QR Scanner for bitcoin URI

public/views/tab-scan.html

@@ -2,7 +2,7 @@
   <ion-nav-bar class="bar-stable">
     <ion-nav-title>Scan</ion-nav-title>
   </ion-nav-bar>
-  <ion-content ng-controller="tabScanController" ng-init="init()">
+  <ion-content class="padding" ng-controller="tabScanController" ng-init="init()">
 
     <canvas id="qr-canvas" width="200" height="150"></canvas>
     <video id="qrcode-scanner-video" width="300" height="225"></video>

src/js/controllers/tab-scan.js

@@ -1,11 +1,91 @@
 'use strict';
 
-angular.module('copayApp.controllers').controller('tabScanController', function($scope, $timeout, $ionicModal, gettextCatalog, platformInfo) {
+angular.module('copayApp.controllers').controller('tabScanController', function($scope, $timeout, $ionicModal, $log, $ionicPopup, configService, gettextCatalog, platformInfo, go, bitcore, lodash) {
 
   var isCordova = platformInfo.isCordova;
   var isWP = platformInfo.isWP;
   var isIOS = platformInfo.isIOS;
 
+  var config = configService.getSync();
+  var configWallet = config.wallet;
+  var walletSettings = configWallet.settings;
+
+  var unitToSatoshi = walletSettings.unitToSatoshi;
+  var unitDecimals = walletSettings.unitDecimals;
+  var satToUnit = 1 / unitToSatoshi;
+
+  var _showAlert = function(title, msg, cb) {
+    $log.warn(title +  ":"+ msg);
+    var alertPopup = $ionicPopup.alert({
+      title: title,
+      template: msg
+    });
+
+    if (!cb) cb = function(res) {};
+
+    alertPopup.then(cb);
+  };
+
+  var _dataScanned = function(data) {
+    var parsedData = _parseFromUri(data);
+
+    if (lodash.isEmpty(parsedData)) {
+      _showAlert('Bad bitcoin address', 'Could not recognize the bitcoin address', function(res) {
+        $scope.init();
+      });
+      return;
+    }
+
+    go.confirm(parsedData);
+  };
+
+  var _parseFromUri = function(uri) {
+
+    function sanitizeUri(uri) {
+      // Fixes when a region uses comma to separate decimals
+      var regex = /[\?\&]amount=(\d+([\,\.]\d+)?)/i;
+      var match = regex.exec(uri);
+      if (!match || match.length === 0) {
+        return uri;
+      }
+      var value = match[0].replace(',', '.');
+      var newUri = uri.replace(regex, value);
+      return newUri;
+    };
+
+    var satToUnit = 1 / unitToSatoshi;
+
+    // URI extensions for Payment Protocol with non-backwards-compatible request
+    if ((/^bitcoin:\?r=[\w+]/).exec(uri)) {
+      // TODO: PAYPRO
+    } else {
+      uri = sanitizeUri(uri);
+
+      if (!bitcore.URI.isValid(uri)) {
+        return uri;
+      }
+      var parsed = new bitcore.URI(uri);
+
+      var addr = parsed.address ? parsed.address.toString() : '';
+      var message = parsed.message;
+
+      var amount = parsed.amount ?
+        (parsed.amount.toFixed(0) * satToUnit).toFixed(unitDecimals) : 0;
+
+
+      if (parsed.r) {
+        // TODO: PAYPRO
+      } else {
+        // TODO: message
+        return {
+          toAddress: addr,
+          toAmount: amount
+        };
+      }
+    }
+
+  };
+
   var onSuccess = function(result) {
     $timeout(function() {
       window.plugins.spinnerDialog.hide();
@@ -14,6 +94,8 @@ angular.module('copayApp.controllers').controller('tabScanController', function(
 
     $timeout(function() {
       var data = isIOS ? result : result.text;
+      // Check if the current page is tabs.scan
+      if (go.is('tabs.scan')) _dataScanned(data);
       $scope.onScan({
         data: data
       });
@@ -103,7 +185,9 @@ angular.module('copayApp.controllers').controller('tabScanController', function(
       prevResult = data;
       return;
     }
+    // Check if the current page is tabs.scan
     _scanStop();
+    if (go.is('tabs.scan')) _dataScanned(data);
     $scope.cancel();
     $scope.onScan({
       data: data

src/js/services/go.js

@@ -39,6 +39,10 @@ angular.module('copayApp.services').factory('go', function($window, $ionicSideMe
     }
   };
 
+  root.confirm = function(params) {
+    $state.transitionTo('confirm', params)
+  };
+
   root.send = function() {
     root.path('tabs.send');
   };