Initial commit

cmd/cli/application.go

@@ -0,0 +1,663 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"crypto/rand"
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"slices"
+	"strings"
+	"text/tabwriter"
+	"time"
+
+	"gardomatic.kleiax.de/internal/auth"
+	"gardomatic.kleiax.de/internal/mailer"
+	"gardomatic.kleiax.de/internal/platform/validate"
+	"gardomatic.kleiax.de/internal/storage"
+	"gardomatic.kleiax.de/internal/vcs"
+	"golang.org/x/term"
+)
+
+const activationTokenTTL = 3 * 24 * time.Hour
+
+type application struct {
+	stdin     io.Reader
+	stdout    io.Writer
+	stderr    io.Writer
+	openStore func(string) (adminStore, error)
+	newMailer func(mailer.Config) (*mailer.Mailer, error)
+}
+
+func newApplication(stdin io.Reader, stdout, stderr io.Writer) *application {
+	return &application{
+		stdin:     stdin,
+		stdout:    stdout,
+		stderr:    stderr,
+		openStore: openPostgresStore,
+		newMailer: mailer.New,
+	}
+}
+
+func (app *application) run(ctx context.Context, args []string) error {
+	cfg, err := configFromEnvironment()
+	if err != nil {
+		return err
+	}
+
+	global := flag.NewFlagSet("gardomatic", flag.ContinueOnError)
+	global.SetOutput(app.stderr)
+	global.StringVar(&cfg.dsn, "dsn", cfg.dsn, "PostgreSQL DSN (default: GARDOMATIC_DB_DSN)")
+	global.StringVar(&cfg.environment, "env", cfg.environment, "environment name")
+	global.StringVar(&cfg.webBaseURL, "web-base-url", cfg.webBaseURL, "public web base URL")
+	global.BoolVar(&cfg.json, "json", false, "write JSON output")
+	global.BoolVar(&cfg.yes, "yes", false, "skip production confirmation")
+	global.Usage = func() { app.printUsage(global) }
+	if err = global.Parse(args); err != nil {
+		return err
+	}
+
+	remaining := global.Args()
+	if len(remaining) == 0 {
+		global.Usage()
+		return nil
+	}
+	if remaining[0] == "help" || remaining[0] == "--help" || remaining[0] == "-h" {
+		global.Usage()
+		return nil
+	}
+	if slices.Contains(remaining[1:], "--help") || slices.Contains(remaining[1:], "-h") {
+		global.Usage()
+		return nil
+	}
+	if remaining[0] == "version" {
+		return app.writeValue(cfg, map[string]string{"version": vcs.Version()}, "Version: %s\n", vcs.Version())
+	}
+
+	store, err := app.openStore(cfg.dsn)
+	if err != nil {
+		return err
+	}
+	defer store.Close()
+
+	switch remaining[0] {
+	case "users":
+		return app.runUsers(ctx, cfg, store, remaining[1:])
+	case "gardens":
+		return app.runGardens(ctx, cfg, store, remaining[1:])
+	case "db":
+		return app.runDB(ctx, cfg, store, remaining[1:])
+	default:
+		return fmt.Errorf("unknown command %q; run gardomatic help", remaining[0])
+	}
+}
+
+func (app *application) runUsers(ctx context.Context, cfg config, store adminStore, args []string) error {
+	if len(args) == 0 {
+		return errors.New("missing users command: create, list, show, activate, deactivate, invite, reset-password, or set-role")
+	}
+	switch args[0] {
+	case "create":
+		return app.createUser(ctx, cfg, store, args[1:])
+	case "list":
+		return app.listUsers(ctx, cfg, store, args[1:])
+	case "show":
+		return app.showUser(ctx, cfg, store, args[1:])
+	case "activate":
+		return app.setUserActivated(ctx, cfg, store, args[1:], true)
+	case "deactivate":
+		return app.setUserActivated(ctx, cfg, store, args[1:], false)
+	case "invite":
+		return app.inviteUser(ctx, cfg, store, args[1:])
+	case "reset-password":
+		return app.resetPassword(ctx, cfg, store, args[1:])
+	case "set-role":
+		return app.setUserRole(ctx, cfg, store, args[1:])
+	default:
+		return fmt.Errorf("unknown users command %q", args[0])
+	}
+}
+
+func (app *application) runGardens(ctx context.Context, cfg config, store adminStore, args []string) error {
+	if len(args) == 0 {
+		return errors.New("missing gardens command: add-user")
+	}
+	if args[0] != "add-user" {
+		return fmt.Errorf("unknown gardens command %q", args[0])
+	}
+	return app.addGardenMember(ctx, cfg, store, args[1:])
+}
+
+func (app *application) setUserRole(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users set-role", app.stderr)
+	var email, role string
+	fs.StringVar(&email, "email", "", "email address (required)")
+	fs.StringVar(&role, "role", "", "application role (required)")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	email, role = strings.TrimSpace(email), strings.TrimSpace(role)
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	if role != string(storage.ApplicationRoleUser) && role != string(storage.ApplicationRoleAdmin) {
+		return errors.New("role must be application:user or application:admin")
+	}
+	user, err := store.SetUserRole(ctx, email, role)
+	if err != nil {
+		return userError(email, err)
+	}
+	return app.writeUser(cfg, user)
+}
+
+func (app *application) addGardenMember(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("gardens add-user", app.stderr)
+	var gardenID int
+	var email, role string
+	fs.IntVar(&gardenID, "garden-id", 0, "garden ID (required)")
+	fs.StringVar(&email, "email", "", "email address (required)")
+	fs.StringVar(&role, "role", string(storage.GardenRoleMember), "garden role")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	email, role = strings.TrimSpace(email), strings.TrimSpace(role)
