From b00f79425241ecf183cfefcd427b5e44e64bd1f4 Mon Sep 17 00:00:00 2001
From: Braden MacDonald <braden@opencraft.com>
Date: Thu, 17 Oct 2024 10:23:39 -0700
Subject: [PATCH 1/5] feat: confirmation modal to preview and accept v2 library
 updates

---
 .../modals/preview_v2_library_changes.js      | 98 +++++++++++++++++++
 cms/static/js/views/pages/container.js        | 18 +++-
 cms/static/sass/views/_container.scss         | 13 +++
 cms/templates/studio_xblock_wrapper.html      |  5 +-
 4 files changed, 131 insertions(+), 3 deletions(-)
 create mode 100644 cms/static/js/views/modals/preview_v2_library_changes.js

diff --git a/cms/static/js/views/modals/preview_v2_library_changes.js b/cms/static/js/views/modals/preview_v2_library_changes.js
new file mode 100644
index 000000000000..9a48f040f56d
--- /dev/null
+++ b/cms/static/js/views/modals/preview_v2_library_changes.js
@@ -0,0 +1,98 @@
+/**
+ * The PreviewLibraryChangesModal is a Backbone view that shows an iframe in a
+ * modal window. The iframe embeds a view from the Authoring MFE that allows
+ * authors to preview the new version of a library-sourced XBlock, and decide
+ * whether to accept ("sync") or reject ("ignore") the changes.
+ */
+define(['jquery', 'underscore', 'gettext', 'js/views/modals/base_modal',
+    'js/views/utils/xblock_utils'],
+function($, _, gettext, BaseModal, XBlockViewUtils) {
+    'use strict';
+
+    var PreviewLibraryChangesModal = BaseModal.extend({
+        events: _.extend({}, BaseModal.prototype.events, {
+            'click .action-accept': 'acceptChanges',
+            'click .action-ignore': 'ignoreChanges',
+        }),
+
+        options: $.extend({}, BaseModal.prototype.options, {
+            modalName: 'preview-lib-changes',
+            modalSize: 'med',
+            view: 'studio_view',
+            viewSpecificClasses: 'modal-lib-preview confirm',
+            // Translators: "title" is the name of the current component being edited.
+            titleFormat: gettext('Preview changes to: {title}'),
+            addPrimaryActionButton: false,
+        }),
+
+        initialize: function() {
+            BaseModal.prototype.initialize.call(this);
+            // this.template = this.loadTemplate('edit-xblock-modal');
+            // this.editorModeButtonTemplate = this.loadTemplate('editor-mode-button');
+        },
+
+        /**
+         * Adds the action buttons to the modal.
+         */
+        addActionButtons: function() {
+            this.addActionButton('accept', gettext('Accept changes'), true);
+            this.addActionButton('ignore', gettext('Ignore changes'));
+            this.addActionButton('cancel', gettext('Cancel'));
+        },
+
+        /**
+         * Show an edit modal for the specified xblock
+         * @param xblockElement The element that contains the xblock to be edited.
+         * @param rootXBlockInfo An XBlockInfo model that describes the root xblock on the page.
+         * @param refreshFunction A function to refresh the block after it has been updated
+         */
+        showPreviewFor: function(xblockElement, rootXBlockInfo, refreshFunction) {
+            this.xblockElement = xblockElement;
+            this.xblockInfo = XBlockViewUtils.findXBlockInfo(xblockElement, rootXBlockInfo);
+            this.courseAuthoringMfeUrl = rootXBlockInfo.attributes.course_authoring_url;
+            const headerElement = xblockElement.find('.xblock-header-primary');
+            this.upstreamBlockId = headerElement.data('upstream-ref');
+            this.upstreamBlockVersionSynced = headerElement.data('version-synced');
+            // this.options.modalType = this.xblockInfo.get('category');
+            this.refreshFunction = refreshFunction;
+
+            this.render();
+            this.show();
+        },
+
+        getContentHtml: function() {
+            return `
+                <iframe src="${this.courseAuthoringMfeUrl}/legacy/preview-changes/${this.upstreamBlockId}?old=${this.upstreamBlockVersionSynced}">
+            `;
+        },
+
+        getTitle: function() {
+            var displayName = this.xblockInfo.get('display_name');
+            if (!displayName) {
+                if (this.xblockInfo.isVertical()) {
+                    displayName = gettext('Unit');
+                } else {
+                    displayName = gettext('Component');
+                }
+            }
+            return edx.StringUtils.interpolate(
+                this.options.titleFormat, {
+                    title: displayName
+                }
+            );
+        },
+
+        acceptChanges: function(event) {
+            event.preventDefault();
+        },
+
+        ignoreChanges: function(event) {
+            event.preventDefault();
+            if (confirm(gettext('Are you sure you want to ignore these changes?'))) {
+                // TODO
+            }
+        },
+    });
+
+    return PreviewLibraryChangesModal;
+});
diff --git a/cms/static/js/views/pages/container.js b/cms/static/js/views/pages/container.js
index 7e1f6de3b652..29f546fd9541 100644
--- a/cms/static/js/views/pages/container.js
+++ b/cms/static/js/views/pages/container.js
@@ -8,14 +8,15 @@ define(['jquery', 'underscore', 'backbone', 'gettext', 'js/views/pages/base_page
     'js/models/xblock_info', 'js/views/xblock_string_field_editor', 'js/views/xblock_access_editor',
     'js/views/pages/container_subviews', 'js/views/unit_outline', 'js/views/utils/xblock_utils',
     'common/js/components/views/feedback_notification', 'common/js/components/views/feedback_prompt',
-    'js/views/utils/tagging_drawer_utils', 'js/utils/module',
+    'js/views/utils/tagging_drawer_utils', 'js/utils/module', 'js/views/modals/preview_v2_library_changes'
 ],
 function($, _, Backbone, gettext, BasePage,
     ViewUtils, ContainerView, XBlockView,
     AddXBlockComponent, EditXBlockModal, MoveXBlockModal,
     XBlockInfo, XBlockStringFieldEditor, XBlockAccessEditor,
     ContainerSubviews, UnitOutlineView, XBlockUtils,
-    NotificationView, PromptView, TaggingDrawerUtils, ModuleUtils) {
+    NotificationView, PromptView, TaggingDrawerUtils, ModuleUtils,
+    PreviewLibraryChangesModal) {
     'use strict';
 
