fix: 加密中间件对GET请求空body返回400的问题

backend/internal/middleware/crypto.go

@@ -46,33 +46,36 @@ func (cm *CryptoMiddleware) ProcessRequest() gin.HandlerFunc {
 				return
 			}
 
-			var req interface{}
-			if err := json.Unmarshal(body, &req); err != nil {
-				c.JSON(400, gin.H{"code": 400, "message": "解析请求体失败"})
-				c.Abort()
-				return
-			}
+			// 空请求体（如 GET 请求），跳过解析，直接放行
+			if len(body) > 0 {
+				var req interface{}
+				if err := json.Unmarshal(body, &req); err != nil {
+					c.JSON(400, gin.H{"code": 400, "message": "解析请求体失败"})
+					c.Abort()
+					return
+				}
 
-			reqMap, ok := req.(map[string]interface{})
-			if ok {
-				if encryptedData, exists := reqMap["data"]; exists {
-					if dataStr, ok := encryptedData.(string); ok {
-						decrypted, err := cm.cryptoManager.Decrypt(dataStr)
-						if err != nil {
-							c.JSON(400, gin.H{"code": 400, "message": "解密失败: " + err.Error()})
-							c.Abort()
-							return
+				reqMap, ok := req.(map[string]interface{})
+				if ok {
+					if encryptedData, exists := reqMap["data"]; exists {
+						if dataStr, ok := encryptedData.(string); ok {
+							decrypted, err := cm.cryptoManager.Decrypt(dataStr)
+							if err != nil {
+								c.JSON(400, gin.H{"code": 400, "message": "解密失败: " + err.Error()})
+								c.Abort()
+								return
+							}
+
+							var decryptedData interface{}
+							if err := json.Unmarshal([]byte(decrypted), &decryptedData); err != nil {
+								c.JSON(400, gin.H{"code": 400, "message": "解析解密数据失败"})
+								c.Abort()
+								return
+							}
+
+							c.Set("decrypted_data", decryptedData)
+							c.Set("is_encrypted", true)
 						}
-
-						var decryptedData interface{}
-						if err := json.Unmarshal([]byte(decrypted), &decryptedData); err != nil {
-							c.JSON(400, gin.H{"code": 400, "message": "解析解密数据失败"})
-							c.Abort()
-							return
-						}
-
-						c.Set("decrypted_data", decryptedData)
-						c.Set("is_encrypted", true)
 					}
 				}
 			}