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      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 // An implementation of WebURLLoader in terms of ResourceLoaderBridge.
      6 
      7 #include "webkit/child/weburlloader_impl.h"
      8 
      9 #include "base/bind.h"
     10 #include "base/files/file_path.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "base/strings/string_util.h"
     14 #include "base/time/time.h"
     15 #include "net/base/data_url.h"
     16 #include "net/base/load_flags.h"
     17 #include "net/base/mime_util.h"
     18 #include "net/base/net_errors.h"
     19 #include "net/base/net_util.h"
     20 #include "net/http/http_response_headers.h"
     21 #include "net/http/http_util.h"
     22 #include "third_party/WebKit/public/platform/WebHTTPHeaderVisitor.h"
     23 #include "third_party/WebKit/public/platform/WebHTTPLoadInfo.h"
     24 #include "third_party/WebKit/public/platform/WebURL.h"
     25 #include "third_party/WebKit/public/platform/WebURLError.h"
     26 #include "third_party/WebKit/public/platform/WebURLLoadTiming.h"
     27 #include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
     28 #include "third_party/WebKit/public/platform/WebURLRequest.h"
     29 #include "third_party/WebKit/public/platform/WebURLResponse.h"
     30 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
     31 #include "webkit/child/ftp_directory_listing_response_delegate.h"
     32 #include "webkit/child/multipart_response_delegate.h"
     33 #include "webkit/child/resource_loader_bridge.h"
     34 #include "webkit/child/webkitplatformsupport_impl.h"
     35 #include "webkit/child/weburlrequest_extradata_impl.h"
     36 #include "webkit/child/weburlresponse_extradata_impl.h"
     37 #include "webkit/common/resource_request_body.h"
     38 
     39 using base::Time;
     40 using base::TimeTicks;
     41 using WebKit::WebData;
     42 using WebKit::WebHTTPBody;
     43 using WebKit::WebHTTPHeaderVisitor;
     44 using WebKit::WebHTTPLoadInfo;
     45 using WebKit::WebReferrerPolicy;
     46 using WebKit::WebSecurityPolicy;
     47 using WebKit::WebString;
     48 using WebKit::WebURL;
     49 using WebKit::WebURLError;
     50 using WebKit::WebURLLoadTiming;
     51 using WebKit::WebURLLoader;
     52 using WebKit::WebURLLoaderClient;
     53 using WebKit::WebURLRequest;
     54 using WebKit::WebURLResponse;
     55 
     56 namespace webkit_glue {
     57 
     58 // Utilities ------------------------------------------------------------------
     59 
     60 namespace {
     61 
     62 const char kThrottledErrorDescription[] =
     63     "Request throttled. Visit http://dev.chromium.org/throttling for more "
     64     "information.";
     65 
     66 class HeaderFlattener : public WebHTTPHeaderVisitor {
     67  public:
     68   explicit HeaderFlattener(int load_flags)
     69       : load_flags_(load_flags),
     70         has_accept_header_(false) {
     71   }
     72 
     73   virtual void visitHeader(const WebString& name, const WebString& value) {
     74     // TODO(darin): is UTF-8 really correct here?  It is if the strings are
     75     // already ASCII (i.e., if they are already escaped properly).
     76     const std::string& name_utf8 = name.utf8();
     77     const std::string& value_utf8 = value.utf8();
     78 
     79     // Skip over referrer headers found in the header map because we already
     80     // pulled it out as a separate parameter.
     81     if (LowerCaseEqualsASCII(name_utf8, "referer"))
     82       return;
     83 
     84     // Skip over "Cache-Control: max-age=0" header if the corresponding
     85     // load flag is already specified. FrameLoader sets both the flag and
     86     // the extra header -- the extra header is redundant since our network
     87     // implementation will add the necessary headers based on load flags.
     88     // See http://code.google.com/p/chromium/issues/detail?id=3434.
     89     if ((load_flags_ & net::LOAD_VALIDATE_CACHE) &&
     90         LowerCaseEqualsASCII(name_utf8, "cache-control") &&
     91         LowerCaseEqualsASCII(value_utf8, "max-age=0"))
     92       return;
     93 
     94     if (LowerCaseEqualsASCII(name_utf8, "accept"))
     95       has_accept_header_ = true;
     96 
     97     if (!buffer_.empty())
     98       buffer_.append("\r\n");
     99     buffer_.append(name_utf8 + ": " + value_utf8);
    100   }
    101 
    102   const std::string& GetBuffer() {
    103     // In some cases, WebKit doesn't add an Accept header, but not having the
    104     // header confuses some web servers.  See bug 808613.