+	if gardenID < 1 {
+		return errors.New("garden-id must be a positive integer")
+	}
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	validRole := role == string(storage.GardenRoleOwner) || role == string(storage.GardenRoleAdmin) || role == string(storage.GardenRoleMember) || role == string(storage.GardenRoleViewer) || role == string(storage.GardenRoleWorker)
+	if !validRole {
+		return errors.New("role must be owner, admin, member, viewer, or worker")
+	}
+	member, err := store.AddGardenMember(ctx, gardenID, email, role)
+	if err != nil {
+		if errors.Is(err, storage.ErrRecordNotFound) {
+			return fmt.Errorf("garden %d, user %s, or role %s was not found", gardenID, email, role)
+		}
+		return err
+	}
+	if cfg.json {
+		return writeJSON(app.stdout, member)
+	}
+	_, err = fmt.Fprintf(app.stdout, "User: %s\nGarden: %d\nRole: %s\n", member.Email, member.GardenID, member.Role)
+	return err
+}
+
+func (app *application) createUser(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users create", app.stderr)
+	var name, email, role string
+	var active, invite, generatePassword, passwordStdin, sendEmail bool
+	fs.StringVar(&name, "name", "", "display name (required)")
+	fs.StringVar(&email, "email", "", "email address (required)")
+	fs.StringVar(&role, "role", string(storage.ApplicationRoleUser), "application role")
+	fs.BoolVar(&active, "active", false, "create an activated account")
+	fs.BoolVar(&invite, "invite", false, "create an activation token")
+	fs.BoolVar(&generatePassword, "generate-password", false, "generate a secure password")
+	fs.BoolVar(&passwordStdin, "password-stdin", false, "read the password from standard input")
+	fs.BoolVar(&sendEmail, "send-email", false, "send the invitation using configured mail settings")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	name = strings.TrimSpace(name)
+	email = strings.TrimSpace(email)
+	role = strings.TrimSpace(role)
+	if active == invite {
+		return errors.New("exactly one of --active or --invite is required")
+	}
+	if sendEmail && !invite {
+		return errors.New("--send-email requires --invite")
+	}
+	if generatePassword && passwordStdin {
+		return errors.New("--generate-password and --password-stdin are mutually exclusive")
+	}
+	if err := validateIdentity(name, email); err != nil {
+		return err
+	}
+	if role != string(storage.ApplicationRoleUser) && role != string(storage.ApplicationRoleAdmin) {
+		return errors.New("role must be application:user or application:admin")
+	}
+	password, generated, err := app.obtainPassword(generatePassword, passwordStdin)
+	if err != nil {
+		return err
+	}
+	passwordHash, err := hashPassword(password)
+	if err != nil {
+		return err
+	}
+
+	result, err := store.CreateUser(ctx, createUserInput{
+		Name:         name,
+		Email:        email,
+		PasswordHash: passwordHash,
+		Activated:    active,
+		Role:         role,
+		Invite:       invite,
+		TokenTTL:     activationTokenTTL,
+	})
+	if err != nil {
+		if errors.Is(err, storage.ErrDuplicateEmail) {
+			return fmt.Errorf("a user with email %s already exists", email)
+		}
+		return err
+	}
+
+	output := userMutationOutput{User: result.User}
+	if generated {
+		output.GeneratedPassword = password
+	}
+	if result.Token != nil {
+		output.ActivationToken = result.Token.Plaintext
+		output.ActivationURL, err = activationURL(cfg.webBaseURL, result.Token.Plaintext)
+		if err != nil {
+			return err
+		}
+		output.TokenExpiry = &result.Token.Expiry
+		if sendEmail {
+			if err = app.sendInvitation(cfg, result.User, *result.Token, output.ActivationURL, true); err != nil {
+				return fmt.Errorf("user was created, but sending invitation failed: %w", err)
+			}
+			output.EmailSent = true
+		}
+	}
+	return app.writeUserMutation(cfg, output)
+}
+
+func (app *application) listUsers(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users list", app.stderr)
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	users, err := store.ListUsers(ctx)
+	if err != nil {
+		return err
+	}
+	if cfg.json {
+		return writeJSON(app.stdout, users)
+	}
+	tw := tabwriter.NewWriter(app.stdout, 0, 4, 2, ' ', 0)
+	fmt.Fprintln(tw, "ID\tNAME\tEMAIL\tACTIVE\tROLE\tCREATED")
+	for _, user := range users {
+		fmt.Fprintf(tw, "%d\t%s\t%s\t%t\t%s\t%s\n", user.ID, user.Name, user.Email, user.Activated, user.Role, user.CreatedAt.Format(time.RFC3339))
+	}
+	return tw.Flush()
+}
+
+func (app *application) showUser(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users show", app.stderr)
+	var email string
+	fs.StringVar(&email, "email", "", "email address (required)")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	user, err := store.GetUser(ctx, strings.TrimSpace(email))
+	if err != nil {
+		return userError(email, err)
+	}
+	return app.writeUser(cfg, user)
+}
+
+func (app *application) setUserActivated(ctx context.Context, cfg config, store adminStore, args []string, active bool) error {
+	command := "activate"
+	if !active {
+		command = "deactivate"
+	}
