Get mojo_shell building inside chromium checkout.

mojo/shell/application_manager/application_manager.cc

+// Copyright 2014 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 "mojo/shell/application_manager/application_manager.h"
+
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/stl_util.h"
+#include "base/strings/string_util.h"
+#include "base/trace_event/trace_event.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/error_handler.h"
+#include "mojo/shell/application_manager/fetcher.h"
+#include "mojo/shell/application_manager/local_fetcher.h"
+#include "mojo/shell/application_manager/network_fetcher.h"
+#include "mojo/shell/application_manager/query_util.h"
+#include "mojo/shell/application_manager/shell_impl.h"
+#include "mojo/shell/switches.h"
+#include "third_party/mojo_services/src/content_handler/public/interfaces/content_handler.mojom.h"
+
+namespace mojo {
+namespace shell {
+
+namespace {
+
+// Used by TestAPI.
+bool has_created_instance = false;
+
+std::vector<std::string> Concatenate(const std::vector<std::string>& v1,
+                                     const std::vector<std::string>& v2) {
+  if (!v1.size())
+    return v2;
+  if (!v2.size())
+    return v1;
+  std::vector<std::string> result(v1);
+  result.insert(result.end(), v1.begin(), v1.end());
+  return result;
+}
+
+}  // namespace
+
+ApplicationManager::Delegate::~Delegate() {
+}
+
+GURL ApplicationManager::Delegate::ResolveURL(const GURL& url) {
+  return url;
+}
+
+GURL ApplicationManager::Delegate::ResolveMappings(const GURL& url) {
+  return url;
+}
+
+class ApplicationManager::ContentHandlerConnection : public ErrorHandler {
+ public:
+  ContentHandlerConnection(ApplicationManager* manager,
+                           const GURL& content_handler_url)
+      : manager_(manager), content_handler_url_(content_handler_url) {
+    ServiceProviderPtr services;
+    manager->ConnectToApplication(content_handler_url, GURL(),
+                                  GetProxy(&services), nullptr,
+                                  base::Closure());
+    MessagePipe pipe;
+    content_handler_.Bind(pipe.handle0.Pass());
+    services->ConnectToService(ContentHandler::Name_, pipe.handle1.Pass());
+    content_handler_.set_error_handler(this);
+  }
+
+  ContentHandler* content_handler() { return content_handler_.get(); }
+
+  GURL content_handler_url() { return content_handler_url_; }
+
+ private:
+  // ErrorHandler implementation:
+  void OnConnectionError() override { manager_->OnContentHandlerError(this); }
+
+  ApplicationManager* manager_;
+  GURL content_handler_url_;
+  ContentHandlerPtr content_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentHandlerConnection);
+};
+
+// static
+ApplicationManager::TestAPI::TestAPI(ApplicationManager* manager)
+    : manager_(manager) {
+}
+
+ApplicationManager::TestAPI::~TestAPI() {
+}
+
+bool ApplicationManager::TestAPI::HasCreatedInstance() {
+  return has_created_instance;
+}
+
+bool ApplicationManager::TestAPI::HasFactoryForURL(const GURL& url) const {
+  return manager_->identity_to_shell_impl_.find(Identity(url)) !=
+         manager_->identity_to_shell_impl_.end();
+}
+
+ApplicationManager::ApplicationManager(Delegate* delegate)
+    : delegate_(delegate), weak_ptr_factory_(this) {
+}
+
+ApplicationManager::~ApplicationManager() {
+  STLDeleteValues(&url_to_content_handler_);
+  TerminateShellConnections();
+  STLDeleteValues(&url_to_loader_);
+  STLDeleteValues(&scheme_to_loader_);
+}
+
+void ApplicationManager::TerminateShellConnections() {
+  STLDeleteValues(&identity_to_shell_impl_);
+}
+
+void ApplicationManager::ConnectToApplication(
+    const GURL& requested_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services,
+    const base::Closure& on_application_end) {
+  ConnectToApplicationWithParameters(
+      requested_url, requestor_url, services.Pass(), exposed_services.Pass(),
+      on_application_end, std::vector<std::string>());
+}
+
+void ApplicationManager::ConnectToApplicationWithParameters(
+    const GURL& requested_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services,
+    const base::Closure& on_application_end,
+    const std::vector<std::string>& pre_redirect_parameters) {
+  TRACE_EVENT_INSTANT1(
+      "mojo_shell", "ApplicationManager::ConnectToApplicationWithParameters",
+      TRACE_EVENT_SCOPE_THREAD, "requested_url", requested_url.spec());
+  DCHECK(requested_url.is_valid());
+
+  // We check both the mapped and resolved urls for existing shell_impls because
+  // external applications can be registered for the unresolved mojo:foo urls.
