47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
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package middleware
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import (
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"log"
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"strings"
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"github.com/gin-gonic/gin"
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)
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// CORS CORS中间件
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func CORS() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 获取请求路径
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path := c.Request.URL.Path
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c.Header("Access-Control-Allow-Origin", "*")
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c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
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// 添加 WebSocket 升级所需的头
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c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Accept, Authorization, Connection, Upgrade, Sec-WebSocket-Key, Sec-WebSocket-Version, Sec-WebSocket-Protocol, Sec-WebSocket-Extensions")
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c.Header("Access-Control-Expose-Headers", "Content-Length, Connection, Upgrade")
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c.Header("Access-Control-Allow-Credentials", "true")
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// 处理 WebSocket 升级请求的预检
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if c.Request.Method == "OPTIONS" {
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log.Printf("[CORS] OPTIONS 预检请求: %s", path)
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c.AbortWithStatus(204)
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return
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}
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// 针对 WebSocket 路径的特殊处理
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if path == "/ws" {
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connection := c.GetHeader("Connection")
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upgrade := c.GetHeader("Upgrade")
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log.Printf("[CORS] WebSocket 请求: Connection=%s, Upgrade=%s", connection, upgrade)
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// 检查是否是有效的 WebSocket 升级请求
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if strings.Contains(strings.ToLower(connection), "upgrade") && strings.ToLower(upgrade) == "websocket" {
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log.Printf("[CORS] 有效的 WebSocket 升级请求")
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} else {
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log.Printf("[CORS] 警告: 不是有效的 WebSocket 升级请求!")
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}
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}
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c.Next()
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}
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}
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