+	fs := newFlagSet("users "+command, app.stderr)
+	var email string
+	fs.StringVar(&email, "email", "", "email address (required)")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	email = strings.TrimSpace(email)
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	if !active {
+		if err := app.confirmProduction(cfg, "deactivate user "+email); err != nil {
+			return err
+		}
+	}
+	user, err := store.SetActivated(ctx, email, active)
+	if err != nil {
+		return userError(email, err)
+	}
+	return app.writeUser(cfg, user)
+}
+
+func (app *application) inviteUser(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users invite", app.stderr)
+	var email string
+	var sendEmail bool
+	fs.StringVar(&email, "email", "", "email address (required)")
+	fs.BoolVar(&sendEmail, "send-email", false, "send the invitation using configured mail settings")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	email = strings.TrimSpace(email)
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	user, token, err := store.IssueInvitation(ctx, email, activationTokenTTL)
+	if err != nil {
+		return userError(email, err)
+	}
+	link, err := activationURL(cfg.webBaseURL, token.Plaintext)
+	if err != nil {
+		return err
+	}
+	output := userMutationOutput{
+		User:            user,
+		ActivationToken: token.Plaintext,
+		ActivationURL:   link,
+		TokenExpiry:     &token.Expiry,
+	}
+	if sendEmail {
+		if err = app.sendInvitation(cfg, user, token, link, false); err != nil {
+			return fmt.Errorf("invitation token was created, but sending email failed: %w", err)
+		}
+		output.EmailSent = true
+	}
+	return app.writeUserMutation(cfg, output)
+}
+
+func (app *application) resetPassword(ctx context.Context, cfg config, store adminStore, args []string) error {
+	fs := newFlagSet("users reset-password", app.stderr)
+	var email string
+	var generatePassword, passwordStdin bool
+	fs.StringVar(&email, "email", "", "email address (required)")
+	fs.BoolVar(&generatePassword, "generate-password", false, "generate a secure password")
+	fs.BoolVar(&passwordStdin, "password-stdin", false, "read the password from standard input")
+	if err := parseFlags(fs, args); err != nil {
+		return err
+	}
+	email = strings.TrimSpace(email)
+	if err := validateEmail(email); err != nil {
+		return err
+	}
+	if generatePassword && passwordStdin {
+		return errors.New("--generate-password and --password-stdin are mutually exclusive")
+	}
+	if err := app.confirmProduction(cfg, "reset password for "+email); err != nil {
+		return err
+	}
+	password, generated, err := app.obtainPassword(generatePassword, passwordStdin)
+	if err != nil {
+		return err
+	}
+	hash, err := hashPassword(password)
+	if err != nil {
+		return err
+	}
+	user, err := store.ResetPassword(ctx, email, hash)
+	if err != nil {
+		return userError(email, err)
+	}
+	output := userMutationOutput{User: user}
+	if generated {
+		output.GeneratedPassword = password
+	}
+	return app.writeUserMutation(cfg, output)
+}
+
+func (app *application) runDB(ctx context.Context, cfg config, store adminStore, args []string) error {
+	if len(args) != 1 || args[0] != "ping" {
+		return errors.New("usage: gardomatic db ping")
+	}
+	if err := store.Ping(ctx); err != nil {
+		return err
+	}
+	return app.writeValue(cfg, map[string]string{"status": "ok"}, "database: ok\n")
+}
+
+type userMutationOutput struct {
+	User              userView   `json:"user"`
+	ActivationToken   string     `json:"activation_token,omitempty"`
+	ActivationURL     string     `json:"activation_url,omitempty"`
+	TokenExpiry       *time.Time `json:"token_expiry,omitempty"`
+	GeneratedPassword string     `json:"generated_password,omitempty"`
+	EmailSent         bool       `json:"email_sent,omitempty"`
+}
+
+func (app *application) writeUserMutation(cfg config, output userMutationOutput) error {
+	if cfg.json {
+		return writeJSON(app.stdout, output)
+	}
+	if err := app.writeUser(cfg, output.User); err != nil {
+		return err
+	}
+	if output.GeneratedPassword != "" {
+		fmt.Fprintf(app.stdout, "Generated password: %s\n", output.GeneratedPassword)
+	}
+	if output.ActivationToken != "" {
+		fmt.Fprintf(app.stdout, "Activation token: %s\n", output.ActivationToken)
+		fmt.Fprintf(app.stdout, "Activation URL: %s\n", output.ActivationURL)
+		fmt.Fprintf(app.stdout, "Token expires: %s\n", output.TokenExpiry.Format(time.RFC3339))
+	}
+	if output.EmailSent {
+		fmt.Fprintln(app.stdout, "Invitation email sent.")
+	}
+	return nil
+}
+
+func (app *application) writeUser(cfg config, user userView) error {
+	if cfg.json {
+		return writeJSON(app.stdout, user)
+	}
+	tw := tabwriter.NewWriter(app.stdout, 0, 4, 2, ' ', 0)
+	fmt.Fprintf(tw, "ID:\t%d\n", user.ID)
+	fmt.Fprintf(tw, "Name:\t%s\n", user.Name)
+	fmt.Fprintf(tw, "Email:\t%s\n", user.Email)
+	fmt.Fprintf(tw, "Active:\t%t\n", user.Activated)
+	fmt.Fprintf(tw, "Role:\t%s\n", user.Role)
+	return tw.Flush()
+}
+
+func (app *application) writeValue(cfg config, value any, format string, args ...any) error {
+	if cfg.json {
+		return writeJSON(app.stdout, value)
+	}
+	_, err := fmt.Fprintf(app.stdout, format, args...)
