/**
  * Constructor for the plugin. In addition to calling the parent
  * constructor, we define and 'fix' some settings depending on the
  * real settings the admin defined.
  */
 public function __construct()
 {
     global $CFG;
     require_once $CFG->libdir . '/ldaplib.php';
     // Do our own stuff to fix the config (it's easier to do it
     // here than using the admin settings infrastructure). We
     // don't call $this->set_config() for any of the 'fixups'
     // (except the objectclass, as it's critical) because the user
     // didn't specify any values and relied on the default values
     // defined for the user type she chose.
     $this->load_config();
     // Make sure we get sane defaults for critical values.
     $this->config->ldapencoding = $this->get_config('ldapencoding', 'utf-8');
     $this->config->user_type = $this->get_config('user_type', 'default');
     $ldap_usertypes = ldap_supported_usertypes();
     $this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
     unset($ldap_usertypes);
     $default = ldap_getdefaults();
     // Remove the objectclass default, as the values specified there are for
     // users, and we are dealing with groups here.
     unset($default['objectclass']);
     // Use defaults if values not given. Dont use this->get_config()
     // here to be able to check for 0 and false values too.
     foreach ($default as $key => $value) {
         // Watch out - 0, false are correct values too, so we can't use $this->get_config()
         if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
             $this->config->{$key} = $value[$this->config->user_type];
         }
     }
     if (empty($this->config->objectclass)) {
         // Can't send empty filter. Fix it for now and future occasions
         $this->set_config('objectclass', '(objectClass=*)');
     } else {
         if (stripos($this->config->objectclass, 'objectClass=') === 0) {
             // Value is 'objectClass=some-string-here', so just add ()
             // around the value (filter _must_ have them).
             // Fix it for now and future occasions
             $this->set_config('objectclass', '(' . $this->config->objectclass . ')');
         } else {
             if (stripos($this->config->objectclass, '(') !== 0) {
                 // Value is 'some-string-not-starting-with-left-parentheses',
                 // which is assumed to be the objectClass matching value.
                 // So build a valid filter with it.
                 $this->set_config('objectclass', '(objectClass=' . $this->config->objectclass . ')');
             } else {
                 // There is an additional possible value
                 // '(some-string-here)', that can be used to specify any
                 // valid filter string, to select subsets of users based
                 // on any criteria. For example, we could select the users
                 // whose objectClass is 'user' and have the
                 // 'enabledMoodleUser' attribute, with something like:
                 //
                 //   (&(objectClass=user)(enabledMoodleUser=1))
                 //
                 // In this particular case we don't need to do anything,
                 // so leave $this->config->objectclass as is.
             }
         }
     }
 }

 /**
  * Init plugin config from database settings depending on the plugin auth type.
  */
 function init_plugin($authtype)
 {
     $this->pluginconfig = 'auth/' . $authtype;
     $this->config = get_config($this->pluginconfig);
     if (empty($this->config->ldapencoding)) {
         $this->config->ldapencoding = 'utf-8';
     }
     if (empty($this->config->user_type)) {
         $this->config->user_type = 'default';
     }
     $ldap_usertypes = ldap_supported_usertypes();
     $this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
     unset($ldap_usertypes);
     $default = ldap_getdefaults();
     // Use defaults if values not given
     foreach ($default as $key => $value) {
         // watch out - 0, false are correct values too
         if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
             $this->config->{$key} = $value[$this->config->user_type];
         }
     }
     // Hack prefix to objectclass
     if (empty($this->config->objectclass)) {
         // Can't send empty filter
         $this->config->objectclass = '(objectClass=*)';
     } else {
         if (stripos($this->config->objectclass, 'objectClass=') === 0) {
             // Value is 'objectClass=some-string-here', so just add ()
             // around the value (filter _must_ have them).
             $this->config->objectclass = '(' . $this->config->objectclass . ')';
         } else {
             if (strpos($this->config->objectclass, '(') !== 0) {
                 // Value is 'some-string-not-starting-with-left-parentheses',
                 // which is assumed to be the objectClass matching value.
                 // So build a valid filter with it.
                 $this->config->objectclass = '(objectClass=' . $this->config->objectclass . ')';
             } else {
                 // There is an additional possible value
                 // '(some-string-here)', that can be used to specify any
                 // valid filter string, to select subsets of users based
                 // on any criteria. For example, we could select the users
                 // whose objectClass is 'user' and have the
                 // 'enabledMoodleUser' attribute, with something like:
                 //
                 //   (&(objectClass=user)(enabledMoodleUser=1))
                 //
                 // In this particular case we don't need to do anything,
                 // so leave $this->config->objectclass as is.
             }
         }
     }
 }

