MSTranslatorKey.js

//translator-key
// (for bing translator key generating api)
// Connect to MS api server using our key and return a short-term token to our caller
// designed as a node middleware

var querystring = require('querystring');
var https = require('https');

function getTranslatorKey(clientReq, clientRes, next) {
  // there are multiple res and req variables here as we both receive
  // a request and send one to Microsoft.  We then use MS's response in
  // our response.  We'll call the local ones clientReq/clientRes and the
  // cycle with MS is msReq/msRes
  //var url = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13";
  //var url1 = 'https://api.datamarket.azure.com/Bing/MicrosoftTranslator/v1/Translate';
  if (clientReq.url.match(/MSTranslatorKey/i) != null) {

    //break the url into components for http request :-/
    var options = {
      host: 'datamarket.accesscontrol.windows.net',
      path: '/v2/OAuth2-13/',
      method: 'POST'
    }

    // ms token request input params
    var requestContent = {
      grant_type: 'client_credentials',
      client_id: process.env.CLIENT_ID,
      client_secret: process.env.CLIENT_SECRET,
      scope: 'http://api.microsofttranslator.com'
    };
    if (!(requestContent.client_id && requestContent.client_secret)) {
      var errorMessage = '[WARNING] Required CLIENT_ID or CLIENT_SECRET environment keys not set; FAILING';
      console.log(errorMessage);
      clientRes.writeHead(503, errorMessage);
      clientRes.end();
      return;
    }

    var requiredData;
    // build the request object
    var msReq = https.request(options, function(msRes) {
      console.log('STATUS: ' + msRes.statusCode);
      console.log('HEADERS: ' + JSON.stringify(msRes.headers));
      msRes.setEncoding('utf8');
      msRes.on('data', function(chunk) {
        requiredData = parseTokenResponseData(chunk);

        // send the token back to the client
        clientRes.write(JSON.stringify(requiredData));  // hmm error handling?
        clientRes.end();
      });
    });
    msReq.on('error', function(e) {
      console.log('problem with request: ' + e.message);
    });

    // write the query input params into the request body
    msReq.write(querystring.stringify(requestContent));
    msReq.end(); //send to microsoft
  } else {
    next();
  }
};

function parseTokenResponseData(chunk) {
  var data = JSON.parse(chunk);
  console.log(data);
  return data;
}

function redirectToChat(clientReq, res, next) {
  console.log(clientReq.url);
  if (clientReq.url == '/') {
    res.writeHead(301, {Location: '/chat.html'});
    res.end();
  } else {
    next();
  };
}

//module.exports.getTranslatorKey = getTranslatorKey;
module.exports = getTranslatorKey;