Ignore case when looking for iTunes extension namespace

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 2.x.x - Unreleased
 
 - Update `chrono` to 0.4.31 [`#160`](https://github.com/rust-syndication/rss/pull/160)
+- Change how iTunes extension is detected. Use case insensitive comparison of a namespace [`#159`](https://github.com/rust-syndication/rss/pull/159)
 
 ## 2.0.6 - 2023-08-12
 

src/channel.rs

@@ -21,7 +21,7 @@ use crate::error::Error;
 #[cfg(feature = "atom")]
 use crate::extension::atom;
 use crate::extension::dublincore;
-use crate::extension::itunes;
+use crate::extension::itunes::{self, is_itunes_namespace};
 use crate::extension::syndication;
 use crate::extension::util::{
     extension_entry, extension_name, parse_extension_element, read_namespace_declarations,
@@ -1299,8 +1299,11 @@ impl Channel {
                                 Some(ns @ atom::NAMESPACE) => {
                                     extension_entry(&mut extensions, ns, name).push(ext);
                                 }
-                                Some(ns @ itunes::NAMESPACE)
-                                | Some(ns @ dublincore::NAMESPACE)
+                                Some(ns) if is_itunes_namespace(ns) => {
+                                    extension_entry(&mut extensions, itunes::NAMESPACE, name)
+                                        .push(ext);
+                                }
+                                Some(ns @ dublincore::NAMESPACE)
                                 | Some(ns @ syndication::NAMESPACE) => {
                                     extension_entry(&mut extensions, ns, name).push(ext);
                                 }

src/extension/itunes/mod.rs

@@ -22,6 +22,14 @@ pub use self::itunes_owner::*;
 /// The iTunes XML namespace.
 pub const NAMESPACE: &str = "http://www.itunes.com/dtds/podcast-1.0.dtd";
 
+/// Formally XML namespace is case sensitive and this should be just an equality check.
+/// But many podcast publishers ignore this and use different case variations of the namespace.
+/// Hence this check is relaxed and ignores a case.
+#[inline]
+pub(crate) fn is_itunes_namespace(ns: &str) -> bool {
+    ns.eq_ignore_ascii_case(NAMESPACE)
+}
+
 fn parse_image(map: &mut BTreeMap<String, Vec<Extension>>) -> Option<String> {
     let mut element = match map.remove("image").map(|mut v| v.remove(0)) {
         Some(element) => element,

src/item.rs

@@ -20,7 +20,7 @@ use crate::error::Error;
 #[cfg(feature = "atom")]
 use crate::extension::atom;
 use crate::extension::dublincore;
-use crate::extension::itunes;
+use crate::extension::itunes::{self, is_itunes_namespace};
 use crate::extension::util::{
     extension_entry, extension_name, parse_extension_element, read_namespace_declarations,
 };
@@ -660,7 +660,11 @@ impl Item {
                                 Some(ns @ atom::NAMESPACE) => {
                                     extension_entry(&mut extensions, ns, name).push(ext);
                                 }
-                                Some(ns @ itunes::NAMESPACE) | Some(ns @ dublincore::NAMESPACE) => {
+                                Some(ns) if is_itunes_namespace(ns) => {
+                                    extension_entry(&mut extensions, itunes::NAMESPACE, name)
+                                        .push(ext);
+                                }
+                                Some(ns @ dublincore::NAMESPACE) => {
                                     extension_entry(&mut extensions, ns, name).push(ext);
                                 }
                                 _ => extension_entry(&mut item.extensions, prefix, name).push(ext),