SP-832199932200423: Added User interface for viewing authlinks for revisions.

node_authlink.module

@@ -200,9 +200,12 @@ function node_authlink_load_authkey($nid) {
  * Get edit URL of specified node.
  *
  * @param $node Node object or NID.
- * @param $op Operation to do with node. view, edit (default) or delete.
+ * @param string $op Operation to do with node. view, edit (default) or delete.
+ * @param null $revision_id
+ *
+ * @return bool|\Drupal\Core\GeneratedUrl|string
  */
-function node_authlink_get_url($node, $op = 'view') {
+function node_authlink_get_url($node, $op = 'view', $revision_id = NULL) {
   if (is_numeric($node)) {
     $node = Node::load($node);
   }
@@ -213,7 +216,12 @@ function node_authlink_get_url($node, $op = 'view') {
 
   switch ($op) {
     case 'view':
-      $route_name = 'entity.node.canonical';
+      if (is_numeric($revision_id)) {
+        $route_name = 'entity.node.revision';
+      }
+      else {
+        $route_name = 'entity.node.canonical';
+      }
       break;
     case 'edit':
       $route_name = 'entity.node.edit_form';
@@ -225,8 +233,12 @@ function node_authlink_get_url($node, $op = 'view') {
       return FALSE;
   }
 
+  $arguments = ['node' => $node->id()];
+  if (is_numeric($revision_id)) {
+    $arguments['node_revision'] = $revision_id;
+  }
 
-  $url = Url::fromRoute($route_name, ['node' => $node->id()], [
+  $url = Url::fromRoute($route_name, $arguments, [
     'absolute' => TRUE,
     'query' => ['authkey' => $node->authkey],
   ]);

src/Form/NodeAuthlinkNodeForm.php

@@ -69,15 +69,82 @@ class NodeAuthlinkNodeForm extends FormBase {
         if (!$op) {
           continue;
         }
-        $url = node_authlink_get_url($node, $op);
-        if ($url) {
-          // @todo: use a table instead.
-          $form['link_'.$op] = [
-            '#type' => 'markup',
-            '#markup' => "<p><strong>$op</strong>: $url</p>",
-          ];
 
+        // If $op is view, load all revisions.
+        $has_revisions = FALSE;
+        if ($op == 'view') {
+          $has_revisions = TRUE;
+          $node_storage = \Drupal::entityManager()->getStorage('node');
+
+          $result = $node_storage->getQuery()
+            ->allRevisions()
+            ->condition($node->getEntityType()->getKey('id'), $node->id())
+            ->sort($node->getEntityType()->getKey('revision'), 'DESC')
+            ->range(0, 50)
+            ->execute();
+          if (!empty($result)) {
+            $revision_options = [];
+            foreach ($result as $vid => $nid) {
+
+              $revision = $node_storage->loadRevision($vid);
+              $langcode = $node->language()->getId();
+              // Only show revisions that are affected by the language that is being
+              // displayed.
+              if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+
+                // Use revision link to link to revisions that are not active.
+                $dateFormatter = \Drupal::service('date.formatter');
+                $date = $dateFormatter->format($revision->revision_timestamp->value, 'short');
+
+                if ($revision->isDefaultRevision()) {
+                  $revision_options[$vid] = [
+                    'text' =>  $this->t('Current revision'),
+                    'url' => node_authlink_get_url($node, $op),
+                  ];
+                }
+                else {
+                  $revision_options[$vid] = [
+                    'text' =>  $date,
+                    'url' => node_authlink_get_url($node, $op, $vid),
+                  ];
+                }
+              }
+            }
+          }
+        }
+
+        if ($has_revisions) {
+          $form['revisions'] = [
+            '#type' => 'select',
+            '#title' => $this->t('Revisions'),
+            '#options' => [],
+          ];
+          // @todo: use a table instead.
+          foreach ($revision_options as $vid => $revision_option) {
+            $form['revisions']['#options'][$vid] = $revision_option['text'];
+
+            $form['link_' . $op . '_' . $vid] = [
+              '#type' => 'item',
+              '#markup' => "<p><strong>" . $op . "</strong>: " . $revision_option['url'] . "</p>",
+              '#states' => [
+                'visible' => [
+                  '[name="revisions"]' => ['value' => $vid],
+                ],
+              ],
+            ];
+          }
         }
+        else {
+          $url = node_authlink_get_url($node, $op);
+          if ($url) {
+            // @todo: use a table instead.
+            $form['link_'.$op] = [
+              '#type' => 'item',
+              '#markup' => "<p><strong>$op</strong>: $url</p>",
+            ];
+          }
+        }
+
       }
 
       if (node_authlink_load_authkey($node->id())) {