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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
// Copyright 2013 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.
#include "chrome/browser/local_discovery/privet_url_fetcher.h"
#include "base/bind.h"
#include "base/json/json_reader.h"
#include "base/message_loop/message_loop.h"
#include "base/rand_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/local_discovery/privet_constants.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_request_status.h"
namespace local_discovery {
namespace {
const char kXPrivetTokenHeaderPrefix[] = "X-Privet-Token: ";
const char kXPrivetEmptyToken[] = "\"\"";
const int kPrivetMaxRetries = 20;
const int kPrivetTimeoutOnError = 5;
}
void PrivetURLFetcher::Delegate::OnNeedPrivetToken(
PrivetURLFetcher* fetcher,
const TokenCallback& callback) {
OnError(fetcher, TOKEN_ERROR);
}
PrivetURLFetcher::PrivetURLFetcher(
const std::string& token,
const GURL& url,
net::URLFetcher::RequestType request_type,
net::URLRequestContextGetter* request_context,
PrivetURLFetcher::Delegate* delegate)
: privet_access_token_(token), url_(url), request_type_(request_type),
request_context_(request_context), delegate_(delegate),
do_not_retry_on_transient_error_(false), allow_empty_privet_token_(false),
tries_(0), weak_factory_(this) {
}
PrivetURLFetcher::~PrivetURLFetcher() {
}
void PrivetURLFetcher::DoNotRetryOnTransientError() {
do_not_retry_on_transient_error_ = true;
}
void PrivetURLFetcher::AllowEmptyPrivetToken() {
allow_empty_privet_token_ = true;
}
void PrivetURLFetcher::Try() {
tries_++;
if (tries_ < kPrivetMaxRetries) {
std::string token = privet_access_token_;
if (token.empty())
token = kXPrivetEmptyToken;
url_fetcher_.reset(net::URLFetcher::Create(url_, request_type_, this));
url_fetcher_->SetRequestContext(request_context_);
url_fetcher_->AddExtraRequestHeader(std::string(kXPrivetTokenHeaderPrefix) +
token);
// URLFetcher requires us to set upload data for POST requests.
if (request_type_ == net::URLFetcher::POST)
url_fetcher_->SetUploadData(upload_content_type_, upload_data_);
url_fetcher_->Start();
} else {
delegate_->OnError(this, RETRY_ERROR);
}
}
void PrivetURLFetcher::Start() {
DCHECK_EQ(tries_, 0); // We haven't called |Start()| yet.
if (privet_access_token_.empty() && !allow_empty_privet_token_) {
RequestTokenRefresh();
} else {
Try();
}
}
void PrivetURLFetcher::SetUploadData(const std::string& upload_content_type,
const std::string& upload_data) {
upload_content_type_ = upload_content_type;
upload_data_ = upload_data;
}
void PrivetURLFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
if (source->GetStatus().status() != net::URLRequestStatus::SUCCESS ||
source->GetResponseCode() == net::HTTP_SERVICE_UNAVAILABLE) {
ScheduleRetry(kPrivetTimeoutOnError);
return;
}
if (source->GetResponseCode() != net::HTTP_OK) {
delegate_->OnError(this, RESPONSE_CODE_ERROR);
return;
}
std::string response_str;
if (!source->GetResponseAsString(&response_str)) {
delegate_->OnError(this, URL_FETCH_ERROR);
return;
}
base::JSONReader json_reader(base::JSON_ALLOW_TRAILING_COMMAS);
scoped_ptr<base::Value> value;
value.reset(json_reader.ReadToValue(response_str));
if (!value) {
delegate_->OnError(this, JSON_PARSE_ERROR);
return;
}
const base::DictionaryValue* dictionary_value;
if (!value->GetAsDictionary(&dictionary_value)) {
delegate_->OnError(this, JSON_PARSE_ERROR);
return;
}
std::string error;
if (dictionary_value->GetString(kPrivetKeyError, &error)) {
if (error == kPrivetErrorInvalidXPrivetToken) {
RequestTokenRefresh();
return;
} else if (PrivetErrorTransient(error) ||
dictionary_value->HasKey(kPrivetKeyTimeout)) {
if (!do_not_retry_on_transient_error_) {
int timeout_seconds;
if (!dictionary_value->GetInteger(kPrivetKeyTimeout,
&timeout_seconds)) {
timeout_seconds = kPrivetDefaultTimeout;
}
ScheduleRetry(timeout_seconds);
return;
}
}
}
delegate_->OnParsedJson(this, dictionary_value,
dictionary_value->HasKey(kPrivetKeyError));
}
void PrivetURLFetcher::ScheduleRetry(int timeout_seconds) {
double random_scaling_factor =
1 + base::RandDouble() * kPrivetMaximumTimeRandomAddition;
int timeout_seconds_randomized =
static_cast<int>(timeout_seconds * random_scaling_factor);
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&PrivetURLFetcher::Try, weak_factory_.GetWeakPtr()),
base::TimeDelta::FromSeconds(timeout_seconds_randomized));
}
void PrivetURLFetcher::RequestTokenRefresh() {
delegate_->OnNeedPrivetToken(
this,
base::Bind(&PrivetURLFetcher::RefreshToken, weak_factory_.GetWeakPtr()));
}
void PrivetURLFetcher::RefreshToken(const std::string& token) {
if (token.empty()) {
delegate_->OnError(this, TOKEN_ERROR);
} else {
privet_access_token_ = token;
Try();
}
}
bool PrivetURLFetcher::PrivetErrorTransient(const std::string& error) {
return (error == kPrivetErrorDeviceBusy) ||
(error == kPrivetErrorPendingUserAction);
}
PrivetURLFetcherFactory::PrivetURLFetcherFactory(
net::URLRequestContextGetter* request_context)
: request_context_(request_context) {
}
PrivetURLFetcherFactory::~PrivetURLFetcherFactory() {
}
scoped_ptr<PrivetURLFetcher> PrivetURLFetcherFactory::CreateURLFetcher(
const GURL& url, net::URLFetcher::RequestType request_type,
PrivetURLFetcher::Delegate* delegate) const {
return scoped_ptr<PrivetURLFetcher>(
new PrivetURLFetcher(token_, url, request_type, request_context_.get(),
delegate));
}
} // namespace local_discovery
|
