print_pdf/print_pdf.module

   1 <?php
   2
   3 /**
   4  * @file
   5  * Displays Printer-friendly versions of Drupal pages.
   6  *
   7  * @ingroup print
   8  */
   9
  10 define('PRINTPDF_PATH', 'printpdf');
  11
  12 // Defined in print.module
  13 //define('PRINT_PDF_FORMAT', 'pdf');
  14
  15 define('PRINT_PDF_LIB_PATH', 'sites/all/libraries');
  16
  17 define('PRINT_PDF_LINK_POS_DEFAULT', 'link');
  18 define('PRINT_PDF_LINK_TEASER_DEFAULT', 0);
  19 define('PRINT_PDF_SHOW_LINK_DEFAULT', 1);
  20 define('PRINT_PDF_NODE_LINK_VISIBILITY_DEFAULT', 0);
  21 define('PRINT_PDF_NODE_LINK_PAGES_DEFAULT', '');
  22 define('PRINT_PDF_LINK_CLASS_DEFAULT', 'print-pdf');
  23 define('PRINT_PDF_SYS_LINK_VISIBILITY_DEFAULT', 1);
  24 define('PRINT_PDF_SYS_LINK_PAGES_DEFAULT', '');
  25 define('PRINT_PDF_LINK_USE_ALIAS_DEFAULT', 0);
  26 define('PRINT_PDF_BOOK_LINK_DEFAULT', 1);
  27 define('PRINT_PDF_PDF_TOOL_DEFAULT', 0);
  28 define('PRINT_PDF_CONTENT_DISPOSITION_DEFAULT', 2);
  29 define('PRINT_PDF_PAPER_SIZE_DEFAULT', 'A4');
  30 define('PRINT_PDF_PAGE_ORIENTATION_DEFAULT', 'portrait');
  31 define('PRINT_PDF_AUTOCONFIG_DEFAULT', 1);
  32 define('PRINT_PDF_FONT_FAMILY_DEFAULT', 'dejavusans');
  33 define('PRINT_PDF_FONT_SIZE_DEFAULT', 10);
  34 define('PRINT_PDF_FONT_SUBSETTING_DEFAULT', 0);
  35 define('PRINT_PDF_FILENAME_DEFAULT', '[site:name] - [node:title] - [node:changed:custom:Y-m-d]');
  36 define('PRINT_PDF_DOMPDF_UNICODE_DEFAULT', 0);
  37 define('PRINT_PDF_WKHTMLTOPDF_OPTIONS', "--footer-font-size 7 --footer-right '[page]'");
  38
  39 /**
  40  * Implements hook_permission().
  41  */
  42 function print_pdf_permission() {
  43   return array(
  44     'access PDF version' => array(
  45       'title' => t('Access the PDF version'),
  46       'description' => t('View the PDF versions and the links to them in the original pages.'),
  47     ),
  48   );
  49 }
  50
  51 /**
  52  * Implements hook_theme().
  53  */
  54 function print_pdf_theme() {
  55   return array(
  56     'print_pdf_format_link' => array(
  57       'variables' => array(),
  58     ),
  59     'print_pdf_dompdf_footer' => array(
  60       'variables' => array('html' => ''),
  61       'file' => 'print_pdf.pages.inc',
  62     ),
  63     'print_pdf_tcpdf_header' => array(
  64       'variables' => array('pdf' => NULL, 'html' => '', 'font' => array()),
  65       'file' => 'print_pdf.pages.inc',
  66     ),
  67     'print_pdf_tcpdf_page' => array(
  68       'variables' => array('pdf' => NULL),
  69       'file' => 'print_pdf.pages.inc',
  70     ),
  71     'print_pdf_tcpdf_content' => array(
  72       'variables' => array('pdf' => NULL, 'html' => '', 'font' => array()),
  73       'file' => 'print_pdf.pages.inc',
  74     ),
  75     'print_pdf_tcpdf_footer' => array(
  76       'variables' => array('pdf' => NULL, 'html' => '', 'font' => array()),
  77       'file' => 'print_pdf.pages.inc',
  78     ),
  79     'print_pdf_tcpdf_footer2' => array(
  80       'variables' => array('pdf' => NULL),
  81       'file' => 'print_pdf.pages.inc',
  82     ),
  83   );
  84 }
  85
  86 /**
  87  * Implements hook_menu().