    105     if (!has_accept_header_) {
    106       if (!buffer_.empty())
    107         buffer_.append("\r\n");
    108       buffer_.append("Accept: */*");
    109       has_accept_header_ = true;
    110     }
    111     return buffer_;
    112   }
    113 
    114  private:
    115   int load_flags_;
    116   std::string buffer_;
    117   bool has_accept_header_;
    118 };
    119 
    120 // Extracts the information from a data: url.
    121 bool GetInfoFromDataURL(const GURL& url,
    122                         ResourceResponseInfo* info,
    123                         std::string* data,
    124                         int* error_code) {
    125   std::string mime_type;
    126   std::string charset;
    127   if (net::DataURL::Parse(url, &mime_type, &charset, data)) {
    128     *error_code = net::OK;
    129     // Assure same time for all time fields of data: URLs.
    130     Time now = Time::Now();
    131     info->load_timing.request_start = TimeTicks::Now();
    132     info->load_timing.request_start_time = now;
    133     info->request_time = now;
    134     info->response_time = now;
    135     info->headers = NULL;
    136     info->mime_type.swap(mime_type);
    137     info->charset.swap(charset);
    138     info->security_info.clear();
    139     info->content_length = data->length();
    140     info->encoded_data_length = 0;
    141 
    142     return true;
    143   }
    144 
    145   *error_code = net::ERR_INVALID_URL;
    146   return false;
    147 }
    148 
    149 typedef ResourceDevToolsInfo::HeadersVector HeadersVector;
    150 
    151 // Converts timing data from |load_timing| to the format used by WebKit.
    152 void PopulateURLLoadTiming(const net::LoadTimingInfo& load_timing,
    153                            WebURLLoadTiming* url_timing) {
    154   DCHECK(!load_timing.request_start.is_null());
    155 
    156   const TimeTicks kNullTicks;
    157   url_timing->initialize();
    158   url_timing->setRequestTime(
    159       (load_timing.request_start - kNullTicks).InSecondsF());
    160   url_timing->setProxyStart(
    161       (load_timing.proxy_resolve_start - kNullTicks).InSecondsF());
    162   url_timing->setProxyEnd(
    163       (load_timing.proxy_resolve_end - kNullTicks).InSecondsF());
    164   url_timing->setDNSStart(
    165       (load_timing.connect_timing.dns_start - kNullTicks).InSecondsF());
    166   url_timing->setDNSEnd(
    167       (load_timing.connect_timing.dns_end - kNullTicks).InSecondsF());
    168   url_timing->setConnectStart(
    169       (load_timing.connect_timing.connect_start - kNullTicks).InSecondsF());
    170   url_timing->setConnectEnd(
    171       (load_timing.connect_timing.connect_end - kNullTicks).InSecondsF());
    172   url_timing->setSSLStart(
    173       (load_timing.connect_timing.ssl_start - kNullTicks).InSecondsF());
    174   url_timing->setSSLEnd(
    175       (load_timing.connect_timing.ssl_end - kNullTicks).InSecondsF());
    176   url_timing->setSendStart(
    177       (load_timing.send_start - kNullTicks).InSecondsF());
    178   url_timing->setSendEnd(
    179       (load_timing.send_end - kNullTicks).InSecondsF());
    180   url_timing->setReceiveHeadersEnd(
    181       (load_timing.receive_headers_end - kNullTicks).InSecondsF());
    182 }
    183 
    184 void PopulateURLResponse(
    185     const GURL& url,
    186     const ResourceResponseInfo& info,
    187     WebURLResponse* response) {
    188   response->setURL(url);
    189   response->setResponseTime(info.response_time.ToDoubleT());
    190   response->setMIMEType(WebString::fromUTF8(info.mime_type));
    191   response->setTextEncodingName(WebString::fromUTF8(info.charset));
    192   response->setExpectedContentLength(info.content_length);
    193   response->setSecurityInfo(info.security_info);
    194   response->setAppCacheID(info.appcache_id);
    195   response->setAppCacheManifestURL(info.appcache_manifest_url);
    196   response->setWasCached(!info.load_timing.request_start_time.is_null() &&
    197       info.response_time < info.load_timing.request_start_time);
    198   response->setRemoteIPAddress(
    199       WebString::fromUTF8(info.socket_address.host()));
    200   response->setRemotePort(info.socket_address.port());
    201   response->setConnectionID(info.load_timing.socket_log_id);
    202   response->setConnectionReused(info.load_timing.socket_reused);
    203   response->setDownloadFilePath(info.download_file_path.AsUTF16Unsafe());
    204   WebURLResponseExtraDataImpl* extra_data =
    205       new WebURLResponseExtraDataImpl(info.npn_negotiated_protocol);
    206   response->setExtraData(extra_data);
    207   extra_data->set_was_fetched_via_spdy(info.was_fetched_via_spdy);
    208   extra_data->set_was_npn_negotiated(info.was_npn_negotiated);
    209   extra_data->set_was_alternate_protocol_available(
    210       info.was_alternate_protocol_available);
    211   extra_data->set_connection_info(info.connection_info);
    212   extra_data->set_was_fetched_via_proxy(info.was_fetched_via_proxy);
    213 
    214   // If there's no received headers end time, don't set load timing.  This is
    215   // the case for non-HTTP requests, requests that don't go over the wire, and
    216   // certain error cases.
