@kya-os/agentshield-nextjs/dist/edge/index.mjs.map

Next.js middleware for AgentShield AI agent detection

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* Edge Runtime Middleware with WASM Support\n *\n * This module provides Next.js middleware that uses the unified WASM runtime.\n * For Edge Runtime, consumers must provide a pre-compiled WASM module via static import:\n *\n * ```typescript\n * // In your middleware.ts\n * import wasmModule from '@kya-os/agentshield-wasm-runtime/wasm?module';\n * import { createEdgeMiddleware } from '@kya-os/agentshield-nextjs/edge';\n *\n * export const middleware = createEdgeMiddleware({\n *   wasmModule,\n *   apiKey: process.env.AGENTSHIELD_API_KEY,\n *   onAgentDetected: 'block',\n * });\n * ```\n *\n * When an API key is provided, the middleware will:\n * 1. Load customer policies (deny lists, allow lists, thresholds) from AgentShield API\n * 2. Automatically block agents that match deny list entries\n * 3. Cache policies for 5 minutes with background refresh\n */\n\nimport { NextRequest, NextResponse } from 'next/server';\nimport type { DetectionResult } from '@kya-os/agentshield-shared';\n\n/**\n * Edge middleware configuration\n */\nexport interface EdgeMiddlewareConfig {\n  /**\n   * Pre-compiled WebAssembly.Module for Edge Runtime\n   * Use static import: `import wasmModule from '@kya-os/agentshield-wasm-runtime/wasm?module'`\n   */\n  wasmModule?: WebAssembly.Module;\n\n  /**\n   * API key for loading customer policies from AgentShield dashboard\n   * When provided, enables policy enforcement (deny lists, allow lists, thresholds)\n   */\n  apiKey?: string;\n\n  /**\n   * Custom URL for the policy API\n   * @default 'https://api.agentshield.io'\n   */\n  policyApiUrl?: string;\n\n  /**\n   * Action to take when an agent is detected\n   * @default 'log'\n   */\n  onAgentDetected?: 'block' | 'redirect' | 'rewrite' | 'log' | 'allow';\n\n  /**\n   * Custom handler called when an agent is detected\n   * Return a NextResponse to override default behavior\n   */\n  onDetection?: (\n    request: NextRequest,\n    result: DetectionResult\n  ) => Promise<NextResponse | void> | NextResponse | void;\n\n  /**\n   * Paths to skip detection (can be string prefixes or RegExp)\n   */\n  skipPaths?: (string | RegExp)[];\n\n  /**\n   * Minimum confidence threshold (0-100 scale) for considering a request as agent traffic\n   * @default 70\n   */\n  confidenceThreshold?: number;\n\n  /**\n   * Response to send when blocking agents\n   */\n  blockedResponse?: {\n    status?: number;\n    message?: string;\n    headers?: Record<string, string>;\n  };\n\n  /**\n   * URL to redirect to when redirecting agents\n   */\n  redirectUrl?: string;\n\n  /**\n   * URL to rewrite to when rewriting agent requests\n   */\n  rewriteUrl?: string;\n\n  /**\n   * Enable debug logging\n   */\n  debug?: boolean;\n}\n\n/**\n * Detection input extracted from request\n */\ninterface DetectionInput {\n  userAgent?: string;\n  ipAddress?: string;\n  headers: Record<string, string>;\n  url?: string;\n  method?: string;\n}\n\n/**\n * Simple edge-safe detector that uses pattern matching\n * Falls back to this when WASM is not available\n */\nasync function patternDetect(input: DetectionInput): Promise<DetectionResult> {\n  const userAgent = input.userAgent?.toLowerCase() || '';\n  const reasons: string[] = [];\n  let confidence = 0;\n  let detectedAgent: { type: string; name: string } | undefined;\n\n  // AI agent patterns with confidence scores (0-100 scale)\n  const patterns = [\n    { pattern: /chatgpt-user/i, name: 'ChatGPT', confidence: 95 },\n    { pattern: /claude-web/i, name: 'Claude', confidence: 95 },\n    { pattern: /claude-?bot/i, name: 'ClaudeBot', confidence: 95 },\n    { pattern: /anthropic/i, name: 'Claude', confidence: 90 },\n    { pattern: /gptbot/i, name: 'GPTBot', confidence: 