<?php

/**
 * ownCloud
 *
 * @author Jakob Sack
 * @copyright 2011 Jakob Sack kde@jakobsack.de
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_DAV_IFile {

	/**
	 * Updates the data
	 *
	 * The data argument is a readable stream resource.
	 *
	 * After a succesful put operation, you may choose to return an ETag. The
	 * etag must always be surrounded by double-quotes. These quotes must
	 * appear in the actual string you're returning.
	 *
	 * Clients may use the ETag from a PUT request to later on make sure that
	 * when they update the file, the contents haven't changed in the mean
	 * time.
	 *
	 * If you don't plan to store the file byte-by-byte, and you return a
	 * different object on a subsequent GET you are strongly recommended to not
	 * return an ETag, and just return null.
	 *
	 * @param resource $data
	 * @throws Sabre_DAV_Exception_Forbidden
	 * @return string|null
	 */
	public function put($data) {

		if (!\OC\Files\Filesystem::isUpdatable($this->path)) {
			throw new \Sabre_DAV_Exception_Forbidden();
		}

		// throw an exception if encryption was disabled but the files are still encrypted
		if (\OC_Util::encryptedFiles()) {
			throw new \Sabre_DAV_Exception_ServiceUnavailable();
		}
		
		// mark file as partial while uploading (ignored by the scanner)
		$partpath = $this->path . '.part';

		\OC\Files\Filesystem::file_put_contents($partpath, $data);

		//detect aborted upload
		if (isset ($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PUT') {
			if (isset($_SERVER['CONTENT_LENGTH'])) {
				$expected = $_SERVER['CONTENT_LENGTH'];
				$actual = \OC\Files\Filesystem::filesize($partpath);
				if ($actual != $expected) {
					\OC\Files\Filesystem::unlink($partpath);
					throw new Sabre_DAV_Exception_BadRequest(
						'expected filesize ' . $expected . ' got ' . $actual);
				}
			}
		}

		// rename to correct path
		\OC\Files\Filesystem::rename($partpath, $this->path);

		//allow sync clients to send the mtime along in a header
		$mtime = OC_Request::hasModificationTime();
		if ($mtime !== false) {
			if (\OC\Files\Filesystem::touch($this->path, $mtime)) {
				header('X-OC-MTime: accepted');
			}
		}

		return OC_Connector_Sabre_Node::getETagPropertyForPath($this->path);
	}

	/**
	 * Returns the data
	 *
	 * @return string
	 */
	public function get() {

		//throw execption if encryption is disabled but files are still encrypted
		if (\OC_Util::encryptedFiles()) {
			throw new \Sabre_DAV_Exception_ServiceUnavailable();
		} else {
			return \OC\Files\Filesystem::fopen($this->path, 'rb');
		}

	}

	/**
	 * Delete the current file
	 *
	 * @return void
	 * @throws Sabre_DAV_Exception_Forbidden
	 */
	public function delete() {

		if (!\OC\Files\Filesystem::isDeletable($this->path)) {
			throw new \Sabre_DAV_Exception_Forbidden();
		}
		\OC\Files\Filesystem::unlink($this->path);

	}

	/**
	 * Returns the size of the node, in bytes
	 *
	 * @return int
	 */
	public function getSize() {
		$this->getFileinfoCache();
		if ($this->fileinfo_cache['size'] > -1) {
			return $this->fileinfo_cache['size'];
		} else {
			return null;
		}
	}

	/**
	 * Returns the ETag for a file
	 *
	 * An ETag is a unique identifier representing the current version of the
	 * file. If the file changes, the ETag MUST change.  The ETag is an
	 * arbritrary string, but MUST be surrounded by double-quotes.
	 *
	 * Return null if the ETag can not effectively be determined
	 *
	 * @return mixed
	 */
	public function getETag() {
		$properties = $this->getProperties(array(self::GETETAG_PROPERTYNAME));
		if (isset($properties[self::GETETAG_PROPERTYNAME])) {
			return $properties[self::GETETAG_PROPERTYNAME];
		}
		return null;
	}

	/**
	 * Returns the mime-type for a file
	 *
	 * If null is returned, we'll assume application/octet-stream
	 *
	 * @return mixed
	 */
	public function getContentType() {
		if (isset($this->fileinfo_cache['mimetype'])) {
			return $this->fileinfo_cache['mimetype'];
		}

		return \OC\Files\Filesystem::getMimeType($this->path);

	}
}