    217   if (!info.load_timing.receive_headers_end.is_null()) {
    218     WebURLLoadTiming timing;
    219     PopulateURLLoadTiming(info.load_timing, &timing);
    220     response->setLoadTiming(timing);
    221   }
    222 
    223   if (info.devtools_info.get()) {
    224     WebHTTPLoadInfo load_info;
    225 
    226     load_info.setHTTPStatusCode(info.devtools_info->http_status_code);
    227     load_info.setHTTPStatusText(WebString::fromUTF8(
    228         info.devtools_info->http_status_text));
    229     load_info.setEncodedDataLength(info.encoded_data_length);
    230 
    231     load_info.setRequestHeadersText(WebString::fromUTF8(
    232         info.devtools_info->request_headers_text));
    233     load_info.setResponseHeadersText(WebString::fromUTF8(
    234         info.devtools_info->response_headers_text));
    235     const HeadersVector& request_headers = info.devtools_info->request_headers;
    236     for (HeadersVector::const_iterator it = request_headers.begin();
    237          it != request_headers.end(); ++it) {
    238       load_info.addRequestHeader(WebString::fromUTF8(it->first),
    239           WebString::fromUTF8(it->second));
    240     }
    241     const HeadersVector& response_headers =
    242         info.devtools_info->response_headers;
    243     for (HeadersVector::const_iterator it = response_headers.begin();
    244          it != response_headers.end(); ++it) {
    245       load_info.addResponseHeader(WebString::fromUTF8(it->first),
    246           WebString::fromUTF8(it->second));
    247     }
    248     response->setHTTPLoadInfo(load_info);
    249   }
    250 
    251   const net::HttpResponseHeaders* headers = info.headers.get();
    252   if (!headers)
    253     return;
    254 
    255   WebURLResponse::HTTPVersion version = WebURLResponse::Unknown;
    256   if (headers->GetHttpVersion() == net::HttpVersion(0, 9))
    257     version = WebURLResponse::HTTP_0_9;
    258   else if (headers->GetHttpVersion() == net::HttpVersion(1, 0))
    259     version = WebURLResponse::HTTP_1_0;
    260   else if (headers->GetHttpVersion() == net::HttpVersion(1, 1))
    261     version = WebURLResponse::HTTP_1_1;
    262   response->setHTTPVersion(version);
    263   response->setHTTPStatusCode(headers->response_code());
    264   response->setHTTPStatusText(WebString::fromUTF8(headers->GetStatusText()));
    265 
    266   // TODO(darin): We should leverage HttpResponseHeaders for this, and this
    267   // should be using the same code as ResourceDispatcherHost.
    268   // TODO(jungshik): Figure out the actual value of the referrer charset and
    269   // pass it to GetSuggestedFilename.
    270   std::string value;
    271   headers->EnumerateHeader(NULL, "content-disposition", &value);
    272   response->setSuggestedFileName(
    273       net::GetSuggestedFilename(url,
    274                                 value,
    275                                 std::string(),  // referrer_charset
    276                                 std::string(),  // suggested_name
    277                                 std::string(),  // mime_type
    278                                 std::string()));  // default_name
    279 
    280   Time time_val;
    281   if (headers->GetLastModifiedValue(&time_val))
    282     response->setLastModifiedDate(time_val.ToDoubleT());
    283 
    284   // Build up the header map.
