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package auth
import (
"context"
"errors"
"fmt"
"strings"
"time"
"github.com/jackc/pgx/v5"
"golang.org/x/crypto/bcrypt"
"github.com/nsfisis/iosdc-japan-2024-albatross/backend/auth/fortee"
"github.com/nsfisis/iosdc-japan-2024-albatross/backend/db"
)
var (
ErrInvalidRegistrationToken = errors.New("invalid registration token")
ErrNoRegistrationToken = errors.New("no registration token")
ErrForteeLoginTimeout = errors.New("fortee login timeout")
ErrForteeEmailUsed = errors.New("fortee email used")
)
const (
forteeAPITimeout = 3 * time.Second
)
func Login(
ctx context.Context,
queries *db.Queries,
username string,
password string,
registrationToken *string,
) (int, error) {
userAuth, err := queries.GetUserAuthByUsername(ctx, username)
if err != nil {
if errors.Is(err, pgx.ErrNoRows) {
err := signup(ctx, queries, username, password, registrationToken)
if err != nil {
return 0, err
}
return Login(ctx, queries, username, password, nil)
}
return 0, err
}
if userAuth.AuthType == "password" {
passwordHash := userAuth.PasswordHash
if passwordHash == nil {
panic("inconsistant data")
}
err := bcrypt.CompareHashAndPassword([]byte(*passwordHash), []byte(password))
if err != nil {
return 0, err
}
return int(userAuth.UserID), nil
} else if userAuth.AuthType == "fortee" {
if err := verifyForteeAccount(ctx, username, password); err != nil {
return 0, err
}
return int(userAuth.UserID), nil
}
panic(fmt.Sprintf("unexpected auth type: %s", userAuth.AuthType))
}
func signup(
ctx context.Context,
queries *db.Queries,
username string,
password string,
registrationToken *string,
) error {
if err := verifyRegistrationToken(ctx, queries, registrationToken); err != nil {
return err
}
if err := verifyForteeAccount(ctx, username, password); err != nil {
return err
}
// TODO: transaction
userID, err := queries.CreateUser(ctx, username)
if err != nil {
return err
}
if err := queries.CreateUserAuth(ctx, db.CreateUserAuthParams{
UserID: userID,
AuthType: "fortee",
}); err != nil {
return err
}
return nil
}
func verifyRegistrationToken(ctx context.Context, queries *db.Queries, registrationToken *string) error {
if registrationToken == nil {
return ErrNoRegistrationToken
}
exists, err := queries.IsRegistrationTokenValid(ctx, *registrationToken)
if err != nil {
return err
}
if !exists {
return ErrInvalidRegistrationToken
}
return nil
}
func verifyForteeAccount(ctx context.Context, username string, password string) error {
// fortee API allows login with email address, but this system disallows it.
if strings.Contains(username, "@") {
return ErrForteeEmailUsed
}
ctx, cancel := context.WithTimeout(ctx, forteeAPITimeout)
defer cancel()
err := fortee.LoginFortee(ctx, username, password)
if errors.Is(err, context.DeadlineExceeded) {
return ErrForteeLoginTimeout
}
return err
}
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