🚧 Began store implementation for buntdb: get user, add user, set login
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6e71ac45ee
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package main
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import (
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"errors"
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"fmt"
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"github.com/tidwall/buntdb"
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"golang.org/x/crypto/bcrypt"
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"strings"
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"time"
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)
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type UserStore interface {
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AddUser(username string, role GlobalRole, password string) (err error)
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GetUser(username string) (user User, err error)
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GetLogin(username string, password string) (appName string, err error)
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SetLogin(username string, appName string, password string) (err error)
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RemoveLogin(username string, appName string) (err error)
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RemoveUser(username string) (err error)
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}
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type ShareStore interface {
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}
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type GlobalRole string
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const (
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GlobalRoleUser GlobalRole = "user"
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GlobalRoleManager GlobalRole = "manager"
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GlobalRoleAdmin GlobalRole = "admin"
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)
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type ShareRole string
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const (
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ShareRoleReader ShareRole = "reader"
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ShareRoleWriter ShareRole = "writer"
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ShareRoleAdmin ShareRole = "admin"
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)
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type User struct {
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Username string
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Role GlobalRole
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Apps []App
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}
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type App struct {
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Name string
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CreatedAt time.Time
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}
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type Share struct {
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Directory string
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Users []ShareUser
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}
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type ShareUser struct {
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Username string
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Role ShareRole
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}
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type DBStore struct {
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db *buntdb.DB
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}
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func NewDBStore(filename string) (*DBStore, error) {
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db, err := buntdb.Open(filename)
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if err != nil {
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return nil, err
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}
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if err := db.CreateIndex("login", "user:*:login*", buntdb.IndexBinary); err != nil && err != buntdb.ErrIndexExists {
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return nil, errors.New("cannot create login index: " + err.Error())
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}
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return &DBStore{db}, nil
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}
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var ErrExists = errors.New("key already exists")
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var ErrUserNotFound = errors.New("user not found")
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var ErrInvalidUsername = errors.New("invalid username")
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func (store *DBStore) AddUser(username string, role GlobalRole, password string) (err error) {
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if strings.Contains(username, ":") {
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return ErrInvalidUsername
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}
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pwString, err := buildPassword(username, password)
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if err != nil {
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return err
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}
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if err = store.db.Update(func(tx *buntdb.Tx) error {
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if _, replaced, err := tx.Set(fmt.Sprintf("user:%s:role", username), string(role), nil); err != nil {
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return err
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} else if replaced {
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return ErrExists
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}
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if _, replaced, err := tx.Set(fmt.Sprintf("user:%s:login", username), pwString, nil); err != nil {
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return err
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} else if replaced {
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return ErrExists
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}
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// just in case ...
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if _, err := tx.Delete(fmt.Sprintf("user:%s:login:*", username)); err != nil {
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return err
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}
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return nil
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}); err != nil {
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return err
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}
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return nil
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}
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func (store *DBStore) GetUser(username string) (user User, err error) {
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if strings.Contains(username, ":") {
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return user, ErrInvalidUsername
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}
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user.Username = username
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if err := store.db.View(func(tx *buntdb.Tx) error {
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if val, err := tx.Get(fmt.Sprintf("user:%s:role", username)); err != nil && err != buntdb.ErrNotFound {
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return err
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} else {
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user.Role = GlobalRole(val)
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}
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loginPrefix := fmt.Sprintf("user:%s:login:", username)
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if err := tx.AscendKeys(loginPrefix + "*", func(key, value string) bool {
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app := App{Name: strings.TrimPrefix(key, loginPrefix)}
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creationTimeValue, err := tx.Get(fmt.Sprintf("user:%s:app:%s:created_at", username, app.Name))
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if err != nil {
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// invalid app ... move along
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return true
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}
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creationTime, err := time.Parse(time.RFC3339Nano, creationTimeValue)
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if err != nil {
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// invalid creation time ... invalid app ... move along.
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return true
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}
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app.CreatedAt = creationTime
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user.Apps = append(user.Apps, app)
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return true
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}); err != nil {
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return err
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}
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return nil
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}); err != nil {
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return user, err
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}
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return user, nil
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}
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func (store *DBStore) GetLogin(username string, password string) (appName string, err error) {
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panic("implement me")
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}
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func (store *DBStore) SetLogin(username string, appName string, password string) (err error) {
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if strings.Contains(username, ":") {
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return ErrInvalidUsername
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}
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pwString, err := buildPassword(username, password)
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if err != nil {
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return err
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}
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return store.db.Update(func(tx *buntdb.Tx) error {
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mainLoginKey := fmt.Sprintf("user:%s:login", username)
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// check if we actually know the user. the current login is a good indicator
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if _, err := tx.Get(mainLoginKey); err != nil {
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if err == buntdb.ErrNotFound {
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return ErrUserNotFound
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} else {
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return err
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}
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}
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saneAppName := strings.TrimSpace(appName)
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// if no appname is given, we apparently have to update the password of the whole account.
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if saneAppName == "" {
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if _, _, err := tx.Set(mainLoginKey, pwString, nil); err != nil {
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return err
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}
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} else {
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if _, replaced, err := tx.Set(fmt.Sprintf("%s:%s", mainLoginKey, saneAppName), pwString, nil); err != nil {
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return err
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} else if !replaced {
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// o,h so this is a new key. set the timestamp
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creationTime := time.Now().Format(time.RFC3339Nano)
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if _, _, err := tx.Set(fmt.Sprintf("user:%s:app:%s:created_at", username, saneAppName), creationTime, nil); err != nil {
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return err
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}
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}
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}
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return nil
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})
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}
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func (store *DBStore) RemoveLogin(username string, appName string) (err error) {
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panic("implement me")
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}
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func (store *DBStore) RemoveUser(username string) (err error) {
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if strings.Contains(username, ":") {
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return ErrInvalidUsername
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}
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return store.db.Update(func(tx *buntdb.Tx) error {
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// TODO won't work ... collect keys first, then delete them one by one
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_, err := tx.Delete(fmt.Sprintf("user:%s:*", username))
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return err
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})
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}
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func buildPassword(username string, password string) (string, error) {
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hash, err := bcrypt.GenerateFromPassword([]byte(password), 0)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%s:%s", username, hash), nil
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}
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