<?php

namespace RedMatrix\RedDAV;

use Sabre\DAV;

/**
 * @brief This class represents a file in DAV.
 *
 * It provides all functions to work with files in Red's cloud through DAV protocol.
 *
 * @extends \Sabre\DAV\Node
 * @implements \Sabre\DAV\IFile
 *
 * @link http://github.com/friendica/red
 * @license http://opensource.org/licenses/mit-license.php The MIT License (MIT)
 */
class RedFile extends DAV\Node implements DAV\IFile {

	/**
	 * The file from attach table.
	 *
	 * @var array
	 *  data
	 *  flags
	 *  filename (string)
	 *  filetype (string)
	 */
	private $data;
	/**
	 * @see \Sabre\DAV\Auth\Backend\BackendInterface
	 * @var \RedMatrix\RedDAV\RedBasicAuth
	 */
	private $auth;
	/**
	 * @var string
	 */
	private $name;

	/**
	 * Sets up the node, expects a full path name.
	 *
	 * @param string $name
	 * @param array $data from attach table
	 * @param &$auth
	 */
	public function __construct($name, $data, &$auth) {
		$this->name = $name;
		$this->data = $data;
		$this->auth = $auth;

		logger('RedFile::__construct(): ' . print_r($this->data, true), LOGGER_DATA);
	}

	/**
	 * @brief Returns the name of the file.
	 *
	 * @return string
	 */
	public function getName() {
		logger('RedFile::getName(): ' . basename($this->name), LOGGER_DEBUG);
		return basename($this->name);
	}

	/**
	 * @brief Renames the file.
	 *
	 * @throw Sabre\DAV\Exception\Forbidden
	 * @param string $name The new name of the file.
	 * @return void
	 */
	public function setName($newName) {
		logger('RedFile::setName(): ' . basename($this->name) . ' -> ' . $newName, LOGGER_DEBUG);

		if ((! $newName) || (! $this->auth->owner_id) || (! perm_is_allowed($this->auth->owner_id, $this->auth->observer, 'write_storage'))) {
			throw new DAV\Exception\Forbidden('Permission denied.');
		}

		$newName = str_replace('/', '%2F', $newName);

		$r = q("UPDATE attach SET filename = '%s' WHERE hash = '%s' AND id = %d LIMIT 1",
			dbesc($this->data['filename']),
			intval($this->data['id'])
		);
	}

	/**
	 * @brief Updates the data of the file.
	 *
	 * @param resource $data
	 * @return void
	 */
	public function put($data) {
		logger('RedFile::put(): ' . basename($this->name), LOGGER_DEBUG);
		$size = 0;

		// @todo only 3 values are needed
		$c = q("SELECT * FROM channel WHERE channel_id = %d AND NOT (channel_pageflags & %d) LIMIT 1",
			intval($this->auth->owner_id),
			intval(PAGE_REMOVED)
		);

		$r = q("SELECT flags, folder, data FROM attach WHERE hash = '%s' AND uid = %d LIMIT 1",
			dbesc($this->data['hash']),
			intval($c[0]['channel_id'])
		);
		if ($r) {
			if ($r[0]['flags'] & ATTACH_FLAG_OS) {
				$f = 'store/' . $this->auth->owner_nick . '/' . (($r[0]['data']) ? $r[0]['data'] : '');
				// @todo check return value and set $size directly
				@file_put_contents($f, $data);
				$size = @filesize($f);
				logger('RedFile::put(): filename: ' . $f . ' size: ' . $size, LOGGER_DEBUG);
			} else {
				$r = q("UPDATE attach SET data = '%s' WHERE hash = '%s' AND uid = %d LIMIT 1",
					dbesc(stream_get_contents($data)),
					dbesc($this->data['hash']),
					intval($this->data['uid'])
				);
				$r = q("SELECT length(data) AS fsize FROM attach WHERE hash = '%s' AND uid = %d LIMIT 1",
					dbesc($this->data['hash']),
					intval($this->data['uid'])
				);
				if ($r) {
					$size = $r[0]['fsize'];
				}
			}
		}

		// returns now()
		$edited = datetime_convert();

		$d = q("UPDATE attach SET filesize = '%s', edited = '%s' WHERE hash = '%s' AND uid = %d LIMIT 1",
			dbesc($size),
			dbesc($edited),
			dbesc($this->data['hash']),
			intval($c[0]['channel_id'])
		);

		// update the folder's lastmodified timestamp
		$e = q("UPDATE attach SET edited = '%s' WHERE hash = '%s' AND uid = %d LIMIT 1",
			dbesc($edited),
			dbesc($r[0]['folder']),
			intval($c[0]['channel_id'])
		);

		// @todo do we really want to remove the whole file if an update fails
		// because of maxfilesize or quota?
		// There is an Exception "InsufficientStorage" or "PaymentRequired" for
		// our service class from SabreDAV we could use.

