javascript 适用于Firebase的Cloud功能，用于在Facebook中共享内容

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const functions = require('firebase-functions')
const admin = require('firebase-admin')
admin.initializeApp()
const firestore = admin.firestore()

exports.fbProductShare = functions.https.onRequest((req, res) => {
    
    const params = req.query
    const ref = firestore.collection('products').doc(params.id).get()
    ref.then(querySnapshot => {

        const title = querySnapshot.data().name
        const description = querySnapshot.data().description
        const image = querySnapshot.data().image //could be the Firebase Storage Download URL

        // Replace this by your own url
        const url = `https://yourapp.firebaseapp.com/routeToArticle/id`
        
        const content = `
        <html>
        <head>
        <title>${title}</title>
        <meta property="og:url"                content="${url}" />
        <meta property="og:type"               content="article" />
        <meta property="og:title"              content="${title}" />
        <meta property="og:description"        content="${description}" />
        <meta property="og:image"              content="${image}" />
        </head>
        <body>
        <script>
        window.location = '${url}'
        </script>
        </body>
        </html>
        `
        
        res.status(200).send(content)
    })
})

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