EDIT

<?php

// $Id$

/*

 * @file

 * cdm_mediauri.module

 * 

 *

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy

 * http://www.e-taxonomy.eu

 *

 */

/**

 * Implementation of hook_menu()

 */

function cdm_mediauri_menu($may_cache) {

  $items = array();

  if ($may_cache) {

   $items[] = array(

      'path' => 'admin/settings/cdm_mediauri',

      'title' => t('CDM Media URI Conversion'),

      'description' => t('Media URI Conversion Rules'),

      'access' => user_access('administer cdm_dataportal'),

      'callback' => 'cdm_mediauri_overview',

      'type' => MENU_NORMAL_ITEM,

    );

  $items[] = array(

      'path' => 'admin/settings/cdm_mediauri/list',

      'title' => t('List'),

      'description' => t('Media URI Conversion Rules'),

      'access' => user_access('administer cdm_dataportal'),

      'callback' => 'cdm_mediauri_overview',

      'weight' => 1,

      'type' => MENU_DEFAULT_LOCAL_TASK,

    );

    $items[] = array(

      'path' => 'admin/settings/cdm_mediauri/add',

      'title' => t('Add Rule'),

      'description' => t('Add Media URI Conversion Rule'),

      'access' => user_access('administer cdm_dataportal'),

      'callback' => 'drupal_get_form',

      'callback arguments' => array('cdm_mediauri_rule_add'),

      'weight' => 2,

      'type' => MENU_LOCAL_TASK,

    );

     $items[] = array(

      'path' => 'admin/settings/cdm_mediauri/edit',

      'access' => user_access('administer cdm_dataportal'),

      'callback' => 'drupal_get_form',

      'callback arguments' => array('cdm_mediauri_rule_edit'),

      'type' => MENU_CALLBACK,

    );

     $items[] = array(

      'path' => 'admin/settings/cdm_mediauri/delete',

      'access' => user_access('administer cdm_dataportal'),

      'callback' => 'drupal_get_form',

      'callback arguments' => array('cdm_mediauri_rule_delete'),

      'type' => MENU_CALLBACK,

    );

    $rules = cdm_mediauri_rules();

    foreach($rules as $rule){

      if($rule['embed_html'] && $rule['path']){

        $items[] = array(

          'path' => $rule['path'],

          'access' => true, //TODO restrict access

          'callback' => 'cdm_mediauri_view_embed',

          'type' => MENU_CALLBACK,

        );

      }

    }

  }

  return $items;

}

/**

 * Returns an overview list of existing media uri rules

 */

function cdm_mediauri_overview($rules = false) {

  if(!$rules){

    $rules = cdm_mediauri_rules();

  }

  $header = array(t('Pattern'), t('Replacement'), t('Operations'));

  $rid = -1;

  if(count($rules)){

  foreach ($rules as $rule) {

      $rid++;

      $rows[] = array($rule['pattern'], $rule['replace'], l('edit', 'admin/settings/cdm_mediauri/edit/'. $rid).' | '.l('delete', 'admin/settings/cdm_mediauri/delete/'. $rid));

    }

  }

  else {

     $rows[] = array(array('data' => '<em>' 

     . t('There are no existing media uri conversion rules. You may add some rule: <a href="@add">add rule</a>', array('@add' => url('admin/settings/cdm_mediauri/add'))) . '</em>', 'colspan' => 3) );

  }

  return theme('table', $header, $rows);

}

/**

 * Menu callback; add new mediauri rule.