  88  */
  89 function print_pdf_menu() {
  90   $items = array();
  91
  92   $items[PRINTPDF_PATH] = array(
  93     'title' => 'Printer-friendly PDF',
  94     'page callback' => 'print_pdf_controller',
  95     'access arguments' => array('access PDF version'),
  96     'type' => MENU_CALLBACK,
  97     'file' => 'print_pdf.pages.inc',
  98   );
  99   $items[PRINTPDF_PATH . '/' . PRINTPDF_PATH] = array(
 100     'access callback' => FALSE,
 101   );
 102   $items['admin/config/print/pdf'] = array(
 103     'title' => 'PDF',
 104     'page callback' => 'drupal_get_form',
 105     'page arguments' => array('print_pdf_settings'),
 106     'access arguments'  => array('administer print'),
 107     'weight' => 3,
 108     'type' => MENU_LOCAL_TASK,
 109     'file' => 'print_pdf.admin.inc',
 110   );
 111   $items['admin/config/print/pdf/options'] = array(
 112     'title' => 'Options',
 113     'weight' => 1,
 114     'type' => MENU_DEFAULT_LOCAL_TASK,
 115   );
 116   $items['admin/config/print/pdf/strings'] = array(
 117     'title' => 'Text strings',
 118     'page callback' => 'drupal_get_form',
 119     'page arguments' => array('print_pdf_strings_settings'),
 120     'access arguments'  => array('administer print'),
 121     'weight' => 2,
 122     'type' => MENU_LOCAL_TASK,
 123     'file' => 'print_pdf.admin.inc',
 124   );
 125
 126   return $items;
 127 }
 128
 129 /**
 130  * Implements hook_block_info().
 131  */
 132 function print_pdf_block_info() {
 133       $block['print_pdf-top']['info'] = t('Most PDFd');
 134       $block['print_pdf-top']['cache'] = DRUPAL_CACHE_GLOBAL;
 135       return $block;
 136 }
 137
 138 /**
 139  * Implements hook_block_view().
 140  */
 141 function print_pdf_block_view($delta = 0) {
 142       switch ($delta) {
 143       case 'print_pdf-top':
 144         $block['subject'] = t('Most PDFd');
 145         $result = db_query_range("SELECT path FROM {print_pdf_page_counter} ORDER BY totalcount DESC", 0, 3)
 146                     ->fetchAll();
 147         if (count($result)) {
 148           $block['content'] = '<div class="item-list"><ul>';
 149           foreach ($result as $obj) {
 150             $block['content'] .= '<li>' . l(_print_get_title($obj->path), $obj->path) . '</li>';
 151           }
 152           $block['content'] .= '</ul></div>';
 153         }
 154         break;
 155       }
 156       return $block;
 157 }
 158
 159 /**
 160  * Implements hook_requirements().
