format

Author: dferber90

apps/docs/lib/ai-agent-detection.ts

@@ -18,84 +18,84 @@
 // Layer 1: Known AI agent UA substrings (lowercase).
 const AI_AGENT_UA_PATTERNS = [
   // Anthropic — https://support.claude.com/en/articles/8896518
-  "claudebot",
-  "claude-searchbot",
-  "claude-user",
-  "anthropic-ai",
-  "claude-web",
+  'claudebot',
+  'claude-searchbot',
+  'claude-user',
+  'anthropic-ai',
+  'claude-web',
 
   // OpenAI — https://platform.openai.com/docs/bots
-  "chatgpt",
-  "gptbot",
-  "oai-searchbot",
-  "openai",
+  'chatgpt',
+  'gptbot',
+  'oai-searchbot',
+  'openai',
 
   // Google AI
-  "gemini",
-  "bard",
-  "google-cloudvertexbot",
-  "google-extended",
+  'gemini',
+  'bard',
+  'google-cloudvertexbot',
+  'google-extended',
 
   // Meta
-  "meta-externalagent",
-  "meta-externalfetcher",
-  "meta-webindexer",
+  'meta-externalagent',
+  'meta-externalfetcher',
+  'meta-webindexer',
 
   // Search/Research AI
-  "perplexity",
-  "youbot",
-  "you.com",
-  "deepseekbot",
+  'perplexity',
+  'youbot',
+  'you.com',
+  'deepseekbot',
 
   // Coding assistants
-  "cursor",
-  "github-copilot",
-  "codeium",
-  "tabnine",
-  "sourcegraph",
+  'cursor',
+  'github-copilot',
+  'codeium',
+  'tabnine',
+  'sourcegraph',
 
   // Other AI agents / data scrapers (low-harm to serve markdown)
-  "cohere-ai",
-  "bytespider",
-  "amazonbot",
-  "ai2bot",
-  "diffbot",
-  "omgili",
-  "omgilibot",
+  'cohere-ai',
+  'bytespider',
+  'amazonbot',
+  'ai2bot',
+  'diffbot',
+  'omgili',
+  'omgilibot',
 ];
 
 // Layer 2: Known AI service URLs in Signature-Agent header (RFC 9421).
-const SIGNATURE_AGENT_DOMAINS = ["chatgpt.com"];
+const SIGNATURE_AGENT_DOMAINS = ['chatgpt.com'];
 
 // Layer 3: Traditional bot exclusion list — bots that should NOT trigger
 // the heuristic layer (they're search engine crawlers, social previews, or
 // monitoring tools, not AI agents).
 const TRADITIONAL_BOT_PATTERNS = [
-  "googlebot",
-  "bingbot",
-  "yandexbot",
-  "baiduspider",
-  "duckduckbot",
-  "slurp",
-  "msnbot",
-  "facebot",
-  "twitterbot",
-  "linkedinbot",
-  "whatsapp",
-  "telegrambot",
-  "pingdom",
-  "uptimerobot",
-  "newrelic",
-  "datadog",
-  "statuspage",
-  "site24x7",
-  "applebot",
+  'googlebot',
+  'bingbot',
+  'yandexbot',
+  'baiduspider',
+  'duckduckbot',
+  'slurp',
+  'msnbot',
+  'facebot',
+  'twitterbot',
+  'linkedinbot',
+  'whatsapp',
+  'telegrambot',
+  'pingdom',
+  'uptimerobot',
+  'newrelic',
+  'datadog',
+  'statuspage',
+  'site24x7',
+  'applebot',
 ];
 
 // Broad regex for bot-like UA strings (used only in Layer 3 heuristic).
 const BOT_LIKE_REGEX = /bot|agent|fetch|crawl|spider|search/i;
 
-export type DetectionMethod = "ua-match" | "signature-agent" | "heuristic";
+export type DetectionMethod = 'ua-match' | 'signature-agent' | 'heuristic';
 
 export interface DetectionResult {
   detected: boolean;
@@ -111,36 +111,36 @@ export interface DetectionResult {
 export function isAIAgent(request: {
   headers: { get(name: string): string | null };
 }): DetectionResult {
-  const userAgent = request.headers.get("user-agent");
+  const userAgent = request.headers.get('user-agent');
 
   // Layer 1: Known UA pattern match
   if (userAgent) {
     const lowerUA = userAgent.toLowerCase();
     if (AI_AGENT_UA_PATTERNS.some((pattern) => lowerUA.includes(pattern))) {
-      return { detected: true, method: "ua-match" };
+      return { detected: true, method: 'ua-match' };
     }
   }
 
   // Layer 2: Signature-Agent header (RFC 9421, used by ChatGPT agent)
-  const signatureAgent = request.headers.get("signature-agent");
+  const signatureAgent = request.headers.get('signature-agent');
   if (signatureAgent) {
     const lowerSig = signatureAgent.toLowerCase();
     if (SIGNATURE_AGENT_DOMAINS.some((domain) => lowerSig.includes(domain))) {
-      return { detected: true, method: "signature-agent" };
+      return { detected: true, method: 'signature-agent' };
     }
   }
 
   // Layer 3: Missing browser fingerprint heuristic
   // Real browsers (Chrome 76+, Firefox 90+, Safari 16.4+) send sec-fetch-mode
   // on navigation requests. Its absence signals a programmatic client.
-  const secFetchMode = request.headers.get("sec-fetch-mode");
+  const secFetchMode = request.headers.get('sec-fetch-mode');
   if (!secFetchMode && userAgent && BOT_LIKE_REGEX.test(userAgent)) {
     const lowerUA = userAgent.toLowerCase();
     const isTraditionalBot = TRADITIONAL_BOT_PATTERNS.some((pattern) =>
-      lowerUA.includes(pattern)
+      lowerUA.includes(pattern),
     );
     if (!isTraditionalBot) {
-      return { detected: true, method: "heuristic" };
+      return { detected: true, method: 'heuristic' };
     }
   }