fix(hub): SSO in hub_sso without Flask for FastAPI hub

hub_sso.py

@@ -0,0 +1,107 @@
+"""
+实例浏览器 SSO（复用 HUB_BRIDGE_TOKEN）。无 Flask 依赖，供中控 FastAPI 与各实例共用。
+"""
+from __future__ import annotations
+
+import base64
+import hashlib
+import hmac
+import json
+import os
+import secrets
+import threading
+import time
+
+HUB_SSO_TTL_SEC = int(os.getenv("HUB_SSO_TTL_SEC", "7200"))
+
+_used_nonces: dict[str, float] = {}
+_nonce_lock = threading.Lock()
+
+
+def hub_bridge_token() -> str:
+    return (os.getenv("HUB_BRIDGE_TOKEN") or "").strip()
+
+
+def safe_next_path(raw: str | None) -> str:
+    p = (raw or "/").strip()
+    if not p.startswith("/") or p.startswith("//"):
+        return "/"
+    if "://" in p:
+        return "/"
+    return p
+
+
+def _sso_secret() -> str:
+    return hub_bridge_token()
+
+
+def _b64url_encode(data: bytes) -> str:
+    return base64.urlsafe_b64encode(data).decode().rstrip("=")
+
+
+def _b64url_decode(data: str) -> bytes:
+    pad = "=" * (-len(data) % 4)
+    return base64.urlsafe_b64decode(data + pad)
+
+
+def _prune_used_nonces() -> None:
+    now = time.time()
+    with _nonce_lock:
+        dead = [k for k, exp in _used_nonces.items() if exp <= now]
+        for k in dead:
+            del _used_nonces[k]
+
+
+def mint_hub_sso_token(exchange_key: str, next_path: str = "/") -> str | None:
+    secret = _sso_secret()
+    ex = (exchange_key or "").strip().lower()
+    if not secret or not ex:
+        return None
+    payload = {
+        "ex": ex,
+        "exp": int(time.time()) + max(60, HUB_SSO_TTL_SEC),
+        "nonce": secrets.token_urlsafe(16),
+        "next": safe_next_path(next_path),
+    }
+    body = _b64url_encode(json.dumps(payload, separators=(",", ":")).encode())
+    sig = hmac.new(secret.encode(), body.encode(), hashlib.sha256).hexdigest()
+    return f"{body}.{sig}"
+
+
+def verify_hub_sso_token(
+    token: str | None, expected_exchange: str
+) -> tuple[bool, str, str | None]:
+    secret = _sso_secret()
+    expected = (expected_exchange or "").strip().lower()
+    if not secret or not expected:
+        return False, "/", "未配置 HUB_BRIDGE_TOKEN"
+    raw = (token or "").strip()
+    if "." not in raw:
+        return False, "/", "token 无效"
+    body, sig = raw.rsplit(".", 1)
+    try:
+        expect_sig = hmac.new(secret.encode(), body.encode(), hashlib.sha256).hexdigest()
+        if not hmac.compare_digest(expect_sig, sig):
+            return False, "/", "签名校验失败"
+        payload = json.loads(_b64url_decode(body).decode())
+    except Exception:
+        return False, "/", "token 解析失败"
+    if not isinstance(payload, dict):
+        return False, "/", "payload 无效"
+    if str(payload.get("ex") or "").lower() != expected:
+        return False, "/", "实例不匹配"
+    try:
+        exp = int(payload.get("exp") or 0)
+    except (TypeError, ValueError):
+        return False, "/", "exp 无效"
+    if exp < int(time.time()):
+        return False, "/", "链接已过期"
+    nonce = str(payload.get("nonce") or "")
+    if not nonce:
+        return False, "/", "nonce 缺失"
+    _prune_used_nonces()
+    with _nonce_lock:
+        if nonce in _used_nonces:
+            return False, "/", "链接已使用"
+        _used_nonces[nonce] = float(exp)
+    return True, safe_next_path(str(payload.get("next") or "/")), None