90 },\n    { pattern: /perplexity/i, name: 'Perplexity', confidence: 90 },\n    { pattern: /openai/i, name: 'OpenAI', confidence: 85 },\n    { pattern: /copilot/i, name: 'Copilot', confidence: 85 },\n    { pattern: /gemini/i, name: 'Gemini', confidence: 85 },\n    { pattern: /bard/i, name: 'Bard', confidence: 85 },\n    // HTTP client libraries (often used by AI agents/scrapers)\n    { pattern: /^axios\\//i, name: 'HTTP Client (axios)', confidence: 75 },\n    { pattern: /^node-fetch\\//i, name: 'HTTP Client (node-fetch)', confidence: 75 },\n    { pattern: /^got\\//i, name: 'HTTP Client (got)', confidence: 75 },\n    { pattern: /^python-requests\\//i, name: 'HTTP Client (requests)', confidence: 75 },\n    { pattern: /^python-urllib/i, name: 'HTTP Client (urllib)', confidence: 75 },\n    { pattern: /^curl\\//i, name: 'HTTP Client (curl)', confidence: 60 },\n    { pattern: /^wget\\//i, name: 'HTTP Client (wget)', confidence: 60 },\n    { pattern: /^httpie\\//i, name: 'HTTP Client (httpie)', confidence: 70 },\n    { pattern: /^undici\\//i, name: 'HTTP Client (undici)', confidence: 75 },\n  ];\n\n  for (const { pattern, name, confidence: patternConfidence } of patterns) {\n    if (pattern.test(userAgent)) {\n      confidence = patternConfidence;\n      detectedAgent = { type: name.toLowerCase(), name };\n      reasons.push(`known_pattern:${name.toLowerCase()}`);\n      break;\n    }\n  }\n\n  // Check for AI-specific headers\n  const aiHeaders = ['x-openai-', 'x-anthropic-', 'x-ai-', 'signature-agent'];\n  for (const [key] of Object.entries(input.headers)) {\n    if (aiHeaders.some((prefix) => key.toLowerCase().startsWith(prefix))) {\n      confidence = Math.max(confidence, 45);\n      reasons.push(`ai_headers:${key}`);\n      break;\n    }\n  }\n\n  return {\n    isAgent: confidence > 30,\n    confidence,\n    detectionClass:\n      confidence > 30 && detectedAgent\n        ? { type: 'AiAgent' as const, agentType: detectedAgent.name }\n        : confidence > 30\n          ? { type: 'Unknown' as const }\n          : { type: 'Human' as const },\n    signals: [],\n    ...(detectedAgent && { detectedAgent }),\n    reasons,\n    verificationMethod: 'pattern' as const,\n    forgeabilityRisk: confidence > 80 ? 'medium' : 'high',\n    timestamp: new Date(),\n  };\n}\n\n/**\n * Extended detection result with policy enforcement\n */\ninterface PolicyEnforcedResult extends DetectionResult {\n  shouldBlock?: boolean;\n  blockReason?: 'deny_list' | 'not_in_allow_list' | 'threshold';\n}\n\n/**\n * Create detector using WASM runtime or fallback\n * When apiKey is provided, policy enforcement is enabled\n */\nasync function createDetector(config: EdgeMiddlewareConfig) {\n  let detector: {\n    detect: (input: DetectionInput) => Promise<PolicyEnforcedResult>;\n    isReady: () => boolean;\n  };\n\n  // Try to use wasm-runtime if WASM module is provided\n  if (config.wasmModule) {\n    try {\n      const { StaticWasmLoader, WasmDetector, PolicyLoader } = await import(\n        '@kya-os/agentshield-wasm-runtime/edge'\n      );\n      const loader = new StaticWasmLoader(config.wasmModule);\n\n      // Create policy loader if API key is provided\n      const policyLoader = config.apiKey\n        ? new PolicyLoader({\n            apiUrl: config.policyApiUrl,\n          })\n        : undefined;\n\n      // Create detector with policy support\n      const wasmDetector = new WasmDetector(loader, policyLoader, {\n        apiKey: config.apiKey,\n        debug: config.debug,\n      });\n\n      await wasmDetector.ensureReady();\n\n      if (config.debug) {\n        console.debug('[AgentShield] WASM detector initialized in Edge Runtime', {\n          policyEnabled: !!config.apiKey,\n        });\n      }\n\n      detector = {\n        detect: async (input: DetectionInput): Promise<PolicyEnforcedResult> => {\n          const result = await wasmDetector.detect(input);\n          // Convert IDetectionResult to DetectionResult by adding required fields\n          // Type assertion needed due to different DetectionClass definitions\n          return {\n            isAgent: result.isAgent,\n            confidence: result.confidence,\n            detectionClass: result.detectionClass as DetectionResult['detectionClass'],\n            detectedAgent: result.detectedAgent,\n            verificationMethod: result.verificationMethod,\n            forgeabilityRisk: result.forgeabilityRisk,\n            reasons: result.reasons,\n            timestamp: result.timestamp,\n            signals: [], // Required by DetectionResult, empty for WASM results\n            shouldBlock: result.shouldBlock,\n            blockReason: result.blockReason as PolicyEnforcedResult['blockReason'],\n          };\n        },\n        isReady: () => wasmDetector.isReady(),\n      };\n    } catch (error) {\n      if (config.debug) {\n        console.warn('[AgentShield] WASM runtime not available, using pattern detection:', error);\n      }\n      detector = {\n        detect: patternDetect,\n        isReady: () => true,\n      };\n    }\n  } else {\n    // Use pattern-based detection\n    if (config.debug) {\n      console.debug('[AgentShield] No WASM module provided, using pattern detection');\n    }\n    detector = {\n      detect: patternDetect,\n      isReady: () => true,\n    };\n  }\n\n  return detector;\n}\n\n/**\n * Create Edge middleware with WASM support\n *\n * @example\n * ```typescript\n * // middleware.ts\n * import wasmModule from '@kya-os/agentshield-wasm-runtime/wasm?module';\n * import { createEdgeMiddleware } from '@kya-os/agentshield-nextjs/edge';\n *\n * export const middleware = createEdgeMiddleware({\n *   wasmModule,\n *   onAgentDetected: 'block',\n *   confidenceThreshold: 70,\n * });\n *\n * export const config = {\n *   matcher: ['/((?!_next/static|_next/image|favicon.ico).*)'],\n * };\n * ```\n */\nexport function createEdgeMiddleware(config: EdgeMiddlewareConfig = {}) {\n  let detectorPromise: Promise<Awaited<ReturnType<typeof createDetector>>> | null = null;\n\n  const {\n    onAgentDetected = 'log',\n    onDetection,\n    skipPaths = [],\n    confidenceThreshold = 70,\n    blockedResponse = {\n      status: 403,\n      message: 'Access denied: Automated agent detected',\n      headers: { 'Content-Type': 'application/json' },\n    },\n    redirectUrl = '/blocked',\n    rewriteUrl = '/blocked',\n    debug = false,\n  } = config;\n\n  return async (request: NextRequest): Promise<NextResponse> => {\n    try {\n      // Initialize detector lazily\n      if (!detectorPromise) {\n        detectorPromise = createDetector({ ...config, debug });\n      }\n      const detector = await detectorPromise;\n\n      // Check if path should be skipped\n      const shouldSkip = skipPaths.some((pattern) => {\n        if (typeof pattern === 'string') {\n          return request.nextUrl.pathname.startsWith(pattern);\n        }\n        return pattern.test(request.nextUrl.pathname);\n      });\n\n      if (shouldSkip) {\n        return NextResponse.next();\n      }\n\n      // Extract request context\n      const url = new URL(request.url);\n      // Parse X-Forwarded-For header to get client IP (first in comma-separated list)\n      const xForwardedFor = request.headers.get('x-forwarded-for');\n      const clientIp = xForwardedFor?.split(',')[0]?.trim();\n      const input: DetectionInput = {\n        userAgent: request.headers.get('user-agent') || undefined,\n        ipAddress: request.ip || clientIp || undefined,\n        headers: Object.fromEntries(request.headers.entries()),\n        url: url.pathname + url.search,\n        method: request.method,\n      };\n\n      // Run detection\n      const result = await detector.detect(input);\n\n      // POLICY ENFORCEMENT: Check shouldBlock from policy rules (deny list, allow list, threshold)\n      // This takes precedence over the general threshold check below\n      if (result.shouldBlock) {\n        if (debug) {\n          console.debug('[AgentShield] Blocked by policy', {\n            reason: result.blockReason,\n            agent: result.detectedAgent?.name,\n            confidence: result.confidence,\n            pathname: request.nextUrl.pathname,\n          });\n        }\n\n        // Call custom detection handler if provided\n        if (onDetection) {\n          const customResponse = await onDetection(request, result);\n          if (customResponse) {\n            return customResponse;\n          }\n        }\n\n        // Return 403 with policy block reason\n        return NextResponse.json(\n          {\n            error: 'Access denied by policy',\n            reason: result.blockReason,\n            detected: true,\n            confidence: result.confidence,\n            agent: result.detectedAgent?.name,\n            timestamp: result.timestamp,\n          },\n          {\n            status: 403,\n            headers: { 'Content-Type': 'application/json' },\n          }\n        );\n      }\n\n      // Check if agent detected above threshold (when policy doesn't block)\n      // Skip if shouldBlock === false (agent explicitly allowed by policy)\n      if (\n        result.shouldBlock !== false &&\n        result.isAgent &&\n        result.confidence >= confidenceThreshold\n      ) {\n        // Call custom detection handler if provided\n        if (onDetection) {\n          const customResponse = await onDetection(request, result);\n          if (customResponse) {\n            return customResponse;\n          }\n        }\n\n        // Handle based on configuration\n        switch (onAgentDetected) {\n          case 'block': {\n            const response = NextResponse.json(\n              {\n                error: blockedResponse.message,\n                detected: true,\n                confidence: result.confidence,\n                timestamp: result.timestamp,\n              },\n              { status: blockedResponse.status }\n            );\n\n            if (blockedResponse.headers) {\n              Object.entries(blockedResponse.headers).forEach(([key, value]) => {\n                response.headers.set(key, value);\n              });\n            }\n\n            return response;\n          }\n\n          case 'redirect':\n            return NextResponse.redirect(new URL(redirectUrl, request.url));\n\n          case 'rewrite':\n            return NextResponse.rewrite(new URL(rewriteUrl, request.url));\n\n          case 'log':\n            if (debug || process.env.NODE_ENV !== 'production') {\n              console.debug('AgentShield: Agent detected', {\n                ipAddress: input.ipAddress,\n                userAgent: input.userAgent,\n                confidence: result.confidence,\n                agent: result.detectedAgent?.name,\n                pathname: request.nextUrl.pathname,\n              });\n            }\n            break;\n\n          case 'allow':\n          default:\n            break;\n        }\n      }\n\n      // Continue with request\n      const response = NextResponse.next();\n\n      // Add detection headers\n      response.headers.set('x-agentshield-detected', result.isAgent.toString());\n      response.headers.set('x-agentshield-confidence', result.confidence.toString());\n      if (result.detectedAgent?.name) {\n        response.headers.set('x-agentshield-agent', result.detectedAgent.name);\n      }\n\n      return response;\n    } catch (error) {\n      console.error('AgentShield middleware error:', error);\n      return NextResponse.next();\n    }\n  };\n}\n\n// Re-export types for convenience\nexport type { DetectionResult };\n"]}