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html: escape user provided attribute values

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This commit is contained in:
Noah Hellman 2023-01-30 22:48:34 +01:00
parent f9655dfa9b
commit 8dd4db11ec
1 changed files with 38 additions and 35 deletions
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73
src/html.rs
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@ -167,7 +167,9 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
if dst.is_empty() {
self.out.write_str("<a")?;
} else {
write!(self.out, r#"<a href="{}""#, dst)?;
self.out.write_str(r#"<a href=""#)?;
self.write_escape(dst)?;
self.out.write_char('"')?;
}
}
Container::Image(..) => {
@ -193,7 +195,9 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
}
for (a, v) in attrs.iter().filter(|(a, _)| *a != "class") {
write!(self.out, r#" {}="{}""#, a, v)?;
write!(self.out, r#" {}=""#, a)?;
self.write_escape(v)?;
self.out.write_char('"')?;
}
if let Container::Heading {
@ -204,7 +208,9 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
| Container::Section { id } = &c
{
if !attrs.iter().any(|(a, _)| a == "id") {
write!(self.out, r#" id="{}""#, id)?;
self.out.write_str(r#" id=""#)?;
self.write_escape(id)?;
self.out.write_char('"')?;
}
}
@ -271,7 +277,9 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
}
Container::CodeBlock { lang } => {
if let Some(l) = lang {
write!(self.out, r#"><code class="language-{}">"#, l)?;
self.out.write_str(r#"><code class="language-"#)?;
self.write_escape(l)?;
self.out.write_str(r#"">"#)?;
} else {
self.out.write_str("><code>")?;
}
@ -381,37 +389,11 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
Container::Mark => self.out.write_str("</mark>")?,
}
}
Event::Str(s) => {
let mut s: &str = s.as_ref();
match self.raw {
Raw::None => {
let mut ent = "";
while let Some(i) = s.chars().position(|c| {
if let Some(s) = match c {
'<' => Some("&lt;"),
'>' => Some("&gt;"),
'&' => Some("&amp;"),
_ => None,
} {
ent = s;
true
} else {
false
}
}) {
self.out.write_str(&s[..i])?;
self.out.write_str(ent)?;
s = &s[i + 1..];
}
self.out.write_str(s)?;
}
Raw::Html => {
self.out.write_str(s)?;
}
Raw::Other => {}
}
}
Event::Str(s) => match self.raw {
Raw::None => self.write_escape(&s)?,
Raw::Html => self.out.write_str(&s)?,
Raw::Other => {}
},
Event::Atom(a) => match a {
Atom::FootnoteReference(_tag, number) => {
write!(
@ -441,4 +423,25 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
self.out.write_char('\n')?;
Ok(())
}
fn write_escape(&mut self, mut s: &str) -> std::fmt::Result {
let mut ent = "";
while let Some(i) = s.find(|c| {
match c {
'<' => Some("&lt;"),
'>' => Some("&gt;"),
'&' => Some("&amp;"),
_ => None,
}
.map_or(false, |s| {
ent = s;
true
})
}) {
self.out.write_str(&s[..i])?;
self.out.write_str(ent)?;
s = &s[i + 1..];
}
self.out.write_str(s)
}
}