@adopture/next
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Next.js SDK for Adopture feature adoption tracking with SSR support
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value);\n } else if (value !== undefined) {\n result[key] = value as any;\n }\n }\n }\n\n return result;\n}\n\n/**\n * Debounce function calls\n */\nexport function debounce<T extends (...args: any[]) => any>(\n func: T,\n wait: number\n): (...args: Parameters<T>) => void {\n let timeout: NodeJS.Timeout | null = null;\n \n return (...args: Parameters<T>) => {\n if (timeout) {\n clearTimeout(timeout);\n }\n \n timeout = setTimeout(() => {\n func(...args);\n }, wait);\n };\n}\n\n/**\n * Throttle function calls\n */\nexport function throttle<T extends (...args: any[]) => any>(\n func: T,\n limit: number\n): (...args: Parameters<T>) => void {\n let inThrottle = false;\n \n return (...args: Parameters<T>) => {\n if (!inThrottle) {\n func(...args);\n inThrottle = true;\n setTimeout(() => {\n inThrottle = false;\n }, limit);\n }\n };\n}\n\n/**\n * Get current timestamp in milliseconds\n */\nexport function now(): number {\n return Date.now();\n}\n\n/**\n * Format timestamp to ISO string\n 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lastError!;\n}\n\n/**\n * Create a timeout promise that rejects after a delay\n */\nexport function timeout<T>(promise: Promise<T>, ms: number): Promise<T> {\n return Promise.race([\n promise,\n new Promise<never>((_, reject) => {\n setTimeout(() => {\n reject(new Error(`Operation timed out after ${ms}ms`));\n }, ms);\n }),\n ]);\n}\n\n/**\n * Sanitize metadata to remove sensitive information\n */\nexport function sanitizeMetadata(metadata: Record<string, any>): Record<string, any> {\n const sensitiveKeys = ['password', 'token', 'secret', 'key', 'auth', 'credential'];\n const result: Record<string, any> = {};\n \n for (const [key, value] of Object.entries(metadata)) {\n const lowerKey = key.toLowerCase();\n const isSensitive = sensitiveKeys.some(sensitiveKey => lowerKey.includes(sensitiveKey));\n \n if (isSensitive) {\n result[key] = '[REDACTED]';\n } else if (typeof value === 'object' && value !== null) {\n result[key] = sanitizeMetadata(value);\n } else {\n result[key] = value;\n }\n 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pattern));\n }\n \n return false;\n}\n\n/**\n * Match route against pattern (supports wildcards)\n */\nexport function matchRoute(route: string, pattern: string): boolean {\n // Convert pattern to regex (replace * with .*)\n const regexPattern = pattern.replace(/\\*/g, '.*').replace(/\\//g, '\\\\/');\n const regex = new RegExp(`^${regexPattern}$`);\n \n return regex.test(route);\n}\n\n/**\n * Extract user ID from various sources\n */\nexport function extractUserId(\n headers: Headers,\n cookies?: { [key: string]: string },\n customExtractor?: (headers: Headers) => string | null\n): string | null {\n // Try custom extractor first\n if (customExtractor) {\n const customId = customExtractor(headers);\n if (customId) {\n return customId;\n }\n }\n \n // Try common header patterns\n const authHeader = headers.get('authorization');\n if (authHeader) {\n // Extract from Bearer token or similar\n const match = authHeader.match(/user[_-]?id[=:]([a-zA-Z0-9-_]+)/i);\n if (match) {\n return 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type { MiddlewareConfig } from './types';\nimport { shouldExcludeRoute, extractUserId, sanitizeMetadata, now } from './shared/utils';\n\n/**\n * Adopture middleware for Next.js\n * Tracks route changes and performance metrics at the edge\n */\nexport function createAdoptureMiddleware(config: MiddlewareConfig) {\n return async function adoptureMiddleware(request: NextRequest): Promise<NextResponse> {\n const startTime = now();\n const pathname = request.nextUrl.pathname;\n \n // Check if route should be tracked\n if (shouldExcludeRoute(pathname, config.excludeRoutes, config.includeRoutes)) {\n return NextResponse.next();\n }\n\n // Extract user ID from request\n const userId = config.userIdExtractor?.