feat: support time_zone for user registration context

authsession/internal/adapters/userservice/rest_client.go

@@ -149,25 +149,42 @@ func (c *RESTClient) ExistsByUserID(ctx context.Context, userID common.UserID) (
 	return response.Exists, nil
 }
 
-// EnsureUserByEmail returns an existing user for email, creates a new user
-// when registration is allowed, or reports a blocked outcome.
-func (c *RESTClient) EnsureUserByEmail(ctx context.Context, email common.Email) (ports.EnsureUserResult, error) {
+// EnsureUserByEmail returns an existing user for input.Email, creates a new
+// user when registration is allowed, or reports a blocked outcome.
+func (c *RESTClient) EnsureUserByEmail(ctx context.Context, input ports.EnsureUserInput) (ports.EnsureUserResult, error) {
 	if err := validateContext(ctx, "ensure user by email"); err != nil {
 		return ports.EnsureUserResult{}, err
 	}
-	if err := email.Validate(); err != nil {
+	if err := input.Validate(); err != nil {
 		return ports.EnsureUserResult{}, fmt.Errorf("ensure user by email: %w", err)
 	}
 
+	payload := struct {
+		Email               string `json:"email"`
+		RegistrationContext *struct {
+			PreferredLanguage string `json:"preferred_language"`
+			TimeZone          string `json:"time_zone"`
+		} `json:"registration_context,omitempty"`
+	}{
+		Email: input.Email.String(),
+	}
+	if input.RegistrationContext != nil {
+		payload.RegistrationContext = &struct {
+			PreferredLanguage string `json:"preferred_language"`
+			TimeZone          string `json:"time_zone"`
+		}{
+			PreferredLanguage: input.RegistrationContext.PreferredLanguage,
+			TimeZone:          input.RegistrationContext.TimeZone,
+		}
+	}
+
 	var response struct {
 		Outcome         ports.EnsureUserOutcome        `json:"outcome"`
 		UserID          string                         `json:"user_id,omitempty"`
 		BlockReasonCode userresolution.BlockReasonCode `json:"block_reason_code,omitempty"`
 	}
 
-	if err := c.doJSON(ctx, "ensure user by email", http.MethodPost, ensureByEmailPath, map[string]string{
-		"email": email.String(),
-	}, &response, false); err != nil {
+	if err := c.doJSON(ctx, "ensure user by email", http.MethodPost, ensureByEmailPath, payload, &response, false); err != nil {
 		return ports.EnsureUserResult{}, err
 	}