oidc-lib/src/wallet/pscan.js

A library for creating OIDC Service Providers

module.exports = {
   activate: activate,
   selectCamera: selectCamera,
   stop: stop
}

var cameraList = {};
var numCameras = 0;
var scanner;

function activate(){
  scanner = new Instascan.Scanner({ video: document.getElementById('preview'), mirror: false });
  scanner.addListener('scan', function (content, image) {
    // showResult(content);
    processScan(content);
    pk.util.log_debug(content);
  });

  Instascan.Camera.getCameras()
  .then(function (cameras) {
    numCameras = cameras.length;
    if (numCameras < 1){
      return;
    }

    var cameraId;
    var cameraName = window.localStorage.getItem("scanCam");
    
    for (var i=0; i<numCameras; i++){
      cameraList[cameras[i].id] = cameras[i];
      if (cameraName){
        if (cameras[i].name === cameraName){
          cameraId = cameras[i].id;
        }
      }
    }

    if (!cameraId){
      for (var i=0; i<numCameras; i++){
        var lc = cameras[i].name.toLowerCase();
        if (lc.includes('back') || lc.includes('rear')){
          cameraId = cameras[i].id;
          window.localStorage.setItem("scanCam", cameras[i].name);
          break;
        }
      }
    }

    if (!cameraId){
      cameraId = cameras[0].id;
    }

    paintCameras();

    if (!cameraId){
      cameraId = cameras[0].id;
      window.localStorage.setItem("scanCam", cameraId);
    }

    scanner.start(cameraList[cameraId]);

  },
  function(err){
    console.log("Activation error", err);
    pk.pmanager.managerNotification("You have blocked your wallet's access to your camera", 'alert-warning', true);
  });
}

function showResult(content){
  var resEl = document.getElementById("result");
  resEl.innerHTML += content + "<br/>";
}

function paintCameras(){
  if (numCameras > 1){
    var html = "";
    for (var id in cameraList){
      html += '<p class="dropdown-item" onclick="pk.pscan.selectCamera(\'' + id + '\');">' + cameraList[id].name + '</p>';
    }
    document.getElementById("cameraList").innerHTML = html;
    $('#selectCamera').attr("style", "display:block");
  }
}

function selectCamera(cameraId){
  scanner.stop();
  scanner.start(cameraList[cameraId]);
  window.localStorage.setItem("scanCam", cameraList[cameraId].name);
}

function stop(){
  if (scanner){
    scanner.stop();
  }
}

async function processScan(content){
  var potential_error = 'No response contacting service';
  try{
    var error_message = 'The bar code is not compatible with this wallet';
    var url = content;
    url = url.replace(/\\/g, '');
    pk.util.log_debug("URL:", url);
    var ourLocation = window.location.href; //.substring(0, window.location.href.lastIndexOf('/'));
    pk.util.log_debug("ourLocationRoot:", ourLocation);
    
    var urlComponents = url.split("?");
    var serviceUrl = urlComponents[0];
    pk.util.log_debug("serviceUrl:", serviceUrl);

    var credential_issuer;
    var paramsString;
    if (urlComponents.length > 1){
      paramsString = urlComponents[1];
      var paramComponents = paramsString.split("=");
      if (paramComponents.length > 1){
        if (paramComponents[0] == "req_cred"){
          credential_issuer = decodeURIComponent(paramComponents[1]);
        }
      }
    }

    scanner.stop();
    if (credential_issuer){
      await pk.pmanager.create_persona_with_credential(credential_issuer);
    }
    else{
      var location = serviceUrl + "?iss=" + ourLocation + (paramsString ? "&" + paramsString : "");
      window.location = location;      
    }    
  }
  catch (err){
      var cameraId = window.localStorage.getItem("scanCam");
      scanner.start(cameraList[cameraId]);

      alert(potential_error + ' ' + err);
  }
}