(request) || extractUserIdFromHeaders(request.headers);\n \n // Extract metadata from request\n const metadata = {\n ...(config.metadataExtractor?.(request) || {}),\n pathname,\n method: request.method,\n userAgent: request.headers.get('user-agent') || '',\n referer: request.headers.get('referer') || '',\n ip: getClientIP(request),\n country: (request as any).geo?.country || '',\n city: (request as any).geo?.city || '',\n region: (request as any).geo?.region || '',\n };\n\n let response: NextResponse;\n let success = true;\n let error: string | null = null;\n\n try {\n response = NextResponse.next();\n } catch (e) {\n success = false;\n error = e instanceof Error ? e.message : 'Unknown error';\n response = NextResponse.next();\n }\n\n // Track route access if enabled\n if (config.enableRouteTracking && userId) {\n const routeEvent = {\n featureId: `route-${pathname.replace(/[^a-zA-Z0-9_.-]/g, '-')}`,\n userId,\n metadata: sanitizeMetadata({\n ...metadata,\n success,\n error,\n duration: now() - startTime,\n }),\n timestamp: startTime,\n };\n\n // Send event asynchronously to avoid blocking the response\n sendTrackingEvent(config, 'route', routeEvent).catch(err => {\n console.error('[ADOPTURE-MIDDLEWARE] Failed to send route event:', err);\n });\n }\n\n // Track performance metrics if enabled\n if (config.enablePerformanceTracking && userId) {\n const performanceEvent = {\n featureId: 'middleware:performance',\n userId,\n metadata: sanitizeMetadata({\n ...metadata,\n responseTime: now() - startTime,\n success,\n error,\n }),\n timestamp: startTime,\n };\n\n // Send event asynchronously\n sendTrackingEvent(config, 'performance', performanceEvent).catch(err => {\n console.error('[ADOPTURE-MIDDLEWARE] Failed to send performance event:', err);\n });\n }\n\n // Add tracking headers to response (for client-side correlation)\n response.headers.set('x-adopture-request-id', generateRequestId());\n response.headers.set('x-adopture-timestamp', startTime.toString());\n \n if (userId) {\n response.headers.set('x-adopture-user-id', userId);\n }\n\n return response;\n };\n}\n\n/**\n * Send tracking event to Adopture API\n */\nasync function sendTrackingEvent(\n config: MiddlewareConfig,\n type: string,\n event: any\n): Promise<void> {\n const payload = {\n type,\n event,\n timestamp: now(),\n source: 'middleware',\n };\n\n try {\n // Convert to tRPC format for middleware events\n const tRPCPayload = {\n projectId: '35207190-2644-4230-b088-9ada94638e5d',\n featureId: event.featureId || `route-${payload.type}`,\n userId: event.userId || 'anonymous',\n eventType: 'feature_exposed' as const,\n sessionId: event.sessionId || `middleware-${Date.now()}`,\n metadata: event.metadata || {}\n };\n \n const response = await fetch(`${config.apiUrl || 'http://localhost:3001'}/trpc/featureAdoption.trackEvent`, {\n method: 'POST',\n headers: {\n 'Content-Type': 'application/json',\n 'Authorization': `Bearer ${config.apiKey}`,\n 'User-Agent': 'adopture-next-middleware/0.1.0',\n },\n body: JSON.stringify(tRPCPayload),\n });\n\n if (!response.ok) {\n const errorText = await response.text();\n throw new Error(`HTTP ${response.status}: ${errorText}`);\n }\n } catch (error) {\n // Re-throw for caller to handle\n throw error;\n }\n}\n\n/**\n * Extract user ID from request headers\n */\nfunction extractUserIdFromHeaders(headers: Headers): string | null {\n // Try authorization header\n const authHeader = headers.get('authorization');\n if (authHeader) {\n // Extract from Bearer token\n const match = authHeader.match(/Bearer\\s+(.