 161  */
 162 function print_pdf_requirements($phase) {
 163   $requirements = array();
 164   $t = get_t();
 165   switch ($phase) {
 166     // At runtime, make sure that a PDF generation tool is selected
 167     case 'runtime':
 168       $print_pdf_pdf_tool = variable_get('print_pdf_pdf_tool', PRINT_PDF_PDF_TOOL_DEFAULT);
 169       if (empty($print_pdf_pdf_tool)) {
 170         $requirements['print_pdf_tool'] = array(
 171           'title' => $t('PDF generation library'),
 172           'value' => $t('No PDF tool selected'),
 173           'description' => $t('Please configure it in the <a href="@url">PDF settings page</a>.', array('@url' => url('admin/config/print/pdf'))),
 174           'severity' => REQUIREMENT_ERROR,
 175         );
 176       }
 177       else {
 178         if (!is_file($print_pdf_pdf_tool) || !is_readable($print_pdf_pdf_tool)) {
 179           $requirements['print_pdf_tool'] = array(
 180             'title' => $t('PDF generation tool'),
 181             'value' => $t('File not found'),
 182             'description' => $t('The currently selected PDF generation library (%file) is no longer accessible.', array('%file' => $print_pdf_pdf_tool)),
 183             'severity' => REQUIREMENT_ERROR,
 184           );
 185         }
 186         elseif (basename($print_pdf_pdf_tool) == 'dompdf_config.inc.php') {
 187           $directory = dirname($print_pdf_pdf_tool) . '/lib/fonts';
 188           if (!is_dir($directory) || !is_writable($directory)) {
 189             $requirements['print_pdf_tool'] = array(
 190               'title' => $t('DOMPDF font cache directory'),
 191               'value' => $t('Non-writable permissions'),
 192               'description' => $t('You must change the %fontdir permissions to be writable, as dompdf requires write-access to that directory.', array('%fontdir' => $directory)),
 193               'severity' => REQUIREMENT_ERROR,
 194             );
 195           }
 196         }
 197         elseif (substr(basename($print_pdf_pdf_tool, '.exe'), 0, 11) == 'wkhtmltopdf') {
 198           if (function_exists('is_executable') && !is_executable($print_pdf_pdf_tool)) {
 199             $requirements['print_pdf_tool'] = array(
 200               'title' => $t('wkhtmltopdf library'),
 201               'value' => $t('Non-executable permissions'),
 202               'description' => $t('You must modify the permissions of the wkhtmltopdf file (%file) to make it executable.', array('%file' => $print_pdf_pdf_tool)),
 203               'severity' => REQUIREMENT_ERROR,
 204             );
 205           }
 206           else {
 207             $version = _print_pdf_wkhtmltopdf_version();
 208             if (version_compare($version, '0.9.6', '<')) {
 209               $requirements['print_pdf_tool'] = array(
 210                 'title' => $t('wkhtmltopdf library'),
 211                 'value' => $t('Unsupported version'),
 212                 'description' => $t('The currently selected version of wkhtmltopdf (@version) is not supported. Please update to a <a href="@url">newer version</a>.', array('@version' => $version, '@url' => url('http://code.google.com/p/wkhtmltopdf/'))),
 213                 'severity' => REQUIREMENT_ERROR,
 214               );
 215             }
 216           }
 217         }
 218       }
 219       break;
 220   }
 221   return $requirements;
 222 }
 223
 224 /**
 225  * Implements hook_node_view().
 226  */
 227 function print_pdf_node_view($node, $build_mode) {
 228   $print_pdf_link_pos = variable_get('print_pdf_link_pos', array(PRINT_PDF_LINK_POS_DEFAULT => PRINT_PDF_LINK_POS_DEFAULT));
 229   $print_pdf_link_use_alias = variable_get('print_pdf_link_use_alias', PRINT_PDF_LINK_USE_ALIAS_DEFAULT);
 230   $allowed_type = print_pdf_link_allowed(array('type' => 'node', 'node' => $node, 'teaser' => ($build_mode == 'teaser')));
 231   if (($allowed_type) && !empty($print_pdf_link_pos['link'])) {
 232     drupal_add_css(drupal_get_path('module', 'print') . '/css/printlinks.css');
 233     $links = array();
 234     $format = theme('print_pdf_format_link');
 235
 236     // Show book link
 237     if ($allowed_type === PRINT_ALLOW_BOOK_LINK) {
 238       $links['book_pdf'] = array('href' => PRINTPDF_PATH . '/book/export/html/' . $node->nid,
 239                                  'title' => $format['text'],
 240                                  'attributes' => $format['attributes'],
 241                                  'html' => $format['html'],
 242       );
 243     }
 244     elseif ($allowed_type === PRINT_ALLOW_NORMAL_LINK) {
 245       $query_arr = $_GET;
 246       if ('node' == 'comment') {
 247         $query_arr['comment'] = $node->cid;
 248       }
 249       $query = print_query_string_encode($query_arr, array('q'));
 250       if (empty($query)) $query = NULL;
 251
 252       if ($print_pdf_link_use_alias) {
 253         $path = drupal_get_path_alias('node/' . $node->nid);
 254       }
 255       else {
 256         $path = $node->nid;
 257       }
 258
 259       $links['print_pdf'] = array('href' => PRINTPDF_PATH . '/' . $path,
 260                                   'title' => $format['text'],
 261                                   'attributes' => $format['attributes'],
 262                                   'html' => $format['html'],
 263                                   'query' => $query,
 264       );
 265     }
 266     $node->content['links']['print_pdf'] = array(
 267       '#theme' => 'links',
 268       '#links' => $links,
 269       '#attributes' => array('class' => array('links', 'inline')),
 270     );
 271   }
 272
 273   // Insert content corner links
 274   if ((!empty($print_pdf_link_pos['corner'])) && ($build_mode == 'full')) {
 275     $node->content['print_links']['#markup'] .= print_pdf_insert_link(NULL, $node);
 276   }
 277 }
 278
 279 /**
 280  * Implements hook_help().