+
+  GURL mapped_url = delegate_->ResolveMappings(requested_url);
+  if (ConnectToRunningApplication(mapped_url, requestor_url, &services,
+                                  &exposed_services)) {
+    return;
+  }
+
+  GURL resolved_url = delegate_->ResolveURL(mapped_url);
+  if (ConnectToRunningApplication(resolved_url, requestor_url, &services,
+                                  &exposed_services)) {
+    return;
+  }
+
+  // The application is not running, let's compute the parameters.
+  std::vector<std::string> parameters =
+      Concatenate(pre_redirect_parameters, GetArgsForURL(resolved_url));
+
+  if (ConnectToApplicationWithLoader(mapped_url, requestor_url, &services,
+                                     &exposed_services, on_application_end,
+                                     parameters, GetLoaderForURL(mapped_url))) {
+    return;
+  }
+
+  if (ConnectToApplicationWithLoader(
+          resolved_url, requestor_url, &services, &exposed_services,
+          on_application_end, parameters, GetLoaderForURL(resolved_url))) {
+    return;
+  }
+
+  if (ConnectToApplicationWithLoader(resolved_url, requestor_url, &services,
+                                     &exposed_services, on_application_end,
+                                     parameters, default_loader_.get())) {
+    return;
+  }
+
+  auto callback = base::Bind(
+      &ApplicationManager::HandleFetchCallback, weak_ptr_factory_.GetWeakPtr(),
+      requestor_url, base::Passed(services.Pass()),
+      base::Passed(exposed_services.Pass()), on_application_end,
+      parameters);
+
+  if (resolved_url.SchemeIsFile()) {
+    new LocalFetcher(
+        resolved_url, GetBaseURLAndQuery(resolved_url, nullptr),
+        base::Bind(callback, NativeApplicationCleanup::DONT_DELETE));
+    return;
+  }
+
+  if (!network_service_)
+    ConnectToService(GURL("mojo:network_service"), &network_service_);
+
+  const NativeApplicationCleanup cleanup =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDontDeleteOnDownload)
+          ? NativeApplicationCleanup::DONT_DELETE
+          : NativeApplicationCleanup::DELETE;
+
+  new NetworkFetcher(disable_cache_, resolved_url, network_service_.get(),
+                     base::Bind(callback, cleanup));
+}
+
+bool ApplicationManager::ConnectToRunningApplication(
+    const GURL& resolved_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider>* services,
+    ServiceProviderPtr* exposed_services) {
+  GURL application_url = GetBaseURLAndQuery(resolved_url, nullptr);
+  ShellImpl* shell_impl = GetShellImpl(application_url);
+  if (!shell_impl)
+    return false;
+
+  ConnectToClient(shell_impl, resolved_url, requestor_url, services->Pass(),
+                  exposed_services->Pass());
+  return true;
+}
+
+bool ApplicationManager::ConnectToApplicationWithLoader(
+    const GURL& resolved_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider>* services,
+    ServiceProviderPtr* exposed_services,
+    const base::Closure& on_application_end,
+    const std::vector<std::string>& parameters,
+    ApplicationLoader* loader) {
+  if (!loader)
+    return false;
+
+  loader->Load(
+      resolved_url,
+      RegisterShell(resolved_url, requestor_url, services->Pass(),
+                    exposed_services->Pass(), on_application_end, parameters));
+  return true;
+}
+
+InterfaceRequest<Application> ApplicationManager::RegisterShell(
+    const GURL& resolved_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services,
+    const base::Closure& on_application_end,
+    const std::vector<std::string>& parameters) {
