access_filter.admin.inc in Access Filter 7
Administration pages for access filters.
File
access_filter.admin.incView source
<?php
/**
* @file
* Administration pages for access filters.
*/
/**
* Form builder to list and manage filters.
*
* @ingroup forms
* @see access_filter_overview_filters_submit()
* @see theme_access_filter_overview_filters()
*/
function access_filter_overview_filters($form) {
global $conf, $_access_filter_fast_mode_enabled;
if (!empty($conf['access_filter_disabled'])) {
drupal_set_message(t('Access filter module is disabled in settings.php.', 'warning'));
return;
}
$process_types = array(
ACCESS_FILTER_PROCESS_TYPE_DENY => t('Deny from'),
ACCESS_FILTER_PROCESS_TYPE_ALLOW => t('Allow from'),
);
$action_types = array(
ACCESS_FILTER_DENY_ACTION_403 => t('Error') . ': 403 Forbidden',
ACCESS_FILTER_DENY_ACTION_404 => t('Error') . ': 404 Not Found',
ACCESS_FILTER_DENY_ACTION_301 => t('Redirect') . ': 301 Moved Permanently',
ACCESS_FILTER_DENY_ACTION_302 => t('Redirect') . ': 302 Moved Temporarily',
ACCESS_FILTER_DENY_ACTION_200 => '200 OK',
);
$form['#tree'] = TRUE;
$filters = access_filter_load_all();
foreach ($filters as $filter) {
$form[$filter->fid]['#filter'] = $filter;
$form[$filter->fid]['enabled'] = array(
'#markup' => check_plain($filter->status >= ACCESS_FILTER_STATUS_ENABLED) ? 'o' : 'x',
);
$form[$filter->fid]['name'] = array(
'#markup' => check_plain($filter->name),
);
$paths_markup = '<ul>';
foreach ($filter->parsed_paths as $parsed) {
$type_text = $parsed->is_uri ? t('Request uri') : t('Drupal path');
$modifier_texts = array();
if ($parsed->is_regex) {
$modifier_texts[] = t('regex');
}
if ($parsed->is_blind) {
$modifier_texts[] = t('blind');
}
if (!empty($modifier_texts)) {
$type_text .= ' (' . implode(', ', $modifier_texts) . ')';
}
$paths_markup .= '<li>' . check_plain($parsed->pattern) . ' <i>#' . check_plain($type_text) . '</i></li>';
}
$paths_markup .= '</ul>';
$form[$filter->fid]['paths'] = array(
'#markup' => $paths_markup,
);
$rules_markup = '<ol>';
foreach (explode("\n", $filter->rules) as $line) {
$line = trim($line);
if (strlen($line)) {
list($type, $ip) = explode(':', $line, 2);
$rules_markup .= '<li>' . check_plain($process_types[$type] . ' ' . $ip) . '</li>';
}
}
$rules_markup .= '</ol>';
$form[$filter->fid]['rules'] = array(
'#markup' => $rules_markup,
);
$deny_action_markup = '<ul>';
if ($filter->deny_action_settings->type == ACCESS_FILTER_DENY_ACTION_301 || $filter->deny_action_settings->type == ACCESS_FILTER_DENY_ACTION_302) {
$deny_action_markup .= '<li>' . $action_types[$filter->deny_action_settings->type] . '<br />' . $filter->deny_action_settings->redirect_destination . '</li>';
}
else {
$deny_action_markup .= '<li>' . $action_types[$filter->deny_action_settings->type] . '</li>';
}
if ($filter->deny_action_settings->force_logout) {
$deny_action_markup .= '<li>' . t('Force logout') . '</li>';
}
$deny_action_markup .= '</ul>';
$form[$filter->fid]['action'] = array(
'#markup' => $deny_action_markup,
);
$form[$filter->fid]['weight'] = array(
'#type' => 'textfield',
'#title' => t('Weight for @title', array(
'@title' => $filter->name,
)),
'#title_display' => 'invisible',
'#delta' => 10,
'#size' => 3,
'#default_value' => $filter->weight,
);
$form[$filter->fid]['edit'] = array(
'#type' => 'link',
'#title' => t('edit'),
'#href' => "admin/config/people/access_filter/{$filter->fid}/edit",
);
$form[$filter->fid]['delete'] = array(
'#type' => 'link',
'#title' => t('delete'),
'#href' => "admin/config/people/access_filter/{$filter->fid}/delete",
);
}
if (count($filters) > 1) {
$form['actions'] = array(
'#type' => 'actions',
);
$form['actions']['submit'] = array(
'#type' => 'submit',
'#value' => t('Save'),
);
}
elseif (isset($filter)) {
unset($form[$filter->fid]['weight']);
}
if ($_access_filter_fast_mode_enabled) {
if ($conf['access_filter_fast'] != access_filter_build_fast($filters)) {
drupal_set_message('Fast mode is enabled and some filter(s) are changed. Changes does not apply until modify settings.php.', 'warning');
}
else {
drupal_set_message('Fast mode is enabled. Changes does not apply until modify settings.php.', 'warning');
}
}
return $form;
}
/**
* Returns HTML for the access filter overview form as a list of filters.
