241 lines
8.3 KiB
Python
241 lines
8.3 KiB
Python
"""外部集成 webhook 与推送通知模块（云端架构实施）。
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零第三方依赖，只用 Python 标准库。
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本模块只做两件事：
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1. 入站 webhook 的签名校验与事件解析（GitHub、Slack）。
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2. 出站状态通知的占位分发（webhook + Slack）。
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边界（不要超出本模块宣称的范围）：
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- Web Push / APNs / FCM 明确是后续需要证书的一步，本版只有
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webhook + Slack 占位，不要编造已接通手机推送。
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- 密钥走环境变量是调用方的事：本模块的校验函数只接受参数，
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不自己读生产密钥，也不把任何密钥写入文件。
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- 本模块不联网、不调用真实 GitHub/Slack、不跑真实模型回合。
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"""
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import hashlib
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import hmac
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import sqlite3
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import time
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from cloud.db import connect as _db_connect
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__all__ = [
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"verify_github_signature",
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"parse_github_pr_comment",
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"verify_slack_signature",
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"parse_slack_command",
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"SlackUserMap",
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"ALLOWED_NOTIFICATION_EVENTS",
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"NotificationService",
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]
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def verify_github_signature(secret, payload_bytes, signature_header):
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"""校验 GitHub webhook 签名。
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signature_header 形如 ``"sha256=<hex>"``，用
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``hmac.new(secret.encode(), payload_bytes, hashlib.sha256).hexdigest()``
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比对，比较用 ``hmac.compare_digest``。缺 secret 或缺 header 返回 False。
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"""
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if not secret or not signature_header:
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return False
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if isinstance(payload_bytes, str):
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payload_bytes = payload_bytes.encode("utf-8")
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if not isinstance(payload_bytes, (bytes, bytearray)):
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return False
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if not isinstance(signature_header, str):
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return False
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try:
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expected = "sha256=" + hmac.new(
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secret.encode("utf-8"), bytes(payload_bytes), hashlib.sha256
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).hexdigest()
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except (AttributeError, TypeError, ValueError):
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return False
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return hmac.compare_digest(expected, signature_header)
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def parse_github_pr_comment(payload):
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"""解析 GitHub issue_comment 事件，返回 fix-review 触发点或 None。
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这是 PR 评论 → fix-review 的触发点，真正执行 fix-review 由控制面调
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host.py 完成，本函数只解析不执行。
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只有当 action == "created" 且 comment body 里含 "/fix-review" 时返回::
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{"type": "fix_review", "repo": ..., "pr_number": ...,
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"comment": ..., "author": ...}
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其中 repo 取 payload repository full_name，pr_number 取 issue number，
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comment 取 body，author 取 comment user login。其他情况返回 None。
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"""
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if not isinstance(payload, dict):
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return None
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if payload.get("action") != "created":
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return None
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comment = payload.get("comment")
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if not isinstance(comment, dict):
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return None
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body = comment.get("body")
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if not isinstance(body, str) or "/fix-review" not in body:
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return None
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repository = payload.get("repository") or {}
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issue = payload.get("issue") or {}
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user = comment.get("user") or {}
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return {
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"type": "fix_review",
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"repo": repository.get("full_name"),
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"pr_number": issue.get("number"),
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"comment": body,
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"author": user.get("login"),
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}
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def verify_slack_signature(signing_secret, timestamp, body, signature_header):
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"""校验 Slack 请求签名（防重放）。
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Slack 规则：basestring = ``f"v0:{timestamp}:{body}"``，hmac sha256，
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header 形如 ``"v0=<hex>"``。时间戳与当前时间差超过 300 秒返回 False
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（防重放）；缺参返回 False。
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"""
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if not signing_secret or timestamp is None or body is None:
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return False
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if not signature_header:
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return False
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try:
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ts_int = int(timestamp)
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except (TypeError, ValueError):
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return False
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if abs(time.time() - ts_int) > 300:
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return False
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try:
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if isinstance(body, (bytes, bytearray)):
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basestring = b"v0:" + str(ts_int).encode("utf-8") + b":" + bytes(body)
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expected = "v0=" + hmac.new(
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signing_secret.encode("utf-8"), basestring, hashlib.sha256
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).hexdigest()
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else:
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basestring = f"v0:{timestamp}:{body}"
