Merge pull request #6283 from cmgustavo/bug/coinbase-02

Coinbase (purchase flow): adds bitcoin fee to create transaction

src/js/controllers/buyCoinbase.js

@@ -47,10 +47,20 @@ angular.module('copayApp.controllers').controller('buyCoinbaseController', funct
       data.stateParams.amount,
       data.stateParams.currency);
 
-    amount = parsedAmount.amount;
+    // Buy always in BTC
-    currency = parsedAmount.currency;
+    amount = (parsedAmount.amountSat / 100000000).toFixed(8);
+    currency = 'BTC';
+
     $scope.amountUnitStr = parsedAmount.amountUnitStr;
 
+    ongoingProcess.set('calculatingFee', true);
+    coinbaseService.checkEnoughFundsForFee(amount, function(err) {
+      ongoingProcess.set('calculatingFee', false);
+      if (err) {
+        showErrorAndBack(err);
+        return;
+      }
+
       $scope.network = coinbaseService.getNetwork();
       $scope.wallets = profileService.getWallets({
         onlyComplete: true,
@@ -107,6 +117,7 @@ angular.module('copayApp.controllers').controller('buyCoinbaseController', funct
         });
       });
     });
+  });
 
   $scope.buyRequest = function() {
     ongoingProcess.set('connectingCoinbase', true);
@@ -139,7 +150,7 @@ angular.module('copayApp.controllers').controller('buyCoinbaseController', funct
   };
 
   $scope.buyConfirm = function() {
-    var message = 'Buy bitcoin for ' + amount + ' ' + currency;
+    var message = 'Buy bitcoin for ' + $scope.amountUnitStr;
     var okText = 'Confirm';
     var cancelText = 'Cancel';
     popupService.showConfirm(null, message, okText, cancelText, function(ok) {

src/js/services/coinbaseService.js

@@ -1,6 +1,6 @@
 'use strict';
 
-angular.module('copayApp.services').factory('coinbaseService', function($http, $log, $window, $filter, platformInfo, lodash, storageService, configService, appConfigService, txFormatService, buyAndSellService, $rootScope) {
+angular.module('copayApp.services').factory('coinbaseService', function($http, $log, $window, $filter, platformInfo, lodash, storageService, configService, appConfigService, txFormatService, buyAndSellService, $rootScope, feeService) {
   var root = {};
   var credentials = {};
   var isCordova = platformInfo.isCordova;
@@ -107,6 +107,19 @@ angular.module('copayApp.services').factory('coinbaseService', function($http, $
     };
   };
 
+  root.checkEnoughFundsForFee = function(amount, cb) {
+    _getNetAmount(amount, function(err, reducedAmount) {
+      if (err) return cb(err);
+
+      // Check if transaction has enough funds to transfer bitcoin from Coinbase to Copay
+      if (reducedAmount < 0) {
+        return cb('Not enough funds for fee');
+      }
+
+      return cb();
+    });
+  };
+
   root.getSignupUrl = function() {
     return credentials.HOST + '/signup';
   }
@@ -153,6 +166,17 @@ angular.module('copayApp.services').factory('coinbaseService', function($http, $
     });
   };
 
+  var _getNetAmount = function(amount, cb) {
+    // Fee Normal for a single transaction (450 bytes)
+    var txNormalFeeKB = 450 / 1000;
+    feeService.getFeeRate(null, 'normal', function(err, feePerKB) {
+      if (err) return cb(err);
+      var feeBTC = (feePerKB * txNormalFeeKB / 100000000).toFixed(8);
+
+      return cb(null, amount - feeBTC, feeBTC);
+    });
+  };
+
   var _refreshToken = function(refreshToken, cb) {
     var req = {
       method: 'POST',
@@ -657,11 +681,24 @@ angular.module('copayApp.services').factory('coinbaseService', function($http, $
   var _sendToWallet = function(tx, accessToken, accountId, coinbasePendingTransactions) {
     if (!tx) return;
     var desc = appConfigService.nameCase + ' Wallet';
+    _getNetAmount(tx.amount.amount, function(err, amountBTC, feeBTC) {
+      if (err) {
+        _savePendingTransaction(tx, {
+          status: 'error',
+          error: err
+        }, function(err) {
+          if (err) $log.debug(err);
+          _updateTxs(coinbasePendingTransactions);
+        });
+        return;
+      }
+
       var data = {
         to: tx.toAddr,
-      amount: tx.amount.amount,
+        amount: amountBTC,
         currency: tx.amount.currency,
-      description: desc
+        description: desc,
+        fee: feeBTC
       };
       root.sendTo(accessToken, accountId, data, function(err, res) {
         if (err) {
@@ -695,6 +732,7 @@ angular.module('copayApp.services').factory('coinbaseService', function($http, $
           });
         }
       });
+    });
   };
 
   var _updateCoinbasePendingTransactions = function(obj /*, …*/ ) {