89 lines
3.2 KiB
Python
89 lines
3.2 KiB
Python
import requests
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from django.core.cache import cache
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from django.core.signing import TimestampSigner, BadSignature, SignatureExpired
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from .models import WeChatPayConfig, WeChatUser
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import logging
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logger = logging.getLogger(__name__)
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def get_current_wechat_user(request):
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"""
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根据 Authorization 头获取当前微信用户
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增强逻辑：如果 Token 解析出的 OpenID 对应的用户不存在（可能已被合并删除），
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但该 OpenID 是 Web 虚拟 ID (web_phone)，尝试通过手机号查找现有的主账号。
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"""
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auth_header = request.headers.get('Authorization')
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if not auth_header or not auth_header.startswith('Bearer '):
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return None
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token = auth_header.split(' ')[1]
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signer = TimestampSigner()
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try:
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# 签名包含 openid
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openid = signer.unsign(token, max_age=86400 * 30) # 30天有效
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user = WeChatUser.objects.filter(openid=openid).first()
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if user:
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return user
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# 如果没找到用户，检查是否是 Web 虚拟 OpenID
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# 场景：Web 用户已被合并到小程序账号，旧 Web Token 依然有效，指向合并后的账号
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if openid.startswith('web_'):
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try:
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# 格式: web_13800138000
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parts = openid.split('_', 1)
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if len(parts) == 2:
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phone = parts[1]
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# 尝试通过手机号查找（查找合并后的主账号）
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user = WeChatUser.objects.filter(phone_number=phone).first()
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if user:
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return user
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except Exception:
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pass
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return None
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except (BadSignature, SignatureExpired):
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return None
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def get_access_token(config=None, force_refresh=False):
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"""
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获取微信接口调用凭证 (client_credential)
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"""
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# 尝试从缓存获取
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cache_key = 'wechat_access_token'
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if config:
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cache_key = f'wechat_access_token_{config.app_id}'
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if not force_refresh:
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token = cache.get(cache_key)
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if token:
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return token
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if not config:
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# 优先查找指定 AppID
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config = WeChatPayConfig.objects.filter(app_id='wxdf2ca73e6c0929f0').first()
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if not config:
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config = WeChatPayConfig.objects.filter(is_active=True).first()
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if not config or not config.app_id or not config.app_secret:
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logger.error("No active WeChatPayConfig found or missing app_id/app_secret")
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return None
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url = f"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={config.app_id}&secret={config.app_secret}"
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try:
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response = requests.get(url, timeout=10)
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data = response.json()
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if 'access_token' in data:
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token = data['access_token']
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expires_in = data.get('expires_in', 7200)
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# 缓存 Token，留出 200 秒缓冲时间
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cache.set(cache_key, token, expires_in - 200)
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return token
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else:
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logger.error(f"获取 AccessToken 失败: {data}")
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except Exception as e:
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logger.error(f"获取 AccessToken 异常: {str(e)}", exc_info=True)
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return None
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