Implements generator cli for secrets (#3531)

Signed-off-by: Codruț Constantin Gușoi <codrut.gusoi@gmail.com>

cmd/generate.go

@@ -0,0 +1,83 @@
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// Copyright 2016 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.
+
+package cmd
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/modules/generate"
+
+	"github.com/urfave/cli"
+)
+
+var (
+	// CmdGenerate represents the available generate sub-command.
+	CmdGenerate = cli.Command{
+		Name:  "generate",
+		Usage: "Command line interface for running generators",
+		Subcommands: []cli.Command{
+			subcmdSecret,
+		},
+	}
+
+	subcmdSecret = cli.Command{
+		Name:  "secret",
+		Usage: "Generate a secret token",
+		Subcommands: []cli.Command{
+			microcmdGenerateInternalToken,
+			microcmdGenerateLfsJwtSecret,
+			microcmdGenerateSecretKey,
+		},
+	}
+
+	microcmdGenerateInternalToken = cli.Command{
+		Name:   "INTERNAL_TOKEN",
+		Usage:  "Generate a new INTERNAL_TOKEN",
+		Action: runGenerateInternalToken,
+	}
+
+	microcmdGenerateLfsJwtSecret = cli.Command{
+		Name:   "LFS_JWT_SECRET",
+		Usage:  "Generate a new LFS_JWT_SECRET",
+		Action: runGenerateLfsJwtSecret,
+	}
+
+	microcmdGenerateSecretKey = cli.Command{
+		Name:   "SECRET_KEY",
+		Usage:  "Generate a new SECRET_KEY",
+		Action: runGenerateSecretKey,
+	}
+)
+
+func runGenerateInternalToken(c *cli.Context) error {
+	internalToken, err := generate.NewInternalToken()
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%s\n", internalToken)
+	return nil
+}
+
+func runGenerateLfsJwtSecret(c *cli.Context) error {
+	JWTSecretBase64, err := generate.NewLfsJwtSecret()
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%s\n", JWTSecretBase64)
+	return nil
+}
+
+func runGenerateSecretKey(c *cli.Context) error {
+	secretKey, err := generate.NewSecretKey()
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%s\n", secretKey)
+	return nil
+}