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package forward
import (
"net"
"net/http"
"os"
"strings"
"github.com/vulcand/oxy/v2/utils"
)
// NewHeaderRewriter creates a new HeaderRewriter middleware.
func NewHeaderRewriter() *HeaderRewriter {
h, err := os.Hostname()
if err != nil {
h = "localhost"
}
return &HeaderRewriter{TrustForwardHeader: true, Hostname: h}
}
// HeaderRewriter is responsible for removing hop-by-hop headers and setting forwarding headers.
type HeaderRewriter struct {
TrustForwardHeader bool
Hostname string
}
// clean up IP in case if it is ipv6 address and it has {zone} information in it, like "[fe80::d806:a55d:eb1b:49cc%vEthernet (vmxnet3 Ethernet Adapter - Virtual Switch)]:64692".
func ipv6fix(clientIP string) string {
return strings.Split(clientIP, "%")[0]
}
// Rewrite request headers.
func (rw *HeaderRewriter) Rewrite(req *http.Request) {
if !rw.TrustForwardHeader {
utils.RemoveHeaders(req.Header, XHeaders...)
}
if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
clientIP = ipv6fix(clientIP)
if req.Header.Get(XRealIP) == "" {
req.Header.Set(XRealIP, clientIP)
}
}
xfProto := req.Header.Get(XForwardedProto)
if xfProto == "" {
if req.TLS != nil {
req.Header.Set(XForwardedProto, "https")
} else {
req.Header.Set(XForwardedProto, "http")
}
}
if xfPort := req.Header.Get(XForwardedPort); xfPort == "" {
req.Header.Set(XForwardedPort, forwardedPort(req))
}
if xfHost := req.Header.Get(XForwardedHost); xfHost == "" && req.Host != "" {
req.Header.Set(XForwardedHost, req.Host)
}
if rw.Hostname != "" {
req.Header.Set(XForwardedServer, rw.Hostname)
}
}
func forwardedPort(req *http.Request) string {
if req == nil {
return ""
}
if _, port, err := net.SplitHostPort(req.Host); err == nil && port != "" {
return port
}
if req.Header.Get(XForwardedProto) == "https" || req.Header.Get(XForwardedProto) == "wss" {
return "443"
}
if req.TLS != nil {
return "443"
}
return "80"
}
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