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package middleware
import (
"net/http"
"strings"
)
var xForwardedFor = http.CanonicalHeaderKey("X-Forwarded-For")
var xRealIP = http.CanonicalHeaderKey("X-Real-IP")
// RealIP is a middleware that sets a http.Request's RemoteAddr to the results
// of parsing either the X-Forwarded-For header or the X-Real-IP header (in that
// order).
//
// This middleware should be inserted fairly early in the middleware stack to
// ensure that subsequent layers (e.g., request loggers) which examine the
// RemoteAddr will see the intended value.
//
// You should only use this middleware if you can trust the headers passed to
// you (in particular, the two headers this middleware uses), for example
// because you have placed a reverse proxy like HAProxy or nginx in front of
// Goji. If your reverse proxies are configured to pass along arbitrary header
// values from the client, or if you use this middleware without a reverse
// proxy, malicious clients will be able to make you very sad (or, depending on
// how you're using RemoteAddr, vulnerable to an attack of some sort).
func RealIP(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
if rip := realIP(r); rip != "" {
r.RemoteAddr = rip
}
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func realIP(r *http.Request) string {
var ip string
if xff := r.Header.Get(xForwardedFor); xff != "" {
i := strings.Index(xff, ", ")
if i == -1 {
i = len(xff)
}
ip = xff[:i]
} else if xrip := r.Header.Get(xRealIP); xrip != "" {
ip = xrip
}
return ip
}
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