*
* @param array $variables
* An associative array containing:
* - form: A render element representing the form.
*
* @see access_filter_overview_filters()
* @ingroup themeable
*/
function theme_access_filter_overview_filters($variables) {
$form = $variables['form'];
$rows = array();
foreach (element_children($form) as $key) {
if (isset($form[$key]['name'])) {
$filter =& $form[$key];
$row = array();
$row[] = drupal_render($filter['enabled']);
$row[] = drupal_render($filter['name']);
$row[] = drupal_render($filter['paths']);
$row[] = drupal_render($filter['rules']);
$row[] = drupal_render($filter['action']);
if (isset($filter['weight'])) {
$filter['weight']['#attributes']['class'] = array(
'access-filter-weight',
);
$row[] = drupal_render($filter['weight']);
}
$row[] = drupal_render($filter['edit']);
$row[] = drupal_render($filter['delete']);
$rows[] = array(
'data' => $row,
'class' => array(
'draggable',
),
);
}
}
$header = array(
t('Enabled'),
t('Name'),
t('Paths'),
t('Rules'),
t('Actions On deny'),
);
if (isset($form['actions'])) {
$header[] = t('Weight');
drupal_add_tabledrag('access-filter', 'order', 'sibling', 'access-filter-weight');
}
$header[] = array(
'data' => t('Operations'),
'colspan' => '2',
);
$markup = theme('table', array(
'header' => $header,
'rows' => $rows,
'empty' => t('No filters available. <a href="@link">Add filter</a>.', array(
'@link' => url('admin/config/people/access_filter/add'),
)),
'attributes' => array(
'id' => 'access-filter',
),
));
return $markup . drupal_render_children($form);
}
/**
* Form submission handler for access_filter_overview_filters().
*
* @see access_filter_overview_filters()
*/
function access_filter_overview_filters_submit($form, &$form_state) {
foreach ($form_state['values'] as $fid => $filter) {
if (is_numeric($fid) && $form[$fid]['#filter']->weight != $filter['weight']) {
$form[$fid]['#filter']->weight = $filter['weight'];
access_filter_save($form[$fid]['#filter']);
}
}
drupal_set_message(t('The configuration options have been saved.'));
}
/**
* Form builder for the filter fast settings form.
*/
function access_filter_form_fast($form) {
$filters = access_filter_load_all();
$form['dump'] = array(
'#type' => 'textarea',
'#value' => "\$conf['access_filter_fast'] = '" . access_filter_build_fast($filters) . "';",
'#attributes' => array(
'readonly' => 'readonly',
),
'#prefix' => '<div>' . t('To enable fast mode, add below line(s) into settings.php.') . '</div>',
);
return $form;
}
/**
* Serialize filters for fast mode.
*
* @param array $filters
* An array of filter object.
*
* @return string
* A string of serialized filters.
