fcapi/index.js

cloud function computing api generator

module.exports = function (handler) {
    return async (req, res, context) => {
        try {
            if (req.method !== 'POST') throw 'Invalid method'
            if (!/json/i.test(req.headers['content-type'])) throw 'Invalid content'
            res.setHeader('content-type', 'application/json')

            const str = await read(req)
            const result = await handler(JSON.parse(str), context)
            res.send(JSON.stringify(
                typeof result === 'object' ? result : { data: result }
            ))
        } catch (err) {
            res.setStatusCode(500)
            res.send(JSON.stringify({
                message: err instanceof Error ? err.message : err
            }))
        }
    }
}

function read(req) {
    return new Promise((resolve, reject) => {
        req.on('error', reject)
        let arr = []
        req.on('data', r => arr.push(r))
        req.on('end', () => resolve(Buffer.concat(arr).toString('utf8')))
    })
}