Synced licenses with github repo (#1246)

* Added script to download licenses from github

* Synced licenses with github repo

scripts/generate-licenses.go

@@ -0,0 +1,109 @@
+// +build !build
+
+package main
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	prefix      = "gitea-licenses"
+	url         = "https://api.github.com/repos/spdx/license-list/tarball"
+	destination = ""
+)
+
+func init() {
+	flag.StringVar(&destination, "dest", "options/license/", "destination for the licenses")
+}
+
+func main() {
+	flag.Parse()
+
+	file, err := ioutil.TempFile(os.TempDir(), prefix)
+
+	if err != nil {
+		log.Fatalf("Failed to create temp file. %s", err)
+	}
+
+	defer os.Remove(file.Name())
+
+	resp, err := http.Get(url)
+
+	if err != nil {
+		log.Fatalf("Failed to download archive. %s", err)
+	}
+
+	defer resp.Body.Close()
+
+	if _, err := io.Copy(file, resp.Body); err != nil {
+		log.Fatalf("Failed to copy archive to file. %s", err)
+	}
+
+	if _, err := file.Seek(0, 0); err != nil {
+		log.Fatalf("Failed to reset seek on archive. %s", err)
+	}
+
+	gz, err := gzip.NewReader(file)
+
+	if err != nil {
+		log.Fatalf("Failed to gunzip the archive. %s", err)
+	}
+
+	tr := tar.NewReader(gz)
+
+	for {
+		hdr, err := tr.Next()
+
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			log.Fatalf("Failed to iterate archive. %s", err)
+		}
+
+		fmt.Println(hdr.Name)
+		fmt.Println(filepath.Ext(hdr.Name))
+
+		if filepath.Ext(hdr.Name) != ".txt" {
+			continue
+		}
+
+		if strings.HasPrefix(filepath.Base(hdr.Name), "README") {
+			continue
+		}
+
+		if strings.HasPrefix(filepath.Base(hdr.Name), "deprecated_") {
+			continue
+		}
+
+		fmt.Println(path.Join(destination, strings.TrimSuffix(filepath.Base(hdr.Name), ".txt")))
+
+		out, err := os.Create(path.Join(destination, strings.TrimSuffix(filepath.Base(hdr.Name), ".txt")))
+
+		if err != nil {
+			log.Fatalf("Failed to create new file. %s", err)
+		}
+
+		defer out.Close()
+
+		if _, err := io.Copy(out, tr); err != nil {
+			log.Fatalf("Failed to write new file. %s", err)
+		} else {
+			fmt.Printf("Written %s\n", out.Name())
+		}
+	}
+
+	fmt.Println("Done")
+}