87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
package middleware
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import (
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"net/http"
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"github.com/gin-gonic/gin"
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)
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// GinCORSWhitelist Gin CORS白名单配置
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type GinCORSWhitelist struct {
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AllowOrigin string
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AllowHeaders string
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AllowMethods string
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ExposeHeaders string
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AllowCredentials bool
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}
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// GinCORSConfig Gin CORS配置
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type GinCORSConfig struct {
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// Mode 模式: allow-all, whitelist, strict-whitelist
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Mode string
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Whitelist []GinCORSWhitelist
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}
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// 全局CORS配置
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var ginCorsConfig *GinCORSConfig
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// SetGinCORSConfig 设置Gin CORS配置
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func SetGinCORSConfig(cfg *GinCORSConfig) {
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ginCorsConfig = cfg
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}
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// CorsByRules 按照配置处理跨域请求（与 kra 保持一致）
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func CorsByRules() gin.HandlerFunc {
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// 放行全部
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if ginCorsConfig == nil || ginCorsConfig.Mode == "allow-all" {
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return Cors()
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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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whitelist := checkGinCors(origin)
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// 通过检查, 添加请求头
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if whitelist != nil {
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c.Header("Access-Control-Allow-Origin", whitelist.AllowOrigin)
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c.Header("Access-Control-Allow-Headers", whitelist.AllowHeaders)
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c.Header("Access-Control-Allow-Methods", whitelist.AllowMethods)
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c.Header("Access-Control-Expose-Headers", whitelist.ExposeHeaders)
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if whitelist.AllowCredentials {
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c.Header("Access-Control-Allow-Credentials", "true")
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}
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}
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// 严格白名单模式且未通过检查，直接拒绝处理请求
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if whitelist == nil && ginCorsConfig.Mode == "strict-whitelist" {
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// 健康检查放行
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if !(c.Request.Method == "GET" && c.Request.URL.Path == "/health") {
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c.AbortWithStatus(http.StatusForbidden)
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return
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}
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} else {
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// 非严格白名单模式，无论是否通过检查均放行所有 OPTIONS 方法
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if c.Request.Method == http.MethodOptions {
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c.AbortWithStatus(http.StatusNoContent)
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return
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}
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}
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// 处理请求
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c.Next()
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}
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}
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func checkGinCors(currentOrigin string) *GinCORSWhitelist {
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if ginCorsConfig == nil {
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return nil
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}
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for _, whitelist := range ginCorsConfig.Whitelist {
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// 遍历配置中的跨域头，寻找匹配项
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if currentOrigin == whitelist.AllowOrigin {
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return &whitelist
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}
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}
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return nil
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}
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