1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_PROXY_INIT_PROXY_RESOLVER_H_
#define NET_PROXY_INIT_PROXY_RESOLVER_H_
#pragma once
#include <vector>
#include "base/string16.h"
#include "base/time.h"
#include "base/timer.h"
#include "googleurl/src/gurl.h"
#include "net/base/completion_callback.h"
#include "net/base/net_log.h"
namespace net {
class ProxyConfig;
class ProxyResolver;
class ProxyScriptFetcher;
// InitProxyResolver is a helper class used by ProxyService to
// initialize a ProxyResolver with the PAC script data specified
// by a particular ProxyConfig.
//
// This involves trying to use PAC scripts in this order:
//
// (1) WPAD if auto-detect is on.
// (2) Custom PAC script if a URL was given.
//
// If no PAC script was successfully downloaded + parsed, then it fails with
// a network error. Otherwise the proxy resolver is left initialized with
// the PAC script.
//
// Deleting InitProxyResolver while Init() is in progress, will
// cancel the request.
//
class InitProxyResolver {
public:
// |resolver|, |proxy_script_fetcher| and |net_log| must remain valid for
// the lifespan of InitProxyResolver.
InitProxyResolver(ProxyResolver* resolver,
ProxyScriptFetcher* proxy_script_fetcher,
NetLog* net_log);
// Aborts any in-progress request.
~InitProxyResolver();
// Applies the PAC settings of |config| to |resolver_|.
// If |wait_delay| is positive, the initialization will pause for this
// amount of time before getting started.
// If |effective_config| is non-NULL, then on successful initialization of
// |resolver_| the "effective" proxy settings we ended up using will be
// written out to |*effective_config|. Note that this may differ from
// |config| since we will have stripped any manual settings, and decided
// whether to use auto-detect or the custom PAC URL. Finally, if auto-detect
// was used we may now have resolved that to a specific script URL.
int Init(const ProxyConfig& config,
const base::TimeDelta wait_delay,
ProxyConfig* effective_config,
CompletionCallback* callback);
private:
enum State {
STATE_NONE,
STATE_WAIT,
STATE_WAIT_COMPLETE,
STATE_FETCH_PAC_SCRIPT,
STATE_FETCH_PAC_SCRIPT_COMPLETE,
STATE_SET_PAC_SCRIPT,
STATE_SET_PAC_SCRIPT_COMPLETE,
};
struct PacURL {
PacURL(bool auto_detect, const GURL& url)
: auto_detect(auto_detect), url(url) {}
bool auto_detect;
GURL url;
};
typedef std::vector<PacURL> UrlList;
// Returns ordered list of PAC urls to try for |config|.
UrlList BuildPacUrlsFallbackList(const ProxyConfig& config) const;
void OnIOCompletion(int result);
int DoLoop(int result);
void DoCallback(int result);
int DoWait();
int DoWaitComplete(int result);
int DoFetchPacScript();
int DoFetchPacScriptComplete(int result);
int DoSetPacScript();
int DoSetPacScriptComplete(int result);
// Tries restarting using the next fallback PAC URL:
// |pac_urls_[++current_pac_url_index]|.
// Returns OK and rewinds the state machine when there
// is something to try, otherwise returns |error|.
int TryToFallbackPacUrl(int error);
// Gets the initial state (we skip fetching when the
// ProxyResolver doesn't |expect_pac_bytes()|.
State GetStartState() const;
// Returns the current PAC URL we are fetching/testing.
const PacURL& current_pac_url() const;
void OnWaitTimerFired();
void DidCompleteInit();
void Cancel();
ProxyResolver* resolver_;
ProxyScriptFetcher* proxy_script_fetcher_;
CompletionCallbackImpl<InitProxyResolver> io_callback_;
CompletionCallback* user_callback_;
size_t current_pac_url_index_;
// Filled when the PAC script fetch completes.
string16 pac_script_;
UrlList pac_urls_;
State next_state_;
BoundNetLog net_log_;
base::TimeDelta wait_delay_;
base::OneShotTimer<InitProxyResolver> wait_timer_;
ProxyConfig* effective_config_;
DISALLOW_COPY_AND_ASSIGN(InitProxyResolver);
};
} // namespace net
#endif // NET_PROXY_INIT_PROXY_RESOLVER_H_
|
