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1 // Copyright (c) 2011 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_PROXY_DHCP_SCRIPT_FETCHER_H_ | |
6 #define NET_PROXY_DHCP_SCRIPT_FETCHER_H_ | |
7 #pragma once | |
8 | |
9 #include "base/basictypes.h" | |
10 #include "base/compiler_specific.h" | |
11 #include "base/string16.h" | |
12 #include "net/base/completion_callback.h" | |
13 #include "net/proxy/proxy_script_fetcher.h" | |
14 #include "net/url_request/url_request_context.h" | |
15 | |
16 namespace net { | |
17 | |
18 // Interface for classes that can fetch a proxy script as configured via DHCP. | |
19 // | |
20 // The Fetch method on this interface tries to retrieve the most appropriate | |
21 // PAC script configured via DHCP. | |
22 // | |
23 // Normally there are zero or one DHCP scripts configured, but in the | |
24 // presence of multiple adapters with DHCP enabled, the fetcher resolves | |
25 // which PAC script to use if one or more are available. | |
26 class DhcpProxyScriptFetcher { | |
27 public: | |
28 // Destruction should cancel any outstanding requests. | |
29 virtual ~DhcpProxyScriptFetcher(); | |
30 | |
31 // Attempts to retrieve the most appropriate PAC script configured via DHCP, | |
32 // and invokes |callback| on completion. | |
33 // | |
34 // Returns OK on success, otherwise the error code. If the return code is | |
35 // ERR_IO_PENDING, then the request completes asynchronously, and |callback| | |
36 // will be invoked later with the final error code. | |
37 // | |
38 // After synchronous or asynchronous completion with a result code of OK, | |
39 // |*utf16_text| is filled with the response. On failure, the result text is | |
40 // an empty string, and the result code is a network error. Some special | |
41 // network errors that may occur are: | |
42 // | |
43 // ERR_PAC_NOT_IN_DHCP -- no script configured in DHCP. | |
44 // | |
45 // The following all indicate there was one or more script configured | |
46 // in DHCP but all failed to download, and the error for the most | |
47 // preferred adapter that had a script configured was what the error | |
48 // code says: | |
49 // | |
50 // ERR_TIMED_OUT -- fetch took too long to complete. | |
51 // ERR_FILE_TOO_BIG -- response body was too large. | |
52 // ERR_PAC_STATUS_NOT_OK -- script failed to download. | |
53 // ERR_NOT_IMPLEMENTED -- script required authentication. | |
54 // | |
55 // If the request is cancelled (either using the "Cancel()" method or by | |
56 // deleting |this|), then no callback is invoked. | |
57 // | |
58 // Only one fetch is allowed to be outstanding at a time. | |
59 virtual int Fetch(string16* utf16_text, | |
eroman
2011/05/13 05:03:32
Can this take a GURL* parameter rather than exposi
Jói
2011/05/13 20:19:09
It could, but in my opinion the current approach i
| |
60 CompletionCallback* callback) = 0; | |
61 | |
62 // Aborts the in-progress fetch (if any). | |
63 virtual void Cancel() = 0; | |
64 | |
65 // Returns the request context that this fetcher uses to issue downloads, | |
66 // or NULL. | |
67 virtual URLRequestContext* GetRequestContext() const = 0; | |
eroman
2011/05/13 05:03:32
Is this necessary?
Jói
2011/05/13 20:19:09
Nope, it was a hold-over from when I merged the cl
| |
68 | |
69 // After successful completion of |Fetch()|, this will return the URL | |
70 // retrieved from DHCP. It is reset if/when |Fetch()| is called again. | |
71 virtual GURL GetPacURL() const = 0; | |
72 | |
73 // Intended for unit tests only, so they can test that factories return | |
74 // the right types under given circumstances. | |
75 virtual std::string GetFetcherName() const; | |
76 | |
77 protected: | |
78 DhcpProxyScriptFetcher(); | |
79 | |
80 private: | |
81 DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcher); | |
82 }; | |
83 | |
84 // A do-nothing retriever, always returns synchronously with | |
85 // ERR_NOT_IMPLEMENTED result and empty text. | |
86 class DoNothingDhcpProxyScriptFetcher : public DhcpProxyScriptFetcher { | |
87 public: | |
88 DoNothingDhcpProxyScriptFetcher(); | |
89 virtual ~DoNothingDhcpProxyScriptFetcher(); | |
90 | |
91 virtual int Fetch(string16* utf16_text, | |
92 CompletionCallback* callback) OVERRIDE; | |
93 virtual void Cancel() OVERRIDE; | |
94 virtual URLRequestContext* GetRequestContext() const OVERRIDE; | |
95 virtual GURL GetPacURL() const OVERRIDE; | |
96 private: | |
97 DISALLOW_COPY_AND_ASSIGN(DoNothingDhcpProxyScriptFetcher); | |
98 }; | |
99 | |
100 } // namespace net | |
101 | |
102 #endif // NET_PROXY_DHCP_SCRIPT_FETCHER_H_ | |
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