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<?php
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/**
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* @file
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* Plugin to provide access control based upon a parent term.
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*/
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/**
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* Plugins are described by creating a $plugin array which will be used
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* by the system that includes this file.
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*/
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$plugin = array(
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'title' => t("Taxonomy: term depth"),
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'description' => t('Control access by the depth of a term.'),
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'callback' => 'term_depth_term_depth_ctools_access_check',
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'default' => array('vid' => array(), 'depth' => 0),
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'settings form' => 'term_depth_term_depth_ctools_access_settings',
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'settings form validation' => 'term_depth_term_depth_ctools_access_settings_validate',
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'settings form submit' => 'term_depth_term_depth_ctools_access_settings_submit',
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'summary' => 'term_depth_term_depth_ctools_access_summary',
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'required context' => new ctools_context_required(t('Term'), array('taxonomy_term', 'terms')),
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);
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/**
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* Settings form for the 'term depth' access plugin.
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*/
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function term_depth_term_depth_ctools_access_settings($form, &$form_state, $conf) {
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// If no configuration was saved before, set some defaults.
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if (empty($conf)) {
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$conf = array(
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'vid' => 0,
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);
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}
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if (!isset($conf['vid'])) {
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$conf['vid'] = 0;
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}
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// Loop over each of the configured vocabularies.
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foreach (taxonomy_get_vocabularies() as $vid => $vocabulary) {
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$options[$vid] = $vocabulary->name;
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}
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$form['settings']['vid'] = array(
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'#title' => t('Vocabulary'),
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'#type' => 'select',
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'#options' => $options,
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'#description' => t('Select the vocabulary for this form. If there exists a parent term in that vocabulary, this access check will succeed.'),
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'#id' => 'ctools-select-vid',
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'#default_value' => $conf['vid'],
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'#required' => TRUE,
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);
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$form['settings']['depth'] = array(
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'#title' => t('Depth'),
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'#type' => 'textfield',
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'#description' => t('Set the required depth of the term. If the term exists at the correct depth, this access check will succeed.'),
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'#default_value' => $conf['depth'],
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'#required' => TRUE,
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);
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return $form;
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}
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/**
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* Submit function for the access plugins settings.
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*
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* We cast all settings to numbers to ensure they can be safely handled.
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*/
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function term_depth_term_depth_ctools_access_settings_submit($form, $form_state) {
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foreach (array('depth', 'vid') as $key) {
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$form_state['conf'][$key] = (integer) $form_state['values']['settings'][$key];
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}
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}
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/**
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* Check for access.
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*/
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function term_depth_term_depth_ctools_access_check($conf, $context) {
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// As far as I know there should always be a context at this point, but this
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// is safe.
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if (empty($context) || empty($context->data) || empty($context->data->vid) || empty($context->data->tid)) {
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return FALSE;
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}
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// Get the $vid.
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if (!isset($conf['vid'])) {
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return FALSE;
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}
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$depth = _term_depth($context->data->tid);
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return ($depth == $conf['depth']);
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}
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/**
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* Provide a summary description based upon the checked terms.
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*/
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function term_depth_term_depth_ctools_access_summary($conf, $context) {
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$vocab = taxonomy_vocabulary_load($conf['vid']);
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return t('"@term" has parent in vocabulary "@vocab" at @depth', array(
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'@term' => $context->identifier,
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'@vocab' => $vocab->name,
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'@depth' => $conf['depth'],
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));
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}
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/**
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* Find the depth of a term.
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*/
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function _term_depth($tid) {
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static $depths = array();
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if (!isset($depths[$tid])) {
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$parent = db_select('taxonomy_term_hierarchy', 'th')
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->fields('th', array('parent'))
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->condition('tid', $tid)
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->execute()->fetchField();
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if ($parent == 0) {
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$depths[$tid] = 1;
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}
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else {
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$depths[$tid] = 1 + _term_depth($parent);
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}
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}
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return $depths[$tid];
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}
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