1 files changed, 43 insertions, 0 deletions
diff --git a/includes/external/addressbook/node_modules/validator/lib/isLuhnValid.js b/includes/external/addressbook/node_modules/validator/lib/isLuhnValid.js
new file mode 100644
index 0000000..27f6041
--- /dev/null
+++ b/includes/external/addressbook/node_modules/validator/lib/isLuhnValid.js
@@ -0,0 +1,43 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = isLuhnValid;
+
+var _assertString = _interopRequireDefault(require("./util/assertString"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function isLuhnValid(str) {
+  (0, _assertString.default)(str);
+  var sanitized = str.replace(/[- ]+/g, '');
+  var sum = 0;
+  var digit;
+  var tmpNum;
+  var shouldDouble;
+
+  for (var i = sanitized.length - 1; i >= 0; i--) {
+    digit = sanitized.substring(i, i + 1);
+    tmpNum = parseInt(digit, 10);
+
+    if (shouldDouble) {
+      tmpNum *= 2;
+
+      if (tmpNum >= 10) {
+        sum += tmpNum % 10 + 1;
+      } else {
+        sum += tmpNum;
+      }
+    } else {
+      sum += tmpNum;
+    }
+
+    shouldDouble = !shouldDouble;
+  }
+
+  return !!(sum % 10 === 0 ? sanitized : false);
+}
+
+module.exports = exports.default;
+module.exports.default = exports.default;
+\ No newline at end of file