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.
5 #ifndef NET_BASE_NETWORK_DELEGATE_H_
6 #define NET_BASE_NETWORK_DELEGATE_H_
10 #include "base/callback.h"
11 #include "base/strings/string16.h"
12 #include "base/threading/non_thread_safe.h"
13 #include "net/base/auth.h"
14 #include "net/base/completion_callback.h"
15 #include "net/cookies/canonical_cookie.h"
25 // NOTE: Layering violations!
26 // We decided to accept these violations (depending
27 // on other net/ submodules from net/base/), because otherwise NetworkDelegate
28 // would have to be broken up into too many smaller interfaces targeted to each
29 // submodule. Also, since the lower levels in net/ may callback into higher
30 // levels, we may encounter dangerous casting issues.
32 // NOTE: It is not okay to add any compile-time dependencies on symbols outside
33 // of net/base here, because we have a net_base library. Forward declarations
36 class HttpRequestHeaders;
37 class HttpResponseHeaders;
41 class NET_EXPORT NetworkDelegate : public base::NonThreadSafe {
43 // AuthRequiredResponse indicates how a NetworkDelegate handles an
44 // OnAuthRequired call. It's placed in this file to prevent url_request.h
45 // from having to include network_delegate.h.
46 enum AuthRequiredResponse {
47 AUTH_REQUIRED_RESPONSE_NO_ACTION,
48 AUTH_REQUIRED_RESPONSE_SET_AUTH,
49 AUTH_REQUIRED_RESPONSE_CANCEL_AUTH,
50 AUTH_REQUIRED_RESPONSE_IO_PENDING,
52 typedef base::Callback<void(AuthRequiredResponse)> AuthCallback;
54 enum RequestWaitState {
55 REQUEST_WAIT_STATE_CACHE_START,
56 REQUEST_WAIT_STATE_CACHE_FINISH,
57 REQUEST_WAIT_STATE_NETWORK_START,
58 REQUEST_WAIT_STATE_NETWORK_FINISH,
59 REQUEST_WAIT_STATE_RESET
62 virtual ~NetworkDelegate() {}
64 // Notification interface called by the network stack. Note that these
65 // functions mostly forward to the private virtuals. They also add some sanity
66 // checking on parameters. See the corresponding virtuals for explanations of
67 // the methods and their arguments.
68 int NotifyBeforeURLRequest(URLRequest* request,
69 const CompletionCallback& callback,
71 int NotifyBeforeSendHeaders(URLRequest* request,
72 const CompletionCallback& callback,
73 HttpRequestHeaders* headers);
74 void NotifySendHeaders(URLRequest* request,
75 const HttpRequestHeaders& headers);
76 int NotifyHeadersReceived(
78 const CompletionCallback& callback,
79 const HttpResponseHeaders* original_response_headers,
80 scoped_refptr<HttpResponseHeaders>* override_response_headers);
81 void NotifyBeforeRedirect(URLRequest* request,
82 const GURL& new_location);
83 void NotifyResponseStarted(URLRequest* request);
84 void NotifyRawBytesRead(const URLRequest& request, int bytes_read);
85 void NotifyCompleted(URLRequest* request, bool started);
86 void NotifyURLRequestDestroyed(URLRequest* request);
87 void NotifyPACScriptError(int line_number, const base::string16& error);
88 AuthRequiredResponse NotifyAuthRequired(URLRequest* request,
89 const AuthChallengeInfo& auth_info,
90 const AuthCallback& callback,
91 AuthCredentials* credentials);
92 bool CanGetCookies(const URLRequest& request,
93 const CookieList& cookie_list);
94 bool CanSetCookie(const URLRequest& request,
95 const std::string& cookie_line,
96 CookieOptions* options);
97 bool CanAccessFile(const URLRequest& request,
98 const base::FilePath& path) const;
99 bool CanThrottleRequest(const URLRequest& request) const;
100 bool CanEnablePrivacyMode(const GURL& url,
101 const GURL& first_party_for_cookies) const;
103 int NotifyBeforeSocketStreamConnect(SocketStream* socket,
104 const CompletionCallback& callback);
106 void NotifyRequestWaitStateChange(const URLRequest& request,
107 RequestWaitState state);
110 // This is the interface for subclasses of NetworkDelegate to implement. These
111 // member functions will be called by the respective public notification
112 // member function, which will perform basic sanity checking.
114 // Called before a request is sent. Allows the delegate to rewrite the URL
115 // being fetched by modifying |new_url|. |callback| and |new_url| are valid
116 // only until OnURLRequestDestroyed is called for this request. Returns a net
117 // status code, generally either OK to continue with the request or
118 // ERR_IO_PENDING if the result is not ready yet. A status code other than OK
119 // and ERR_IO_PENDING will cancel the request and report the status code as
122 // The default implementation returns OK (continue with request).
123 virtual int OnBeforeURLRequest(URLRequest* request,
124 const CompletionCallback& callback,
127 // Called right before the HTTP headers are sent. Allows the delegate to
128 // read/write |headers| before they get sent out. |callback| and |headers| are
129 // valid only until OnCompleted or OnURLRequestDestroyed is called for this
131 // See OnBeforeURLRequest for return value description. Returns OK by default.
