pullum-cavea/nfc_interface.js at master · Sensorica/pullum-cavea · GitHub

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var nfc  = require('./node_modules/nfc/index').nfc
  , util = require('util')
  , version = nfc.version()
  , devices = nfc.scan()
  , fs = require('fs')
  , http = require('http')
  ;

var http_options = { //put it in command line argsv
    host: "10.0.20.99", // simulates blockchain rpc service IP
    port: 8337 // simulates blockchain rpc service port
};

if (process.argv.length == 3) http_options['host'] = process.argv[2];

var deviceID
  , auth_path = './auth_card/'
  , master_path = './master_card/'
  , program_mode=false
  , go_fwd = true
  , oldTime = Date.now()
  , master_uid = ''
  , permissions = 0;
  ;

function send_http_req(action, orig_uid, perms, cb) {
  var received="";
  var uid=orig_uid.replace(/:/g, "");
  var m_uid=master_uid.replace(/:/g, "");
  http_options['path'] = '/'+action+'?uid='+uid+'&m_uid='+m_uid+'&perms='+perms;
  console.log(http_options);
  var req = http.get(http_options, function(res) {
    res.setEncoding("utf8");  //to emit events as strings
    res.on("data", function(data) {
        received=data;
        cb(null, received);
    });
  });
  req.on("error", function(err, msg) {
    cb(err, msg);
  });
  req.end();
}

function read(deviceID) {

  var nfcdev = new nfc.NFC();
  nfcdev.on('read', function(tag) {

  var nowTime = Date.now()
  , permissions =0;

  uid=tag.uid;
  //console.log("\n============CARD UID:", uid);

  if (nowTime > oldTime + 1000) { //wait 1 second to avoid double tap
    oldTime=nowTime;
    send_http_req("getperms", uid, 0, function (err, result) {
        permissions = result;
        //console.log("perms:", permissions);
        if (permissions == 127) {
	        master_uid=uid;
	        program_mode=!program_mode;
            if (program_mode) {
                m_uid = uid;
	   	    //Set led to yellow
    	        console.log("Program mode enabled, Master:", uid);
	        }
            else {
                m_uid = '';
	   	    //Set led to blinking (normal mode)
    	        console.log("Program mode disabled, Master:", uid);
            }
	    }

        if (program_mode && (uid != master_uid)){
            exists = (permissions == 1);
            if (exists)
                send_http_req("deluser", uid, 0, function (err, result) {
    	            console.log("UID deleted:", result);
                });
	        else send_http_req("adduser", uid, 1, function (err, result) {
    	            console.log("UID added:", result);
                });//1= basic access permissions

        }

        if (!program_mode) {
            if (permissions == 1) {
	        //Set led to green and unlock
	            console.log("Access granted to UID:", uid);
	        }
            else {
	            console.log("Not valid for access UID:", uid);
	            //Set led to red
	        }
        }
    });
  }//only do all of the above if there is no double tap
  else {
    //console.log("Ignoring consecutive tap for UID:", uid);
  }

  }); //end of read event

  nfcdev.on('error', function(err) {
    console.log(util.inspect(err, { depth: null }));
  });

  nfcdev.on('stopped', function() {
    console.log('***** Stopped');
  });

  console.log(nfcdev.start(deviceID));
} //end of read(device)

deviceID=Object.keys(devices)[0];
read(deviceID);