 281  */
 282 function print_pdf_help($path, $arg) {
 283   $print_pdf_link_pos = variable_get('print_pdf_link_pos', array(PRINT_PDF_LINK_POS_DEFAULT => PRINT_PDF_LINK_POS_DEFAULT));
 284   if (($path !== 'node/%') && !(empty($print_pdf_link_pos['link']) && empty($print_pdf_link_pos['corner']))) {
 285     static $output = FALSE;
 286
 287     if ($output === FALSE) {
 288       $output = TRUE;
 289
 290       $link = print_pdf_insert_link();
 291       if ($link) {
 292         return "<span class='print-syslink'>$link</span>";
 293       }
 294     }
 295   }
 296 }
 297
 298 /**
 299  * Implements hook_node_load().
 300  */
 301 function print_pdf_node_load($nodes, $types) {
 302   foreach ($nodes as $node) {
 303     _print_pdf_set_node_fields($node);
 304   }
 305 }
 306
 307 /**
 308  * Implements hook_node_insert().
 309  */
 310 function print_pdf_node_insert($node) {
 311   if (user_access('administer print') || user_access('node-specific print configuration')) {
 312     if ($node->print_pdf_display === NULL) $node->print_pdf_display = variable_get('print_pdf_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
 313     if ($node->print_pdf_display_comment === NULL) $node->print_pdf_display_comment = variable_get('print_pdf_display_comment_' . $node->type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 314     if ($node->print_pdf_display_urllist === NULL) $node->print_pdf_display_urllist = variable_get('print_pdf_display_urllist_' . $node->type, PRINT_TYPE_URLLIST_DEFAULT);
 315
 316     _print_pdf_node_conf_modify($node->nid, $node->print_pdf_display, $node->print_pdf_display_comment, $node->print_pdf_display_urllist);
 317   }
 318 }
 319
 320 /**
 321  * Implements hook_node_update().
 322  */
 323 function print_pdf_node_update($node) {
 324   if (user_access('administer print') || user_access('node-specific print configuration')) {
 325     if ($node->print_pdf_display === NULL) $node->print_pdf_display = variable_get('print_pdf_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
 326     if ($node->print_pdf_display_comment === NULL) $node->print_pdf_display_comment = variable_get('print_pdf_display_comment_' . $node->type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 327     if ($node->print_pdf_display_urllist === NULL) $node->print_pdf_display_urllist = variable_get('print_pdf_display_urllist_' . $node->type, PRINT_TYPE_URLLIST_DEFAULT);
 328
 329     _print_pdf_node_conf_modify($node->nid, $node->print_pdf_display, $node->print_pdf_display_comment, $node->print_pdf_display_urllist);
 330   }
 331 }
 332
 333 /**
 334  * Implements hook_node_delete().
 335  */
 336 function print_pdf_node_delete($node) {
 337   db_delete('print_pdf_node_conf')
 338     ->condition('nid', $node->nid)
 339     ->execute();
 340   db_delete('print_pdf_page_counter')
 341     ->condition('path', 'node/' . $node->nid)
 342     ->execute();
 343 }
 344
 345 /**
 346  * Implements hook_form_alter().