    285   void* iter = NULL;
    286   std::string name;
    287   while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
    288     response->addHTTPHeaderField(WebString::fromUTF8(name),
    289                                  WebString::fromUTF8(value));
    290   }
    291 }
    292 
    293 net::RequestPriority ConvertWebKitPriorityToNetPriority(
    294     const WebURLRequest::Priority& priority) {
    295   switch (priority) {
    296     case WebURLRequest::PriorityVeryHigh:
    297       return net::HIGHEST;
    298 
    299     case WebURLRequest::PriorityHigh:
    300       return net::MEDIUM;
    301 
    302     case WebURLRequest::PriorityMedium:
    303       return net::LOW;
    304 
    305     case WebURLRequest::PriorityLow:
    306       return net::LOWEST;
    307 
    308     case WebURLRequest::PriorityVeryLow:
    309       return net::IDLE;
    310 
    311     case WebURLRequest::PriorityUnresolved:
    312     default:
    313       NOTREACHED();
    314       return net::LOW;
    315   }
    316 }
    317 
    318 }  // namespace
    319 
    320 // WebURLLoaderImpl::Context --------------------------------------------------
    321 
    322 // This inner class exists since the WebURLLoader may be deleted while inside a
    323 // call to WebURLLoaderClient.  The bridge requires its Peer to stay alive
    324 // until it receives OnCompletedRequest.
    325 class WebURLLoaderImpl::Context : public base::RefCounted<Context>,
    326                                   public ResourceLoaderBridge::Peer {
    327  public:
    328   explicit Context(WebURLLoaderImpl* loader);
    329 
    330   WebURLLoaderClient* client() const { return client_; }
    331   void set_client(WebURLLoaderClient* client) { client_ = client; }
    332 
    333   void Cancel();
    334   void SetDefersLoading(bool value);
    335   void DidChangePriority(WebURLRequest::Priority new_priority);
    336   void Start(
    337       const WebURLRequest& request,
    338       ResourceLoaderBridge::SyncLoadResponse* sync_load_response,
    339       WebKitPlatformSupportImpl* platform);
    340 
    341   // ResourceLoaderBridge::Peer methods:
    342   virtual void OnUploadProgress(uint64 position, uint64 size) OVERRIDE;
    343   virtual bool OnReceivedRedirect(
    344       const GURL& new_url,
    345       const ResourceResponseInfo& info,
    346       bool* has_new_first_party_for_cookies,
    347       GURL* new_first_party_for_cookies) OVERRIDE;
    348   virtual void OnReceivedResponse(const ResourceResponseInfo& info) OVERRIDE;
    349   virtual void OnDownloadedData(int len) OVERRIDE;
    350   virtual void OnReceivedData(const char* data,
    351                               int data_length,
    352                               int encoded_data_length) OVERRIDE;
    353   virtual void OnReceivedCachedMetadata(const char* data, int len) OVERRIDE;
    354   virtual void OnCompletedRequest(
    355       int error_code,
    356       bool was_ignored_by_handler,
    357       const std::string& security_info,
    358       const base::TimeTicks& completion_time) OVERRIDE;
    359 
    360  private:
    361   friend class base::RefCounted<Context>;
    362   virtual ~Context() {}
    363 
    364   // We can optimize the handling of data URLs in most cases.
    365   bool CanHandleDataURL(const GURL& url) const;
    366   void HandleDataURL();
    367 
    368   WebURLLoaderImpl* loader_;
    369   WebURLRequest request_;
    370   WebURLLoaderClient* client_;
    371   WebReferrerPolicy referrer_policy_;
    372   scoped_ptr<ResourceLoaderBridge> bridge_;
    373   scoped_ptr<FtpDirectoryListingResponseDelegate> ftp_listing_delegate_;
    374   scoped_ptr<MultipartResponseDelegate> multipart_delegate_;
    375   scoped_ptr<ResourceLoaderBridge> completed_bridge_;
    376 };
    377 
    378 WebURLLoaderImpl::Context::Context(WebURLLoaderImpl* loader)
    379     : loader_(loader),
    380       client_(NULL),
    381       referrer_policy_(WebKit::WebReferrerPolicyDefault) {
    382 }
    383 
    384 void WebURLLoaderImpl::Context::Cancel() {
    385   // The bridge will still send OnCompletedRequest, which will Release() us, so
    386   // we don't do that here.
    387   if (bridge_)
    388     bridge_->Cancel();
    389 
    390   // Ensure that we do not notify the multipart delegate anymore as it has
    391   // its own pointer to the client.
    392   if (multipart_delegate_)
    393     multipart_delegate_->Cancel();
    394 
    395   // Do not make any further calls to the client.
    396   client_ = NULL;
    397   loader_ = NULL;
    398 }
    399 
    400 void WebURLLoaderImpl::Context::SetDefersLoading(bool value) {
    401   if (bridge_)
    402     bridge_->SetDefersLoading(value);
    403 }
    404 
    405 void WebURLLoaderImpl::Context::DidChangePriority(
    406     WebURLRequest::Priority new_priority) {
    407   if (bridge_)
    408     bridge_->DidChangePriority(
    409         ConvertWebKitPriorityToNetPriority(new_priority));
    410 }
    411 
    412 void WebURLLoaderImpl::Context::Start(
    413     const WebURLRequest& request,
    414     ResourceLoaderBridge::SyncLoadResponse* sync_load_response,
    415     WebKitPlatformSupportImpl* platform) {
    416   DCHECK(!bridge_.get());
    417 
    418   request_ = request;  // Save the request.
