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Issue #7393: Properly sniff mislabeled feeds.

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This commit is contained in:
Simon Martin 2015-08-30 00:15:23 +02:00
parent 67cbda4be3
commit 5301e59965
7 changed files with 52 additions and 6 deletions
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21
components/net/mime_classifier.rs
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@ -125,6 +125,10 @@ impl <'a, T: Iterator<Item=&'a u8> + Clone> Matches for T {
// Side effects
// moves the iterator when match is found
fn matches(&mut self, matches: &[u8]) -> bool {
if self.clone().nth(matches.len()).is_none() {
// there are less than matches.len() elements in self
return false
}
let result = self.clone().zip(matches).all(|(s, m)| *s == *m);
if result {
self.nth(matches.len());
@ -381,9 +385,10 @@ where T: Iterator<Item=&'a u8> + Clone {
struct FeedsClassifier;
impl FeedsClassifier {
// Implements sniffing for mislabeled feeds (https://mimesniff.spec.whatwg.org/#sniffing-a-mislabeled-feed)
fn classify_impl(&self, data: &[u8]) -> Option<(&'static str, &'static str)> {
// can not be feed unless length is > 3
// Step 4: can not be feed unless length is > 3
if data.len() < 3 {
return None;
}
@ -403,6 +408,7 @@ impl FeedsClassifier {
return None;
}
// Steps 5.2.1 to 5.2.4
match eats_until(&mut matcher, b"?", b"?>")
.chain(|| eats_until(&mut matcher, b"!--", b"-->"))
.chain(|| eats_until(&mut matcher, b"!", b">")) {
@ -411,20 +417,23 @@ impl FeedsClassifier {
Match::Start => return None
}
// Step 5.2.5
if matcher.matches(b"rss") {
return Some(("application", "rss+xml"));
}
// Step 5.2.6
if matcher.matches(b"feed") {
return Some(("application", "atom+xml"));
}
if matcher.matches(b"rdf: RDF") {
// Step 5.2.7
if matcher.matches(b"rdf:RDF") {
while matcher.next().is_some() {
match eats_until(&mut matcher,
b"http: //purl.org/rss/1.0/",
b"http: //www.w3.org/1999/02/22-rdf-syntax-ns#")
b"http://purl.org/rss/1.0/",
b"http://www.w3.org/1999/02/22-rdf-syntax-ns#")
.chain(|| eats_until(&mut matcher,
b"http: //www.w3.org/1999/02/22-rdf-syntax-ns#",
b"http: //purl.org/rss/1.0/")) {
b"http://www.w3.org/1999/02/22-rdf-syntax-ns#",
b"http://purl.org/rss/1.0/")) {
Match::StartAndEnd => return Some(("application", "rss+xml")),
Match::DidNotMatch => {},
Match::Start => return None