     var XBlockContainerPage = BasePage.extend({
@@ -28,6 +29,7 @@ function($, _, Backbone, gettext, BasePage,
             'click .copy-button': 'copyXBlock',
             'click .move-button': 'showMoveXBlockModal',
             'click .delete-button': 'deleteXBlock',
+            'click .library-sync-button': 'showXBlockLibraryChangesPreview',
             'click .show-actions-menu-button': 'showXBlockActionsMenu',
             'click .new-component-button': 'scrollToNewComponentButtons',
             'click .save-button': 'saveSelectedLibraryComponents',
@@ -396,6 +398,18 @@ function($, _, Backbone, gettext, BasePage,
             });
         },
 
+        showXBlockLibraryChangesPreview: function(event, options) {
+            event.preventDefault();
+
+            var xblockElement = this.findXBlockElement(event.target),
+                self = this,
+                modal = new PreviewLibraryChangesModal(options);
+
+            modal.showPreviewFor(xblockElement, this.model, function() {
+                self.refreshXBlock(xblockElement, false);
+            });
+        },
+
         /**
          * If the new "Actions" menu is enabled, most XBlock actions like
          * Duplicate, Move, Delete, Manage Access, etc. are moved into this
diff --git a/cms/static/sass/views/_container.scss b/cms/static/sass/views/_container.scss
index 5a674ba6e03a..8ad12428fc73 100644
--- a/cms/static/sass/views/_container.scss
+++ b/cms/static/sass/views/_container.scss
@@ -562,6 +562,19 @@
   }
 }
 
