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pdfviewer.php
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pdfviewer.php
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<?php
/**
* Inline PDF viewer plugin
*
* Render PDF files directly in the preview window
* by using the JavaScript PDF Reader pdf.js by andreasgal (http://mozilla.github.com/pdf.js)
*
* @version 0.1
* @author Thomas Bruederli <bruederli@kolabsys.com>
*
* Copyright (C) 2013, Kolab Systems AG
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class pdfviewer extends rcube_plugin
{
public $task = 'mail|calendar|tasks|logout';
private $pdf_mimetypes = array(
'application/pdf',
'application/x-pdf',
'application/acrobat',
'applications/vnd.pdf',
'text/pdf',
'text/x-pdf',
);
/**
* Plugin initialization
*/
function init()
{
// pdf.js only supports IE9 or higher
$ua = new rcube_browser;
if ($ua->ie && $ua->ver < 9)
return;
// extend list of mimetypes that should open in preview
$rcmail = rcube::get_instance();
if ($rcmail->action == 'preview' || $rcmail->action == 'show' || $rcmail->task == 'calendar' || $rcmail->task == 'tasks') {
$mimetypes = (array)$rcmail->config->get('client_mimetypes');
$rcmail->config->set('client_mimetypes', array_merge($mimetypes, $this->pdf_mimetypes));
}
// only use pdf.js if the browser doesn't support inline PDF rendering
if (empty($_SESSION['browser_caps']['pdf']) || $ua->opera)
$this->add_hook('message_part_get', array($this, 'get_part'));
$this->add_hook('message_part_structure', array($this, 'part_structure'));
}
/**
* Handler for message attachment download
*/
public function get_part($args)
{
// redirect to viewer/viewer.html
if (!$args['download'] && $args['mimetype'] && empty($_GET['_load']) && in_array($args['mimetype'], $this->pdf_mimetypes)) {
$file_url = $this->abs_url(rcube::get_instance()->url($_GET + array('_load' => 1)));
header('Location: ' . $this->abs_url($this->urlbase . 'viewer/viewer.html') . '?file=' . urlencode($file_url));
$args['abort'] = true;
}
return $args;
}
/**
* Hook for MIME message parsing.
* This allows us to fix mimetypes of PDF attachments
*/
public function part_structure($args)
{
if (!empty($args['structure']->parts)) {
foreach ($args['structure']->parts as $i => $part) {
$this->fix_mime_part($args['structure']->parts[$i], $args['object']);
}
}
else if ($args['structure']->mimetype != $args['mimetype']) {
$args['mimetype'] = $args['structure'];
}
return $args;
}
/**
* Helper method to fix potentially invalid mimetypes of PDF attachments
*/
private function fix_mime_part($part, $message)
{
// Some versions of Outlook create garbage Content-Type:
// application/pdf.A520491B_3BF7_494D_8855_7FAC2C6C0608
if (preg_match('/^application\/pdf.+/', $part->mimetype)) {
$part->mimetype = 'application/pdf';
}
// try to fix invalid application/octet-stream mimetypes for PDF attachments
if ($part->mimetype == 'application/octet-stream' && preg_match('/\.pdf$/', strval($part->filename))) {
$body = $part->body ? $part->body : $message->get_part_content($part->mime_id, null, true, 2048);
$real_mimetype = rcube_mime::file_content_type($body, $part->filename, $part->mimetype, true, true);
if (in_array($real_mimetype, $this->pdf_mimetypes)) {
$part->mimetype = $real_mimetype;
}
}
list($part->ctype_primary, $part->ctype_secondary) = explode('/', $part->mimetype);
}
/**
* Build an absolute URL with the given relative path
*/
private function abs_url($relpath = '')
{
$webroot = '';
if (dirname($_SERVER['SCRIPT_NAME']) != '/')
$webroot .= dirname($_SERVER['SCRIPT_NAME']) . '/';
return $webroot . preg_replace('!^\./!', '', $relpath);
}
}

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