Update CBS Mobile App codebase

src/utils/validation.ts

@@ -2,7 +2,33 @@ export const isValidPhone = (value: string) => /^[0-9]{10}$/.test(value.replace(
 
 export const isValidOtp = (value: string) => /^[0-9]{6}$/.test(value);
 
-export const isValidMpin = (value: string) => /^[0-9]{4}$/.test(value);
+/**
+ * Single source of truth for how many digits an MPIN has. The backend accepts
+ * 4 or 6; this app standardises on 4, so the keypad, the validators and the
+ * stored-profile handling all read from here rather than each hard-coding it.
+ */
+export const MPIN_LENGTH = 4;
+
+/**
+ * The backend refuses an all-same-digit MPIN. That rule is checked after
+ * decryption server-side, so it comes back as a `VALIDATION_ERROR` with a
+ * message rather than a field map — cheaper and clearer to catch it here
+ * before spending a round trip.
+ */
+export const isValidMpin = (value: string) =>
+  new RegExp(`^[0-9]{${MPIN_LENGTH}}$`).test(value) && !isRepeatedDigits(value);
+
+export const isRepeatedDigits = (value: string) =>
+  value.length > 0 && /^(\d)\1*$/.test(value);
+
+/** Constraints as the API documents them, not as any one bank formats them. */
+export const isValidAccountNumber = (value: string) => /^[0-9]{5,20}$/.test(value);
+
+export const isValidIfsc = (value: string) => /^[A-Za-z0-9]{6,15}$/.test(value);
+
+export const isValidMmid = (value: string) => /^[0-9]{7}$/.test(value);
+
+export const isValidNickname = (value: string) => value.length <= 60;
 
 export const isValidAmount = (value: string) => {
   const amount = Number(value);