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auth.go
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auth.go
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package auth
import (
"errors"
"fmt"
"math/rand"
"sync"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/oklog/ulid"
"golang.org/x/crypto/bcrypt"
)
var _ UserLoginHandler = &Auth{}
var _ TokenValidator = &Auth{}
var _ TokenGenerator = &Auth{}
var _ TokenReader = &Auth{}
var _ TokenRemover = &Auth{}
var entropy *rand.Rand
var claimsPool *sync.Pool
func init() {
t := time.Unix(1000000, 0)
entropy = rand.New(rand.NewSource(t.UnixNano()))
claimsPool = &sync.Pool{
New: func() interface{} {
return &Claims{}
},
}
}
func newClaims() *Claims {
return claimsPool.New().(*Claims)
}
func returnClaims(c *Claims) {
*c = Claims{}
claimsPool.Put(c)
}
var (
ErrUnauthorized = errors.New("unauthorized")
ErrNotFound = errors.New("user not found")
ErrExists = errors.New("user exists")
ErrWrongUserPass = errors.New("wrong username or password")
ErrTokenExpired = errors.New("token expired")
)
//Claims contains specific claims used in the auth system
type Claims struct {
jwt.StandardClaims
Username string `json:"username"`
Name string `json:"name"`
Scope Scope `json:"scope"`
}
type Opts struct {
TokenTTL time.Duration
PasswordSecret []byte
}
type UserStore interface {
SaveUser(User) error
GetUser(string, *User) error
GetUserByUsername(string, *User) error
DeleteUser(string) error
AllUsers(page, pageSize int) ([]*User, error)
}
type UserTokenStore interface {
GetUserToken(string, *Token) error
GetUserTokenByValue(string, *Token) error
GetUserTokens(user string) ([]Token, error)
DeleteUserToken(id string) error
SaveUserToken(Token) error
}
var _ UserReadWriter = &Auth{}
type Auth struct {
users UserStore
tokens UserTokenStore
opts Opts
}
//New returns a default authentication service
func New(users UserStore, tokens UserTokenStore, opts Opts) *Auth {
return &Auth{users: users, tokens: tokens, opts: opts}
}
func (a *Auth) Login(username, password string) (string, error) {
u := newUser()
defer returnUser(u)
err := a.users.GetUserByUsername(username, u)
if err != nil {
return "", err
}
err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
if err != nil {
return "", ErrWrongUserPass
}
return buildJwt(u.ID, u.Username, u.Name, a.opts.PasswordSecret, a.opts.TokenTTL, u.Scope)
}
func (a *Auth) ValidateToken(token string, u *User, cs *Claims, update bool) (string, error) {
tok := newToken()
defer releaseToken(tok)
err := a.tokens.GetUserTokenByValue(token, tok)
// if token found, validate
if err != nil {
if err != ErrNotFound {
return "", fmt.Errorf("could not fetch token: %w", err)
}
err = parseJwt(token, a.opts.PasswordSecret, cs)
if err != nil {
return token, fmt.Errorf("could not parse token: %w", err)
}
} else {
if !tok.ExpiresAt.IsZero() && tok.ExpiresAt.Before(time.Now()) {
return "", ErrTokenExpired
}
// we need to populate claims by hand
cs.Id = tok.Owner
now := time.Now()
cs.IssuedAt = now.Unix()
cs.Scope = tok.Scope
cs.ExpiresAt = now.Add(a.opts.TokenTTL).Unix()
}
err = a.users.GetUser(cs.Id, u)
if err != nil {
return token, fmt.Errorf("could not get user: %w", err)
}
if !update {
return token, nil
}
return u.toJwt(a.opts.PasswordSecret, u.Scope, a.opts.TokenTTL)
}
func (a *Auth) Logout(User) error {
// TODO: add logout hooks support
return nil
}
func (a *Auth) CreateUser(u User) error {
ID, err := ulid.New(ulid.Timestamp(time.Now()), entropy)
if err != nil {
return fmt.Errorf("could not init generator: %w", err)
}
u.ID = ID.String()
pwd, err := bcrypt.GenerateFromPassword([]byte(u.Password), 10)
if err != nil {
return fmt.Errorf("could not generate password: %w", err)
}
u.Password = string(pwd)
if a.users == nil {
return nil
}
return a.users.SaveUser(u)
}
func (a *Auth) GetUser(ID string, u *User) error {
err := a.users.GetUser(ID, u)
if err != nil {
return err
}
return err
}
func (a *Auth) GetAllUsers() ([]*User, error) {
return a.users.AllUsers(0, 10)
}
func (a *Auth) GenerateUserToken(owner, description string, scope Scope, expires time.Time) (Token, error) {
token, err := generateToken(owner, description, scope, expires, 24)
if err != nil {
return Token{}, fmt.Errorf("could not generate token: %w", err)
}
err = a.tokens.SaveUserToken(token)
if err != nil {
return Token{}, fmt.Errorf("could not save token: %w", err)
}
return token, nil
}
func (a *Auth) GetUserTokens(user string) ([]Token, error) {
return a.tokens.GetUserTokens(user)
}
func (a *Auth) GetUserToken(id string, t *Token) error {
return a.tokens.GetUserToken(id, t)
}
func (a *Auth) DeleteUserToken(id string, u *User) error {
tok := newToken()
defer releaseToken(tok)
err := a.tokens.GetUserToken(id, tok)
if err != nil {
return fmt.Errorf("could not verify token: %w", err)
}
if tok.Owner != u.ID {
return ErrUnauthorized
}
return a.tokens.DeleteUserToken(id)
}