*/
function access_filter_build_fast($filters) {
foreach ($filters as $i => $filter) {
if ($filter->status == ACCESS_FILTER_STATUS_ENABLED) {
// Remove useless properties.
unset($filter->fid, $filter->name, $filter->status, $filter->weight);
}
else {
unset($filters[$i]);
}
}
return serialize($filters);
}
/**
* Form builder for the filter editing form.
*
* @ingroup forms
* @see access_filter_form_filter_submit()
* @see access_filter_form_filter_validate()
*/
function access_filter_form_filter($form, &$form_state, $filter = NULL) {
if (!isset($form_state['term'])) {
$defaults = array(
'status' => ACCESS_FILTER_STATUS_ENABLED,
'name' => '',
'is_strict' => TRUE,
'paths' => '',
'rules' => '',
'deny_action_settings' => (object) array(
'type' => ACCESS_FILTER_DENY_ACTION_403,
'error_message' => array(
'value' => '',
'format' => NULL,
),
'redirect_destination' => '',
'force_logout' => FALSE,
),
'weight' => 0,
);
if (!$filter) {
$filter = new stdClass();
}
foreach ($defaults as $key => $value) {
if (!isset($filter->{$key})) {
$filter->{$key} = $value;
}
elseif (is_object($value)) {
foreach ((array) $value as $sub_key => $sub_value) {
if (!isset($filter->{$key}->{$sub_key})) {
$filter->{$key}->{$sub_key} = $sub_value;
}
}
}
}
$form_state['filter'] = $filter;
}
else {
$filter = $form_state['filter'];
}
if (isset($filter->fid)) {
$form['vid'] = array(
'#type' => 'value',
'#value' => $filter->fid,
);
}
$form['basics'] = array(
'#type' => 'fieldset',
'#title' => t('Basics'),
);
$form['basics']['status'] = array(
'#type' => 'checkbox',
'#title' => t('Enabled'),
'#default_value' => $filter->status,
);
$form['basics']['name'] = array(
'#type' => 'textfield',
'#title' => t('Name'),
'#default_value' => $filter->name,
);
$form['path'] = array(
'#type' => 'fieldset',
'#title' => 'Paths',
);
$form['path']['paths'] = array(
'#type' => 'textarea',
'#default_value' => $filter->paths,
);
$form['path']['paths']['#description'] = '<div>' . t('Enter one path per line.') . '</div>';
$form['path']['paths']['#description'] .= '<div>' . t('Format: %format', array(
'%format' => t('Type[+Modifiers,...]:Pattern'),
)) . '</div>';
$form['path']['paths']['#description'] .= '<div>' . t('Types:') . '</div>';
$form['path']['paths']['#description'] .= '<ul>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . ' = ' . t('Drupal path') . '</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_URI . ' = ' . t('Request uri (contains parameters)') . '</li>';
$form['path']['paths']['#description'] .= '</ul>';
$form['path']['paths']['#description'] .= '<div>' . t('Modifiers:') . '</div>';
$form['path']['paths']['#description'] .= '<ul>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_MODIFIER_REGEX . ' = ' . t('Use regex') . '</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_MODIFIER_BLIND . ' = ' . t('Blind mode (disable looking up aliases)') . '</li>';
$form['path']['paths']['#description'] .= '</ul>';
$form['path']['paths']['#description'] .= '<div>' . t('Exapmles:') . '</div>';
$form['path']['paths']['#description'] .= '<ul>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . ':<front> <i>' . t('# Front page') . '</i></li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . ':<admin> <i>' . t('# Admin paths') . '</i></li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . ':admin/config/people/access_filter/*</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . '+' . ACCESS_FILTER_PATH_MODIFIER_BLIND . ':node/3</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . '+' . ACCESS_FILTER_PATH_MODIFIER_REGEX . ACCESS_FILTER_PATH_MODIFIER_BLIND . ':^node/[123]$</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_DRUPAL . '+' . ACCESS_FILTER_PATH_MODIFIER_REGEX . ':^admin\\/config\\/people\\/access_filter\\/[0-9]+\\/edit$</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_URI . ':admin/config/people/access_filter</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_URI . ':admin/config/people/access_filter?mode=sample&type=1</li>';
