First commit

.gitignore

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+*.exe
+current.txt
+error.log
+ddragon-*.tgz
+data/

go.mod

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+module tilo-k/ddragon-cdn
+
+go 1.19
+
+require (
+	github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7 // indirect
+	github.com/otiai10/copy v1.9.0 // indirect
+	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+)

go.sum

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+github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7 h1:uSoVVbwJiQipAclBbw+8quDsfcvFjOpI5iCf4p/cqCs=
+github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
+github.com/otiai10/copy v1.9.0 h1:7KFNiCgZ91Ru4qW4CWPf/7jqtxLagGRmIxWldPP9VY4=
+github.com/otiai10/copy v1.9.0/go.mod h1:hsfX19wcn0UWIHUQ3/4fHuehhk2UyArQ9dVFAn3FczI=
+github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJG+0mI8eUu6xqkFDYS2kb2saOteoSB3cE=
+github.com/otiai10/curr v1.0.0/go.mod h1:LskTG5wDwr8Rs+nNQ+1LlxRjAtTZZjtJW4rMXl6j4vs=
+github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
+github.com/otiai10/mint v1.4.0/go.mod h1:gifjb2MYOoULtKLqUAEILUG/9KONW6f7YsJ6vQLTlFI=
+github.com/walle/targz v0.0.0-20140417120357-57fe4206da5a h1:6cKSHLRphD9Fo1LJlISiulvgYCIafJ3QfKLimPYcAGc=
+github.com/walle/targz v0.0.0-20140417120357-57fe4206da5a/go.mod h1:nccQrXCnc5SjsThFLmL7hYbtT/mHJcuolPifzY5vJqE=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/alcortesm/tgz"
+	"github.com/otiai10/copy"
+)
+
+func getVersions() []string {
+	url := "https://ddragon.leagueoflegends.com/api/versions.json"
+
+	res, err := http.Get(url)
+	checkError(err)
+	defer res.Body.Close()
+
+	body, err := ioutil.ReadAll(res.Body)
+	checkError(err)
+
+	versions := make([]string, 0)
+	json.Unmarshal(body, &versions)
+
+	return versions
+}
+
+func loadDdragon(version string) string {
+	url := fmt.Sprintf("https://ddragon.leagueoflegends.com/cdn/dragontail-%s.tgz", version)
+	filename := "ddragon-" + version + ".tgz"
+
+	if _, err := os.Stat(filename); os.IsNotExist(err) {
+		res, err := http.Get(url)
+		checkError(err)
+		defer res.Body.Close()
+
+		out, err := os.Create(filename)
+		checkError(err)
+		defer out.Close()
+
+		io.Copy(out, res.Body)
+	}
+
+	return filename
+}
+
+func getCurrentVersion() string {
+	_, err := os.Stat("current.txt")
+	if os.IsNotExist(err) {
+		return ""
+	}
+
+	_, err = os.Stat("data")
+	if os.IsNotExist(err) {
+		return ""
+	}
+
+	data, err := ioutil.ReadFile("current.txt")
+	checkError(err)
+
+	return string(data)
+}
+
+func loadCurrent() {
+	versions := getVersions()
+	if getCurrentVersion() != versions[0] {
+		file := loadDdragon(versions[0])
+		ioutil.WriteFile("current.txt", []byte(versions[0]), 0777)
+
+		path, err := tgz.Extract(file)
+		checkError(err)
+
+		_, err = os.Stat("data")
+		if !os.IsNotExist(err) {
+			err = os.Remove("data")
+		}
+		checkError(err)
+
+		dest, err := filepath.Abs("./data")
+		checkError(err)
+		err = os.Rename(path, dest)
+		if err != nil {
+			copy.Copy(path, dest)
+		}
+		os.RemoveAll(path)
+
+		src, _ := filepath.Abs(filepath.Join("data", versions[0]))
+		dst, _ := filepath.Abs(filepath.Join("data", "latest"))
+
+		err = os.Rename(src, dst)
+		checkError(err)
+	}
+}
+
+func main() {
+	loadCurrent()
+
+	go func() {
+		dur, err := time.ParseDuration("30m")
+		checkError(err)
+
+		for true {
+			time.Sleep(dur)
+			loadCurrent()
+		}
+	}()
+
+	fs := http.FileServer(http.Dir("./data"))
+	http.Handle("/", fs)
+
+	log.Print("Listening on :60002...")
+	err := http.ListenAndServe(":60002", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

util.go

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+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+func checkError(err error) {
+	if err == nil {
+		return
+	}
+
+	fmt.Println("[!] ", err)
+	f, _ := os.OpenFile("error.log", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
+	v, _ := time.Now().UTC().MarshalText()
+	f.WriteString(fmt.Sprintf("[%s] %s\n", string(v), err))
+}