+	return err
+}
+
+func (app *application) obtainPassword(generate, fromStdin bool) (string, bool, error) {
+	if generate {
+		return rand.Text(), true, nil
+	}
+	if fromStdin {
+		password, err := bufio.NewReader(app.stdin).ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			return "", false, err
+		}
+		password = strings.TrimRight(password, "\r\n")
+		if err = validatePassword(password); err != nil {
+			return "", false, err
+		}
+		return password, false, nil
+	}
+
+	input, ok := app.stdin.(*os.File)
+	if !ok || !term.IsTerminal(int(input.Fd())) {
+		return "", false, errors.New("standard input is not a terminal; use --password-stdin or --generate-password")
+	}
+	fmt.Fprint(app.stderr, "Password: ")
+	first, err := term.ReadPassword(int(input.Fd()))
+	fmt.Fprintln(app.stderr)
+	if err != nil {
+		return "", false, err
+	}
+	fmt.Fprint(app.stderr, "Repeat password: ")
+	second, err := term.ReadPassword(int(input.Fd()))
+	fmt.Fprintln(app.stderr)
+	if err != nil {
+		return "", false, err
+	}
+	if string(first) != string(second) {
+		return "", false, errors.New("passwords do not match")
+	}
+	if err = validatePassword(string(first)); err != nil {
+		return "", false, err
+	}
+	return string(first), false, nil
+}
+
+func (app *application) confirmProduction(cfg config, action string) error {
+	if !strings.EqualFold(cfg.environment, "production") || cfg.yes {
+		return nil
+	}
+	fmt.Fprintf(app.stderr, "Production: %s. Continue? [y/N] ", action)
+	answer, err := bufio.NewReader(app.stdin).ReadString('\n')
+	if err != nil && !errors.Is(err, io.EOF) {
+		return err
+	}
+	if strings.ToLower(strings.TrimSpace(answer)) != "y" {
+		return errors.New("operation cancelled")
+	}
+	return nil
+}
+
+func (app *application) sendInvitation(cfg config, user userView, token auth.Token, link string, welcome bool) error {
+	m, err := app.newMailer(cfg.mail)
+	if err != nil {
+		return err
+	}
+	template := "token_activation.tmpl"
+	if welcome {
+		template = "user_welcome.tmpl"
+	}
+	return m.Send(user.Email, template, map[string]any{
+		"activationToken": token.Plaintext,
+		"activationURL":   link,
+		"userID":          user.ID,
+	})
+}
+
+func (app *application) printUsage(fs *flag.FlagSet) {
+	fmt.Fprintln(app.stderr, `Gardomatic administration CLI
+
+Usage:
+  gardomatic [global options] users create --name NAME --email EMAIL (--active|--invite) [--role ROLE] [options]
+  gardomatic [global options] users list
+  gardomatic [global options] users show --email EMAIL
+  gardomatic [global options] users activate|deactivate --email EMAIL
+  gardomatic [global options] users invite --email EMAIL [--send-email]
+  gardomatic [global options] users reset-password --email EMAIL [options]
+  gardomatic [global options] users set-role --email EMAIL --role ROLE
+  gardomatic [global options] gardens add-user --garden-id ID --email EMAIL [--role ROLE]
+  gardomatic [global options] db ping
+  gardomatic [global options] version
+
+Global options:`)
+	fs.PrintDefaults()
+}
+
+func activationURL(baseURL, token string) (string, error) {
+	u, err := url.Parse(strings.TrimRight(baseURL, "/") + "/activate")
+	if err != nil {
+		return "", fmt.Errorf("invalid web base URL: %w", err)
+	}
+	if u.Scheme == "" || u.Host == "" {
+		return "", errors.New("web base URL must include scheme and host")
+	}
+	query := u.Query()
+	query.Set("token", token)
+	u.RawQuery = query.Encode()
+	return u.String(), nil
+}
+
+func validateIdentity(name, email string) error {
+	password := auth.NewPassword([]byte("placeholder"))
+	user := storage.User{Name: name, Email: email, Password: *password}
+	v := validate.New()
+	storage.ValidateUser(v, user)
+	delete(v.Errors, "password")
+	if !v.Valid() {
+		return validationError(v.Errors)
+	}
+	return nil
+}
+
+func validateEmail(email string) error {
+	v := validate.New()
+	storage.ValidateEmail(v, strings.TrimSpace(email))
+	if !v.Valid() {
+		return validationError(v.Errors)
+	}
+	return nil
+}
+
+func validatePassword(password string) error {
+	v := validate.New()
+	auth.ValidatePasswordPlaintext(v, password)
+	if !v.Valid() {
+		return validationError(v.Errors)
+	}
+	return nil
+}
+
+func hashPassword(plaintext string) ([]byte, error) {
+	if err := validatePassword(plaintext); err != nil {
+		return nil, err
+	}
+	var password auth.Password
+	if err := password.Set(plaintext); err != nil {
+		return nil, err
+	}
+	return password.Get(), nil
+}
+
+func validationError(fields map[string]string) error {
+	keys := make([]string, 0, len(fields))
+	for key := range fields {
+		keys = append(keys, key)
+	}
+	slices.Sort(keys)
+	parts := make([]string, 0, len(keys))
+	for _, key := range keys {
+		parts = append(parts, key+" "+fields[key])
+	}
+	return errors.New(strings.Join(parts, "; "))
+}
+
+func userError(email string, err error) error {
+	switch {
+	case errors.Is(err, errUserNotFound):
+		return fmt.Errorf("no user found with email %s", email)
+	case errors.Is(err, errUserAlreadyActive):
+		return fmt.Errorf("user %s is already active", email)
+	default:
+		return err
+	}
+}
+
+func newFlagSet(name string, output io.Writer) *flag.FlagSet {
+	fs := flag.NewFlagSet(name, flag.ContinueOnError)
+	fs.SetOutput(output)
+	return fs
+}
+
+func parseFlags(fs *flag.FlagSet, args []string) error {
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+	if fs.NArg() != 0 {
+		return fmt.Errorf("unexpected argument %q", fs.Arg(0))
+	}
+	return nil
+}
+
+func writeJSON(w io.Writer, value any) error {
+	encoder := json.NewEncoder(w)
+	encoder.SetIndent("", "  ")
+	encoder.SetEscapeHTML(false)
+	return encoder.Encode(value)
