legacy.module in Drupal 4

Provides legacy handlers for upgrades from older Drupal installations.
File

modules/legacy.module
View source
<?php

/**
 * @file
 * Provides legacy handlers for upgrades from older Drupal installations.
 */

/**
 * Implementation of hook_help().
 */
function legacy_help($section) {
  switch ($section) {
    case 'admin/help#legacy':
      $output = '<p>' . t('The legacy module provides legacy handlers for upgrades from older installations.  These handlers help automatically redirect references to pages from old installations and prevent <em>page not found</em> errors for your site.') . '</p>';
      $output .= '<p>' . t('The legacy module handles legacy style taxonomy page, taxonomy feed, and blog feed paths.  It also handles URL upgrades from Drupal 4.1.   It rewrites old-style URLs to new-style URLs (clean URLs). ') . '</p>';
      $output .= t('<p>Example Mappings:</p>
<ul>
<li><em>taxonomy/page/or/52,97</em> to <em>taxonomy/term/52+97</em>.</li>
<li><em>taxonomy/feed/or/52,97</em> to <em>taxonomy/term/52+97/0/feed</em>.</li>
<li><em>blog/feed/52</em> to <em>blog/52/feed</em>.</li>
<li><em>node/view/52</em> to <em>node/52</em>.</li>
<li><em>book/view/52</em> to <em>node/52</em>.</li>
<li><em>user/view/52</em> to <em>user/52</em>.</li>
</ul>
');
      $output .= '<p>' . t('Legacy module has no configurable options.') . '</p>';
      $output .= '<p>' . t('For more information please read the configuration and customization handbook <a href="%legacy">Legacy page</a>.', array(
        '%legacy' => 'http://drupal.org/handbook/modules/legacy/',
      )) . '</p>';
      return $output;
    case 'admin/modules#description':
      return t('Provides legacy handlers for upgrades from older Drupal installations.');
  }
}

/**
 * Implementation of hook_menu().
 *
 * Registers menu paths used in earlier Drupal versions.
 */
function legacy_menu($may_cache) {
  $items = array();
  if ($may_cache) {

    // Map "taxonomy/page/or/52,97" to "taxonomy/term/52+97".
    $items[] = array(
      'path' => 'taxonomy/page',
      'title' => t('taxonomy'),
      'callback' => 'legacy_taxonomy_page',
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );

    // Map "taxonomy/feed/or/52,97" to "taxonomy/term/52+97/0/feed".
    $items[] = array(
      'path' => 'taxonomy/feed',
      'title' => t('taxonomy'),
      'callback' => 'legacy_taxonomy_feed',
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );

    // Map "blog/feed/52" to "blog/52/feed".
    $items[] = array(
      'path' => 'blog/feed',
      'title' => t('blog'),
      'callback' => 'legacy_blog_feed',
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );
  }
  else {

    // Map "node/view/52" to "node/52".
    $items[] = array(
      'path' => 'node/view',
      'title' => t('view'),
      'callback' => 'drupal_goto',
      'callback arguments' => array(
        'node/' . arg(2),
        NULL,
        NULL,
      ),
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );

    // Map "book/view/52" to "node/52".
    $items[] = array(
      'path' => 'book/view',
      'title' => t('view'),
      'callback' => 'drupal_goto',
      'callback arguments' => array(
        'node/' . arg(2),
        NULL,
        NULL,
      ),
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );

    // Map "user/view/52" to "user/52".
    $items[] = array(
      'path' => 'user/view',
      'title' => t('view'),
      'callback' => 'drupal_goto',
      'callback arguments' => array(
        'user/' . arg(2),
        NULL,
        NULL,
      ),
      'access' => TRUE,
      'type' => MENU_CALLBACK,
    );
  }
  return $items;
}

/**
 * Menu callback; redirects users to new taxonomy page paths.
 */
function legacy_taxonomy_page($operation = 'or', $str_tids = '') {
  if ($operation == 'or') {
    $str_tids = str_replace(',', '+', $str_tids);
  }
  drupal_goto('taxonomy/term/' . $str_tids);
}

/**
 * Menu callback; redirects users to new taxonomy feed paths.
 */
function legacy_taxonomy_feed($operation = 'or', $str_tids = '') {
  if ($operation == 'or') {
    $str_tids = str_replace(',', '+', $str_tids);
  }
  drupal_goto('taxonomy/term/' . $str_tids . '/0/feed');
}

/**
 * Menu callback; redirects users to new blog feed paths.
 */
function legacy_blog_feed($str_uid = '') {

  // if URL is of form blog/feed/52 redirect
  // if URL is of form blog/feed we have to call blog_feed_last().
  if (is_numeric($str_uid)) {
    drupal_goto('blog/' . $str_uid . '/feed');
  }
  else {
    module_invoke('blog', 'feed_last');
  }
}

/**
 * Implementation of hook_filter(). Handles URL upgrades from Drupal 4.1.
 */
function legacy_filter($op, $delta = 0, $format = -1, $text = '') {
  switch ($op) {
    case 'list':
      return array(
        t('Legacy filter'),
      );
    case 'description':
      return t('Replaces URLs from Drupal 4.1 (and lower) with updated equivalents.');
    case 'process':
      return _legacy_filter_old_urls($text);
    case 'settings':
      return;
    default:
      return $text;
  }
}

/**
 * Rewrite legacy URLs.
 *
 * This is a *temporary* filter to rewrite old-style URLs to new-style
 * URLs (clean URLs).  Currently, URLs are being rewritten dynamically
 * (ie. "on output"), however when these rewrite rules have been tested
 * enough, we will use them to permanently rewrite the links in node
 * and comment bodies.
 */
function _legacy_filter_old_urls($text) {
  if (!variable_get('rewrite_old_urls', 0)) {
    return $text;
  }
  global $base_url;
  $end = substr($base_url, 12);
  if (variable_get('clean_url', '0') == '0') {

    // Relative URLs:
    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("\"(node)\\.php\\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "\"?q=\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2/\\4/\\6", $text);
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2/\\4", $text);
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2", $text);

    // Absolute URLs:
    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("{$end}/(node)\\.php\\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "{$end}/?q=\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "{$end}/?q=\\2/\\4/\\6", $text);
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "{$end}/?q=\\2/\\4", $text);
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"{$end}/?q=\\2", $text);
  }
  else {

    // Relative URLs:
    // Rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("\"(node)\\.php\\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "\"\\1/view/\\2/\\4", $text);

    // Rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2/\\4/\\6", $text);
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2/\\4", $text);
    $text = ereg_replace("\"module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2", $text);

    // Absolute URLs:
    // Rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("{$end}/(node)\\.php\\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "{$end}/\\1/view/\\2/\\4", $text);

    // Rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "{$end}/\\2/\\4/\\6", $text);
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "{$end}/\\2/\\4", $text);
    $text = ereg_replace("{$end}/module\\.php\\?(&?[[:alpha:]]+=([[:alnum:]]+))", "{$end}/\\2", $text);
  }
  return $text;
}
Functions

Name	Description
legacy_blog_feed	Menu callback; redirects users to new blog feed paths.
legacy_filter	Implementation of hook_filter(). Handles URL upgrades from Drupal 4.1.
legacy_help	Implementation of hook_help().
legacy_menu	Implementation of hook_menu().
legacy_taxonomy_feed	Menu callback; redirects users to new taxonomy feed paths.
legacy_taxonomy_page	Menu callback; redirects users to new taxonomy page paths.
_legacy_filter_old_urls	Rewrite legacy URLs.
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legacy.module in Drupal 4

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