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   1  <?php
   2  // $Id: project_legacy_paths.module,v 1.1 2009/01/12 22:57:50 dww Exp $
   3  
   4  /**
   5   * @file Redirect project browsing paths from the Drupal 5 form to the Drupal 6 form.
   6   */
   7  
   8  function project_legacy_paths_menu(){
   9    $items = array();
  10  
  11    // Project browsing pages
  12    if (project_use_taxonomy()) {
  13      $items['project/%project_legacy_paths_top_level_term/%'] = array(
  14        'access callback' => TRUE,
  15        'page callback' => 'project_legacy_paths_page_callback',
  16        'page arguments' => array(1, 2),
  17      );
  18      $items['project/%project_legacy_paths_top_level_term/%/%'] = array(
  19        'access callback' => TRUE,
  20        'page callback' => 'project_legacy_paths_page_callback',
  21        'page arguments' => array(1, 2, 3),
  22      );
  23    }
  24    return $items;
  25  }
  26  
  27  /**
  28   * Menu load function for project type top level terms (eg. modules, themes, etc.).
  29   */
  30  function project_legacy_paths_top_level_term_load($term_name) {
  31    $project_type_vid = _project_get_vid();
  32    if (empty($project_type_vid)) {
  33      return FALSE;
  34    }
  35  
  36    $db_result = db_query(db_rewrite_sql("SELECT * FROM {term_data} t INNER JOIN {term_hierarchy} th ON t.tid = th.tid WHERE LOWER(t.name) = LOWER('%s') AND th.parent = 0 AND t.vid = %d", 't', 'tid'), trim($term_name), $project_type_vid);
  37    $result = array();
  38    while ($term = db_fetch_object($db_result)) {
  39      $result[] = $term;
  40    }
  41    if (!empty($result)) {
  42      return $result[0];
  43    }
  44    else {
  45      return FALSE;
  46    }
  47  }
  48  
  49  /**
  50   * Implementation of hook_project_sort_methods().
  51   *
  52   * The code in this function is the (slightly modified) relevant piece of code
  53   * from the project_project_sort_methods() function in the Drupal 5 version
  54   * of the project module.  This code is here because the Drupal 6
  55   * version of the project module no longer contains this function.
  56   */
  57  function project_legacy_paths_project_sort_methods($op, $method = NULL) {
  58    if ($op == 'methods') {
  59      $methods = array();
  60      $methods['name'] = 'project';
  61      $methods['date'] = 'project';
  62      // The D5 version put the next line within an if (project_use_taxonomy())
  63      // block, but since we're already checking for that in
  64      // project_legacy_paths_menu() there is no need to check again.
  65      $methods['category'] = 'project';
  66      return $methods;
  67    }
  68  }
  69  
  70  /**
  71   * Validate the arguments to see if they would have lead to an actual page
  72   * in the Drupal 5 version of the project module.  If not, the user
  73   * will be given a page not found error.  Otherwise, determine what the D6
  74   * URL would be and redirect the user there.
  75   */
  76  function project_legacy_paths_page_callback($top_level_term, $sort_method = NULL, $category_tid = NULL) {
  77    // Validate $sort_method.
  78    $sort_methods = module_invoke_all('project_sort_methods', 'methods');
  79    if (!empty($sort_methods) && !empty($sort_method)) {
  80      if (!array_key_exists($sort_method, $sort_methods)) {
  81        return MENU_NOT_FOUND;
  82      }
  83    }
  84    else {
  85      return MENU_NOT_FOUND;
  86    }
  87  
  88    // Validate $category_tid. 
  89    if (isset($category_tid)) {
  90      if (!is_numeric($category_tid)) {
  91        return MENU_NOT_FOUND;
  92      }
  93      
  94      // Since 'category' is the only sorting method that uses $category_tid, make
  95      // sure the sort method is 'category'.
  96      if ($sort_method != 'category') {
  97        return MENU_NOT_FOUND;
  98      }
  99  
 100      // Determine if $category_tid has $top_level_term as its parent.
 101      if (!db_result(db_query(db_rewrite_sql("SELECT t.tid FROM {term_data} t INNER JOIN {term_hierarchy} th ON t.tid = th.tid WHERE t.tid = %d AND th.parent = %d", 't', 'tid'), $category_tid, $top_level_term->tid))) {
 102        return MENU_NOT_FOUND;
 103      }
 104    }
 105  
 106    // At this point we know that all of the parameters to this function
 107    // are valid and would have returned a page in the D5 version of project.
 108    // Now, we just need to redirect to the appropriate URL.
 109  
 110    // @TODO: Below are several variables which we should not hard code.
 111    // We need to figure out how exactly we want to do this.  Perhaps put the code
 112    // below in a separate hook function or something.
 113    $base = 'project';
 114    $sort_by_identifier = 'sort_by';
 115    $project_type_term_identifier = 'type';
 116  
 117    $base_path = $base . '/' . strtolower($top_level_term->name);
 118    
 119    // Build an array with query key/value properties.
 120    $query = array();
 121    if ($sort_method == 'date') {
 122      $query[$sort_by_identifier] = 'changed';
 123    }
 124    elseif ($sort_method == 'name') {
 125      $query[$sort_by_identifier] = 'title';
 126    }
 127    elseif ($sort_method == 'category') {
 128      $query[$project_type_term_identifier] = $category_tid;
 129    }
 130    drupal_goto($base_path, $query, NULL, 301);
 131  }
 132