mirror of
https://github.com/arfct/itty-bitty.git
synced 2026-03-11 08:54:33 +00:00
92 lines
3.9 KiB
JavaScript
92 lines
3.9 KiB
JavaScript
function decodePrettyComponent(s) {
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let replacements = {'---': ' - ', '--': '-','-' : ' '}
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return decodeURIComponent(s.replace(/-+/g, e => replacements[e] ?? '-'))
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}
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function decodeURL(s) {
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if (s.startsWith("http")) return s;
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return atob(s.replace(/=/g,''));
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}
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function atou(b64) { return decodeURIComponent(escape(atob(b64))); }
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function utoa(data) { return btoa(unescape(encodeURIComponent(data))); }
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function pathToMetadata(path) {
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let components = path.substring(1).split("/");
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let info = {title: decodePrettyComponent(components.shift())}
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for (let i = 0; i < components.length; i+=2) {
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let key = components[i];
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let value = components[i+1];
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if (!value) continue;
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if (key == "d") { value = decodePrettyComponent(value); }
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else if (value.includes("%")) { value = decodeURIComponent(value); }
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if (key.length && value.length) info[key] = value;
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}
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return info;
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}
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function mProp(prop, content) { return `<meta property="${prop}" content="${content}"/>` }
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function mName(name, content) { return `<meta name="${name}" content="${content}"/>` }
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// Valid URL Chars A-Za-z0-9-._~:?@!$&()*;=+/
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export default async (request, context) => {
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try {
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const ua = request.headers.get("user-agent");
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let url = new URL(request.url);
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let path = url.pathname;
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let geo = context?.geo?.city + ", " + context?.geo?.subdivision?.code + ", " + context?.geo?.country?.code
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let uaArray = Deno.env.get("UA_ARRAY")?.split(",") || [];
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let uaMatch = uaArray.some(a => ua?.indexOf(a) != -1);
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if (uaMatch) { return new Response('', { status: 401 }); }
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if (path != "/" ) {
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let metadataBots = [ "Twitterbot", "curl", "facebookexternalhit", "Slackbot-LinkExpanding", "Discordbot", "snapchat", "Googlebot"]
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let isMetadataBot = metadataBots.some(bot => ua?.indexOf(bot) != -1);
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if (isMetadataBot && path.endsWith("/")) {
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let info = pathToMetadata(path)
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let content = ['<meta charset="UTF-8">'];
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if (info.title) { content.push(`<title>${info.title}</title>`,mProp("og:title", info.title)) }
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if (info.s) { content.push(mProp("og:site_name", info.s)) }
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if (info.t) { content.push(mProp("og:type", info.t)) }
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if (info.d) { content.push(mProp("og:description", info.d),mName("description",info.d)) }
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if (info.c) { content.push(mName("theme-color","#" + info.c)) }
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if (info.i) {
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info.i = decodeURL(info.i)
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if (!info.i.startsWith("http")) info.i = "/.netlify/functions/rasterize/" + info.i
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content.push(mProp("og:image", info.i));
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if (info.iw) content.push(mProp("og:image:width", info.iw));
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if (info.ih) content.push(mProp("og:image:width", info.ih));
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content.push(mName("twitter:card", "summary_large_image"));
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}
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if (info.v) {
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content.push(mProp("og:video", decodeURL(info.v)));
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if (info.vw) content.push(mProp("og:image:width", info.vw));
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if (info.vh) content.push(mProp("og:image:width", info.vh));
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}
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if (info.f) { // Favicon: URL Encoded
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if (info.f.length > 9){
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info.f = decodeURL(info.f);
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content.push(`<link rel="icon" type="image/png" href="${info.f}">`);
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} else {
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let codepoints = Array.from(info.f).map(c => c.codePointAt(0).toString(16));
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content.push(`<link rel="icon" type="image/png" href="https://fonts.gstatic.com/s/e/notoemoji/14.0/${codepoints.join("_")}/128.png">`);
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}
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}
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// content.push(mProp("og:url", request.url)`);
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console.log(["Metadata Request", JSON.stringify(info), geo, ua].join('\t'));
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return new Response(content.join("\n"), {
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headers: { "content-type": "text/html" },
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});
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}
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} else {
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console.log(["Request", path, geo, request.headers.get("referer"), ua].join('\t'));
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}
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} catch (e) {
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console.log("Error:", request.url, e)
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}
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}
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