net/url_request/url_request_http_job.h

   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 #ifndef NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_
   6 #define NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "base/time/time.h"
  15 #include "net/base/auth.h"
  16 #include "net/base/completion_callback.h"
  17 #include "net/base/net_export.h"
  18 #include "net/base/sdch_manager.h"
  19 #include "net/cookies/cookie_store.h"
  20 #include "net/filter/filter.h"
  21 #include "net/http/http_request_info.h"
  22 #include "net/url_request/url_request_job.h"
  23 #include "net/url_request/url_request_throttler_entry_interface.h"
  24
  25 namespace net {
  26
  27 class HttpRequestHeaders;
  28 class HttpResponseHeaders;
  29 class HttpResponseInfo;
  30 class HttpTransaction;
  31 class HttpUserAgentSettings;
  32 class ProxyInfo;
  33 class UploadDataStream;
  34 class URLRequestContext;
  35
  36 // A URLRequestJob subclass that is built on top of HttpTransaction. It
  37 // provides an implementation for both HTTP and HTTPS.
  38 class NET_EXPORT_PRIVATE URLRequestHttpJob : public URLRequestJob {
  39  public:
  40   static URLRequestJob* Factory(URLRequest* request,
  41                                 NetworkDelegate* network_delegate,
  42                                 const std::string& scheme);
  43
  44  protected:
  45   URLRequestHttpJob(URLRequest* request,
  46                     NetworkDelegate* network_delegate,
  47                     const HttpUserAgentSettings* http_user_agent_settings);
  48
  49   ~URLRequestHttpJob() override;
  50
  51   // Overridden from URLRequestJob:
  52   void SetPriority(RequestPriority priority) override;
  53   void Start() override;
  54   void Kill() override;
  55
  56   RequestPriority priority() const {
  57     return priority_;
  58   }
  59
  60  private:
  61   enum CompletionCause {
  62     ABORTED,
  63     FINISHED
  64   };
  65
  66   typedef base::RefCountedData<bool> SharedBoolean;
  67
  68   class HttpFilterContext;
  69   class HttpTransactionDelegateImpl;
  70
  71   // Shadows URLRequestJob's version of this method so we can grab cookies.
  72   void NotifyHeadersComplete();
  73
  74   // Shadows URLRequestJob's method so we can record histograms.
  75   void NotifyDone(const URLRequestStatus& status);
  76
  77   void DestroyTransaction();
  78
  79   void AddExtraHeaders();
  80   void AddCookieHeaderAndStart();
  81   void SaveCookiesAndNotifyHeadersComplete(int result);
  82   void SaveNextCookie();
  83   void FetchResponseCookies(std::vector<std::string>* cookies);
  84
  85   // Processes the Strict-Transport-Security header, if one exists.
  86   void ProcessStrictTransportSecurityHeader();
  87
  88   // Processes the Public-Key-Pins header, if one exists.
  89   void ProcessPublicKeyPinsHeader();
  90
  91   // |result| should be net::OK, or the request is canceled.
  92   void OnHeadersReceivedCallback(int result);
  93   void OnStartCompleted(int result);
  94   void OnReadCompleted(int result);
  95   void NotifyBeforeSendHeadersCallback(int result);
  96   void NotifyBeforeSendProxyHeadersCallback(
  97       const ProxyInfo& proxy_info,
  98       HttpRequestHeaders* request_headers);
  99
 100   void RestartTransactionWithAuth(const AuthCredentials& credentials);
 101
 102   // Overridden from URLRequestJob:
 103   void SetUpload(UploadDataStream* upload) override;
 104   void SetExtraRequestHeaders(const HttpRequestHeaders& headers) override;
 105   LoadState GetLoadState() const override;
 106   UploadProgress GetUploadProgress() const override;
 107   bool GetMimeType(std::string* mime_type) const override;
 108   bool GetCharset(std::string* charset) override;
 109   void GetResponseInfo(HttpResponseInfo* info) override;
 110   void GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const override;
 111   bool GetResponseCookies(std::vector<std::string>* cookies) override;
 112   int GetResponseCode() const override;
 113   Filter* SetupFilter() const override;
 114   bool CopyFragmentOnRedirect(const GURL& location) const override;
 115   bool IsSafeRedirect(const GURL& location) override;
 116   bool NeedsAuth() override;
 117   void GetAuthChallengeInfo(scoped_refptr<AuthChallengeInfo>*) override;
 118   void SetAuth(const AuthCredentials& credentials) override;
 119   void CancelAuth() override;
 120   void ContinueWithCertificate(X509Certificate* client_cert) override;
 121   void ContinueDespiteLastError() override;
 122   void ResumeNetworkStart() override;
 123   bool ReadRawData(IOBuffer* buf, int buf_size, int* bytes_read) override;
 124   void StopCaching() override;
 125   bool GetFullRequestHeaders(HttpRequestHeaders* headers) const override;
 126   int64 GetTotalReceivedBytes() const override;
 127   void DoneReading() override;
 128   void DoneReadingRedirectResponse() override;
 129
 130   HostPortPair GetSocketAddress() const override;
 131   void NotifyURLRequestDestroyed() override;
 132
 133   void RecordTimer();
 134   void ResetTimer();
 135
 136   void UpdatePacketReadTimes() override;
 137   void RecordPacketStats(FilterContext::StatisticSelector statistic) const;
 138
 139   void RecordCompressionHistograms();
 140   bool IsCompressibleContent() const;
 141
 142   // Starts the transaction if extensions using the webrequest API do not
 143   // object.
 144   void StartTransaction();
 145   // If |result| is net::OK, calls StartTransactionInternal. Otherwise notifies
 146   // cancellation.
