feat: Waku v2 bridge

Issue #12610

vendor/github.com/anacrolix/missinggo/httptoo/request.go

@@ -0,0 +1,23 @@
+package httptoo
+
+import (
+	"net"
+	"net/http"
+
+	"github.com/anacrolix/missinggo"
+)
+
+// Request is intended for localhost, either with a localhost name, or
+// loopback IP.
+func RequestIsForLocalhost(r *http.Request) bool {
+	hostHost := missinggo.SplitHostMaybePort(r.Host).Host
+	if ip := net.ParseIP(hostHost); ip != nil {
+		return ip.IsLoopback()
+	}
+	return hostHost == "localhost"
+}
+
+// Request originated from a loopback IP.
+func RequestIsFromLocalhost(r *http.Request) bool {
+	return net.ParseIP(missinggo.SplitHostMaybePort(r.RemoteAddr).Host).IsLoopback()
+}