work on emojis

internal/util/validation.go

@@ -142,3 +142,13 @@ func ValidatePrivacy(privacy string) error {
 	// TODO: add some validation logic here -- length, characters, etc
 	return nil
 }
+
+// ValidateEmojiShortcode just runs the given shortcode through the regular expression
+// for emoji shortcodes, to figure out whether it's a valid shortcode, ie., 2-30 characters,
+// lowercase a-z, numbers, and underscores.
+func ValidateEmojiShortcode(shortcode string) error {
+	if !emojiShortcodeRegex.MatchString(shortcode) {
+		return fmt.Errorf("shortcode %s did not pass validation, must be between 2 and 30 characters, lowercase letters, numbers, and underscores only", shortcode)
+	}
+	return nil
+}