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leveldbAuthBackend.go
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leveldbAuthBackend.go
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package httpauth
import (
"encoding/json"
"errors"
"fmt"
"github.com/syndtr/goleveldb/leveldb"
"os"
)
// ErrMissingLeveldbBackend is returned by NewLeveldbAuthBackend when the file
// doesn't exist. Be sure to create (or touch) it if using brand new backend or
// resetting backend.
var (
ErrMissingLeveldbBackend = errors.New("leveldbauthbackend: missing backend")
)
// LeveldbAuthBackend stores user data and the location of a leveldb file.
//
// Current implementation holds all user data in memory, flushing to leveldb
// as a single value to the key "httpauth::userdata" on saves.
type LeveldbAuthBackend struct {
filepath string
users map[string]UserData
}
// NewLeveldbAuthBackend initializes a new backend by loading a map of users
// from a file.
// If the file doesn't exist, returns an error.
func NewLeveldbAuthBackend(filepath string) (b LeveldbAuthBackend, e error) {
b.filepath = filepath
if _, err := os.Stat(b.filepath); err == nil {
db, err := leveldb.OpenFile(b.filepath, nil)
defer db.Close()
if err != nil {
return b, fmt.Errorf("leveldbauthbackend: %v", err.Error())
}
data, err := db.Get([]byte("httpauth::userdata"), nil)
err = json.Unmarshal(data, &b.users)
if err != nil {
b.users = make(map[string]UserData)
}
} else {
return b, ErrMissingLeveldbBackend
}
if b.users == nil {
b.users = make(map[string]UserData)
}
return b, nil
}
// User returns the user with the given username. Error is set to
// ErrMissingUser if user is not found.
func (b LeveldbAuthBackend) User(username string) (user UserData, e error) {
if user, ok := b.users[username]; ok {
return user, nil
}
return user, ErrMissingUser
}
// Users returns a slice of all users.
func (b LeveldbAuthBackend) Users() (us []UserData, e error) {
for _, user := range b.users {
us = append(us, user)
}
return
}
// SaveUser adds a new user, replacing one with the same username, and flushes
// to the db.
func (b LeveldbAuthBackend) SaveUser(user UserData) error {
b.users[user.Username] = user
err := b.save()
return err
}
func (b LeveldbAuthBackend) save() error {
db, err := leveldb.OpenFile(b.filepath, nil)
defer db.Close()
if err != nil {
return errors.New("leveldbauthbackend: failed to edit auth file")
}
data, err := json.Marshal(b.users)
if err != nil {
return errors.New(fmt.Sprintf("leveldbauthbackend: save: %v", err))
}
err = db.Put([]byte("httpauth::userdata"), data, nil)
if err != nil {
return errors.New(fmt.Sprintf("leveldbauthbackend: save: %v", err))
}
return nil
}
// DeleteUser removes a user, raising ErrDeleteNull if that user was missing.
func (b LeveldbAuthBackend) DeleteUser(username string) error {
_, err := b.User(username)
if err == ErrMissingUser {
return ErrDeleteNull
} else if err != nil {
return fmt.Errorf("leveldbauthbackend: %v", err)
}
delete(b.users, username)
return b.save()
}
// Close cleans up the backend. Currently a no-op for gobfiles.
func (b LeveldbAuthBackend) Close() {
}