✨ Add commands to manage users

cmd_user.go

@@ -0,0 +1,131 @@
+// Copyright (c) 2020, Andreas Schneider
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the <organization> nor the
+//       names of its contributors may be used to endorse or promote products
+//       derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+package main
+
+import (
+	"fmt"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type CmdUser struct {
+	CmdList   CmdUserList   `cmd:"" name:"list" help:"List all users."`
+	CmdAdd    CmdUserAdd    `cmd:"" name:"add" help:"Add a user."`
+	CmdUpdate CmdUserUpdate `cmd:"" name:"update" help:"Update a user."`
+	CmdDelete CmdUserDelete `cmd:"" name:"delete" help:"Delete a user."`
+}
+
+type CmdUserList struct{}
+
+func (cmd CmdUserList) Run(app *app) error {
+	users, err := app.userStore.GetUsers()
+	if err != nil {
+		return err
+	}
+
+	for _, user := range users {
+		fmt.Printf("* %s (%s)\n", user.Username, user.Role)
+	}
+
+	return nil
+}
+
+type CmdUserAdd struct {
+	Username string     `arg:"" name:"username" help:"The username to be added."`
+	Password string     `name:"password" help:"The password of the new user."`
+	Role     GlobalRole `name:"role" default:"user" help:"Role of the user. 'admin' or ' user'"`
+}
+
+func (cmd CmdUserAdd) Run(app *app) error {
+	switch cmd.Role {
+	case GlobalRoleUser:
+	case GlobalRoleAdmin:
+	default:
+		return fmt.Errorf("invalid user role")
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(cmd.Password), 0)
+	if err != nil {
+		return fmt.Errorf("cannot hash password: %w", err)
+	}
+
+	user := User{
+		Username: cmd.Username,
+		Password: string(hash),
+		Role:     cmd.Role,
+	}
+	return app.userStore.AddUser(user)
+}
+
+type CmdUserUpdate struct {
+	Username string     `arg:"" name:"username" help:"The username of the user to be updated."`
+	Password string     `name:"password" help:"Update the password, if set."`
+	Role     GlobalRole `name:"role" default:"user" help:"Update the role, if set. 'admin' or ' user'"`
+}
+
+func (cmd CmdUserUpdate) Run(app *app) error {
+	user, err := app.userStore.GetUser(cmd.Username)
+	if err != nil {
+		return err
+	}
+
+	changed := false
+
+	if cmd.Role != "" && cmd.Role != user.Role {
+		switch cmd.Role {
+		case GlobalRoleUser:
+		case GlobalRoleAdmin:
+		default:
+			return fmt.Errorf("invalid user role")
+		}
+
+		user.Role = cmd.Role
+		changed = true
+	}
+
+	if cmd.Password != "" {
+		hash, err := bcrypt.GenerateFromPassword([]byte(cmd.Password), 0)
+		if err != nil {
+			return fmt.Errorf("cannot hash password: %w", err)
+		}
+		user.Password = string(hash)
+		changed = true
+	}
+
+	if !changed {
+		// Nothing changed. Nothing to write. Not different from a successful write to the user.
+		return nil
+	}
+
+	return app.userStore.Update(user)
+}
+
+type CmdUserDelete struct {
+	Username string `arg:"" name:"username" help:"The username of the user to be deleted."`
+}
+
+func (cmd CmdUserDelete) Run(app *app) error {
+	return app.userStore.RemoveUser(cmd.Username)
+}