mirror of
https://github.com/servo/servo.git
synced 2025-06-13 10:54:29 +00:00
57 lines
1.8 KiB
Rust
57 lines
1.8 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use data_url::forgiving_base64;
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use mime::Mime;
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use percent_encoding::percent_decode;
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use servo_url::ServoUrl;
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use url::Position;
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pub enum DecodeError {
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InvalidDataUri,
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NonBase64DataUri,
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}
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pub type DecodeData = (Mime, Vec<u8>);
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pub fn decode(url: &ServoUrl) -> Result<DecodeData, DecodeError> {
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// data_url could do all of this work for us,
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// except that it currently (Nov 2019) parses mime types into a
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// different Mime class than other code expects
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assert_eq!(url.scheme(), "data");
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// Split out content type and data.
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let parts: Vec<&str> = url[Position::BeforePath..Position::AfterQuery]
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.splitn(2, ',')
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.collect();
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if parts.len() != 2 {
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return Err(DecodeError::InvalidDataUri);
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}
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// ";base64" must come at the end of the content type, per RFC 2397.
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// rust-http will fail to parse it because there's no =value part.
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let mut ct_str = parts[0];
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let is_base64 = ct_str.ends_with(";base64");
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if is_base64 {
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ct_str = &ct_str[..ct_str.len() - ";base64".len()];
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}
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let ct_str = if ct_str.starts_with(";charset=") {
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format!("text/plain{}", ct_str)
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} else {
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ct_str.to_owned()
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};
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let content_type = ct_str
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.parse()
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.unwrap_or_else(|_| "text/plain; charset=US-ASCII".parse().unwrap());
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let mut bytes = percent_decode(parts[1].as_bytes()).collect::<Vec<_>>();
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if is_base64 {
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match forgiving_base64::decode_to_vec(&bytes) {
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Err(..) => return Err(DecodeError::NonBase64DataUri),
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Ok(data) => bytes = data,
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}
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}
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Ok((content_type, bytes))
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}
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