fix: fixing rss by cleaning invalid characters (#492)

* fix: fixing rss by cleaning invalid characters

* style: format code for consistency in rss.xml.ts

---------

Co-authored-by: L4Ph <4ranci0ne@gmail.com>

src/pages/rss.xml.ts

@@ -7,6 +7,14 @@ import sanitizeHtml from "sanitize-html";
 
 const parser = new MarkdownIt();
 
+function stripInvalidXmlChars(str: string): string {
+	return str.replace(
+		// biome-ignore lint/suspicious/noControlCharactersInRegex: https://www.w3.org/TR/xml/#charsets
+		/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F\uFDD0-\uFDEF\uFFFE\uFFFF]/g,
+		"",
+	);
+}
+
 export async function GET(context: APIContext) {
 	const blog = await getSortedPosts();
 
@@ -17,13 +25,13 @@ export async function GET(context: APIContext) {
 		items: blog.map((post) => {
 			const content =
 				typeof post.body === "string" ? post.body : String(post.body || "");
-
+			const cleanedContent = stripInvalidXmlChars(content);
 			return {
 				title: post.data.title,
 				pubDate: post.data.published,
 				description: post.data.description || "",
 				link: `/posts/${post.slug}/`,
-				content: sanitizeHtml(parser.render(content), {
+				content: sanitizeHtml(parser.render(cleanedContent), {
 					allowedTags: sanitizeHtml.defaults.allowedTags.concat(["img"]),
 				}),
 			};