+  Identity app_identity(resolved_url);
+
+  ApplicationPtr application;
+  InterfaceRequest<Application> application_request = GetProxy(&application);
+  ShellImpl* shell =
+      new ShellImpl(application.Pass(), this, app_identity, on_application_end);
+  identity_to_shell_impl_[app_identity] = shell;
+  shell->InitializeApplication(Array<String>::From(parameters));
+  ConnectToClient(shell, resolved_url, requestor_url, services.Pass(),
+                  exposed_services.Pass());
+  return application_request.Pass();
+}
+
+ShellImpl* ApplicationManager::GetShellImpl(const GURL& url) {
+  const auto& shell_it = identity_to_shell_impl_.find(Identity(url));
+  if (shell_it != identity_to_shell_impl_.end())
+    return shell_it->second;
+  return nullptr;
+}
+
+void ApplicationManager::ConnectToClient(
+    ShellImpl* shell_impl,
+    const GURL& resolved_url,
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services) {
+  shell_impl->ConnectToClient(resolved_url, requestor_url, services.Pass(),
+                              exposed_services.Pass());
+}
+
+void ApplicationManager::HandleFetchCallback(
+    const GURL& requestor_url,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services,
+    const base::Closure& on_application_end,
+    const std::vector<std::string>& parameters,
+    NativeApplicationCleanup cleanup,
+    scoped_ptr<Fetcher> fetcher) {
+  if (!fetcher) {
+    // Network error. Drop |application_request| to tell requestor.
+    return;
+  }
+
+  GURL redirect_url = fetcher->GetRedirectURL();
+  if (!redirect_url.is_empty()) {
+    // And around we go again... Whee!
+    ConnectToApplicationWithParameters(redirect_url, requestor_url,
+                                       services.Pass(), exposed_services.Pass(),
+                                       on_application_end, parameters);
+    return;
+  }
+
+  // We already checked if the application was running before we fetched it, but
+  // it might have started while the fetch was outstanding. We don't want to
+  // have two copies of the app running, so check again.
+  //
+  // Also, it's possible the original URL was redirected to an app that is
+  // already running.
+  if (ConnectToRunningApplication(fetcher->GetURL(), requestor_url, &services,
+                                  &exposed_services)) {
+    return;
+  }
+
+  InterfaceRequest<Application> request(
+      RegisterShell(fetcher->GetURL(), requestor_url, services.Pass(),
+                    exposed_services.Pass(), on_application_end, parameters));
+
+  // If the response begins with a #!mojo <content-handler-url>, use it.
+  GURL content_handler_url;
+  std::string shebang;
+  if (fetcher->PeekContentHandler(&shebang, &content_handler_url)) {
+    LoadWithContentHandler(
+        content_handler_url, request.Pass(),
+        fetcher->AsURLResponse(blocking_pool_,
+                               static_cast<int>(shebang.size())));
+    return;
+  }
+
+  MimeTypeToURLMap::iterator iter = mime_type_to_url_.find(fetcher->MimeType());
+  if (iter != mime_type_to_url_.end()) {
+    LoadWithContentHandler(iter->second, request.Pass(),
+                           fetcher->AsURLResponse(blocking_pool_, 0));
+    return;
+  }
+
+  // TODO(aa): Sanity check that the thing we got looks vaguely like a mojo
+  // application. That could either mean looking for the platform-specific dll
+  // header, or looking for some specific mojo signature prepended to the
+  // library.
+  // TODO(vtl): (Maybe this should be done by the factory/runner?)
