feat (frontend) : Add a download button

autograde-plugins/assignsubmission_autograde/src/download.php

+<?php
+
+require_once('../../../../config.php');
+require_once($CFG->dirroot . '/mod/assign/locallib.php');
+require_once('utils.php');
+
+use function assignsubmission_autograde\utils\assignsubmission_autograde_get_assignment;
+
+global $DB, $USER, $CFG;
+
+// Get the assignment ID from the request
+$assignmentid = required_param('id', PARAM_INT);
+
+$course_id = $DB->get_field('assign', 'course', array('id' =>$assignmentid));
+
+// HR : Check if the user has the necessary capabilities
+//require_capability('assignsubmission/autograde:exportsubmissions',
+  //  context_course::instance($course_id), $USER->id, false);
+
+// HR : Fetch the correct assignment instance
+$assignment = assignsubmission_autograde_get_assignment($assignmentid);
+
+// Check if group submissions are enabled
+$is_group_submission = $DB->get_field('assign', 'teamsubmission', ['id' => $assignmentid]);
+
+//Fetch the submissions from the DB
+$submissions = $is_group_submission ?
+    $DB->get_records_select(
+        'assign_submission',
+        'assignment = :assignmentid AND groupid != 0',
+        ['assignmentid' => $assignmentid]
+    ):
+    $DB->get_records('assign_submission', ['assignment' => $assignmentid]) ;
+
+
+if (empty($submissions)) {
+    throw new moodle_exception('nosubmissions', 'mod_assign');
+}
+
+
+$files_to_zip = [];
+foreach ($submissions as $submission){
+    $group_name = '';
+    if ($is_group_submission) {
+        // Handle group submissions
+        // Fetch group members
+        $group_members = $DB->get_records('groups_members', ['groupid' => $submission->groupid], '', 'userid');
+        if (empty($group_members)) {
+            throw new moodle_exception('invalidgroup', 'mod_assign', '', 'Group has no members.');
+        }
+
+        // Concatenate idnumbers of group members to create the group name
+        $group_idnumbers = [];
+        foreach ($group_members as $member) {
+            $user = $DB->get_record('user', ['id' => $member->userid], 'idnumber', MUST_EXIST);
+            $group_idnumbers[] = $user->idnumber;
+        }
+        $group_name = implode('_', $group_idnumbers); // Example: "idnumber1_idnumber2"
+    } else {
+        // Handle individual submissions
+        if (!empty($submission->userid)) {
+            $user = $DB->get_record('user', ['id' => $submission->userid], 'idnumber', MUST_EXIST);
+            $group_name = $user->idnumber;
+        } else {
+            throw new moodle_exception('invalidsubmission', 'mod_assign', '', 'Submission has no valid user or group ID.');
+        }
+    }
+
+    // HR : Retrieve the files associated with the specified area and item
+    $submission_files = array();
+    foreach ($assignment->get_submission_plugins() as $plugin){
+        if($plugin->is_enabled() && $plugin->is_visible() && $plugin->allow_submissions())
+            $submission_files += $plugin->get_files($submission, new stdClass());
+    }
+
+
+    foreach ($submission_files as $file) {
+        $filepath = $file->get_filepath();
+        $filename = $file->get_filename();
+        // We observed by looking in the $DB that the $filepath always starts and ends with
+        // '/'. If the filepath is empty, then it's the single character '/'
+        $files_to_zip[$group_name . '/' . $submission->attemptnumber . $filepath . $filename] = $file;
+    }
+
+}
+
+if (empty($files_to_zip)) {
+    throw new moodle_exception('nofiles', 'mod_assign');
+}
+
+//Prepare a temporary file for zipping
+$tempdir = make_temp_directory('submission_files') ;
+$zipfilename = "assignment_{$assignmentid}_submissions.zip" ;
+$tempzipfile = "$tempdir/$zipfilename" ;
+
+//Use Moodle's packer to create a zip file
+$packer = get_file_packer('application/zip') ;
+
+//Pack the files into the zip archive
+if (!$packer->archive_to_pathname($files_to_zip, $tempzipfile)) {
+    throw new moodle_exception('couldnotcreatezip');
+}
+
+//Send the zip file as a response using Moodle's API
+send_temp_file($tempzipfile, $zipfilename);
\ No newline at end of file

autograde-plugins/assignsubmission_autograde/src/locallib.php

@@ -209,7 +209,7 @@ final class assign_submission_autograde extends assign_submission_plugin
      * @return bool
      */
     public function is_empty(stdClass $submissionorgrade): bool {
-        return true;
+        return false;
     }
 
 
@@ -231,7 +231,7 @@ final class assign_submission_autograde extends assign_submission_plugin
                                                MoodleQuickForm $mform,
                                                stdClass $data,
                                                $userid): bool {
-        return false;
+        return true;
     }
 
     // ============================================================================================
@@ -304,7 +304,7 @@ final class assign_submission_autograde extends assign_submission_plugin
      * @return bool true to include in the summary, false otherwise
      */
     public function has_user_summary(): bool{
-        return false;
+        return true;
     }
 
     /**
@@ -316,7 +316,38 @@ final class assign_submission_autograde extends assign_submission_plugin
      * @return string ???
      */
     public function view_summary($submission, &$showviewlink): string {
-        return '';
+
+        global $PAGE, $USER, $DB;
+
+        // Get the assignment ID
+        $assignmentid = $submission->id;
+
+        // Get the course ID from the assignment
+        $courseid = $DB->get_field('assign', 'course', ['id' => $assignmentid]);
+
+        // Get the course context
+        $context = context_course::instance($courseid);
+
+        // Check if the user is a teacher (has grading capability)
+        if (!has_capability('mod/assign:grade', $context, $USER->id)) {
+            return ''; // Return empty string for students (no button displayed)
+        }
+
+
+
+        // Generate the URL for downloading all submissions
+        $url = new \moodle_url('/mod/assign/submission/autograde/download.php', ['id' => $assignmentid]);
+
+        // Get Moodle renderer
+        $this->output = $PAGE->get_renderer('mod_assign', null);
+
+        // Generate button HTML
+        $button = \html_writer::tag('a', '📥 Download all submissions', [
+            'href' => $url->out(false),
+            'class' => 'btn btn-primary',
+        ]);
+
+        return $button;
     }
 
     // ============================================================================================