    419 
    420   GURL url = request.url();
    421   if (url.SchemeIs("data") && CanHandleDataURL(url)) {
    422     if (sync_load_response) {
    423       // This is a sync load. Do the work now.
    424       sync_load_response->url = url;
    425       std::string data;
    426       GetInfoFromDataURL(sync_load_response->url, sync_load_response,
    427                          &sync_load_response->data,
    428                          &sync_load_response->error_code);
    429     } else {
    430       AddRef();  // Balanced in OnCompletedRequest
    431       base::MessageLoop::current()->PostTask(
    432           FROM_HERE, base::Bind(&Context::HandleDataURL, this));
    433     }
    434     return;
    435   }
    436 
    437   GURL referrer_url(
    438       request.httpHeaderField(WebString::fromUTF8("Referer")).utf8());
    439   const std::string& method = request.httpMethod().utf8();
    440 
    441   int load_flags = net::LOAD_NORMAL;
    442   switch (request.cachePolicy()) {
    443     case WebURLRequest::ReloadIgnoringCacheData:
    444       // Required by LayoutTests/http/tests/misc/refresh-headers.php
    445       load_flags |= net::LOAD_VALIDATE_CACHE;
    446       break;
    447     case WebURLRequest::ReturnCacheDataElseLoad:
    448       load_flags |= net::LOAD_PREFERRING_CACHE;
    449       break;
    450     case WebURLRequest::ReturnCacheDataDontLoad:
    451       load_flags |= net::LOAD_ONLY_FROM_CACHE;
    452       break;
    453     case WebURLRequest::UseProtocolCachePolicy:
    454       break;
    455   }
    456 
    457   if (request.reportUploadProgress())
    458     load_flags |= net::LOAD_ENABLE_UPLOAD_PROGRESS;
    459   if (request.reportLoadTiming())
    460     load_flags |= net::LOAD_ENABLE_LOAD_TIMING;
    461   if (request.reportRawHeaders())
    462     load_flags |= net::LOAD_REPORT_RAW_HEADERS;
    463 
    464   if (!request.allowCookies() || !request.allowStoredCredentials()) {
    465     load_flags |= net::LOAD_DO_NOT_SAVE_COOKIES;
    466     load_flags |= net::LOAD_DO_NOT_SEND_COOKIES;
    467   }
    468 
    469   if (!request.allowStoredCredentials())
    470     load_flags |= net::LOAD_DO_NOT_SEND_AUTH_DATA;
    471 
    472   HeaderFlattener flattener(load_flags);
    473   request.visitHTTPHeaderFields(&flattener);
    474 
    475   // TODO(brettw) this should take parameter encoding into account when
    476   // creating the GURLs.
    477 
    478   ResourceLoaderBridge::RequestInfo request_info;
    479   request_info.method = method;
    480   request_info.url = url;
    481   request_info.first_party_for_cookies = request.firstPartyForCookies();
    482   request_info.referrer = referrer_url;
    483   request_info.headers = flattener.GetBuffer();
    484   request_info.load_flags = load_flags;
    485   // requestor_pid only needs to be non-zero if the request originates outside
    486   // the render process, so we can use requestorProcessID even for requests
    487   // from in-process plugins.
    488   request_info.requestor_pid = request.requestorProcessID();
    489   request_info.request_type =
    490       ResourceType::FromTargetType(request.targetType());
    491   request_info.priority =
    492       ConvertWebKitPriorityToNetPriority(request.priority());
    493   request_info.appcache_host_id = request.appCacheHostID();
    494   request_info.routing_id = request.requestorID();
    495   request_info.download_to_file = request.downloadToFile();
    496   request_info.has_user_gesture = request.hasUserGesture();
    497   request_info.extra_data = request.extraData();
    498   if (request.extraData()) {
    499     referrer_policy_ = static_cast<WebURLRequestExtraDataImpl*>(
    500         request.extraData())->referrer_policy();
    501     request_info.referrer_policy = referrer_policy_;
    502   }
    503   bridge_.reset(platform->CreateResourceLoader(request_info));
    504 
    505   if (!request.httpBody().isNull()) {
    506     // GET and HEAD requests shouldn't have http bodies.
