forum

backend/shop/utils.py

@@ -0,0 +1,43 @@
+import requests
+from django.core.cache import cache
+from .models import WeChatPayConfig
+
+def get_access_token(config=None):
+    """
+    获取微信接口调用凭证 (client_credential)
+    """
+    # 尝试从缓存获取
+    cache_key = 'wechat_access_token'
+    if config:
+        cache_key = f'wechat_access_token_{config.app_id}'
+        
+    token = cache.get(cache_key)
+    if token:
+        return token
+
+    if not config:
+        # 优先查找指定 AppID
+        config = WeChatPayConfig.objects.filter(app_id='wxdf2ca73e6c0929f0').first()
+        if not config:
+            config = WeChatPayConfig.objects.filter(is_active=True).first()
+            
+    if not config or not config.app_id or not config.app_secret:
+        return None
+
+    url = f"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={config.app_id}&secret={config.app_secret}"
+    try:
+        response = requests.get(url, timeout=10)
+        data = response.json()
+
+        if 'access_token' in data:
+            token = data['access_token']
+            expires_in = data.get('expires_in', 7200)
+            # 缓存 Token，留出 200 秒缓冲时间
+            cache.set(cache_key, token, expires_in - 200)
+            return token
+        else:
+            print(f"获取 AccessToken 失败: {data}")
+    except Exception as e:
+        print(f"获取 AccessToken 异常: {str(e)}")
+    
+    return None