fix: ret invalid cred if usr not found in login

apps/backend/internal/auth/service.go

@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"errors"
 
+	"github.com/get-drexa/drexa/internal/password"
 	"github.com/get-drexa/drexa/internal/user"
 	"github.com/google/uuid"
 	"github.com/uptrace/bun"
@@ -39,25 +40,27 @@ func NewService(db *bun.DB, userService *user.Service, tokenConfig TokenConfig)
 	}
 }
 
-func (s *Service) LoginWithEmailAndPassword(ctx context.Context, email, password string) (*LoginResult, error) {
+func (s *Service) LoginWithEmailAndPassword(ctx context.Context, email, plain string) (*LoginResult, error) {
-	var u user.User
+	u, err := s.userService.UserByEmail(ctx, email)
-
-	err := s.db.NewSelect().Model(&u).Where("email = ?", email).Scan(ctx)
 	if err != nil {
+		var nf *user.NotFoundError
+		if errors.As(err, &nf) {
+			return nil, ErrInvalidCredentials
+		}
 		return nil, err
 	}
 
-	ok, err := VerifyPassword(password, u.Password)
+	ok, err := password.Verify(plain, u.Password)
 	if err != nil || !ok {
 		return nil, ErrInvalidCredentials
 	}
 
-	at, err := GenerateAccessToken(&u, &s.tokenConfig)
+	at, err := GenerateAccessToken(u, &s.tokenConfig)
 	if err != nil {
 		return nil, err
 	}
 
-	rt, err := GenerateRefreshToken(&u, &s.tokenConfig)
+	rt, err := GenerateRefreshToken(u, &s.tokenConfig)
 	if err != nil {
 		return nil, err
 	}
@@ -68,48 +71,44 @@ func (s *Service) LoginWithEmailAndPassword(ctx context.Context, email, password
 	}
 
 	return &LoginResult{
-		User:         &u,
+		User:         u,
 		AccessToken:  at,
 		RefreshToken: hex.EncodeToString(rt.Token),
 	}, nil
 }
 
 func (s *Service) Register(ctx context.Context, opts registerOptions) (*LoginResult, error) {
-	u := user.User{
+	hashed, err := password.Hash(opts.password)
+	if err != nil {
+		return nil, err
+	}
+
+	u, err := s.userService.RegisterUser(ctx, user.UserRegistrationOptions{
 		Email:       opts.email,
 		DisplayName: opts.displayName,
-	}
+		Password:    hashed,
-
+	})
-	exists, err := s.db.NewSelect().Model(&u).Where("email = ?", opts.email).Exists(ctx)
-	if err != nil {
-		return nil, err
-	}
-	if exists {
-		return nil, ErrUserExists
-	}
-
-	u.Password, err = HashPassword(opts.password)
 	if err != nil {
 		return nil, err
 	}
 
-	_, err = s.db.NewInsert().Model(&u).Exec(ctx)
+	at, err := GenerateAccessToken(u, &s.tokenConfig)
 	if err != nil {
 		return nil, err
 	}
 
-	at, err := GenerateAccessToken(&u, &s.tokenConfig)
+	rt, err := GenerateRefreshToken(u, &s.tokenConfig)
 	if err != nil {
 		return nil, err
 	}
 
-	rt, err := GenerateRefreshToken(&u, &s.tokenConfig)
+	_, err = s.db.NewInsert().Model(rt).Exec(ctx)
 	if err != nil {
 		return nil, err
 	}
 
 	return &LoginResult{
-		User:         &u,
+		User:         u,
 		AccessToken:  at,
 		RefreshToken: hex.EncodeToString(rt.Token),
 	}, nil