    507     DCHECK(method != "GET" && method != "HEAD");
    508     const WebHTTPBody& httpBody = request.httpBody();
    509     size_t i = 0;
    510     WebHTTPBody::Element element;
    511     scoped_refptr<ResourceRequestBody> request_body = new ResourceRequestBody;
    512     while (httpBody.elementAt(i++, element)) {
    513       switch (element.type) {
    514         case WebHTTPBody::Element::TypeData:
    515           if (!element.data.isEmpty()) {
    516             // WebKit sometimes gives up empty data to append. These aren't
    517             // necessary so we just optimize those out here.
    518             request_body->AppendBytes(
    519                 element.data.data(), static_cast<int>(element.data.size()));
    520           }
    521           break;
    522         case WebHTTPBody::Element::TypeFile:
    523           if (element.fileLength == -1) {
    524             request_body->AppendFileRange(
    525                 base::FilePath::FromUTF16Unsafe(element.filePath),
    526                 0, kuint64max, base::Time());
    527           } else {
    528             request_body->AppendFileRange(
    529                 base::FilePath::FromUTF16Unsafe(element.filePath),
    530                 static_cast<uint64>(element.fileStart),
    531                 static_cast<uint64>(element.fileLength),
    532                 base::Time::FromDoubleT(element.modificationTime));
    533           }
    534           break;
    535         case WebHTTPBody::Element::TypeURL: {
    536           GURL url = GURL(element.url);
    537           DCHECK(url.SchemeIsFileSystem());
    538           request_body->AppendFileSystemFileRange(
    539               url,
    540               static_cast<uint64>(element.fileStart),
    541               static_cast<uint64>(element.fileLength),
    542               base::Time::FromDoubleT(element.modificationTime));
    543           break;
    544         }
    545         case WebHTTPBody::Element::TypeBlob:
    546           request_body->AppendBlob(GURL(element.blobURL));
    547           break;
    548         default:
    549           NOTREACHED();
    550       }
    551     }
    552     request_body->set_identifier(request.httpBody().identifier());
    553     bridge_->SetRequestBody(request_body.get());
    554   }
    555 
    556   if (sync_load_response) {
    557     bridge_->SyncLoad(sync_load_response);
    558     return;
    559   }
    560 
    561   if (bridge_->Start(this)) {
    562     AddRef();  // Balanced in OnCompletedRequest
    563   } else {
    564     bridge_.reset();
    565   }
    566 }
    567 
    568 void WebURLLoaderImpl::Context::OnUploadProgress(uint64 position, uint64 size) {
    569   if (client_)
    570     client_->didSendData(loader_, position, size);
    571 }
    572 
    573 bool WebURLLoaderImpl::Context::OnReceivedRedirect(
    574     const GURL& new_url,
    575     const ResourceResponseInfo& info,
    576     bool* has_new_first_party_for_cookies,
    577     GURL* new_first_party_for_cookies) {
    578   if (!client_)
    579     return false;
    580 
    581   WebURLResponse response;
    582   response.initialize();
    583   PopulateURLResponse(request_.url(), info, &response);
    584 
    585   // TODO(darin): We lack sufficient information to construct the actual
    586   // request that resulted from the redirect.
    587   WebURLRequest new_request(new_url);
    588   new_request.setFirstPartyForCookies(request_.firstPartyForCookies());
    589   new_request.setDownloadToFile(request_.downloadToFile());
    590 
    591   WebString referrer_string = WebString::fromUTF8("Referer");
    592   WebString referrer = WebSecurityPolicy::generateReferrerHeader(
    593       referrer_policy_,
    594       new_url,
    595       request_.httpHeaderField(referrer_string));
    596   if (!referrer.isEmpty())
    597     new_request.setHTTPHeaderField(referrer_string, referrer);
    598 
    599   if (response.httpStatusCode() == 307)
    600     new_request.setHTTPMethod(request_.httpMethod());
    601 
    602   client_->willSendRequest(loader_, new_request, response);
    603   request_ = new_request;
    604   *has_new_first_party_for_cookies = true;
    605   *new_first_party_for_cookies = request_.firstPartyForCookies();
    606 
    607   // Only follow the redirect if WebKit left the URL unmodified.
    608   if (new_url == GURL(new_request.url()))
    609     return true;
    610 
    611   // We assume that WebKit only changes the URL to suppress a redirect, and we
    612   // assume that it does so by setting it to be invalid.
