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package main
import (
"fmt"
"io"
"net"
"net/http"
"os"
"strings"
)
// UnauthorizedIfNotLocal is a middleware that returns unauthorized if not
// being accessed from loopback, as a basic form of host authentication.
func UnauthorizedIfNotLocal(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !isLocal(r.RemoteAddr) {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
Logger.Printf("Unauthorized request from: %s for %s",
r.RemoteAddr, r.RequestURI)
return
}
h.ServeHTTP(w, r)
})
}
var isLocalCIDR = "127.0.0.1/8"
func isLocal(addr string) bool {
if strings.Contains(isLocalCIDR, ",") {
for _, cidr := range strings.Split(isLocalCIDR, ",") {
_, localNet, err := net.ParseCIDR(cidr)
if err != nil {
panic(err)
}
if localNet.Contains(net.ParseIP(strings.Split(addr, ":")[0])) {
return true
}
}
return false
} else {
_, localNet, err := net.ParseCIDR(isLocalCIDR)
if err != nil {
panic(err)
}
return localNet.Contains(net.ParseIP(strings.Split(addr, ":")[0]))
}
}
var shareLink = ""
func getShareLink() string {
if shareLink != "" {
return shareLink
}
return fmt.Sprintf("http://%s:%s/", GetHostIP(), getPort())
}
// GetHostIP attempts to guess the IP address of the current machine and
// returns that. Simply bails at the first non sane looking IP and returns it.
// Not ideal but it should work well enough most of the time
func GetHostIP() string {
iFaces, err := net.Interfaces()
if err != nil {
return "127.0.0.1"
}
// RFC 3927
_, ipv4LinkLocal, _ := net.ParseCIDR("169.254.0.0/16")
for _, iFace := range iFaces {
addrs, err := iFace.Addrs()
if err != nil {
continue
}
for _, a := range addrs {
n, ok := a.(*net.IPNet)
if !ok {
continue
}
if n.IP.To4() != nil && !n.IP.IsLoopback() && !ipv4LinkLocal.Contains(n.IP.To4()) {
return n.IP.String()
}
}
}
return "127.0.0.1"
}
func getPort() string {
s := strings.Split(Listen, ":")
if len(s) != 2 {
return Listen
}
return s[1]
}
// ServeSelf tries to locate the currently running executable and serve
// it down to the client.
func ServeSelf(w http.ResponseWriter, r *http.Request) {
s, err := os.Executable()
if err != nil {
Logger.Println("While trying to get my executable path: ", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
fh, err := os.Open(s)
if err != nil {
Logger.Println("While opening my own executable for reading: ", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
_, err = io.Copy(w, fh)
fh.Close()
return
}
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