36 lines
1.3 KiB
JavaScript
36 lines
1.3 KiB
JavaScript
/**
|
|
* Normalizes and validates a phone number string based on specific rules.
|
|
*
|
|
* The normalization process is as follows:
|
|
* 1. All non-digit characters are stripped from the input string.
|
|
* 2. If the resulting number has a leading '1', it is removed.
|
|
*
|
|
* After normalization, the function validates that the resulting number
|
|
* is exactly 10 digits long.
|
|
*
|
|
* @param {string} rawPhoneNumber The raw phone number string provided by the user.
|
|
* @returns {string} The normalized, 10-digit phone number.
|
|
* @throws {Error} Throws an error if the phone number is invalid after normalization,
|
|
* allowing API endpoints to catch it and return a proper HTTP status.
|
|
*/
|
|
export function normalizeAndValidatePhoneNumber(rawPhoneNumber) {
|
|
if (!rawPhoneNumber || typeof rawPhoneNumber !== "string") {
|
|
throw new Error("Phone number is required.");
|
|
}
|
|
|
|
// 1. Strip all non-digit characters.
|
|
const digitsOnly = rawPhoneNumber.replace(/\D/g, "");
|
|
|
|
// 2. If the number starts with a '1', remove it.
|
|
let numberToValidate = digitsOnly;
|
|
if (numberToValidate.startsWith("1")) {
|
|
numberToValidate = numberToValidate.substring(1);
|
|
}
|
|
|
|
// 3. Check if the resulting number is exactly 10 digits long.
|
|
if (numberToValidate.length !== 10) {
|
|
throw new Error("Please provide a valid 10-digit phone number.");
|
|
}
|
|
|
|
return numberToValidate;
|
|
}
|