mojo/runner/context.cc

   1 // Copyright 2013 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 #include "mojo/runner/context.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/files/file_path.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/scoped_vector.h"
  16 #include "base/path_service.h"
  17 #include "base/run_loop.h"
  18 #include "base/strings/string_number_conversions.h"
  19 #include "base/strings/string_split.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/trace_event/trace_event.h"
  22 #include "build/build_config.h"
  23 #include "components/devtools_service/public/cpp/switches.h"
  24 #include "components/devtools_service/public/interfaces/devtools_service.mojom.h"
  25 #include "mojo/application/public/cpp/application_connection.h"
  26 #include "mojo/application/public/cpp/application_delegate.h"
  27 #include "mojo/application/public/cpp/application_impl.h"
  28 #include "mojo/common/trace_controller_impl.h"
  29 #include "mojo/common/tracing_impl.h"
  30 #include "mojo/edk/embedder/embedder.h"
  31 #include "mojo/edk/embedder/simple_platform_support.h"
  32 #include "mojo/runner/about_fetcher.h"
  33 #include "mojo/runner/in_process_native_runner.h"
  34 #include "mojo/runner/out_of_process_native_runner.h"
  35 #include "mojo/runner/switches.h"
  36 #include "mojo/services/tracing/tracing.mojom.h"
  37 #include "mojo/shell/application_loader.h"
  38 #include "mojo/shell/application_manager.h"
  39 #include "mojo/shell/switches.h"
  40 #include "mojo/util/filename_util.h"
  41 #include "url/gurl.h"
  42
  43 namespace mojo {
  44 namespace runner {
  45 namespace {
  46
  47 // Used to ensure we only init once.
  48 class Setup {
  49  public:
  50   Setup() {
  51     embedder::Init(make_scoped_ptr(new embedder::SimplePlatformSupport()));
  52   }
  53
  54   ~Setup() {}
  55
  56  private:
  57   DISALLOW_COPY_AND_ASSIGN(Setup);
  58 };
  59
  60 bool ConfigureURLMappings(const base::CommandLine& command_line,
  61                           Context* context) {
  62   URLResolver* resolver = context->url_resolver();
  63
  64   // Configure the resolution of unknown mojo: URLs.
  65   GURL base_url;
  66   if (!command_line.HasSwitch(switches::kUseUpdater)) {
  67     // Use the shell's file root if the base was not specified.
  68     base_url = context->ResolveShellFileURL(std::string());
  69   }
  70
  71   if (base_url.is_valid())
  72     resolver->SetMojoBaseURL(base_url);
  73
  74   // The network service and updater must be loaded from the filesystem.
  75   // This mapping is done before the command line URL mapping are processed, so
  76   // that it can be overridden.
  77   resolver->AddURLMapping(GURL("mojo:network_service"),
  78                           context->ResolveShellFileURL(
  79                               "file:network_service/network_service.mojo"));
  80   resolver->AddURLMapping(
  81       GURL("mojo:updater"),
  82       context->ResolveShellFileURL("file:updater/updater.mojo"));
  83
  84   // Command line URL mapping.
  85   std::vector<URLResolver::OriginMapping> origin_mappings =
  86       URLResolver::GetOriginMappings(command_line.argv());
  87   for (const auto& origin_mapping : origin_mappings)
  88     resolver->AddOriginMapping(GURL(origin_mapping.origin),
  89                                GURL(origin_mapping.base_url));
  90
  91   if (command_line.HasSwitch(switches::kURLMappings)) {
  92     const std::string mappings =
  93         command_line.GetSwitchValueASCII(switches::kURLMappings);
  94
  95     base::StringPairs pairs;
  96     if (!base::SplitStringIntoKeyValuePairs(mappings, '=', ',', &pairs))
  97       return false;
  98     using StringPair = std::pair<std::string, std::string>;
  99     for (const StringPair& pair : pairs) {
 100       const GURL from(pair.first);
 101       const GURL to = context->ResolveCommandLineURL(pair.second);
 102       if (!from.is_valid() || !to.is_valid())
 103         return false;
 104       resolver->AddURLMapping(from, to);
 105     }
 106   }
 107
 108   return true;
 109 }
 110
 111 void InitContentHandlers(shell::ApplicationManager* manager,
 112                          const base::CommandLine& command_line) {
 113   // Default content handlers.
