file.class.php

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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * file upload functions
 *
 * @version $Id: File.class.php 11536 2008-09-02 17:35:48Z nijel $
 */

/**
 *
 * @todo replace error messages with localized string
 * @todo when uploading a file into a blob field, should we also consider using
 *       chunks like in import? UPDATE `table` SET `field` = `field` + [chunk]
 */

class PMA_File
{
    /**
     * @var string the temporary file name
     * @access protected
     */
    var $_name = null;

    /**
     * @var string the content
     * @access protected
     */
    var $_content = null;

    /**
     * @var string the error message
     * @access protected
     */
    var $_error_message = '';

    /**
     * @var bool whether the file is temporary or not
     * @access protected
     */
    var $_is_temp = false;

    /**
     * @var string type of compression
     * @access protected
     */
    var $_compression = null;

    /**
     * @var integer
     */
    var $_offset = 0;

    /**
     * @var integer size of chunk to read with every step
     */
    var $_chunk_size = 32768;

    /**
     * @var resource file handle
     */
    var $_handle = null;

    /**
     * @var boolean whether to decompress content before returning
     */
    var $_decompress = false;

    /**
     * @var string charset of file
     */
    var $_charset = null;

    /**
     * @staticvar string most recent BLOB repository reference
    */
    static $_recent_bs_reference = NULL;

    /**
     * constructor
     *
     * @access  public
     * @uses    PMA_File::setName()
     * @param   string  $name   file name
     */
    function __construct($name = false)
    {
        if ($name) {
            $this->setName($name);
        }
    }

    /**
     * destructor
     *
     * @see     PMA_File::cleanUp()
     * @access  public
     * @uses    PMA_File::cleanUp()
     */
    function __destruct()
    {
        $this->cleanUp();
    }

    /**
     * deletes file if it is temporary, usally from a moved upload file
     *
     * @access  public
     * @uses    PMA_File::delet()
     * @uses    PMA_File::isTemp()
     * @return  boolean success
     */
    function cleanUp()
    {
        if ($this->isTemp()) {
            return $this->delete();
        }

        return true;
    }

    /**
     * deletes the file
     *
     * @access  public
     * @uses    PMA_File::getName()
     * @uses    unlink()
     * @return  boolean success
     */
    function delete()
    {
        return unlink($this->getName());
    }

    /**
     * checks or sets the temp flag for this file
     * file objects with temp flags are deleted with object destruction
     *
     * @access  public
     * @uses    PMA_File::$_is_temp to set and read it
     * @param   boolean sets the temp flag
     * @return  boolean PMA_File::$_is_temp
     */
    function isTemp($is_temp = null)
    {
        if (null !== $is_temp) {
            $this->_is_temp = (bool) $is_temp;
        }

        return $this->_is_temp;
    }

    /**
     * accessor
     *
     * @access  public
     * @uses    PMA_File::$_name
     * @param   string  $name   file name
     * @access  public
     */
    function setName($name)
    {
        $this->_name = trim($name);
    }

    /**
     * @access  public
     * @uses    PMA_File::getName()
     * @uses    PMA_File::isUploaded()
     * @uses    PMA_File::checkUploadedFile()
     * @uses    PMA_File::isReadable()
     * @uses    PMA_File::$_content
     * @uses    function_exists()
     * @uses    file_get_contents()
     * @uses    filesize()
     * @uses    fread()
     * @uses    fopen()
     * @uses    bin2hex()
     * @return  string  binary file content
     */
    function getContent($as_binary = true, $offset = 0, $length = null)
    {
        if (null === $this->_content) {
            if ($this->isUploaded() && ! $this->checkUploadedFile()) {
                return false;
            }

            if (! $this->isReadable()) {
                return false;
            }

            if (function_exists('file_get_contents')) {
                $this->_content = file_get_contents($this->getName());
            } elseif ($size = filesize($this->getName())) {
                $this->_content = fread(fopen($this->getName(), 'rb'), $size);
            }
        }

        if (! empty($this->_content) && $as_binary) {
            return '0x' . bin2hex($this->_content);
        }

        if (null !== $length) {
            return substr($this->_content, $offset, $length);
        } elseif ($offset > 0) {
            return substr($this->_content, $offset);
        }

        return $this->_content;
    }

    /**
     * @access  public
     * @uses    PMA_File::getName()
     * @uses    is_uploaded_file()
     */
    function isUploaded()
    {
        return is_uploaded_file($this->getName());
    }

