discrete user accounts

backend-go/internal/models/user.go

@@ -0,0 +1,53 @@
+package models
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/kjannette/koin-ping/backend-go/internal/domain"
+)
+
+type UserModel struct {
+	pool *pgxpool.Pool
+}
+
+func NewUserModel(pool *pgxpool.Pool) *UserModel {
+	return &UserModel{pool: pool}
+}
+
+// FindOrCreateByFirebaseUID returns the local user for a Firebase UID,
+// creating one if it doesn't exist yet. On conflict (returning user) the
+// updated_at timestamp is refreshed.
+func (m *UserModel) FindOrCreateByFirebaseUID(ctx context.Context, firebaseUID, email string) (*domain.User, error) {
+	var u domain.User
+	err := m.pool.QueryRow(ctx,
+		`INSERT INTO users (firebase_uid, email)
+		 VALUES ($1, $2)
+		 ON CONFLICT (firebase_uid) DO UPDATE SET updated_at = NOW()
+		 RETURNING id, firebase_uid, email, display_name, created_at, updated_at`,
+		firebaseUID, email,
+	).Scan(&u.ID, &u.FirebaseUID, &u.Email, &u.DisplayName, &u.CreatedAt, &u.UpdatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (m *UserModel) GetByID(ctx context.Context, id string) (*domain.User, error) {
+	var u domain.User
+	err := m.pool.QueryRow(ctx,
+		`SELECT id, firebase_uid, email, display_name, created_at, updated_at
+		 FROM users
+		 WHERE id = $1`,
+		id,
+	).Scan(&u.ID, &u.FirebaseUID, &u.Email, &u.DisplayName, &u.CreatedAt, &u.UpdatedAt)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return &u, nil
+}