 114   manager->RegisterContentHandler("application/pdf", GURL("mojo:pdf_viewer"));
 115   manager->RegisterContentHandler("image/png", GURL("mojo:png_viewer"));
 116   manager->RegisterContentHandler("text/html", GURL("mojo:html_viewer"));
 117
 118   // Command-line-specified content handlers.
 119   std::string handlers_spec =
 120       command_line.GetSwitchValueASCII(switches::kContentHandlers);
 121   if (handlers_spec.empty())
 122     return;
 123
 124 #if defined(OS_ANDROID)
 125   // TODO(eseidel): On Android we pass command line arguments is via the
 126   // 'parameters' key on the intent, which we specify during 'am shell start'
 127   // via --esa, however that expects comma-separated values and says:
 128   //   am shell --help:
 129   //     [--esa <EXTRA_KEY> <EXTRA_STRING_VALUE>[,<EXTRA_STRING_VALUE...]]
 130   //     (to embed a comma into a string escape it using "\,")
 131   // Whatever takes 'parameters' and constructs a CommandLine is failing to
 132   // un-escape the commas, we need to move this fix to that file.
 133   base::ReplaceSubstringsAfterOffset(&handlers_spec, 0, "\\,", ",");
 134 #endif
 135
 136   std::vector<std::string> parts;
 137   base::SplitString(handlers_spec, ',', &parts);
 138   if (parts.size() % 2 != 0) {
 139     LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 140                << ": must be a comma-separated list of mimetype/url pairs."
 141                << handlers_spec;
 142     return;
 143   }
 144
 145   for (size_t i = 0; i < parts.size(); i += 2) {
 146     GURL url(parts[i + 1]);
 147     if (!url.is_valid()) {
 148       LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 149                  << ": '" << parts[i + 1] << "' is not a valid URL.";
 150       return;
 151     }
 152     // TODO(eseidel): We should also validate that the mimetype is valid
 153     // net/base/mime_util.h could do this, but we don't want to depend on net.
 154     manager->RegisterContentHandler(parts[i], url);
 155   }
 156 }
 157
 158 void InitNativeOptions(shell::ApplicationManager* manager,
 159                        const base::CommandLine& command_line) {
 160   std::vector<std::string> force_in_process_url_list;
 161   base::SplitString(command_line.GetSwitchValueASCII(switches::kForceInProcess),
 162                     ',', &force_in_process_url_list);
 163   for (const auto& force_in_process_url : force_in_process_url_list) {
 164     GURL gurl(force_in_process_url);
 165     if (!gurl.is_valid()) {
 166       LOG(ERROR) << "Invalid value for switch " << switches::kForceInProcess
 167                  << ": '" << force_in_process_url << "'is not a valid URL.";
 168       return;
 169     }
 170
 171     shell::NativeRunnerFactory::Options options;
 172     options.force_in_process = true;
 173     manager->SetNativeOptionsForURL(options, gurl);
 174   }
 175 }
 176
 177 void InitDevToolsServiceIfNeeded(shell::ApplicationManager* manager,
 178                                  const base::CommandLine& command_line) {
 179   if (!command_line.HasSwitch(devtools_service::kRemoteDebuggingPort))
 180     return;
 181
 182   std::string port_str =
 183       command_line.GetSwitchValueASCII(devtools_service::kRemoteDebuggingPort);
 184   unsigned port;
 185   if (!base::StringToUint(port_str, &port) || port > 65535) {
 186     LOG(ERROR) << "Invalid value for switch "
 187                << devtools_service::kRemoteDebuggingPort << ": '" << port_str
 188                << "' is not a valid port number.";
 189     return;
 190   }
 191
