MDL-73119 contentbank: Add pluginfile callback to content type plugins

contentbank/tests/contenttype_test.php

@@ -658,4 +658,17 @@ class contenttype_test extends \advanced_testcase {
         $url = $contenttype->get_download_url($content);
         $this->assertEmpty($url);
     }
+
+    /**
+     * Tests pluginfile result.
+     *
+     * @covers ::pluginfile
+     */
+    public function test_pluginfile() {
+        $this->resetAfterTest();
+        $this->setAdminUser();
+        $systemcontext = context_system::instance();
+        $contenttype = new contenttype($systemcontext);
+        $this->assertIsCallable([$contenttype, 'pluginfile']);
+    }
 }

contentbank/tests/fixtures/testable_contenttype.php

@@ -100,4 +100,20 @@ class contenttype extends \core_contentbank\contenttype {
 
         return true;
     }
+
+    /**
+     * This implements custom file serving.
+     *
+     * @param stdClass $course the course object
+     * @param stdClass $cm the course module object
+     * @param \context $context the context
+     * @param string $filearea the name of the file area
+     * @param array $args extra arguments (itemid, path)
+     * @param bool $forcedownload whether or not force download
+     * @param array $options additional options affecting the file serving
+     * @return void
+     */
+    public static function pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options = []): void {
+        return;
+    }
 }

lib/filelib.php

@@ -5129,16 +5129,26 @@ function file_pluginfile($relativepath, $forcedownload, $preview = null, $offlin
             send_file_not_found();
         }
 
+        $componentargs = fullclone($args);
         $itemid = (int)array_shift($args);
         $filename = array_pop($args);
         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
-        if (!$file = $fs->get_file($context->id, $component, $filearea, $itemid, $filepath, $filename) or
-            $file->is_directory()) {
-            send_file_not_found();
-        }
 
         \core\session\manager::write_close(); // Unlock session during file serving.
-        send_stored_file($file, 0, 0, true, $sendfileoptions); // must force download - security!
+
+        $contenttype = $DB->get_field('contentbank_content', 'contenttype', ['id' => $itemid]);
+        if (component_class_callback("\\{$contenttype}\\contenttype", 'pluginfile',
+                [$course, null, $context, $filearea, $componentargs, $forcedownload, $sendfileoptions], false) === false) {
+
+            if (!$file = $fs->get_file($context->id, $component, $filearea, $itemid, $filepath, $filename) or
+
+                $file->is_directory()) {
+                send_file_not_found();
+
+            } else {
+                send_stored_file($file, 0, 0, true, $sendfileoptions); // Must force download - security!
+            }
+        }
     } else if (strpos($component, 'mod_') === 0) {
         $modname = substr($component, 4);
         if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {