74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package forward
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import (
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"net"
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"net/http"
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"strings"
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"github.com/vulcand/oxy/utils"
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)
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// Rewriter is responsible for removing hop-by-hop headers and setting forwarding headers
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type HeaderRewriter struct {
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TrustForwardHeader bool
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Hostname string
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}
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func (rw *HeaderRewriter) Rewrite(req *http.Request) {
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if !rw.TrustForwardHeader {
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utils.RemoveHeaders(req.Header, XHeaders...)
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}
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if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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if prior, ok := req.Header[XForwardedFor]; ok {
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req.Header.Set(XForwardedFor, strings.Join(prior, ", ")+", "+clientIP)
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} else {
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req.Header.Set(XForwardedFor, clientIP)
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}
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if req.Header.Get(XRealIp) == "" {
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req.Header.Set(XRealIp, clientIP)
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}
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}
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xfProto := req.Header.Get(XForwardedProto)
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if xfProto == "" {
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if req.TLS != nil {
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req.Header.Set(XForwardedProto, "https")
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} else {
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req.Header.Set(XForwardedProto, "http")
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}
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}
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if xfp := req.Header.Get(XForwardedPort); xfp == "" {
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req.Header.Set(XForwardedPort, forwardedPort(req))
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}
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if xfHost := req.Header.Get(XForwardedHost); xfHost == "" && req.Host != "" {
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req.Header.Set(XForwardedHost, req.Host)
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}
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if rw.Hostname != "" {
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req.Header.Set(XForwardedServer, rw.Hostname)
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}
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// Remove hop-by-hop headers to the backend. Especially important is "Connection" because we want a persistent
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// connection, regardless of what the client sent to us.
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utils.RemoveHeaders(req.Header, HopHeaders...)
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}
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func forwardedPort(req *http.Request) string {
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if req == nil {
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return ""
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}
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if _, port, err := net.SplitHostPort(req.Host); err == nil && port != "" {
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return port
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}
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if req.TLS != nil {
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return "443"
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}
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return "80"
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}
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