Rewrite go license generator in go (#21078)

This removes the JS dependency in the checks pipeline. JSON output is
different because the previous JS did indent the license data
differently and a JSON key was changed, but the end result is the same
as it gets re-indented by wepack.

Co-authored-by: 6543 <[email protected]>
Co-authored-by: Lunny Xiao <[email protected]>
Co-authored-by: zeripath <[email protected]>

Author: 4 people

.drone.yml

@@ -90,10 +90,7 @@ steps:
   - name: checks-backend
     image: golang:1.19
     commands:
-      - curl -sL https://deb.nodesource.com/setup_18.x | bash - && apt-get -qqy install nodejs
       - make checks-backend
-    environment:
-      DEBIAN_FRONTEND: noninteractive
     depends_on: [deps-backend]
     volumes:
       - name: deps

Makefile

@@ -422,10 +422,10 @@ tidy-check: tidy
 .PHONY: go-licenses
 go-licenses: assets/go-licenses.json
 
-assets/go-licenses.json: go.mod go.sum build/generate-go-licenses.js
-	-$(GO) run $(GO_LICENSES_PACKAGE) save . --force --save_path="$(GO_LICENSE_TMP_DIR)" 2>/dev/null
-	node build/generate-go-licenses.js "$(GO_LICENSE_TMP_DIR)" "$(GO_LICENSE_FILE)"
-	@rm -rf "$(GO_LICENSE_TMP_DIR)"
+assets/go-licenses.json: go.mod go.sum
+	-$(GO) run $(GO_LICENSES_PACKAGE) save . --force --save_path=$(GO_LICENSE_TMP_DIR) 2>/dev/null
+	$(GO) run build/generate-go-licenses.go $(GO_LICENSE_TMP_DIR) $(GO_LICENSE_FILE)
+	@rm -rf $(GO_LICENSE_TMP_DIR)
 
 generate-ini-sqlite:
 	sed -e 's|{{REPO_TEST_DIR}}|${REPO_TEST_DIR}|g' \

assets/go-licenses.json

@@ -0,0 +1,74 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+
+package main
+
+import (
+	"encoding/json"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+)
+
+// regexp is based on go-license, excluding README and NOTICE
+// https://github.com/google/go-licenses/blob/master/licenses/find.go
+var licenseRe = regexp.MustCompile(`^(?i)((UN)?LICEN(S|C)E|COPYING).*$`)
+
+type LicenseEntry struct {
+	Name        string `json:"name"`
+	Path        string `json:"path"`
+	LicenseText string `json:"licenseText"`
+}
+
+func main() {
+	base, out := os.Args[1], os.Args[2]
+
+	paths := []string{}
+	err := filepath.WalkDir(base, func(path string, entry fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if entry.IsDir() || !licenseRe.MatchString(entry.Name()) {
+			return nil
+		}
+		paths = append(paths, path)
+		return nil
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	sort.Strings(paths)
+
+	entries := []LicenseEntry{}
+	for _, path := range paths {
+		licenseText, err := os.ReadFile(path)
+		if err != nil {
+			panic(err)
+		}
+
+		path := strings.Replace(path, base+string(os.PathSeparator), "", 1)
+
+		entries = append(entries, LicenseEntry{
+			Name: filepath.Dir(path),
+			Path: path,
+			LicenseText: string(licenseText),
+		})
+	}
+
+	jsonBytes, err := json.MarshalIndent(entries, "", "  ")
+	if err != nil {
+		panic(err)
+	}
+
+	err = os.WriteFile(out, jsonBytes, 0o644)
+	if err != nil {
+		panic(err)
+	}
+}

build/generate-go-licenses.go

@@ -14,6 +14,8 @@ import {readFileSync} from 'fs';
 const {VueLoaderPlugin} = VueLoader;
 const {ESBuildMinifyPlugin} = EsBuildLoader;
 const {SourceMapDevToolPlugin} = webpack;
+const formatLicenseText = (licenseText) => wrapAnsi(licenseText || '', 80).trim();
+
 const glob = (pattern) => fastGlob.sync(pattern, {
   cwd: dirname(fileURLToPath(new URL(import.meta.url))),
   absolute: true,
@@ -206,10 +208,12 @@ export default {
       outputFilename: 'js/licenses.txt',
       outputWriter: ({dependencies}) => {
         const line = '-'.repeat(80);
-        const goModules = JSON.parse(readFileSync('assets/go-licenses.json', 'utf8'));
+        const goJson = readFileSync('assets/go-licenses.json', 'utf8');
+        const goModules = JSON.parse(goJson).map(({name, licenseText}) => {
+          return {name, body: formatLicenseText(licenseText)};
+        });
         const jsModules = dependencies.map(({name, version, licenseName, licenseText}) => {
-          const body = wrapAnsi(licenseText || '', 80);
-          return {name, version, licenseName, body};
+          return {name, version, licenseName, body: formatLicenseText(licenseText)};
         });
 
         const modules = [...goModules, ...jsModules].sort((a, b) => a.name.localeCompare(b.name));