    613   DCHECK(!new_request.url().isValid());
    614   return false;
    615 }
    616 
    617 void WebURLLoaderImpl::Context::OnReceivedResponse(
    618     const ResourceResponseInfo& info) {
    619   if (!client_)
    620     return;
    621 
    622   WebURLResponse response;
    623   response.initialize();
    624   PopulateURLResponse(request_.url(), info, &response);
    625 
    626   bool show_raw_listing = (GURL(request_.url()).query() == "raw");
    627 
    628   if (info.mime_type == "text/vnd.chromium.ftp-dir") {
    629     if (show_raw_listing) {
    630       // Set the MIME type to plain text to prevent any active content.
    631       response.setMIMEType("text/plain");
    632     } else {
    633       // We're going to produce a parsed listing in HTML.
    634       response.setMIMEType("text/html");
    635     }
    636   }
    637 
    638   scoped_refptr<Context> protect(this);
    639   client_->didReceiveResponse(loader_, response);
    640 
    641   // We may have been cancelled after didReceiveResponse, which would leave us
    642   // without a client and therefore without much need to do further handling.
    643   if (!client_)
    644     return;
    645 
    646   DCHECK(!ftp_listing_delegate_.get());
    647   DCHECK(!multipart_delegate_.get());
    648   if (info.headers.get() && info.mime_type == "multipart/x-mixed-replace") {
    649     std::string content_type;
    650     info.headers->EnumerateHeader(NULL, "content-type", &content_type);
    651 
    652     std::string mime_type;
    653     std::string charset;
    654     bool had_charset = false;
    655     std::string boundary;
    656     net::HttpUtil::ParseContentType(content_type, &mime_type, &charset,
    657                                     &had_charset, &boundary);
    658     TrimString(boundary, " \"", &boundary);
    659 
    660     // If there's no boundary, just handle the request normally.  In the gecko
    661     // code, nsMultiMixedConv::OnStartRequest throws an exception.
    662     if (!boundary.empty()) {
    663       multipart_delegate_.reset(
    664           new MultipartResponseDelegate(client_, loader_, response, boundary));
    665     }
    666   } else if (info.mime_type == "text/vnd.chromium.ftp-dir" &&
    667              !show_raw_listing) {
    668     ftp_listing_delegate_.reset(
    669         new FtpDirectoryListingResponseDelegate(client_, loader_, response));
    670   }
    671 }
    672 
    673 void WebURLLoaderImpl::Context::OnDownloadedData(int len) {
    674   if (client_)
    675     client_->didDownloadData(loader_, len);
    676 }
    677 
    678 void WebURLLoaderImpl::Context::OnReceivedData(const char* data,
    679                                                int data_length,
    680                                                int encoded_data_length) {
    681   if (!client_)
    682     return;
    683 
    684   if (ftp_listing_delegate_) {
    685     // The FTP listing delegate will make the appropriate calls to
    686     // client_->didReceiveData and client_->didReceiveResponse.
    687     ftp_listing_delegate_->OnReceivedData(data, data_length);
    688   } else if (multipart_delegate_) {
    689     // The multipart delegate will make the appropriate calls to
    690     // client_->didReceiveData and client_->didReceiveResponse.
    691     multipart_delegate_->OnReceivedData(data, data_length, encoded_data_length);
    692   } else {
    693     client_->didReceiveData(loader_, data, data_length, encoded_data_length);
    694   }
    695 }
    696 
    697 void WebURLLoaderImpl::Context::OnReceivedCachedMetadata(
    698     const char* data, int len) {
    699   if (client_)
    700     client_->didReceiveCachedMetadata(loader_, data, len);
    701 }
    702 
    703 void WebURLLoaderImpl::Context::OnCompletedRequest(
    704     int error_code,
    705     bool was_ignored_by_handler,
    706     const std::string& security_info,
    707     const base::TimeTicks& completion_time) {
    708   if (ftp_listing_delegate_) {
    709     ftp_listing_delegate_->OnCompletedRequest();
    710     ftp_listing_delegate_.reset(NULL);
    711   } else if (multipart_delegate_) {
    712     multipart_delegate_->OnCompletedRequest();
    713     multipart_delegate_.reset(NULL);
    714   }
    715 
    716   // Prevent any further IPC to the browser now that we're complete, but
    717   // don't delete it to keep any downloaded temp files alive.
    718   DCHECK(!completed_bridge_.get());
    719   completed_bridge_.swap(bridge_);
    720 
    721   if (client_) {
    722     if (error_code != net::OK) {
    723       client_->didFail(loader_, CreateError(request_.url(), error_code));
    724     } else {
    725       client_->didFinishLoading(
    726           loader_, (completion_time - TimeTicks()).InSecondsF());
    727     }
    728   }
    729 
    730   // We are done with the bridge now, and so we need to release the reference
    731   // to ourselves that we took on behalf of the bridge.  This may cause our
    732   // destruction.
