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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::future::Future;
use std::pin::Pin;
use data_url::forgiving_base64;
use headers::{ContentType, HeaderMapExt};
use http::StatusCode;
use mime::Mime;
use net_traits::request::Request;
use net_traits::response::{Response, ResponseBody};
use net_traits::{NetworkError, ResourceFetchTiming};
use percent_encoding::percent_decode;
use servo_url::ServoUrl;
use url::Position;
use crate::fetch::methods::{DoneChannel, FetchContext};
use crate::protocols::ProtocolHandler;
#[derive(Default)]
pub struct DataProtocolHander {}
enum DecodeError {
InvalidDataUri,
NonBase64DataUri,
}
type DecodeData = (Mime, Vec<u8>);
fn decode(url: &ServoUrl) -> Result<DecodeData, DecodeError> {
// data_url could do all of this work for us,
// except that it currently (Nov 2019) parses mime types into a
// different Mime class than other code expects
assert_eq!(url.scheme(), "data");
// Split out content type and data.
let parts: Vec<&str> = url[Position::BeforePath..Position::AfterQuery]
.splitn(2, ',')
.collect();
if parts.len() != 2 {
return Err(DecodeError::InvalidDataUri);
}
// ";base64" must come at the end of the content type, per RFC 2397.
// rust-http will fail to parse it because there's no =value part.
let mut ct_str = parts[0];
let is_base64 = ct_str.ends_with(";base64");
if is_base64 {
ct_str = &ct_str[..ct_str.len() - ";base64".len()];
}
let ct_str = if ct_str.starts_with(";charset=") {
format!("text/plain{}", ct_str)
} else {
ct_str.to_owned()
};
let content_type = ct_str
.parse()
.unwrap_or_else(|_| "text/plain; charset=US-ASCII".parse().unwrap());
let mut bytes = percent_decode(parts[1].as_bytes()).collect::<Vec<_>>();
if is_base64 {
match forgiving_base64::decode_to_vec(&bytes) {
Err(..) => return Err(DecodeError::NonBase64DataUri),
Ok(data) => bytes = data,
}
}
Ok((content_type, bytes))
}
impl ProtocolHandler for DataProtocolHander {
fn load(
&self,
request: &mut Request,
_done_chan: &mut DoneChannel,
_context: &FetchContext,
) -> Pin<Box<dyn Future<Output = Response> + Send>> {
let url = request.current_url();
let response = match decode(&url) {
Ok((mime, bytes)) => {
let mut response =
Response::new(url, ResourceFetchTiming::new(request.timing_type()));
*response.body.lock().unwrap() = ResponseBody::Done(bytes);
response.headers.typed_insert(ContentType::from(mime));
response.status = Some((StatusCode::OK, "OK".to_string()));
response.raw_status = Some((StatusCode::OK.as_u16(), b"OK".to_vec()));
response
},
Err(_) => {
Response::network_error(NetworkError::Internal("Decoding data URL failed".into()))
},
};
Box::pin(std::future::ready(response))
}
}
|