+// Modal for previewing changes to a library-sourced block
+// cms/static/js/views/modals/preview_v2_library_changes.js
+.modal-lib-preview {
+  .modal-content {
+    padding: 0 !important;
+
+    & > iframe {
+      width: 100%;
+      min-height: 350px;
+    }
+  }
+}
+
 .ltiLaunchFrame{
     width:100%;
     height:100%
diff --git a/cms/templates/studio_xblock_wrapper.html b/cms/templates/studio_xblock_wrapper.html
index 0ee1099ca982..d69ddea66879 100644
--- a/cms/templates/studio_xblock_wrapper.html
+++ b/cms/templates/studio_xblock_wrapper.html
@@ -89,6 +89,10 @@
     authoring_MFE_base_url = ${get_editor_page_base_url(xblock.location.course_key)}
     data-block-type = ${xblock.scope_ids.block_type}
     data-usage-id = ${xblock.scope_ids.usage_id}
+    % if upstream_info.upstream_ref:
+        data-upstream-ref = ${upstream_info.upstream_ref}
+        data-version-synced = ${upstream_info.version_synced}
+    %endif
     >
         <div class="header-details">
             % if show_inline:
@@ -137,7 +141,6 @@
                                 <button
                                     class="btn-default library-sync-button action-button"
                                     data-tooltip="${_("Update available - click to sync")}"
-                                    onclick="$.post('/api/contentstore/v2/downstreams/${xblock.usage_key}/sync').done(() => { location.reload(); })"
                                 >
                                     <span class="icon fa fa-refresh" aria-hidden="true"></span>
                                     <span>${_("Update available")}</span>

From abe17323db05d9a1e22100463af09ff3b8fbf0e8 Mon Sep 17 00:00:00 2001
From: Braden MacDonald <braden@opencraft.com>
Date: Thu, 17 Oct 2024 14:33:06 -0700
Subject: [PATCH 2/5] feat: implement accept and ignore buttons

---
 .../modals/preview_v2_library_changes.js      | 28 +++++++++++++++----
 cms/static/sass/views/_container.scss         |  1 +
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/cms/static/js/views/modals/preview_v2_library_changes.js b/cms/static/js/views/modals/preview_v2_library_changes.js
index 9a48f040f56d..4ae18ddc4a12 100644
--- a/cms/static/js/views/modals/preview_v2_library_changes.js
+++ b/cms/static/js/views/modals/preview_v2_library_changes.js
@@ -5,8 +5,8 @@
  * whether to accept ("sync") or reject ("ignore") the changes.
  */
 define(['jquery', 'underscore', 'gettext', 'js/views/modals/base_modal',
-    'js/views/utils/xblock_utils'],
-function($, _, gettext, BaseModal, XBlockViewUtils) {
+    'common/js/components/utils/view_utils', 'js/views/utils/xblock_utils'],
+function($, _, gettext, BaseModal, ViewUtils, XBlockViewUtils) {
     'use strict';
 
     var PreviewLibraryChangesModal = BaseModal.extend({
@@ -51,9 +51,9 @@ function($, _, gettext, BaseModal, XBlockViewUtils) {
             this.xblockInfo = XBlockViewUtils.findXBlockInfo(xblockElement, rootXBlockInfo);
             this.courseAuthoringMfeUrl = rootXBlockInfo.attributes.course_authoring_url;
             const headerElement = xblockElement.find('.xblock-header-primary');
+            this.downstreamBlockId = this.xblockInfo.get('id');
             this.upstreamBlockId = headerElement.data('upstream-ref');
             this.upstreamBlockVersionSynced = headerElement.data('version-synced');
-            // this.options.modalType = this.xblockInfo.get('category');
             this.refreshFunction = refreshFunction;
 
             this.render();
@@ -84,13 +84,29 @@ function($, _, gettext, BaseModal, XBlockViewUtils) {
 
         acceptChanges: function(event) {
             event.preventDefault();
+            $.post(`/api/contentstore/v2/downstreams/${this.downstreamBlockId}/sync`).done(() => {
+                this.hide();
+                this.refreshFunction();
+            }); // Note: if this POST request fails, Studio will display an error toast automatically.
         },
 
