middleware/cors.go

// Copyright (c) 2025-2026 libaxuan
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package middleware

import (
	"github.com/gin-gonic/gin"
)

// CORS 跨域中间件
func CORS() gin.HandlerFunc {
	return func(c *gin.Context) {
		// 设置CORS头
		c.Header("Access-Control-Allow-Origin", "*")
		c.Header("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE")
		c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
		c.Header("Access-Control-Allow-Credentials", "true")
		c.Header("Access-Control-Max-Age", "86400")

		// 处理预检请求
		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(200)
			return
		}

		c.Next()
	}
}