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
|
//! # crimp
//!
//! This library provides a simplified API over the [cURL Rust
//! bindings][] that resemble that of higher-level libraries such as
//! [reqwest][].
//!
//! `crimp` is intended to be used in situations where HTTP client
//! functionality is desired without adding a significant number of
//! dependencies or sacrificing too much usability.
//!
//! [cURL Rust bindings]: https://docs.rs/curl
//! [reqwest]: https://docs.rs/reqwest
extern crate curl;
use curl::easy::{Easy, List, ReadError};
use std::collections::HashMap;
use std::io::Write;
use std::string::{FromUtf8Error, ToString};
type CurlResult<T> = Result<T, curl::Error>;
/// HTTP method to use for the request.
pub enum Method {
Get, Post, Put, Patch, Delete
}
pub struct Request<'a> {
handle: Easy,
headers: List,
body: Option<&'a [u8]>,
}
#[derive(Debug)]
pub struct CurlResponse<T> {
pub status: u32,
pub headers: HashMap<String, String>,
pub body: T,
}
impl <'a> Request<'a> {
/// Initiate an HTTP request with the given method and URL.
pub fn new(method: Method, url: &str) -> CurlResult<Self> {
let mut handle = Easy::new();
handle.url(url)?;
match method {
Method::Get => handle.get(true)?,
Method::Post => handle.post(true)?,
Method::Put => handle.put(true)?,
Method::Patch => handle.custom_request("PATCH")?,
Method::Delete => handle.custom_request("DELETE")?,
}
Ok(Request {
handle,
headers: List::new(),
body: None,
})
}
/// Add a header to a request.
pub fn header(&mut self, k: &str, v: &str) -> CurlResult<&mut Self> {
self.headers.append(&format!("{}: {}", k, v))?;
Ok(self)
}
/// Set the User-Agent for this request.
pub fn user_agent(&mut self, agent: &str) -> CurlResult<&mut Self> {
self.handle.useragent(agent)?;
Ok(self)
}
/// Add a byte-array body to a request using the specified
/// Content-Type.
pub fn body(&'a mut self, content_type: &str, body: &'a [u8])
-> CurlResult<&mut Self> {
self.header("Content-Type", content_type)?;
self.body = Some(body);
Ok(self)
}
/// Send the HTTP request and return a response structure
/// containing the raw body.
pub fn send(mut self) -> CurlResult<CurlResponse<Vec<u8>>> {
// Create structures in which to store the response data:
let mut headers = HashMap::new();
let mut body = vec![];
{
// Take a scoped transfer from the Easy handle. This makes it
// possible to write data into the above local buffers without
// fighting the borrow-checker:
let mut transfer = self.handle.transfer();
// Write the payload if it exists:
if let Some(body) = self.body {
transfer.read_function(move |mut into| {
into.write_all(body)
.map(|_| body.len())
.map_err(|_| ReadError::Abort)
})?;
}
// Read one header per invocation. Request processing is
// terminated if any header is malformed:
transfer.header_function(|header| {
// Headers are expected to be valid UTF-8 data. If they
// are not, the conversion is lossy.
//
// Technically it is legal for HTTP requests to use
// different encodings, but we don't interface with such
// services for hygienic reasons.
let header = String::from_utf8_lossy(header);
let split = header.splitn(2, ':').collect::<Vec<_>>();
// "Malformed" headers are skipped. In most cases this
// will only be the HTTP version statement.
if split.len() != 2 {
return true;
}
headers.insert(
split[0].trim().to_string(), split[1].trim().to_string()
);
true
})?;
// Read the body to the allocated buffer.
transfer.write_function(|data| {
let len = data.len();
body.write_all(data)
.map(|_| len)
.map_err(|err| panic!("{:?}", err))
})?;
transfer.perform()?;
}
Ok(CurlResponse {
status: self.handle.response_code()?,
headers,
body
})
}
}
impl CurlResponse<Vec<u8>> {
/// Attempt to parse the HTTP response body as a UTF-8 encoded
/// string.
pub fn as_string(self) -> Result<CurlResponse<String>, FromUtf8Error> {
let body = String::from_utf8(self.body)?;
Ok(CurlResponse {
body,
status: self.status,
headers: self.headers,
})
}
}
|
