controllers/api/file/linkAction/DownloadLibraryFileLinkAction.inc.php

<?php
import('lib.pkp.classes.linkAction.LinkAction');

class DownloadLibraryFileLinkAction extends LinkAction {

   function DownloadLibraryFileLinkAction(&$request, &$libraryFile) {
      // Instantiate the redirect action request.
      $router =& $request->getRouter();
      import('lib.pkp.classes.linkAction.request.PostAndRedirectAction');
      $redirectRequest = new PostAndRedirectAction(
         $router->url(
            $request, null, 'api.file.FileApiHandler', 'enableLinkAction',
            null, $this->getActionArgs($libraryFile)),
         $router->url(
            $request, null, 'api.file.FileApiHandler', 'downloadLibraryFile',
            null, $this->getActionArgs($libraryFile))
      );

      // Configure the file link action.
      parent::LinkAction(
         'downloadFile', $redirectRequest, $libraryFile->getLocalizedName(),
         $libraryFile->getDocumentType()
      );
   }

   function getActionArgs(&$libraryFile) {
      assert(is_a($libraryFile, 'LibraryFile'));

      // Create the action arguments array.
      $args =  array('libraryFileId' => $libraryFile->getId());

      if ($libraryFile->getMonographId()) {
         $args['monographId'] = $libraryFile->getMonographId();
      }

      return $args;
   }
}

?>