Adds enablePublishWithExistingDOI configuration

closes #2202

src/js/models/AppModel.js

@@ -1079,6 +1079,15 @@ define(['jquery', 'underscore', 'backbone'],
       */
       isJSONLDEnabled: true,
 
+      /**
+      * If true, users can see a "Publish" button in the MetadataView if enablePublishDOI is also enabled,
+      * even if a DOI is assigned to the dataset
+      * If false, the publish button will not show up when a DOI is already assigned to the dataset.
+      * @type {boolean}
+      * @default false
+      */
+      enablePublishWithExistingDOI: false,
+
       /**
       * If true, users can see a "Publish" button in the MetadataView, which makes the metadata
       * document public and gives it a DOI identifier.

src/js/views/MetadataView.js

@@ -1234,7 +1234,8 @@ define(['jquery',
             //Determine if this metadata can be published.
             // The Publish feature has to be enabled in the app.
             // The model cannot already have a DOI
-            var canBePublished = MetacatUI.appModel.get("enablePublishDOI") && !view.model.isDOI();
+            var canBePublished = MetacatUI.appModel.get("enablePublishDOI") &&
+                (MetacatUI.appModel.get("enablePublishWithExistingDOI") || !view.model.isDOI());
 
             //If publishing is enabled, check if only certain users and groups can publish metadata
             if (canBePublished) {