mojo/runner/android/android_handler.cc

   1 // Copyright 2014 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/android/android_handler.h"
   6
   7 #include "base/android/jni_android.h"
   8 #include "base/android/jni_string.h"
   9 #include "base/files/file_path.h"
  10 #include "base/logging.h"
  11 #include "base/scoped_native_library.h"
  12 #include "jni/AndroidHandler_jni.h"
  13 #include "mojo/application/public/cpp/application_impl.h"
  14 #include "mojo/common/data_pipe_utils.h"
  15 #include "mojo/public/c/system/main.h"
  16 #include "mojo/runner/android/run_android_application_function.h"
  17 #include "mojo/runner/native_application_support.h"
  18 #include "mojo/util/filename_util.h"
  19 #include "url/gurl.h"
  20
  21 using base::android::AttachCurrentThread;
  22 using base::android::ScopedJavaLocalRef;
  23 using base::android::ConvertJavaStringToUTF8;
  24 using base::android::ConvertUTF8ToJavaString;
  25 using base::android::GetApplicationContext;
  26
  27 namespace mojo {
  28 namespace runner {
  29
  30 namespace {
  31
  32 // This function loads the application library, sets the application context and
  33 // thunks and calls into the application MojoMain. To ensure that the thunks are
  34 // set correctly we keep it in the Mojo shell .so and pass the function pointer
  35 // to the helper libbootstrap.so.
  36 void RunAndroidApplication(JNIEnv* env,
  37                            jobject j_context,
  38                            const base::FilePath& app_path,
  39                            jint j_handle,
  40                            bool is_cached_app) {
  41   InterfaceRequest<Application> application_request =
  42       MakeRequest<Application>(MakeScopedHandle(MessagePipeHandle(j_handle)));
  43
  44   // Load the library, so that we can set the application context there if
  45   // needed.
  46   // TODO(vtl): We'd use a ScopedNativeLibrary, but it doesn't have .get()!
  47   base::NativeLibrary app_library = LoadNativeApplication(
  48       app_path, is_cached_app ? shell::NativeApplicationCleanup::DONT_DELETE
  49                               : shell::NativeApplicationCleanup::DELETE);
  50   if (!app_library)
  51     return;
  52
  53   // Set the application context if needed. Most applications will need to
  54   // access the Android ApplicationContext in which they are run. If the
  55   // application library exports the InitApplicationContext function, we will
  56   // set it there.
  57   const char* init_application_context_name = "InitApplicationContext";
  58   typedef void (*InitApplicationContextFn)(
  59       const base::android::JavaRef<jobject>&);
  60   InitApplicationContextFn init_application_context =
  61       reinterpret_cast<InitApplicationContextFn>(
  62           base::GetFunctionPointerFromNativeLibrary(
  63               app_library, init_application_context_name));
  64   if (init_application_context) {
  65     base::android::ScopedJavaLocalRef<jobject> scoped_context(env, j_context);
  66     init_application_context(scoped_context);
  67   }
  68
  69   // Run the application.
  70   RunNativeApplication(app_library, application_request.Pass());
  71   // TODO(vtl): See note about unloading and thread-local destructors above
  72   // declaration of |LoadNativeApplication()|.
  73   base::UnloadNativeLibrary(app_library);
  74 }
  75
  76 // Returns true if |url| denotes a cached app. If true |app_dir| is set to the
  77 // path of the directory for the app and |path_to_mojo| the path of the app's
  78 // .mojo file.
  79 bool IsCachedApp(JNIEnv* env,
  80                  const GURL& url,
  81                  base::FilePath* app_dir,
  82                  base::FilePath* path_to_mojo) {
  83   ScopedJavaLocalRef<jstring> j_cached_apps_dir =
  84       Java_AndroidHandler_getCachedAppsDir(env, GetApplicationContext());
  85   const base::FilePath cached_apps_fp(
  86       ConvertJavaStringToUTF8(env, j_cached_apps_dir.obj()));
  87   const std::string cached_apps(util::FilePathToFileURL(cached_apps_fp).spec());
  88   const std::string response_url(GURL(url).spec());
  89   if (response_url.size() <= cached_apps.size() ||
  90       cached_apps.compare(0u, cached_apps.size(), response_url, 0u,
  91                           cached_apps.size()) != 0) {
  92     return false;
  93   }
  94
  95   const std::string mojo_suffix(".mojo");
  96   // app_rel_path is either something like html_viewer/html_viewer.mojo, or
  97   // html_viewer.mojo, depending upon whether the app has a package.
