Add endpoint for public editor previews

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

appinfo/routes.php

@@ -31,6 +31,11 @@
 			'name' => 'FileHandling#save',
 			'url' => '/ajax/savefile',
 			'verb' => 'PUT'
+		],
+		[
+			'name' => 'PublicFileHandling#load',
+			'url' => '/public/{token}',
+			'verb' => 'GET'
 		]
 	]
 ];

lib/Controller/PublicFileHandlingController.php

@@ -0,0 +1,126 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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/>.
+ *
+ */
+namespace OCA\FilesTextEditor\Controller;
+
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\Files\Folder;
+use OCP\Files\NotFoundException;
+use OCP\IL10N;
+use OCP\IRequest;
+use OCP\ISession;
+use OCP\Share\Exceptions\ShareNotFound;
+use OCP\Share\IManager as ShareManager;
+
+class PublicFileHandlingController extends Controller{
+
+	/** @var IL10N */
+	private $l;
+
+	/** @var ShareManager */
+	private $shareManager;
+
+	/** @var ISession */
+	private $session;
+
+	/**
+	 *
+	 * @param string $AppName
+	 * @param IRequest $request
+	 * @param IL10N $l10n
+	 * @param ShareManager $shareManager
+	 * @param ISession $session
+	 */
+	public function __construct($AppName,
+								IRequest $request,
+								IL10N $l10n,
+								ShareManager $shareManager,
+								ISession $session) {
+		parent::__construct($AppName, $request);
+		$this->l = $l10n;
+		$this->shareManager = $shareManager;
+		$this->session = $session;
+	}
+
+	/**
+	 * load text file
+	 *
+	 * @NoAdminRequired
+	 * @PublicPage
+	 * @NoCSRFRequired
+	 *
+	 * @param string $token
+	 * @return DataResponse
+	 */
+	public function load($token) {
+		try {
+			$share = $this->shareManager->getShareByToken($token);
+		} catch (ShareNotFound $e) {
+			return new DataResponse(['message' => $this->l->t('Share not found'), Http::STATUS_NOT_FOUND]);
+		}
+
+		if ($share->getPassword() !== null &&
+			(!$this->session->exists('public_link_authenticated')
+			|| $this->session->get('public_link_authenticated') !== (string)$share->getId())) {
+			return new DataResponse(['message' => $this->l->t('You are not authorized to open this share'), Http::STATUS_BAD_REQUEST]);
+		}
+
+		try {
+			$node = $share->getNode();
+		} catch (NotFoundException $e) {
+			return new DataResponse(['message' => $this->l->t('Share not found'), Http::STATUS_NOT_FOUND]);
+		}
+
+		if ($node instanceof Folder) {
+			return new DataResponse(['message' => $this->l->t('You can not open a folder')], Http::STATUS_BAD_REQUEST);
+		}
+
+		// default of 4MB
+		$maxSize = 4194304;
+		if ($node->getSize() > $maxSize) {
+			return new DataResponse(['message' => $this->l->t('This file is too big to be opened. Please download the file instead.')], Http::STATUS_BAD_REQUEST);
+		}
+
+		$fileContents = $node->getContent();
+		if ($fileContents !== false) {
+			$encoding = mb_detect_encoding($fileContents . 'a', 'UTF-8, WINDOWS-1252, ISO-8859-15, ISO-8859-1, ASCII', true);
+			if ($encoding === '') {
+				// set default encoding if it couldn't be detected
+				$encoding = 'ISO-8859-15';
+			}
+			$fileContents = iconv($encoding, 'UTF-8', $fileContents);
+			return new DataResponse(
+				[
+					'filecontents' => $fileContents,
+					'writeable' => false,
+					'mime' => $node->getMimeType(),
+					'mtime' => $node->getMTime(),
+				],
+				Http::STATUS_OK
+			);
+		}
+
+		return new DataResponse(['message' => $this->l->t('Cannot read the file.')], Http::STATUS_BAD_REQUEST);
+	}
+}