ShareDAV/store.go

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// 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 (
"errors"
"fmt"
"strings"
uuid "github.com/satori/go.uuid"
"github.com/tidwall/buntdb"
"golang.org/x/crypto/bcrypt"
)
type UserStore interface {
AddUser(user User) (err error)
GetUser(username string) (user User, err error)
GetUsers() ([]User, error)
Update(user User) error
RemoveUser(username string) (err error)
}
type ShareStore interface {
}
var _ UserStore = &DBStore{}
type GlobalRole string
const (
GlobalRoleUser GlobalRole = "user"
GlobalRoleAdmin GlobalRole = "admin"
)
type ShareRole string
const (
ShareRoleReader ShareRole = "reader"
ShareRoleWriter ShareRole = "writer"
ShareRoleAdmin ShareRole = "admin"
)
type User struct {
Username string
Password string
Role GlobalRole
}
type Share struct {
UUID uuid.UUID
Directory string
Users []ShareUser
}
type ShareUser struct {
Username string
Role ShareRole
Logins []Login
}
type Login struct {
Loginname string
Password string
}
const usersPrefix = "users:"
type DBStore struct {
db *buntdb.DB
}
func (u User) key() string {
return usersPrefix + u.Username
}
func (u User) prefix() string {
return fmt.Sprintf("user:%s", u.Username)
}
func (u User) roleKey() string {
return u.prefix() + ":role"
}
func (u User) passwordKey() string {
return u.prefix() + ":password"
}
func NewDBStore(filename string) (*DBStore, error) {
db, err := buntdb.Open(filename)
if err != nil {
return nil, err
}
return &DBStore{db}, nil
}
func (store *DBStore) Close() error {
return store.db.Close()
}
var ErrExists = errors.New("key already exists")
var ErrUserNotFound = errors.New("user not found")
var ErrInvalidUsername = errors.New("invalid username")
func (store *DBStore) setUserValues(tx *buntdb.Tx, user User) (exists bool, err error) {
pwString, err := buildPassword(user.Username, user.Password)
if err != nil {
return false, fmt.Errorf("cannot hash password: %w", err)
}
if _, replaced, err := tx.Set(user.roleKey(), string(user.Role), nil); err != nil {
return false, err
} else if replaced {
exists = true
}
if _, replaced, err := tx.Set(user.passwordKey(), pwString, nil); err != nil {
return false, err
} else if replaced {
exists = true
}
return exists, nil
}
func (store *DBStore) AddUser(user User) (err error) {
if strings.Contains(user.Username, ":") {
return ErrInvalidUsername
}
if err = store.db.Update(func(tx *buntdb.Tx) error {
if _, exists, err := tx.Set(user.key(), "", nil); err != nil {
return err
} else if exists {
return ErrExists
}
if exists, err := store.setUserValues(tx, user); err != nil {
return err
} else if exists {
return ErrExists
}
return nil
}); err != nil {
return err
}
return nil
}
func (store *DBStore) GetUser(username string) (user User, err error) {
if strings.Contains(username, ":") {
return user, ErrInvalidUsername
}
user.Username = username
if err := store.db.View(func(tx *buntdb.Tx) error {
if val, err := tx.Get(user.roleKey()); err != nil && err != buntdb.ErrNotFound {
return err
} else if err == buntdb.ErrNotFound {
return ErrUserNotFound
} else {
user.Role = GlobalRole(val)
}
if val, err := tx.Get(user.passwordKey()); err != nil && err != buntdb.ErrNotFound {
return err
} else if err == buntdb.ErrNotFound {
return ErrUserNotFound
} else {
user.Password = val
}
return nil
}); err != nil {
return user, err
}
return user, nil
}
func (store *DBStore) GetUsers() (users []User, err error) {
err = store.db.View(func(tx *buntdb.Tx) error {
if err := tx.AscendKeys(usersPrefix+"*", func(key, value string) bool {
var user User
user.Username = strings.TrimPrefix(key, usersPrefix)
users = append(users, user)
return true
}); err != nil {
return err
}
for i := range users {
if roleString, err := tx.Get(users[i].roleKey()); err != nil {
return err
} else {
users[i].Role = GlobalRole(roleString)
}
}
return nil
})
return users, err
}
func (store *DBStore) Update(user User) error {
if strings.Contains(user.Username, ":") {
return ErrInvalidUsername
}
return store.db.Update(func(tx *buntdb.Tx) error {
_, err := store.setUserValues(tx, user)
return err
})
}
func (store *DBStore) RemoveUser(username string) (err error) {
if strings.Contains(username, ":") {
return ErrInvalidUsername
}
return store.db.Update(func(tx *buntdb.Tx) error {
user := User{Username: username}
// Delete the main key first. This is a good indicator if the user generally exists.
if _, err := tx.Delete(user.key()); err == buntdb.ErrNotFound {
return ErrUserNotFound
} else if err != nil {
return err
}
// Now get all attributes and delete them as well. One by one.
var keys []string
if err := tx.AscendKeys(user.prefix()+":*", func(key, value string) bool {
keys = append(keys, key)
return true
}); err != nil {
return fmt.Errorf("cannot iterate keys: %w", err)
}
for _, key := range keys {
if _, err := tx.Delete(key); err != nil {
return fmt.Errorf("cannot remove key: %w", err)
}
}
return nil
})
}
func buildPassword(username string, password string) (string, error) {
hash, err := bcrypt.GenerateFromPassword([]byte(password), 0)
if err != nil {
return "", err
}
return fmt.Sprintf("%s:%s", username, hash), nil
}