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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::{Mime, TopLevel, SubLevel, Attr, Value};
use mime_classifier::MIMEClassifier;
use net_traits::ProgressMsg::{Done, Payload};
use net_traits::{LoadConsumer, LoadData, Metadata};
use resource_task::{CancellationListener, send_error, start_sending_sniffed_opt};
use rustc_serialize::base64::FromBase64;
use std::sync::Arc;
use url::SchemeData;
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 task.
// 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 task, if desired.
load(load_data, senders, classifier, cancel_listener)
}
pub fn load(load_data: LoadData,
start_chan: LoadConsumer,
classifier: Arc<MIMEClassifier>,
cancel_listener: CancellationListener) {
let url = load_data.url;
assert!(&*url.scheme == "data");
// Split out content type and data.
let mut scheme_data = match url.scheme_data {
SchemeData::NonRelative(ref scheme_data) => scheme_data.clone(),
_ => panic!("Expected a non-relative scheme URL.")
};
match url.query {
Some(ref query) => {
scheme_data.push_str("?");
scheme_data.push_str(query);
},
None => ()
}
let parts: Vec<&str> = scheme_data.splitn(2, ',').collect();
if parts.len() != 2 {
send_error(url, "invalid data uri".to_owned(), start_chan);
return;
}
// ";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 is_base64 = false;
let mut ct_str = parts[0].to_owned();
if ct_str.ends_with(";base64") {
is_base64 = true;
let end_index = ct_str.len() - 7;
ct_str.truncate(end_index);
}
if ct_str.starts_with(";charset=") {
ct_str = format!("text/plain{}", ct_str);
}
// Parse the content type using rust-http.
// FIXME: this can go into an infinite loop! (rust-http #25)
let mut content_type: Option<Mime> = ct_str.parse().ok();
if content_type == None {
content_type = Some(Mime(TopLevel::Text, SubLevel::Plain,
vec!((Attr::Charset, Value::Ext("US-ASCII".to_owned())))));
}
if cancel_listener.is_cancelled() {
return;
}
let bytes = percent_decode(parts[1].as_bytes());
let bytes = if is_base64 {
// FIXME(#2909): It’s unclear what to do with non-alphabet characters,
// but Acid 3 apparently depends on spaces being ignored.
let bytes = bytes.into_iter().filter(|&b| b != ' ' as u8).collect::<Vec<u8>>();
match bytes.from_base64() {
Err(..) => return send_error(url, "non-base64 data uri".to_owned(), start_chan),
Ok(data) => data,
}
} else {
bytes
};
let mut metadata = Metadata::default(url);
metadata.set_content_type(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(())));
}
}
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