 */

function cdm_mediauri_rule_add() {

  $form = cdm_mediauri_rule_edit_form('new');

  return system_settings_form($form);

}

function cdm_mediauri_rule_edit($rid) {

  $form = cdm_mediauri_rule_edit_form($rid);

  return system_settings_form($form);

}

function cdm_mediauri_rule_add_submit($form_id, $form_values) {

  if($form_values['rid'] == 'new'){

    $rules = cdm_mediauri_rules();

    $rules[] = $form_values['rule'];

    variable_set('cdm_mediauri_rules', $rules);

       drupal_set_message('Rule added');

  }else {

    drupal_set_message('Cannot add rule', 'error');

  }

  return 'admin/settings/cdm_mediauri';

}

function cdm_mediauri_rule_edit_submit($form_id, $form_values) {

  if(is_numeric($form_values['rid'])){

    $rules = cdm_mediauri_rules();

    // determine if the menu has changed

    if($rules[$form_values['rid']]['embed'] != $form_values['rule']['embed'] || $rules[$form_values['rid']]['path'] != $form_values['rule']['path']) {    

      menu_rebuild();

      drupal_set_message('Menu Rebuild');

    }

    $rules[$form_values['rid']] = $form_values['rule'];

    variable_set('cdm_mediauri_rules', $rules);

     drupal_set_message('Rule saved');

  }else {

    drupal_set_message('Cannot save rule (invalid rule id)', 'error');

  }

  return 'admin/settings/cdm_mediauri';

}

function cdm_mediauri_rule_delete_submit($form_id, $form_values) {

  if(is_numeric($form_values['rid'])){

    $rules = cdm_mediauri_rules();

    unset($rules[$form_values['rid']]);

    variable_set('cdm_mediauri_rules', $rules);

    drupal_set_message('Rule deleted');

  } else {

    drupal_set_message('Cannot delete rule (invalid rule id)', 'error');

  }

  return 'admin/settings/cdm_mediauri';

}

/**

 * Menu callback; confirm deletion of mediauri rule.

 */

function cdm_mediauri_rule_delete($rid = 0) {

  $rules = cdm_mediauri_rules();

  $form['rid'] = array('#type' => 'hidden', '#value' => $rid);

  return confirm_form($form, t('Are you sure you want to delete the following rule:'.cdm_mediauri_overview(array($rules[$rid]))), 'admin/settings/cdm_mediauri', '', t('Delete'), t('Cancel'));

}

function cdm_mediauri_rule_edit_form($rid = 'new'){

  if($rid == 'new'){

    // ---- little code snipped used to import default rules during development 

    $default_rule_id = FALSE; // 0 or 1 or FALSE

    if($default_rule_id !== false){

      $default_rules = cdm_mediauri_rules(true);

      $rule = $default_rules[$default_rule_id];

    }

    // --- END

    if(!$rule) {

      $rule = array();

      $rule['type'] = 'empty';

      $rule['pattern'] = '';

      $rule['replace'] = '';

      $rule['prefix'] = ''; 

      $rule['affix'] = '';

      $rule['url_encode'] = 0; 

      $rule['embed_html'] = 0;

      $rule['path'] = '';

      $rule['title'] = '';

    }

  } else {

    $rules = cdm_mediauri_rules(); 

    $rule = $rules[$rid];

  }

  $form = array();

  /*

   * rule

   * 

   *  ['type']: values(preview, webapp, media)

   *  ['size_x'], ['size_y']: dimensions of preview image in px

   *  ['pattern']: php PCRE regex pattern (see: http://www.php.net/manual/reference.pcre.pattern.syntax.php)

   *  ['replace']: replacement string 

   *  ['prefix']: string by which the converted url is to be prefixed

   *  ['affix']: string by which the converted url is to be affixed

   *  ['url_encode']: values(TRUE, FALSE) if the converted url is to be url encoded

   *  ['embed_html']: embes the construct of prefix + url + affix into the page as plain html

   * 

   */

  $form['rid'] = array(

    '#type' => 'hidden',

    '#value' => $rid,

   );

  $form['rule'] = array(

    '#type' => 'fieldset',

    '#title' => ($rule['type'] == 'empty' ? t('New Rule') : t('Rule '.$rid)),

    '#tree' => TRUE,

  );

  $form['rule']['type'] =  array(

    '#type'  => 'select',

    '#title' => t('Type'),

    '#default_value' => $rule['type'],

    '#options' => array(

        'preview' => t('Preview Quality'),

        'webapp' => t('Web Application'),

        ),

    '#description'   => t('The type media representation.'),

  );

