Use gzdeflate/gzinflate to compress the course backup see BT#14425

main/coursecopy/create_backup.php

@@ -16,13 +16,13 @@ require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_COURSE_MAINTENANCE;
 
 api_protect_course_script(true);
-api_check_archive_dir();
 
 // Check access rights (only teachers are allowed here)
 if (!api_is_allowed_to_edit()) {
     api_not_allowed(true);
 }
 
+api_check_archive_dir();
 api_set_more_memory_and_time_limits();
 
 // Section for the tabs
@@ -53,7 +53,6 @@ if (Security::check_token('post') && (
 ) {
     // Clear token
     Security::clear_token();
-
     if (isset($_POST['action']) && $_POST['action'] == 'course_select_form') {
         $course = CourseSelectForm::get_posted_course();
     } else {
@@ -61,12 +60,14 @@ if (Security::check_token('post') && (
         $course = $cb->build();
     }
 
-    $zip_file = CourseArchiver::createBackup($course);
+    $zipFile = CourseArchiver::createBackup($course);
     echo Display::return_message(get_lang('BackupCreated'), 'confirm');
-    echo '<br />
-        <a class="btn btn-primary btn-large" 
-        href="'.api_get_path(WEB_CODE_PATH).'course_info/download.php?archive='.$zip_file.'&'.api_get_cidreq().'">
-    '.get_lang('Download').'</a>';
+    echo '<br />';
+    echo Display::url(
+        get_lang('Download'),
+        api_get_path(WEB_CODE_PATH).'course_info/download.php?archive='.$zipFile.'&'.api_get_cidreq(),
+        ['class' => 'btn btn-primary btn-large']
+    );
 } elseif (Security::check_token('post') && (
         isset($_POST['backup_option']) &&
         $_POST['backup_option'] == 'select_items'
@@ -74,17 +75,15 @@ if (Security::check_token('post') && (
 ) {
     // Clear token
     Security::clear_token();
-
     $cb = new CourseBuilder('partial');
     $course = $cb->build();
+    if ($course->has_resources()) {
         // Add token to Course select form
         $hiddenFields['sec_token'] = Security::get_token();
         CourseSelectForm::display_form($course, $hiddenFields);
     } else {
-    $cb = new CourseBuilder();
-    $course = $cb->build();
-    if (!$course->has_resources()) {
-        echo get_lang('NoResourcesToBackup');
+        echo Display::return_message(get_lang('NoResourcesToBackup'), 'warning');
+    }
 } else {
     $form = new FormValidator(
         'create_backup_form',
@@ -121,6 +120,5 @@ if (Security::check_token('post') && (
     echo '</div>';
     echo '</div>';
 }
-}
 
 Display::display_footer();

src/Chamilo/CourseBundle/Component/CourseCopy/Course.php

@@ -340,10 +340,20 @@ class Course
     public static function serialize($course)
     {
         if (extension_loaded('igbinary')) {
-            return igbinary_serialize($course);
+            $serialized = igbinary_serialize($course);
         } else {
-            return serialize($course);
+            $serialized = serialize($course);
         }
+
+        // Compress
+        if (function_exists('gzdeflate')) {
+            $deflated = gzdeflate($serialized, 9);
+            if ($deflated !== false) {
+                $deflated = $serialized;
+            }
+        }
+
+        return $serialized;
     }
 
     /**
@@ -355,10 +365,20 @@ class Course
      */
     public static function unserialize($course)
     {
+        // Uncompress
+        if (function_exists('gzdeflate')) {
+            $inflated = @gzinflate($course);
+            if ($inflated !== false) {
+                $course = $inflated;
+            }
+        }
+
         if (extension_loaded('igbinary')) {
-            return igbinary_unserialize($course);
+            $unserialized = igbinary_unserialize($course);
         } else {
-            return unserialize($course);
+            $unserialized = unserialize($course);
         }
+
+        return $unserialized;
     }
 }

src/Chamilo/CourseBundle/Component/CourseCopy/CourseSelectForm.php

@@ -333,7 +333,10 @@ class CourseSelectForm
             $course->resources['document'] = null;
         }
 
-        echo '<input type="hidden" name="course" value="'.base64_encode(Course::serialize($course)).'"/>';
+        /** @var Course $course */
+        $courseSerialized = base64_encode(Course::serialize($course));
+
+        echo '<input type="hidden" name="course" value="'.$courseSerialized.'"/>';
         if (is_array($hidden_fields)) {
             foreach ($hidden_fields as $key => $value) {
                 echo '<input type="hidden" name="'.$key.'" value="'.$value.'"/>';