Fixed #36940 -- Fixed script name edge case in ASGIRequest.path_info.

Paths that happened to begin with the script name were inappropriately
stripped, instead of checking that script name preceded a slash.

Author: KhadyotTakale

django/core/handlers/asgi.py

@@ -54,10 +54,13 @@ def __init__(self, scope, body_file):
         self.path = scope["path"]
         self.script_name = get_script_prefix(scope)
         if self.script_name:
-            # TODO: Better is-prefix checking, slash handling?
-            self.path_info = scope["path"].removeprefix(self.script_name)
+            script_name = self.script_name.rstrip("/")
+            if self.path.startswith(script_name + "/") or self.path == script_name:
+                self.path_info = self.path[len(script_name) :]
+            else:
+                self.path_info = self.path
         else:
-            self.path_info = scope["path"]
+            self.path_info = self.path
         # HTTP basics.
         self.method = self.scope["method"].upper()
         # Ensure query string is encoded correctly.

tests/handlers/tests.py

@@ -346,6 +346,26 @@ def test_force_script_name(self):
         self.assertEqual(request.script_name, "/FORCED_PREFIX")
         self.assertEqual(request.path_info, "/somepath/")
 
+    def test_root_path_prefix_boundary(self):
+        async_request_factory = AsyncRequestFactory()
+        # When path shares a textual prefix with root_path but not at a
+        # segment boundary, path_info should be the full path.
+        request = async_request_factory.request(
+            **{"path": "/rootprefix/somepath/", "root_path": "/root"}
+        )
+        self.assertEqual(request.path, "/rootprefix/somepath/")
+        self.assertEqual(request.script_name, "/root")
+        self.assertEqual(request.path_info, "/rootprefix/somepath/")
+
+    def test_root_path_trailing_slash(self):
+        async_request_factory = AsyncRequestFactory()
+        request = async_request_factory.request(
+            **{"path": "/root/somepath/", "root_path": "/root/"}
+        )
+        self.assertEqual(request.path, "/root/somepath/")
+        self.assertEqual(request.script_name, "/root/")
+        self.assertEqual(request.path_info, "/somepath/")
+
     async def test_sync_streaming(self):
         response = await self.async_client.get("/streaming/")
         self.assertEqual(response.status_code, 200)