1 files changed, 33 insertions, 0 deletions
diff --git a/ui/lib/contract-namer.js b/ui/lib/contract-namer.js
new file mode 100644
index 000000000..f05e770cc
--- /dev/null
+++ b/ui/lib/contract-namer.js
@@ -0,0 +1,33 @@
+/* CONTRACT NAMER
+ *
+ * Takes an address,
+ * Returns a nicname if we have one stored,
+ * otherwise returns null.
+ */
+
+const contractMap = require('eth-contract-metadata')
+const ethUtil = require('ethereumjs-util')
+
+module.exports = function (addr, identities = {}) {
+  const checksummed = ethUtil.toChecksumAddress(addr)
+  if (contractMap[checksummed] && contractMap[checksummed].name) {
+    return contractMap[checksummed].name
+  }
+
+  const address = addr.toLowerCase()
+  const ids = hashFromIdentities(identities)
+  return addrFromHash(address, ids)
+}
+
+function hashFromIdentities (identities) {
+  const result = {}
+  for (const key in identities) {
+    result[key] = identities[key].name
+  }
+  return result
+}
+
+function addrFromHash (addr, hash) {
+  const address = addr.toLowerCase()
+  return hash[address] || null
+}