Refactor codebase to by DRY

ops_bot/gitlab/hook.py

@@ -1,12 +1,15 @@
 import logging
 import re
-from typing import Any, List, Tuple
+from typing import Any, List, Optional, Tuple
 
 import attr
+from fastapi import Request
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBasicCredentials
 from jinja2 import TemplateNotFound
 from mautrix.types import Format, MessageType, TextMessageEventContent
 from mautrix.util.formatter import parse_html
 
+from ..config import RoutingKey
 from ..util.template import TemplateManager, TemplateUtil
 from .types import OTHER_ENUMS, Action, EventParse  # type: ignore
 
@@ -18,7 +21,17 @@ messages = TemplateManager("gitlab", "messages")
 templates = TemplateManager("gitlab", "mixins")
 
 
-async def parse_event(x_gitlab_event: str, payload: Any) -> List[Tuple[str, str]]:
+async def authorize(
+    route: RoutingKey,
+    request: Request,
+    basic_credentials: Optional[HTTPBasicCredentials],
+    bearer_credentials: Optional[HTTPAuthorizationCredentials],
+) -> bool:
+    provided: Optional[str] = request.headers.get("x-gitlab-token")
+    return provided == route.secret_token
+
+
+async def handle_event(x_gitlab_event: str, payload: Any) -> List[Tuple[str, str]]:
     evt = EventParse[x_gitlab_event].deserialize(payload)
     try:
         tpl = messages[evt.template_name]
@@ -68,3 +81,10 @@ async def parse_event(x_gitlab_event: str, payload: Any) -> List[Tuple[str, str]
         }
         msgs.append((content.body, content.formatted_body))
     return msgs
+
+
+async def parse_event(
+    route: RoutingKey, payload: Any, request: Request
+) -> List[Tuple[str, str]]:
+    x_gitlab_event = request.headers.get("x-gitlab-event")
+    return await handle_event(x_gitlab_event, payload)