fix: Gitea webhook adapter — normalize events to sensory bus (#309)

Co-authored-by: Kimi Agent <kimi@timmy.local>
Co-committed-by: Kimi Agent <kimi@timmy.local>

src/timmy/adapters/__init__.py

@@ -0,0 +1 @@
+"""Adapters — normalize external data streams into sensory events."""

src/timmy/adapters/gitea_adapter.py

@@ -0,0 +1,136 @@
+"""Gitea webhook adapter — normalize webhook payloads to event bus events.
+
+Receives raw Gitea webhook payloads and emits typed events via the
+infrastructure event bus.  Bot-only activity is filtered unless it
+represents a PR merge (which is always noteworthy).
+"""
+
+import logging
+from typing import Any
+
+from infrastructure.events.bus import emit
+
+logger = logging.getLogger(__name__)
+
+# Gitea usernames considered "bot" accounts
+BOT_USERNAMES = frozenset({"hermes", "kimi", "manus"})
+
+# Owner username — activity from this user is always emitted
+OWNER_USERNAME = "rockachopa"
+
+# Mapping from Gitea webhook event type to our bus event type
+_EVENT_TYPE_MAP = {
+    "push": "gitea.push",
+    "issues": "gitea.issue.opened",
+    "issue_comment": "gitea.issue.comment",
+    "pull_request": "gitea.pull_request",
+}
+
+
+def _extract_actor(payload: dict[str, Any]) -> str:
+    """Extract the actor username from a webhook payload."""
+    # Gitea puts actor in sender.login for most events
+    sender = payload.get("sender", {})
+    return sender.get("login", "unknown")
+
+
+def _is_bot(username: str) -> bool:
+    return username.lower() in BOT_USERNAMES
+
+
+def _is_pr_merge(event_type: str, payload: dict[str, Any]) -> bool:
+    """Check if this is a pull_request merge event."""
+    if event_type != "pull_request":
+        return False
+    action = payload.get("action", "")
+    pr = payload.get("pull_request", {})
+    return action == "closed" and pr.get("merged", False)
+
+
+def _normalize_push(payload: dict[str, Any], actor: str) -> dict[str, Any]:
+    """Normalize a push event payload."""
+    commits = payload.get("commits", [])
+    return {
+        "actor": actor,
+        "ref": payload.get("ref", ""),
+        "repo": payload.get("repository", {}).get("full_name", ""),
+        "num_commits": len(commits),
+        "head_message": commits[0].get("message", "").split("\n", 1)[0].strip() if commits else "",
+    }
+
+
+def _normalize_issue_opened(payload: dict[str, Any], actor: str) -> dict[str, Any]:
+    """Normalize an issue-opened event payload."""
+    issue = payload.get("issue", {})
+    return {
+        "actor": actor,
+        "action": payload.get("action", "opened"),
+        "repo": payload.get("repository", {}).get("full_name", ""),
+        "issue_number": issue.get("number", 0),
+        "title": issue.get("title", ""),
+    }
+
+
+def _normalize_issue_comment(payload: dict[str, Any], actor: str) -> dict[str, Any]:
+    """Normalize an issue-comment event payload."""
+    issue = payload.get("issue", {})
+    comment = payload.get("comment", {})
+    return {
+        "actor": actor,
+        "action": payload.get("action", "created"),
+        "repo": payload.get("repository", {}).get("full_name", ""),
+        "issue_number": issue.get("number", 0),
+        "issue_title": issue.get("title", ""),
+        "comment_body": (comment.get("body", "")[:200]),
+    }
+
+
+def _normalize_pull_request(payload: dict[str, Any], actor: str) -> dict[str, Any]:
+    """Normalize a pull-request event payload."""
+    pr = payload.get("pull_request", {})
+    return {
+        "actor": actor,
+        "action": payload.get("action", ""),
+        "repo": payload.get("repository", {}).get("full_name", ""),
+        "pr_number": pr.get("number", 0),
+        "title": pr.get("title", ""),
+        "merged": pr.get("merged", False),
+    }
+
+
+_NORMALIZERS = {
+    "push": _normalize_push,
+    "issues": _normalize_issue_opened,
+    "issue_comment": _normalize_issue_comment,
+    "pull_request": _normalize_pull_request,
+}
+
+
+async def handle_webhook(event_type: str, payload: dict[str, Any]) -> bool:
+    """Normalize a Gitea webhook payload and emit it to the event bus.
+
+    Args:
+        event_type: The Gitea event type header (e.g. "push", "issues").
+        payload: The raw JSON payload from the webhook.
+
+    Returns:
+        True if an event was emitted, False if filtered or unsupported.
+    """
+    bus_event_type = _EVENT_TYPE_MAP.get(event_type)
+    if bus_event_type is None:
+        logger.debug("Unsupported Gitea event type: %s", event_type)
+        return False
+
+    actor = _extract_actor(payload)
+
+    # Filter bot-only activity — except PR merges
+    if _is_bot(actor) and not _is_pr_merge(event_type, payload):
+        logger.debug("Filtered bot activity from %s on %s", actor, event_type)
+        return False
+
+    normalizer = _NORMALIZERS[event_type]
+    data = normalizer(payload, actor)
+
+    await emit(bus_event_type, source="gitea", data=data)
+    logger.info("Emitted %s from %s", bus_event_type, actor)
+    return True