/**
 * SMTP Client Validation Utilities
 * Input validation functions for SMTP client operations
 */
import { REGEX_PATTERNS } from '../constants.js';
/**
 * Validate email address format
 * Supports RFC-compliant addresses including empty return paths for bounces
 */
export function validateEmailAddress(email) {
    if (typeof email !== 'string') {
        return false;
    }
    const trimmed = email.trim();
    // Handle empty return path for bounce messages (RFC 5321)
    if (trimmed === '' || trimmed === '<>') {
        return true;
    }
    // Handle display name formats
    const angleMatch = trimmed.match(/<([^>]+)>/);
    if (angleMatch) {
        return REGEX_PATTERNS.EMAIL_ADDRESS.test(angleMatch[1]);
    }
    // Regular email validation
    return REGEX_PATTERNS.EMAIL_ADDRESS.test(trimmed);
}
/**
 * Validate SMTP client options
 */
export function validateClientOptions(options) {
    const errors = [];
    // Required fields
    if (!options.host || typeof options.host !== 'string') {
        errors.push('Host is required and must be a string');
    }
    if (!options.port || typeof options.port !== 'number' || options.port < 1 || options.port > 65535) {
        errors.push('Port must be a number between 1 and 65535');
    }
    // Optional field validation
    if (options.connectionTimeout !== undefined) {
        if (typeof options.connectionTimeout !== 'number' || options.connectionTimeout < 1000) {
            errors.push('Connection timeout must be a number >= 1000ms');
        }
    }
    if (options.socketTimeout !== undefined) {
        if (typeof options.socketTimeout !== 'number' || options.socketTimeout < 1000) {
            errors.push('Socket timeout must be a number >= 1000ms');
        }
    }
    if (options.maxConnections !== undefined) {
        if (typeof options.maxConnections !== 'number' || options.maxConnections < 1) {
            errors.push('Max connections must be a positive number');
        }
    }
    if (options.maxMessages !== undefined) {
        if (typeof options.maxMessages !== 'number' || options.maxMessages < 1) {
            errors.push('Max messages must be a positive number');
        }
    }
    // Validate authentication options
    if (options.auth) {
        errors.push(...validateAuthOptions(options.auth));
    }
    return errors;
}
/**
 * Validate authentication options
 */
export function validateAuthOptions(auth) {
    const errors = [];
    if (auth.method && !['PLAIN', 'LOGIN', 'OAUTH2', 'AUTO'].includes(auth.method)) {
        errors.push('Invalid authentication method');
    }
    // For basic auth, require user and pass
    if ((auth.user || auth.pass) && (!auth.user || !auth.pass)) {
        errors.push('Both user and pass are required for basic authentication');
    }
    // For OAuth2, validate required fields
    if (auth.oauth2) {
        const oauth = auth.oauth2;
        if (!oauth.user || !oauth.clientId || !oauth.clientSecret || !oauth.refreshToken) {
            errors.push('OAuth2 requires user, clientId, clientSecret, and refreshToken');
        }
        if (oauth.user && !validateEmailAddress(oauth.user)) {
            errors.push('OAuth2 user must be a valid email address');
        }
    }
    return errors;
}
/**
 * Validate hostname format
 */
export function validateHostname(hostname) {
    if (!hostname || typeof hostname !== 'string') {
        return false;
    }
    // Basic hostname validation (allow IP addresses and domain names)
    const hostnameRegex = /^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)*[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$|^(?:\d{1,3}\.){3}\d{1,3}$|^\[(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\]$/;
    return hostnameRegex.test(hostname);
}
/**
 * Validate port number
 */
export function validatePort(port) {
    return typeof port === 'number' && port >= 1 && port <= 65535;
}
/**
 * Sanitize and validate domain name for EHLO
 */
export function validateAndSanitizeDomain(domain) {
    if (!domain || typeof domain !== 'string') {
        return 'localhost';
    }
    const sanitized = domain.trim().toLowerCase();
    if (validateHostname(sanitized)) {
        return sanitized;
    }
    return 'localhost';
}
/**
 * Validate recipient list
 */
export function validateRecipients(recipients) {
    const errors = [];
    const recipientList = Array.isArray(recipients) ? recipients : [recipients];
    for (const recipient of recipientList) {
        if (!validateEmailAddress(recipient)) {
            errors.push(`Invalid email address: ${recipient}`);
        }
    }
    return errors;
}
/**
 * Validate sender address
 */
export function validateSender(sender) {
    return validateEmailAddress(sender);
}
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FPLENBQUMsVUFBVSxDQUFDLENBQUMsQ0FBQyxDQUFDLFVBQVUsQ0FBQyxDQUFDLENBQUMsQ0FBQyxVQUFVLENBQUMsQ0FBQztJQUU1RSxLQUFLLE1BQU0sU0FBUyxJQUFJLGFBQWEsRUFBRSxDQUFDO1FBQ3RDLElBQUksQ0FBQyxvQkFBb0IsQ0FBQyxTQUFTLENBQUMsRUFBRSxDQUFDO1lBQ3JDLE1BQU0sQ0FBQyxJQUFJLENBQUMsMEJBQTBCLFNBQVMsRUFBRSxDQUFDLENBQUM7UUFDckQsQ0FBQztJQUNILENBQUM7SUFFRCxPQUFPLE1BQU0sQ0FBQztBQUNoQixDQUFDO0FBRUQ7O0dBRUc7QUFDSCxNQUFNLFVBQVUsY0FBYyxDQUFDLE1BQWM7SUFDM0MsT0FBTyxvQkFBb0IsQ0FBQyxNQUFNLENBQUMsQ0FBQztBQUN0QyxDQUFDIn0=