   $form['rule']['pattern'] =  array(

    '#type' => 'textarea',

    '#title'         => t('Pattern'),

    '#description'   => t('php PCRE regex pattern (see: ').l('php manual', 'http://www.php.net/manual/reference.pcre.pattern.syntax.php').')',

    '#default_value' => $rule['pattern'],

    '#rows' => 1

  );

  $form['rule']['replace'] =  array(

    '#type' => 'textarea',

    '#title'         => t('Replacement'),

    '#default_value' => $rule['replace'],

    '#rows' => 1,

   );

  //  ['embed_html'] = 1;

  $form['rule']['embed_html'] =  array(

    '#type' => 'checkbox',

    '#title'         => t('Embed'),

    '#default_value' => $rule['embed_html'],

    '#description'   => t('Embed the construct of prefix + url + affix into the page as plain html')

   );

   $form['rule']['url_encode'] =  array(

    '#type' => 'checkbox',

    '#title'         => t('Url Encode'),

    '#default_value' => $rule['url_encode'],

    '#description'   => t('Whether the converted url is to be url encoded')

   );

  $form['rule']['path'] =  array(

    '#type'          => 'textfield',

    '#title'         => t('Drupal Path'),

    '#default_value' => $rule['path'],

    '#description'   => t('Drupal Path under which the media is to be embedded into a page')

  );

  $form['rule']['title'] =  array(

    '#type'          => 'textfield',

    '#title'         => t('Page Title'),

    '#default_value' => $rule['title'],

    '#description'   => t('Page Title')

  );

  $form['rule']['prefix'] =  array(

    '#type' => 'textarea',

    '#title'   => t('Prefix'),

    '#default_value' => $rule['prefix'],

    '#rows' => 1,

  );

    $form['rule']['affix'] =  array(

    '#type' => 'textarea',

    '#title'   => t('Affix'),

    '#default_value' => $rule['affix'],

    '#rows' => 1,

  );

   $form['rule']['size_x'] =  array(

    '#type' => 'textfield',

    '#title'         => t('Preview Image Width'),

    '#default_value' => $rule['size_x'],

    '#disabled' => $rule['type'] != 'preview',

    '#description'   => t('Width of preview image in px'),

    '#size' => 4, 

  );

  $form['rule']['size_y'] =  array(

    '#type' => 'textfield',

    '#title'         => t('Preview Image Height'),

    '#default_value' => $rule['size_y'],

    '#disabled' => $rule['type'] != 'preview',

    '#description'   => t('Height of preview image in px'),

    '#size' => 4, 

  );

  return $form;

}

function cdm_mediauri_rules($default = false){

  /*

   * rules

   * 

   *  ['type']: values(preview, webapp, media)

   *  ['size_x'], ['size_y']: dimensions of preview image in px

   *  ['pattern']: php PCRE regex pattern (see: http://www.php.net/manual/reference.pcre.pattern.syntax.php)

   *  ['replace']: replacement string 

   *  ['prefix']: string by which the converted url is to be prefixed

   *  ['affix']: string by which the converted url is to be affixed

   *  ['url_encode']: values(TRUE, FALSE) if the converted url to be url encoded

   *  ['embed_html']: embes the construct of prefix + url + affix into the page as plain html

   * 

   */

  if($default){

  // default rules

  $rule1 = array();

  $rule1['type'] = 'preview';

  $rule1['pattern'] = '/^(http:\/\/ww2.bgbm.org\/herbarium\/images(?:\/\w+)(?:\/\d+){4})(\/)(.*)$/';

  $rule1['replace'] = '$1/thumbs/$3';

  $rule1['size_x'] = 125;

  $rule1['size_Y'] = 200;

  $rule2 = array();

  $rule2['type'] = 'webapp';

  $rule2['pattern'] = '/^http:\/\/ww2.bgbm.org\/herbarium\/images\/((?:\w+\/)(?:\d+\/){4}[\w_]+?\.)(.*)$/';

  $rule2['replace'] = '$1fpx';

