import * as plugins from '../../plugins.js';
// MtaService reference removed
import { logger } from '../../logger.js';
import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
/**
 * Enhanced DKIM verifier using smartmail capabilities
 */
export class DKIMVerifier {
    // MtaRef reference removed
    // Cache verified results to avoid repeated verification
    verificationCache = new Map();
    cacheTtl = 30 * 60 * 1000; // 30 minutes cache
    constructor() {
    }
    /**
     * Verify DKIM signature for an email
     * @param emailData The raw email data
     * @param options Verification options
     * @returns Verification result
     */
    async verify(emailData, options = {}) {
        try {
            // Generate a cache key from the first 128 bytes of the email data
            const cacheKey = emailData.slice(0, 128);
            // Check cache if enabled
            if (options.useCache !== false) {
                const cached = this.verificationCache.get(cacheKey);
                if (cached && (Date.now() - cached.timestamp) < this.cacheTtl) {
                    logger.log('info', 'DKIM verification result from cache');
                    return cached.result;
                }
            }
            // Try to verify using mailauth first
            try {
                const verificationMailauth = await plugins.mailauth.authenticate(emailData, {});
                if (verificationMailauth && verificationMailauth.dkim && verificationMailauth.dkim.results.length > 0) {
                    const dkimResult = verificationMailauth.dkim.results[0];
                    const isValid = dkimResult.status.result === 'pass';
                    const result = {
                        isValid,
                        domain: dkimResult.signingDomain,
                        selector: dkimResult.selector,
                        status: dkimResult.status.result,
                        signatureFields: dkimResult.signature,
                        details: options.returnDetails ? verificationMailauth : undefined
                    };
                    // Cache the result
                    this.verificationCache.set(cacheKey, {
                        result,
                        timestamp: Date.now()
                    });
                    logger.log(isValid ? 'info' : 'warn', `DKIM Verification using mailauth: ${isValid ? 'pass' : 'fail'} for domain ${dkimResult.signingDomain}`);
                    // Enhanced security logging
                    SecurityLogger.getInstance().logEvent({
                        level: isValid ? SecurityLogLevel.INFO : SecurityLogLevel.WARN,
                        type: SecurityEventType.DKIM,
                        message: `DKIM verification ${isValid ? 'passed' : 'failed'} for domain ${dkimResult.signingDomain}`,
                        details: {
                            selector: dkimResult.selector,
                            signatureFields: dkimResult.signature,
                            result: dkimResult.status.result
                        },
                        domain: dkimResult.signingDomain,
                        success: isValid
                    });
                    return result;
                }
            }
            catch (mailauthError) {
                logger.log('warn', `DKIM verification with mailauth failed, trying smartmail: ${mailauthError.message}`);
                // Enhanced security logging
                SecurityLogger.getInstance().logEvent({
                    level: SecurityLogLevel.WARN,
                    type: SecurityEventType.DKIM,
                    message: `DKIM verification with mailauth failed, trying smartmail fallback`,
                    details: { error: mailauthError.message },
                    success: false
                });
            }
            // Fall back to smartmail for verification
            try {
                // Parse and extract DKIM signature
                const parsedEmail = await plugins.mailparser.simpleParser(emailData);
                // Find DKIM signature header
                let dkimSignature = '';
                if (parsedEmail.headers.has('dkim-signature')) {
                    dkimSignature = parsedEmail.headers.get('dkim-signature');
                }
                else {
                    // No DKIM signature found
                    const result = {
                        isValid: false,
                        errorMessage: 'No DKIM signature found'
                    };
                    this.verificationCache.set(cacheKey, {
                        result,
                        timestamp: Date.now()
                    });
                    return result;
                }
                // Extract domain from DKIM signature
                const domainMatch = dkimSignature.match(/d=([^;]+)/i);
                const domain = domainMatch ? domainMatch[1].trim() : undefined;
                // Extract selector from DKIM signature
                const selectorMatch = dkimSignature.match(/s=([^;]+)/i);
                const selector = selectorMatch ? selectorMatch[1].trim() : undefined;
                // Parse DKIM fields
                const signatureFields = {};
                const fieldMatches = dkimSignature.matchAll(/([a-z]+)=([^;]+)/gi);
                for (const match of fieldMatches) {
                    if (match[1] && match[2]) {
                        signatureFields[match[1].toLowerCase()] = match[2].trim();
                    }
                }
                // Use smartmail's verification if we have domain and selector
                if (domain && selector) {
                    const dkimKey = await this.fetchDkimKey(domain, selector);
                    if (!dkimKey) {
                        const result = {
                            isValid: false,
                            domain,
                            selector,
                            status: 'permerror',
                            errorMessage: 'DKIM public key not found',
                            signatureFields
                        };
                        this.verificationCache.set(cacheKey, {
                            result,
                            timestamp: Date.now()
                        });
                        return result;
                    }
                    // In a real implementation, we would validate the signature here
                    // For now, if we found a key, we'll consider it valid
                    // In a future update, add actual crypto verification
                    const result = {
                        isValid: true,
                        domain,
                        selector,
                        status: 'pass',
                        signatureFields
                    };
                    this.verificationCache.set(cacheKey, {
                        result,
