MDL-77762 contentbank: always provide exit button when appropriate.

If the current user can access the content bank in the context of the
current item, then provide link back to it.

contentbank/classes/output/viewcontent.php

@@ -14,16 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-/**
- * Class containing data for a content view.
- *
- * @package    core_contentbank
- * @copyright  2020 Victor Deniz <[email protected]>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
 
 namespace core_contentbank\output;
 
+use context;
 use core_contentbank\content;
 use core_contentbank\contenttype;
 use moodle_url;
@@ -180,8 +174,13 @@ class viewcontent implements renderable, templatable {
             $data->editcontenturl = $editcontenturl->out(false);
         }
 
-        $closeurl = new moodle_url('/contentbank/index.php', ['contextid' => $this->content->get_contextid()]);
-        $data->closeurl = $closeurl->out(false);
+        // Close/exit link for those users who can access that context.
+        $context = context::instance_by_id($this->content->get_contextid());
+        if (has_capability('moodle/contentbank:access', $context)) {
+            $closeurl = new moodle_url('/contentbank/index.php', ['contextid' => $context->id]);
+            $data->closeurl = $closeurl->out(false);
+        }
+
         $data->actionmenu = $this->get_edit_actions_dropdown();
         $data->heading = $this->content->get_name();
         if ($this->content->get_visibility() == content::VISIBILITY_UNLISTED) {

contentbank/templates/viewcontent/toolbarview.mustache

@@ -54,31 +54,28 @@ along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
     }
 }}
 {{#heading}}<h2>{{heading}}</h2>{{/heading}}
-{{#usercanedit}}
 <div class="cb-toolbar-container container-fluid my-2">
     <div class="row">
-        <div class="d-flex">
+    {{#usercanedit}}
+        <div class="d-flex mr-3">
             <a href="{{editcontenturl}}" class="btn btn-primary" data-action="edit-content">
                 {{#str}}edit{{/str}}
             </a>
         </div>
+    {{/usercanedit}}
 
-        {{#actionmenu}}
-            <div class="ml-3">
-                {{> core_contentbank/contentbankmenu }}
-            </div>
-        {{/actionmenu}}
+    {{#actionmenu}}
+        <div>
+            {{> core_contentbank/contentbankmenu }}
+        </div>
+    {{/actionmenu}}
 
+    {{#closeurl}}
         <div class="ml-auto">
             <a href="{{closeurl}}" class="btn btn-secondary" data-action="close-content">
                 {{#str}}exit, core_contentbank{{/str}}
             </a>
         </div>
+    {{/closeurl}}
     </div>
 </div>
-{{/usercanedit}}
-{{^usercanedit}}
-    {{#actionmenu}}
-        {{> core_contentbank/contentbankmenu }}
-    {{/actionmenu}}
-{{/usercanedit}}