feat: custom content type icons, built-in types, user lookup

internal/domain/contenttype/contentTypeDomain.go

@@ -10,6 +10,7 @@ var (
 	ErrKeyTaken            = errors.New("a content type with that key already exists")
 	ErrInvalidName         = errors.New("invalid content type name")
 	ErrInvalidKey          = errors.New("invalid content type key")
+	ErrInvalidIcon         = errors.New("invalid content type icon")
 	ErrInvalidField        = errors.New("invalid field")
 	ErrHasEntries          = errors.New("the content type still has entries")
 	ErrSchemaIncompatible  = errors.New("the schema is incompatible with the stored entries")
@@ -58,6 +59,7 @@ type ContentType struct {
 	ID        uint32    `json:"id"`
 	Key       string    `json:"key"`
 	Name      string    `json:"name"`
+	Icon      *string   `json:"icon"`
 	Fields    []Field   `json:"fields"`
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`

internal/domain/contenttype/fieldSchema.go

@@ -7,6 +7,8 @@ import (
 	"unicode/utf8"
 )
 
+var iconPattern = regexp.MustCompile(`^[a-z][a-z0-9-]{0,39}$`)
+
 var fieldKeyPattern = regexp.MustCompile(`^[a-z][a-z0-9_]{0,39}$`)
 
 func ValidateKey(key string) error {
@@ -24,6 +26,16 @@ func ValidateName(name string) error {
 	return nil
 }
 
+func ValidateIcon(icon *string) (*string, error) {
+	if icon == nil || *icon == "" {
+		return nil, nil
+	}
+	if !iconPattern.MatchString(*icon) {
+		return nil, ErrInvalidIcon
+	}
+	return icon, nil
+}
+
 func ValidateFields(fields []Field) ([]Field, error) {
 	if len(fields) < MinFields || len(fields) > MaxFields {
 		return nil, ErrInvalidField