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   1  <?php
   2  // $Id: audio_playlist.module,v 1.8 2008/10/02 18:43:14 drewish Exp $
   3  
   4  /**
   5   * @file
   6   * This module provides a quick method of adding audio files to other nodes (that allow audio attachments).
   7   */
   8  
   9  
  10  /**
  11   * Implementation of hook_help().
  12   */
  13  function audio_playlist_help($section, $arg) {
  14    switch ($section) {
  15      case 'admin/help#audio_playlist':
  16        return t('This module provides a quick method of adding audio files to other nodes (that allow audio attachments).');
  17    }
  18  }
  19  
  20  
  21  /**
  22   * Implementation of hook_link().
  23   */
  24  function audio_playlist_link($type, $node = NULL, $teaser = FALSE) {
  25    global $base_url;
  26    global $user;
  27  
  28    $links = array();
  29    if ($node->type == 'audio') {
  30      if ((node_access('update', $node) || user_access('attach any existing audio file')) && (user_access('attach audio to own playlists') || user_access('attach audio to any playlist'))) {
  31        $links['audio_playlist_add_link'] = array(
  32           'title' => t('Add to playlist'),
  33           'href' => "audio_playlist/$node->nid",
  34           'query' => 'destination='. $_GET['q'],
  35           'attributes' => array('title' => t('Add to playlist')),
  36        );
  37      }
  38    }
  39  
  40    return $links;
  41  }
  42  
  43  /**
  44   *  Implementation of hook_perm
  45   */
  46  function audio_playlist_perm() {
  47    return array(
  48      'attach audio to own playlists',
  49      'attach audio to any playlist',
  50    );
  51  }
  52  
  53  /**
  54   * Implementation of hook_menu().
  55   */
  56  function audio_playlist_menu() {
  57    $items = array();
  58  
  59    $items['audio_playlist/%node'] = array(
  60      'title' => 'Add audio file to a playlist',
  61      'page callback' => 'drupal_get_form',
  62      'page arguments' => array('audio_playlist_add_form', 1),
  63      'access callback' => 'audio_playlist_access',
  64      'type' => MENU_CALLBACK,
  65    );
  66  
  67    return $items;
  68  }
  69  
  70  /**
  71   * Access callback to for the add playlist form.
  72   */
  73  function audio_playlist_access() {
  74    return user_access('attach audio to own playlists') || user_access('attach audio to any playlist');
  75  }
  76  
  77  function audio_playlist_add_form($node = NULL) {
  78    // make sure things are properly setup
  79    if (!audio_playlist_get_playlist_types()) {
  80      drupal_set_message("At least one content type must have <a href='!url'>audio attachments enabled</a> for playlists to work.", array('!url' => url('admin/content/types')));
  81      return;
  82    }
  83  
  84    // First try to pass the audio file through the URL, if that fails show a select box to choose an audio file.
  85    if (is_numeric(arg(1))) {
  86      $node = node_load(arg(1));
  87      if ($node->type == 'audio') {
  88        $form['audio_playlist']['aid'] = array(
  89          '#type' => 'value',
  90          '#value' => $node->nid,
  91        );
  92        $form['audio_playlist']['aid_name'] = array(
  93          '#type' => 'item',
  94          '#title' => t("Audio file"),
  95          '#value' => $node->title,
  96        );
  97      }
  98      else {
  99        drupal_set_message("Sorry, but only audio files can be added to a playlist.");
 100      }
 101    }
 102    else {
 103      // show a select box if audio isn't passed through URL
 104      $form['audio_playlist']['aid'] = array(
 105        '#type' => 'select',
 106        '#title' => t('Select audio file'),
 107        '#options' => audio_attach_get_audio_nodes(),
 108        '#description' => t('Choose an audio file to add to a playlist.')
 109      );
 110    }
 111  
 112    $form['audio_playlist']['playlists'] = array(
 113      '#type' => 'checkboxes',
 114      '#title' => t('Add to playlist(s)'),
 115      '#options' => audio_playlist_get_playlist_nodes(),
 116      '#description' => t('Select which playlists you want to add this file to.'),
 117    );
 118  
 119    $form['submit'] = array('#type' => 'submit', '#value' => t('Add to playlist'));
 120  
 121    return $form;
 122  }
 123  
 124  function audio_playlist_add_form_submit($form, &$form_state) {
 125    if ($form_state['values']['aid'] != 0) {
 126      foreach ($form_state['values']['playlists'] as $nid => $checked) {
 127        if ($checked) {
 128          audio_attach_add_child($nid, $form_state['values']['aid']);
 129        }
 130      }
 131      drupal_set_message("Added to playlist.");
 132    }
 133    else {
 134      drupal_set_message("Please select an audio file.", "error");
 135    }
 136  }
 137  
 138  /**
 139   * Fetch an array of all candidate referenced nodes, for use in presenting the selection form to the user.
 140   */
 141  function audio_playlist_get_playlist_nodes() {
 142    global $user;
 143  
 144    $playlist_types = audio_playlist_get_playlist_types();
 145    if (empty($playlist_types)) {
 146      return FALSE;
 147    }
 148    $types = array();
 149    foreach ($playlist_types as $type) {
 150      $types[]= "type = '$type' ";
 151    }
 152    $types = implode('OR ', $types);
 153    $sql = "SELECT n.nid, n.title FROM {node} n WHERE n.status=1 AND $types ";
 154    $sql .= !user_access("attach audio to any playlist") ? "AND n.uid = $user->uid " : "";
 155    $sql .= "ORDER BY n.sticky DESC, n.title ASC";
 156    $rows = array();
 157    $result = db_query(db_rewrite_sql($sql));
 158    while ($row = db_fetch_object($result)) {
 159      $node = node_load($row->nid);
 160      $rows[$node->nid] = $node->title ."<small> " . l("(i)", 'node/'. $node->nid, array("target" => "_blank")) ."</small>";
 161    }
 162    return $rows;
 163  }
 164  
 165  /**
 166   *  Return the content types which have audio_attach enabled.
 167   */
 168  function audio_playlist_get_playlist_types() {
 169    $node_types = node_get_types();
 170    $playlist_types = array();
 171    foreach ($node_types as $type => $name) {
 172      if (variable_get('audio_attach_'. $type, 0)) {
 173        $playlist_types[] = $type;
 174      }
 175    }
 176    return $playlist_types;
 177  }
 178