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

Next.js middleware for AgentShield AI agent detection

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* Edge Runtime Compatible WASM Loader for AgentShield\n *\n * This module provides a pre-built solution for loading WASM in Edge Runtime.\n * It requires the WASM file to be manually placed in the project.\n */\n\nimport type { NextRequest } from 'next/server';\n\n// User must provide the WASM module via import\n// This is intentionally not imported here to allow user control\nexport interface WasmModule {\n  default: WebAssembly.Module;\n}\n\nexport interface DetectionResult {\n  isAgent: boolean;\n  confidence: number;\n  agent?: string;\n  verificationMethod: 'cryptographic' | 'pattern';\n  riskLevel?: 'low' | 'medium' | 'high' | 'critical';\n  timestamp: string;\n}\n\nexport interface AgentShieldConfig {\n  wasmModule?: WebAssembly.Module;\n  enableWasm?: boolean;\n  onAgentDetected?: (result: DetectionResult) => void;\n  blockAgents?: boolean;\n  allowedAgents?: string[];\n  debug?: boolean;\n}\n\ninterface WasmExports {\n  detect_agent(metadataPtr: number, metadataLen: number): number;\n  get_version(): number;\n  __wbindgen_malloc(size: number): number;\n  __wbindgen_free(ptr: number, size: number): void;\n  __wbindgen_realloc(ptr: number, oldSize: number, newSize: number): number;\n  memory: WebAssembly.Memory;\n}\n\nclass EdgeRuntimeAgentShield {\n  private wasmInstance: WebAssembly.Instance | null = null;\n  private wasmMemory: WebAssembly.Memory | null = null;\n  private config: AgentShieldConfig;\n  private initialized = false;\n\n  constructor(config: AgentShieldConfig = {}) {\n    this.config = config;\n  }\n\n  async init(wasmModule?: WebAssembly.Module): Promise<void> {\n    if (this.initialized) return;\n\n    const module = wasmModule || this.config.wasmModule;\n\n    if (module && this.config.enableWasm !== false) {\n      try {\n        this.wasmMemory = new WebAssembly.Memory({ initial: 17, maximum: 256 });\n\n        const imports = {\n          wbg: {\n            __wbindgen_throw: (ptr: number, len: number) => {\n              throw new Error(this.readString(ptr, len));\n            },\n            __wbg_log_: (ptr: number, len: number) => {\n              if (this.config.debug) {\n                console.log(this.readString(ptr, len));\n              }\n            },\n          },\n          env: {\n            memory: this.wasmMemory,\n          },\n        };\n\n        this.wasmInstance = await WebAssembly.instantiate(module, imports);\n        this.initialized = true;\n\n        if (this.config.debug) {\n          console.log('✅ AgentShield WASM initialized in Edge Runtime');\n        }\n      } catch (error) {\n        console.warn('⚠️ WASM initialization failed, using pattern detection:', error);\n        this.initialized = true;\n      }\n    } else {\n      this.initialized = true;\n    }\n  }\n\n  private readString(ptr: number, len: number): string {\n    if (!this.wasmInstance || !this.wasmMemory) {\n      throw new Error('WASM not initialized');\n    }\n    const memory = new 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detection first\n    if (this.wasmInstance && this.config.enableWasm !== false) {\n      try {\n        const exports = this.wasmInstance.exports as unknown as WasmExports;\n        const [ptr, len] = this.writeString(JSON.stringify(metadata));\n\n        const resultPtr = exports.detect_agent(ptr, len);\n        // Read result with dynamic size\n        let resultStr = '';\n        let offset = 0;\n        const memory = new Uint8Array((exports.memory as WebAssembly.Memory).buffer);\n\n        // Read until we find the end of the JSON string\n        while (offset < 4096) {\n          // Max 4KB result\n          const byte = memory[resultPtr + offset];\n          if (byte === 0 || byte === undefined) break;\n          offset++;\n        }\n\n        if (offset > 0) {\n          resultStr = this.readString(resultPtr, offset);\n        }\n\n        exports.__wbindgen_free(ptr, len);\n        if (offset > 0) {\n          exports.__wbindgen_free(resultPtr, offset);\n        }\n\n        const result = JSON.parse(resultStr);\n\n        const detection: DetectionResult = {\n          ...result,\n          verificationMethod: 'cryptographic',\n          timestamp: new Date().toISOString(),\n        };\n\n        if (this.config.onAgentDetected && detection.isAgent) {\n          this.config.onAgentDetected(detection);\n        }\n\n        return detection;\n      } catch (error) {\n        if (this.config.debug) {\n          console.error('WASM detection failed:', error);\n        }\n        // Fall through to pattern detection\n      }\n    }\n\n    // Fallback: Pattern-based detection\n    return this.patternDetection(metadata);\n  }\n\n  private patternDetection(metadata: {\n    userAgent: string;\n    ipAddress: string;\n    headers: Record<string, string>;\n  }): DetectionResult {\n    const userAgent = metadata.userAgent.toLowerCase();\n\n    // Enhanced AI agent patterns with confidence scores\n    const patterns = [\n      // High confidence - explicit AI identifiers\n      { pattern: /chatgpt-user/i, name: 'ChatGPT', confidence: 0.95 },\n      { pattern: /claude-web/i, name: 'Claude', confidence: 0.95 },\n      { pattern: /gpt-crawler/i, name: 'GPT Crawler', confidence: 0.95 },\n      { pattern: /perplexitybot/i, name: 'Perplexity', confidence: 0.95 },\n      { pattern: /perplexity-user/i, name: 'Perplexity', confidence: 0.95 },\n      { pattern: /perplexity-ai/i, name: 'Perplexity', confidence: 0.95 },\n\n      // Medium-high confidence - company identifiers\n      { pattern: /anthropic/i, name: 'Anthropic', confidence: 0.9 },\n      { pattern: /openai/i, name: 'OpenAI', confidence: 0.9 },\n\n      // Medium confidence - product names\n      { pattern: /copilot/i, name: 'GitHub Copilot', confidence: 0.85 },\n      { pattern: /bard/i, name: 'Google Bard', confidence: 0.85 },\n      { pattern: /gemini/i, name: 'Google Gemini', confidence: 0.85 },\n      { pattern: /perplexity/i, name: 'Perplexity', confidence: 0.85 }, // Fallback\n      { pattern: /you\\.com/i, name: 'You.com', confidence: 0.8 },\n      { pattern: /phind/i, name: 'Phind', confidence: 0.8 },\n    ];\n\n    // Check for suspicious headers\n    const suspiciousHeaders = ['x-openai-', 'x-anthropic-', 'x-ai-', 'x-llm-', 'x-gpt-'];\n\n    let headerBoost = 0;\n    for (const [key] of Object.entries(metadata.headers)) {\n      if (suspiciousHeaders.some((prefix) => key.toLowerCase().startsWith(prefix))) {\n        headerBoost = 0.1;\n        break;\n      }\n    }\n\n    // Check patterns - patterns are ordered by confidence (highest first: 0.95, 0.90, 0.85...)\n    // so breaking on first match returns the highest-confidence match\n    for (const { pattern, name, confidence } of patterns) {\n      if (pattern.test(userAgent)) {\n        const finalConfidence = Math.min(confidence + headerBoost, 1.0);\n\n        const result: DetectionResult = {\n          isAgent: true,\n          confidence: finalConfidence,\n          agent: name,\n          verificationMethod: 'pattern',\n          riskLevel: finalConfidence > 0.9 ? 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