Migrate code from Go branch to new repo

web/helpers.go

@@ -0,0 +1,167 @@
+package web
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"math"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/librespeed/speedtest/config"
+	"github.com/librespeed/speedtest/results"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var (
+	// get server location from ipinfo.io from start to minimize API access
+	serverLat, serverLng = getServerLocation()
+	// for testing
+	// serverLat, serverLng = 22.7702, 112.9578
+	// serverLat, serverLng = 23.018, 113.7487
+)
+
+func getRandomData(length int) []byte {
+	data := make([]byte, length)
+	if _, err := rand.Read(data); err != nil {
+		log.Fatalf("Failed to generate random data: %s", err)
+	}
+	return data
+}
+
+func getIPInfoURL(address string) string {
+	apiKey := config.LoadedConfig().IPInfoAPIKey
+
+	ipInfoURL := `https://ipinfo.io/%s/json`
+	if address != "" {
+		ipInfoURL = fmt.Sprintf(ipInfoURL, address)
+	} else {
+		ipInfoURL = "https://ipinfo.io/json"
+	}
+
+	if apiKey != "" {
+		ipInfoURL += "?token=" + apiKey
+	}
+
+	return ipInfoURL
+}
+
+func getIPInfo(addr string) results.IPInfoResponse {
+	var ret results.IPInfoResponse
+	resp, err := http.DefaultClient.Get(getIPInfoURL(addr))
+	if err != nil {
+		log.Errorf("Error getting response from ipinfo.io: %s", err)
+		return ret
+	}
+
+	raw, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Errorf("Error reading response from ipinfo.io: %s", err)
+		return ret
+	}
+	defer resp.Body.Close()
+
+	if err := json.Unmarshal(raw, &ret); err != nil {
+		log.Errorf("Error parsing response from ipinfo.io: %s", err)
+	}
+
+	return ret
+}
+
+func getServerLocation() (float64, float64) {
+	conf := config.LoadedConfig()
+
+	if conf.ServerLat > 0 && conf.ServerLng > 0 {
+		log.Infof("Configured server coordinates: %.6f, %.6f", conf.ServerLat, conf.ServerLng)
+		return conf.ServerLat, conf.ServerLng
+	}
+
+	var ret results.IPInfoResponse
+	resp, err := http.DefaultClient.Get(getIPInfoURL(""))
+	if err != nil {
+		log.Errorf("Error getting repsonse from ipinfo.io: %s", err)
+		return 0, 0
+	}
+	raw, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Errorf("Error reading response from ipinfo.io: %s", err)
+		return 0, 0
+	}
+	defer resp.Body.Close()
+
+	if err := json.Unmarshal(raw, &ret); err != nil {
+		log.Errorf("Error parsing response from ipinfo.io: %s", err)
+		return 0, 0
+	}
+
+	var lat, lng float64
+	if ret.Location != "" {
+		lat, lng = parseLocationString(ret.Location)
+	}
+
+	log.Infof("Fetched server coordinates: %.6f, %.6f", lat, lng)
+
+	return lat, lng
+}
+
+func parseLocationString(location string) (float64, float64) {
+	parts := strings.Split(location, ",")
+	if len(parts) != 2 {
+		log.Errorf("Unknown location format: %s", location)
+		return 0, 0
+	}
+
+	lat, err := strconv.ParseFloat(parts[0], 64)
+	if err != nil {
+		log.Errorf("Error parsing latitude: %s", parts[0])
+		return 0, 0
+	}
+
+	lng, err := strconv.ParseFloat(parts[1], 64)
+	if err != nil {
+		log.Errorf("Error parsing longitude: %s", parts[0])
+		return 0, 0
+	}
+
+	return lat, lng
+}
+
+func calculateDistance(clientLocation string, unit string) string {
+	clientLat, clientLng := parseLocationString(clientLocation)
+
+	radlat1 := float64(math.Pi * serverLat / 180)
+	radlat2 := float64(math.Pi * clientLat / 180)
+
+	theta := float64(serverLng - clientLng)
+	radtheta := float64(math.Pi * theta / 180)
+
+	dist := math.Sin(radlat1)*math.Sin(radlat2) + math.Cos(radlat1)*math.Cos(radlat2)*math.Cos(radtheta)
+
+	if dist > 1 {
+		dist = 1
+	}
+
+	dist = math.Acos(dist)
+	dist = dist * 180 / math.Pi
+	dist = dist * 60 * 1.1515
+
+	unitString := " mi"
+	switch unit {
+	case "km":
+		dist = dist * 1.609344
+		unitString = " km"
+	case "NM":
+		dist = dist * 0.8684
+		unitString = " NM"
+	}
+
+	return fmt.Sprintf("%d%s", round(dist), unitString)
+}
+
+func round(v float64) int {
+	r := int(math.Round(v))
+	return 10 * ((r + 9) / 10)
+}