MDL-45849 enrol_self: Added self enrol capability

enrol/self/db/access.php

@@ -73,4 +73,13 @@
         )
     ),
 
+    /* Ability to enrol self in courses. */
+    'enrol/self:enrolself' => array(
+        'captype' => 'write',
+        'contextlevel' => CONTEXT_COURSE,
+        'archetypes' => array(
+            'user' => CAP_ALLOW,
+        )
+    ),
+
 );

enrol/self/lang/en/enrol_self.php

@@ -98,6 +98,7 @@
 $string['requirepassword_desc'] = 'Require enrolment key in new courses and prevent removing of enrolment key from existing courses.';
 $string['role'] = 'Default assigned role';
 $string['self:config'] = 'Configure self enrol instances';
+$string['self:enrolself'] = 'Self enrol in course';
 $string['self:holdkey'] = 'Appear as the self enrolment key holder';
 $string['self:manage'] = 'Manage enrolled users';
 $string['self:unenrol'] = 'Unenrol users from course';

enrol/self/lib.php

@@ -248,6 +248,11 @@ public function can_self_enrol(stdClass $instance, $checkuserenrolment = true) {
             return get_string('canntenrol', 'enrol_self');
         }
 
+        // Check if user has the capability to enrol in this context.
+        if (!has_capability('enrol/self:enrolself', context_course::instance($instance->courseid))) {
+            return get_string('canntenrol', 'enrol_self');
+        }
+
         if ($instance->enrolstartdate != 0 and $instance->enrolstartdate > time()) {
             return get_string('canntenrolearly', 'enrol_self', userdate($instance->enrolstartdate));
         }

enrol/self/version.php

@@ -24,6 +24,6 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2020061500;        // The current plugin version (Date: YYYYMMDDXX)
+$plugin->version   = 2020061501;        // The current plugin version (Date: YYYYMMDDXX)
 $plugin->requires  = 2020060900;        // Requires this Moodle version
 $plugin->component = 'enrol_self';      // Full name of the plugin (used for diagnostics)