$form['path']['paths']['#description'] .= ' <li>' . ACCESS_FILTER_PATH_TYPE_URI . '+' . ACCESS_FILTER_PATH_MODIFIER_REGEX . ':^admin\\/config\\/people\\/access_filter\\?mode=(ex1|ex2)</li>';
$form['path']['paths']['#description'] .= '</ul>';
$form['rule'] = array(
'#type' => 'fieldset',
'#title' => t('Rules'),
);
$form['rule']['rules'] = array(
'#type' => 'textarea',
'#default_value' => $filter->rules,
);
$form['rule']['rules']['#description'] = '<div>' . t('Enter one rule per line.') . '</div>';
$form['rule']['rules']['#description'] .= '<div>' . t('Format: %format', array(
'%format' => t('Process type:IP address'),
)) . '</div>';
$form['rule']['rules']['#description'] .= '<div>' . t('Process types:') . '</div>';
$form['rule']['rules']['#description'] .= '<ul>';
$form['rule']['rules']['#description'] .= ' <li>' . ACCESS_FILTER_PROCESS_TYPE_DENY . ' = ' . t('Deny') . '</li>';
$form['rule']['rules']['#description'] .= ' <li>' . ACCESS_FILTER_PROCESS_TYPE_ALLOW . ' = ' . t('Allow') . '</li>';
$form['rule']['rules']['#description'] .= '</ul>';
$form['rule']['rules']['#description'] .= '<div>' . t("'*' is matches any IP addresses.") . '</div>';
$form['rule']['rules']['#description'] .= '<div>' . t('Exapmles:') . '</div>';
$form['rule']['rules']['#description'] .= '<div>' . t('Allow from only @allowed except @denied.', array(
'@allowed' => '192.168.0.0/24',
'@denied' => '192.168.0.10-192.168.0.20',
)) . '</div>';
$form['rule']['rules']['#description'] .= '<ul>';
$form['rule']['rules']['#description'] .= ' <li>' . ACCESS_FILTER_PROCESS_TYPE_DENY . ':*</li>';
$form['rule']['rules']['#description'] .= ' <li>' . ACCESS_FILTER_PROCESS_TYPE_ALLOW . ':192.168.0.0/24</li>';
$form['rule']['rules']['#description'] .= ' <li>' . ACCESS_FILTER_PROCESS_TYPE_DENY . ':192.168.0.10-192.168.0.20</li>';
$form['rule']['rules']['#description'] .= '</ul>';
$form['deny_action_settings'] = array(
'#type' => 'fieldset',
'#title' => t('On deny'),
'#tree' => TRUE,
);
$form['deny_action_settings']['type'] = array(
'#type' => 'select',
'#title' => t('Response'),
'#options' => array(
ACCESS_FILTER_DENY_ACTION_403 => t('Error') . ': 403 Access Forbidden',
ACCESS_FILTER_DENY_ACTION_404 => t('Error') . ': 404 Not Found',
ACCESS_FILTER_DENY_ACTION_301 => t('Redirect') . ': 301 Moved Permanently',
ACCESS_FILTER_DENY_ACTION_302 => t('Redirect') . ': 302 Moved Temporarily',
ACCESS_FILTER_DENY_ACTION_200 => '200 OK',
),
'#default_value' => $filter->deny_action_settings->type,
);
$form['deny_action_settings']['error_message'] = array(
'#type' => 'text_format',
'#title' => t('Error message'),
'#default_value' => $filter->deny_action_settings->error_message['value'],
'#format' => $filter->deny_action_settings->error_message['format'],
);
$form['deny_action_settings']['redirect_destination'] = array(
'#type' => 'textfield',
'#title' => t('Redirect URL'),
'#default_value' => $filter->deny_action_settings->redirect_destination,
);
$form['deny_action_settings']['force_logout'] = array(
'#type' => 'checkbox',
'#title' => t('Force logout'),