         ignoreChanges: function(event) {
             event.preventDefault();
-            if (confirm(gettext('Are you sure you want to ignore these changes?'))) {
-                // TODO
-            }
+            ViewUtils.confirmThenRunOperation(
+                gettext('Ignore these changes?'),
+                gettext('Would you like to permanently ignore this updated version? If so, you won\'t be able to update this until a newer version is published (in the library).'),
+                gettext('Ignore'),
+                () => {
+                    $.ajax({
+                        type: 'DELETE',
+                        url: `/api/contentstore/v2/downstreams/${this.downstreamBlockId}/sync`,
+                        data: {},
+                    }).done(() => {
+                        this.hide();
+                        this.refreshFunction();
+                    }); // Note: if this DELETE request fails, Studio will display an error toast automatically.
+                }
+            );
         },
     });
 
diff --git a/cms/static/sass/views/_container.scss b/cms/static/sass/views/_container.scss
index 8ad12428fc73..da87873283a8 100644
--- a/cms/static/sass/views/_container.scss
+++ b/cms/static/sass/views/_container.scss
@@ -571,6 +571,7 @@
     & > iframe {
       width: 100%;
       min-height: 350px;
+      background: url('#{$static-path}/images/spinner.gif') center center no-repeat;
     }
   }
 }

From 418129c7786ac5bd5bb54a97940bd128eaf9e794 Mon Sep 17 00:00:00 2001
From: Braden MacDonald <braden@opencraft.com>
Date: Thu, 17 Oct 2024 14:38:54 -0700
Subject: [PATCH 3/5] chore: remove two unused lines of code

---
 cms/static/js/views/modals/preview_v2_library_changes.js | 2 --
 1 file changed, 2 deletions(-)

diff --git a/cms/static/js/views/modals/preview_v2_library_changes.js b/cms/static/js/views/modals/preview_v2_library_changes.js
index 4ae18ddc4a12..e80c40e3ea3e 100644
--- a/cms/static/js/views/modals/preview_v2_library_changes.js
+++ b/cms/static/js/views/modals/preview_v2_library_changes.js
@@ -27,8 +27,6 @@ function($, _, gettext, BaseModal, ViewUtils, XBlockViewUtils) {
 
         initialize: function() {
             BaseModal.prototype.initialize.call(this);
-            // this.template = this.loadTemplate('edit-xblock-modal');
-            // this.editorModeButtonTemplate = this.loadTemplate('editor-mode-button');
         },
 
         /**

From 9458426fdee38fc8d7c55814ecf4e8037bc03a23 Mon Sep 17 00:00:00 2001
From: Braden MacDonald <braden@opencraft.com>
Date: Thu, 17 Oct 2024 14:47:20 -0700
Subject: [PATCH 4/5] fix: only sync from published versions of library
 components

---
 cms/lib/xblock/upstream_sync.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/cms/lib/xblock/upstream_sync.py b/cms/lib/xblock/upstream_sync.py
index 785cc7dc7e36..2ee22319a238 100644
--- a/cms/lib/xblock/upstream_sync.py
+++ b/cms/lib/xblock/upstream_sync.py
@@ -165,11 +165,7 @@ def get_for_block(cls, downstream: XBlock) -> t.Self:
         return cls(
             upstream_ref=downstream.upstream,
             version_synced=downstream.upstream_version,
-            version_available=(lib_meta.draft_version_num if lib_meta else None),
-            # TODO: Previous line is wrong. It should use the published version instead, but the
-            # LearningCoreXBlockRuntime APIs do not yet support published content yet.
-            # Will be fixed in a follow-up task: https://github.com/openedx/edx-platform/issues/35582
-            # version_available=(lib_meta.published_version_num if lib_meta else None),
+            version_available=(lib_meta.published_version_num if lib_meta else None),
             version_declined=downstream.upstream_version_declined,
             error_message=None,
         )
@@ -213,9 +209,14 @@ def _load_upstream_link_and_block(downstream: XBlock, user: User) -> tuple[Upstr
     """
     link = UpstreamLink.get_for_block(downstream)  # can raise UpstreamLinkException
     # We import load_block here b/c UpstreamSyncMixin is used by cms/envs, which loads before the djangoapps are ready.
-    from openedx.core.djangoapps.xblock.api import load_block  # pylint: disable=wrong-import-order
+    from openedx.core.djangoapps.xblock.api import load_block, CheckPerm, LatestVersion  # pylint: disable=wrong-import-order
     try:
-        lib_block: XBlock = load_block(LibraryUsageLocatorV2.from_string(downstream.upstream), user)
+        lib_block: XBlock = load_block(
+            LibraryUsageLocatorV2.from_string(downstream.upstream),
+            user,
+            check_permission=CheckPerm.CAN_READ_AS_AUTHOR,
+            version=LatestVersion.PUBLISHED,
+        )
     except (NotFound, PermissionDenied) as exc:
         raise BadUpstream(_("Linked library item could not be loaded: {}").format(downstream.upstream)) from exc
     return link, lib_block

