Merge pull request #1 from MetaMask/master

Merge from the source

1 files changed, 45 insertions, 0 deletions

diff --git a/ui/app/token-util.js b/ui/app/token-util.js
new file mode 100644
index 000000000..f84051ef5
--- /dev/null
+++ b/ui/app/token-util.js
@@ -0,0 +1,45 @@
+const abi = require('human-standard-token-abi')
+const Eth = require('ethjs-query')
+const EthContract = require('ethjs-contract')
+
+const tokenInfoGetter = function () {
+  if (typeof global.ethereumProvider === 'undefined') return
+
+  const eth = new Eth(global.ethereumProvider)
+  const contract = new EthContract(eth)
+  const TokenContract = contract(abi)
+
+  const tokens = {}
+
+  return async (address) => {
+    if (tokens[address]) {
+      return tokens[address]
+    }
+
+    const contract = TokenContract.at(address)
+
+    const result = await Promise.all([
+      contract.symbol(),
+      contract.decimals(),
+    ])
+
+    const [ symbol = [], decimals = [] ] = result
+
+    tokens[address] = { symbol: symbol[0], decimals: decimals[0] }
+
+    return tokens[address]
+  }
+}
+
+function calcTokenAmount (value, decimals) {
+  const multiplier = Math.pow(10, Number(decimals || 0))
+  const amount = Number(value / multiplier)
+
+  return amount
+}
+
+
+module.exports = {
+  tokenInfoGetter,
+  calcTokenAmount,
+}