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Dir : ~/usr/share/psa-horde/imp/lib/Compose/Attachment/

Edit File: Storage.php

<?php
/**
 * Copyright 2013-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (GPL). If you
 * did not receive this file, see http://www.horde.org/licenses/gpl.
 *
 * @category  Horde
 * @copyright 2013-2017 Horde LLC
 * @license   http://www.horde.org/licenses/gpl GPL
 * @package   IMP
 */

/**
 * Abstract base class for attachment data storage.
 *
 * @author    Michael Slusarz <slusarz@horde.org>
 * @category  Horde
 * @copyright 2013-2017 Horde LLC
 * @license   http://www.horde.org/licenses/gpl GPL
 * @package   IMP
 *
 * @property-read boolean $linked  Can this attachment be linked?
 * @property-read Horde_Url $link_url  The URL, if the attachment is linked.
 */
abstract class IMP_Compose_Attachment_Storage
{
    /**
     * Attachment identifier.
     *
     * @var string
     */
    protected $_id;

/**
     * Temporary file location.
     *
     * @var string
     */
    protected $_tmpfile;

/**
     * Attachment owner.
     *
     * @var string
     */
    protected $_user;

/**
     * Constructor.
     *
     * @param string $user  Attachment owner.
     * @param string $id    Attachment identifier.
     */
    public function __construct($user, $id = null)
    {
        $this->_user = $user;
        $this->_id = $id;
    }

/**
     */
    public function __get($name)
    {
        switch ($name) {
        case 'linked':
            return ($this instanceof IMP_Compose_Attachment_Linked);

case 'link_url':
            return $this->linked
                ? Horde::url(
                    'attachment.php',
                    true,
                    array('append_session' => -1)
                  )->add(array(
                      'id' => $this->_id,
                      'u' => $this->_user
                  ))
                : null;
        }
    }

/**
     * Read attachment data from storage.
     *
     * @return Horde_Stream  Stream object containing data.
     * @throws IMP_Compose_Exception
     */
    public function read()
    {
        return (isset($this->_tmpfile) && is_readable($this->_tmpfile))
            ? new Horde_Stream_Existing(array('stream' => fopen($this->_tmpfile, 'r')))
            : $this->_read();
    }

/**
     * @see read()
     */
    abstract protected function _read();

/**
     * Write attachment to storage.
     *
     * @param string $filename       Filename containing attachment data.
     * @param Horde_Mime_Part $part  Mime part object containing attachment
     *                               metadata.
     *
     * @throws IMP_Compose_Exception
     */
    public function write($filename, Horde_Mime_Part $part)
    {
        $this->_tmpfile = $filename;
        $this->_write($filename, $part);
    }

/**
     * @see write()
     */
    abstract protected function _write($filename, Horde_Mime_Part $part);

/**
     * Writes attachment data to a temporary file.
     *
     * @return string  Temporary file path.
     *
     * @throws IMP_Compose_Exception
     */
    public function getTempFile()
    {
        if (isset($this->_tmpfile)) {
            return $this->_tmpfile;
        }

$stream = $this->read();

$tmp = Horde::getTempFile('impatt');
        $fd = fopen($tmp, 'w+');

while (!$stream->eof()) {
            fwrite($fd, $stream->substring(0, 8192));
        }
        fclose($fd);
        $stream->close();

return $tmp;
    }

/**
     * Delete data from storage.
     */
    abstract public function delete();

/**
     * Does the attachment exist in the storage backend?
     *
     * @return boolean  True if the file exists.
     */
    abstract public function exists();

/**
     * Garbage collection.
     */
    public function gc()
    {
    }

}