feat: complete Gitea webhook event parsing and task dispatch

- Add parse_gitea_event() function to parse issue comments, labels, and PR review requests
- Detect @agent mentions in issue comments and strip them from message
- Implement rate limiting with slowapi (10 requests/minute)
- Integrate with PersistentTaskQueue and MessageStore
- Queue messages if task is already running for the same thread
- Add 6 comprehensive tests for event parsing and signature verification

agent/webapp.py

@@ -1,13 +1,23 @@
 """galaxis-agent webhook server."""
 import hashlib
 import hmac
+import json
 import logging
+import os
+import re
 
 from fastapi import FastAPI, Request, HTTPException
+from slowapi import Limiter
+from slowapi.util import get_remote_address
+from slowapi.errors import RateLimitExceeded
+from slowapi.middleware import SlowAPIMiddleware
 
 logger = logging.getLogger(__name__)
 
 app = FastAPI(title="galaxis-agent")
+limiter = Limiter(key_func=get_remote_address)
+app.state.limiter = limiter
+app.add_middleware(SlowAPIMiddleware)
 
 
 def verify_gitea_signature(payload: bytes, signature: str, secret: str) -> bool:
@@ -22,21 +32,114 @@ def generate_thread_id(repo: str, issue_id: int) -> str:
     return f"{raw[:8]}-{raw[8:12]}-{raw[12:16]}-{raw[16:20]}-{raw[20:32]}"
 
 
+def parse_gitea_event(event_type: str, payload: dict) -> dict:
+    """Gitea webhook 페이로드를 파싱하여 처리 대상인지 판단한다."""
+    repo = payload.get("repository", {})
+    repo_name = repo.get("name", "")
+    full_name = repo.get("full_name", "")
+    repo_owner = full_name.split("/")[0] if "/" in full_name else ""
+
+    base = {
+        "should_process": False,
+        "issue_number": 0,
+        "repo_name": repo_name,
+        "repo_owner": repo_owner,
+        "message": "",
+        "event_type": event_type,
+        "title": "",
+    }
+
+    if event_type == "issue_comment":
+        action = payload.get("action", "")
+        if action != "created":
+            return base
+        comment_body = payload.get("comment", {}).get("body", "")
+        issue = payload.get("issue", {})
+        if "@agent" not in comment_body.lower():
+            return base
+        message = re.sub(r"@agent\b", "", comment_body, flags=re.IGNORECASE).strip()
+        base.update({
+            "should_process": True,
+            "issue_number": issue.get("number", 0),
+            "message": message,
+            "title": issue.get("title", ""),
+        })
+        return base
+
+    if event_type == "issues":
+        label = payload.get("label", {})
+        if label.get("name") == "agent-fix":
+            issue = payload.get("issue", {})
+            base.update({
+                "should_process": True,
+                "issue_number": issue.get("number", 0),
+                "message": issue.get("body", ""),
+                "title": issue.get("title", ""),
+            })
+        return base
+
+    if event_type == "pull_request":
+        action = payload.get("action", "")
+        if action == "review_requested":
+            pr = payload.get("pull_request", {})
+            base.update({
+                "should_process": True,
+                "issue_number": pr.get("number", 0),
+                "message": pr.get("body", ""),
+                "title": pr.get("title", ""),
+            })
+        return base
+
+    return base
+
+
 @app.get("/health")
 async def health():
     return {"status": "ok"}
 
 
 @app.post("/webhooks/gitea")
+@limiter.limit("10/minute")
 async def gitea_webhook(request: Request):
-    """Gitea webhook endpoint. Full implementation in Phase 3."""
-    import os
-    body = await request.body()
+    """Gitea webhook endpoint with event parsing and task dispatch."""
+    payload_bytes = await request.body()
     signature = request.headers.get("X-Gitea-Signature", "")
     secret = os.environ.get("GITEA_WEBHOOK_SECRET", "")
 
-    if not verify_gitea_signature(body, signature, secret):
+    if not verify_gitea_signature(payload_bytes, signature, secret):
         raise HTTPException(status_code=401, detail="Invalid signature")
 
