[PM-11350] Use shared expiration year normalization util function (#10735)

* use shared expiration year normalization util function

* use shared exp year normalization in web and desktop client

* handle cases where input has leading zeroes

* add utils tests

* handle cases where input is all zeroes

libs/common/src/vault/utils.ts

@@ -0,0 +1,42 @@
+type NonZeroIntegers = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
+type Year = `${NonZeroIntegers}${NonZeroIntegers}${0 | NonZeroIntegers}${0 | NonZeroIntegers}`;
+
+/**
+ * Takes a string or number value and returns a string value formatted as a valid 4-digit year
+ *
+ * @export
+ * @param {(string | number)} yearInput
+ * @return {*}  {(Year | null)}
+ */
+export function normalizeExpiryYearFormat(yearInput: string | number): Year | null {
+  // The input[type="number"] is returning a number, convert it to a string
+  // An empty field returns null, avoid casting `"null"` to a string
+  const yearInputIsEmpty = yearInput == null || yearInput === "";
+  let expirationYear = yearInputIsEmpty ? null : `${yearInput}`;
+
+  // Exit early if year is already formatted correctly or empty
+  if (yearInputIsEmpty || /^[1-9]{1}\d{3}$/.test(expirationYear)) {
+    return expirationYear as Year;
+  }
+
+  expirationYear = expirationYear
+    // For safety, because even input[type="number"] will allow decimals
+    .replace(/[^\d]/g, "")
+    // remove any leading zero padding (leave the last leading zero if it ends the string)
+    .replace(/^[0]+(?=.)/, "");
+
+  if (expirationYear === "") {
+    expirationYear = null;
+  }
+
+  // given the context of payment card expiry, a year character length of 3, or over 4
+  // is more likely to be a mistake than an intentional value for the far past or far future.
+  if (expirationYear && expirationYear.length !== 4) {
+    const paddedYear = ("00" + expirationYear).slice(-2);
+    const currentCentury = `${new Date().getFullYear()}`.slice(0, 2);
+
+    expirationYear = currentCentury + paddedYear;
+  }
+
+  return expirationYear as Year | null;
+}