gochat/frontend/app/javascript/shared/helpers/Validators.js

/**
 * Checks if a string is a valid E.164 phone number format.
 * @param {string} value - The phone number to validate.
 * @returns {boolean} True if the number is in E.164 format, false otherwise.
 */
export const isPhoneE164 = value => !!value.match(/^\+[1-9]\d{1,14}$/);

/**
 * Validates a phone number after removing the dial code.
 * @param {string} value - The full phone number including dial code.
 * @param {string} dialCode - The dial code to remove before validation.
 * @returns {boolean} True if the number (without dial code) is valid, false otherwise.
 */
export const isPhoneNumberValid = (value, dialCode) => {
  const number = value.replace(dialCode, '');
  return !!number.match(/^[0-9]{1,14}$/);
};

/**
 * Checks if a string is either a valid E.164 phone number or empty.
 * @param {string} value - The phone number to validate.
 * @returns {boolean} True if the number is in E.164 format or empty, false otherwise.
 */
export const isPhoneE164OrEmpty = value => isPhoneE164(value) || value === '';

/**
 * Validates a phone number with dial code, requiring at least 5 digits.
 * @param {string} value - The full phone number including dial code.
 * @returns {boolean} True if the number is valid, false otherwise.
 */
export const isPhoneNumberValidWithDialCode = value => {
  const number = value.replace(/^\+/, ''); // Remove the '+' sign
  return !!number.match(/^[1-9]\d{4,}$/); // Validate the phone number with minimum 5 digits
};

/**
 * Checks if a string starts with a plus sign.
 * @param {string} value - The string to check.
 * @returns {boolean} True if the string starts with '+', false otherwise.
 */
export const startsWithPlus = value => value.startsWith('+');

/**
 * Checks if a string is a valid URL (starts with 'http') or is empty.
 * @param {string} [value=''] - The string to check.
 * @returns {boolean} True if the string is a valid URL or empty, false otherwise.
 */
export const shouldBeUrl = (value = '') =>
  value ? value.startsWith('http') : true;

/**
 * Validates a password for complexity requirements.
 * @param {string} value - The password to validate.
 * @returns {boolean} True if the password meets all requirements, false otherwise.
 */
export const isValidPassword = value => {
  const containsUppercase = /[A-Z]/.test(value);
  const containsLowercase = /[a-z]/.test(value);
  const containsNumber = /[0-9]/.test(value);
  const containsSpecialCharacter = /[!@#$%^&*()_+\-=[\]{}|'"/\\.,`<>:;?~]/.test(
    value
  );
  return (
    containsUppercase &&
    containsLowercase &&
    containsNumber &&
    containsSpecialCharacter
  );
};

/**
 * Checks if a string consists only of digits.
 * @param {string} value - The string to check.
 * @returns {boolean} True if the string contains only digits, false otherwise.
 */
export const isNumber = value => /^\d+$/.test(value);

/**
 * Validates a domain name.
 * @param {string} value - The domain name to validate.
 * @returns {boolean} True if the domain is valid or empty, false otherwise.
 */
export const isDomain = value => {
  if (value !== '') {
    const domainRegex = /^([\p{L}0-9]+(-[\p{L}0-9]+)*\.)+[a-z]{2,}$/gmu;
    return domainRegex.test(value);
  }
  return true;
};

/**
 * Creates a RegExp object from a string representation of a regular expression.
 * @param {string} regexPatternValue - The string representation of the regex (e.g., '/pattern/flags').
 * @returns {RegExp} A RegExp object created from the input string.
 */
export const getRegexp = regexPatternValue => {
  let lastSlash = regexPatternValue.lastIndexOf('/');
  return new RegExp(
    regexPatternValue.slice(1, lastSlash),
    regexPatternValue.slice(lastSlash + 1)
  );
};

/**
 * Normalises a user-entered regex pattern into canonical `/source/flags` form.
 * Strips `/.../flags` wrapping if the user included it, so `new RegExp` does
 * not double-escape the slashes on save.
 *
 * @param {string} pattern - Raw pattern string from the form.
 * @returns {?string} Canonical `/source/flags` string, or null when empty.
 */
export const normalizeRegexPattern = pattern => {
  if (!pattern) return null;
  const match = pattern.match(/^\/(.+)\/([gimsuy]*)$/);
  const source = match ? match[1] : pattern;
  const flags = match ? match[2] : '';
  return new RegExp(source, flags).toString();
};

/**
 * Checks if a string is a valid slug (letters, numbers, hyphens only, no spaces or other symbols).
 * @param {string} value - The slug to validate.
 * @returns {boolean} True if the slug is valid, false otherwise.
 */
export const isValidSlug = value => /^[a-zA-Z0-9-]+$/.test(value);