From 0366f0f5c68d69c28138296cef4899b2536528b9 Mon Sep 17 00:00:00 2001
From: Braden MacDonald <braden@opencraft.com>
Date: Thu, 17 Oct 2024 15:09:08 -0700
Subject: [PATCH 5/5] test: update tests for syncing (published only)

---
 cms/lib/xblock/test/test_upstream_sync.py | 24 ++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/cms/lib/xblock/test/test_upstream_sync.py b/cms/lib/xblock/test/test_upstream_sync.py
index 5db020393eab..6a3af7455b5d 100644
--- a/cms/lib/xblock/test/test_upstream_sync.py
+++ b/cms/lib/xblock/test/test_upstream_sync.py
@@ -48,6 +48,8 @@ def setUp(self):
         upstream.data = "<html><body>Upstream content V2</body></html>"
         upstream.save()
 
+        libs.publish_changes(self.library.key, self.user.id)
+
     def test_sync_bad_downstream(self):
         """
         Syncing into an unsupported downstream (such as a another Content Library block) raises BadDownstream, but
@@ -133,6 +135,16 @@ def test_sync_updates_happy_path(self):
         upstream.data = "<html><body>Upstream content V3</body></html>"
         upstream.save()
 
+        # Assert that un-published updates are not yet pulled into downstream
+        sync_from_upstream(downstream, self.user)
+        assert downstream.upstream_version == 2  # Library blocks start at version 2 (v1 is the empty new block)
+        assert downstream.upstream_display_name == "Upstream Title V2"
+        assert downstream.display_name == "Upstream Title V2"
+        assert downstream.data == "<html><body>Upstream content V2</body></html>"
+
+        # Publish changes
+        libs.publish_changes(self.library.key, self.user.id)
+
         # Follow-up sync. Assert that updates are pulled into downstream.
         sync_from_upstream(downstream, self.user)
         assert downstream.upstream_version == 3
@@ -157,6 +169,7 @@ def test_sync_updates_to_modified_content(self):
         upstream.display_name = "Upstream Title V3"
         upstream.data = "<html><body>Upstream content V3</body></html>"
         upstream.save()
+        libs.publish_changes(self.library.key, self.user.id)
 
         # Downstream modifications
         downstream.display_name = "Downstream Title Override"  # "safe" customization
@@ -277,13 +290,21 @@ def test_prompt_and_decline_sync(self):
         assert link.version_available == 2
         assert link.ready_to_sync is False
 
-        # Upstream updated to V3
+        # Upstream updated to V3, but not yet published
         upstream = xblock.load_block(self.upstream_key, self.user)
         upstream.data = "<html><body>Upstream content V3</body></html>"
         upstream.save()
         link = UpstreamLink.get_for_block(downstream)
         assert link.version_synced == 2
         assert link.version_declined is None
+        assert link.version_available == 2
+        assert link.ready_to_sync is False
+
+        # Publish changes
+        libs.publish_changes(self.library.key, self.user.id)
+        link = UpstreamLink.get_for_block(downstream)
+        assert link.version_synced == 2
+        assert link.version_declined is None
         assert link.version_available == 3
         assert link.ready_to_sync is True
 
@@ -299,6 +320,7 @@ def test_prompt_and_decline_sync(self):
         upstream = xblock.load_block(self.upstream_key, self.user)
         upstream.data = "<html><body>Upstream content V4</body></html>"
         upstream.save()
+        libs.publish_changes(self.library.key, self.user.id)
         link = UpstreamLink.get_for_block(downstream)
         assert link.version_synced == 2
         assert link.version_declined == 3