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@pejalo pejalo/post.js
Last active Nov 24, 2019

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Firebase function for dynamic routing via redirect
const admin = require('firebase-admin');
function buildHtmlWithPost (post) {
const title = post.title + ' | Example Website';
var head = {
title: title,
meta: [
// This may not be a valid combination of tags for the services you need to support;
// they're only shown here as an example.
{ property: 'og:title', content: title },
{ property: 'og:description', content: post.description },
{ property: 'og:image', content: post.imageURL },
{ property: 'twitter:title', content: title },
{ property: 'twitter:description', content: post.description },
{ property: 'twitter:image', content: post.imageURL }
],
link: [
{ rel: 'icon', 'href': 'https://example.com/favicon.png' },
],
};
// Is this crazy object-to-HTML parsing necessary? Of course not.
// We could have just declared one long HTML string. But alas
var string = '<!DOCTYPE html><head>';
Object.keys(head).forEach(key => {
if (typeof head[key] === 'string')
string += '<' + key + '>' + head[key] + '</' + key + '>';
else if (Array.isArray(head[key])) {
for (const obj of head[key]) {
string += '<' + key;
Object.keys(obj).forEach(key2 => {
string += ' ' + key2 + '="' + obj[key2] + '"';
});
string += '>';
}
}
});
string += '</head><body>';
string += '<script>window.location="https://example.com/?post=' + post.id + '";</script>';
string += '</body></html>';
return string;
}
module.exports = function(req, res) {
const path = req.path.split('/');
if (path.length < 3 || path[1] !== 'posts') {
res.status(404).send('Post not found :(');
return;
}
const postId = path[2];
admin.database().ref('/posts').child(postId).once('value').then(snapshot => {
const post = snapshot.val();
post.id = snapshot.key;
if (!post) {
res.status(404).send('Post not found :(');
return;
}
const htmlString = buildHtmlWithPost(post);
res.status(200).end(htmlString);
});
};
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