WOPI Token table and database plumbing added

appinfo/database.xml

@@ -274,4 +274,53 @@
 		</declaration>
 	</table>
 	
+	<table>
+		<name>*dbprefix*richdocuments_wopi</name>
+		<declaration>
+			<field>
+				<name>id</name>
+				<type>integer</type>
+				<notnull>true</notnull>
+				<autoincrement>1</autoincrement>
+				<unsigned>true</unsigned>
+				<length>4</length>
+				<comments>Unique per token</comments>
+			</field>
+			<field>
+				<name>uid</name>
+				<type>text</type>
+				<length>64</length>
+				<comments>UserId - a textual user identifier (unique?)</comments>
+			</field>
+			<field>
+				<name>fileid</name>
+				<type>integer</type>
+				<notnull>true</notnull>
+				<length>4</length>
+				<comments>The unique ID of the file authorized</comments>
+			</field>
+			<field>
+				<name>path</name>
+				<type>text</type>
+				<notnull>true</notnull>
+				<length>512</length>
+				<comments>Relative to storage e.g. /welcome.odt</comments>
+			</field>
+			<field>
+				<name>token</name>
+				<type>text</type>
+				<default></default>
+				<notnull>true</notnull>
+				<length>32</length>
+				<comments>File access token</comments>
+			</field>
+			<field>
+				<name>expiry</name>
+				<type>integer</type>
+				<unsigned>true</unsigned>
+				<length>4</length>
+				<comments>Expiration time of the token</comments>
+			</field>
+		</declaration>
+	</table>
 </database>

appinfo/info.xml

@@ -4,7 +4,7 @@
 	<name>Collabora Online Development Edition</name>
 	<description>An ownCloud app to work with office documents</description>
 	<licence>AGPL</licence>
-	<version>0.12.0</version>
+	<version>0.13.0</version>
 	<author>Collabora Productivity based on work of Frank Karlitschek, Victor Dubiniuk</author>
 	<bugs>https://www.collaboraoffice.com/</bugs>
 	<repository type="git">git://gerrit.libreoffice.org/online.git</repository>

lib/db/wopi.php

@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * ownCloud - Richdocuments App
+ *
+ * @author Ashod Nakashian
+ * @copyright 2016 Ashod Nakashian ashod.nakashian@collabora.co.uk
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ */
+
+namespace OCA\Richdocuments\Db;
+
+use \OCA\Richdocuments\Download;
+use \OCA\Richdocuments\DownloadResponse;
+
+/**
+ * @method string generateFileToken()
+ * @method string getPathForToken()
+ */
+
+class Wopi extends \OCA\Richdocuments\Db{
+
+	const DB_TABLE = '`*PREFIX*richdocuments_wopi`';
+
+	// Tokens expire after this many seconds (not defined by WOPI specs).
+	const TOKEN_LIFETIME_SECONDS = 30 * 60;
+
+	protected $tableName  = '`*PREFIX*richdocuments_wopi`';
+
+	protected $insertStatement  = 'INSERT INTO `*PREFIX*richdocuments_wopi` (`uid`, `fileid`, `path`, `token`, `expiry`)
+			VALUES (?, ?, ?, ?, ?)';
+
+	protected $loadStatement = 'SELECT * FROM `*PREFIX*richdocuments_wopi` WHERE `token`= ?';
+
+	/*
+	 * Given a fileId, generates a token
+	 * and stores in the database.
+	 * Returns the token.
+	 */
+	public function generateFileToken($fileId){
+		$user = \OC_User::getUser();
+		$view = new \OC\Files\View('/' . $user . '/');
+		$path = $view->getPath($fileId);
+
+		if (!$view->is_file($path)) {
+			throw new \Exception('Invalid fileId.');
+		}
+
+		$token = \OC::$server->getSecureRandom()->getMediumStrengthGenerator()->generate(32,
+					\OCP\Security\ISecureRandom::CHAR_LOWER . \OCP\Security\ISecureRandom::CHAR_UPPER .
+					\OCP\Security\ISecureRandom::CHAR_DIGITS);
+
+		\OC::$server->getLogger()->debug('Issuing token for {user} file {fileId}: {token}',
+										 [ 'user' => $user, 'fileId' => $fileId, 'token' => $token ]);
+
+		$wopi = new \OCA\Richdocuments\Db\Wopi([
+			$user,
+			$fileId,
+			$path,
+			$token,
+			time() + self::TOKEN_LIFETIME_SECONDS
+		]);
+
+		if (!$wopi->insert()){
+			throw new \Exception('Failed to add wopi token into database');
+		}
+
+		return $token;
+	}
+
+	/*
+	 * Given a token, validates it and
+	 * constructs and validates the path.
+	 * Returns the path, if valid, else false.
+	 */
+	public function getPathForToken($fileId, $token){
+
+		$wopi = new Wopi();
+		$row = $wopi->loadBy('token', $token)->getData();
+		\OC::$server->getLogger()->debug('Loaded WOPI Token record: {row}.', [ 'row' => $row ]);
+
+		//TODO: validate.
+		if ($row['expiry'] > time() || $row['fileid'] !== $fileId){
+			// Expired token!
+			//$wopi->deleteBy('id', $row['id']);
+			//return false;
+		}
+
+		$user = $row['uid'];
+		$view = new \OC\Files\View('/' . $user . '/');
+		$path = $row['path'];
+
+		if (!$view->is_file($path)) {
+			throw new \Exception('Invalid file path.');
+		}
+
+		return array('user' => $user, 'path' => $path);
+	}
+}