add transfer tokens method to neon-js (#85)

merging into master right away, as opposed to dev first, as this is needed for next wallet release (i believe nothing else has changed on dev since it was last pushed to master?)

src/api/nep5.js

@@ -1,7 +1,10 @@
 import { ScriptBuilder } from '../sc'
-import { getScriptHashFromAddress } from '../wallet'
+import { getScriptHashFromAddress, Account } from '../wallet'
 import { Query, VMExtractor } from '../rpc'
 import { ab2str, hexstring2ab, reverseHex, fixed82num } from '../utils'
+import { getRPCEndpoint, getBalance } from './neonDB'
+import { Transaction } from '../transactions'
+import { ASSET_ID } from '../consts'
 
 /**
  * Queries for NEP5 Token information.
@@ -44,3 +47,49 @@ export const getTokenBalance = (net, scriptHash, address) => {
       return fixed82num(res.result.stack[0].value)
     })
 }
+
+/**
+ * Transfers NEP5 Tokens.
+ * @param {string} net
+ * @param {string} scriptHash
+ * @param {string} fromWif
+ * @param {string} toAddress
+ * @param {number} transferAmount
+ * @param {number} gasCost
+ * @param {function} signingFunction
+ * @return {Promise<Response>} RPC response
+ */
+export const doTransferToken = (net, scriptHash, fromWif, toAddress, transferAmount, gasCost = 0, signingFunction = null) => {
+  const account = new Account(fromWif)
+  const rpcEndpointPromise = getRPCEndpoint(net)
+  const balancePromise = getBalance(net, account.address)
+  let signedTx
+  let endpt
+  return Promise.all([rpcEndpointPromise, balancePromise])
+    .then((values) => {
+      endpt = values[0]
+      const balances = values[1]
+      const fromAddrScriptHash = reverseHex(getScriptHashFromAddress(account.address))
+      const intents = [
+        { assetId: ASSET_ID.GAS, value: 0.00000001, scriptHash: fromAddrScriptHash }
+      ]
+      const toAddrScriptHash = reverseHex(getScriptHashFromAddress(toAddress))
+      const invoke = { scriptHash, operation: 'transfer', args: [fromAddrScriptHash, toAddrScriptHash, transferAmount] }
+      const unsignedTx = Transaction.createInvocationTx(balances, intents, invoke, gasCost, { version: 1 })
+      if (signingFunction) {
+        return signingFunction(unsignedTx, account.publicKey)
+      } else {
+        return unsignedTx.sign(account.privateKey)
+      }
+    })
+    .then((signedResult) => {
+      signedTx = signedResult
+      return Query.sendRawTransaction(signedTx).execute(endpt)
+    })
+    .then((res) => {
+      if (res.result === true) {
+        res.txid = signedTx
+      }
+      return res
+    })
+}

tests/api/nep5.js

@@ -1,22 +1,26 @@
-import * as NEP5 from '../../src/api/nep5'
+import * as NEP5 from '../../src/api/nep5'
+import testKeys from '../testKeys.json'
 
 describe('NEP5', function () {
   this.timeout(10000)
+  const net = 'http://seed3.neo.org:20332'
+  const scriptHash = 'd7678dd97c000be3f33e9362e673101bac4ca654'
+
   it('get basic info', () => {
-    return NEP5.getTokenInfo('http://test1.cityofzion.io:8880', '5b7074e873973a6ed3708862f219a6fbf4d1c411')
+    return NEP5.getTokenInfo(net, scriptHash)
       .then(result => {
-        result.name.should.equal('Red Pulse Token 3.1.4')
-        result.symbol.should.equal('RPX')
+        result.name.should.equal('LOCALTOKEN')
+        result.symbol.should.equal('LWTF')
         result.decimals.should.equal(8)
-        result.totalSupply.should.be.above(1000)
+        result.totalSupply.should.equal(1969000)
       })
       .catch((e) => {
         console.log(e)
         throw e
       })
   })
   it('get balance', () => {
-    return NEP5.getTokenBalance('http://test1.cityofzion.io:8880', '5b7074e873973a6ed3708862f219a6fbf4d1c411', 'AVf4UGKevVrMR1j3UkPsuoYKSC4ocoAkKx')
+    return NEP5.getTokenBalance(net, scriptHash, testKeys.c.address)
       .then(result => {
         result.should.be.above(0)
       })
@@ -25,4 +29,18 @@ describe('NEP5', function () {
         throw e
       })
   })
+  it('transfers tokens', () => {
+    const testNet = 'TestNet'
+    const fromWif = 'L5FzBMGSG2d7HVJL5vWuXfxUKsrkX5irFhtw1L5zU4NAvNuXzd8a'
+    const transferAmount = 1
+    const gasCost = 0
+    return NEP5.doTransferToken(testNet, scriptHash, fromWif, testKeys.c.address, transferAmount, gasCost)
+      .then(({ result }) => {
+        result.should.equal(true)
+      })
+      .catch((e) => {
+        console.log(e)
+        throw e
+      })
+  })
 })