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expected = "v0=" + hmac.new(
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signing_secret.encode("utf-8"),
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basestring.encode("utf-8"),
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hashlib.sha256,
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).hexdigest()
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except (AttributeError, TypeError, ValueError):
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return False
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if not isinstance(signature_header, str):
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return False
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return hmac.compare_digest(expected, signature_header)
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def parse_slack_command(text):
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"""解析 Slack 斜杠命令。
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- ``"/codex 做一个加法函数"`` ->
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``{"command": "codex", "prompt": "做一个加法函数"}``
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- ``"/codex status <任务名>"`` ->
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``{"command": "status", "task": "<任务名>"}``
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- 空或非 ``/codex`` 开头 -> ``{"command": None, "prompt": text}``
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"""
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if not text or not isinstance(text, str):
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return {"command": None, "prompt": text}
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stripped = text.strip()
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if stripped == "/codex" or stripped.startswith("/codex "):
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rest = stripped[len("/codex"):].strip()
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if rest == "status" or rest.startswith("status "):
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task = rest[len("status"):].strip()
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return {"command": "status", "task": task}
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return {"command": "codex", "prompt": rest}
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return {"command": None, "prompt": text}
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class SlackUserMap:
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"""Slack 用户 ID 到内部 user_id 的映射（SQLite）。"""
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def __init__(self, db_path):
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self.db_path = db_path
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self._conn = _db_connect(db_path)
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self._conn.execute(
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"CREATE TABLE IF NOT EXISTS slack_users ("
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"slack_id TEXT PRIMARY KEY, "
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"user_id TEXT, "
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"created_at REAL)"
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)
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self._conn.commit()
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def map(self, slack_id, user_id):
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"""把 slack_id 映射到 user_id（已存在则覆盖）。"""
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self._conn.execute(
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"INSERT OR REPLACE INTO slack_users "
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"(slack_id, user_id, created_at) VALUES (?, ?, ?)",
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(slack_id, user_id, time.time()),
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)
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self._conn.commit()
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def lookup(self, slack_id):
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"""返回 slack_id 对应的 user_id，未映射返回 None。"""
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row = self._conn.execute(
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"SELECT user_id FROM slack_users WHERE slack_id = ?",
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(slack_id,),
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).fetchone()
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return row[0] if row else None
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def close(self):
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"""关闭数据库连接（可选，单测/退出时用）。"""
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self._conn.close()
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# 只发状态变化的事件集合：进行中的状态（如 running）不触发通知。
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ALLOWED_NOTIFICATION_EVENTS = {
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"completed",
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"failed",
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"goal-unmet",
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"merge-failed",
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"review-requested",
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}
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class NotificationService:
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"""状态通知分发（webhook + Slack 占位）。
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Web Push / APNs / FCM 明确是后续需要证书的一步，本版只有 webhook +
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Slack 占位，不要编造已接通手机推送。
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sender 都是可调用对象，单测可注入假 sender，默认 None 时不发、
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不报错。sender 被调用时收到一个 dict payload::
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{"event_type": ..., "task_id": ..., "project_id": ..., "detail": ...}
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"""
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def __init__(self, webhook_sender=None, slack_sender=None):
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self.webhook_sender = webhook_sender
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self.slack_sender = slack_sender
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def notify(self, event_type, task_id, project_id, detail=""):
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"""发送一条状态通知。
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event_type 不在 ALLOWED_NOTIFICATION_EVENTS 里时返回
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``{"sent": False, "reason": "event not allowed"}`` 且不调用 sender；
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否则依次调 webhook_sender 和 slack_sender（不为 None 的才调），
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返回 ``{"sent": True, "channels": [...已调的通道名...]}``。
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"""
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if event_type not in ALLOWED_NOTIFICATION_EVENTS:
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return {"sent": False, "reason": "event not allowed"}
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payload = {
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"event_type": event_type,
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"task_id": task_id,
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"project_id": project_id,
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"detail": detail,
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}
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channels = []
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if self.webhook_sender is not None:
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self.webhook_sender(payload)
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channels.append("webhook")
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if self.slack_sender is not None:
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self.slack_sender(payload)
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channels.append("slack")
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return {"sent": True, "channels": channels}
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