app.js

const express = require('express')
const app = express()
const coce = require('./coce')

app.listen(coce.config.port)

app.get('/', function (req, res) {
    res.send('Welcome')
})

const isbnRE = /([0-9X]{10,13})/

app.get('/cover', (req, res) => {
    let ids = req.query.id;
    const api_key = req.query.api_key;
    if( !api_key || api_key !== process.env.API_KEY ) {
        return res.status(401).json( { error: 'Unauthorized'} )
    }
    if (ids === undefined || ids.length < 8) {
        var fail = {}
        fail.error = "ID parameter is missing"
        res.send(fail)
        return
    }
    ids = ids.split(',')
    if (ids.length === 0) {
        var fail = {}
        fail.error = "Bad id parameter"
        res.send(fail)
        return
    }
    let providers = req.query.provider
    providers = providers == undefined ? coce.config.providers : providers.split(',')
    const callback = req.query.callback

    var fetcher = new coce.CoceFetcher()
    fetcher.fetch(ids, providers, function (url) {
        if (req.query.all === undefined) {
            // Not &all param: URL are picked up by provider priority order
            // Just the first available url
            var ret = {}
            for (var id in url)
                for (var j = 0, provider; provider = providers[j]; j++) {
                    var u = url[id][provider]
                    if (u !== undefined) {
                        ret[id] = u;
                        break;
                    }
                }
            url = ret
        }
        if (callback) {
            res.contentType("application/javascript")
            url = callback + '(' + JSON.stringify(url) + ')'
        } else {
            res.contentType("application/json")
        }
        res.send(url)
    })
})