+
+  GURL base_resolved_url = GetBaseURLAndQuery(fetcher->GetURL(), nullptr);
+  NativeRunnerFactory::Options options;
+  if (url_to_native_options_.find(base_resolved_url) !=
+      url_to_native_options_.end()) {
+    DVLOG(2) << "Applying stored native options to resolved URL "
+             << fetcher->GetURL();
+    options = url_to_native_options_[base_resolved_url];
+  }
+
+  fetcher->AsPath(
+      blocking_pool_,
+      base::Bind(&ApplicationManager::RunNativeApplication,
+                 weak_ptr_factory_.GetWeakPtr(), base::Passed(request.Pass()),
+                 options, cleanup, base::Passed(fetcher.Pass())));
+}
+
+void ApplicationManager::RunNativeApplication(
+    InterfaceRequest<Application> application_request,
+    const NativeRunnerFactory::Options& options,
+    NativeApplicationCleanup cleanup,
+    scoped_ptr<Fetcher> fetcher,
+    const base::FilePath& path,
+    bool path_exists) {
+  // We only passed fetcher to keep it alive. Done with it now.
+  fetcher.reset();
+
+  DCHECK(application_request.is_pending());
+
+  if (!path_exists) {
+    LOG(ERROR) << "Library not started because library path '" << path.value()
+               << "' does not exist.";
+    return;
+  }
+
+  TRACE_EVENT1("mojo_shell", "ApplicationManager::RunNativeApplication", "path",
+               path.AsUTF8Unsafe());
+  NativeRunner* runner = native_runner_factory_->Create(options).release();
+  native_runners_.push_back(runner);
+  runner->Start(path, cleanup, application_request.Pass(),
+                base::Bind(&ApplicationManager::CleanupRunner,
+                           weak_ptr_factory_.GetWeakPtr(), runner));
+}
+
+void ApplicationManager::RegisterExternalApplication(
+    const GURL& url,
+    const std::vector<std::string>& args,
+    ApplicationPtr application) {
+  const auto& args_it = url_to_args_.find(url);
+  if (args_it != url_to_args_.end()) {
+    LOG(WARNING) << "--args-for provided for external application " << url
+                 << " <ignored>";
+  }
+  Identity identity(url);
+  ShellImpl* shell_impl =
+      new ShellImpl(application.Pass(), this, identity, base::Closure());
+  identity_to_shell_impl_[identity] = shell_impl;
+  shell_impl->InitializeApplication(Array<String>::From(args));
+}
+
+void ApplicationManager::RegisterContentHandler(
+    const std::string& mime_type,
+    const GURL& content_handler_url) {
+  DCHECK(content_handler_url.is_valid())
+      << "Content handler URL is invalid for mime type " << mime_type;
+  mime_type_to_url_[mime_type] = content_handler_url;
+}
+
+void ApplicationManager::LoadWithContentHandler(
+    const GURL& content_handler_url,
+    InterfaceRequest<Application> application_request,
+    URLResponsePtr url_response) {
+  ContentHandlerConnection* connection = nullptr;
+  URLToContentHandlerMap::iterator iter =
+      url_to_content_handler_.find(content_handler_url);
+  if (iter != url_to_content_handler_.end()) {
+    connection = iter->second;
+  } else {
+    connection = new ContentHandlerConnection(this, content_handler_url);
+    url_to_content_handler_[content_handler_url] = connection;
+  }
+
+  connection->content_handler()->StartApplication(application_request.Pass(),
+                                                  url_response.Pass());
+}
+
+void ApplicationManager::SetLoaderForURL(scoped_ptr<ApplicationLoader> loader,
+                                         const GURL& url) {
+  URLToLoaderMap::iterator it = url_to_loader_.find(url);
+  if (it != url_to_loader_.end())
+    delete it->second;
+  url_to_loader_[url] = loader.release();
+}
+
+void ApplicationManager::SetLoaderForScheme(
+    scoped_ptr<ApplicationLoader> loader,
+    const std::string& scheme) {
+  SchemeToLoaderMap::iterator it = scheme_to_loader_.find(scheme);
+  if (it != scheme_to_loader_.end())
+    delete it->second;
+  scheme_to_loader_[scheme] = loader.release();
+}
+
+void ApplicationManager::SetArgsForURL(const std::vector<std::string>& args,
+                                       const GURL& url) {
+  url_to_args_[url].insert(url_to_args_[url].end(), args.begin(), args.end());
+  GURL mapped_url = delegate_->ResolveMappings(url);
+  if (mapped_url != url) {
+    url_to_args_[mapped_url].insert(url_to_args_[mapped_url].end(),
+                                    args.begin(), args.end());
+  }
+  GURL resolved_url = delegate_->ResolveURL(mapped_url);
+  if (resolved_url != mapped_url) {
+    url_to_args_[resolved_url].insert(url_to_args_[resolved_url].end(),
+                                      args.begin(), args.end());
+  }
+}
+
+void ApplicationManager::SetNativeOptionsForURL(
+    const NativeRunnerFactory::Options& options,
+    const GURL& url) {
+  DCHECK(!url.has_query());  // Precondition.
