Revert "refactor: clean up legacy code, rename hopper to entity_extractor, and add third-party notices"

This reverts commit 54fcef9887.

Please do not submit unrelated docs and codes in the same commit. I am reverting this commit so that the related files can be submitted in better-organized future commits.

artemis/utils/requests_utils.py

@@ -0,0 +1,51 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from artemis.utils.logger import get_logger
+import requests
+
+logger = get_logger(__name__)
+
+
+def curl_from_request(req: requests.PreparedRequest) -> str:
+    """Converts a requests.PreparedRequest object to a valid cURL command string."""
+    command = ["curl", f"-X {req.method}"]
+
+    for key, value in req.headers.items():
+        command.append(f'-H "{key}: {value}"')
+
+    if req.body:
+        body = req.body
+        if isinstance(body, bytes):
+            body = body.decode("utf-8")
+        # Escape single quotes in the body for shell safety
+        body = body.replace("'", "'\\''")
+        command.append(f"-d '{body}'")
+
+    command.append(f"'{req.url}'")
+
+    return " ".join(command)
+
+
+def logging_hook(response, *args, **kwargs):
+    """Hook to log the request as a cURL command."""
+    curl_command = curl_from_request(response.request)
+    logger.debug(f"\n--- cURL Command ---\n{curl_command}\n--------------------")
+
+
+def get_session_with_curl_logging() -> requests.Session:
+    """Returns a requests.Session with cURL logging enabled."""
+    session = requests.Session()
+    session.hooks["response"] = [logging_hook]
+    return session