 347  */
 348 function print_pdf_form_alter(&$form, &$form_state, $form_id) {
 349   // Add the node-type settings option to activate the PDF version link
 350   if ((user_access('administer print') || user_access('node-specific print configuration')) &&
 351       (($form_id == 'node_type_form') || !empty($form['#node_edit_form']))) {
 352     $form['print']['pdf_label'] = array(
 353       '#type' => 'markup',
 354       '#markup' => '<p><strong>' . t('PDF version') . '</strong></p>',
 355     );
 356
 357     $form['print']['print_pdf_display'] = array(
 358       '#type' => 'checkbox',
 359       '#title' => t('Show link'),
 360     );
 361     $form['print']['print_pdf_display_comment'] = array(
 362       '#type' => 'checkbox',
 363       '#title' => t('Show link in individual comments'),
 364     );
 365     $form['print']['print_pdf_display_urllist'] = array(
 366       '#type' => 'checkbox',
 367       '#title' => t('Show Printer-friendly URLs list'),
 368     );
 369
 370     if ($form_id == 'node_type_form') {
 371       $form['print']['print_pdf_display']['#default_value'] = variable_get('print_pdf_display_' . $form['#node_type']->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
 372       $form['print']['print_pdf_display_comment']['#default_value'] = variable_get('print_pdf_display_comment_' . $form['#node_type']->type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 373       $form['print']['print_pdf_display_urllist']['#default_value'] = variable_get('print_pdf_display_urllist_' . $form['#node_type']->type, PRINT_TYPE_URLLIST_DEFAULT);
 374     }
 375     else {
 376       $node = $form['#node'];
 377       $form['print']['print_pdf_display']['#default_value'] = isset($node->print_pdf_display) ? $node->print_pdf_display : variable_get('print_pdf_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
 378       $form['print']['print_pdf_display_comment']['#default_value'] = isset($node->print_pdf_display_comment) ? $node->print_pdf_display_comment : variable_get('print_pdf_display_comment_' . $node->type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 379       $form['print']['print_pdf_display_urllist']['#default_value'] = isset($node->print_pdf_display_urllist) ? $node->print_pdf_display_urllist : variable_get('print_pdf_display_urllist_' . $node->type, PRINT_TYPE_URLLIST_DEFAULT);
 380     }
 381   }
 382 }
 383
 384 /**
 385  * Auxiliary function to assign the per-node settings to the node object fields
 386  *
 387  * @param $node
 388  *   node to be modified
 389  */
 390 function _print_pdf_set_node_fields(&$node) {
 391   if (isset($node->nid)) {
 392     $res = db_query("SELECT link, comments, url_list FROM {print_pdf_node_conf} WHERE nid = :nid", array(':nid' => $node->nid))
 393               ->fetch();
 394   }
 395   else {
 396     $res = FALSE;
 397   }
 398   $node->print_pdf_display = $res ? intval($res->link) : variable_get('print_pdf_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
 399   $node->print_pdf_display_comment = $res ? intval($res->comments) : variable_get('print_pdf_display_comment_' . $node->type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 400   $node->print_pdf_display_urllist = $res ? intval($res->url_list) : variable_get('print_pdf_display_urllist_' . $node->type, PRINT_TYPE_URLLIST_DEFAULT);
 401 }
 402
 403 /**
 404  * Update the print_pdf_node_conf table to reflect the given attributes
 405  * If updating to the default values, delete the record.
