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Updated edge function metadata handling

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Nicholas Jitkoff 2022-05-28 23:46:34 -07:00
parent b128e04b54
commit 2f55ea247c
1 changed files with 63 additions and 44 deletions
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107
netlify/edge-functions/index.js
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@ -1,52 +1,71 @@
export default async (request, context) => {
const ua = request.headers.get("user-agent");
let url = new URL(request.url);
let path = url.pathname;
const useragent = request.headers.get("user-agent");
let metadataBots = [ "Twitterbot", "curl", "facebookexternalhit", "Slackbot-LinkExpanding", "Discordbot"]
let isMetadataBot = metadataBots.some(bot => useragent.indexOf(bot) != -1);
if (isMetadataBot) {
let components = path.substring(1).split("/");
let info = {}
info.title = decodeURIComponent(components.shift()).replace(/-/g, " ").replace(/–/g, "-");
let i;
for (i = 0; i < components.length; i+=2) {
let key = components[i];
let value = decodeURIComponent(components[i+1]);
if (key.length && value.length) info[key] = value;
}
info.d = info.d?.replace(/-/g, " ").replace(/–/g, "-");
let content = ['<meta charset="UTF-8">'];
if (info.title) { content.push(`<title>${info.title}</title>`,`<meta property="og:title" content="${info.title}"/>`); }
if (info.s) { content.push(`<meta property="og:site_name" content="${info.s}"/>`); }
if (info.t) { content.push(`<meta property="og:type" content="${info.t}"/>`); }
if (info.d) { content.push(`<meta property="og:description" content="${info.d}"/>`,`<meta name="description" content="${info.d}"/>`); }
if (info.i) {
if (!info.i.startsWith("http")) info.i = atob(info.i);
content.push(`<meta property="og:image" content="${info.i}"/>`);
if (info.iw) content.push(`<meta property="og:image:width" content="${info.iw}"/>`);
if (info.ih) content.push(`<meta property="og:image:width" content="${info.ih}"/>`);
}
if (info.v) {
if (!info.v.startsWith("http")) info.v = atob(info.v);
content.push(`<meta property="og:video" content="${info.v}"/>`);
if (info.vw) content.push(`<meta property="og:image:width" content="${info.vw}"/>`);
if (info.vh) content.push(`<meta property="og:image:width" content="${info.vh}"/>`);
}
if (info.f) {
if (info.f.length > 9){
if (!info.f.startsWith("http")) info.f = atob(info.f);
content.push(`<link rel="icon" type="image/png" href="${info.f}">`);
} else {
let codepoints = Array.from(info.f).map(c => c.codePointAt(0).toString(16));
content.push(`<link rel="icon" type="image/png" href="https://fonts.gstatic.com/s/e/notoemoji/14.0/${codepoints.join("_")}/128.png">`);
let uaArray = Deno.env.get("UA_ARRAY")?.split(",") || [];
let uaMatch = uaArray.some(a => ua.indexOf(a) != -1);
if (uaMatch) {
//console.log("Redirecting legacy client", context.geo.city + ", " + context.geo.subdivision.code)
return new Response('', { status: 401 });
}
if (path != "/" ) {
// context.log(request.headers, request.headers.get("user-agent"), request.headers.get("referer"), JSON.stringify(context.geo));
let metadataBots = [ "Twitterbot", "curl", "facebookexternalhit", "Slackbot-LinkExpanding", "Discordbot", "snapchat"]
let isMetadataBot = metadataBots.some(bot => ua.indexOf(bot) != -1);
if (isMetadataBot && path.endsWith("/")) {
let components = path.substring(1).split("/");
let info = {}
info.title = decodeURIComponent(components.shift()).replace(/-/g, " ").replace(/–/g, "-");
let i;
for (i = 0; i < components.length; i+=2) {
let key = components[i];
let value = decodeURIComponent(components[i+1]);
if (key.length && value.length) info[key] = value;
}
}
context.log(info, content);
info.d = info.d?.replace(/-/g, " ").replace(/–/g, "-");
return new Response(content.join("\n"), {
headers: { "content-type": "text/html" },
});
let content = ['<meta charset="UTF-8">'];
if (info.title) { content.push(`<title>${info.title}</title>`,`<meta property="og:title" content="${info.title}"/>`); }
if (info.s) { content.push(`<meta property="og:site_name" content="${info.s}"/>`); }
if (info.t) { content.push(`<meta property="og:type" content="${info.t}"/>`); }
if (info.d) { content.push(`<meta property="og:description" content="${info.d}"/>`,`<meta name="description" content="${info.d}"/>`); }
if (info.i) {
if (!info.i.startsWith("http")) info.i = atob(info.i);
content.push(`<meta property="og:image" content="${info.i}"/>`);
if (info.iw) content.push(`<meta property="og:image:width" content="${info.iw}"/>`);
if (info.ih) content.push(`<meta property="og:image:width" content="${info.ih}"/>`);
}
if (info.v) {
if (!info.v.startsWith("http")) info.v = atob(info.v);
content.push(`<meta property="og:video" content="${info.v}"/>`);
if (info.vw) content.push(`<meta property="og:image:width" content="${info.vw}"/>`);
if (info.vh) content.push(`<meta property="og:image:width" content="${info.vh}"/>`);
}
if (info.f) {
if (info.f.length > 9){
if (!info.f.startsWith("http")) info.f = atob(info.f);
content.push(`<link rel="icon" type="image/png" href="${info.f}">`);
} else {
let codepoints = Array.from(info.f).map(c => c.codePointAt(0).toString(16));
content.push(`<link rel="icon" type="image/png" href="https://fonts.gstatic.com/s/e/notoemoji/14.0/${codepoints.join("_")}/128.png">`);
}
}
context.log("Providing Metadata",ua, info, content);
return new Response(content.join("\n"), {
headers: { "content-type": "text/html" },
});
}
} else {
console.log("Request", path,
context.geo.city + ", " + context.geo.subdivision.code,
request.headers.get("referer"),
ua);
}
}