 192   ServiceProviderPtr devtools_service_provider;
 193   URLRequestPtr request(URLRequest::New());
 194   request->url = "mojo:devtools_service";
 195   manager->ConnectToApplication(
 196       nullptr, request.Pass(), std::string(), GURL("mojo:shell"),
 197       GetProxy(&devtools_service_provider), nullptr,
 198       shell::GetPermissiveCapabilityFilter(), base::Closure());
 199
 200   devtools_service::DevToolsCoordinatorPtr devtools_coordinator;
 201   devtools_service_provider->ConnectToService(
 202       devtools_service::DevToolsCoordinator::Name_,
 203       GetProxy(&devtools_coordinator).PassMessagePipe());
 204   devtools_coordinator->Initialize(static_cast<uint16_t>(port));
 205 }
 206
 207 class TracingServiceProvider : public ServiceProvider {
 208  public:
 209   explicit TracingServiceProvider(InterfaceRequest<ServiceProvider> request)
 210       : binding_(this, request.Pass()) {}
 211   ~TracingServiceProvider() override {}
 212
 213   void ConnectToService(const String& service_name,
 214                         ScopedMessagePipeHandle client_handle) override {
 215     if (service_name == tracing::TraceController::Name_) {
 216       new TraceControllerImpl(
 217           MakeRequest<tracing::TraceController>(client_handle.Pass()));
 218     }
 219   }
 220
 221  private:
 222   StrongBinding<ServiceProvider> binding_;
 223
 224   DISALLOW_COPY_AND_ASSIGN(TracingServiceProvider);
 225 };
 226
 227 }  // namespace
 228
 229 Context::Context() : application_manager_(this) {
 230   DCHECK(!base::MessageLoop::current());
 231
 232   // By default assume that the local apps reside alongside the shell.
 233   // TODO(ncbray): really, this should be passed in rather than defaulting.
 234   // This default makes sense for desktop but not Android.
 235   base::FilePath shell_dir;
 236   PathService::Get(base::DIR_MODULE, &shell_dir);
 237   SetShellFileRoot(shell_dir);
 238
 239   base::FilePath cwd;
 240   PathService::Get(base::DIR_CURRENT, &cwd);
 241   SetCommandLineCWD(cwd);
 242 }
 243
 244 Context::~Context() {
 245   DCHECK(!base::MessageLoop::current());
 246 }
 247
 248 // static
 249 void Context::EnsureEmbedderIsInitialized() {
 250   static base::LazyInstance<Setup>::Leaky setup = LAZY_INSTANCE_INITIALIZER;
 251   setup.Get();
 252 }
 253
 254 void Context::SetShellFileRoot(const base::FilePath& path) {
 255   shell_file_root_ =
 256       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 257 }
 258
 259 GURL Context::ResolveShellFileURL(const std::string& path) {
 260   return shell_file_root_.Resolve(path);
 261 }
 262
 263 void Context::SetCommandLineCWD(const base::FilePath& path) {
 264   command_line_cwd_ =
 265       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 266 }
 267
 268 GURL Context::ResolveCommandLineURL(const std::string& path) {
 269   return command_line_cwd_.Resolve(path);
 270 }
 271
 272 bool Context::Init() {
 273   TRACE_EVENT0("mojo_shell", "Context::Init");
 274   const base::CommandLine& command_line =
 275       *base::CommandLine::ForCurrentProcess();
 276
 277   EnsureEmbedderIsInitialized();
 278   task_runners_.reset(
 279       new TaskRunners(base::MessageLoop::current()->task_runner()));
 280
 281   // TODO(vtl): Probably these failures should be checked before |Init()|, and
 282   // this function simply shouldn't fail.
 283   if (!shell_file_root_.is_valid())
 284     return false;
 285   if (!ConfigureURLMappings(command_line, this))
 286     return false;
 287
 288   // TODO(vtl): This should be MASTER, not NONE.
