Add IP-based rate limiting (30 requests/hour) and contact info, update YouTube link

app.py

@@ -13,6 +13,7 @@ from typing import Tuple, Optional
 import requests
 from dotenv import load_dotenv
 from PIL import Image
+from collections import defaultdict, deque
 
 import gradio as gr
 from supabase import create_client, Client
@@ -74,6 +75,31 @@ except Exception as exc:  # noqa: BLE001
     print(f"[startup] Bucket check/create raised {exc!r}. Continuing…")
 
 
+# -----------------------------------------------------------------------------
+# Rate Limiting
+# -----------------------------------------------------------------------------
+
+# Rate limiter: 30 requests per IP per hour
+RATE_LIMIT_REQUESTS = 30
+RATE_LIMIT_WINDOW = 3600  # 1 hour in seconds
+request_tracker = defaultdict(deque)
+
+def check_rate_limit(client_ip: str) -> bool:
+    """Check if IP has exceeded rate limit. Returns True if allowed, False if blocked."""
+    current_time = time.time()
+    user_requests = request_tracker[client_ip]
+    
+    # Remove requests outside the time window
+    while user_requests and current_time - user_requests[0] > RATE_LIMIT_WINDOW:
+        user_requests.popleft()
+    
+    # Check if under limit
+    if len(user_requests) < RATE_LIMIT_REQUESTS:
+        user_requests.append(current_time)
+        return True
+    
+    return False
+
 # -----------------------------------------------------------------------------
 # Helper functions
 # -----------------------------------------------------------------------------
@@ -196,9 +222,14 @@ def _public_storage_url(path: str) -> str:
 # Main generate function
 # -----------------------------------------------------------------------------
 
-def generate(base_img: Image.Image, garment_img: Image.Image, workflow_choice: str) -> Image.Image:
+def generate(base_img: Image.Image, garment_img: Image.Image, workflow_choice: str, request: gr.Request) -> Image.Image:
     if base_img is None or garment_img is None:
         raise gr.Error("Please provide both images.")
+    
+    # Rate limiting check
+    client_ip = request.client.host if request and request.client else "unknown"
+    if not check_rate_limit(client_ip):
+        raise gr.Error("Rate limit exceeded. Please try again later (30 requests per hour limit).")
 
     # 1. Persist both images to Supabase storage
     job_id = str(uuid.uuid4())