เช็คเลขบัตร ปชช.

src/interfaces/extension.ts

@@ -1,3 +1,5 @@
+import HttpStatus from "../interfaces/http-status";
+import HttpError from "../interfaces/http-error";
 class Extension {
   public static ToThaiMonth(value: number) {
     switch (value) {
@@ -119,6 +121,40 @@ class Extension {
     }
     return sum;
   }
+
+  public static CheckCitizen(value: string) {
+    let citizen = value
+    if (citizen.length !== 13) {
+      throw new HttpError(HttpStatus.NOT_FOUND, "กรุณากรอกข้อมูลรหัสบัตรประจำตัวประชาชนให้ครบ 13 หลัก",);
+    }
+    const citizenIdDigits = citizen.toString().split("").map(Number);
+    const cal =
+      citizenIdDigits[0] * 13 +
+      citizenIdDigits[1] * 12 +
+      citizenIdDigits[2] * 11 +
+      citizenIdDigits[3] * 10 +
+      citizenIdDigits[4] * 9 +
+      citizenIdDigits[5] * 8 +
+      citizenIdDigits[6] * 7 +
+      citizenIdDigits[7] * 6 +
+      citizenIdDigits[8] * 5 +
+      citizenIdDigits[9] * 4 +
+      citizenIdDigits[10] * 3 +
+      citizenIdDigits[11] * 2;
+    const calStp2 = cal % 11;
+    let chkDigit = 11 - calStp2;
+    if (chkDigit === 10) {
+      chkDigit = 1;
+    } 
+    else if (chkDigit === 11) {
+      chkDigit = chkDigit % 10;
+    }
+
+    if (citizenIdDigits[12] !== chkDigit) {
+      throw new HttpError(HttpStatus.NOT_FOUND, "ข้อมูลรหัสบัตรประจำตัวประชาชนไม่ถูกต้อง");
+    }
+    return citizen;
+  }
 }
 
 export default Extension;