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
203
204
205
206
207
|
// Copyright (c) 2012 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 "remoting/host/register_support_host_request.h"
#include <stdint.h>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "remoting/base/constants.h"
#include "remoting/host/host_config.h"
#include "remoting/signaling/iq_sender.h"
#include "remoting/signaling/jid_util.h"
#include "remoting/signaling/signal_strategy.h"
#include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
#include "third_party/webrtc/libjingle/xmpp/constants.h"
using buzz::QName;
using buzz::XmlElement;
namespace remoting {
namespace {
// Strings used in the request message we send to the bot.
const char kRegisterQueryTag[] = "register-support-host";
const char kPublicKeyTag[] = "public-key";
const char kSignatureTag[] = "signature";
const char kSignatureTimeAttr[] = "time";
// Strings used to parse responses received from the bot.
const char kRegisterQueryResultTag[] = "register-support-host-result";
const char kSupportIdTag[] = "support-id";
const char kSupportIdLifetimeTag[] = "support-id-lifetime";
}
RegisterSupportHostRequest::RegisterSupportHostRequest(
SignalStrategy* signal_strategy,
scoped_refptr<RsaKeyPair> key_pair,
const std::string& directory_bot_jid,
const RegisterCallback& callback)
: signal_strategy_(signal_strategy),
key_pair_(key_pair),
directory_bot_jid_(directory_bot_jid),
callback_(callback) {
DCHECK(signal_strategy_);
DCHECK(key_pair_.get());
signal_strategy_->AddListener(this);
iq_sender_.reset(new IqSender(signal_strategy_));
}
RegisterSupportHostRequest::~RegisterSupportHostRequest() {
if (signal_strategy_)
signal_strategy_->RemoveListener(this);
}
void RegisterSupportHostRequest::OnSignalStrategyStateChange(
SignalStrategy::State state) {
if (state == SignalStrategy::CONNECTED) {
DCHECK(!callback_.is_null());
request_ = iq_sender_->SendIq(
buzz::STR_SET, directory_bot_jid_,
CreateRegistrationRequest(signal_strategy_->GetLocalJid()),
base::Bind(&RegisterSupportHostRequest::ProcessResponse,
base::Unretained(this)));
} else if (state == SignalStrategy::DISCONNECTED) {
// We will reach here if signaling fails to connect.
std::string error_message = "Signal strategy disconnected.";
LOG(ERROR) << error_message;
CallCallback(std::string(), base::TimeDelta(), error_message);
}
}
bool RegisterSupportHostRequest::OnSignalStrategyIncomingStanza(
const buzz::XmlElement* stanza) {
return false;
}
scoped_ptr<XmlElement> RegisterSupportHostRequest::CreateRegistrationRequest(
const std::string& jid) {
scoped_ptr<XmlElement> query(new XmlElement(
QName(kChromotingXmlNamespace, kRegisterQueryTag)));
XmlElement* public_key = new XmlElement(
QName(kChromotingXmlNamespace, kPublicKeyTag));
public_key->AddText(key_pair_->GetPublicKey());
query->AddElement(public_key);
query->AddElement(CreateSignature(jid).release());
return query;
}
scoped_ptr<XmlElement> RegisterSupportHostRequest::CreateSignature(
const std::string& jid) {
scoped_ptr<XmlElement> signature_tag(new XmlElement(
QName(kChromotingXmlNamespace, kSignatureTag)));
int64_t time = static_cast<int64_t>(base::Time::Now().ToDoubleT());
std::string time_str(base::Int64ToString(time));
signature_tag->AddAttr(
QName(kChromotingXmlNamespace, kSignatureTimeAttr), time_str);
std::string message = NormalizeJid(jid) + ' ' + time_str;
std::string signature(key_pair_->SignMessage(message));
signature_tag->AddText(signature);
return signature_tag;
}
void RegisterSupportHostRequest::ParseResponse(const XmlElement* response,
std::string* support_id,
base::TimeDelta* lifetime,
std::string* error_message) {
std::ostringstream error;
std::string type = response->Attr(buzz::QN_TYPE);
if (type == buzz::STR_ERROR) {
error << "Received error in response to heartbeat: " << response->Str();
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
// This method must only be called for error or result stanzas.
if (type != buzz::STR_RESULT) {
error << "Received unexpect stanza of type \"" << type << "\"";
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
const XmlElement* result_element = response->FirstNamed(QName(
kChromotingXmlNamespace, kRegisterQueryResultTag));
if (!result_element) {
error << "<" << kRegisterQueryResultTag
<< "> is missing in the host registration response: "
<< response->Str();
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
const XmlElement* support_id_element =
result_element->FirstNamed(QName(kChromotingXmlNamespace, kSupportIdTag));
if (!support_id_element) {
error << "<" << kSupportIdTag
<< "> is missing in the host registration response: "
<< response->Str();
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
const XmlElement* lifetime_element =
result_element->FirstNamed(QName(kChromotingXmlNamespace,
kSupportIdLifetimeTag));
if (!lifetime_element) {
error << "<" << kSupportIdLifetimeTag
<< "> is missing in the host registration response: "
<< response->Str();
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
int lifetime_int;
if (!base::StringToInt(lifetime_element->BodyText().c_str(), &lifetime_int) ||
lifetime_int <= 0) {
error << "<" << kSupportIdLifetimeTag
<< "> is malformed in the host registration response: "
<< response->Str();
*error_message = error.str();
LOG(ERROR) << *error_message;
return;
}
*support_id = support_id_element->BodyText();
*lifetime = base::TimeDelta::FromSeconds(lifetime_int);
return;
}
void RegisterSupportHostRequest::ProcessResponse(IqRequest* request,
const XmlElement* response) {
std::string support_id;
base::TimeDelta lifetime;
std::string error_message;
ParseResponse(response, &support_id, &lifetime, &error_message);
CallCallback(support_id, lifetime, error_message);
}
void RegisterSupportHostRequest::CallCallback(
const std::string& support_id,
base::TimeDelta lifetime,
const std::string& error_message) {
// Cleanup state before calling the callback.
request_.reset();
iq_sender_.reset();
signal_strategy_->RemoveListener(this);
signal_strategy_ = nullptr;
base::ResetAndReturn(&callback_).Run(support_id, lifetime, error_message);
}
} // namespace remoting
|
