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package auth
import (
"errors"
"log"
"time"
"golang.org/x/oauth2"
"github.com/gbrlsnchs/jwt/v3"
)
var (
singingSecret = jwt.NewHS512([]byte("the wolf says moo"))
// ErrInvalidToken error for token
ErrInvalidToken = errors.New("Invalid token provided")
// ErrInvalidJWT error for jwt
ErrInvalidJWT = errors.New("Invalid JWT")
// ErrUnauthorized error for unauthorized access
ErrUnauthorized = errors.New("Unauthorized")
)
// Servicer access to auth functionality
type Servicer interface {
LoginOrRegisterSessionID(t *oauth2.Token, gp *GoogleAuthProfile) (string, bool, error)
GenerateStateToken() (string, error)
ValidateStateToken(token string, sessionToken string) (bool, error)
}
// Service a container for auth deps
type Service struct {
repo Repo
}
// NewService create auth service
func NewService(repo Repo) *Service {
return &Service{
repo,
}
}
// GenerateStateToken create a random token for oauth exchange
func (a *Service) GenerateStateToken() (string, error) {
now := time.Now()
pl := jwt.Payload{
Issuer: "iserv-state",
Subject: "state param",
IssuedAt: jwt.NumericDate(now),
}
tokenBytes, err := jwt.Sign(pl, singingSecret)
if err != nil {
return "", err
}
return string(tokenBytes[:]), err
}
// ValidateStateToken validate provided token
func (a *Service) ValidateStateToken(token string, sessionToken string) (bool, error) {
if token == sessionToken {
p := jwt.Payload{}
_, err := jwt.Verify([]byte(token), singingSecret, &p)
if err != nil {
return false, ErrInvalidJWT
}
return true, nil
}
return false, ErrInvalidToken
}
// LoginOrRegisterSessionID create a login
func (a *Service) LoginOrRegisterSessionID(t *oauth2.Token, gp *GoogleAuthProfile) (string, bool, error) {
isAuthorized, err := a.repo.IsAuthorized(gp)
newRegistration := false
if err != nil {
return "", newRegistration, err
}
if isAuthorized != true {
return "", newRegistration, ErrUnauthorized
}
profileID, err := a.repo.LookUpAuthProfileID(gp)
if err != nil {
return "", newRegistration, err
}
if profileID == "" {
// create profile
log.Printf("creating new profile")
profile := NewAuthProfile(t, gp)
profileID = profile.ID
log.Printf("new profile %+v", profile)
err = a.repo.SaveAuthProfile(profile)
if err != nil {
return "", newRegistration, err
}
newRegistration = true
}
return profileID, newRegistration, nil
}
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