android_webview/native/android_protocol_handler.cc

   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 #include "android_webview/native/android_protocol_handler.h"
   6
   7 #include "android_webview/browser/net/android_stream_reader_url_request_job.h"
   8 #include "android_webview/browser/net/aw_url_request_job_factory.h"
   9 #include "android_webview/common/url_constants.h"
  10 #include "android_webview/native/input_stream_impl.h"
  11 #include "base/android/jni_android.h"
  12 #include "base/android/jni_string.h"
  13 #include "base/android/jni_weak_ref.h"
  14 #include "base/strings/string_util.h"
  15 #include "content/public/common/url_constants.h"
  16 #include "jni/AndroidProtocolHandler_jni.h"
  17 #include "net/base/io_buffer.h"
  18 #include "net/base/mime_util.h"
  19 #include "net/base/net_errors.h"
  20 #include "net/base/net_util.h"
  21 #include "net/http/http_util.h"
  22 #include "net/url_request/url_request.h"
  23 #include "net/url_request/url_request_interceptor.h"
  24 #include "url/gurl.h"
  25
  26 using android_webview::InputStream;
  27 using android_webview::InputStreamImpl;
  28 using base::android::AttachCurrentThread;
  29 using base::android::ClearException;
  30 using base::android::ConvertUTF8ToJavaString;
  31 using base::android::ScopedJavaGlobalRef;
  32 using base::android::ScopedJavaLocalRef;
  33
  34 namespace {
  35
  36 // Override resource context for reading resource and asset files. Used for
  37 // testing.
  38 JavaObjectWeakGlobalRef* g_resource_context = NULL;
  39
  40 void ResetResourceContext(JavaObjectWeakGlobalRef* ref) {
  41   if (g_resource_context)
  42     delete g_resource_context;
  43
  44   g_resource_context = ref;
  45 }
  46
  47 void* kPreviouslyFailedKey = &kPreviouslyFailedKey;
  48
  49 void MarkRequestAsFailed(net::URLRequest* request) {
  50   request->SetUserData(kPreviouslyFailedKey,
  51                        new base::SupportsUserData::Data());
  52 }
  53
  54 bool HasRequestPreviouslyFailed(net::URLRequest* request) {
  55   return request->GetUserData(kPreviouslyFailedKey) != NULL;
  56 }
  57
  58 class AndroidStreamReaderURLRequestJobDelegateImpl
  59     : public AndroidStreamReaderURLRequestJob::Delegate {
  60  public:
  61   AndroidStreamReaderURLRequestJobDelegateImpl();
  62
  63   scoped_ptr<InputStream> OpenInputStream(JNIEnv* env,
  64                                           const GURL& url) override;
  65
  66   void OnInputStreamOpenFailed(net::URLRequest* request,
  67                                bool* restart) override;
  68
  69   bool GetMimeType(JNIEnv* env,
  70                    net::URLRequest* request,
  71                    InputStream* stream,
  72                    std::string* mime_type) override;
  73
  74   bool GetCharset(JNIEnv* env,
  75                   net::URLRequest* request,
  76                   InputStream* stream,
  77                   std::string* charset) override;
  78
  79   void AppendResponseHeaders(JNIEnv* env,
  80                              net::HttpResponseHeaders* headers) override;
  81
  82   ~AndroidStreamReaderURLRequestJobDelegateImpl() override;
  83 };
  84
  85 class AndroidRequestInterceptorBase : public net::URLRequestInterceptor {
  86  public:
  87   net::URLRequestJob* MaybeInterceptRequest(
  88       net::URLRequest* request,
  89       net::NetworkDelegate* network_delegate) const override;
  90
  91   virtual bool ShouldHandleRequest(const net::URLRequest* request) const = 0;
  92 };
  93
  94 class AssetFileRequestInterceptor : public AndroidRequestInterceptorBase {
  95  public:
  96   AssetFileRequestInterceptor();
  97
  98   ~AssetFileRequestInterceptor() override;
  99   bool ShouldHandleRequest(const net::URLRequest* request) const override;
 100
 101  private:
 102   // file:///android_asset/
 103   const std::string asset_prefix_;
 104   // file:///android_res/
 105   const std::string resource_prefix_;
 106 };
 107
 108 // Protocol handler for content:// scheme requests.