132 virtual int OnBeforeSendHeaders(URLRequest* request,
133 const CompletionCallback& callback,
134 HttpRequestHeaders* headers);
136 // Called right before the HTTP request(s) are being sent to the network.
137 // |headers| is only valid until OnCompleted or OnURLRequestDestroyed is
138 // called for this request.
139 virtual void OnSendHeaders(URLRequest* request,
140 const HttpRequestHeaders& headers);
142 // Called for HTTP requests when the headers have been received.
143 // |original_response_headers| contains the headers as received over the
144 // network, these must not be modified. |override_response_headers| can be set
145 // to new values, that should be considered as overriding
146 // |original_response_headers|.
147 // |callback|, |original_response_headers|, and |override_response_headers|
148 // are only valid until OnURLRequestDestroyed is called for this request.
149 // See OnBeforeURLRequest for return value description. Returns OK by default.
150 virtual int OnHeadersReceived(
152 const CompletionCallback& callback,
153 const HttpResponseHeaders* original_response_headers,
154 scoped_refptr<HttpResponseHeaders>* override_response_headers);
156 // Called right after a redirect response code was received.
157 // |new_location| is only valid until OnURLRequestDestroyed is called for this
159 virtual void OnBeforeRedirect(URLRequest* request,
160 const GURL& new_location);
162 // This corresponds to URLRequestDelegate::OnResponseStarted.
163 virtual void OnResponseStarted(URLRequest* request);
165 // Called every time we read raw bytes.
166 virtual void OnRawBytesRead(const URLRequest& request, int bytes_read);
168 // Indicates that the URL request has been completed or failed.
169 // |started| indicates whether the request has been started. If false,
170 // some information like the socket address is not available.
171 virtual void OnCompleted(URLRequest* request, bool started);
173 // Called when an URLRequest is being destroyed. Note that the request is
174 // being deleted, so it's not safe to call any methods that may result in
175 // a virtual method call.
176 virtual void OnURLRequestDestroyed(URLRequest* request);
178 // Corresponds to ProxyResolverJSBindings::OnError.
179 virtual void OnPACScriptError(int line_number,
180 const base::string16& error);
182 // Called when a request receives an authentication challenge
183 // specified by |auth_info|, and is unable to respond using cached
184 // credentials. |callback| and |credentials| must be non-NULL, and must
185 // be valid until OnURLRequestDestroyed is called for |request|.
187 // The following return values are allowed:
188 // - AUTH_REQUIRED_RESPONSE_NO_ACTION: |auth_info| is observed, but
189 // no action is being taken on it.
190 // - AUTH_REQUIRED_RESPONSE_SET_AUTH: |credentials| is filled in with
191 // a username and password, which should be used in a response to
193 // - AUTH_REQUIRED_RESPONSE_CANCEL_AUTH: The authentication challenge
194 // should not be attempted.
195 // - AUTH_REQUIRED_RESPONSE_IO_PENDING: The action will be decided
196 // asynchronously. |callback| will be invoked when the decision is made,
197 // and one of the other AuthRequiredResponse values will be passed in with
198 // the same semantics as described above.
199 virtual AuthRequiredResponse OnAuthRequired(
201 const AuthChallengeInfo& auth_info,
202 const AuthCallback& callback,
203 AuthCredentials* credentials);
205 // Called when reading cookies to allow the network delegate to block access
206 // to the cookie. This method will never be invoked when
207 // LOAD_DO_NOT_SEND_COOKIES is specified.
208 virtual bool OnCanGetCookies(const URLRequest& request,
209 const CookieList& cookie_list);
211 // Called when a cookie is set to allow the network delegate to block access
212 // to the cookie. This method will never be invoked when
213 // LOAD_DO_NOT_SAVE_COOKIES is specified.
214 virtual bool OnCanSetCookie(const URLRequest& request,
215 const std::string& cookie_line,
216 CookieOptions* options);
218 // Called when a file access is attempted to allow the network delegate to
219 // allow or block access to the given file path. Returns true if access is
221 virtual bool OnCanAccessFile(const URLRequest& request,
222 const base::FilePath& path) const;
224 // Returns true if the given request may be rejected when the
225 // URLRequestThrottlerManager believes the server servicing the
226 // request is overloaded or down.
227 virtual bool OnCanThrottleRequest(const URLRequest& request) const;
229 // Returns true if the given |url| has to be requested over connection that
230 // is not tracked by the server. Usually is false, unless user privacy
231 // settings block cookies from being get or set.
232 virtual bool OnCanEnablePrivacyMode(
234 const GURL& first_party_for_cookies) const;
236 // Called before a SocketStream tries to connect.
237 // See OnBeforeURLRequest for return value description. Returns OK by default.
238 virtual int OnBeforeSocketStreamConnect(
239 SocketStream* socket, const CompletionCallback& callback);
241 // Called when the completion of a URLRequest is blocking on a cache
242 // action or a network action, or when that is no longer the case.
243 // REQUEST_WAIT_STATE_RESET indicates for a given URLRequest
244 // cancellation of any pending waits for this request.
245 virtual void OnRequestWaitStateChange(const URLRequest& request,
246 RequestWaitState state);
251 #endif // NET_BASE_NETWORK_DELEGATE_H_