+}

cmd/cli/application_test.go

@@ -0,0 +1,272 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"gardomatic.kleiax.de/internal/auth"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type fakeAdminStore struct {
+	createInput       createUserInput
+	createCalls       int
+	setActivatedCalls int
+	inviteCalls       int
+	setRoleCalls      int
+	addMemberCalls    int
+	lastRole          string
+}
+
+func (s *fakeAdminStore) Ping(context.Context) error { return nil }
+func (s *fakeAdminStore) Close() error               { return nil }
+
+func (s *fakeAdminStore) CreateUser(_ context.Context, input createUserInput) (createUserResult, error) {
+	s.createCalls++
+	s.createInput = input
+	result := createUserResult{User: userView{
+		ID:        42,
+		Name:      input.Name,
+		Email:     input.Email,
+		Activated: input.Activated,
+		Role:      input.Role,
+		CreatedAt: time.Date(2026, time.August, 31, 10, 0, 0, 0, time.UTC),
+		UpdatedAt: time.Date(2026, time.August, 31, 10, 0, 0, 0, time.UTC),
+	}}
+	if input.Invite {
+		token := auth.NewToken(42, input.TokenTTL, auth.ScopeActivation)
+		result.Token = &token
+	}
+	return result, nil
+}
+
+func (s *fakeAdminStore) ListUsers(context.Context) ([]userView, error) { return nil, nil }
+func (s *fakeAdminStore) GetUser(context.Context, string) (userView, error) {
+	return userView{}, errUserNotFound
+}
+func (s *fakeAdminStore) SetActivated(_ context.Context, email string, active bool) (userView, error) {
+	s.setActivatedCalls++
+	return userView{ID: 42, Email: email, Activated: active}, nil
+}
+func (s *fakeAdminStore) IssueInvitation(_ context.Context, email string, ttl time.Duration) (userView, auth.Token, error) {
+	s.inviteCalls++
+	return userView{ID: 42, Name: "Alice", Email: email}, auth.NewToken(42, ttl, auth.ScopeActivation), nil
+}
+func (s *fakeAdminStore) ResetPassword(context.Context, string, []byte) (userView, error) {
+	return userView{}, nil
+}
+func (s *fakeAdminStore) SetUserRole(_ context.Context, email, role string) (userView, error) {
+	s.setRoleCalls++
+	s.lastRole = role
+	return userView{ID: 42, Email: email, Role: role}, nil
+}
+func (s *fakeAdminStore) AddGardenMember(_ context.Context, gardenID int, email, role string) (gardenMemberView, error) {
+	s.addMemberCalls++
+	s.lastRole = role
+	return gardenMemberView{GardenID: gardenID, UserID: 42, Email: email, Role: role}, nil
+}
+
+func newTestApplication(t *testing.T, stdin string, store adminStore) (*application, *bytes.Buffer, *bytes.Buffer) {
+	t.Helper()
+	t.Setenv("GARDOMATIC_DB_DSN", "postgres://unused")
+	t.Setenv("GARDOMATIC_ENV", "development")
+	stdout := new(bytes.Buffer)
+	stderr := new(bytes.Buffer)
+	app := newApplication(strings.NewReader(stdin), stdout, stderr)
+	app.openStore = func(string) (adminStore, error) { return store, nil }
+	return app, stdout, stderr
+}
+
+func TestCreateInvitedUserGeneratesCredentialsAndJSON(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, stdout, _ := newTestApplication(t, "", store)
+
+	err := app.run(context.Background(), []string{
+		"--json",
+		"--web-base-url", "https://gardomatic.example/app",
+		"users", "create",
+		"--name", " Alice ",
+		"--email", "alice@example.com",
+		"--invite",
+		"--generate-password",
+	})
+	if err != nil {
+		t.Fatalf("run() returned an error: %v", err)
+	}
+	if store.createCalls != 1 {
+		t.Fatalf("CreateUser calls = %d, want 1", store.createCalls)
+	}
+	if store.createInput.Name != "Alice" || !store.createInput.Invite || store.createInput.Activated {
+		t.Errorf("CreateUser input = %+v", store.createInput)
+	}
+
+	var output userMutationOutput
+	if err = json.Unmarshal(stdout.Bytes(), &output); err != nil {
+		t.Fatalf("decoding output: %v; output: %s", err, stdout.String())
+	}
+	if output.GeneratedPassword == "" {
+		t.Fatal("generated password is missing")
+	}
+	if err = bcrypt.CompareHashAndPassword(store.createInput.PasswordHash, []byte(output.GeneratedPassword)); err != nil {
+		t.Errorf("stored password hash does not match generated password: %v", err)
+	}
+	if !strings.HasPrefix(output.ActivationURL, "https://gardomatic.example/app/activate?token=") {
+		t.Errorf("activation URL = %q", output.ActivationURL)
+	}
+	if output.ActivationToken == "" || !strings.Contains(output.ActivationURL, output.ActivationToken) {
+		t.Errorf("activation token and URL do not match: %+v", output)
+	}
+}
+
+func TestCreateUserRequiresExactlyOneAccountMode(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, _, _ := newTestApplication(t, "", store)
+
+	err := app.run(context.Background(), []string{
+		"users", "create",
+		"--name", "Alice",
+		"--email", "alice@example.com",
+		"--generate-password",
+	})
+	if err == nil || !strings.Contains(err.Error(), "exactly one") {
+		t.Fatalf("run() error = %v, want account mode error", err)
+	}
+	if store.createCalls != 0 {
+		t.Errorf("CreateUser calls = %d, want 0", store.createCalls)
+	}
+}
+
+func TestCreateUserCanAtomicallyCreateApplicationAdmin(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, stdout, _ := newTestApplication(t, "", store)
+
+	err := app.run(context.Background(), []string{
+		"users", "create",
+		"--name", "Initial Admin",
+		"--email", "admin@example.com",
+		"--role", "application:admin",
+		"--active",
+		"--generate-password",
+	})
+	if err != nil {
+		t.Fatalf("run() returned an error: %v", err)
+	}
+	if store.createInput.Role != "application:admin" {
+		t.Fatalf("created role = %q, want application:admin", store.createInput.Role)
+	}
+	if !strings.Contains(stdout.String(), "application:admin") {
