From e4ce2258e120e79e1cdb6044ee28bc73f8dc6f7d Mon Sep 17 00:00:00 2001
From: Victor Dubiniuk <victor.dubiniuk@gmail.com>
Date: Fri, 28 Mar 2014 22:14:51 +0300
Subject: [PATCH] MS formats. First approach

---
 appinfo/app.php       | 35 ++++++++++++++++
 lib/config.php        | 42 +++++++++++++++++++
 lib/converter.php     | 94 +++++++++++++++++++++++++++++++++++++++++++
 lib/filter/office.php | 85 ++++++++++++++++++++++++++++++++++++++
 lib/helper.php        | 25 ++++++++++++
 5 files changed, 281 insertions(+)
 create mode 100644 lib/config.php
 create mode 100644 lib/converter.php
 create mode 100644 lib/filter/office.php

diff --git a/appinfo/app.php b/appinfo/app.php
index d2b5136c..fa8b41db 100755
--- a/appinfo/app.php
+++ b/appinfo/app.php
@@ -44,9 +44,44 @@ OC::$CLASSPATH['OCA\Documents\Download_Range'] = 'documents/lib/download/range.p
 OC::$CLASSPATH['OCA\Documents\Db_Session'] = 'documents/lib/db/session.php';
 OC::$CLASSPATH['OCA\Documents\Db_Member'] = 'documents/lib/db/member.php';
 OC::$CLASSPATH['OCA\Documents\Db_Op'] = 'documents/lib/db/op.php';
+OC::$CLASSPATH['OCA\Documents\Filter_Office'] = 'documents/lib/filter/office.php';
 
 //Script for registering file actions
 OCP\Util::addScript('documents', 'viewer/viewer');
 
