feat: kyc process

src/core/decorators/validations/index.ts

@@ -1,3 +1,4 @@
 // placeholder
 export * from './is-above-18';
 export * from './is-valid-phone-number';
+export * from './is-valid-saudi-id';

src/core/decorators/validations/is-valid-saudi-id.ts

@@ -0,0 +1,35 @@
+import { registerDecorator, ValidationArguments, ValidationOptions } from 'class-validator';
+
+export function isValidSaudiId(validationOptions?: ValidationOptions) {
+  return function (object: any, propertyName: string) {
+    registerDecorator({
+      name: 'isValidSaudiId',
+      target: object.constructor,
+      propertyName,
+      options: {
+        message: `${propertyName} must be a valid Saudi ID`,
+        ...validationOptions,
+      },
+      constraints: [],
+      validator: {
+        validate(value: any, args: ValidationArguments) {
+          if (typeof value !== 'string') return false;
+          if (!/^[12]\d{9}$/.test(value)) return false;
+
+          // Luhn algorithm
+          let sum = 0;
+          for (let i = 0; i < 10; i++) {
+            let digit = parseInt(value[i]);
+            if (i % 2 === 0) {
+              digit *= 2;
+              if (digit > 9) digit -= 9;
+            }
+            sum += digit;
+          }
+
+          return sum % 10 === 0;
+        },
+      },
+    });
+  };
+}