-    logger.info("Gitea webhook received (not yet implemented)")
-    return {"status": "received"}
+    payload = json.loads(payload_bytes)
+    event_type = request.headers.get("X-Gitea-Event", "")
+
+    event = parse_gitea_event(event_type, payload)
+    if not event["should_process"]:
+        return {"status": "ignored"}
+
+    thread_id = generate_thread_id(event["repo_name"], event["issue_number"])
+
+    from agent.message_store import get_message_store
+    from agent.task_queue import get_task_queue
+    task_queue = await get_task_queue()
+
+    if await task_queue.has_running_task(thread_id):
+        store = await get_message_store()
+        await store.push_message(thread_id, {
+            "role": "human",
+            "content": event["message"],
+        })
+        return {"status": "queued_message", "thread_id": thread_id}
+
+    task_id = await task_queue.enqueue(
+        thread_id=thread_id,
+        source="gitea",
+        payload={
+            "issue_number": event["issue_number"],
+            "repo_owner": event["repo_owner"],
+            "repo_name": event["repo_name"],
+            "message": event["message"],
+            "title": event["title"],
+            "event_type": event["event_type"],
+        },
+    )
+    return {"status": "enqueued", "task_id": task_id, "thread_id": thread_id}

tests/test_gitea_webhook.py

@@ -0,0 +1,94 @@
+"""Tests for Gitea webhook event parsing and signature verification."""
+import hashlib
+import hmac
+
+
+def make_signature(payload: bytes, secret: str) -> str:
+    """Gitea HMAC-SHA256 서명을 생성한다."""
+    return hmac.new(secret.encode(), payload, hashlib.sha256).hexdigest()
+
+
+def test_verify_signature():
+    """Gitea webhook 서명을 검증한다."""
+    from agent.webapp import verify_gitea_signature
+
+    payload = b'{"action": "created"}'
+    secret = "test-secret"
+    sig = make_signature(payload, secret)
+    assert verify_gitea_signature(payload, sig, secret) is True
+    assert verify_gitea_signature(payload, "wrong", secret) is False
+
+
+def test_generate_thread_id():
+    """결정론적 스레드 ID를 생성한다."""
+    from agent.webapp import generate_thread_id
+
+    tid1 = generate_thread_id("galaxis-po", 42)
+    tid2 = generate_thread_id("galaxis-po", 42)
+    tid3 = generate_thread_id("galaxis-po", 43)
+    assert tid1 == tid2
+    assert tid1 != tid3
+    assert len(tid1) == 36
+    assert tid1.count("-") == 4
+
+
+def test_parse_issue_comment_with_mention():
+    """이슈 코멘트에서 @agent 멘션을 감지한다."""
+    from agent.webapp import parse_gitea_event
+
+    payload = {
+        "action": "created",
+        "comment": {"body": "@agent factor_calculator에 듀얼 모멘텀 추가해줘"},
+        "issue": {"number": 42, "title": "Feature request", "body": "description"},
+        "repository": {"full_name": "quant/galaxis-po", "name": "galaxis-po"},
+    }
+    result = parse_gitea_event("issue_comment", payload)
+    assert result is not None
+    assert result["should_process"] is True
+    assert result["issue_number"] == 42
+    assert result["repo_name"] == "galaxis-po"
+    assert "@agent" not in result["message"]
+
+
+def test_parse_issue_comment_without_mention():
+    """@agent 멘션이 없는 코멘트는 무시한다."""
+    from agent.webapp import parse_gitea_event
+
+    payload = {
+        "action": "created",
+        "comment": {"body": "일반 코멘트입니다"},
+        "issue": {"number": 42, "title": "Bug", "body": "desc"},
+        "repository": {"full_name": "quant/galaxis-po", "name": "galaxis-po"},
+    }
+    result = parse_gitea_event("issue_comment", payload)
+    assert result["should_process"] is False
+
+
+def test_parse_issue_label_agent_fix():
+    """agent-fix 라벨 부착 시 작업을 트리거한다."""
+    from agent.webapp import parse_gitea_event
+
+    payload = {
+        "action": "label_updated",
+        "issue": {"number": 10, "title": "Fix login", "body": "Login fails"},
+        "label": {"name": "agent-fix"},
+        "repository": {"full_name": "quant/galaxis-po", "name": "galaxis-po"},
+    }
+    result = parse_gitea_event("issues", payload)
+    assert result is not None
+    assert result["should_process"] is True
+
+
+def test_parse_pr_review_requested():
+    """PR 리뷰 요청을 감지한다."""
+    from agent.webapp import parse_gitea_event
+
+    payload = {
+        "action": "review_requested",
+        "pull_request": {"number": 5, "title": "feat: add feature", "body": "desc"},
+        "repository": {"full_name": "quant/galaxis-po", "name": "galaxis-po"},
+    }
+    result = parse_gitea_event("pull_request", payload)
+    assert result is not None
+    assert result["should_process"] is True
+    assert result["issue_number"] == 5