fix: Add additional model validation (#3725)

server/models/validators/NotContainsUrl.ts

@@ -0,0 +1,16 @@
+import { addAttributeOptions } from "sequelize-typescript";
+
+/**
+ * A decorator that validates that a string does not include something that
+ * looks like a URL.
+ */
+export default function NotContainsUrl(target: any, propertyName: string) {
+  return addAttributeOptions(target, propertyName, {
+    validate: {
+      not: {
+        args: /(www|file:|http:|https:)+[^\s]+[\w]/,
+        msg: "Must not contain a URL",
+      },
+    },
+  });
+}