apps/backend/internal/database/errs.go

@@ -0,0 +1,61 @@
+package database
+
+import (
+	"errors"
+
+	"github.com/uptrace/bun/driver/pgdriver"
+)
+
+// PostgreSQL SQLSTATE error codes.
+// See: https://www.postgresql.org/docs/current/errcodes-appendix.html
+const (
+	PgUniqueViolation     = "23505"
+	PgForeignKeyViolation = "23503"
+	PgNotNullViolation    = "23502"
+)
+
+// PostgreSQL protocol error field identifiers used with pgdriver.Error.Field().
+// See: https://www.postgresql.org/docs/current/protocol-error-fields.html
+//
+// Common fields:
+//   - 'C' - SQLSTATE code (e.g., "23505")
+//   - 'M' - Primary error message
+//   - 'D' - Detail message
+//   - 'H' - Hint
+//   - 's' - Schema name
+//   - 't' - Table name
+//   - 'c' - Column name
+//   - 'n' - Constraint name
+const (
+	pgFieldCode       = 'C'
+	pgFieldConstraint = 'n'
+)
+
+// IsUniqueViolation checks if the error is a PostgreSQL unique constraint violation.
+func IsUniqueViolation(err error) bool {
+	return hasPgCode(err, PgUniqueViolation)
+}
+
+// IsForeignKeyViolation checks if the error is a PostgreSQL foreign key violation.
+func IsForeignKeyViolation(err error) bool {
+	return hasPgCode(err, PgForeignKeyViolation)
+}
+
+// IsNotNullViolation checks if the error is a PostgreSQL not-null constraint violation.
+func IsNotNullViolation(err error) bool {
+	return hasPgCode(err, PgNotNullViolation)
+}
+
+// ConstraintName returns the constraint name from a PostgreSQL error, or empty string if not applicable.
+func ConstraintName(err error) string {
+	var pgErr pgdriver.Error
+	if errors.As(err, &pgErr) {
+		return pgErr.Field(pgFieldConstraint)
+	}
+	return ""
+}
+
+func hasPgCode(err error, code string) bool {
+	var pgErr pgdriver.Error
+	return errors.As(err, &pgErr) && pgErr.Field(pgFieldCode) == code
+}

apps/backend/internal/password/password.go

@@ -1,4 +1,4 @@
-package auth
+package password
 
 import (
 	"crypto/rand"
@@ -11,6 +11,10 @@ import (
 	"golang.org/x/crypto/argon2"
 )
 
+// Hashed represents a securely hashed password.
+// This type ensures plaintext passwords cannot be accidentally stored.
+type Hashed string
+
 // argon2id parameters
 const (
 	memory      = 64 * 1024
@@ -34,14 +38,15 @@ type argon2Hash struct {
 	hash        []byte
 }
 
-func HashPassword(password string) (string, error) {
+// Hash securely hashes a plaintext password using argon2id.
+func Hash(plain string) (Hashed, error) {
 	salt := make([]byte, saltLength)
 	if _, err := rand.Read(salt); err != nil {
 		return "", fmt.Errorf("failed to generate salt: %w", err)
 	}
 
 	hash := argon2.IDKey(
-		[]byte(password),
+		[]byte(plain),
 		salt,
 		iterations,
 		memory,
@@ -52,7 +57,7 @@ func HashPassword(password string) (string, error) {
 	b64Salt := base64.RawStdEncoding.EncodeToString(salt)
 	b64Hash := base64.RawStdEncoding.EncodeToString(hash)
 
-	encodedHash := fmt.Sprintf(
+	encoded := fmt.Sprintf(
 		"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
 		argon2.Version,
 		memory,
@@ -62,17 +67,18 @@ func HashPassword(password string) (string, error) {
 		b64Hash,
 	)
 
-	return encodedHash, nil
+	return Hashed(encoded), nil
 }
 
-func VerifyPassword(password, encodedHash string) (bool, error) {
+// Verify checks if a plaintext password matches a hashed password.
-	h, err := decodeHash(encodedHash)
+func Verify(plain string, hashed Hashed) (bool, error) {
+	h, err := decodeHash(string(hashed))
 	if err != nil {
 		return false, err
 	}
 
 	otherHash := argon2.IDKey(
-		[]byte(password),
+		[]byte(plain),
 		h.salt,
 		h.iterations,
 		h.memory,

apps/backend/internal/user/err.go

@@ -7,13 +7,30 @@ import (
 )
 
 type NotFoundError struct {
+	// ID is the ID that was used to try to find the user.
+	// Not set if not tried.
 	id uuid.UUID
+
+	// Email is the email that was used to try to find the user.
+	// Not set if not tried.
+	email string
 }
 