'#default_value' => $filter->deny_action_settings->force_logout,
);
$form['actions'] = array(
'#type' => 'actions',
);
$form['actions']['submit'] = array(
'#type' => 'submit',
'#value' => t('Save'),
);
$form['actions']['back'] = array(
'#type' => 'submit',
'#value' => t('Back'),
);
$form['#validate'][] = 'access_filter_form_filter_validate';
$form['test'] = array(
'#type' => 'fieldset',
'#title' => t('Test'),
'#weight' => 1000,
);
$form['test']['test_result'] = array(
'#type' => 'markup',
'#markup' => '<div id="test-result"></div>',
);
$form['test']['test_path'] = array(
'#type' => 'textfield',
'#title' => t('Path/URL'),
'#field_prefix' => 'http://' . $_SERVER['HTTP_HOST'] . '/',
'#default_value' => current_path(),
);
$form['test']['test_ip'] = array(
'#type' => 'textfield',
'#title' => t('IP address'),
'#size' => 15,
'#default_value' => ip_address(),
);
$form['test']['submit'] = array(
'#type' => 'button',
'#value' => t('Test'),
'#ajax' => array(
'callback' => 'access_filter_form_filter_callback_test',
'wrapper' => 'test-result',
),
);
$form['#attached']['js'] = array(
drupal_get_path('module', 'access_filter') . '/access_filter.js',
);
return $form;
}
/**
* Form validation handler for access_filter_edit_filter().
*
* @see access_filter_form_filter()
* @see access_filter_form_filter_submit()
*/
function access_filter_form_filter_validate($form, &$form_state) {
if ($form_state['triggering_element']['#value'] != t('Save')) {
return;
}
if (strlen($form_state['values']['name']) > 255) {
form_set_error('name', t('%field field value must be shorter than %length characters.', array(
'%field' => $form['basics']['name']['#title'],
'%length' => 255,
)));
}
$type = $form_state['values']['deny_action_settings']['type'];
$is_redirect = $type == ACCESS_FILTER_DENY_ACTION_301 || $type == ACCESS_FILTER_DENY_ACTION_302;
if ($is_redirect && !strlen($form_state['values']['deny_action_settings']['redirect_destination'])) {
form_set_error('deny_action_settings][redirect_destination', t('%field field is required.', array(
'%field' => $form['deny_action_settings']['redirect_destination']['#title'],
)));
}
}
/**
* Form submission handler for access_filter_form_filter().
*
* @see access_filter_form_filter()
* @see access_filter_form_filter_validate()
*/
function access_filter_form_filter_submit($form, &$form_state) {
if ($form_state['triggering_element']['#value'] == t('Back')) {
$form_state['redirect'] = 'admin/config/people/access_filter';
return;
}
elseif ($form_state['triggering_element']['#value'] != t('Save')) {
return;
}
$filter = access_filter_form_submit_build_filter($form_state);
switch (access_filter_save($filter)) {
case SAVED_NEW:
drupal_set_message(t('Created new access filter %filter.', array(
'%filter' => $filter->name,
)));
watchdog('access_filter', 'Created new access filter %filter.', array(
'%filter' => $filter->name,
), WATCHDOG_NOTICE, l(t('edit'), 'admin/config/people/access_filter/' . $filter->fid . '/edit'));
break;
case SAVED_UPDATED:
drupal_set_message(t('Updated access filter %filter.', array(
'%filter' => $filter->name,
)));
watchdog('access_filter', 'Updated access filter %filter.', array(
'%filter' => $filter->name,
), WATCHDOG_NOTICE, l(t('edit'), 'admin/config/people/access_filter/' . $filter->fid . '/edit'));
break;
}
$form_state['redirect'] = 'admin/config/people/access_filter';
}
/**
* Ajax callback function for access_filter_form_filter().
* Test filter and show result.
*/
function access_filter_form_filter_callback_test($form, $form_state) {
// Enables filter during test.
