first commit

Made-with: Cursor

internal/utils/validation.go

@@ -0,0 +1,97 @@
+package utils
+
+import (
+	"net/mail"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/calendarapi/internal/models"
+	"github.com/google/uuid"
+)
+
+var hexColorRegex = regexp.MustCompile(`^#[0-9A-Fa-f]{6}$`)
+
+func ValidateEmail(email string) error {
+	if email == "" {
+		return models.NewValidationError("email is required")
+	}
+	if _, err := mail.ParseAddress(email); err != nil {
+		return models.NewValidationError("invalid email format")
+	}
+	return nil
+}
+
+func ValidatePassword(password string) error {
+	if len(password) < 10 {
+		return models.NewValidationError("password must be at least 10 characters")
+	}
+	return nil
+}
+
+func ValidateTimezone(tz string) error {
+	if tz == "" {
+		return nil
+	}
+	if _, err := time.LoadLocation(tz); err != nil {
+		return models.NewValidationError("invalid IANA timezone: " + tz)
+	}
+	return nil
+}
+
+func ValidateCalendarName(name string) error {
+	if len(name) < 1 || len(name) > 80 {
+		return models.NewValidationError("calendar name must be 1-80 characters")
+	}
+	return nil
+}
+
+func ValidateColor(color string) error {
+	if color == "" {
+		return nil
+	}
+	if !hexColorRegex.MatchString(color) {
+		return models.NewValidationError("color must be hex format #RRGGBB")
+	}
+	return nil
+}
+
+func ValidateEventTitle(title string) error {
+	if len(title) < 1 || len(title) > 140 {
+		return models.NewValidationError("event title must be 1-140 characters")
+	}
+	return nil
+}
+
+func ValidateTimeRange(start, end time.Time) error {
+	if !end.After(start) {
+		return models.NewValidationError("end_time must be after start_time")
+	}
+	return nil
+}
+
+func ValidateReminderMinutes(minutes int32) error {
+	if minutes < 0 || minutes > 10080 {
+		return models.NewValidationError("minutes_before must be 0-10080")
+	}
+	return nil
+}
+
+func ValidateUUID(s string) (uuid.UUID, error) {
+	id, err := uuid.Parse(s)
+	if err != nil {
+		return uuid.Nil, models.NewValidationError("invalid UUID: " + s)
+	}
+	return id, nil
+}
+
+func NormalizeEmail(email string) string {
+	return strings.ToLower(strings.TrimSpace(email))
+}
+
+func ValidateRecurrenceRangeLimit(start, end time.Time) error {
+	if end.Sub(start) > 366*24*time.Hour {
+		return models.NewValidationError("date range cannot exceed 1 year")
+	}
+	return nil
+}