-func newNotFoundError(id uuid.UUID) *NotFoundError {
+func newNotFoundError(id uuid.UUID, email string) *NotFoundError {
-	return &NotFoundError{id}
+	return &NotFoundError{id, email}
 }
-
 func (e *NotFoundError) Error() string {
 	return fmt.Sprintf("user not found: %v", e.id)
 }
+
+type AlreadyExistsError struct {
+	// Email is the email that was used to try to create the user.
+	Email string
+}
+
+func newAlreadyExistsError(email string) *AlreadyExistsError {
+	return &AlreadyExistsError{email}
+}
+func (e *AlreadyExistsError) Error() string {
+	return fmt.Sprintf("user with email %s already exists", e.Email)
+}

apps/backend/internal/user/service.go

@@ -5,6 +5,8 @@ import (
 	"database/sql"
 	"errors"
 
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/password"
 	"github.com/google/uuid"
 	"github.com/uptrace/bun"
 )
@@ -13,20 +15,60 @@ type Service struct {
 	db *bun.DB
 }
 
+type UserRegistrationOptions struct {
+	Email       string
+	DisplayName string
+	Password    password.Hashed
+}
+
 func NewService(db *bun.DB) *Service {
 	return &Service{
 		db: db,
 	}
 }
 
+func (s *Service) RegisterUser(ctx context.Context, opts UserRegistrationOptions) (*User, error) {
+	u := User{
+		Email:       opts.Email,
+		DisplayName: opts.DisplayName,
+		Password:    opts.Password,
+	}
+
+	_, err := s.db.NewInsert().Model(&u).Returning("*").Exec(ctx)
+	if err != nil {
+		if database.IsUniqueViolation(err) {
+			return nil, newAlreadyExistsError(u.Email)
+		}
+		return nil, err
+	}
+
+	return &u, nil
+}
+
 func (s *Service) UserByID(ctx context.Context, id uuid.UUID) (*User, error) {
 	var user User
 	err := s.db.NewSelect().Model(&user).Where("id = ?", id).Scan(ctx)
 	if err != nil {
 		if errors.Is(err, sql.ErrNoRows) {
-			return nil, newNotFoundError(id)
+			return nil, newNotFoundError(id, "")
 		}
 		return nil, err
 	}
 	return &user, nil
 }
+
+func (s *Service) UserByEmail(ctx context.Context, email string) (*User, error) {
+	var user User
+	err := s.db.NewSelect().Model(&user).Where("email = ?", email).Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, newNotFoundError(uuid.Nil, email)
+		}
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (s *Service) UserExistsByEmail(ctx context.Context, email string) (bool, error) {
+	return s.db.NewSelect().Model(&User{}).Where("email = ?", email).Exists(ctx)
+}

apps/backend/internal/user/user.go

@@ -1,6 +1,7 @@
 package user
 
 import (
+	"github.com/get-drexa/drexa/internal/password"
 	"github.com/google/uuid"
 	"github.com/uptrace/bun"
 )
@@ -11,7 +12,7 @@ type User struct {
 	ID                uuid.UUID       `bun:",pk,type:uuid" json:"id"`
 	DisplayName       string          `bun:"display_name,notnull" json:"displayName"`
 	Email             string          `bun:"email,unique,notnull" json:"email"`
-	Password          string    `bun:"password,notnull" json:"-"`
+	Password          password.Hashed `bun:"password,notnull" json:"-"`
 	StorageUsageBytes int64           `bun:"storage_usage_bytes,notnull" json:"storageUsageBytes"`
 	StorageQuotaBytes int64           `bun:"storage_quota_bytes,notnull" json:"storageQuotaBytes"`
 }