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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* Sketchy HTTP client
* (C) 2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/http_util.h>
#include <botan/parsing.h>
#include <botan/hex.h>
#include <botan/internal/stl_util.h>
#include <sstream>
#if defined(BOTAN_HAS_BOOST_ASIO)
#include <boost/asio.hpp>
#endif
namespace Botan {
namespace HTTP {
#if defined(BOTAN_HAS_BOOST_ASIO)
std::string http_transact_asio(const std::string& hostname,
const std::string& message)
{
using namespace boost::asio::ip;
boost::asio::ip::tcp::iostream tcp;
tcp.connect(hostname, "http");
if(!tcp)
throw std::runtime_error("HTTP connection to " + hostname + " failed");
tcp << message;
tcp.flush();
std::ostringstream oss;
oss << tcp.rdbuf();
return oss.str();
}
#endif
std::string http_transact_fail(const std::string& hostname,
const std::string&)
{
throw std::runtime_error("Cannot connect to " + hostname +
": network code disabled in build");
}
std::string url_encode(const std::string& in)
{
std::ostringstream out;
for(auto c : in)
{
if(c >= 'A' && c <= 'Z')
out << c;
else if(c >= 'a' && c <= 'z')
out << c;
else if(c >= '0' && c <= '9')
out << c;
else if(c == '-' || c == '_' || c == '.' || c == '~')
out << c;
else
out << '%' << hex_encode(reinterpret_cast<byte*>(&c), 1);
}
return out.str();
}
std::ostream& operator<<(std::ostream& o, const Response& resp)
{
o << "HTTP " << resp.status_code() << " " << resp.status_message() << "\n";
for(auto h : resp.headers())
o << "Header '" << h.first << "' = '" << h.second << "'\n";
o << "Body " << std::to_string(resp.body().size()) << " bytes:\n";
o.write(reinterpret_cast<const char*>(&resp.body()[0]), resp.body().size());
return o;
}
Response http_sync(http_exch_fn http_transact,
const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
const auto protocol_host_sep = url.find("://");
if(protocol_host_sep == std::string::npos)
throw std::runtime_error("Invalid URL " + url);
const std::string protocol = url.substr(0, protocol_host_sep);
const auto host_loc_sep = url.find('/', protocol_host_sep + 3);
std::string hostname, loc;
if(host_loc_sep == std::string::npos)
{
hostname = url.substr(protocol_host_sep + 3, std::string::npos);
loc = "/";
}
else
{
hostname = url.substr(protocol_host_sep + 3, host_loc_sep-protocol_host_sep-3);
loc = url.substr(host_loc_sep, std::string::npos);
}
std::ostringstream outbuf;
outbuf << verb << " " << loc << " HTTP/1.0\r\n";
outbuf << "Host: " << hostname << "\r\n";
if(verb == "GET")
{
outbuf << "Accept: */*\r\n";
outbuf << "Cache-Control: no-cache\r\n";
}
else if(verb == "POST")
outbuf << "Content-Length: " << body.size() << "\r\n";
if(content_type != "")
outbuf << "Content-Type: " << content_type << "\r\n";
outbuf << "Connection: close\r\n\r\n";
outbuf.write(reinterpret_cast<const char*>(&body[0]), body.size());
std::istringstream io(http_transact(hostname, outbuf.str()));
std::string line1;
std::getline(io, line1);
if(!io || line1.empty())
throw std::runtime_error("No response");
std::stringstream response_stream(line1);
std::string http_version;
unsigned int status_code;
std::string status_message;
response_stream >> http_version >> status_code;
std::getline(response_stream, status_message);
if(!response_stream || http_version.substr(0,5) != "HTTP/")
throw std::runtime_error("Not an HTTP response");
std::map<std::string, std::string> headers;
std::string header_line;
while (std::getline(io, header_line) && header_line != "\r")
{
auto sep = header_line.find(": ");
if(sep == std::string::npos || sep > header_line.size() - 2)
throw std::runtime_error("Invalid HTTP header " + header_line);
const std::string key = header_line.substr(0, sep);
if(sep + 2 < header_line.size() - 1)
{
const std::string val = header_line.substr(sep + 2, (header_line.size() - 1) - (sep + 2));
headers[key] = val;
}
}
if(status_code == 301 && headers.count("Location"))
{
if(allowable_redirects == 0)
throw std::runtime_error("HTTP redirection count exceeded");
return GET_sync(headers["Location"], allowable_redirects - 1);
}
std::vector<byte> resp_body;
std::vector<byte> buf(4096);
while(io.good())
{
io.read(reinterpret_cast<char*>(&buf[0]), buf.size());
resp_body.insert(resp_body.end(), &buf[0], &buf[io.gcount()]);
}
const std::string header_size = search_map(headers, std::string("Content-Length"));
if(header_size != "")
{
if(resp_body.size() != to_u32bit(header_size))
throw std::runtime_error("Content-Length disagreement, header says " +
header_size + " got " + std::to_string(resp_body.size()));
}
return Response(status_code, status_message, resp_body, headers);
}
Response http_sync(const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
return http_sync(
#if defined(BOTAN_HAS_BOOST_ASIO)
http_transact_asio,
#else
http_transact_fail,
#endif
verb,
url,
content_type,
body,
allowable_redirects);
}
Response GET_sync(const std::string& url, size_t allowable_redirects)
{
return http_sync("GET", url, "", std::vector<byte>(), allowable_redirects);
}
Response POST_sync(const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
return http_sync("POST", url, content_type, body, allowable_redirects);
}
std::future<Response> GET_async(const std::string& url, size_t allowable_redirects)
{
return std::async(std::launch::async, GET_sync, url, allowable_redirects);
}
}
}
|