+$docFilter = new OCA\Documents\Filter_Office(
+			array(
+				'read' => 
+					array (
+						'target' => 'application/vnd.oasis.opendocument.text',
+						'format' => 'odt:writer8',
+						'extension' => 'odt'
+					),
+				'write' => 
+					array (
+						'target' => 'application/msword',
+						'format' => 'doc',
+						'extension' => 'doc'
+					)
+			)
+);
+
+$docxFilter = new OCA\Documents\Filter_Office(
+		array (
+				'read' => 
+					array (
+						'target' => 'application/vnd.oasis.opendocument.text',
+						'format' => 'odt:writer8',
+						'extension' => 'odt'
+					),
+				'write' => 
+					array (
+						'target' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+						'format' => 'docx',
+						'extension' => 'docx'
+					)
+			)
+);
+
 //Listen to delete file signal
 OCP\Util::connectHook('OC_Filesystem', 'delete', "OCA\Documents\Storage", "onDelete");
diff --git a/lib/config.php b/lib/config.php
new file mode 100644
index 00000000..d8b7be4b
--- /dev/null
+++ b/lib/config.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * ownCloud - Documents App
+ *
+ * @author Victor Dubiniuk
+ * @copyright 2014 Victor Dubiniuk victor.dubiniuk@gmail.com
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ */
+
+namespace OCA\Documents;
+
+class Config {
+	const APP_NAME = 'documents';
+	
+	public static function getConverter(){
+		return self::getAppValue('converter', 'local');
+	}
+	
+	public static function setConverter($value){
+		return self::setAppValue('converter', $value);
+	}
+	
+	public static function getConverterUrl(){
+		return self::getAppValue('converter_url', 'http://localhost:16080');
+	}
+	
+	public static function setConverterUrl($value){
+		return self::setAppValue('converter_url', $value);
+	}
+
+	protected static function getAppValue($key, $default){
+		return \OCP\Config::getAppValue(self::APP_NAME, $key, $default);
+	}
+	
+	protected static function setAppValue($key, $value){
+		return \OCP\Config::setAppValue(self::APP_NAME, $key, $value);
+	}
+	
+}
\ No newline at end of file
diff --git a/lib/converter.php b/lib/converter.php
new file mode 100644
index 00000000..84c11d4f
--- /dev/null
+++ b/lib/converter.php
@@ -0,0 +1,94 @@
+<?php
+
+/**
+ * ownCloud - Documents App
+ *
+ * @author Victor Dubiniuk
+ * @copyright 2014 Victor Dubiniuk victor.dubiniuk@gmail.com
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ */
+
+namespace OCA\Documents;
+
+class Converter {
+	
+	public static function convert($input, $targetFilter, $targetExtension){
+		if (Config::getConverter() == 'local'){
+			$output = self::convertLocal($input, $targetFilter, $targetExtension);
+		} else {
+			$output = self::convertExternal($input, $targetExtension);
+		}
+		
+		if (empty($output)){
+			\OCP\Util::writeLog('Documents', 'Empty conversion output', \OCP\Util::WARN);
+			throw new \RuntimeException('Empty conversion output');
+		}
+		return $output;
+	}
+	
+	public static function checkConnection(){
+		$expected = file_get_contents(__DIR__ . '/response.odt');
+		$converted = self::convertExternal('');
+		
+		return $converted === $expected;
+	}
+	
+	/**
+	 * convert via openOffice hosted on the same server
+	 * @param string $input
+	 * @param string $targetFilter
+	 * @param string $targetExtension
+	 * @return string
+	 */
+	protected static function convertLocal($input, $targetFilter, $targetExtension){
+		$infile = \OCP\Files::tmpFile();
+		$outdir = \OCP\Files::tmpFolder();
+		$cmd = Helper::findOpenOffice();
+		$params = ' --headless --convert-to ' . $targetFilter . ' --outdir ' 
+				. escapeshellarg($outdir) 
+				. ' --writer '. escapeshellarg($infile)
+		;
+		
+		file_put_contents($infile, $input);
+		shell_exec($cmd . $params);
+		$output = file_get_contents($outdir . '/' . basename($infile) . '.' . $targetExtension);
+			
+		return $output;
+	}
+
+	/**
+	 * convert via format-filter-server installed on the same host with openOffice
+	 * @param string $input
+	 * @return string
+	 */
+	protected static function convertExternal($input, $targetExtension){
+		$options = array(
+			CURLOPT_RETURNTRANSFER => true,
+			CURLOPT_HEADER => false,
+			CURLOPT_FOLLOWLOCATION => true,
+			CURLOPT_ENCODING => "",
+			CURLOPT_AUTOREFERER => true,
+			CURLOPT_CONNECTTIMEOUT => 120,
+			CURLOPT_TIMEOUT => 120,
+			CURLOPT_MAXREDIRS => 2,
+			CURLOPT_POST => 1,
+			CURLOPT_POSTFIELDS => $input,
+			CURLOPT_SSL_VERIFYHOST => 0,
+			CURLOPT_SSL_VERIFYPEER => 0,
+			CURLOPT_VERBOSE => 1
+		);
+
+		$ch = curl_init(Config::getConverterUrl() . '?target_format=' . $targetExtension);
+		curl_setopt_array($ch, $options);
+		$content = curl_exec($ch);
+		if (curl_errno($ch)){
+			\OCP\Util::writeLog('Documents', 'cURL error' . curl_errno($ch) . ':' . curl_error($ch), \OCP\Util::DEBUG);
+		}
+		curl_close($ch);
+		
+		return $content;
+	}
+
+}
diff --git a/lib/filter/office.php b/lib/filter/office.php
new file mode 100644
index 00000000..f04456af
--- /dev/null
+++ b/lib/filter/office.php
@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * ownCloud - Documents App
+ *
+ * @author Victor Dubiniuk
+ * @copyright 2014 Victor Dubiniuk victor.dubiniuk@gmail.com
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ */
+
+namespace OCA\Documents;
+
+class Filter_Office {
+	const NATIVE_MIMETYPE = 'application/vnd.oasis.opendocument.text';
+	
+	private static $readSpec;
+	private static $writeSpec;
+	
+	/* sample mimespec 	
+			array (
+				'read' => 
+					array (
+						'target' => 'application/vnd.oasis.opendocument.text',
+						'format' => 'odt:writer8',
+						'extension' => 'odt'
+					),
+				'write' => 
+					array (
+						'target' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+						'format' => 'docx',
+						'extension' => 'docx'
+					)
+			);
+
+			array(
+				'read' => 
+					array (
+						'target' => 'application/vnd.oasis.opendocument.text',
+						'format' => 'odt:writer8',
+						'extension' => 'odt'
+					),
+				'write' => 
+					array (
+						'target' => 'application/msword',
+						'format' => 'doc',
+						'extension' => 'doc'
+					)
+			);
+
+		 */
+	
+	public function __construct($mimeSpec){
+		$this->readSpec = $mimeSpec['read'];
+		$this->writeSpec = $mimeSpec['write'];
+		
+		Filter::add($mimeSpec['write']['target'], $this);
+	}
+
+	public function read($data){
+		return array(
+			'mimetype' => $this->readSpec['target'],
+			'content' => 
+				Converter::convert(
+						$data['content'], 
+						$this->readSpec['format'],
+						$this->readSpec['extension']
+				)
+		);
+	}
+	
+	public function write($data){
+		return array(
+			'mimetype' => $this->writeSpec['target'],
+			'content' => 
+				Converter::convert(
+						$data['content'], 
+						$this->writeSpec['format'],
+						$this->writeSpec['extension']
+				)
+		);
+	}
+
+}
diff --git a/lib/helper.php b/lib/helper.php
index 2bd9cd6e..460a7f0a 100644
--- a/lib/helper.php
+++ b/lib/helper.php
@@ -140,5 +140,30 @@ class Helper {
 		$dB = str_pad(dechex(round($dB)), 2, "0", STR_PAD_LEFT);
 		return $dR.$dG.$dB;
 	}
+	
+	public static function findOpenOffice(){
+		$cmd = '';
+		if (is_string(\OC_Config::getValue('preview_libreoffice_path', null))){
+			$cmd = \OC_Config::getValue('preview_libreoffice_path', null);
+		}
+
+		$whichLibreOffice = shell_exec('which libreoffice');
+		if ($cmd === '' && !empty($whichLibreOffice)){
+			$cmd = 'libreoffice';
+		}
+
+		$whichOpenOffice = shell_exec('which openoffice');
+		if ($cmd === '' && !empty($whichOpenOffice)){
+			$cmd = 'openoffice';
+		}
+		
+		if (empty($cmd)){
+			\OCP\Util::writeLog('Documents', 'Pure configuration issue. Missing open office binary that is mandatory for conversion.', \OCP\Util::WARN);
+			\OCP\Util::writeLog('Documents', 'If openoffice or libreoffice is already installed please specify the path to it using preview_libreoffice_path config. Refer to admin manual for details.', \OCP\Util::WARN);
+			throw new \RuntimeException('Missing open office binary that is mandatory for conversion.');
+		}
+		
+		return $cmd;
+	}
 
 }