smartmta/dist_ts/mail/delivery/smtpclient/utils/helpers.js

/**
 * SMTP Client Helper Functions
 * Protocol helper functions and utilities
 */
import { SMTP_CODES, REGEX_PATTERNS, LINE_ENDINGS } from '../constants.js';
/**
 * Parse SMTP server response
 */
export function parseSmtpResponse(data) {
    const lines = data.trim().split(/\r?\n/);
    const firstLine = lines[0];
    const match = firstLine.match(REGEX_PATTERNS.RESPONSE_CODE);
    if (!match) {
        return {
            code: 500,
            message: 'Invalid server response',
            raw: data
        };
    }
    const code = parseInt(match[1], 10);
    const separator = match[2];
    const message = lines.map(line => line.substring(4)).join(' ');
    // Check for enhanced status code
    const enhancedMatch = message.match(REGEX_PATTERNS.ENHANCED_STATUS);
    const enhancedCode = enhancedMatch ? enhancedMatch[1] : undefined;
    return {
        code,
        message: enhancedCode ? message.substring(enhancedCode.length + 1) : message,
        enhancedCode,
        raw: data
    };
}
/**
 * Parse EHLO response and extract capabilities
 */
export function parseEhloResponse(response) {
    const lines = response.trim().split(/\r?\n/);
    const capabilities = {
        extensions: new Set(),
        authMethods: new Set(),
        pipelining: false,
        starttls: false,
        eightBitMime: false
    };
    for (const line of lines.slice(1)) { // Skip first line (greeting)
        const extensionLine = line.substring(4); // Remove "250-" or "250 "
        const parts = extensionLine.split(/\s+/);
        const extension = parts[0].toUpperCase();
        capabilities.extensions.add(extension);
        switch (extension) {
            case 'PIPELINING':
                capabilities.pipelining = true;
                break;
            case 'STARTTLS':
                capabilities.starttls = true;
                break;
            case '8BITMIME':
                capabilities.eightBitMime = true;
                break;
            case 'SIZE':
                if (parts[1]) {
                    capabilities.maxSize = parseInt(parts[1], 10);
                }
                break;
            case 'AUTH':
                // Parse authentication methods
                for (let i = 1; i < parts.length; i++) {
                    capabilities.authMethods.add(parts[i].toUpperCase());
                }
                break;
        }
    }
    return capabilities;
}
/**
 * Format SMTP command with proper line ending
 */
export function formatCommand(command, ...args) {
    const fullCommand = args.length > 0 ? `${command} ${args.join(' ')}` : command;
    return fullCommand + LINE_ENDINGS.CRLF;
}
/**
 * Encode authentication string for AUTH PLAIN
 */
export function encodeAuthPlain(username, password) {
    const authString = `\0${username}\0${password}`;
    return Buffer.from(authString, 'utf8').toString('base64');
}
/**
 * Encode authentication string for AUTH LOGIN
 */
export function encodeAuthLogin(value) {
    return Buffer.from(value, 'utf8').toString('base64');
}
/**
 * Generate OAuth2 authentication string
 */
export function generateOAuth2String(username, accessToken) {
    const authString = `user=${username}\x01auth=Bearer ${accessToken}\x01\x01`;
    return Buffer.from(authString, 'utf8').toString('base64');
}
/**
 * Check if response code indicates success
 */
export function isSuccessCode(code) {
    return code >= 200 && code < 300;
}
/**
 * Check if response code indicates temporary failure
 */
export function isTemporaryFailure(code) {
    return code >= 400 && code < 500;
}
/**
 * Check if response code indicates permanent failure
 */
export function isPermanentFailure(code) {
    return code >= 500;
}
/**
 * Escape email address for SMTP commands
 */
export function escapeEmailAddress(email) {
    return `<${email.trim()}>`;
}
/**
 * Extract email address from angle brackets
 */
export function extractEmailAddress(email) {
    const match = email.match(/^<(.+)>$/);
    return match ? match[1] : email.trim();
}
/**
 * Generate unique connection ID
 */
export function generateConnectionId() {
    return `smtp-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
}
/**
 * Format timeout duration for human readability
 */
export function formatTimeout(milliseconds) {
    if (milliseconds < 1000) {
        return `${milliseconds}ms`;
    }
    else if (milliseconds < 60000) {
        return `${Math.round(milliseconds / 1000)}s`;
    }
    else {
        return `${Math.round(milliseconds / 60000)}m`;
    }
}
/**
 * Validate and normalize email data size
 */
export function validateEmailSize(emailData, maxSize) {
    const size = Buffer.byteLength(emailData, 'utf8');
    return !maxSize || size <= maxSize;
}
/**
 * Clean sensitive data from logs
 */
export function sanitizeForLogging(data) {
    if (typeof data !== 'object' || data === null) {
        return data;
    }
    const sanitized = { ...data };
    const sensitiveFields = ['password', 'pass', 'accessToken', 'refreshToken', 'clientSecret'];
    for (const field of sensitiveFields) {
        if (field in sanitized) {
            sanitized[field] = '[REDACTED]';
        }
    }
    return sanitized;
}
/**
 * Calculate exponential backoff delay
 */
export function calculateBackoffDelay(attempt, baseDelay = 1000) {
    return Math.min(baseDelay * Math.pow(2, attempt - 1), 30000); // Max 30 seconds
}
/**
 * Parse enhanced status code
 */
export function parseEnhancedStatusCode(code) {
    const match = code.match(/^(\d)\.(\d)\.(\d)$/);
    if (!match) {
        return null;
    }
    return {
        class: parseInt(match[1], 10),
        subject: parseInt(match[2], 10),
        detail: parseInt(match[3], 10)
    };
}
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