+		t.Fatalf("output does not contain admin role: %s", stdout.String())
+	}
+}
+
+func TestCreateUserRejectsUnknownApplicationRole(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, _, _ := newTestApplication(t, "", store)
+	err := app.run(context.Background(), []string{
+		"users", "create",
+		"--name", "Alice",
+		"--email", "alice@example.com",
+		"--role", "superadmin",
+		"--active",
+		"--generate-password",
+	})
+	if err == nil || !strings.Contains(err.Error(), "role must be") {
+		t.Fatalf("run() error = %v, want role validation error", err)
+	}
+	if store.createCalls != 0 {
+		t.Fatalf("CreateUser calls = %d, want 0", store.createCalls)
+	}
+}
+
+func TestProductionDeactivationRequiresConfirmation(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, _, _ := newTestApplication(t, "n\n", store)
+
+	err := app.run(context.Background(), []string{
+		"--env", "production",
+		"users", "deactivate", "--email", "alice@example.com",
+	})
+	if err == nil || err.Error() != "operation cancelled" {
+		t.Fatalf("run() error = %v, want operation cancelled", err)
+	}
+	if store.setActivatedCalls != 0 {
+		t.Errorf("SetActivated calls = %d, want 0", store.setActivatedCalls)
+	}
+}
+
+func TestInviteCanWriteEmailWithActivationLink(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, _, _ := newTestApplication(t, "", store)
+	mailPath := filepath.Join(t.TempDir(), "mail.log")
+	t.Setenv("GARDOMATIC_SMTP_MODE", "file")
+	t.Setenv("GARDOMATIC_SMTP_FILE_PATH", mailPath)
+
+	err := app.run(context.Background(), []string{
+		"--web-base-url", "https://gardomatic.example",
+		"users", "invite", "--email", "alice@example.com", "--send-email",
+	})
+	if err != nil {
+		t.Fatalf("run() returned an error: %v", err)
+	}
+	content, err := os.ReadFile(mailPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(string(content), "https://gardomatic.example/activate?token=") {
+		t.Errorf("mail does not contain activation URL: %s", content)
+	}
+}
+
+func TestActivationURLRejectsRelativeBase(t *testing.T) {
+	_, err := activationURL("localhost:4040", "token")
+	if err == nil {
+		t.Fatal("activationURL() returned no error")
+	}
+}
+
+func TestSetUserRoleCanMakeApplicationAdmin(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, stdout, _ := newTestApplication(t, "", store)
+	err := app.run(context.Background(), []string{"users", "set-role", "--email", "alice@example.com", "--role", "application:admin"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if store.setRoleCalls != 1 || store.lastRole != "application:admin" || !strings.Contains(stdout.String(), "application:admin") {
+		t.Fatalf("role update missing: calls=%d role=%q output=%q", store.setRoleCalls, store.lastRole, stdout.String())
+	}
+}
+
+func TestAddUserToGardenWithAdminRole(t *testing.T) {
+	store := new(fakeAdminStore)
+	app, stdout, _ := newTestApplication(t, "", store)
+	err := app.run(context.Background(), []string{"gardens", "add-user", "--garden-id", "7", "--email", "alice@example.com", "--role", "admin"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if store.addMemberCalls != 1 || store.lastRole != "admin" || !strings.Contains(stdout.String(), "Garden: 7") {
+		t.Fatalf("garden membership missing: calls=%d role=%q output=%q", store.addMemberCalls, store.lastRole, stdout.String())
+	}
+}
+
+func TestRoleCommandsRejectUnknownRoles(t *testing.T) {
+	tests := [][]string{
+		{"users", "set-role", "--email", "alice@example.com", "--role", "superadmin"},
+		{"gardens", "add-user", "--garden-id", "7", "--email", "alice@example.com", "--role", "superadmin"},
+	}
+	for _, args := range tests {
+		store := new(fakeAdminStore)
+		app, _, _ := newTestApplication(t, "", store)
+		if err := app.run(context.Background(), args); err == nil || !strings.Contains(err.Error(), "role must be") {
+			t.Errorf("run(%v) error = %v, want role validation error", args, err)
+		}
+		if store.setRoleCalls != 0 || store.addMemberCalls != 0 {
+			t.Errorf("run(%v) reached store", args)
+		}
+	}
+}

cmd/cli/config.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"gardomatic.kleiax.de/internal/mailer"
+)
+
+type config struct {
+	dsn         string
+	environment string
+	webBaseURL  string
+	json        bool
+	yes         bool
+	mail        mailer.Config
+}
+
+func configFromEnvironment() (config, error) {
+	port, err := envInt("GARDOMATIC_SMTP_PORT", 25)
+	if err != nil {
+		return config{}, err
+	}
+
+	return config{
+		dsn:         os.Getenv("GARDOMATIC_DB_DSN"),
+		environment: envString("GARDOMATIC_ENV", "development"),
+		webBaseURL:  envString("GARDOMATIC_WEB_BASE_URL", "http://localhost:4040"),
+		mail: mailer.Config{
+			Mode:     mailer.Mode(envString("GARDOMATIC_SMTP_MODE", string(mailer.ModeFile))),
+			Host:     os.Getenv("GARDOMATIC_SMTP_HOST"),
+			Port:     port,
+			Username: os.Getenv("GARDOMATIC_SMTP_USERNAME"),
+			Password: os.Getenv("GARDOMATIC_SMTP_PASSWORD"),
+			Sender:   envString("GARDOMATIC_SMTP_SENDER", "gardomatic@localhost"),
+			FilePath: envString("GARDOMATIC_SMTP_FILE_PATH", "/tmp/gardomatic-mails.log"),
+		},
+	}, nil
+}
+
+func envString(name, fallback string) string {
+	if value := strings.TrimSpace(os.Getenv(name)); value != "" {
+		return value
+	}
+	return fallback
+}
+
+func envInt(name string, fallback int) (int, error) {
+	value := strings.TrimSpace(os.Getenv(name))
+	if value == "" {
+		return fallback, nil
+	}
+
+	n, err := strconv.Atoi(value)
+	if err != nil {
+		return 0, fmt.Errorf("%s must be an integer: %w", name, err)
+	}
+	return n, nil
+}

cmd/cli/doc.go

@@ -0,0 +1,2 @@
+// Package main provides the Gardomatic administration command-line tool.
