implemented "SUPPORT_MALFORMED_JSON" variable

app/main.py

@@ -96,6 +96,11 @@ app.add_middleware(
     allow_methods=['*'],
     allow_headers=['*'],
 )
+if bool(env('SUPPORT_MALFORMED_JSON', False)):
+    from middleware import PatchMalformedJsonMiddleware
+
+    logger.info(f'Enabled "PatchMalformedJsonMiddleware"!')
+    app.add_middleware(PatchMalformedJsonMiddleware, enabled=True)
 
 
 # Helper

app/middleware.py

@@ -0,0 +1,40 @@
+import json
+import logging
+import re
+
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+
+logger = logging.getLogger(__name__)
+
+
+class PatchMalformedJsonMiddleware(BaseHTTPMiddleware):
+    # see oscar.krause/fastapi-dls#1
+
+    def __init__(self, app, enabled: bool):
+        super().__init__(app)
+        self.enabled = enabled
+
+    async def dispatch(self, request: Request, call_next):
+        body = await request.body()
+        content_type = request.headers.get('Content-Type')
+
+        if self.enabled and content_type == 'application/json':
+            body = body.decode()
+            try:
+                json.loads(body)
+            except json.decoder.JSONDecodeError:
+                logger.warning(f'Malformed json received! Try to fix it, "PatchMalformedJsonMiddleware" is enabled.')
+                body = body.replace('\t', '')
+                body = body.replace('\n', '')
+
+                regex = '(\"mac_address_list\"\:\s?\[)([\w\d])'
+                s = re.sub(regex, r'\1"\2', body)
+                logger.debug(f'Fixed JSON: "{s}"')
+                s = json.loads(s)  # ensure json is now valid
+
+                # set new body
+                request._body = json.dumps(s).encode('utf-8')
+
+        response = await call_next(request)
+        return response