sanitizer suppress list, allow empty attachment

application/Espo/Core/FieldSanitize/SanitizeManager.php

@@ -120,7 +120,16 @@ class SanitizeManager
 
         /** @var class-string<Sanitizer>[] $fieldClassNameList */
         $fieldClassNameList = $this->metadata->get("entityDefs.$entityType.fields.$field.sanitizerClassNameList") ?? [];
+        $ignoreList = $this->metadata->get("entityDefs.$entityType.fields.$field.sanitizerSuppressClassNameList") ?? [];
 
-        return array_merge($classNameList, $fieldClassNameList);
+        $list = array_merge($classNameList, $fieldClassNameList);
+
+        if ($ignoreList === []) {
+            return $list;
+        }
+
+        $list = array_diff($list, $ignoreList);
+
+        return array_values($list);
     }
 }

application/Espo/Resources/metadata/entityDefs/Attachment.json

@@ -48,7 +48,11 @@
         },
         "contents": {
             "type": "text",
-            "notStorable": true
+            "notStorable": true,
+            "sanitizerClassNameList": [],
+            "sanitizerSuppressClassNameList": [
+                "Espo\\Classes\\FieldSanitizers\\EmptyStringToNull"
+            ]
         },
         "role": {
             "type": "enum",

schema/metadata/entityDefs.json

@@ -714,6 +714,13 @@
                     },
                     "description": "A list of sanitizers. Should implement Espo\\Core\\FieldSanitize\\Sanitizer."
                 },
+                "sanitizerSuppressClassNameList": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    },
+                    "description": "A list of sanitizers to be suppressed."
+                },
                 "inlineEditDisabled": {
                     "type": "boolean",
                     "default": "Disable inline edit."