materio-base-d7/sites/all/modules/contrib/taxonomy/tac_lite/tac_lite_create.module

<?php
/**
 * @file
 * Use tac_lite to control which terms can be used when creating new
 * content.  Unlike tac_lite.module, which relies on Drupal's node_access
 * features, this module uses hook_form_alter to change which terms are
 * presented by the taxonomy module.
 *
 * Original implementation by markDrupal http://drupal.org/user/93970.
 */

/**
 * Implementation of hook_form_alter().
 */
function tac_lite_create_form_alter(&$form, $form_state, $form_id) {
  if (strpos($form_id, 'node_form') !== FALSE) {
    global $user;

    if (user_access('administer tac_lite')) {
      // no need to restrict based on update permission in this cases
      return;
    }

    // the vocabularies containing protected info.
    $vids = variable_get('tac_lite_categories', array(0));

    // the terms this user is allowed to edit
    $tids = array();
    for ($i = 1; $i <= variable_get('tac_lite_schemes', 1); $i++) {
      $config = _tac_lite_config($i);
      if ((isset($config['tac_lite_create']) && $config['tac_lite_create']) ||
        in_array('grant_update', $config['perms'])) {
        $tids = array_merge($tids, _tac_lite_user_tids($user, $i));
      }
    }

    // Go through all of the fields in the system to find the ones we want use
    $term_fields = array();
    $info = field_info_fields();
    foreach($info as $key => $value){
      // First check for taxonomy_term_reference fields.
      if ($value['type'] == 'taxonomy_term_reference') {
        // Then check to see if they are associated with this node type (entity bundle).
        if (isset($value['bundles']['node'])) {
          if (in_array($form['#bundle'], $value['bundles']['node'])) {
            // Add an entry to our term_fields in the form of field name => vocabulary machine name
            $term_fields[$key] = $value['settings']['allowed_values'][0]['vocabulary'];
          }
        }
      }
    }

    // Now that we have the names of the fields, go through each one in the form.
    foreach($term_fields as $field_name => $vocab_name) {
      // Get the language key so we can find the correct element in the field.
      $field_language = $form[$field_name]['#language'];

      // Avoid PHP errors
      if (empty($form[$field_name]) || empty($form[$field_name][$field_language])) {
        continue;
      }

      // Skip auto complete fields as they are not supported.
      if ($form[$field_name][$field_language]['#type'] != 'select' && $form[$field_name][$field_language]['#type'] != 'radios'){
        continue;
      }

      // Get the vocabulary info so we can get the vid.
      $v = taxonomy_vocabulary_machine_name_load($vocab_name);

      // We only want to act on this field if it is tied to a vocabulary we are set to control.
      if(!in_array($v->vid, $vids)) {
        continue;
      }

      // Go through each option for this field.
      foreach ($form[$field_name][$field_language]['#options'] as $term_id => $term_name) {
        // Skip the "<none>" option (or anything like it).
        if (!is_numeric($term_id)) {
          continue;
        }

        // Is this option not in the list of terms this user can create with?
        if (!in_array($term_id, $tids)) {
          // The term is not the default value, and user is not allowed to create with it.
          // HELP: What if it IS the default value? Do we not unset it?
          if ($term_id != $form[$field_name][$field_language]['#default_value']) {
            // Unset the option to it doesn't appear.
            // TODO: It would be a nice feature to have tids that are already selected.
            // go into a value element so we could merge then when saving the node.
            unset($form[$field_name][$field_language]['#options'][$term_id]);
          }
        }
      }

      // If there are no options left, but this field is required then throw a 404.
      if (count($form[$field_name][$field_language]['#options']) == 0 && !empty($form[$field_name]['#required'])) {
        drupal_set_message(t('You have no permissions to add content to the required %name vocabulary. Please contact the site administrator if you believe you should have permission to add content.', array('%name' => $form[$field_name]['#title'])));
        drupal_access_denied();
        exit();
      }

      // Don't show if the only option left is <none>.
      if (empty($form[$field_name][$field_language]['#options']) ||
          (count($form[$field_name][$field_language]['#options']) == 1 && isset($form[$field_name][$field_language]['#options']['_none']))) {
        $form[$field_name]['#access'] = FALSE;
      }
      // HELP: Is size deprecated?
      /*
      if (isset($form[$field_name]['#size']) && $form[$field_name]['#size'] > count($form['taxonomy'][$field_language]['#options'])) {
        $form[$field_name]['#size'] = count($form[$field_name][$field_language]['#options']);
      }
      */
    }
  }
  elseif ($form_id == 'tac_lite_admin_scheme_form') {
    $config = $form['#tac_lite_config'];
    $scheme = $form_state['build_info']['args'][0];
    if (!empty($form['tac_lite_config_scheme_' . $scheme])) {
      $form['tac_lite_config_scheme_' . $scheme]['tac_lite_create'] = array(
        '#type' => 'checkbox',
        '#title' => 'Visibility on create and edit forms',
        '#default_value' => isset($config['tac_lite_create']) ? $config['tac_lite_create'] : FALSE,
        '#description' => t('Show terms when creating content.  This <strong>does not</strong> control which users can create a given content type. This <strong>does</strong> control which terms appear on the node edit forms.  <br/>Note that schemes granting <em>update</em> permission (above) imply <em>visibility on forms</em> as well.'),
      );
    }
  }
}