ADD: send MAX (for BIP84 & BIP49)

BlueComponents.js

@@ -1923,6 +1923,7 @@ export class BlueBitcoinAmount extends Component {
     } else {
       localCurrency = loc.formatBalanceWithoutSuffix(amount.toString(), BitcoinUnit.LOCAL_CURRENCY, false);
     }
+    if (amount === BitcoinUnit.MAX) localCurrency = ''; // we dont want to display NaN
     return (
       <TouchableWithoutFeedback disabled={this.props.pointerEvents === 'none'} onPress={() => this.textInput.focus()}>
         <View>
@@ -1939,6 +1940,12 @@ export class BlueBitcoinAmount extends Component {
                 }
                 this.props.onChangeText(text);
               }}
+              onBlur={() => {
+                if (this.props.onBlur) this.props.onBlur();
+              }}
+              onFocus={() => {
+                if (this.props.onFocus) this.props.onFocus();
+              }}
               placeholder="0"
               maxLength={10}
               ref={textInput => (this.textInput = textInput)}

class/abstract-wallet.js

@@ -68,6 +68,10 @@ export class AbstractWallet {
     return true;
   }
 
+  allowSendMax(): boolean {
+    return false;
+  }
+
   allowRBF() {
     return false;
   }

class/hd-segwit-bech32-wallet.js

@@ -36,6 +36,10 @@ export class HDSegwitBech32Wallet extends AbstractHDWallet {
     return true;
   }
 
+  allowSendMax(): boolean {
+    return true;
+  }
+
   /**
    * @inheritDoc
    */

class/hd-segwit-p2sh-wallet.js

@@ -5,6 +5,7 @@ import bip39 from 'bip39';
 import BigNumber from 'bignumber.js';
 import b58 from 'bs58check';
 import signer from '../models/signer';
+import { BitcoinUnit } from '../models/bitcoinUnits';
 const bitcoin = require('bitcoinjs-lib');
 const bitcoin5 = require('bitcoinjs5');
 const HDNode = require('bip32');
@@ -49,6 +50,10 @@ export class HDSegwitP2SHWallet extends AbstractHDWallet {
     return true;
   }
 
+  allowSendMax(): boolean {
+    return true;
+  }
+
   async generate() {
     let that = this;
     return new Promise(function(resolve) {
@@ -255,12 +260,29 @@ export class HDSegwitP2SHWallet extends AbstractHDWallet {
     }
   }
 
+  /**
+   *
+   * @param utxos
+   * @param amount Either float (BTC) or string 'MAX' (BitcoinUnit.MAX) to send all
+   * @param fee
+   * @param address
+   * @returns {string}
+   */
   createTx(utxos, amount, fee, address) {
     for (let utxo of utxos) {
       utxo.wif = this._getWifForAddress(utxo.address);
     }
 
     let amountPlusFee = parseFloat(new BigNumber(amount).plus(fee).toString(10));
+
+    if (amount === BitcoinUnit.MAX) {
+      amountPlusFee = new BigNumber(0);
+      for (let utxo of utxos) {
+        amountPlusFee = amountPlusFee.plus(utxo.amount);
+      }
+      amountPlusFee = amountPlusFee.dividedBy(100000000).toString(10);
+    }
+
     return signer.createHDSegwitTransaction(
       utxos,
       address,

models/bitcoinUnits.js

@@ -2,6 +2,7 @@ export const BitcoinUnit = Object.freeze({
   BTC: 'BTC',
   SATS: 'sats',
   LOCAL_CURRENCY: 'local_currency',
+  MAX: 'MAX',
 });
 
 export const Chain = Object.freeze({

screen/send/details.js

@@ -22,6 +22,7 @@ import {
   BlueAddressInput,
   BlueDismissKeyboardInputAccessory,
   BlueLoading,
+  BlueButtonLink,
 } from '../../BlueComponents';
 import Slider from '@react-native-community/slider';
 import PropTypes from 'prop-types';
@@ -72,6 +73,7 @@ export default class SendDetails extends Component {
       }
       this.state = {
         isLoading: true,
+        showSendMax: false,
         isFeeSelectionModalVisible: false,
         fromAddress,
         fromWallet,
@@ -466,6 +468,9 @@ export default class SendDetails extends Component {
 
     let targets = [];
     targets.push({ address: this.state.address, value: satoshis });
+    if (this.state.amount === BitcoinUnit.MAX) {
+      targets = [{ address: this.state.address }];
+    }
 
     let { tx, fee } = wallet.createTransaction(wallet.getUtxo(), targets, requestedSatPerByte, changeAddress);
 
