53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package forwardedheaders
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import (
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"net/http"
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"github.com/containous/traefik/ip"
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"github.com/vulcand/oxy/forward"
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"github.com/vulcand/oxy/utils"
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)
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// XForwarded filter for XForwarded headers
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type XForwarded struct {
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insecure bool
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trustedIps []string
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ipChecker *ip.Checker
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}
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// NewXforwarded creates a new XForwarded
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func NewXforwarded(insecure bool, trustedIps []string) (*XForwarded, error) {
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var ipChecker *ip.Checker
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if len(trustedIps) > 0 {
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var err error
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ipChecker, err = ip.NewChecker(trustedIps)
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if err != nil {
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return nil, err
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}
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}
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return &XForwarded{
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insecure: insecure,
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trustedIps: trustedIps,
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ipChecker: ipChecker,
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}, nil
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}
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func (x *XForwarded) isTrustedIP(ip string) bool {
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if x.ipChecker == nil {
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return false
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}
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return x.ipChecker.IsAuthorized(ip) == nil
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}
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func (x *XForwarded) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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if !x.insecure && !x.isTrustedIP(r.RemoteAddr) {
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utils.RemoveHeaders(r.Header, forward.XHeaders...)
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}
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// If there is a next, call it.
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if next != nil {
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next(w, r)
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}
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}
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