Restrict Voting to a specific forum

I guess there are now. I will need to look at the Forum module to see if there is any kind of setting that can be hooked into.

Realted to #709006: Create hook for access control and #1015808: Allow per-node vote disabling - there really need to be some extendable system for handling these situations. Wild thought: Is there some existing access system we could build upon to easily get a powerful pluggable system? Like Chaos tool's access plugins?

We probably need some kind of hooks/alters to extend this. However, I am very much opposed to requiring Ctools.

This will be included with my commit if I get permission [uses hook_plus1_access()]:

// $Id$

/**
 * @file
 * Limit which forums allow voting.
 */

/**
 * Implementation of hook_plus1_access().
 */
function plus1_forums_plus1_access($node, $op, $account) {
  if ($node->type == 'forum') {
    // Only show widget on selected forums.
    if (in_array($node->forum_tid, variable_get('plus1_forums', array()))) {
      return PLUS1_ACCESS_ALLOW;
    }
    else {
      return PLUS1_ACCESS_DENY;
    }
  }

  // Not a forum node, so ignore it.
  return PLUS1_ACCESS_IGNORE;
}

/**
 * Implements hook_form_alter().
 * Add individual node vote disabling.
 */
function plus1_forums_form_alter(&$form, $form_state, $form_id) {
// drupal_set_message($form_id);
  switch ($form_id) {
    case 'plus1_settings':
      $form['plus1_forums_fieldset'] = array(
        '#type' => 'fieldset',
        '#title' => t('Forum settings'),
        '#collapsible' => TRUE,
        '#collapsed' => FALSE,
        '#weight' => -3,
        );

      $fora = forum_get_forums();
      $forums_list = array();
      foreach ($fora as $forum) {
        $forums_list[$forum->tid] = $forum->name;
      }

      if ($forums_list) {
        $form['plus1_forums_fieldset']['plus1_forums'] = array(
          '#type' => 'checkboxes',
          '#options' => $forums_list,
          '#title' => t('Allow voting on these forums'),
          '#default_value' => variable_get('plus1_forums', array()),
          '#attributes' => array('class' => 'container-inline'),
          );
      }

      return;

    case 'forum_form_forum':
      $noyes = array(t('No'), t('Yes'));

      $state = FALSE;
      if (isset($form['tid'])) {
        $enabled = variable_get('plus1_forums', array());
        $state = in_array($form['tid']['#value'], $enabled);
      }

      $form['plus1_enable'] = array(
          '#type' => 'radios',
          '#options' => $noyes,
          '#title' => t('Allow voting on this forum'),
          '#default_value' => (int) $state,
          '#description' => t('Do you want to allow Plus 1 module voting for this forum?'),
          '#attributes' => array('class' => 'container-inline'),
          );

      $form['submit']['#weight'] = 99;
      $form['delete']['#weight'] = 99;

      // By letting the standard submit handler run first, we will get a tid
      // filled in for new forums.
      $form['#submit'][] = '_plus1_forums_form_submit';
      return;
  }
}

function _plus1_forums_form_submit($form, &$form_state) {
  if (isset($form_state['values']['tid'])) {
    $tid = $form_state['values']['tid'];
  }
  else {
    drupal_set_message(t('Incomplete data for forum "@name".', array('@name' => $form_state['values']['name'])), 'error');
    return;
  }

  // Get the current list of enabled forums.
  $forums = variable_get('plus1_forums', array());

  // Did they enable voting?
  if ($form_state['values']['plus1_enable']) {
    // Add this forum tid to the list, if it's new.
    if (!in_array($tid, $forums)) {
      $forums[] = $tid;
      variable_set('plus1_forums', $forums);
    }
  }
  else {
    // They disabled voting so remove the tid from the list.
    $key = array_search($tid, $forums);
    if ($key !== FALSE) {
      unset($forums[$key]);
      variable_set('plus1_forums', $forums);
    }
  }
}

Committed to 6.x-2.x-dev.