1 files changed, 23 insertions, 0 deletions
diff --git a/ui/app/util.js b/ui/app/util.js
index ac3f42c6b..3f8b4dcc3 100644
--- a/ui/app/util.js
+++ b/ui/app/util.js
@@ -36,6 +36,8 @@ module.exports = {
   valueTable: valueTable,
   bnTable: bnTable,
   isHex: isHex,
+  exportAsFile: exportAsFile,
+  isInvalidChecksumAddress,
 }
 
 function valuesFor (obj) {
@@ -65,6 +67,12 @@ function isValidAddress (address) {
   return (isAllOneCase(prefixed) && ethUtil.isValidAddress(prefixed)) || ethUtil.isValidChecksumAddress(prefixed)
 }
 
+function isInvalidChecksumAddress (address) {
+  var prefixed = ethUtil.addHexPrefix(address)
+  if (address === '0x0000000000000000000000000000000000000000') return false
+  return !isAllOneCase(prefixed) && !ethUtil.isValidChecksumAddress(prefixed) && ethUtil.isValidAddress(prefixed)
+}
+
 function isAllOneCase (address) {
   if (!address) return true
   var lower = address.toLowerCase()
@@ -215,3 +223,18 @@ function readableDate (ms) {
 function isHex (str) {
   return Boolean(str.match(/^(0x)?[0-9a-fA-F]+$/))
 }
+
+function exportAsFile (filename, data) {
+  // source: https://stackoverflow.com/a/33542499 by Ludovic Feltz
+  const blob = new Blob([data], {type: 'text/csv'})
+  if (window.navigator.msSaveOrOpenBlob) {
+    window.navigator.msSaveBlob(blob, filename)
+  } else {
+    const elem = window.document.createElement('a')
+    elem.href = window.URL.createObjectURL(blob)
+    elem.download = filename
+    document.body.appendChild(elem)
+    elem.click()
+    document.body.removeChild(elem)
+  }
+}