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
#[macro_use]
extern crate log;
extern crate http;
extern crate httparse;
extern crate scoped_threadpool;
pub use http::Request;
pub use http::response::{Builder, Response, Parts};
pub use http::status::{InvalidStatusCode, StatusCode};
pub use http::method::Method;
use http::response::Builder as ResponseBuilder;
use scoped_threadpool::Pool;
use std::fs::File;
use std::io::prelude::*;
use std::net::{TcpListener, TcpStream};
use std::path::Path;
mod error;
pub use error::Error;
pub struct Server {
handler: fn(Request<&[u8]>, ResponseBuilder) -> Result<Response<&[u8]>, Error>,
}
impl Server {
pub fn new(
handler: fn(Request<&[u8]>, ResponseBuilder) -> Result<Response<&[u8]>, Error>,
) -> Server {
Server { handler }
}
pub fn listen(&self, host: &str, port: &str) {
let mut pool = Pool::new(4);
let listener =
TcpListener::bind(format!("{}:{}", host, port)).expect("Error starting the server.");
info!("Server started at http://{}:{}", host, port);
for stream in listener.incoming() {
let stream = stream.expect("Error handling TCP stream.");
pool.scoped(|scope| {
scope.execute(|| {
self.handle_connection(stream).expect(
"Error handling connection.",
);
});
});
}
}
fn handle_connection(&self, mut stream: TcpStream) -> Result<(), Error> {
let mut buffer = [0; 512];
stream.read(&mut buffer)?;
let request = parse_request(&buffer)?;
let mut response_builder = Response::builder();
let fs_path = format!("public{}", request.uri());
if fs_path.contains("./") || fs_path.contains("../") {
response_builder.status(StatusCode::NOT_FOUND);
let response = response_builder
.body("<h1>404</h1><p>Not found!<p>".as_bytes())
.unwrap();
write_response(response, stream)?;
return Ok(());
}
if Path::new(&fs_path).is_file() {
let mut f = File::open(&fs_path)?;
let mut source = Vec::new();
f.read_to_end(&mut source)?;
let response = response_builder.body(&*source)?;
write_response(response, stream)?;
return Ok(());
}
let response = (self.handler)(request, response_builder).unwrap_or_else(|_| {
let mut response_builder = Response::builder();
response_builder.status(StatusCode::INTERNAL_SERVER_ERROR);
response_builder
.body("<h1>500</h1><p>Internal Server Error!<p>".as_bytes())
.unwrap()
});
Ok(write_response(response, stream)?)
}
}
fn write_response(response: Response<&[u8]>, mut stream: TcpStream) -> Result<(), Error> {
let text =
format!(
"HTTP/1.1 {} {}\r\n\r\n",
response.status().as_str(),
response.status().canonical_reason().unwrap(),
);
stream.write(text.as_bytes())?;
stream.write(response.body())?;
Ok(stream.flush()?)
}
fn parse_request(raw_request: &[u8]) -> Result<Request<&[u8]>, Error> {
let mut headers = [httparse::EMPTY_HEADER; 16];
let mut req = httparse::Request::new(&mut headers);
let header_length = req.parse(raw_request)?.unwrap() as usize;
let body = &raw_request[header_length..];
let mut http_req = Request::builder();
for header in req.headers {
http_req.header(header.name, header.value);
}
let mut request = http_req.body(body)?;
let path = req.path.unwrap();
*request.uri_mut() = path.parse()?;
Ok(request)
}