179 lines
6.4 KiB
Python
179 lines
6.4 KiB
Python
"""认证与权限模块（云端架构，首版）。
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认证方式：首版只用 API key + 哈希。
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- 创建用户时用 ``secrets.token_urlsafe(32)`` 生成明文 key，仅返回给调用方一次；
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库里只存 ``hashlib.sha256(api_key_plain.encode()).hexdigest()``，绝不存明文。
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- 认证时对输入做同样的 sha256 再查库比对。
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OAuth（GitHub/Google）是下一步接线：本模块不提供任何 OAuth 流程、
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不编造假 OAuth 端点或假 token 校验，接线时再由控制面按真实
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OAuth 协议接入，本模块的 API key 认证保持独立可用。
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权限模型：项目内角色 viewer < contributor < maintainer < owner。
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动作最低角色：read -> viewer，create_task -> contributor，
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approve_merge -> maintainer，manage_project -> owner（仅 owner）。
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未加入项目一律无权限。
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审计：audit() 只追加，list_audit() 只读；本模块不提供删除或修改
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审计记录的方法。
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零第三方依赖，只用 Python 标准库。
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"""
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import hashlib
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import secrets
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import sqlite3
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import time
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import uuid
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ROLES = ["viewer", "contributor", "maintainer", "owner"]
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_ROLE_LEVEL = {role: i for i, role in enumerate(ROLES)}
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_ACTION_MIN_ROLE = {
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"read": "viewer",
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"create_task": "contributor",
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"approve_merge": "maintainer",
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"manage_project": "owner",
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}
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class AuthStore:
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"""基于 SQLite 的用户 / 项目成员 / 审计存储。"""
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def __init__(self, db_path):
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self.db_path = str(db_path)
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self.conn = sqlite3.connect(self.db_path)
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self.conn.execute(
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"CREATE TABLE IF NOT EXISTS users("
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"id TEXT PRIMARY KEY, "
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"username TEXT UNIQUE, "
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"api_key_hash TEXT, "
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"created_at REAL)"
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)
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self.conn.execute(
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"CREATE TABLE IF NOT EXISTS project_members("
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"project_id TEXT, "
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"user_id TEXT, "
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"role TEXT, "
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"PRIMARY KEY(project_id, user_id))"
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)
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self.conn.execute(
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"CREATE TABLE IF NOT EXISTS audit_log("
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"id INTEGER PRIMARY KEY AUTOINCREMENT, "
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"user_id TEXT, "
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"project_id TEXT, "
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"action TEXT, "
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"detail TEXT, "
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"created_at REAL)"
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)
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self.conn.commit()
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def create_user(self, username):
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"""创建用户，返回 (user_id, api_key_plain)，明文仅返回这一次。"""
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user_id = uuid.uuid4().hex
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api_key_plain = secrets.token_urlsafe(32)
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api_key_hash = hashlib.sha256(api_key_plain.encode()).hexdigest()
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self.conn.execute(
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"INSERT INTO users(id, username, api_key_hash, created_at)"
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" VALUES(?, ?, ?, ?)",
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(user_id, username, api_key_hash, time.time()),
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)
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self.conn.commit()
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return user_id, api_key_plain
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def authenticate(self, api_key):
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"""用 API key 认证，成功返回 user_id，失败返回 None。"""
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if not api_key:
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return None
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api_key_hash = hashlib.sha256(api_key.encode()).hexdigest()
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row = self.conn.execute(
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"SELECT id FROM users WHERE api_key_hash = ?", (api_key_hash,)
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).fetchone()
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return row[0] if row else None
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def create_project(self, project_id, owner_user_id):
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"""创建项目成员记录：指定用户为该项目的 owner。"""
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self.conn.execute(
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"INSERT OR REPLACE INTO project_members(project_id, user_id, role)"
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" VALUES(?, ?, 'owner')",
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(project_id, owner_user_id),
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)
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self.conn.commit()
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def _member_role(self, project_id, user_id):
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row = self.conn.execute(
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"SELECT role FROM project_members"
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" WHERE project_id = ? AND user_id = ?",
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(project_id, user_id),
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).fetchone()
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return row[0] if row else None
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def set_member(self, project_id, actor_user_id, target_user_id, role):
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"""改成员角色：只有 owner 能改，否则 raise PermissionError；同时记审计。"""
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if role not in ROLES:
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raise ValueError("unknown role: %r" % (role,))
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if self._member_role(project_id, actor_user_id) != "owner":
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raise PermissionError(
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"only project owner can change members"
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)
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self.conn.execute(
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"INSERT OR REPLACE INTO project_members(project_id, user_id, role)"
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" VALUES(?, ?, ?)",
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(project_id, target_user_id, role),
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)
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self.conn.commit()
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self.audit(
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actor_user_id,
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project_id,
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"set_member",
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"%s:%s" % (target_user_id, role),
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)
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def check_permission(self, user_id, project_id, action):
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"""检查权限：满足最低角色返回 True，否则 False（含未加入项目）。"""
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min_role = _ACTION_MIN_ROLE.get(action)
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if min_role is None:
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return False
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role = self._member_role(project_id, user_id)
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if role is None:
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return False
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return _ROLE_LEVEL[role] >= _ROLE_LEVEL[min_role]
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def require_permission(self, user_id, project_id, action):
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"""不满足权限时 raise PermissionError。"""
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if not self.check_permission(user_id, project_id, action):
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raise PermissionError(
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"user %s lacks %s on project %s" % (user_id, action, project_id)
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)
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def audit(self, user_id, project_id, action, detail=""):
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"""只追加一条审计记录。"""
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self.conn.execute(
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"INSERT INTO audit_log(user_id, project_id, action, detail, created_at)"
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" VALUES(?, ?, ?, ?, ?)",
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(user_id, project_id, action, detail, time.time()),
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)
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self.conn.commit()
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def list_audit(self, project_id, limit=100):
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"""按 created_at 倒序返回该项目的审计列表（dict）。"""
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rows = self.conn.execute(
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"SELECT id, user_id, project_id, action, detail, created_at"
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" FROM audit_log WHERE project_id = ?"
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" ORDER BY created_at DESC, id DESC LIMIT ?",
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(project_id, limit),
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).fetchall()
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return [
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{
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"id": row[0],
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"user_id": row[1],
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"project_id": row[2],
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"action": row[3],
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"detail": row[4],
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"created_at": row[5],
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}
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for row in rows
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]
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