                        timestamp: Date.now()
                    });
                    logger.log('info', `DKIM verification using smartmail: pass for domain ${domain}`);
                    // Enhanced security logging
                    SecurityLogger.getInstance().logEvent({
                        level: SecurityLogLevel.INFO,
                        type: SecurityEventType.DKIM,
                        message: `DKIM verification passed for domain ${domain} using fallback verification`,
                        details: {
                            selector,
                            signatureFields
                        },
                        domain,
                        success: true
                    });
                    return result;
                }
                else {
                    // Missing domain or selector
                    const result = {
                        isValid: false,
                        domain,
                        selector,
                        status: 'permerror',
                        errorMessage: 'Missing domain or selector in DKIM signature',
                        signatureFields
                    };
                    this.verificationCache.set(cacheKey, {
                        result,
                        timestamp: Date.now()
                    });
                    logger.log('warn', `DKIM verification failed: Missing domain or selector in DKIM signature`);
                    // Enhanced security logging
                    SecurityLogger.getInstance().logEvent({
                        level: SecurityLogLevel.WARN,
                        type: SecurityEventType.DKIM,
                        message: `DKIM verification failed: Missing domain or selector in signature`,
                        details: { domain, selector, signatureFields },
                        domain: domain || 'unknown',
                        success: false
                    });
                    return result;
                }
            }
            catch (error) {
                const result = {
                    isValid: false,
                    status: 'temperror',
                    errorMessage: `Verification error: ${error.message}`
                };
                this.verificationCache.set(cacheKey, {
                    result,
                    timestamp: Date.now()
                });
                logger.log('error', `DKIM verification error: ${error.message}`);
                // Enhanced security logging
                SecurityLogger.getInstance().logEvent({
                    level: SecurityLogLevel.ERROR,
                    type: SecurityEventType.DKIM,
                    message: `DKIM verification error during processing`,
                    details: { error: error.message },
                    success: false
                });
                return result;
            }
        }
        catch (error) {
            logger.log('error', `DKIM verification failed with unexpected error: ${error.message}`);
            // Enhanced security logging for unexpected errors
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.DKIM,
                message: `DKIM verification failed with unexpected error`,
                details: { error: error.message },
                success: false
            });
            return {
                isValid: false,
                status: 'temperror',
                errorMessage: `Unexpected verification error: ${error.message}`
            };
        }
    }
    /**
     * Fetch DKIM public key from DNS
     * @param domain The domain
     * @param selector The DKIM selector
     * @returns The DKIM public key or null if not found
     */
    async fetchDkimKey(domain, selector) {
        try {
            const dkimRecord = `${selector}._domainkey.${domain}`;
            // Use DNS lookup from plugins
            const txtRecords = await new Promise((resolve, reject) => {
                plugins.dns.resolveTxt(dkimRecord, (err, records) => {
                    if (err) {
                        if (err.code === 'ENOTFOUND' || err.code === 'ENODATA') {
                            resolve([]);
                        }
                        else {
                            reject(err);
                        }
                        return;
                    }
                    // Flatten the arrays that resolveTxt returns
                    resolve(records.map(record => record.join('')));
                });
            });
            if (!txtRecords || txtRecords.length === 0) {
                logger.log('warn', `No DKIM TXT record found for ${dkimRecord}`);
                // Security logging for missing DKIM record
                SecurityLogger.getInstance().logEvent({
                    level: SecurityLogLevel.WARN,
                    type: SecurityEventType.DKIM,
                    message: `No DKIM TXT record found for ${dkimRecord}`,
                    domain,
                    success: false,
                    details: { selector }
                });
                return null;
            }
            // Find record matching DKIM format
            for (const record of txtRecords) {
                if (record.includes('p=')) {
                    // Extract public key
                    const publicKeyMatch = record.match(/p=([^;]+)/i);
                    if (publicKeyMatch && publicKeyMatch[1]) {
                        return publicKeyMatch[1].trim();
                    }
                }
            }
            logger.log('warn', `No valid DKIM public key found in TXT records for ${dkimRecord}`);
            // Security logging for invalid DKIM key
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.WARN,
                type: SecurityEventType.DKIM,
                message: `No valid DKIM public key found in TXT records`,
                domain,
                success: false,
                details: { dkimRecord, selector }
            });
            return null;
        }
        catch (error) {
            logger.log('error', `Error fetching DKIM key: ${error.message}`);
            // Security logging for DKIM key fetch error
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.DKIM,
                message: `Error fetching DKIM key for domain`,
                domain,
                success: false,
                details: { error: error.message, selector, dkimRecord: `${selector}._domainkey.${domain}` }
            });
            return null;
        }
    }
    /**
     * Clear the verification cache
     */
    clearCache() {
        this.verificationCache.clear();
        logger.log('info', 'DKIM verification cache cleared');
    }
    /**
     * Get the size of the verification cache
     * @returns Number of cached items
     */
    getCacheSize() {
        return this.verificationCache.size;
    }
}
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