 406  *
 407  * @param $nid
 408  *   value of the nid field (primary key)
 409  * @param $link
 410  *   value of the link field (0 or 1)
 411  * @param $comments
 412  *   value of the comments field (0 or 1)
 413  * @param $url_list
 414  *   value of the url_list field (0 or 1)
 415  */
 416 function _print_pdf_node_conf_modify($nid, $link, $comments, $url_list) {
 417     db_merge('print_pdf_node_conf')
 418       ->key(array('nid' => $nid))
 419       ->fields(array(
 420         'link' => $link,
 421         'comments' => $comments,
 422         'url_list' => $url_list,
 423       ))
 424       ->execute();
 425 }
 426
 427 /**
 428  * Format the PDF version link
 429  *
 430  * @return
 431  *   array of formatted attributes
 432  * @ingroup themeable
 433  */
 434 function theme_print_pdf_format_link() {
 435   $print_pdf_link_class  = variable_get('print_pdf_link_class', PRINT_PDF_LINK_CLASS_DEFAULT);
 436   $print_pdf_content_disposition = variable_get('print_pdf_content_disposition', PRINT_PDF_CONTENT_DISPOSITION_DEFAULT);
 437   $print_pdf_show_link = variable_get('print_pdf_show_link', PRINT_PDF_SHOW_LINK_DEFAULT);
 438   $print_pdf_link_text = filter_xss(variable_get('print_pdf_link_text', t('PDF version')));
 439
 440   $img = drupal_get_path('module', 'print') . '/icons/pdf_icon.gif';
 441   $title = t('Display a PDF version of this page.');
 442   $class = strip_tags($print_pdf_link_class);
 443   $new_window = ($print_pdf_content_disposition == 1);
 444   $format = _print_format_link_aux($print_pdf_show_link, $print_pdf_link_text, $img);
 445
 446   return array('text' => $format['text'],
 447                'html' => $format['html'],
 448                'attributes' => print_fill_attributes($title, $class, $new_window),
 449               );
 450 }
 451
 452 /**
 453  * Auxiliary function to display a formatted PDF version link
 454  *
 455  * Function made available so that developers may call this function from
 456  * their defined pages/blocks.
 457  *
 458  * @param $path
 459  *   path of the original page (optional). If not specified, the current URL
 460  *   is used
 461  * @param $node
 462  *   an optional node object, to be used in defining the path, if used, the
 463  *   path argument is irrelevant
 464  * @return
 465  *   string with the HTML link to the printer-friendly page
 466  */
 467 function print_pdf_insert_link($path = NULL, $node = NULL) {
 468   if ($node !== NULL) {
 469     $nid = $node->nid;
 470     $path = 'node/' . $nid;
 471     $allowed_type = print_pdf_link_allowed(array('node' => $node));
 472   }
 473   else {
 474     if ($path === NULL) {
 475       $nid = preg_replace('!^node/!', '', $_GET['q']);
 476       $path = $_GET['q'];
 477     }
 478     else {
 479       $nid = NULL;
 480     }
 481     $allowed_type = print_pdf_link_allowed(array('path' => $path));
 482   }
 483
 484   if ($allowed_type) {
 485     if ($nid !== NULL) {
 486       if ($allowed_type === PRINT_ALLOW_BOOK_LINK) {
 487         $path = 'book/export/html/' . $nid;
 488       }
 489       else {
 490         if (variable_get('print_pdf_link_use_alias', PRINT_PDF_LINK_USE_ALIAS_DEFAULT)) {
 491           $path = drupal_get_path_alias($path);
 492         }
 493         else {
 494           $path = $nid;
 495         }
 496       }
 497       $path = PRINTPDF_PATH . '/' . $path;
 498       $query = print_query_string_encode($_GET, array('q'));
 499       if (empty($query)) {
 500         $query = NULL;
 501       }
 502     }
 503     else {
 504       $query = NULL;
 505     }
 506     drupal_add_css(drupal_get_path('module', 'print') . '/css/printlinks.css');
 507     $format = theme('print_pdf_format_link');
 508     return '<span class="print_pdf">' . l($format['text'], $path, array('attributes' => $format['attributes'], 'query' => $query, 'absolute' => TRUE, 'html' => $format['html'])) . '</span>';
 509   }
 510   else {
 511     return FALSE;
 512   }
 513 }
 514
 515 /**
 516  * Determine a the link to the PDF version is allowed depending on all possible settings
 517  *