  $rule2['prefix'] = '<div style="float: left; width: 10em;">

  <p>© BGBM: <br>

  Access is granted under the following conditions:<br>

  The images may not passed on to any third party without our written

  consent and due mention of the copyright restrictions, and may not be

  used for commercial or non-scientific purposes. Reproduction in

  scientific publications is authorized on the condition that the source

  and the copyright are fully acknowledged:<br>

  © Botanischer Garten und Botanisches Museum Berlin-Dahlem, FU Berlin.</li>

</p>

<p><a href="http://www.bgbm.org/bgbm/verantwo_e.htm"

    class="leftnavi" title="Contact">Contact</a> | <a href="http://www.bgbm.org/bgbm/imprint.htm"

    class="leftnavi" title="Impressum">Imprint</a> | <a href="http://www.bgbm.org/disclaim_e.htm" class="leftnavi"

    title="Disclaimer">Disclaimer</a>

</p>

</div><div><embed width="490" height="700" align="middle" type="application/x-shockwave-flash" 

       pluginspage="http://www.macromedia.com/go/getflashplayer" name="FSIViewer" 

       bgcolor="black" quality="high" play="true" 

       src="http://ww2.bgbm.org/fsi/fsi.swf?cfg=plugin2&FPXSrc='; 

  $rule2['affix'] = '&FPXWidth=2801&FPXHeight=4478&Effects=qlt%3D85&InitialView=&Measure_ImageWidth=270.0&Measure_Suffix=%20mm"/></div>';

  $rule2['url_encode'] = 1; 

  $rule2['embed_html'] = 1;

  $rule2['path'] = 'bgbm.org/herbarium';

  return array($rule1, $rule2);

  } else {

    return variable_get('cdm_mediauri_rules', array());

  }

}

/**

 * Converts a media uri according to all matching conversion rules which are currently defined.

 * 

 * Format of a returned array element:

 * 

 *  $return_array[{type}] { // values for {type}:(preview, webapp, media, original)

 *      ['size_x'],         // dimensions of preview image in px

 *      ['size_y'],         // dimensions of preview image in px

 *      ['uri']             // the uri possibly prefixed with path

 *      ['embed_html']      // the uri embedded into some string

 *  }

 * 

 * @return returns an associative array of the original media uri and all convered 

 *    whereas the rule type becomes the array key of the array entries.

 *    All uris are again packed into associative arrays by means to submit 

 *    additional information as defined in the rules applied. 

 */

function cdm_mediauri_conversion($mediaUri){

  $rules = cdm_mediauri_rules();

  $muris = array();

  $muris['original'] = array('uri' => $mediaUri, 'size_x'=>null, 'size_y'=>null);

  foreach($rules as $rule){

      $uri_converted = preg_replace($rule['pattern'], $rule['replace'], $mediaUri);

      if($uri_converted != $mediaUri){

        if(isset($rule['url_encode']) && $rule['url_encode']){

          $uri_converted = urlencode($uri_converted);

        }

        $muris[$rule['type']] = array('uri'=>$uri_converted, 'size_x'=>$rule['size_x'], 'size_y'=>$rule['size_y']);

        if(isset($rule['embed_html']) && $rule['embed_html']){

          if($rule['path']){

            // embed later on other page

            $muris[$rule['type']]['uri'] = $rule['path'].'/'.$uri_converted;

          } else {

            // direct embed

            $muris[$rule['type']]['embed_html'] =  $rule['prefix'].$uri_converted.$rule['affix'];

          }

        }

      }

  }

  return $muris;

}

function cdm_mediauri_view_embed($uri){

  $path = '';

  for($i = 0; ($arg = arg($i)); $i++){

    if($arg == $uri){

      break;

    } else {

      $path .= ($path ? '/': '').$arg;

    }

  }

  $rule = false;

  foreach(cdm_mediauri_rules() as $r){

    if($r['embed_html'] && $r['path'] == $path){

      $rule = $r;

      break;

    }

  }

  if($rule){

    drupal_set_title($rule['title']);

    return $rule['prefix'].$uri.$rule['affix'];

  }

  return 'ERROR:'.$path.$uri;

}