91 lines
2.2 KiB
TypeScript
91 lines
2.2 KiB
TypeScript
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const DISPOSABLE_EMAIL_DOMAINS = [
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'tempmail.com',
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'throwawaymail.com',
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'tempmail100.com'
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];
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export type EmailValidationError =
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| 'invalid_email_format'
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| 'email_part_too_long'
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| 'disposable_email_not_allowed'
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| 'invalid_characters';
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const EMAIL_REGEX = /^(?=[a-zA-Z0-9@._%+-]{6,254}$)[a-zA-Z0-9._%+-]{1,64}@(?:[a-zA-Z0-9-]{1,63}\.){1,8}[a-zA-Z]{2,63}$/;
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export function validateEmail(email: string): {
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isValid: boolean;
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error?: string;
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} {
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// validate email format
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if (!EMAIL_REGEX.test(email)) {
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return {
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isValid: false,
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error: 'invalid_email_format'
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};
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}
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// check domain length
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const [localPart, domain] = email.split('@');
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if (domain.length > 255 || localPart.length > 64) {
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return {
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isValid: false,
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error: 'email_part_too_long'
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};
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}
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// check if it's a disposable email
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if (DISPOSABLE_EMAIL_DOMAINS.includes(domain.toLowerCase())) {
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return {
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isValid: false,
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error: 'disposable_email_not_allowed'
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};
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}
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// check for special characters
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if (/[<>()[\]\\.,;:\s@"]+/.test(localPart)) {
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return {
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isValid: false,
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error: 'invalid_characters'
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};
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}
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return { isValid: true };
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}
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// email validation (including alias detection)
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export function normalizeEmail(email: string): string {
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if (!email) return '';
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// convert to lowercase
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let normalizedEmail = email.toLowerCase();
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// separate email local part and domain part
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const [localPart, domain] = normalizedEmail.split('@');
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// handle different email service provider alias rules
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switch (domain) {
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case 'gmail.com':
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// remove dot and + suffix
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const gmailBase = localPart
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.replace(/\./g, '')
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.split('+')[0];
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return `${gmailBase}@${domain}`;
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case 'outlook.com':
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case 'hotmail.com':
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case 'live.com':
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// remove + suffix
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const microsoftBase = localPart.split('+')[0];
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return `${microsoftBase}@${domain}`;
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case 'yahoo.com':
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// remove - suffix
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const yahooBase = localPart.split('-')[0];
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return `${yahooBase}@${domain}`;
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default:
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// for other emails, only remove + suffix
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const baseLocalPart = localPart.split('+')[0];
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return `${baseLocalPart}@${domain}`;
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}
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}
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