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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | /** * WhatsAppQRHandler * Manages QR code generation and emission with tenant isolation * * @module services/whatsapp/WhatsAppQRHandler */ const qrcode = require('qrcode'); const { logger } = require('../../config/logger'); class WhatsAppQRHandler { constructor(io, options = {}) { this.io = io; this.tenantQRCodes = new Map(); // Store QR codes per tenant this.tenantCounters = new Map(); // Store generation counters per tenant this.tenantTimeouts = new Map(); // Store timeouts per tenant this.maxQrGenerations = options.maxQrGenerations || 10; this.qrTimeoutDuration = options.qrTimeoutDuration || 180000; // 3 minutes } /** * Generate QR code for tenant * @param {number} tenantId - Tenant ID * @param {string} qrString - QR string from Baileys * @returns {Promise<string|null>} Base64 QR code or null */ async generateQR(tenantId, qrString) { try { const currentCount = this.tenantCounters.get(tenantId) || 0; const newCount = currentCount + 1; this.tenantCounters.set(tenantId, newCount); logger.info('⚡ Generating QR code for tenant', { tenantId, attempt: newCount, maxAttempts: this.maxQrGenerations }); if (newCount > this.maxQrGenerations) { logger.error('Maximum QR generations reached for tenant', { tenantId }); this.emitQRStatus(tenantId, 'max_attempts_reached'); return null; } const qrStart = Date.now(); // Generate base64 QR code with optimized settings const qr = await qrcode.toDataURL(qrString, { errorCorrectionLevel: 'M', // Medium error correction (faster than H) type: 'image/png', quality: 0.92, margin: 1, width: 300 // Fixed width for faster generation }); const qrTime = Date.now() - qrStart; this.tenantQRCodes.set(tenantId, qr); // Emit QR code directly (like 2.0 version) this.io.emit('qr-code', qr); logger.info(`✅ QR code generated and emitted in ${qrTime}ms`, { tenantId, qrLength: qr.length, attempt: newCount }); // Set timeout for QR expiration this.setQRTimeout(tenantId); return qr; } catch (error) { logger.error('Error generating QR code for tenant', { tenantId, error: error.message }); this.emitQRStatus(tenantId, 'generation_error'); return null; } } /** * Set timeout for QR code expiration * @param {number} tenantId - Tenant ID */ setQRTimeout(tenantId) { // Clear existing timeout const existingTimeout = this.tenantTimeouts.get(tenantId); if (existingTimeout) { clearTimeout(existingTimeout); } // Set new timeout const timeout = setTimeout(() => { logger.warn('QR code expired for tenant', { tenantId }); this.emitQRStatus(tenantId, 'expired'); this.tenantQRCodes.delete(tenantId); }, this.qrTimeoutDuration); this.tenantTimeouts.set(tenantId, timeout); } /** * Clear QR code for tenant * @param {number} tenantId - Tenant ID */ clearQR(tenantId) { this.tenantQRCodes.delete(tenantId); this.tenantCounters.delete(tenantId); const timeout = this.tenantTimeouts.get(tenantId); if (timeout) { clearTimeout(timeout); this.tenantTimeouts.delete(tenantId); } // Emit null to clear QR code (like 2.0 version) this.io.emit('qr-code', null); logger.info('QR code cleared for tenant', { tenantId }); } /** * Emit QR status event to tenant * @param {number} tenantId - Tenant ID * @param {string} status - Status message */ emitQRStatus(tenantId, status) { const attempts = this.tenantCounters.get(tenantId) || 0; this.io.emit('qr-status', { status, tenantId, attempts, maxAttempts: this.maxQrGenerations }); } /** * Get current QR code for tenant * @param {number} tenantId - Tenant ID * @returns {string|null} QR code or null */ getCurrentQR(tenantId) { return this.tenantQRCodes.get(tenantId) || null; } /** * Reset QR generation counter for tenant * @param {number} tenantId - Tenant ID */ resetCounter(tenantId) { this.tenantCounters.set(tenantId, 0); logger.info('QR generation counter reset for tenant', { tenantId }); } /** * Check if tenant can generate more QR codes * @param {number} tenantId - Tenant ID * @returns {boolean} True if can generate */ canGenerateQR(tenantId) { const count = this.tenantCounters.get(tenantId) || 0; return count < this.maxQrGenerations; } /** * Get QR generation stats for tenant * @param {number} tenantId - Tenant ID * @returns {Object} QR stats */ getStats(tenantId) { return { tenantId, attempts: this.tenantCounters.get(tenantId) || 0, maxAttempts: this.maxQrGenerations, hasQR: this.tenantQRCodes.has(tenantId), canGenerate: this.canGenerateQR(tenantId) }; } /** * Clean up tenant data * @param {number} tenantId - Tenant ID */ cleanup(tenantId) { this.clearQR(tenantId); logger.info('QR handler cleaned up for tenant', { tenantId }); } /** * Get all active tenants with QR codes * @returns {Array<number>} Array of tenant IDs */ getActiveTenants() { return Array.from(this.tenantQRCodes.keys()); } } module.exports = WhatsAppQRHandler; 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