  98   const std::string app_rel_path(response_url.substr(cached_apps.size() + 1));
  99   const size_t slash_index = app_rel_path.find('/');
 100   if (slash_index != std::string::npos) {
 101     const std::string tail =
 102         app_rel_path.substr(slash_index + 1, std::string::npos);
 103     const std::string head = app_rel_path.substr(0, slash_index);
 104     if (head.find('/') != std::string::npos ||
 105         tail.size() <= mojo_suffix.size() ||
 106         tail.compare(tail.size() - mojo_suffix.size(), tail.size(),
 107                      mojo_suffix) != 0) {
 108       return false;
 109     }
 110     *app_dir = cached_apps_fp.Append(head);
 111     *path_to_mojo = app_dir->Append(tail);
 112     return true;
 113   }
 114   if (app_rel_path.find('/') != std::string::npos ||
 115       app_rel_path.size() <= mojo_suffix.size() ||
 116       app_rel_path.compare(app_rel_path.size() - mojo_suffix.size(),
 117                            mojo_suffix.size(), mojo_suffix) != 0) {
 118     return false;
 119   }
 120
 121   *app_dir = cached_apps_fp.Append(
 122       app_rel_path.substr(0, app_rel_path.size() - mojo_suffix.size()));
 123   *path_to_mojo = cached_apps_fp.Append(app_rel_path);
 124   return true;
 125 }
 126
 127 }  // namespace
 128
 129 AndroidHandler::AndroidHandler() : content_handler_factory_(this) {
 130 }
 131
 132 AndroidHandler::~AndroidHandler() {
 133 }
 134
 135 void AndroidHandler::RunApplication(
 136     InterfaceRequest<Application> application_request,
 137     URLResponsePtr response) {
 138   JNIEnv* env = AttachCurrentThread();
 139   RunAndroidApplicationFn run_android_application_fn = &RunAndroidApplication;
 140   if (!response->url.is_null()) {
 141     base::FilePath internal_app_path;
 142     base::FilePath path_to_mojo;
 143     if (IsCachedApp(env, GURL(response->url), &internal_app_path,
 144                     &path_to_mojo)) {
 145       ScopedJavaLocalRef<jstring> j_internal_app_path(
 146           ConvertUTF8ToJavaString(env, internal_app_path.value()));
 147       ScopedJavaLocalRef<jstring> j_path_to_mojo(
 148           ConvertUTF8ToJavaString(env, path_to_mojo.value()));
 149       Java_AndroidHandler_bootstrapCachedApp(
 150           env, GetApplicationContext(), j_path_to_mojo.obj(),
 151           j_internal_app_path.obj(),
 152           application_request.PassMessagePipe().release().value(),
 153           reinterpret_cast<jlong>(run_android_application_fn));
 154       return;
 155     }
 156   }
 157   ScopedJavaLocalRef<jstring> j_archive_path =
 158       Java_AndroidHandler_getNewTempArchivePath(env, GetApplicationContext());
 159   base::FilePath archive_path(
 160       ConvertJavaStringToUTF8(env, j_archive_path.obj()));
 161
 162   common::BlockingCopyToFile(response->body.Pass(), archive_path);
 163   Java_AndroidHandler_bootstrap(
 164       env, GetApplicationContext(), j_archive_path.obj(),
 165       application_request.PassMessagePipe().release().value(),
 166       reinterpret_cast<jlong>(run_android_application_fn));
 167 }
 168
 169 void AndroidHandler::Initialize(ApplicationImpl* app) {
 170 }
 171
 172 bool AndroidHandler::ConfigureIncomingConnection(
 173     ApplicationConnection* connection) {
 174   connection->AddService(&content_handler_factory_);
 175   return true;
 176 }
 177
 178 bool RegisterAndroidHandlerJni(JNIEnv* env) {
 179   return RegisterNativesImpl(env);
 180 }
 181
 182 }  // namespace runner
 183 }  // namespace mojo