go test pls

main.go

@@ -1,12 +1,18 @@
 package main
 
 import (
+	"encoding/binary"
+	"encoding/csv"
 	"flag"
+	"local1/logger"
 	"log"
+	"net"
 	"net/http"
 	"os"
 	"path"
 	"path/filepath"
+	"sort"
+	"strconv"
 	"strings"
 
 	"google.golang.org/appengine"
@@ -22,7 +28,14 @@ func main() {
 	directory := flag.String("d", path.Join(exePath, "public"), "the directory of static file to host")
 	flag.Parse()
 
+	getIPs()
+
 	http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		remoteIP := strings.Split(r.RemoteAddr, ":")[0]
+		if notUSA(remoteIP) {
+			logger.Log(remoteIP, "NOT USA")
+			return
+		}
 		if r.URL.Scheme == "http" || strings.HasPrefix(r.Host, "http:") {
 			r.URL.Scheme = "https"
 			http.Redirect(w, r, r.URL.String(), http.StatusTemporaryRedirect)
@@ -35,3 +48,87 @@ func main() {
 
 	appengine.Main()
 }
+
+var globalIPs []uint64
+
+func getIPs() []uint64 {
+	if globalIPs != nil {
+		return globalIPs
+	}
+
+	globalIPs = make([]uint64, 0)
+
+	f, err := os.Open("private/ipv4.csv")
+	if err != nil {
+		panic(err)
+	}
+	ipv4r := csv.NewReader(f)
+	ipv4all, err := ipv4r.ReadAll()
+	if err != nil {
+		panic(err)
+	}
+	logger.Log("IPV4s")
+	for i := range ipv4all {
+		if ipv4all[i][2] == "US" || ipv4all[i][2] == "-" {
+			start, err := strconv.ParseUint(ipv4all[i][0], 10, 64)
+			if err != nil {
+				panic(err)
+			}
+			stop, err := strconv.ParseUint(ipv4all[i][1], 10, 64)
+			if err != nil {
+				panic(err)
+			}
+			globalIPs = append(globalIPs, uint64(start), uint64(stop))
+		}
+	}
+
+	g, err := os.Open("private/ipv6.csv")
+	if err != nil {
+		panic(err)
+	}
+
+	ipv6r := csv.NewReader(g)
+	ipv6all, err := ipv6r.ReadAll()
+	if err != nil {
+		panic(err)
+	}
+	logger.Log("IPV6s")
+	for i := range ipv6all {
+		if ipv6all[i][2] == "US" {
+			start, err := strconv.ParseUint(ipv6all[i][0], 10, 64)
+			if err != nil {
+				continue
+			}
+			stop, err := strconv.ParseUint(ipv6all[i][1], 10, 64)
+			if err != nil {
+				continue
+			}
+			globalIPs = append(globalIPs, uint64(start), uint64(stop))
+		}
+	}
+	sort.Slice(globalIPs, func(i, j int) bool {
+		return globalIPs[i] > globalIPs[j]
+	})
+	return globalIPs
+}
+
+func notUSA(ip string) bool {
+	dec := toDec(ip)
+	ips := getIPs()
+	n := sort.Search(len(ips), func(i int) bool {
+		return ips[i] > dec
+	})
+	logger.Log(ip, dec, ips[0], n, len(ips))
+	return n%2 == 1
+}
+
+func toDec(ips string) uint64 {
+	ip := net.ParseIP(ips)
+	if ip == nil {
+		return uint64(0)
+	}
+	if len(ip) == 16 {
+		return uint64(binary.BigEndian.Uint32(ip[12:16]))
+	}
+	return uint64(binary.BigEndian.Uint32(ip))
+}