not check for a browser action grant because 53// they provide API's. 54const char* whitelisted_extensions[] = { 55 "enhhojjnijigcajfphajepfemndkmdlo", // Dev 56 "pkedcjkdefgpdelpbcmbmeomcjbeemfm", // Trusted Tester 57 "fmfcbgogabcbclcofgocippekhfcmgfj", // Staging 58 "hfaagokkkhdbgiakmmlclaapfelnkoah", // Canary 59 "F155646B5D1CA545F7E1E4E20D573DFDD44C2540", // Trusted Tester (public) 60 "16CA7A47AAE4BE49B1E75A6B960C3875E945B264" // Release 61}; 62 63} // namespace 64 65bool TabCaptureCaptureFunction::RunSync() { 66 scoped_ptr<api::tab_capture::Capture::Params> params = 67 TabCapture::Capture::Params::Create(*args_); 68 EXTENSION_FUNCTION_VALIDATE(params.get()); 69 70 // Figure out the active WebContents and retrieve the needed ids. 71 Browser* target_browser = chrome::FindAnyBrowser( 72 GetProfile(), include_incognito(), chrome::GetActiveDesktop()); 73 if (!target_browser) { 74 error_ = kFindingTabError; 75 return false; 76 } 77 78 content::WebContents* target_contents = 79 target_browser->tab_strip_model()->GetActiveWebContents(); 80 if (!target_contents) { 81 error_ = kFindingTabError; 82 return false; 83 } 84 85 const std::string& extension_id = extension()->id(); 86 87 // Make sure either we have been granted permission to capture through an 88 // extension icon click or our extension is whitelisted. 89 if (!extension()->permissions_data()->HasAPIPermissionForTab( 90 SessionTabHelper::IdForTab(target_contents), 91 APIPermission::kTabCaptureForTab) && 92 CommandLine::ForCurrentProcess()->GetSwitchValueASCII( 93 switches::kWhitelistedExtensionID) != extension_id && 94 !SimpleFeature::IsIdInList( 95 extension_id, 96 std::set<std::string>( 97 whitelisted_extensions, 98 whitelisted_extensions + arraysize(whitelisted_extensions)))) { 99 error_ = kGrantError; 100 return false; 101 } 102 103 // Create a constraints vector. We will modify all the constraints in this 104 // vector to append our chrome specific constraints. 105 std::vector<MediaStreamConstraint*> constraints; 106 bool has_audio = params->options.audio.get() && *params->options.audio.get(); 107 bool has_video = params->options.video.get() && *params->options.video.get(); 108 109 if (!has_audio && !has_video) { 110 error_ = kNoAudioOrVideo; 111 return false; 112 } 113 114 if (has_audio) { 115 if (!params->options.audio_constraints.get()) 116 params->options.audio_constraints.reset(new MediaStreamConstraint); 117 118 constraints.push_back(params->options.audio_constraints.get()); 119 } 120 if (has_video) { 121 if (!params->options.video_constraints.get()) 122 params->options.video_constraints.reset(new MediaStreamConstraint); 123 124 constraints.push_back(params->options.video_constraints.get()); 125 } 126 127 // Device id we use for Tab Capture. 128 content::RenderFrameHost* const main_frame = target_contents->GetMainFrame(); 129 // TODO(miu): We should instead use a "randomly generated device ID" scheme, 130 // like that employed by the desktop capture API. http://crbug.com/163100 131 const std::string device_id = base::StringPrintf( 132 "web-contents-media-stream://%i:%i", 133 main_frame->GetProcess()->GetID(), 134 main_frame->GetRoutingID()); 135 136 // Append chrome specific tab constraints. 137 for (std::vector<MediaStreamConstraint*>::iterator it = constraints.begin(); 138 it != constraints.end(); ++it) { 139 base::DictionaryValue* constraint = &(*it)->mandatory.additional_properties; 140 constraint->SetString(kMediaStreamSource, kMediaStreamSourceTab); 141 constraint->SetString(kMediaStreamSourceId, device_id); 142 } 143 144 extensions::TabCaptureRegistry* registry = 145 extensions::TabCaptureRegistry::Get(GetProfile()); 146 if (!registry->AddRequest(target_contents, extension_id)) { 147 error_ = kCapturingSameTab; 148 return false; 149 } 150 151 // Copy the result from our modified input parameters. This will be 152 // intercepted by custom bindings which will build and send the special 153 // WebRTC user media request. 154 base::DictionaryValue* result = new base::DictionaryValue(); 155 result->MergeDictionary(params->options.ToValue().get()); 156 157 SetResult(result); 158 return true; 159} 160 161bool TabCaptureGetCapturedTabsFunction::RunSync() { 162 extensions::TabCaptureRegistry* registry = 163 extensions::TabCaptureRegistry::Get(GetProfile()); 164 base::ListValue* const list = new base::ListValue(); 165 if (registry) 166 registry->GetCapturedTabs(extension()->id(), list); 167 SetResult(list); 168 return true; 169} 170 171} // namespace extensions 172