51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
package middleware
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import (
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"strings"
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"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
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"github.com/gin-gonic/gin"
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)
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// CORS 跨域中间件。
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// 允许来源通过 Server.Domain 配置（如 test.com），自动放行其 http/https 两种协议的 Origin。
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// 未配置时回退为 *（保持兼容）。
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func CORS() gin.HandlerFunc {
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domain := ""
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if global.ServerSetting != nil {
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domain = strings.TrimSpace(global.ServerSetting.Domain)
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}
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return func(c *gin.Context) {
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origin := c.GetHeader("Origin")
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allowOrigin := "*"
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if domain != "" && domain != "*" {
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allowOrigin = ""
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if originAllowed(origin, domain) {
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allowOrigin = origin
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}
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}
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if allowOrigin != "" {
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c.Header("Access-Control-Allow-Origin", allowOrigin)
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}
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c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
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c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Authorization")
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c.Header("Access-Control-Expose-Headers", "Content-Length")
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c.Header("Access-Control-Max-Age", "86400")
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if c.Request.Method == "OPTIONS" {
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c.AbortWithStatus(204)
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return
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}
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c.Next()
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}
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}
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// originAllowed 判断 Origin 是否命中配置域名（http/https，忽略尾部斜杠）。
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func originAllowed(origin, domain string) bool {
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o := strings.TrimSuffix(strings.TrimSpace(origin), "/")
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return o == "https://"+domain || o == "http://"+domain
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}
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