Course protected images feature

lang/en/certificate.php

@@ -118,6 +118,10 @@
 $string['gradepercent'] = 'Percentage Grade';
 $string['gradepoints'] = 'Points Grade';
 $string['imagetype'] = 'Image Type';
+$string['protected'] = 'Limit to one course';
+$string['courseshortname'] = 'Course shortname';
+$string['novalidcourseshortname'] = 'Course shortname is not valid. There is not a course with this shortname. Please check.';
+$string['missingcourseshortname'] = 'Please specify the course shortname.';
 $string['incompletemessage'] = 'In order to download your certificate, you must first complete all required '.'activities. Please return to the course to complete your coursework.';
 $string['intro'] = 'Introduction';
 $string['issueoptions'] = 'Issue Options';
@@ -201,4 +205,4 @@
 $string['viewcertificateviews'] = 'View {$a} issued certificates';
 $string['viewed'] = 'You received this certificate on:';
 $string['viewtranscript'] = 'View Certificates';
-$string['watermark'] = 'Watermark';
+$string['watermark'] = 'Watermark';

lib.php

@@ -1043,11 +1043,14 @@ function certificate_get_images($type) {
             $uploadpath = "$CFG->dataroot/mod/certificate/pix/watermarks";
             break;
     }
+
     // If valid path
     if (!empty($path)) {
         $options = array();
         $options += certificate_scan_image_dir($path);
         $options += certificate_scan_image_dir($uploadpath);
+		// add course protected files
+        $options += certificate_scan_image_protected_dir($uploadpath);
 
         // Sort images
         ksort($options);
@@ -1513,3 +1516,37 @@ function certificate_scan_image_dir($path) {
     }
     return $options;
 }
+
+/**
+ * Scans the protected directory "$path/course/$COURSE->shortname" for valid images.
+ * The images in protected directory are only visible from the course with the same shortname.
+ *
+ * @param string the path
+ * @return array
+ */
+function certificate_scan_image_protected_dir($path) {
+	global $COURSE;
+
+	$protecteddir = "/course/$COURSE->shortname/";
+	$protectedpath = $path.$protecteddir;
+    // Array to store the images
+    $options = array();
+
+    // Start to scan directory
+    if (is_dir($protectedpath)) {
+        if ($handle = opendir($protectedpath)) {
+            while (false !== ($file = readdir($handle))) {
+                if (strpos($file, '.png', 1) || strpos($file, '.jpg', 1) ) {
+                    $i = strpos($file, '.');
+                    if ($i > 1) {
+                        // Set the name
+                        $options[$protecteddir.$file] = substr($file, 0, $i);
+                    }
+                }
+            }
+            closedir($handle);
+        }
+    }
+
+    return $options;
+}

upload_image.php

@@ -48,9 +48,13 @@
 if ($upload_form->is_cancelled()) {
     redirect(new moodle_url('/admin/settings.php?section=modsettingcertificate'));
 } else if ($data = $upload_form->get_data()) {
-    // Ensure the directory for storing is created
-    $uploaddir = "mod/certificate/pix/$data->imagetype";
     $filename = $upload_form->get_new_filename('certificateimage');
+    $uploaddir = "mod/certificate/pix/$data->imagetype";
+	// put the file inside a protected directory if needed
+	if(isset($data->protected)) {
+		$uploaddir .= "/course/$data->courseshortname/";
+	}
+    // Ensure the directory for storing is created
     make_upload_directory($uploaddir);
     $destination = $CFG->dataroot . '/' . $uploaddir . '/' . $filename;
     if (!$upload_form->save_file('certificateimage', $destination, true)) {

upload_image_form.php

@@ -46,6 +46,8 @@ function definition() {
         );
 
         $mform->addElement('select', 'imagetype', get_string('imagetype', 'certificate'), $imagetypes);
+        $mform->addElement('checkbox', 'protected', get_string('protected', 'certificate'));
+        $mform->addElement('text', 'courseshortname', get_string('courseshortname', 'certificate'));
 
         $mform->addElement('filepicker', 'certificateimage', '');
         $mform->addRule('certificateimage', null, 'required', null, 'client');
@@ -79,6 +81,20 @@ function validation($data, $files) {
             $errors['certificateimage'] = get_string('nofileselected', 'certificate');
         }
 
-        return $errors;
+		// check course shortname data
+		if(isset($data['protected'])) {
+			// check if shortname is set and not empty
+			if(!isset($data['courseshortname']) or empty($data['courseshortname'])) {
+				$errors['courseshortname'] = get_string('missingcourseshortname', 'certificate');
+			} else { // check if shortname is a valid one
+				global $DB;
+				$course = $DB->get_record('course', array('shortname'=>$data['courseshortname']));
+				if($course == false){
+					$errors['courseshortname'] = get_string('novalidcourseshortname', 'certificate');
+				}
+			}
+		}
+
+		return $errors;
     }
-}
+}