    733   Release();
    734 }
    735 
    736 bool WebURLLoaderImpl::Context::CanHandleDataURL(const GURL& url) const {
    737   DCHECK(url.SchemeIs("data"));
    738 
    739   // Optimize for the case where we can handle a data URL locally.  We must
    740   // skip this for data URLs targetted at frames since those could trigger a
    741   // download.
    742   //
    743   // NOTE: We special case MIME types we can render both for performance
    744   // reasons as well as to support unit tests, which do not have an underlying
    745   // ResourceLoaderBridge implementation.
    746 
    747 #if defined(OS_ANDROID)
    748   // For compatibility reasons on Android we need to expose top-level data://
    749   // to the browser.
    750   if (request_.targetType() == WebURLRequest::TargetIsMainFrame)
    751     return false;
    752 #endif
    753 
    754   if (request_.targetType() != WebURLRequest::TargetIsMainFrame &&
    755       request_.targetType() != WebURLRequest::TargetIsSubframe)
    756     return true;
    757 
    758   std::string mime_type, unused_charset;
    759   if (net::DataURL::Parse(url, &mime_type, &unused_charset, NULL) &&
    760       net::IsSupportedMimeType(mime_type))
    761     return true;
    762 
    763   return false;
    764 }
    765 
    766 void WebURLLoaderImpl::Context::HandleDataURL() {
    767   ResourceResponseInfo info;
    768   int error_code;
    769   std::string data;
    770 
    771   if (GetInfoFromDataURL(request_.url(), &info, &data, &error_code)) {
    772     OnReceivedResponse(info);
    773     if (!data.empty())
    774       OnReceivedData(data.data(), data.size(), 0);
    775   }
    776 
    777   OnCompletedRequest(error_code, false, info.security_info,
    778                      base::TimeTicks::Now());
    779 }
    780 
    781 // WebURLLoaderImpl -----------------------------------------------------------
    782 
    783 WebURLLoaderImpl::WebURLLoaderImpl(WebKitPlatformSupportImpl* platform)
    784     : context_(new Context(this)),
    785       platform_(platform) {
    786 }
    787 
    788 WebURLLoaderImpl::~WebURLLoaderImpl() {
    789   cancel();
    790 }
    791 
    792 WebURLError WebURLLoaderImpl::CreateError(const WebURL& unreachable_url,
    793                                           int reason) {
    794   WebURLError error;
    795   error.domain = WebString::fromUTF8(net::kErrorDomain);
    796   error.reason = reason;
    797   error.unreachableURL = unreachable_url;
    798   if (reason == net::ERR_ABORTED) {
    799     error.isCancellation = true;
    800   } else if (reason == net::ERR_TEMPORARILY_THROTTLED) {
    801     error.localizedDescription = WebString::fromUTF8(
    802         kThrottledErrorDescription);
    803   }
    804   return error;
    805 }
    806 
    807 void WebURLLoaderImpl::loadSynchronously(const WebURLRequest& request,
    808                                          WebURLResponse& response,
    809                                          WebURLError& error,
    810                                          WebData& data) {
    811   ResourceLoaderBridge::SyncLoadResponse sync_load_response;
    812   context_->Start(request, &sync_load_response, platform_);
    813 
    814   const GURL& final_url = sync_load_response.url;
    815 
    816   // TODO(tc): For file loads, we may want to include a more descriptive
    817   // status code or status text.
    818   int error_code = sync_load_response.error_code;
    819   if (error_code != net::OK) {
    820     response.setURL(final_url);
    821     error.domain = WebString::fromUTF8(net::kErrorDomain);
    822     error.reason = error_code;
    823     error.unreachableURL = final_url;
    824     return;
    825   }
    826 
    827   PopulateURLResponse(final_url, sync_load_response, &response);
    828 
    829   data.assign(sync_load_response.data.data(),
    830               sync_load_response.data.size());
    831 }
    832 
    833 void WebURLLoaderImpl::loadAsynchronously(const WebURLRequest& request,
    834                                           WebURLLoaderClient* client) {
    835   DCHECK(!context_->client());
    836 
    837   context_->set_client(client);
    838   context_->Start(request, NULL, platform_);
    839 }
    840 
    841 void WebURLLoaderImpl::cancel() {
    842   context_->Cancel();
    843 }
    844 
    845 void WebURLLoaderImpl::setDefersLoading(bool value) {
    846   context_->SetDefersLoading(value);
    847 }
    848 
    849 void WebURLLoaderImpl::didChangePriority(WebURLRequest::Priority new_priority) {
    850   context_->DidChangePriority(new_priority);
    851 }
    852 
    853 }  // namespace webkit_glue
    854