mirror of
https://github.com/arfct/itty-bitty.git
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52 lines
2.5 KiB
JavaScript
52 lines
2.5 KiB
JavaScript
export default async (request, context) => {
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let url = new URL(request.url);
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let path = url.pathname;
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const useragent = request.headers.get("user-agent");
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let metadataBots = [ "Twitterbot", "curl", "facebookexternalhit", "Slackbot-LinkExpanding", "Discordbot"]
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let isMetadataBot = metadataBots.some(bot => useragent.indexOf(bot) != -1);
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if (isMetadataBot) {
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let components = path.substring(1).split("/");
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let info = {}
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info.title = decodeURIComponent(components.shift()).replace(/-/g, " ").replace(/–/g, "-");
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let i;
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for (i = 0; i < components.length; i+=2) {
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let key = components[i];
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let value = decodeURIComponent(components[i+1]);
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if (key.length && value.length) info[key] = value;
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}
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info.d = info.d?.replace(/-/g, " ").replace(/–/g, "-");
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let content = ['<meta charset="UTF-8">'];
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if (info.title) { content.push(`<title>${info.title}</title>`,`<meta property="og:title" content="${info.title}"/>`); }
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if (info.s) { content.push(`<meta property="og:site_name" content="${info.s}"/>`); }
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if (info.t) { content.push(`<meta property="og:type" content="${info.t}"/>`); }
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if (info.d) { content.push(`<meta property="og:description" content="${info.d}"/>`,`<meta name="description" content="${info.d}"/>`); }
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if (info.i) {
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if (!info.i.startsWith("http")) info.i = atob(info.i);
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content.push(`<meta property="og:image" content="${info.i}"/>`);
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if (info.iw) content.push(`<meta property="og:image:width" content="${info.iw}"/>`);
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if (info.ih) content.push(`<meta property="og:image:width" content="${info.ih}"/>`);
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}
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if (info.v) {
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if (!info.v.startsWith("http")) info.v = atob(info.v);
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content.push(`<meta property="og:video" content="${info.v}"/>`);
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if (info.vw) content.push(`<meta property="og:image:width" content="${info.vw}"/>`);
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if (info.vh) content.push(`<meta property="og:image:width" content="${info.vh}"/>`);
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}
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if (info.f) {
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if (info.f.length > 9){
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if (!info.f.startsWith("http")) info.f = atob(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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context.log(info, content);
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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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}
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