/
validate_origin.go
73 lines (59 loc) · 1.34 KB
/
validate_origin.go
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package api
import (
"net/url"
"github.com/Ptt-official-app/go-openbbsmiddleware/types"
"github.com/gin-gonic/gin"
)
// isValidOriginReferer
//
// origin: have origin when CORS or POST.
// referer: <a href> or ajax.
//
// need to check origin and referer when they are not empty strings.
// origin as white-list, referer as black-list for now.
func isValidOriginReferer(c *gin.Context) bool {
origin := c.GetHeader("Origin")
if origin == "" {
origin = c.GetHeader("origin")
}
referer := c.GetHeader("Referer")
if referer == "" {
referer = c.GetHeader("referer")
}
if origin != "" && !isValidOrigin(origin) {
return false
}
if referer != "" && !isValidReferer(referer) {
return false
}
return true
}
func isValidOrigin(origin string) bool {
if len(types.ALLOW_ORIGINS) == 0 {
return true
}
hostname := getHostnameFromURL(origin)
isValid, ok := types.ALLOW_ORIGINS_MAP[hostname]
if !ok || !isValid {
return false
}
return true
}
func isValidReferer(referer string) bool {
if len(types.BLOCKED_REFERERS) == 0 {
return true
}
hostname := getHostnameFromURL(referer)
isBlocked, ok := types.BLOCKED_REFERERS_MAP[hostname]
if !ok || isBlocked {
return false
}
return true
}
func getHostnameFromURL(referer string) (hostname string) {
u, err := url.Parse(referer)
if err != nil {
return referer
}
return u.Host
}