+  // Apply mappings and resolution to get the resolved URL.
+  GURL resolved_url = delegate_->ResolveURL(delegate_->ResolveMappings(url));
+  DCHECK(!resolved_url.has_query());  // Still shouldn't have query.
+  // TODO(vtl): We should probably also remove/disregard the query string (and
+  // maybe canonicalize in other ways).
+  DVLOG(2) << "Storing native options for resolved URL " << resolved_url
+           << " (original URL " << url << ")";
+  url_to_native_options_[resolved_url] = options;
+}
+
+ApplicationLoader* ApplicationManager::GetLoaderForURL(const GURL& url) {
+  auto url_it = url_to_loader_.find(GetBaseURLAndQuery(url, nullptr));
+  if (url_it != url_to_loader_.end())
+    return url_it->second;
+  auto scheme_it = scheme_to_loader_.find(url.scheme());
+  if (scheme_it != scheme_to_loader_.end())
+    return scheme_it->second;
+  return nullptr;
+}
+
+void ApplicationManager::OnShellImplError(ShellImpl* shell_impl) {
+  // Called from ~ShellImpl, so we do not need to call Destroy here.
+  const Identity identity = shell_impl->identity();
+  base::Closure on_application_end = shell_impl->on_application_end();
+  // Remove the shell.
+  auto it = identity_to_shell_impl_.find(identity);
+  DCHECK(it != identity_to_shell_impl_.end());
+  delete it->second;
+  identity_to_shell_impl_.erase(it);
+  if (!on_application_end.is_null())
+    on_application_end.Run();
+}
+
+void ApplicationManager::OnContentHandlerError(
+    ContentHandlerConnection* content_handler) {
+  // Remove the mapping to the content handler.
+  auto it =
+      url_to_content_handler_.find(content_handler->content_handler_url());
+  DCHECK(it != url_to_content_handler_.end());
+  delete it->second;
+  url_to_content_handler_.erase(it);
+}
+
+ScopedMessagePipeHandle ApplicationManager::ConnectToServiceByName(
+    const GURL& application_url,
+    const std::string& interface_name) {
+  ServiceProviderPtr services;
+  ConnectToApplication(application_url, GURL(), GetProxy(&services), nullptr,
+                       base::Closure());
+  MessagePipe pipe;
+  services->ConnectToService(interface_name, pipe.handle1.Pass());
+  return pipe.handle0.Pass();
+}
+
+std::vector<std::string> ApplicationManager::GetArgsForURL(const GURL& url) {
+  const auto& args_it = url_to_args_.find(url);
+  if (args_it != url_to_args_.end())
+    return args_it->second;
+  return std::vector<std::string>();
+}
+
+void ApplicationManager::CleanupRunner(NativeRunner* runner) {
+  native_runners_.erase(
+      std::find(native_runners_.begin(), native_runners_.end(), runner));
+}
+
+}  // namespace shell
+}  // namespace mojo