+package main

cmd/cli/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+)
+
+func main() {
+	app := newApplication(os.Stdin, os.Stdout, os.Stderr)
+	if err := app.run(context.Background(), os.Args[1:]); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}

cmd/cli/store.go

@@ -0,0 +1,336 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"gardomatic.kleiax.de/internal/auth"
+	"gardomatic.kleiax.de/internal/storage"
+	"github.com/lib/pq"
+)
+
+var (
+	errUserNotFound      = errors.New("user not found")
+	errUserAlreadyActive = errors.New("user is already active")
+)
+
+type userView struct {
+	ID        int       `json:"id"`
+	Name      string    `json:"name"`
+	Email     string    `json:"email"`
+	Activated bool      `json:"activated"`
+	Role      string    `json:"role"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type gardenMemberView struct {
+	GardenID int       `json:"garden_id"`
+	UserID   int       `json:"user_id"`
+	Email    string    `json:"email"`
+	Role     string    `json:"role"`
+	JoinedAt time.Time `json:"joined_at"`
+}
+
+type createUserInput struct {
+	Name         string
+	Email        string
+	PasswordHash []byte
+	Activated    bool
+	Role         string
+	Invite       bool
+	TokenTTL     time.Duration
+}
+
+type createUserResult struct {
+	User  userView
+	Token *auth.Token
+}
+
+type adminStore interface {
+	Ping(context.Context) error
+	CreateUser(context.Context, createUserInput) (createUserResult, error)
+	ListUsers(context.Context) ([]userView, error)
+	GetUser(context.Context, string) (userView, error)
+	SetActivated(context.Context, string, bool) (userView, error)
+	IssueInvitation(context.Context, string, time.Duration) (userView, auth.Token, error)
+	ResetPassword(context.Context, string, []byte) (userView, error)
+	SetUserRole(context.Context, string, string) (userView, error)
+	AddGardenMember(context.Context, int, string, string) (gardenMemberView, error)
+	Close() error
+}
+
+type postgresStore struct {
+	db *sql.DB
+}
+
+func openPostgresStore(dsn string) (adminStore, error) {
+	if dsn == "" {
+		return nil, errors.New("database DSN is missing; set GARDOMATIC_DB_DSN or use --dsn")
+	}
+	db, err := sql.Open("postgres", dsn)
+	if err != nil {
+		return nil, err
+	}
+	db.SetMaxOpenConns(5)
+	db.SetMaxIdleConns(2)
+	db.SetConnMaxIdleTime(5 * time.Minute)
+	return &postgresStore{db: db}, nil
+}
+
+// Close releases the CLI database pool.
+func (s *postgresStore) Close() error { return s.db.Close() }
+
+// Ping verifies that the CLI can reach PostgreSQL within a bounded timeout.
+func (s *postgresStore) Ping(ctx context.Context) error {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	return s.db.PingContext(ctx)
+}
+
+// CreateUser creates an account and optionally an invitation token atomically.
+func (s *postgresStore) CreateUser(ctx context.Context, input createUserInput) (createUserResult, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return createUserResult{}, err
+	}
+	defer tx.Rollback()
+
+	var result createUserResult
+	err = tx.QueryRowContext(ctx, `
+		INSERT INTO users (name, email, password_hash, activated, application_role)
+		VALUES ($1, $2, $3, $4, $5)
+		RETURNING id, name, email, activated, application_role, created_at, updated_at`,
+		input.Name, input.Email, input.PasswordHash, input.Activated, input.Role,
+	).Scan(
+		&result.User.ID,
+		&result.User.Name,
+		&result.User.Email,
+		&result.User.Activated,
+		&result.User.Role,
+		&result.User.CreatedAt,
+		&result.User.UpdatedAt,
+	)
+	if err != nil {
+		return createUserResult{}, mapPostgresError(err)
+	}
+
+	if input.Invite {
+		token := auth.NewToken(result.User.ID, input.TokenTTL, auth.ScopeActivation)
+		if _, err = tx.ExecContext(ctx, `
+			INSERT INTO tokens (hash, user_id, expiry, scope)
+			VALUES ($1, $2, $3, $4)`, token.Hash, token.UserID, token.Expiry, token.Scope); err != nil {
+			return createUserResult{}, err
+		}
+		result.Token = &token
+	}
+
+	if err = tx.Commit(); err != nil {
+		return createUserResult{}, err
+	}
+	return result, nil
+}
+
+// ListUsers returns all non-deleted accounts for CLI administration.
+func (s *postgresStore) ListUsers(ctx context.Context) ([]userView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	rows, err := s.db.QueryContext(ctx, `
+		SELECT id, name, email, activated, application_role, created_at, updated_at
+		FROM users
+		WHERE deleted_at IS NULL
+		ORDER BY id`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	users := make([]userView, 0)
+	for rows.Next() {
+		var user userView
+		if err = rows.Scan(&user.ID, &user.Name, &user.Email, &user.Activated, &user.Role, &user.CreatedAt, &user.UpdatedAt); err != nil {
+			return nil, err
+		}
+		users = append(users, user)
+	}
+	return users, rows.Err()
+}
+
+// GetUser returns a non-deleted account by email.
+func (s *postgresStore) GetUser(ctx context.Context, email string) (userView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	return getUser(ctx, s.db, email)
+}
+
+// SetActivated changes whether an account may authenticate.
