1 files changed, 105 insertions, 0 deletions
diff --git a/ui/app/helpers/transactions.util.js b/ui/app/helpers/transactions.util.js
new file mode 100644
index 000000000..54df54aa8
--- /dev/null
+++ b/ui/app/helpers/transactions.util.js
@@ -0,0 +1,105 @@
+import ethUtil from 'ethereumjs-util'
+import MethodRegistry from 'eth-method-registry'
+import abi from 'human-standard-token-abi'
+import abiDecoder from 'abi-decoder'
+
+import {
+  TOKEN_METHOD_TRANSFER,
+  TOKEN_METHOD_APPROVE,
+  TOKEN_METHOD_TRANSFER_FROM,
+  SEND_ETHER_ACTION_KEY,
+  DEPLOY_CONTRACT_ACTION_KEY,
+  APPROVE_ACTION_KEY,
+  SEND_TOKEN_ACTION_KEY,
+  TRANSFER_FROM_ACTION_KEY,
+  SIGNATURE_REQUEST_KEY,
+  UNKNOWN_FUNCTION_KEY,
+} from '../constants/transactions'
+
+abiDecoder.addABI(abi)
+
+export function getTokenData (data = {}) {
+  return abiDecoder.decodeMethod(data)
+}
+
+const registry = new MethodRegistry({ provider: global.ethereumProvider })
+
+export async function getMethodData (data = {}) {
+  const prefixedData = ethUtil.addHexPrefix(data)
+  const fourBytePrefix = prefixedData.slice(0, 10)
+  const sig = await registry.lookup(fourBytePrefix)
+  const parsedResult = registry.parse(sig)
+
+  return {
+    name: parsedResult.name,
+    params: parsedResult.args,
+  }
+}
+
+export function isConfirmDeployContract (txData = {}) {
+  const { txParams = {} } = txData
+  return !txParams.to
+}
+
+export async function getTransactionActionKey (transaction, methodData) {
+  const { txParams: { data, to } = {}, msgParams } = transaction
+
+  if (msgParams) {
+    return SIGNATURE_REQUEST_KEY
+  }
+
+  if (isConfirmDeployContract(transaction)) {
+    return DEPLOY_CONTRACT_ACTION_KEY
+  }
+
+  if (data) {
+    const toSmartContract = await isSmartContractAddress(to)
+
+    if (!toSmartContract) {
+      return SEND_ETHER_ACTION_KEY
+    }
+
+    const { name } = methodData
+    const methodName = name && name.toLowerCase()
+
+    if (!methodName) {
+      return UNKNOWN_FUNCTION_KEY
+    }
+
+    switch (methodName) {
+      case TOKEN_METHOD_TRANSFER:
+        return SEND_TOKEN_ACTION_KEY
+      case TOKEN_METHOD_APPROVE:
+        return APPROVE_ACTION_KEY
+      case TOKEN_METHOD_TRANSFER_FROM:
+        return TRANSFER_FROM_ACTION_KEY
+      default:
+        return name
+    }
+  } else {
+    return SEND_ETHER_ACTION_KEY
+  }
+}
+
+export function getLatestSubmittedTxWithNonce (transactions = [], nonce = '0x0') {
+  if (!transactions.length) {
+    return {}
+  }
+
+  return transactions.reduce((acc, current) => {
+    const { submittedTime, txParams: { nonce: currentNonce } = {} } = current
+
+    if (currentNonce === nonce) {
+      return acc.submittedTime
+        ? submittedTime > acc.submittedTime ? current : acc
+        : current
+    } else {
+      return acc
+    }
+  }, {})
+}
+
+export async function isSmartContractAddress (address) {
+  const code = await global.eth.getCode(address)
+  return code && code !== '0x'
+}