+)/i);\n if (match) {\n // Try to decode user ID from token (simplified)\n try {\n const tokenParts = match[1].split('.');\n if (tokenParts.length === 3) {\n // JWT-like token\n const payload = JSON.parse(atob(tokenParts[1]));\n return payload.sub || payload.userId || payload.user_id || null;\n }\n } catch {\n // Not a JWT, continue\n }\n }\n }\n\n // Try custom headers\n const userIdHeader = headers.get('x-user-id') || \n headers.get('x-user') || \n headers.get('user-id');\n if (userIdHeader) {\n return userIdHeader;\n }\n\n // Try cookie header\n const cookieHeader = headers.get('cookie');\n if (cookieHeader) {\n const cookies = parseCookies(cookieHeader);\n return cookies.userId || cookies.user_id || cookies['user-id'] || null;\n }\n\n return null;\n}\n\n/**\n * Get client IP address from request\n */\nfunction getClientIP(request: NextRequest): string {\n // Try various headers for client IP\n const forwardedFor = request.headers.get('x-forwarded-for');\n if (forwardedFor) {\n return forwardedFor.split(',')[0].trim();\n }\n\n const realIP = request.headers.get('x-real-ip');\n if (realIP) {\n return realIP;\n }\n\n const cfConnectingIP = request.headers.get('cf-connecting-ip');\n if (cfConnectingIP) {\n return cfConnectingIP;\n }\n\n return (request as any).ip || 'unknown';\n}\n\n/**\n * Parse cookie header string into object\n */\nfunction parseCookies(cookieHeader: string): { [key: string]: string } {\n const cookies: { [key: string]: string } = {};\n \n cookieHeader.split(';').forEach(cookie => {\n const [name, ...rest] = cookie.split('=');\n if (name && rest.length > 0) {\n cookies[name.trim()] = rest.join('=').trim();\n }\n });\n\n return cookies;\n}\n\n/**\n * Generate unique request ID\n */\nfunction generateRequestId(): string {\n return Math.random().toString(36).substring(2) + Date.now().toString(36);\n}\n\n/**\n * Utility function to create a basic middleware with minimal configuration\n */\nexport function simpleAdoptureMiddleware(apiKey: string, options?: {\n enableRouteTracking?: boolean;\n enablePerformanceTracking?: boolean;\n excludeRoutes?: string[];\n}) {\n return createAdoptureMiddleware({\n apiKey,\n enableRouteTracking: options?.enableRouteTracking ?? true,\n enablePerformanceTracking: options?.enablePerformanceTracking ?? false,\n excludeRoutes: options?.excludeRoutes,\n });\n}\n\n/**\n * Higher-order middleware that wraps existing middleware with Adopture tracking\n */\nexport function withAdoptureTracking<T extends NextRequest>(\n middleware: (request: T) => NextResponse | Promise<NextResponse>,\n config: MiddlewareConfig\n) {\n return async function wrappedMiddleware(request: T): Promise<NextResponse> {\n const adoptureMiddleware = createAdoptureMiddleware(config);\n \n // Run Adopture tracking first\n await adoptureMiddleware(request);\n \n // Then run the original middleware\n return middleware(request);\n };\n}\n\n/**\n * Configuration helper for common middleware patterns\n */\nexport const middlewarePresets = {\n /**\n * Basic tracking for all routes\n */\n basic: (apiKey: string): MiddlewareConfig => ({\n apiKey,\n enableRouteTracking: true,\n enablePerformanceTracking: false,\n }),\n\n /**\n * API-focused tracking\n */\n api: (apiKey: string): MiddlewareConfig => ({\n apiKey,\n enableRouteTracking: true,\n enablePerformanceTracking: true,\n includeRoutes: ['/api/*'],\n }),\n\n /**\n * Page-focused tracking (exclude API routes)\n */\n pages: (apiKey: string): MiddlewareConfig => ({\n apiKey,\n enableRouteTracking: true,\n enablePerformanceTracking: false,\n excludeRoutes: ['/api/*', '/_next/*', '/favicon.ico'],\n }),\n\n /**\n * Full tracking with performance metrics\n */\n full: (apiKey: string): MiddlewareConfig => ({\n apiKey,\n enableRouteTracking: true,\n enablePerformanceTracking: true,\n excludeRoutes: ['/_next/*', '/favicon.ico'],\n }),\n};"]}