Create app.py

app.py

@@ -0,0 +1,75 @@
+from flask import Flask, request, Response
+import requests
+from cachetools import TTLCache
+
+app = Flask(__name__)
+
+# Configure the cache
+cache = TTLCache(maxsize=1000000, ttl=30000)  # Cache up to 1000 entries for 5 minutes
+
+# NextDNS endpoint
+NEXTDNS_ENDPOINT = "https://dns.nextdns.io/7df33f"
+
+# Stats counters
+total_requests = 0
+cache_misses = 0
+cache_hits = 0
+
+@app.route('/', methods=['GET', 'POST'])
+def handle_request():
+    global total_requests, cache_misses, cache_hits
+    total_requests += 1
+
+    # Handle GET requests with 'dns' parameter
+    if request.method == 'GET' and 'dns' in request.args:
+        dns_query = request.args.get('dns')
+        cached_response = cache.get(dns_query)
+        if cached_response:
+            cache_hits += 1
+            return Response(cached_response, mimetype='application/dns-message')
+        else:
+            cache_misses += 1
+            response = requests.get(f"{NEXTDNS_ENDPOINT}?dns={dns_query}", headers={'Accept': 'application/dns-message'})
+            if response.status_code == 200:
+                cache[dns_query] = response.content
+                return Response(response.content, mimetype='application/dns-message')
+
+    # Handle POST requests with 'application/dns-message' content type
+    elif request.method == 'POST' and request.headers.get('Content-Type') == 'application/dns-message':
+        dns_query = request.data
+        cached_response = cache.get(dns_query)
+        if cached_response:
+            cache_hits += 1
+            return Response(cached_response, mimetype='application/dns-message')
+        else:
+            cache_misses += 1
+            response = requests.post(NEXTDNS_ENDPOINT, headers={'Accept': 'application/dns-message', 'Content-Type': 'application/dns-message'}, data=dns_query)
+            if response.status_code == 200:
+                cache[dns_query] = response.content
+                return Response(response.content, mimetype='application/dns-message')
+
+    # Handle GET requests with 'application/dns-json' Accept header
+    elif request.method == 'GET' and request.headers.get('Accept') == 'application/dns-json':
+        # Assuming JSON queries are not cached for simplicity, adjust as needed
+        total_requests += 1
+        cache_misses += 1
+        response = requests.get(NEXTDNS_ENDPOINT + request.full_path, headers={'Accept': 'application/dns-json'})
+        return Response(response.content, mimetype='application/dns-json')
+
+    # Return an error for unsupported requests
+    else:
+        return Response("DoH Gateway Provided by NextDNS", status=444)
+
+@app.route('/stats')
+def show_stats():
+    stats = f"""
+============
+Total DNS Request: {total_requests}
+Domain Cached: {cache_misses}
+Domain Cached Hit: {cache_hits}
+============
+"""
+    return stats
+
+if __name__ == '__main__':
+    app.run(debug=True, port=7860)