 147   void MaybeStartTransactionInternal(int result);
 148   void StartTransactionInternal();
 149
 150   void RecordPerfHistograms(CompletionCause reason);
 151   void DoneWithRequest(CompletionCause reason);
 152
 153   // Callback functions for Cookie Monster
 154   void DoLoadCookies();
 155   void CheckCookiePolicyAndLoad(const CookieList& cookie_list);
 156   void OnCookiesLoaded(const std::string& cookie_line);
 157   void DoStartTransaction();
 158
 159   // See the implementation for a description of save_next_cookie_running and
 160   // callback_pending.
 161   void OnCookieSaved(scoped_refptr<SharedBoolean> save_next_cookie_running,
 162                      scoped_refptr<SharedBoolean> callback_pending,
 163                      bool cookie_status);
 164
 165   // Some servers send the body compressed, but specify the content length as
 166   // the uncompressed size. If this is the case, we return true in order
 167   // to request to work around this non-adherence to the HTTP standard.
 168   // |rv| is the standard return value of a read function indicating the number
 169   // of bytes read or, if negative, an error code.
 170   bool ShouldFixMismatchedContentLength(int rv) const;
 171
 172   // Returns the effective response headers, considering that they may be
 173   // overridden by |override_response_headers_|.
 174   HttpResponseHeaders* GetResponseHeaders() const;
 175
 176   RequestPriority priority_;
 177
 178   HttpRequestInfo request_info_;
 179   const HttpResponseInfo* response_info_;
 180
 181   std::vector<std::string> response_cookies_;
 182   size_t response_cookies_save_index_;
 183   base::Time response_date_;
 184
 185   // Auth states for proxy and origin server.
 186   AuthState proxy_auth_state_;
 187   AuthState server_auth_state_;
 188   AuthCredentials auth_credentials_;
 189
 190   CompletionCallback start_callback_;
 191   CompletionCallback notify_before_headers_sent_callback_;
 192
 193   bool read_in_progress_;
 194
 195   scoped_ptr<HttpTransaction> transaction_;
 196
 197   // This is used to supervise traffic and enforce exponential
 198   // back-off. May be NULL.
 199   scoped_refptr<URLRequestThrottlerEntryInterface> throttling_entry_;
 200
 201   // A handle to the SDCH dictionaries that were advertised in this request.
 202   // May be null.
 203   scoped_ptr<SdchManager::DictionarySet> dictionaries_advertised_;
 204
 205   // For SDCH latency experiments, when we are able to do SDCH, we may enable
 206   // either an SDCH latency test xor a pass through test. The following bools
 207   // indicate what we decided on for this instance.
 208   bool sdch_test_activated_;  // Advertising a dictionary for sdch.
 209   bool sdch_test_control_;    // Not even accepting-content sdch.
 210
 211   // For recording of stats, we need to remember if this is cached content.
 212   bool is_cached_content_;
 213
 214   base::Time request_creation_time_;
 215
 216   // Data used for statistics gathering. This data is only used for histograms
 217   // and is not required. It is only gathered if packet_timing_enabled_ == true.
 218   //
 219   // TODO(jar): improve the quality of the gathered info by gathering most times
 220   // at a lower point in the network stack, assuring we have actual packet
 221   // boundaries, rather than approximations. Also note that input byte count
 222   // as gathered here is post-SSL, and post-cache-fetch, and does not reflect
 223   // true packet arrival times in such cases.
 224
 225   // Enable recording of packet arrival times for histogramming.
 226   bool packet_timing_enabled_;
 227   bool done_;  // True when we are done doing work.
 228
 229   // The number of bytes that have been accounted for in packets (where some of
 230   // those packets may possibly have had their time of arrival recorded).
 231   int64 bytes_observed_in_packets_;
 232
 233   // The request time may not be available when we are being destroyed, so we
 234   // snapshot it early on.
 235   base::Time request_time_snapshot_;
 236
 237   // Since we don't save all packet times in packet_times_, we save the
 238   // last time for use in histograms.
 239   base::Time final_packet_time_;
 240
 241   // The start time for the job, ignoring re-starts.
 242   base::TimeTicks start_time_;
 243
 244   // When the transaction finished reading the request headers.
 245   base::TimeTicks receive_headers_end_;
 246
 247   scoped_ptr<HttpFilterContext> filter_context_;
 248
 249   CompletionCallback on_headers_received_callback_;
 250
 251   // We allow the network delegate to modify a copy of the response headers.
 252   // This prevents modifications of headers that are shared with the underlying
 253   // layers of the network stack.
 254   scoped_refptr<HttpResponseHeaders> override_response_headers_;
 255
 256   // The network delegate can mark a URL as safe for redirection.
 257   // The reference fragment of the original URL is not appended to the redirect
 258   // URL when the redirect URL is equal to |allowed_unsafe_redirect_url_|.
 259   GURL allowed_unsafe_redirect_url_;
 260
 261   // Flag used to verify that |this| is not deleted while we are awaiting
 262   // a callback from the NetworkDelegate. Used as a fail-fast mechanism.
 263   // True if we are waiting a callback and
 264   // NetworkDelegate::NotifyURLRequestDestroyed has not been called, yet,
 265   // to inform the NetworkDelegate that it may not call back.
 266   bool awaiting_callback_;
 267
 268   const HttpUserAgentSettings* http_user_agent_settings_;
 269
 270   base::WeakPtrFactory<URLRequestHttpJob> weak_factory_;
 271
 272   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 273 };
 274
 275 }  // namespace net
 276
 277 #endif  // NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_