full

utils/iranIdentity.js

@@ -0,0 +1,45 @@
+function ibanMod97(iban) {
+  const rearranged = iban.slice(4) + iban.slice(0, 4)
+  const expanded = rearranged
+    .split('')
+    .map((char) => {
+      const code = char.charCodeAt(0)
+      if (code >= 65 && code <= 90) return String(code - 55)
+      return char
+    })
+    .join('')
+
+  let remainder = expanded
+  while (remainder.length > 2) {
+    const block = remainder.slice(0, 9)
+    remainder = String(parseInt(block, 10) % 97) + remainder.slice(block.length)
+  }
+  return parseInt(remainder, 10) % 97
+}
+
+/** digits24: the 24 digits after the "IR" prefix */
+function isValidIranSheba(digits24) {
+  if (!/^\d{24}$/.test(String(digits24 || ''))) return false
+  return ibanMod97(`IR${digits24}`) === 1
+}
+
+/** Standard Iranian national-code (کد ملی) checksum */
+function isValidIranNationalCode(code) {
+  const value = String(code || '')
+  if (!/^\d{10}$/.test(value)) return false
+  if (/^(\d)\1{9}$/.test(value)) return false
+
+  const digits = value.split('').map(Number)
+  const sum = digits
+    .slice(0, 9)
+    .reduce((acc, digit, index) => acc + digit * (10 - index), 0)
+  const remainder = sum % 11
+  const checkDigit = remainder < 2 ? remainder : 11 - remainder
+
+  return checkDigit === digits[9]
+}
+
+module.exports = {
+  isValidIranSheba,
+  isValidIranNationalCode,
+}