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