diff --git a/course/externallib.php b/course/externallib.php
index 27d2629f990..3e8744cc99d 100644
--- a/course/externallib.php
+++ b/course/externallib.php
@@ -318,7 +318,28 @@ class core_course_external extends external_api {
                             require_once($CFG->dirroot . '/mod/' . $cm->modname . '/lib.php');
                             $getcontentfunction = $cm->modname.'_export_contents';
                             if (function_exists($getcontentfunction)) {
-                                if (empty($filters['excludecontents']) and $contents = $getcontentfunction($cm, $baseurl)) {
+                                $contents = $getcontentfunction($cm, $baseurl);
+                                $module['contentsinfo'] = array(
+                                    'filescount' => count($contents),
+                                    'filessize' => 0,
+                                    'lastmodified' => 0,
+                                    'mimetypes' => array(),
+                                );
+                                foreach ($contents as $content) {
+                                    if (isset($content['filesize'])) {
+                                        $module['contentsinfo']['filessize'] += $content['filesize'];
+                                    }
+                                    if (isset($content['timemodified']) &&
+                                            ($content['timemodified'] > $module['contentsinfo']['lastmodified'])) {
+
+                                        $module['contentsinfo']['lastmodified'] = $content['timemodified'];
+                                    }
+                                    if (isset($content['mimetype'])) {
+                                        $module['contentsinfo']['mimetypes'][$content['mimetype']] = $content['mimetype'];
+                                    }
+                                }
+
+                                if (empty($filters['excludecontents']) and !empty($contents)) {
                                     $module['contents'] = $contents;
                                 } else {
                                     $module['contents'] = array();
@@ -470,7 +491,18 @@ class core_course_external extends external_api {
                                                   'license' => new external_value(PARAM_TEXT, 'Content license'),
                                               )
                                           ), VALUE_DEFAULT, array()
-                                      )
+                                      ),
+                                    'contentsinfo' => new external_single_structure(
+                                        array(
+                                            'filescount' => new external_value(PARAM_INT, 'Total number of files.'),
+                                            'filessize' => new external_value(PARAM_INT, 'Total files size.'),
+                                            'lastmodified' => new external_value(PARAM_INT, 'Last time files were modified.'),
+                                            'mimetypes' => new external_multiple_structure(
+                                                new external_value(PARAM_RAW, 'File mime type.'),
+                                                'Files mime types.'
+                                            ),
+                                        ), 'Contents summary information.', VALUE_OPTIONAL
+                                    ),
                                 )
                             ), 'list of module'
                     )
diff --git a/course/tests/externallib_test.php b/course/tests/externallib_test.php
index 7520c64ca5a..ad77f90a026 100644
--- a/course/tests/externallib_test.php
+++ b/course/tests/externallib_test.php
@@ -1264,6 +1264,58 @@ class core_course_externallib_testcase extends externallib_advanced_testcase {
         $this->assertEquals('text/plain', $customdata['filedetails']['mimetype']);
     }
 
+    /**
+     * Test contents info is returned.
+     */
+    public function test_get_course_contents_contentsinfo() {
+        global $USER;
+
+        $this->resetAfterTest(true);
+
+        $this->setAdminUser();
+        $course = self::getDataGenerator()->create_course();
+
+        $record = new stdClass();
+        $record->course = $course->id;
+        // One resource with one file.
+        $resource1 = self::getDataGenerator()->create_module('resource', $record);
+
+        $timenow = time();
+        // More type of files.
+        $record->files = file_get_unused_draft_itemid();
+        $usercontext = context_user::instance($USER->id);
+        $extensions = array('txt', 'png', 'pdf');
+        foreach ($extensions as $key => $extension) {
+            // Add actual file there.
+            $filerecord = array('component' => 'user', 'filearea' => 'draft',
+                    'contextid' => $usercontext->id, 'itemid' => $record->files,
+                    'filename' => 'resource' . $key . '.' . $extension, 'filepath' => '/');
+            $fs = get_file_storage();
+            $fs->create_file_from_string($filerecord, 'Test resource ' . $key . ' file');
+        }
+
+        $resource2 = self::getDataGenerator()->create_module('resource', $record);
+
+        $result = core_course_external::get_course_contents($course->id);
+        $result = external_api::clean_returnvalue(core_course_external::get_course_contents_returns(), $result);
+        $this->assertCount(2, $result[0]['modules']);
+        foreach ($result[0]['modules'] as $module) {
+            if ($module['instance'] == $resource1->id) {
+                $this->assertEquals(1, $module['contentsinfo']['filescount']);
+                $this->assertGreaterThanOrEqual($timenow, $module['contentsinfo']['lastmodified']);
+                $this->assertEquals($module['contents'][0]['filesize'], $module['contentsinfo']['filessize']);
+                $this->assertEquals(array('text/plain'), $module['contentsinfo']['mimetypes']);
+            } else {
+                $this->assertEquals(count($extensions), $module['contentsinfo']['filescount']);
+                $filessize = $module['contents'][0]['filesize'] + $module['contents'][1]['filesize'] +
+                    $module['contents'][2]['filesize'];
+                $this->assertEquals($filessize, $module['contentsinfo']['filessize']);
+                $this->assertGreaterThanOrEqual($timenow, $module['contentsinfo']['lastmodified']);
+                $this->assertEquals(array('text/plain', 'image/png', 'application/pdf'), $module['contentsinfo']['mimetypes']);
+            }
+        }
+    }
+
     /**
      * Test duplicate_course
      */
diff --git a/course/upgrade.txt b/course/upgrade.txt
index f23582e251b..efa1b2f604d 100644
--- a/course/upgrade.txt
+++ b/course/upgrade.txt
@@ -2,8 +2,10 @@ This files describes API changes in /course/*,
 information provided here is intended especially for developers.
 
 === 3.7 ===
+
  * External function core_course_external::get_course_contents new returns the following additional completiondata field:
    - valueused (indicates whether the completion state affects the availability of other content)
+ * External function core_course_external::get_course_contents now returns a new contentsinfo field with summary files information.
 
 === 3.6 ===