 109 class ContentSchemeRequestInterceptor : public AndroidRequestInterceptorBase {
 110  public:
 111   ContentSchemeRequestInterceptor();
 112   bool ShouldHandleRequest(const net::URLRequest* request) const override;
 113 };
 114
 115 static ScopedJavaLocalRef<jobject> GetResourceContext(JNIEnv* env) {
 116   if (g_resource_context)
 117     return g_resource_context->get(env);
 118   ScopedJavaLocalRef<jobject> context;
 119   // We have to reset as GetApplicationContext() returns a jobject with a
 120   // global ref. The constructor that takes a jobject would expect a local ref
 121   // and would assert.
 122   context.Reset(env, base::android::GetApplicationContext());
 123   return context;
 124 }
 125
 126 // AndroidStreamReaderURLRequestJobDelegateImpl -------------------------------
 127
 128 AndroidStreamReaderURLRequestJobDelegateImpl::
 129     AndroidStreamReaderURLRequestJobDelegateImpl() {}
 130
 131 AndroidStreamReaderURLRequestJobDelegateImpl::
 132 ~AndroidStreamReaderURLRequestJobDelegateImpl() {
 133 }
 134
 135 scoped_ptr<InputStream>
 136 AndroidStreamReaderURLRequestJobDelegateImpl::OpenInputStream(
 137     JNIEnv* env, const GURL& url) {
 138   DCHECK(url.is_valid());
 139   DCHECK(env);
 140
 141   // Open the input stream.
 142   ScopedJavaLocalRef<jstring> jurl =
 143       ConvertUTF8ToJavaString(env, url.spec());
 144   ScopedJavaLocalRef<jobject> stream =
 145       android_webview::Java_AndroidProtocolHandler_open(
 146           env,
 147           GetResourceContext(env).obj(),
 148           jurl.obj());
 149
 150   if (stream.is_null()) {
 151     DLOG(ERROR) << "Unable to open input stream for Android URL";
 152     return scoped_ptr<InputStream>();
 153   }
 154   return make_scoped_ptr<InputStream>(new InputStreamImpl(stream));
 155 }
 156
 157 void AndroidStreamReaderURLRequestJobDelegateImpl::OnInputStreamOpenFailed(
 158     net::URLRequest* request,
 159     bool* restart) {
 160   DCHECK(!HasRequestPreviouslyFailed(request));
 161   MarkRequestAsFailed(request);
 162   *restart = true;
 163 }
 164
 165 bool AndroidStreamReaderURLRequestJobDelegateImpl::GetMimeType(
 166     JNIEnv* env,
 167     net::URLRequest* request,
 168     android_webview::InputStream* stream,
 169     std::string* mime_type) {
 170   DCHECK(env);
 171   DCHECK(request);
 172   DCHECK(mime_type);
 173
 174   // Query the mime type from the Java side. It is possible for the query to
 175   // fail, as the mime type cannot be determined for all supported schemes.
 176   ScopedJavaLocalRef<jstring> url =
 177       ConvertUTF8ToJavaString(env, request->url().spec());
 178   const InputStreamImpl* stream_impl =
 179       InputStreamImpl::FromInputStream(stream);
 180   ScopedJavaLocalRef<jstring> returned_type =
 181       android_webview::Java_AndroidProtocolHandler_getMimeType(
 182           env,
 183           GetResourceContext(env).obj(),
 184           stream_impl->jobj(), url.obj());
 185   if (returned_type.is_null())
 186     return false;
 187
 188   *mime_type = base::android::ConvertJavaStringToUTF8(returned_type);
 189   return true;
 190 }
 191
 192 bool AndroidStreamReaderURLRequestJobDelegateImpl::GetCharset(
 193     JNIEnv* env,
 194     net::URLRequest* request,
 195     android_webview::InputStream* stream,
 196     std::string* charset) {
 197   // TODO: We should probably be getting this from the managed side.
 198   return false;
 199 }
 200
 201 void AndroidStreamReaderURLRequestJobDelegateImpl::AppendResponseHeaders(
 202     JNIEnv* env,
 203     net::HttpResponseHeaders* headers) {
 204   // no-op
 205 }
 206
 207 // AndroidRequestInterceptorBase ----------------------------------------------
 208
 209 net::URLRequestJob* AndroidRequestInterceptorBase::MaybeInterceptRequest(
 210     net::URLRequest* request,
 211     net::NetworkDelegate* network_delegate) const {
 212   if (!ShouldHandleRequest(request))
 213     return NULL;
 214
 215   // For WebViewClassic compatibility this job can only accept URLs that can be
 216   // opened. URLs that cannot be opened should be resolved by the next handler.
