56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
package middleware
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import (
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"net"
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"net/http"
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"net/url"
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"strings"
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"github.com/gin-gonic/gin"
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)
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func CORS() gin.HandlerFunc {
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return func(c *gin.Context) {
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origin := strings.TrimSpace(c.GetHeader("Origin"))
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if origin != "" {
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if isLoopbackOrigin(origin) {
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c.Header("Access-Control-Allow-Origin", origin)
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c.Header("Vary", "Origin")
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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, Accept, Authorization")
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c.Header("Access-Control-Expose-Headers", "Content-Length, Content-Disposition")
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c.Header("Access-Control-Max-Age", "86400")
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} else if c.Request.Method == http.MethodOptions {
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c.AbortWithStatus(http.StatusForbidden)
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return
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}
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}
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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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c.Next()
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}
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}
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func isLoopbackOrigin(origin string) bool {
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u, err := url.Parse(origin)
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if err != nil {
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return false
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}
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if u.Scheme != "http" && u.Scheme != "https" {
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return false
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}
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host := strings.TrimSpace(u.Hostname())
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if host == "" {
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return false
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}
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if strings.EqualFold(host, "localhost") {
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return true
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}
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ip := net.ParseIP(host)
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return ip != nil && ip.IsLoopback()
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}
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