Update fileservice.py

adding fileservice.py
refer to https://huggingface.co./spaces/jonigata/PoseMaker2/blob/main/fileservice.py

fileservice.py

@@ -0,0 +1,37 @@
+from fastapi import FastAPI, Request, Response
+
+filenames = ["js/sketch.js"]
+contents = '\n'.join([f"<script type='text/javascript' src='{x}'></script>" for x in filenames])
+
+app = FastAPI()
+
+@app.middleware("http")
+async def insert_js(request: Request, call_next):
+    path = request.scope['path']  # get the request route
+    response = await call_next(request)
+    
+    if path == "/":
+        response_body = ""
+        async for chunk in response.body_iterator:
+            response_body += chunk.decode()
+
+        some_javascript = """
+        <script type="text/javascript">
+        src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.6.0/p5.js">
+        </script>
+         <script src="sketch.js"></script>
+        """
+        
+        response_body = response_body.replace("</headers>", some_javascript + "</headers>")
+        response_body = response_body.replace("</body>", contents + "</body>")
+
+        del response.headers["content-length"]
+
+        return Response(
+            content=response_body,
+            status_code=response.status_code, 
+            headers=dict(response.headers),
+            media_type=response.media_type
+        )
+
+    return response