mirror of
https://github.com/servo/servo.git
synced 2025-06-12 10:24:43 +00:00
97 lines
3.2 KiB
Rust
97 lines
3.2 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 std::future::Future;
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use std::pin::Pin;
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use data_url::forgiving_base64;
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use headers::{ContentType, HeaderMapExt};
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use http::StatusCode;
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use mime::Mime;
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use net_traits::request::Request;
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use net_traits::response::{Response, ResponseBody};
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use net_traits::{NetworkError, ResourceFetchTiming};
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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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use crate::fetch::methods::{DoneChannel, FetchContext};
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use crate::protocols::ProtocolHandler;
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#[derive(Default)]
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pub struct DataProtocolHander {}
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enum DecodeError {
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InvalidDataUri,
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NonBase64DataUri,
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}
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type DecodeData = (Mime, Vec<u8>);
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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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impl ProtocolHandler for DataProtocolHander {
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fn load(
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&self,
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request: &mut Request,
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_done_chan: &mut DoneChannel,
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_context: &FetchContext,
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) -> Pin<Box<dyn Future<Output = Response> + Send>> {
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let url = request.current_url();
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let response = match decode(&url) {
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Ok((mime, bytes)) => {
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let mut response =
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Response::new(url, ResourceFetchTiming::new(request.timing_type()));
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*response.body.lock().unwrap() = ResponseBody::Done(bytes);
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response.headers.typed_insert(ContentType::from(mime));
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response.status = Some((StatusCode::OK, "OK".to_string()));
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response.raw_status = Some((StatusCode::OK.as_u16(), b"OK".to_vec()));
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response
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},
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Err(_) => {
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Response::network_error(NetworkError::Internal("Decoding data URL failed".into()))
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},
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};
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Box::pin(std::future::ready(response))
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}
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}
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