perplexity-policy-guardrails

# Perplexity Policy Guardrails ## Overview Policy enforcement for Perplexity Sonar API. Since Perplexity performs live web searches, guardrails must address: query content moderation (what users can search for), citation reliability (filtering low-quality sources), cost control (model selection + token limits), and responsible AI usage. ## Policy Pipeline ``` User Query │ ▼ Query Moderation (block harmful queries) │ ▼ PII Sanitization (strip personal data) │ ▼ Quota Check (daily limit by user tier) │ ▼ Model Selection (enforce tier-appropriate model) │ ▼ Perplexity API Call │ ▼ Citation Quality Scoring (filter low-trust sources) │ ▼ Response to User ``` ## Prerequisites - Perplexity API configured - Content moderation policy defined - User tier system in place - Redis for quota tracking (optional: in-memory for simple apps) ## Instructions ### Step 1: Query Content Moderation ```typescript const BLOCKED_PATTERNS = [ /\b(write|generate|create)\s+(malware|virus|exploit|ransomware)\b/i, /\b(personal|private)\s+(address|phone|ssn)\s+of\s+\w+/i, /\b(bypass|circumvent|hack)\s+(security|firewall|authentication)\b/i, /\b(how to|tutorial)\s+(stalk|dox|harass)\b/i, ]; const MAX_QUERY_LENGTH = 2000; class PolicyError extends Error { constructor(public code: string, message: string) { super(message); this.name = "PolicyError"; } } function moderateQuery(query: string): string { if (query.length > MAX_Q...