@@ -629,8 +634,25 @@ export default class SendDetails extends Component {
                 isLoading={this.state.isLoading}
                 amount={this.state.amount.toString()}
                 onChangeText={text => this.setState({ amount: text })}
+                onBlur={() => {
+                  this.setState({ showSendMax: false });
+                }}
+                onFocus={() => {
+                  this.setState({ showSendMax: true });
+                }}
                 inputAccessoryViewID={BlueDismissKeyboardInputAccessory.InputAccessoryViewID}
               />
+              {this.state.showSendMax && this.state.fromWallet.allowSendMax() && (
+                <View>
+                  <BlueButtonLink
+                    title={'send MAX'}
+                    onPress={() => {
+                      console.log('state was set');
+                      this.setState({ amount: 'MAX' });
+                    }}
+                  />
+                </View>
+              )}
               <BlueAddressInput
                 onChangeText={text => {
                   if (!this.processBIP70Invoice(text)) {

tests/integration/HDWallet.test.js

@@ -1,5 +1,6 @@
 /* global it, jasmine, afterAll, beforeAll */
 import { SegwitP2SHWallet, SegwitBech32Wallet, HDSegwitP2SHWallet, HDLegacyBreadwalletWallet, HDLegacyP2PKHWallet } from '../../class';
+import {BitcoinUnit} from "../../models/bitcoinUnits";
 global.crypto = require('crypto'); // shall be used by tests under nodejs CLI, but not in RN environment
 let assert = require('assert');
 let bitcoin = require('bitcoinjs-lib');
@@ -177,6 +178,35 @@ it('HD (BIP49) can create TX', async () => {
   chunksIn = bitcoin.script.decompile(tx.outs[0].script);
   toAddress = bitcoin.address.fromOutputScript(chunksIn);
   assert.strictEqual('3GcKN7q7gZuZ8eHygAhHrvPa5zZbG5Q1rK', toAddress);
+
+  // testing sendMAX
+  hd.utxo = [
+    {
+      txid: 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+      vout: 0,
+      amount: 26000,
+      address: '3GgPyzKfWXiaXMbJ9LeEVGetvEXdrX9Ecj',
+      wif: 'L3fg5Jb6tJDVMvoG2boP4u3CxjX1Er3e7Z4zDALQdGgVLLE8zVUr',
+    },
+    {
+      txid: 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+      vout: 0,
+      amount: 26000,
+      address: '3GgPyzKfWXiaXMbJ9LeEVGetvEXdrX9Ecj',
+      wif: 'L3fg5Jb6tJDVMvoG2boP4u3CxjX1Er3e7Z4zDALQdGgVLLE8zVUr',
+    },
+    {
+      txid: 'cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc',
+      vout: 0,
+      amount: 26000,
+      address: '3GgPyzKfWXiaXMbJ9LeEVGetvEXdrX9Ecj',
+      wif: 'L3fg5Jb6tJDVMvoG2boP4u3CxjX1Er3e7Z4zDALQdGgVLLE8zVUr',
+    },
+  ];
+  txhex = hd.createTx(hd.utxo, BitcoinUnit.MAX, 0.00003, '3GcKN7q7gZuZ8eHygAhHrvPa5zZbG5Q1rK');
+  tx = bitcoin.Transaction.fromHex(txhex);
+  assert.strictEqual(tx.outs.length, 1);
+  assert.strictEqual(tx.outs[0].value, 75000);
 });
 
 it('Segwit HD (BIP49) can fetch UTXO', async function() {