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rewrite.go
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rewrite.go
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package forward
import (
"net"
"net/http"
"strings"
"github.com/vulcand/oxy/utils"
)
// Rewriter 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} infromation 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]
}
func (rw *HeaderRewriter) Rewrite(req *http.Request) {
if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
clientIP = ipv6fix(clientIP)
if rw.TrustForwardHeader {
if prior, ok := req.Header[XForwardedFor]; ok {
clientIP = strings.Join(prior, ", ") + ", " + clientIP
}
}
req.Header.Set(XForwardedFor, clientIP)
}
if xfp := req.Header.Get(XForwardedProto); xfp != "" && rw.TrustForwardHeader {
req.Header.Set(XForwardedProto, xfp)
} else if req.TLS != nil {
req.Header.Set(XForwardedProto, "https")
} else {
req.Header.Set(XForwardedProto, "http")
}
if IsWebsocketRequest(req) {
if req.Header.Get(XForwardedProto) == "https" {
req.Header.Set(XForwardedProto, "wss")
} else {
req.Header.Set(XForwardedProto, "ws")
}
}
if xfh := req.Header.Get(XForwardedHost); xfh != "" && rw.TrustForwardHeader {
req.Header.Set(XForwardedHost, xfh)
} else if req.Host != "" {
req.Header.Set(XForwardedHost, req.Host)
}
if rw.Hostname != "" {
req.Header.Set(XForwardedServer, rw.Hostname)
}
if !IsWebsocketRequest(req) {
// Remove hop-by-hop headers to the backend. Especially important is "Connection" because we want a persistent
// connection, regardless of what the client sent to us.
utils.RemoveHeaders(req.Header, HopHeaders...)
}
}