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/* 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 data_url::forgiving_base64;
use mime::Mime;
use percent_encoding::percent_decode;
use servo_url::ServoUrl;
use url::Position;
pub enum DecodeError {
InvalidDataUri,
NonBase64DataUri,
}
pub type DecodeData = (Mime, Vec<u8>);
pub 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))
}
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