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authenticator.go
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authenticator.go
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package auth
import "time"
// Authenticator is user authenticator and token generator
type Authenticator struct {
generator *TokenGenerator
lifetime time.Duration
refreshLifetime time.Duration
storage Storage
}
// NewAuthenticator creates a Authenticator
func NewAuthenticator(generator *TokenGenerator, storage Storage, lifetime time.Duration, refreshLifetime time.Duration) *Authenticator {
return &Authenticator{
generator: generator,
storage: storage,
lifetime: lifetime,
}
}
// Authenticate user and generate token
func (a *Authenticator) Authenticate(user string, pass string) (string, string, error) {
u, err := a.storage.Authenticate(user, pass)
if err != nil {
return "", "", err
}
token, err := a.Generate(u)
if err != nil {
return "", "", err
}
refresh, err := a.GenerateRefresh(u)
if err != nil {
return "", "", err
}
return token, refresh, nil
}
// ValidateToken token and return UID
func (a *Authenticator) ValidateToken(token string) (*User, error) {
user, typ, err := a.validate(token)
if err != nil {
return nil, err
}
if typ != "token" {
return nil, ErrTokenInvalid
}
return user, nil
}
// ValidateRefresh refresh token and return UID
func (a *Authenticator) ValidateRefresh(token string) (*User, error) {
user, typ, err := a.validate(token)
if err != nil {
return nil, err
}
if typ != "refresh" {
return nil, ErrTokenInvalid
}
return user, nil
}
func (a *Authenticator) validate(token string) (*User, string, error) {
parsed, err := a.generator.Verify(token)
if err != nil {
return nil, "", err
}
uid, ok := parsed.Claims["uid"].(string)
if !ok {
return nil, "", ErrTokenInvalid
}
typ, ok := parsed.Claims["type"].(string)
if !ok {
return nil, "", ErrTokenInvalid
}
permissions, ok := parsed.Claims["permissions"].([]interface{})
if !ok {
return nil, "", ErrTokenInvalid
}
user := &User{
UID: uid,
Permissions: make([]string, 0, len(permissions)),
}
for _, permission := range permissions {
if p, ok := permission.(string); ok {
user.Permissions = append(user.Permissions, p)
}
}
return user, typ, nil
}
// Generate token for UID
func (a *Authenticator) Generate(user *User) (string, error) {
token := a.generator.Create()
if a.lifetime > 0 {
token.Claims["exp"] = time.Now().Add(a.lifetime).Unix()
}
token.Claims["uid"] = user.UID
token.Claims["type"] = "token"
token.Claims["permissions"] = []string{}
if user.Permissions != nil {
token.Claims["permissions"] = user.Permissions
}
return a.generator.Sign(token)
}
// GenerateRefresh generates a refresh token for UID
func (a *Authenticator) GenerateRefresh(user *User) (string, error) {
token := a.generator.Create()
if a.lifetime > 0 {
token.Claims["exp"] = time.Now().Add(a.refreshLifetime).Unix()
}
token.Claims["uid"] = user.UID
token.Claims["type"] = "refresh"
token.Claims["permissions"] = []string{}
if user.Permissions != nil {
token.Claims["permissions"] = user.Permissions
}
return a.generator.Sign(token)
}