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worker.js
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worker.js
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addEventListener("fetch", (event) => {
event.respondWith(
handleRequest(event.request).catch(
(err) => new Response(err.stack, { status: 500 })
)
);
});
function escape(unsafe) {
return unsafe
.replaceAll("&", "&")
.replaceAll("<", "<")
.replaceAll(">", ">")
.replaceAll('"', """)
.replaceAll("'", "'");
}
async function handleRequest(request) {
const { searchParams, href } = new URL(request.url);
const targetUrl = new URL(searchParams.get("url"));
const itemSelector = searchParams.get("item");
const titleSelector = searchParams.get("title");
const descriptionSelector = searchParams.get("description");
const linkSelector = searchParams.get("link");
const pubDateSelector = searchParams.get("pubDate");
const items = [];
let item;
let title = "";
let description = "";
const res = await fetch(targetUrl);
await new HTMLRewriter()
.on("head title", {
text(text) {
title += text.text;
},
})
.on('head meta[name="description"]', {
text(text) {
description += text.text;
},
})
.on(itemSelector, {
element() {
item = {
title: "",
description: "",
link: "",
pubDate: "",
};
items.push(item);
},
})
.on(`${itemSelector} ${titleSelector}`, {
text(text) {
item.title += text.text;
},
})
.on(`${itemSelector} ${descriptionSelector}`, {
text(text) {
item.description += text.text;
},
})
.on(`${itemSelector} ${linkSelector}`, {
element(element) {
item.link = element.getAttribute("href");
// Make links absolute
if (item.link?.startsWith("/")) {
item.link = `${targetUrl.origin}${item.link}`;
}
},
})
.on(`${itemSelector} ${pubDateSelector}`, {
text(text) {
item.pubDate += text.text;
if (text.lastInTextNode && item.pubDate) {
item.pubDate = new Date(item.pubDate).toUTCString();
}
},
})
.transform(res)
.arrayBuffer();
const lastBuildDate = (
items.map((item) => new Date(item.pubDate)).sort((a, b) => b - a)[0] ||
new Date()
).toUTCString();
const rss = `
<?xml version="1.0" encoding="UTF-8" ?>
<rss xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:atom="http://www.w3.org/2005/Atom"
version="2.0">
<channel>
<title><![CDATA[${title}]]></title>
<description><![CDATA[${description}]]></description>
<link>${targetUrl}</link>
<atom:link href="${escape(href)}" rel="alternate" type="application/rss+xml" />
<generator>vkrae-rss-generator</generator>
<lastBuildDate>${lastBuildDate}</lastBuildDate>
${items
.map(
(item) => `
<item>
<title><![CDATA[${item.title.trim()}]]></title>
<description><![CDATA[${item.description.trim()}]]></description>
<link>${item.link.trim()}</link>
<guid isPermaLink="true">${item.link}</guid>
<pubDate>${item.pubDate}</pubDate>
</item>`
)
.join("\n")}
</channel>
</rss>
`.trim();
return new Response(rss, {
headers: new Headers({
"Content-Type": "text/xml",
charset: "utf-8",
}),
});
}