Remove customised implementation of hsts headers. (#30046)

This looks to have originally been implemented due to missing functionality in the headers crate, which has since been added and released.

components/net/hsts.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use embedder_traits::resources::{self, Resource};
-use headers::{Header, HeaderMapExt, HeaderName, HeaderValue};
+use headers::{HeaderMapExt, StrictTransportSecurity};
 use http::HeaderMap;
 use net_traits::pub_domains::reg_suffix;
 use net_traits::IncludeSubdomains;
@@ -187,18 +187,20 @@ impl HstsList {
 
         if let Some(header) = headers.typed_get::<StrictTransportSecurity>() {
             if let Some(host) = url.domain() {
-                let include_subdomains = if header.include_subdomains {
+                let include_subdomains = if header.include_subdomains() {
                     IncludeSubdomains::Included
                 } else {
                     IncludeSubdomains::NotIncluded
                 };
 
-                if let Some(entry) =
+                if let Some(entry) = HstsEntry::new(
-                    HstsEntry::new(host.to_owned(), include_subdomains, Some(header.max_age))
+                    host.to_owned(),
-                {
+                    include_subdomains,
+                    Some(header.max_age().as_secs()),
+                ) {
                     info!("adding host {} to the strict transport security list", host);
-                    info!("- max-age {}", header.max_age);
+                    info!("- max-age {}", header.max_age().as_secs());
-                    if header.include_subdomains {
+                    if header.include_subdomains() {
                         info!("- includeSubdomains");
                     }
 
@@ -208,89 +210,3 @@ impl HstsList {
         }
     }
 }
-
-// TODO: Remove this with the next update of the `headers` crate
-// https://github.com/hyperium/headers/issues/61
-#[derive(Clone, Debug, PartialEq)]
-struct StrictTransportSecurity {
-    include_subdomains: bool,
-    max_age: u64,
-}
-
-enum Directive {
-    MaxAge(u64),
-    IncludeSubdomains,
-    Unknown,
-}
-
-// taken from https://github.com/hyperium/headers
-impl Header for StrictTransportSecurity {
-    fn name() -> &'static HeaderName {
-        &http::header::STRICT_TRANSPORT_SECURITY
-    }
-
-    fn decode<'i, I: Iterator<Item = &'i HeaderValue>>(
-        values: &mut I,
-    ) -> Result<Self, headers::Error> {
-        values
-            .just_one()
-            .and_then(|v| v.to_str().ok())
-            .map(|s| {
-                s.split(';')
-                    .map(str::trim)
-                    .map(|sub| {
-                        if sub.eq_ignore_ascii_case("includeSubDomains") {
-                            Some(Directive::IncludeSubdomains)
-                        } else {
-                            let mut sub = sub.splitn(2, '=');
-                            match (sub.next(), sub.next()) {
-                                (Some(left), Some(right))
-                                    if left.trim().eq_ignore_ascii_case("max-age") =>
-                                {
-                                    right
-                                        .trim()
-                                        .trim_matches('"')
-                                        .parse()
-                                        .ok()
-                                        .map(Directive::MaxAge)
-                                },
-                                _ => Some(Directive::Unknown),
-                            }
-                        }
-                    })
-                    .fold(Some((None, None)), |res, dir| match (res, dir) {
-                        (Some((None, sub)), Some(Directive::MaxAge(age))) => Some((Some(age), sub)),
-                        (Some((age, None)), Some(Directive::IncludeSubdomains)) => {
-                            Some((age, Some(())))
-                        },
-                        (Some((Some(_), _)), Some(Directive::MaxAge(_))) |
-                        (Some((_, Some(_))), Some(Directive::IncludeSubdomains)) |
-                        (_, None) => None,
-                        (res, _) => res,
-                    })
-                    .and_then(|res| match res {
-                        (Some(age), sub) => Some(StrictTransportSecurity {
-                            max_age: age,
-                            include_subdomains: sub.is_some(),
-                        }),
-                        _ => None,
-                    })
-                    .ok_or_else(headers::Error::invalid)
-            })
-            .unwrap_or_else(|| Err(headers::Error::invalid()))
-    }
-
-    fn encode<E: Extend<HeaderValue>>(&self, _values: &mut E) {}
-}
-
-trait IterExt: Iterator {
-    fn just_one(&mut self) -> Option<Self::Item> {
-        let one = self.next()?;
-        match self.next() {
-            Some(_) => None,
-            None => Some(one),
-        }
-    }
-}
-
-impl<T: Iterator> IterExt for T {}