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
use mime::Mime;
use once_cell::sync::Lazy;
use crate::http::errors::*;
use crate::http::{guess_accept_mime, header, Request, Response, StatusCode};
use crate::Depot;
static SUPPORTED_FORMATS: Lazy<Vec<mime::Name>> = Lazy::new(|| vec![mime::JSON, mime::HTML, mime::XML, mime::PLAIN]);
const EMPTY_DETAIL_MSG: &str = "there is no more detailed explanation";
pub trait Catcher: Send + Sync + 'static {
fn catch(&self, req: &Request, depot: &Depot, res: &mut Response) -> bool;
}
fn http_error_html(code: StatusCode, name: &str, summary: Option<&str>, detail: Option<&str>) -> String {
format!(
r#"<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>{0}: {1}</title>
<style>
:root {{
--bg-color: #fff;
--text-color: #222;
}}
body {{
background: var(--bg-color);
color: var(--text-color);
text-align: center;
}}
footer{{text-align:center;}}
@media (prefers-color-scheme: dark) {{
:root {{
--bg-color: #222;
--text-color: #ddd;
}}
a:link {{ color: red; }}
a:visited {{ color: #a8aeff; }}
a:hover {{color: #a8aeff;}}
a:active {{color: #a8aeff;}}
}}
</style>
</head>
<body>
<div>
<h1>{0}: {1}</h1>{2}{3}<hr />
<footer><a href="https://salvo.rs" target="_blank">salvo</a></footer>
</div>
</body>
</html>"#,
code.as_u16(),
name,
summary
.map(|summary| format!("<h3>{}</h3>", summary))
.unwrap_or_default(),
format_args!("<p>{}</p>", detail.unwrap_or(EMPTY_DETAIL_MSG)),
)
}
fn http_error_json(code: StatusCode, name: &str, summary: Option<&str>, detail: Option<&str>) -> String {
format!(
r#"{{"error":{{"code":{},"name":"{}","summary":"{}","detail":"{}"}}}}"#,
code.as_u16(),
name,
summary.unwrap_or(name),
detail.unwrap_or(EMPTY_DETAIL_MSG)
)
}
fn http_error_plain(code: StatusCode, name: &str, summary: Option<&str>, detail: Option<&str>) -> String {
format!(
"code:{},\nname:{},\nsummary:{},\ndetail:{}",
code.as_u16(),
name,
summary.unwrap_or(name),
detail.unwrap_or(EMPTY_DETAIL_MSG)
)
}
fn http_error_xml(code: StatusCode, name: &str, summary: Option<&str>, detail: Option<&str>) -> String {
format!(
"<error><code>{}</code><name>{}</name><summary>{}</summary><detail>{}</detail></error>",
code.as_u16(),
name,
summary.unwrap_or(name),
detail.unwrap_or(EMPTY_DETAIL_MSG)
)
}
pub fn http_error_bytes(err: &HttpError, prefer_format: &Mime) -> (Mime, Vec<u8>) {
let format = if !SUPPORTED_FORMATS.contains(&prefer_format.subtype()) {
"text/html".parse().unwrap()
} else {
prefer_format.clone()
};
let content = match format.subtype().as_ref() {
"plain" => http_error_plain(err.code, &err.name, err.summary.as_deref(), err.detail.as_deref()),
"json" => http_error_json(err.code, &err.name, err.summary.as_deref(), err.detail.as_deref()),
"xml" => http_error_xml(err.code, &err.name, err.summary.as_deref(), err.detail.as_deref()),
_ => http_error_html(err.code, &err.name, err.summary.as_deref(), err.detail.as_deref()),
};
(format, content.as_bytes().to_owned())
}
pub struct CatcherImpl(StatusCode);
impl CatcherImpl {
pub fn new(code: StatusCode) -> CatcherImpl {
CatcherImpl(code)
}
}
impl Catcher for CatcherImpl {
fn catch(&self, req: &Request, _depot: &Depot, res: &mut Response) -> bool {
let status = res.status_code().unwrap_or(StatusCode::NOT_FOUND);
if status != self.0 {
return false;
}
let format = guess_accept_mime(req, None);
let (format, data) = if res.http_error.is_some() {
http_error_bytes(res.http_error.as_ref().unwrap(), &format)
} else {
http_error_bytes(&crate::http::errors::HttpError::from_code(self.0).unwrap(), &format)
};
res.headers_mut()
.insert(header::CONTENT_TYPE, format.to_string().parse().unwrap());
res.write_body_bytes(&data);
true
}
}
macro_rules! default_catchers {
($($code:expr),+) => (
let list: Vec<Box<dyn Catcher>> = vec![
$(
Box::new(CatcherImpl::new($code)),
)+];
list
)
}
pub mod defaults {
use super::{Catcher, CatcherImpl};
use http::status::StatusCode;
pub fn get() -> Vec<Box<dyn Catcher>> {
default_catchers! {
StatusCode::BAD_REQUEST,
StatusCode::UNAUTHORIZED,
StatusCode::PAYMENT_REQUIRED,
StatusCode::FORBIDDEN,
StatusCode::NOT_FOUND,
StatusCode::METHOD_NOT_ALLOWED,
StatusCode::NOT_ACCEPTABLE,
StatusCode::PROXY_AUTHENTICATION_REQUIRED,
StatusCode::REQUEST_TIMEOUT,
StatusCode::CONFLICT,
StatusCode::GONE,
StatusCode::LENGTH_REQUIRED,
StatusCode::PRECONDITION_FAILED,
StatusCode::PAYLOAD_TOO_LARGE,
StatusCode::URI_TOO_LONG,
StatusCode::UNSUPPORTED_MEDIA_TYPE,
StatusCode::RANGE_NOT_SATISFIABLE,
StatusCode::EXPECTATION_FAILED,
StatusCode::IM_A_TEAPOT,
StatusCode::MISDIRECTED_REQUEST,
StatusCode::UNPROCESSABLE_ENTITY,
StatusCode::LOCKED,
StatusCode::FAILED_DEPENDENCY,
StatusCode::UPGRADE_REQUIRED,
StatusCode::PRECONDITION_REQUIRED,
StatusCode::TOO_MANY_REQUESTS,
StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE,
StatusCode::UNAVAILABLE_FOR_LEGAL_REASONS,
StatusCode::INTERNAL_SERVER_ERROR,
StatusCode::NOT_IMPLEMENTED,
StatusCode::BAD_GATEWAY,
StatusCode::SERVICE_UNAVAILABLE,
StatusCode::GATEWAY_TIMEOUT,
StatusCode::HTTP_VERSION_NOT_SUPPORTED,
StatusCode::VARIANT_ALSO_NEGOTIATES,
StatusCode::INSUFFICIENT_STORAGE,
StatusCode::LOOP_DETECTED,
StatusCode::NOT_EXTENDED,
StatusCode::NETWORK_AUTHENTICATION_REQUIRED
}
}
}