 518  * @param $args
 519  *   array containing the possible parameters:
 520  *    teaser, node, type, path
 521  * @return
 522  *   FALSE if not allowed
 523  *   PRINT_ALLOW_NORMAL_LINK if a normal link is allowed
 524  *   PRINT_ALLOW_BOOK_LINK if a link is allowed in a book node
 525  */
 526 function print_pdf_link_allowed($args) {
 527   $print_pdf_pdf_tool = variable_get('print_pdf_pdf_tool', PRINT_PDF_PDF_TOOL_DEFAULT);
 528   if ((!empty($args['teaser']) && !variable_get('print_pdf_link_teaser', PRINT_PDF_LINK_TEASER_DEFAULT))
 529       || !user_access('access PDF version') || (empty($print_pdf_pdf_tool))) {
 530     // If the teaser link is disabled or the user is not allowed
 531     return FALSE;
 532   }
 533   if (!empty($args['path'])) {
 534     $nid = preg_replace('!^node/!', '', drupal_get_normal_path($args['path']));
 535     if (is_numeric($nid)) {
 536       $args['node'] = node_load($nid);
 537     }
 538   }
 539   if (!empty($args['node'])) {
 540     static $node_type = FALSE;
 541
 542     $node = $args['node'];
 543     if (isset($node->type)) {
 544       $node_type = $node->type;
 545     }
 546     // Node
 547     $print_pdf_node_link_visibility = variable_get('print_pdf_node_link_visibility', PRINT_PDF_NODE_LINK_VISIBILITY_DEFAULT);
 548     $print_pdf_node_link_pages = variable_get('print_pdf_node_link_pages', PRINT_PDF_NODE_LINK_PAGES_DEFAULT);
 549
 550     if (!_print_page_match($print_pdf_node_link_visibility, "node/" . $node->nid, $print_pdf_node_link_pages)) {
 551       // Page not in visibility list
 552       return FALSE;
 553     }
 554     elseif (isset($args['type']) && ($args['type'] == 'comment') && isset($node_type)) {
 555       // Link is for a comment, return the configured setting
 556       $res = db_query("SELECT comments FROM {print_pdf_node_conf} WHERE nid = :nid", array(':nid' => $node->nid))
 557                 ->fetch();
 558       $print_display_comment = $res ? intval($res->comments) : variable_get('print_pdf_display_comment_' . $node_type, PRINT_TYPE_COMMENT_LINK_DEFAULT);
 559       if ($print_display_comment) {
 560         return PRINT_ALLOW_NORMAL_LINK;
 561       }
 562     }
 563     else {
 564       // Node link
 565       if (!$node->print_pdf_display) {
 566         // Link for this node is disabled
 567         return FALSE;
 568       }
 569       elseif (isset($node->book)) {
 570         // Node is a book;
 571         $print_pdf_book_link = variable_get('print_pdf_book_link', PRINT_PDF_BOOK_LINK_DEFAULT);
 572         switch ($print_pdf_book_link) {
 573           case 1:
 574             if (user_access('access printer-friendly version')) {
 575               return PRINT_ALLOW_BOOK_LINK;
 576             }
 577             break;
 578           case 2:
 579             return PRINT_ALLOW_NORMAL_LINK;
 580         }
 581       }
 582       else {
 583         return PRINT_ALLOW_NORMAL_LINK;
 584       }
 585     }
 586   }
 587   else {
 588     // 'System' page
 589     $print_pdf_sys_link_visibility = variable_get('print_pdf_sys_link_visibility', PRINT_PDF_SYS_LINK_VISIBILITY_DEFAULT);
 590     $print_pdf_sys_link_pages = variable_get('print_pdf_sys_link_pages', PRINT_PDF_SYS_LINK_PAGES_DEFAULT);
 591
 592     return _print_page_match($print_pdf_sys_link_visibility, $_GET['q'], $print_pdf_sys_link_pages);
 593   }
 594   return FALSE;
 595 }
 596
 597 function _print_pdf_wkhtmltopdf_version() {
 598   $print_pdf_pdf_tool = variable_get('print_pdf_pdf_tool', PRINT_PDF_PDF_TOOL_DEFAULT);
 599   $descriptor = array(0 => array('pipe', 'r'), 1 => array('pipe', 'w'), 2 => array('pipe', 'w'));
 600
 601   $cmd = realpath($print_pdf_pdf_tool) . ' --version';
 602   $process = proc_open($cmd, $descriptor, $pipes, NULL, NULL);
 603   if (is_resource($process)) {
 604     $out = preg_match('!.*?(\d+\.\d+\.\d+).*$!m', stream_get_contents($pipes[1]), $matches);
 605     fclose($pipes[0]);
 606     fclose($pipes[1]);
 607     fclose($pipes[2]);
 608     $retval = proc_terminate($process);
 609   }
 610
 611   return ($matches[1]);
 612 }