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