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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 http://mozilla.org/MPL/2.0/. */
use hyper::mime::{Attr, Mime, SubLevel, TopLevel, Value};
use mime_classifier::MimeClassifier;
use net_traits::{LoadData, Metadata, NetworkError};
use net_traits::LoadConsumer;
use net_traits::ProgressMsg::{Done, Payload};
use resource_thread::{CancellationListener, send_error, start_sending_sniffed_opt};
use rustc_serialize::base64::FromBase64;
use std::sync::Arc;
use url::{Position, Url};
use url::percent_encoding::percent_decode;
pub fn factory(load_data: LoadData,
senders: LoadConsumer,
classifier: Arc<MimeClassifier>,
cancel_listener: CancellationListener) {
// NB: we don't spawn a new thread.
// Hypothesis: data URLs are too small for parallel base64 etc. to be worth it.
// Should be tested at some point.
// Left in separate function to allow easy moving to a thread, if desired.
load(load_data, senders, classifier, cancel_listener)
}
pub enum DecodeError {
InvalidDataUri,
NonBase64DataUri,
}
pub type DecodeData = (Mime, Vec<u8>);
pub fn decode(url: &Url) -> Result<DecodeData, DecodeError> {
assert!(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(|_| {
Mime(TopLevel::Text, SubLevel::Plain,
vec![(Attr::Charset, Value::Ext("US-ASCII".to_owned()))])
});
let mut bytes = percent_decode(parts[1].as_bytes()).collect::<Vec<_>>();
if is_base64 {
// FIXME(#2909): It’s unclear what to do with non-alphabet characters,
// but Acid 3 apparently depends on spaces being ignored.
bytes = bytes.into_iter().filter(|&b| b != ' ' as u8).collect::<Vec<u8>>();
match bytes.from_base64() {
Err(..) => return Err(DecodeError::NonBase64DataUri),
Ok(data) => bytes = data,
}
}
Ok((content_type, bytes))
}
pub fn load(load_data: LoadData,
start_chan: LoadConsumer,
classifier: Arc<MimeClassifier>,
cancel_listener: CancellationListener) {
let url = load_data.url;
if cancel_listener.is_cancelled() {
return;
}
match decode(&url) {
Ok((content_type, bytes)) => {
let mut metadata = Metadata::default(url);
metadata.set_content_type(Some(content_type).as_ref());
if let Ok(chan) = start_sending_sniffed_opt(start_chan,
metadata,
classifier,
&bytes,
load_data.context) {
let _ = chan.send(Payload(bytes));
let _ = chan.send(Done(Ok(())));
}
},
Err(DecodeError::InvalidDataUri) =>
send_error(url, NetworkError::Internal("invalid data uri".to_owned()), start_chan),
Err(DecodeError::NonBase64DataUri) =>
send_error(url, NetworkError::Internal("non-base64 data uri".to_owned()), start_chan),
}
}
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