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Firebase function for dynamic routing via redirect
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| 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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