128 lines
3.1 KiB
Go
128 lines
3.1 KiB
Go
package auth
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import (
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"context"
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"crypto/rand"
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"database/sql"
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"encoding/base64"
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"errors"
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"fmt"
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"net/http"
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"os"
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"time"
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"golang.org/x/crypto/bcrypt"
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"mal/internal/db"
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)
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var (
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ErrInvalidCredentials = errors.New("invalid username or password")
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ErrNotAuthenticated = errors.New("not authenticated")
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)
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type Service struct {
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db db.Querier
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}
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func NewService(db db.Querier) *Service {
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return &Service{db: db}
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}
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// generateToken creates a cryptographically random base64-encoded token
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func generateToken(size int) (string, error) {
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b := make([]byte, size)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return base64.URLEncoding.EncodeToString(b), nil
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}
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// generateSessionToken creates a 32-byte session token
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func generateSessionToken() (string, error) {
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return generateToken(32)
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}
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func (s *Service) Login(ctx context.Context, username, password string) (*db.Session, error) {
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user, err := s.db.GetUserByUsername(ctx, username)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return nil, ErrInvalidCredentials
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}
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return nil, fmt.Errorf("failed to lookup user: %w", err)
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}
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if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password)); err != nil {
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return nil, ErrInvalidCredentials
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}
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token, err := generateSessionToken()
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if err != nil {
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return nil, fmt.Errorf("failed to generate session token: %w", err)
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}
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expiresAt := time.Now().Add(30 * 24 * time.Hour) // 30 days
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session, err := s.db.CreateSession(ctx, db.CreateSessionParams{
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ID: token,
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UserID: user.ID,
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ExpiresAt: expiresAt,
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})
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if err != nil {
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return nil, fmt.Errorf("failed to create session: %w", err)
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}
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return &session, nil
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}
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func (s *Service) ValidateSession(ctx context.Context, sessionID string) (*db.User, error) {
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session, err := s.db.GetSession(ctx, sessionID)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return nil, ErrNotAuthenticated
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}
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return nil, fmt.Errorf("failed to get session: %w", err)
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}
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if time.Now().After(session.ExpiresAt) {
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_ = s.db.DeleteSession(ctx, sessionID) // clean up expired session
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return nil, ErrNotAuthenticated
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}
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user, err := s.db.GetUser(ctx, session.UserID)
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if err != nil {
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return nil, fmt.Errorf("failed to get user for session: %w", err)
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}
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return &user, nil
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}
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// SetSessionCookie sets an http-only, secure session cookie
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func SetSessionCookie(w http.ResponseWriter, sessionID string, expiresAt time.Time) {
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secure := os.Getenv("ENV") == "production" || os.Getenv("FORCE_SECURE_COOKIES") == "true"
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http.SetCookie(w, &http.Cookie{
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Name: "session_id",
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Value: sessionID,
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Expires: expiresAt,
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HttpOnly: true,
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Secure: secure,
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SameSite: http.SameSiteStrictMode,
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Path: "/",
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})
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}
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func (s *Service) Logout(ctx context.Context, sessionID string) error {
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return s.db.DeleteSession(ctx, sessionID)
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}
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// ClearSessionCookie invalidates the session cookie
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func ClearSessionCookie(w http.ResponseWriter) {
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http.SetCookie(w, &http.Cookie{
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Name: "session_id",
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Value: "",
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Expires: time.Unix(0, 0), // epoch to expire immediately
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MaxAge: -1,
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HttpOnly: true,
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Path: "/",
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})
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}
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