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Updated metadata functions

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This commit is contained in:
Nicholas Jitkoff 2023-02-11 09:32:57 -07:00
parent 992a2ff62b
commit 37e4627911
2 changed files with 39 additions and 26 deletions
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6
netlify.toml
View file

@ -1,3 +1,9 @@
[functions]
external_node_modules = [
"sharp"
]
directory = "functions/"
[[edge_functions]]
path = "/*"
function = "metadata"

59
netlify/edge-functions/metadata.js
View file

@ -3,6 +3,14 @@ function decodePrettyComponent(s) {
return decodeURIComponent(s.replace(/-+/g, e => replacements[e] ?? '-'))
}
function decodeURL(s) {
if (s.startsWith("http")) return s;
return atob(s.replace(/=/g,''));
}
function atou(b64) { return decodeURIComponent(escape(atob(b64))); }
function utoa(data) { return btoa(unescape(encodeURIComponent(data))); }
function pathToMetadata(path) {
let components = path.substring(1).split("/");
let info = {title: decodePrettyComponent(components.shift())}
@ -17,6 +25,10 @@ function pathToMetadata(path) {
return info;
}
function mProp(prop, content) { return `<meta property="${prop}" content="${content}"/>` }
function mName(name, content) { return `<meta name="${name}" content="${content}"/>` }
// Valid URL Chars A-Za-z0-9-._~:?@!$&()*;=+/
export default async (request, context) => {
try {
const ua = request.headers.get("user-agent");
@ -26,14 +38,9 @@ export default async (request, context) => {
let uaArray = Deno.env.get("UA_ARRAY")?.split(",") || [];
let uaMatch = uaArray.some(a => ua.indexOf(a) != -1);
if (uaMatch) {
//console.log("Redirecting legacy client", )
return new Response('', { status: 401 });
}
if (uaMatch) { return new Response('', { status: 401 }); }
if (path != "/" ) {
// context.log(path, request.headers, geo);
let metadataBots = [ "Twitterbot", "curl", "facebookexternalhit", "Slackbot-LinkExpanding", "Discordbot", "snapchat"]
let isMetadataBot = metadataBots.some(bot => ua.indexOf(bot) != -1);
@ -41,37 +48,37 @@ export default async (request, context) => {
let info = pathToMetadata(path)
let content = ['<meta charset="UTF-8">'];
if (info.title) { content.push(`<title>${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="${info.d}"/>`); }
if (info.i) {
if (!info.i.startsWith("http")) info.i = atob(info.i.replace(/=/g,''));
content.push(`<meta property="og:image" content="${info.i}"/>`);
content.push(`<meta name="twitter:card" content="summary_large_image">`);
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.title) { content.push(`<title>${info.title}</title>`,mProp("og:title", info.title)) }
if (info.s) { content.push(mProp("og:site_name", info.s)) }
if (info.t) { content.push(mProp("og:type", info.t)) }
if (info.d) { content.push(mProp("og:description", info.d),mName("description",info.d)) }
if (info.c) { content.push(mName("theme-color","#" + info.c)) }
if (info.i) {
info.i = decodeURL(info.i)
if (!info.i.startsWith("http")) info.i = "/.netlify/functions/rasterize/" + info.i
content.push(mProp("og:image", info.i));
if (info.iw) content.push(mProp("og:image:width", info.iw));
if (info.ih) content.push(mProp("og:image:width", info.ih));
content.push(mName("twitter:card", "summary_large_image"));
}
if (info.c) { content.push(`<meta name="theme-color" content="#${info.c}"/>`); }
if (info.v) {
if (!info.v.startsWith("http")) info.v = atob(info.v.replace(/=/g,''));
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="${info.vh}"/>`);
if (info.v) {
content.push(mProp("og:video", decodeURL(info.v)));
if (info.vw) content.push(mProp("og:image:width", info.vw));
if (info.vh) content.push(mProp("og:image:width", info.vh));
}
if (info.f) {
if (info.f) { // Favicon: URL Encoded
if (info.f.length > 9){
if (!info.f.startsWith("http")) info.f = atob(info.f.replace(/=/g,''));
info.f = decodeURL(info.f);
content.push(`<link rel="icon" type="image/png" href="${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/${codepoints.join("_")}/128.png">`);
}
}
content.push(`<meta property="og:url" content="${request.url}" />`);
// content.push(mProp("og:url", request.url)`);
console.log(["Metadata Request", JSON.stringify(info), geo, ua].join('\t'));
return new Response(content.join("\n"), {
headers: { "content-type": "text/html" },
});