[PLUGIN] SEO Strict URLs

&editDocLinks=Edit document links;int;1 &makeFolders=Rewrite containers as folders;int;1 &override=Enable manual overrides;int;0 &overrideTV=Override TV name;string;seoOverride

// Strict URLs
// version 1.0
// Enforces the use of strict URLs to prevent duplicate content.
// By Jeremy Luebke @ www.xuru.com
// Contributions by Brian Stanback @ www.stanback.net

// On Install: Check the "OnWebPageInit" & "OnWebPagePrerender" boxes in the System Events tab.
// Plugin configuration: &editDocLinks=Edit document links;int;1 &makeFolders=Rewrite containers as folders;int;1 &override=Enable manual overrides;int;0 &overrideTV=Override TV name;string;seoOverride

// For overriding documents, create a new template variabe (TV) named seoOverride with the following options:
//    Input Type: DropDown List Menu
//    Input Option Values: Disabled==-1||Base Name==0||Append Extension==1||Folder==2
//    Default Value: -1
// NOTE: You must set "Enable manual overrides" in plugin configuration to 1 to enable this TV

//  # Include the following in your .htaccess file
//  # Replace "example.com" &  "example\.com" with your domain info
//  RewriteCond %{HTTP_HOST} .
//  RewriteCond %{HTTP_HOST} !^www\.example\.com [NC]
//  RewriteRule (.*) http://www.example.com/$1 [R=301,L] 

// Begin plugin code
$e = &$modx->event;

if ($e->name == 'OnWebPageInit') 
{
   $myProtocol = ($_SERVER['HTTPS'] == 'on') ? 'https' : 'http';
   $s = $_SERVER['REQUEST_URI'];
   $parts = explode("?", $s);  

   $documentIdentifier = ($modx->documentIdentifier) ? $modx->documentIdentifier : $modx->config['error_page'];  // Set error page document ID if page is not found
   $alias = $modx->aliasListing[$documentIdentifier]['alias'];
   if ($makeFolders) $isfolder = (count($modx->getChildIds($documentIdentifier, 1)) > 0) ? 1 : 0;

   if ($override && $overrideOption = $modx->getTemplateVarOutput($overrideTV, $documentIdentifier))
   {
      switch ($overrideOption[$overrideTV])
      {
         case 0:
            $isoverride = 1;
            break;
         case 1:
            $isfolder = 0;
            break;
         case 2:
            $makeFolders = 1;
            $isfolder = 1;
      }
   }

   if ($isoverride)
   {
      $strictURL = preg_replace('/[^\/]+$/', $alias, $modx->makeUrl($documentIdentifier));
   }
   elseif ($isfolder && $makeFolders)
   {
      $strictURL = preg_replace('/[^\/]+$/', $alias, $modx->makeUrl($documentIdentifier)) . "/";
   }
   else
   {
      $strictURL = $modx->makeUrl($documentIdentifier);
   }

   $myDomain = $myProtocol . "://" . $_SERVER['HTTP_HOST'];
   $newURL = $myDomain . $strictURL;
   $requestedURL = $myDomain . $parts[0];

   if ($documentIdentifier == $modx->config['site_start'])
   {
      if ($requestedURL != $modx->config['site_url'])
      {
         // Force redirect of site start
         header("HTTP/1.1 301 Moved Permanently");
         $qstring = preg_replace("#(^|&)(q|id)=[^&]+#", '', $parts[1]);  // Strip conflicting id/q from query string
         if ($qstring) header('Location: ' . $modx->config['site_url'] . '?' . $qstring);
         else header('Location: ' . $modx->config['site_url']);
         exit;
      }
   }
   elseif ($parts[0] != $strictURL)
   {
      // Force page redirect
      header("HTTP/1.1 301 Moved Permanently");
      $qstring = preg_replace("#(^|&)(q|id)=[^&]+#", '', $parts[1]);  // Strip conflicting id/q from query string
      if ($qstring) header('Location: ' . $strictURL . '?' . $qstring);
      else header('Location: ' . $strictURL);
      exit;
   }
}
elseif ($e->name == 'OnWebPagePrerender')
{
   if ($editDocLinks)
   {
      $myDomain = $_SERVER['HTTP_HOST'];
      $furlSuffix = $modx->config['friendly_url_suffix'];
      $baseUrl = $modx->config['base_url'];
      $o = &$modx->documentOutput; // get a reference of the output

      // Reduce site start to base url
      $overrideAlias = $modx->aliasListing[$modx->config['site_start']]['alias'];
      $overridePath = $modx->aliasListing[$modx->config['site_start']]['path'];
      $o = preg_replace("#((href|action)=\"|$myDomain)($baseUrl)?($overridePath/)?$overrideAlias$furlSuffix#", '${1}' . $baseUrl, $o);

      if ($override)
      {
         // Replace manual override links
         $sql = "SELECT tvc.contentid as id, tvc.value as value FROM " . $modx->getFullTableName('site_tmplvars') . " tv ";
         $sql .= "INNER JOIN " . $modx->getFullTableName('site_tmplvar_templates') . " tvtpl ON tvtpl.tmplvarid = tv.id ";
         $sql .= "LEFT JOIN " . $modx->getFullTableName('site_tmplvar_contentvalues') . " tvc ON tvc.tmplvarid = tv.id ";
         $sql .= "LEFT JOIN " . $modx->getFullTableName('site_content') . " sc ON sc.id = tvc.contentid ";
         $sql .= "WHERE sc.published = 1 AND tvtpl.templateid = sc.template AND tv.name = '$overrideTV'";
         $results = $modx->dbQuery($sql);
         while ($row = $modx->fetchRow($results))
         {
            $overrideAlias = $modx->aliasListing[$row['id']]['alias'];
            $overridePath = $modx->aliasListing[$row['id']]['path'];
            switch ($row['value'])
            {
               case 0:
                  $o = preg_replace("#((href|action)=\"($baseUrl)?($overridePath)?|$myDomain$baseUrl$overridePath/?)$overrideAlias$furlSuffix#", '${1}' . $overrideAlias, $o);
                  break;
               case 2:
                  $o = preg_replace("#((href|action)=\"($baseUrl)?($overridePath)?|$myDomain$baseUrl$overridePath/?)$overrideAlias$furlSuffix/?#", '${1}' . rtrim($overrideAlias, '/') . '/', $o);
                  break;
            }
         }
      }

      if ($makeFolders)
      {
         // Replace container links
         foreach ($modx->documentListing as $id)
         {
            if (count($modx->getChildIds($id, 1)))
            {
                  $overrideAlias = $modx->aliasListing[$id]['alias'];
                  $overridePath = $modx->aliasListing[$id]['path'];
                  $o = preg_replace("#((href|action)=\"($baseUrl)?($overridePath)?|$myDomain$baseUrl$overridePath/?)$overrideAlias$furlSuffix/?#", '${1}' . rtrim($overrideAlias, '/') . '/', $o);
            }
         }
      }
   }
}

   $strictURL = $modx->makeUrl($modx->documentIdentifier);
   $strictURL = str_replace(".css.html",".css",$strictURL);
   $strictURL = str_replace(".xml.html",".xml",$strictURL);