 217   //
 218   // If a request is initially handled here but the job fails due to it being
 219   // unable to open the InputStream for that request the request is marked as
 220   // previously failed and restarted.
 221   // Restarting a request involves creating a new job for that request. This
 222   // handler will ignore requests know to have previously failed to 1) prevent
 223   // an infinite loop, 2) ensure that the next handler in line gets the
 224   // opportunity to create a job for the request.
 225   if (HasRequestPreviouslyFailed(request))
 226     return NULL;
 227
 228   scoped_ptr<AndroidStreamReaderURLRequestJobDelegateImpl> reader_delegate(
 229       new AndroidStreamReaderURLRequestJobDelegateImpl());
 230
 231   return new AndroidStreamReaderURLRequestJob(
 232       request, network_delegate, reader_delegate.Pass());
 233 }
 234
 235 // AssetFileRequestInterceptor ------------------------------------------------
 236
 237 AssetFileRequestInterceptor::AssetFileRequestInterceptor()
 238     : asset_prefix_(std::string(url::kFileScheme) +
 239                     std::string(url::kStandardSchemeSeparator) +
 240                     android_webview::kAndroidAssetPath),
 241       resource_prefix_(std::string(url::kFileScheme) +
 242                        std::string(url::kStandardSchemeSeparator) +
 243                        android_webview::kAndroidResourcePath) {
 244 }
 245
 246 AssetFileRequestInterceptor::~AssetFileRequestInterceptor() {
 247 }
 248
 249 bool AssetFileRequestInterceptor::ShouldHandleRequest(
 250     const net::URLRequest* request) const {
 251   if (!request->url().SchemeIsFile())
 252     return false;
 253
 254   const std::string& url = request->url().spec();
 255   if (!StartsWithASCII(url, asset_prefix_, /*case_sensitive=*/ true) &&
 256       !StartsWithASCII(url, resource_prefix_, /*case_sensitive=*/ true)) {
 257     return false;
 258   }
 259
 260   return true;
 261 }
 262
 263 // ContentSchemeRequestInterceptor --------------------------------------------
 264
 265 ContentSchemeRequestInterceptor::ContentSchemeRequestInterceptor() {
 266 }
 267
 268 bool ContentSchemeRequestInterceptor::ShouldHandleRequest(
 269     const net::URLRequest* request) const {
 270   return request->url().SchemeIs(android_webview::kContentScheme);
 271 }
 272
 273 }  // namespace
 274
 275 namespace android_webview {
 276
 277 bool RegisterAndroidProtocolHandler(JNIEnv* env) {
 278   return RegisterNativesImpl(env);
 279 }
 280
 281 // static
 282 scoped_ptr<net::URLRequestInterceptor>
 283 CreateContentSchemeRequestInterceptor() {
 284   return make_scoped_ptr<net::URLRequestInterceptor>(
 285       new ContentSchemeRequestInterceptor());
 286 }
 287
 288 // static
 289 scoped_ptr<net::URLRequestInterceptor> CreateAssetFileRequestInterceptor() {
 290   return scoped_ptr<net::URLRequestInterceptor>(
 291       new AssetFileRequestInterceptor());
 292 }
 293
 294 // Set a context object to be used for resolving resource queries. This can
 295 // be used to override the default application context and redirect all
 296 // resource queries to a specific context object, e.g., for the purposes of
 297 // testing.
 298 //
 299 // |context| should be a android.content.Context instance or NULL to enable
 300 // the use of the standard application context.
 301 static void SetResourceContextForTesting(JNIEnv* env, jclass /*clazz*/,
 302                                          jobject context) {
 303   if (context) {
 304     ResetResourceContext(new JavaObjectWeakGlobalRef(env, context));
 305   } else {
 306     ResetResourceContext(NULL);
 307   }
 308 }
 309
 310 static jstring GetAndroidAssetPath(JNIEnv* env, jclass /*clazz*/) {
 311   // OK to release, JNI binding.
 312   return ConvertUTF8ToJavaString(
 313       env, android_webview::kAndroidAssetPath).Release();
 314 }
 315
 316 static jstring GetAndroidResourcePath(JNIEnv* env, jclass /*clazz*/) {
 317   // OK to release, JNI binding.
 318   return ConvertUTF8ToJavaString(
 319       env, android_webview::kAndroidResourcePath).Release();
 320 }
 321
 322 }  // namespace android_webview