CallHubAPIs.js

hub-service-api.js

const https = require('https')
const crypto = require('crypto')

const hubUrl = 'xxx.azure-devices.net'
const path = '/devices?api-version=2020-09-30'
const key = 'xxxxxxxxxxxx'

const generateSasToken = (resourceUri, signingKey, policyName, expiresInMins) => {
    resourceUri = encodeURIComponent(resourceUri);

    // Set expiration in seconds
    var expires = (Date.now() / 1000) + expiresInMins * 60;
    expires = Math.ceil(expires);
    var toSign = resourceUri + '\n' + expires;

    // Use crypto
    var hmac = crypto.createHmac('sha256', Buffer.from(signingKey, 'base64'));
    hmac.update(toSign);
    var base64UriEncoded = encodeURIComponent(hmac.digest('base64'));

    // Construct authorization string
    var token = "SharedAccessSignature sr=" + resourceUri + "&sig="
    + base64UriEncoded + "&se=" + expires;
    if (policyName) token += "&skn="+policyName;
    return token;
};

const options = {
    hostname: hubUrl,
    port: 443,
    path: path,
    method: 'GET',
    headers: {
        Authorization: generateSasToken(`${hubUrl}/${path}`, key, 'iothubowner', 60)
    }
}

const req = https.request(options, res => {
    console.log(`statusCode: ${res.statusCode}`)
    let body = ''
    res.on('data', d => {
        //process.stdout.write(d)
        body += d
    })

    res.on('end', () => {
        const json = JSON.parse(body)
        console.log(json)
    })
})

req.on('error', error => {
    console.error(error)
})
    
const data =  '{"query":"SELECT deviceId, FROM devices"}'
// req.write(data)
req.end()