1 files changed, 122 insertions, 0 deletions
diff --git a/build/generate-licenses.go b/build/generate-licenses.go
new file mode 100644
index 0000000..9a111bc
--- /dev/null
+++ b/build/generate-licenses.go
@@ -0,0 +1,122 @@
+//go:build ignore
+
+package main
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"code.gitea.io/gitea/modules/util"
+)
+
+func main() {
+	var (
+		prefix         = "gitea-licenses"
+		url            = "https://api.github.com/repos/spdx/license-list-data/tarball"
+		githubApiToken = ""
+		githubUsername = ""
+		destination    = ""
+	)
+
+	flag.StringVar(&destination, "dest", "options/license/", "destination for the licenses")
+	flag.StringVar(&githubUsername, "username", "", "github username")
+	flag.StringVar(&githubApiToken, "token", "", "github api token")
+	flag.Parse()
+
+	file, err := os.CreateTemp(os.TempDir(), prefix)
+	if err != nil {
+		log.Fatalf("Failed to create temp file. %s", err)
+	}
+
+	defer util.Remove(file.Name())
+
+	if err := os.RemoveAll(destination); err != nil {
+		log.Fatalf("Cannot clean destination folder: %v", err)
+	}
+
+	if err := os.MkdirAll(destination, 0o755); err != nil {
+		log.Fatalf("Cannot create destination: %v", err)
+	}
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		log.Fatalf("Failed to download archive. %s", err)
+	}
+
+	if len(githubApiToken) > 0 && len(githubUsername) > 0 {
+		req.SetBasicAuth(githubUsername, githubApiToken)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	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)
+		}
+
+		if !strings.Contains(hdr.Name, "/text/") {
+			continue
+		}
+
+		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
+		}
+		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")
+}