+func (s *postgresStore) SetActivated(ctx context.Context, email string, activated bool) (userView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return userView{}, err
+	}
+	defer tx.Rollback()
+
+	var user userView
+	err = tx.QueryRowContext(ctx, `
+		UPDATE users
+		SET activated = $2, updated_at = CURRENT_TIMESTAMP, version = version + 1
+		WHERE email = $1 AND deleted_at IS NULL
+		RETURNING id, name, email, activated, application_role, created_at, updated_at`, email, activated,
+	).Scan(&user.ID, &user.Name, &user.Email, &user.Activated, &user.Role, &user.CreatedAt, &user.UpdatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return userView{}, errUserNotFound
+	}
+	if err != nil {
+		return userView{}, err
+	}
+	if activated {
+		if _, err = tx.ExecContext(ctx, `DELETE FROM tokens WHERE user_id = $1 AND scope = $2`, user.ID, auth.ScopeActivation); err != nil {
+			return userView{}, err
+		}
+	}
+	if err = tx.Commit(); err != nil {
+		return userView{}, err
+	}
+	return user, nil
+}
+
+// IssueInvitation replaces an account's activation token.
+func (s *postgresStore) IssueInvitation(ctx context.Context, email string, ttl time.Duration) (userView, auth.Token, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return userView{}, auth.Token{}, err
+	}
+	defer tx.Rollback()
+
+	user, err := getUser(ctx, tx, email)
+	if err != nil {
+		return userView{}, auth.Token{}, err
+	}
+	if user.Activated {
+		return userView{}, auth.Token{}, errUserAlreadyActive
+	}
+	if _, err = tx.ExecContext(ctx, `DELETE FROM tokens WHERE user_id = $1 AND scope = $2`, user.ID, auth.ScopeActivation); err != nil {
+		return userView{}, auth.Token{}, err
+	}
+	token := auth.NewToken(user.ID, ttl, auth.ScopeActivation)
+	if _, err = tx.ExecContext(ctx, `
+		INSERT INTO tokens (hash, user_id, expiry, scope)
+		VALUES ($1, $2, $3, $4)`, token.Hash, token.UserID, token.Expiry, token.Scope); err != nil {
+		return userView{}, auth.Token{}, err
+	}
+	if err = tx.Commit(); err != nil {
+		return userView{}, auth.Token{}, err
+	}
+	return user, token, nil
+}
+
+// ResetPassword replaces an account password hash and revokes authentication tokens.
+func (s *postgresStore) ResetPassword(ctx context.Context, email string, passwordHash []byte) (userView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return userView{}, err
+	}
+	defer tx.Rollback()
+
+	var user userView
+	err = tx.QueryRowContext(ctx, `
+		UPDATE users
+		SET password_hash = $2, updated_at = CURRENT_TIMESTAMP, version = version + 1
+		WHERE email = $1 AND deleted_at IS NULL
+		RETURNING id, name, email, activated, application_role, created_at, updated_at`, email, passwordHash,
+	).Scan(&user.ID, &user.Name, &user.Email, &user.Activated, &user.Role, &user.CreatedAt, &user.UpdatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return userView{}, errUserNotFound
+	}
+	if err != nil {
+		return userView{}, err
+	}
+	if _, err = tx.ExecContext(ctx, `
+		DELETE FROM tokens
+		WHERE user_id = $1 AND scope = ANY($2)`, user.ID, pq.Array([]string{auth.ScopeAuthentication, auth.ScopePasswordReset})); err != nil {
+		return userView{}, err
+	}
+	if err = tx.Commit(); err != nil {
+		return userView{}, err
+	}
+	return user, nil
+}
+
+// SetUserRole changes an account's application role.
+func (s *postgresStore) SetUserRole(ctx context.Context, email, role string) (userView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	var user userView
+	err := s.db.QueryRowContext(ctx, `
+		UPDATE users SET application_role=$2, updated_at=CURRENT_TIMESTAMP, version=version+1
+		WHERE email=$1 AND deleted_at IS NULL
+		RETURNING id,name,email,activated,application_role,created_at,updated_at`, email, role,
+	).Scan(&user.ID, &user.Name, &user.Email, &user.Activated, &user.Role, &user.CreatedAt, &user.UpdatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return userView{}, errUserNotFound
+	}
+	return user, err
+}
+
+// AddGardenMember adds or updates a user's membership in a garden.
+func (s *postgresStore) AddGardenMember(ctx context.Context, gardenID int, email, role string) (gardenMemberView, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	var member gardenMemberView
+	err := s.db.QueryRowContext(ctx, `
+		INSERT INTO garden_members(garden_id,user_id,role)
+		SELECT $1,u.id,$3 FROM users u
+		WHERE u.email=$2 AND u.deleted_at IS NULL
+		  AND EXISTS (SELECT 1 FROM gardens WHERE id=$1)
+		  AND EXISTS (SELECT 1 FROM roles WHERE name=$3 AND scope='garden' AND (garden_id IS NULL OR garden_id=$1))
+		RETURNING garden_id,user_id,$2,role,joined_at`, gardenID, email, role,
+	).Scan(&member.GardenID, &member.UserID, &member.Email, &member.Role, &member.JoinedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return gardenMemberView{}, storage.ErrRecordNotFound
+	}
+	return member, mapPostgresError(err)
+}
+
+type dbQuerier interface {
+	QueryRowContext(context.Context, string, ...any) *sql.Row
+}
+
+func getUser(ctx context.Context, db dbQuerier, email string) (userView, error) {
+	var user userView
+	err := db.QueryRowContext(ctx, `
+		SELECT id, name, email, activated, application_role, created_at, updated_at
+		FROM users
+		WHERE email = $1 AND deleted_at IS NULL`, email,
+	).Scan(&user.ID, &user.Name, &user.Email, &user.Activated, &user.Role, &user.CreatedAt, &user.UpdatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return userView{}, errUserNotFound
+	}
+	if err != nil {
+		return userView{}, err
+	}
+	return user, nil
+}
+
+func mapPostgresError(err error) error {
+	var pqErr *pq.Error
+	if errors.As(err, &pqErr) && pqErr.Code == "23505" && pqErr.Constraint == "users_email_key" {
+		return storage.ErrDuplicateEmail
+	}
+	return err
+}