common/middlewares.py

import os
import json
import bittensor as bt
from aiohttp.web import Request, Response, middleware

EXPECTED_ACCESS_KEY = os.environ.get("EXPECTED_ACCESS_KEY")


@middleware
async def api_key_middleware(request: Request, handler):
    if request.path.startswith("/docs") or request.path.startswith("/static/swagger"):
        # Skip checks when accessing OpenAPI documentation.
        return await handler(request)

    # Logging the request
    bt.logging.info(f"Handling {request.method} request to {request.path}")

    # Check access key
    access_key = request.headers.get("api_key")
    if EXPECTED_ACCESS_KEY is not None and access_key != EXPECTED_ACCESS_KEY:
        bt.logging.error(f"Invalid access key: {access_key}")
        return Response(status=401, reason="Invalid access key")

    # Continue to the next handler if the API key is valid
    return await handler(request)


@middleware
async def json_parsing_middleware(request: Request, handler):
    if request.path.startswith("/docs") or request.path.startswith("/static/swagger"):
        # Skip checks when accessing OpenAPI documentation.
        return await handler(request)

    try:
        # Parsing JSON data from the request
        request["data"] = await request.json()
    except json.JSONDecodeError as e:
        bt.logging.error(f"Invalid JSON data: {str(e)}")
        return Response(status=400, text="Invalid JSON")

    # Continue to the next handler if JSON is successfully parsed
    return await handler(request)