		$maxfilesize = get_config('system', 'maxfilesize');
		if (($maxfilesize) && ($size > $maxfilesize)) {
			attach_delete($c[0]['channel_id'], $this->data['hash']);
			return;
		}

		$limit = service_class_fetch($c[0]['channel_id'], 'attach_upload_limit');
		if ($limit !== false) {
			$x = q("select sum(filesize) as total from attach where aid = %d ",
				intval($c[0]['channel_account_id'])
			);
			if (($x) && ($x[0]['total'] + $size > $limit)) {
				logger('RedFile::put(): service class limit exceeded for ' . $c[0]['channel_name'] . ' total usage is ' . $x[0]['total'] . ' limit is ' . $limit);
				attach_delete($c[0]['channel_id'], $this->data['hash']);
				return;
			}
		}
	}

	/**
	 * @brief Returns the raw data.
	 *
	 * @return string
	 */
	public function get() {
		logger('RedFile::get(): ' . basename($this->name), LOGGER_DEBUG);

		$r = q("SELECT data, flags, filename, filetype FROM attach WHERE hash = '%s' AND uid = %d LIMIT 1",
			dbesc($this->data['hash']),
			intval($this->data['uid'])
		);
		if ($r) {
			// @todo this should be a global definition
			$unsafe_types = array('text/html', 'text/css', 'application/javascript');

			if (in_array($r[0]['filetype'], $unsafe_types)) {
				header('Content-disposition: attachment; filename="' . $r[0]['filename'] . '"');
				header('Content-type: text/plain');
			}

			if ($r[0]['flags'] & ATTACH_FLAG_OS ) {
				$f = 'store/' . $this->auth->owner_nick . '/' . (($this->os_path) ? $this->os_path . '/' : '') . $r[0]['data'];
				return fopen($f, 'rb');
			}
			return $r[0]['data'];
		}
	}

	/**
	 * @brief 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 arbitrary string, but MUST be surrounded by double-quotes.
	 *
	 * Return null if the ETag can not effectively be determined.
	 *
	 * @return mixed
	 */
	public function getETag() {
		$ret = null;
		if ($this->data['hash']) {
			$ret = '"' . $this->data['hash'] . '"';
		}
		return $ret;
	}

	/**
	 * @brief Returns the mime-type for a file.
	 *
	 * If null is returned, we'll assume application/octet-stream
	 *
	 * @return mixed
	 */
	public function getContentType() {
		// @todo this should be a global definition.
		$unsafe_types = array('text/html', 'text/css', 'application/javascript');
		if (in_array($this->data['filetype'], $unsafe_types)) {
			return 'text/plain';
		}
		return $this->data['filetype'];
	}

	/**
	 * @brief Returns the size of the node, in bytes.
	 *
	 * @return int
	 */
	public function getSize() {
		return $this->data['filesize'];
	}

	/**
	 * @brief Returns the last modification time for the file, as a unix
	 *        timestamp.
	 *
	 * @return int last modification time in UNIX timestamp
	 */
	public function getLastModified() {
		return datetime_convert('UTC', 'UTC', $this->data['edited'], 'U');
	}

	/**
	 * @brief Delete the file.
	 *
	 * @throw Sabre\DAV\Exception\Forbidden
	 * @return void
	 */
	public function delete() {
		logger('RedFile::delete(): ' . basename($this->name), LOGGER_DEBUG);

		if ((! $this->auth->owner_id) || (! perm_is_allowed($this->auth->owner_id, $this->auth->observer, 'write_storage'))) {
			throw new DAV\Exception\Forbidden('Permission denied.');
		}

		if ($this->auth->owner_id !== $this->auth->channel_id) {
			if (($this->auth->observer !== $this->data['creator']) || ($this->data['flags'] & ATTACH_FLAG_DIR)) {
				throw new DAV\Exception\Forbidden('Permission denied.');
			}
		}

		attach_delete($this->auth->owner_id, $this->data['hash']);
	}
}