Silence the CKEditor version check/nag but include a system check war…

…ning of our own

Fixes #761.

ckeditor/apps.py

@@ -0,0 +1,19 @@
+from django.apps import AppConfig
+from django.core.checks import Warning, register
+
+
+def check_ckeditor_version(app_configs, **kwargs):
+    return [
+        Warning(
+            "django-ckeditor bundles CKEditor 4.22.1 which isn't supported anmyore and which does have unfixed security issues, see for example https://ckeditor.com/cke4/release/CKEditor-4.24.0-LTS . You should consider strongly switching to a different editor (maybe CKEditor 5 respectively django-ckeditor-5 after checking whether the CKEditor 5 license terms work for you) or switch to the non-free CKEditor 4 LTS package. See https://ckeditor.com/ckeditor-4-support/ for more on this. (Note! This notice has been added by the django-ckeditor developers and we are not affiliated with CKSource and were not included in the licensing change, so please refrain from complaining to us. Thanks.)",
+            id="ckeditor.W001",
+        )
+    ]
+
+
+class CKEditorConfig(AppConfig):
+    default_auto_field = "django.db.models.AutoField"
+    name = "ckeditor"
+
+    def ready(self):
+        register(check_ckeditor_version)

ckeditor/widgets.py

@@ -101,7 +101,7 @@ def media(self):
                     },
                 ),
                 "ckeditor/ckeditor/ckeditor.js",
-            )
+            ),
         )
 
     def get_context(self, name, value, attrs):
@@ -126,3 +126,4 @@ def _set_config(self):
         elif lang == "zh-hant":
             lang = "zh"
         self.config["language"] = lang
+        self.config["versionCheck"] = False