 289   embedder::InitIPCSupport(
 290       embedder::ProcessType::NONE, task_runners_->shell_runner(), this,
 291       task_runners_->io_runner(), embedder::ScopedPlatformHandle());
 292
 293   scoped_ptr<shell::NativeRunnerFactory> runner_factory;
 294   if (command_line.HasSwitch(switches::kEnableMultiprocess))
 295     runner_factory.reset(new OutOfProcessNativeRunnerFactory(this));
 296   else
 297     runner_factory.reset(new InProcessNativeRunnerFactory(this));
 298   application_manager_.set_blocking_pool(task_runners_->blocking_pool());
 299   application_manager_.set_native_runner_factory(runner_factory.Pass());
 300   application_manager_.set_disable_cache(
 301       base::CommandLine::ForCurrentProcess()->HasSwitch(
 302           switches::kDisableCache));
 303
 304   InitContentHandlers(&application_manager_, command_line);
 305   InitNativeOptions(&application_manager_, command_line);
 306
 307   ServiceProviderPtr tracing_service_provider_ptr;
 308   new TracingServiceProvider(GetProxy(&tracing_service_provider_ptr));
 309   mojo::URLRequestPtr request(mojo::URLRequest::New());
 310   request->url = mojo::String::From("mojo:tracing");
 311   application_manager_.ConnectToApplication(
 312       nullptr, request.Pass(), std::string(), GURL(""), nullptr,
 313       tracing_service_provider_ptr.Pass(),
 314       shell::GetPermissiveCapabilityFilter(), base::Closure());
 315
 316   InitDevToolsServiceIfNeeded(&application_manager_, command_line);
 317
 318   return true;
 319 }
 320
 321 void Context::Shutdown() {
 322   TRACE_EVENT0("mojo_shell", "Context::Shutdown");
 323   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 324             task_runners_->shell_runner());
 325   embedder::ShutdownIPCSupport();
 326   // We'll quit when we get OnShutdownComplete().
 327   base::MessageLoop::current()->Run();
 328 }
 329
 330 GURL Context::ResolveMappings(const GURL& url) {
 331   return url_resolver_.ApplyMappings(url);
 332 }
 333
 334 GURL Context::ResolveMojoURL(const GURL& url) {
 335   return url_resolver_.ResolveMojoURL(url);
 336 }
 337
 338 bool Context::CreateFetcher(
 339     const GURL& url,
 340     const shell::Fetcher::FetchCallback& loader_callback) {
 341   if (url.SchemeIs(AboutFetcher::kAboutScheme)) {
 342     AboutFetcher::Start(url, loader_callback);
 343     return true;
 344   }
 345
 346   return false;
 347 }
 348
 349 void Context::OnShutdownComplete() {
 350   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 351             task_runners_->shell_runner());
 352   base::MessageLoop::current()->Quit();
 353 }
 354
 355 void Context::Run(const GURL& url) {
 356   DCHECK(app_complete_callback_.is_null());
 357   ServiceProviderPtr services;
 358   ServiceProviderPtr exposed_services;
 359
 360   app_urls_.insert(url);
 361   mojo::URLRequestPtr request(mojo::URLRequest::New());
 362   request->url = mojo::String::From(url.spec());
 363   application_manager_.ConnectToApplication(
 364       nullptr, request.Pass(), std::string(), GURL(), GetProxy(&services),
 365       exposed_services.Pass(), shell::GetPermissiveCapabilityFilter(),
 366       base::Bind(&Context::OnApplicationEnd, base::Unretained(this), url));
 367 }
 368
 369 void Context::RunCommandLineApplication(const base::Closure& callback) {
 370   DCHECK(app_urls_.empty());
 371   DCHECK(app_complete_callback_.is_null());
 372   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 373   base::CommandLine::StringVector args = command_line->GetArgs();
 374   for (size_t i = 0; i < args.size(); ++i) {
 375     GURL possible_app(args[i]);
 376     if (possible_app.SchemeIs("mojo")) {
 377       Run(possible_app);
 378       app_complete_callback_ = callback;
 379       break;
 380     }
 381   }
 382 }
 383
 384 void Context::OnApplicationEnd(const GURL& url) {
 385   if (app_urls_.find(url) != app_urls_.end()) {
 386     app_urls_.erase(url);
 387     if (app_urls_.empty() && base::MessageLoop::current()->is_running()) {
 388       DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 389                 task_runners_->shell_runner());
 390       if (app_complete_callback_.is_null()) {
 391         base::MessageLoop::current()->Quit();
 392       } else {
 393         app_complete_callback_.Run();
 394       }
 395     }
 396   }
 397 }
 398
 399 }  // namespace runner
 400 }  // namespace mojo