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
|
#include "response.h"
#include "file.h"
#include <boost/algorithm/string/predicate.hpp>
#include <functional>
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std::placeholders;
namespace {
class RequestContext
{
private:
request_type& m_req;
std::string m_host;
std::string m_target;
Server& m_server;
const Path& m_path;
public:
RequestContext(request_type& req, Server& server)
: m_req(req)
, m_host(req["host"])
, m_target(req.target())
, m_server(server)
, m_path(server.GetConfig().GetPath(server.GetSocket(), m_host, m_target))
{
}
const Path& GetPath() const {return m_path;}
std::string GetPluginName() const {return m_path.params.at("plugin");} // can throw std::out_of_range
std::string GetPluginPath() const {return m_path.requested;}
std::string GetDocRoot() const {return m_path.params.at("target");} // can throw std::out_of_range
std::string GetRelativePath() const { // can throw std::runtime_error
if (!boost::starts_with(m_target, m_path.requested))
throw std::runtime_error("Mismatch of target ("s + m_target + ") and plugin path(" + m_path.requested + ")"s);
return m_target.substr(m_path.requested.size());
}
std::string GetPluginParam(const std::string& key) const {return m_path.params.at(key);} // can throw std::out_of_range
plugin_type GetPlugin() const {return m_server.GetPlugin(m_path.params.at("plugin"));}; // can throw std::out_of_range
request_type& GetReq() const {return m_req;}
std::string GetTarget() const {return m_target;}
};
std::string extend_index_html(std::string path)
{
if (path.size() && path.back() == '/')
path.append("index.html");
return path;
}
std::string GetServerParam(const std::string& key, Server& server)
{
// following are the supported fields:
// ...
throw std::runtime_error("Unsupported server param: "s + key);
}
std::unordered_map<std::string, std::function<std::string(RequestContext&)>> GetRequestParamFunctions{
// following are the supported fields:
{"target", [](RequestContext& req_ctx) {return req_ctx.GetTarget();}},
{"rel_target", [](RequestContext& req_ctx) {return req_ctx.GetRelativePath();}},
{"doc_root", [](RequestContext& req_ctx) { return req_ctx.GetDocRoot();}},
{"body", [](RequestContext& req_ctx) { return req_ctx.GetReq().body(); }},
{"method", [](RequestContext& req_ctx) { return std::string{req_ctx.GetReq().method_string()};}},
};
std::string GetRequestParam(const std::string& key, RequestContext& req_ctx)
{
// first, look up functions from GetRequestParamFunctions
{
auto it = GetRequestParamFunctions.find(key);
if (it != GetRequestParamFunctions.end())
return it->second(req_ctx);
}
// second, look up plugin parameters
{
try {
return req_ctx.GetPluginParam(key);
} catch(const std::out_of_range& ex) {
// not found
};
}
// third, look up req parameters
{
try {
return std::string{req_ctx.GetReq()[key]};
} catch(...){
// not found
}
}
// otherwise: error
throw std::runtime_error("Unsupported request param: "s + key);
}
void SetResponseHeader(const std::string& key, const std::string& value, response_type& res)
{
// following are the supported fields:
if (key == "status") { // HTTP Status, e.g. "200" (OK)
res.result(unsigned(stoul(value)));
} else if (key == "server") { // Server name/version string
res.set(http::field::server, value);
} else if (key == "content_type") { // e.g. text/html
res.set(http::field::content_type, value);
} else
throw std::runtime_error("Unsupported response field: "s + key);
}
// Return a reasonable mime type based on the extension of a file.
beast::string_view
mime_type(beast::string_view path)
{
using beast::iequals;
auto const ext = [&path]
{
auto const pos = path.rfind(".");
if (pos == beast::string_view::npos)
return beast::string_view{};
return path.substr(pos);
}();
if(iequals(ext, ".htm")) return "text/html";
if(iequals(ext, ".html")) return "text/html";
if(iequals(ext, ".php")) return "text/html";
if(iequals(ext, ".css")) return "text/css";
if(iequals(ext, ".txt")) return "text/plain";
if(iequals(ext, ".js")) return "application/javascript";
if(iequals(ext, ".json")) return "application/json";
if(iequals(ext, ".xml")) return "application/xml";
if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
if(iequals(ext, ".flv")) return "video/x-flv";
if(iequals(ext, ".png")) return "image/png";
if(iequals(ext, ".jpe")) return "image/jpeg";
if(iequals(ext, ".jpeg")) return "image/jpeg";
if(iequals(ext, ".jpg")) return "image/jpeg";
if(iequals(ext, ".gif")) return "image/gif";
if(iequals(ext, ".bmp")) return "image/bmp";
if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
if(iequals(ext, ".tiff")) return "image/tiff";
if(iequals(ext, ".tif")) return "image/tiff";
if(iequals(ext, ".svg")) return "image/svg+xml";
if(iequals(ext, ".svgz")) return "image/svg+xml";
return "application/text";
}
// Used to return errors by generating response page and HTTP status code
response_type HttpStatus(std::string status, std::string message, response_type& res)
{
res.result(unsigned(stoul(status)));
res.set(http::field::content_type, "text/html");
res.body() = "<html><body><h1>"s + VersionString + " Error</h1><p>"s + status + " "s + message + "</p></body></html>"s;
res.prepare_payload();
return res;
}
} // anonymous namespace
response_type generate_response(request_type& req, Server& server)
{
response_type res{http::status::ok, req.version()};
res.set(http::field::server, VersionString);
res.set(http::field::content_type, mime_type(extend_index_html(std::string(req.target()))));
res.keep_alive(req.keep_alive());
try {
RequestContext req_ctx{req, server}; // can throw std::out_of_range
plugin_type plugin{req_ctx.GetPlugin()};
auto GetServerParamFunction {std::function<std::string(const std::string& key)>(std::bind(GetServerParam, _1, std::ref(server)))};
auto GetRequestParamFunction {std::function<std::string(const std::string& key)>(std::bind(GetRequestParam, _1, std::ref(req_ctx)))};
auto SetResponseHeaderFunction{std::function<void(const std::string& key, const std::string& value)>(std::bind(SetResponseHeader, _1, _2, std::ref(res)))};
std::string res_data { plugin->generate_page(GetServerParamFunction, GetRequestParamFunction, SetResponseHeaderFunction)};
if (req.method() == http::verb::head) {
res.content_length(res_data.size());
} else {
res.body() = res_data;
res.prepare_payload();
}
return res;
} catch(const std::out_of_range& ex) {
return HttpStatus("400", "Bad request: Host "s + std::string{req["host"]} + ":"s + std::string{req.target()} + " unknown"s, res);
}
}
|