$filter = access_filter_form_submit_build_filter($form_state);
$filter->status = ACCESS_FILTER_STATUS_ENABLED;
$filter->testing = TRUE;
access_filter_parse_filter($filter);
$allowed = access_filter_check_access($filter, $form_state['values']['test_path'], $form_state['values']['test_ip']);
if ($allowed) {
$message = t('Access to %path from %ip will be allowed.', array(
'%path' => $form_state['values']['test_path'],
'%ip' => $form_state['values']['test_ip'],
));
$message_type = 'status';
}
else {
$message = t('Access to %path from %ip will be denied.', array(
'%path' => $form_state['values']['test_path'],
'%ip' => $form_state['values']['test_ip'],
));
$message_type = 'error';
}
return '<div id="test-result" class="messages ' . $message_type . '">' . $message . '</div>';
}
/**
* Updates the form state's filter by processing this submission's values.
*
* @param array $form_state
* An array of form state.
*
* @return object
* An object of filter.
*/
function access_filter_form_submit_build_filter(&$form_state) {
$filter = $form_state['filter'];
if (!$filter) {
$filter = new stdClass();
}
$filter->status = $form_state['values']['status'];
$filter->name = $form_state['values']['name'];
$filter->paths = access_filter_clean_list($form_state['values']['paths']);
$filter->rules = access_filter_clean_list($form_state['values']['rules']);
$filter->deny_action_settings = (object) $form_state['values']['deny_action_settings'];
return $filter;
}
/**
* Clean up list values to save.
*
* @param string $list
* A string of list values.
*
* @return string
* A string of cleaned list values.
*/
function access_filter_clean_list($list) {
$list = str_replace(array(
"\r\n",
"\r",
"\n",
), "\n", $list);
$list_array = array();
foreach (explode("\n", $list) as $item) {
$item = preg_replace('/^[\\s\\t ]+/u', '', $item);
$item = preg_replace('/[\\s\\t ]+$/u', '', $item);
if (strlen($item) > 0) {
$list_array[] = $item;
}
}
return implode("\n", $list_array);
}
/**
* Form builder to confirmation of delete filter.
*
* @ingroup forms
* @see access_filter_form_confirm_delete()
*/
function access_filter_form_confirm_delete($form, &$form_state, $filter = NULL) {
$form_state['filter'] = $filter;
$form['#submit'] = array(
'access_filter_form_confirm_delete_submit',
);
return confirm_form($form, t('Are you sure you want to delete the filter %title?', array(
'%title' => $filter->name,
)), 'admin/config/people/access_filter', t('This action cannot be undone.'), t('Delete'), t('Cancel'));
}
/**
* Form submission handler for access_filter_form_confirm_delete().
*
* @see access_filter_form_confirm_delete()
*/
function access_filter_form_confirm_delete_submit($form, &$form_state) {
$filter = $form_state['filter'];
db_delete('access_filter')
->condition('fid', $filter->fid)
->execute();
drupal_set_message(t('Deleted access filter %filter.', array(
'%filter' => $filter->name,
)));
watchdog('access_filter', 'Deleted access filter %filter.', array(
'%filter' => $filter->name,
), WATCHDOG_NOTICE, l(t('delete'), 'admin/config/people/access_filter/' . $filter->fid . '/delete'));
$form_state['redirect'] = 'admin/config/people/access_filter';
}Functions
Name |
Description |
|---|---|
| access_filter_build_fast | Serialize filters for fast mode. |
| access_filter_clean_list | Clean up list values to save. |
| access_filter_form_confirm_delete | Form builder to confirmation of delete filter. |
| access_filter_form_confirm_delete_submit | Form submission handler for access_filter_form_confirm_delete(). |
| access_filter_form_fast | Form builder for the filter fast settings form. |
| access_filter_form_filter | Form builder for the filter editing form. |
| access_filter_form_filter_callback_test | Ajax callback function for access_filter_form_filter(). Test filter and show result. |
| access_filter_form_filter_submit | Form submission handler for access_filter_form_filter(). |
| access_filter_form_filter_validate | Form validation handler for access_filter_edit_filter(). |
| access_filter_form_submit_build_filter | Updates the form state's filter by processing this submission's values. |
| access_filter_overview_filters | Form builder to list and manage filters. |
| access_filter_overview_filters_submit | Form submission handler for access_filter_overview_filters(). |
| theme_access_filter_overview_filters | Returns HTML for the access filter overview form as a list of filters. |