 /**
  * Constructor for the plugin. In addition to calling the parent
  * constructor, we define and 'fix' some settings depending on the
  * real settings the admin defined.
  */
 public function __construct()
 {
     global $CFG;
     require_once $CFG->libdir . '/ldaplib.php';
     // Do our own stuff to fix the config (it's easier to do it
     // here than using the admin settings infrastructure). We
     // don't call $this->set_config() for any of the 'fixups'
     // (except the objectclass, as it's critical) because the user
     // didn't specify any values and relied on the default values
     // defined for the user type she chose.
     $this->load_config();
     // Make sure we get sane defaults for critical values.
     $this->config->ldapencoding = $this->get_config('ldapencoding', 'utf-8');
     $this->config->user_type = $this->get_config('user_type', 'default');
     $ldap_usertypes = ldap_supported_usertypes();
     $this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
     unset($ldap_usertypes);
     $default = ldap_getdefaults();
     // The objectclass in the defaults is for a user.
     // This will be required later, but enrol_ldap uses 'objectclass' for its group objectclass.
     // Save the normalised user objectclass for later.
     $this->userobjectclass = ldap_normalise_objectclass($default['objectclass'][$this->get_config('user_type')]);
     // Remove the objectclass default, as the values specified there are for users, and we are dealing with groups here.
     unset($default['objectclass']);
     // Use defaults if values not given. Dont use this->get_config()
     // here to be able to check for 0 and false values too.
     foreach ($default as $key => $value) {
         // Watch out - 0, false are correct values too, so we can't use $this->get_config()
         if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
             $this->config->{$key} = $value[$this->config->user_type];
         }
     }
     // Normalise the objectclass used for groups.
     if (empty($this->config->objectclass)) {
         // No objectclass set yet - set a default class.
         $this->config->objectclass = ldap_normalise_objectclass(null, '*');
         $this->set_config('objectclass', $this->config->objectclass);
     } else {
         $objectclass = ldap_normalise_objectclass($this->config->objectclass);
         if ($objectclass !== $this->config->objectclass) {
             // The objectclass was changed during normalisation.
             // Save it in config, and update the local copy of config.
             $this->set_config('objectclass', $objectclass);
             $this->config->objectclass = $objectclass;
         }
     }
 }

 $settings->add(new admin_setting_heading('enrol_ldap_bind_settings', get_string('bind_settings', 'enrol_ldap'), ''));
 $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/bind_dn', get_string('bind_dn_key', 'enrol_ldap'), get_string('bind_dn', 'enrol_ldap'), ''));
 $settings->add(new admin_setting_configpasswordunmask('enrol_ldap/bind_pw', get_string('bind_pw_key', 'enrol_ldap'), get_string('bind_pw', 'enrol_ldap'), ''));
 //--- role mapping settings ---
 $settings->add(new admin_setting_heading('enrol_ldap_roles', get_string('roles', 'enrol_ldap'), ''));
 if (!during_initial_install()) {
     $settings->add(new admin_setting_ldap_rolemapping('enrol_ldap/role_mapping', get_string('role_mapping_key', 'enrol_ldap'), get_string('role_mapping', 'enrol_ldap'), ''));
 }
 $options = $yesno;
 $settings->add(new admin_setting_configselect('enrol_ldap/course_search_sub', get_string('course_search_sub_key', 'enrol_ldap'), get_string('course_search_sub', 'enrol_ldap'), 0, $options));
 $options = $yesno;
 $settings->add(new admin_setting_configselect('enrol_ldap/memberattribute_isdn', get_string('memberattribute_isdn_key', 'enrol_ldap'), get_string('memberattribute_isdn', 'enrol_ldap'), 0, $options));
 $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/user_contexts', get_string('user_contexts_key', 'enrol_ldap'), get_string('user_contexts', 'enrol_ldap'), ''));
 $options = $yesno;
 $settings->add(new admin_setting_configselect('enrol_ldap/user_search_sub', get_string('user_search_sub_key', 'enrol_ldap'), get_string('user_search_sub', 'enrol_ldap'), 0, $options));
 $options = ldap_supported_usertypes();
 $settings->add(new admin_setting_configselect('enrol_ldap/user_type', get_string('user_type_key', 'enrol_ldap'), get_string('user_type', 'enrol_ldap'), 'default', $options));
 $options = array();
 $options[LDAP_DEREF_NEVER] = get_string('no');
 $options[LDAP_DEREF_ALWAYS] = get_string('yes');
 $settings->add(new admin_setting_configselect('enrol_ldap/opt_deref', get_string('opt_deref_key', 'enrol_ldap'), get_string('opt_deref', 'enrol_ldap'), 0, $options));
 $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/idnumber_attribute', get_string('idnumber_attribute_key', 'enrol_ldap'), get_string('idnumber_attribute', 'enrol_ldap'), '', true, true));
 //--- course mapping settings ---
 $settings->add(new admin_setting_heading('enrol_ldap_course_settings', get_string('course_settings', 'enrol_ldap'), ''));
 $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/objectclass', get_string('objectclass_key', 'enrol_ldap'), get_string('objectclass', 'enrol_ldap'), ''));
 $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/course_idnumber', get_string('course_idnumber_key', 'enrol_ldap'), get_string('course_idnumber', 'enrol_ldap'), '', true, true));
 $coursefields = array('shortname', 'fullname', 'summary');
 foreach ($coursefields as $field) {
     $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/course_' . $field, get_string('course_' . $field . '_key', 'enrol_ldap'), get_string('course_' . $field, 'enrol_ldap'), '', true, true));
 }
 $settings->add(new admin_setting_configcheckbox('enrol_ldap/ignorehiddencourses', get_string('ignorehiddencourses', 'enrol_database'), get_string('ignorehiddencourses_desc', 'enrol_database'), 0));

 /**
  * Init plugin config from database settings depending on the plugin auth type.
  */
 function init_plugin($authtype)
 {
     $this->pluginconfig = 'auth/' . $authtype;
     $this->config = get_config($this->pluginconfig);
     if (empty($this->config->ldapencoding)) {
         $this->config->ldapencoding = 'utf-8';
     }
     if (empty($this->config->user_type)) {
         $this->config->user_type = 'default';
     }
     $ldap_usertypes = ldap_supported_usertypes();
     $this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
     unset($ldap_usertypes);
     $default = ldap_getdefaults();
     // Use defaults if values not given
     foreach ($default as $key => $value) {
         // watch out - 0, false are correct values too
         if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
             $this->config->{$key} = $value[$this->config->user_type];
         }
     }
     // Hack prefix to objectclass
     $this->config->objectclass = ldap_normalise_objectclass($this->config->objectclass);
 }