    /**
     * accessor
     *
     * @access  public
     * @uses    PMA_File::$name as return value
     * @return  string  PMA_File::$_name
     */
    function getName()
    {
        return $this->_name;
    }

    /**
     * @todo replace error message with localized string
     * @access  public
     * @uses    PMA_File::isUploaded()
     * @uses    PMA_File::setName()
     * @uses    PMA_File::$_error_message
     * @param   string  name of file uploaded
     * @return  boolean success
     */
    function setUploadedFile($name)
    {
        $this->setName($name);

        if (! $this->isUploaded()) {
            $this->setName(null);
            $this->_error_message = 'not an uploaded file';
            return false;
        }

        return true;
    }

    /**
     * @access  public
     * @uses    PMA_File::fetchUploadedFromTblChangeRequestMultiple()
     * @uses    PMA_File::setUploadedFile()
     * @uses    PMA_File::setRecentBLOBReference()
     * @uses    curl_setopt_array()
     * @uses    PMA_File::$_error_message
     * @uses    $GLOBALS['strUploadErrorIniSize']
     * @uses    $GLOBALS['strUploadErrorFormSize']
     * @uses    $GLOBALS['strUploadErrorPartial']
     * @uses    $GLOBALS['strUploadErrorNoTempDir']
     * @uses    $GLOBALS['strUploadErrorCantWrite']
     * @uses    $GLOBALS['strUploadErrorExtension']
     * @uses    $GLOBALS['strUploadErrorUnknown']
     * @uses    $_FILES
     * @param   string  $key    a numeric key used to identify the different rows
     * @param   string  $primary_key
     * @return  boolean success
     */
    function setUploadedFromTblChangeRequest($key, $primary = null)
    {
        if (! isset($_FILES['fields_upload_' . $key])) {
            return false;
        }

        $file = $_FILES['fields_upload_' . $key];

        if (null !== $primary) {
            $file = PMA_File::fetchUploadedFromTblChangeRequestMultiple($file, $primary);
        }

        // rajk - for blobstreaming
        $is_bs_upload = FALSE;

        // check if this field requires a repository upload
        if (isset($_REQUEST['upload_blob_repo_' . $key]))
            $is_bs_upload = ($_REQUEST['upload_blob_repo_' . $key]['multi_edit'][0] == "on") ? TRUE : FALSE;

        // if request is an upload to the BLOB repository
        if ($is_bs_upload)
        {
            // load PMA configuration
            $PMA_Config = $_SESSION['PMA_Config'];

            // if PMA configuration is loaded
            if (!empty($PMA_Config))
            {
                // load BS variables from PMA configuration
                $pluginsExist  = $PMA_Config->get('BLOBSTREAMING_PLUGINS_EXIST');
                $curlExists = $PMA_Config->get('CURL_EXISTS');
                $bs_database = $PMA_Config->get('BLOBSTREAMABLE_DATABASES');
                $bs_database = $bs_database[$_REQUEST['db']];

                $allBSTablesExist = TRUE;

                // determine if plugins and curl exist
                if ($pluginsExist && $curlExists)
                {
                    foreach ($bs_database as $table_key=>$table)
                    {
                        if (!$bs_database[$table_key]['Exists'])
                        {
                            $allBSTablesExist = FALSE;
                            break;
                        }
                    }
                }
                else
                    $allBSTablesExist = FALSE;

                // if necessary BS tables exist
                if ($allBSTablesExist)
                {
                    // setup bs variables for uploading
                    $bs_server = $PMA_Config->get('BLOBSTREAMING_SERVER');
                    $bs_db = $_REQUEST['db'];
                    $bs_table = $_REQUEST['table'];

                    // setup file handle and related variables
                    $tmp_file = fopen($file['tmp_name'], 'r');
                    $tmp_file_type = $file['type'];
                    $tmp_file_size = $file['size'];

                    if (!$tmp_file_type)
                        $tmp_file_type = NULL;

                    // if none of the required variables contain data, return with an unknown error message
                    if (!$bs_server || !$bs_db || !$bs_table || !$tmp_file || !$tmp_file_size)
                    {
                        $this->_error_message = $GLOBALS['strUploadErrorUnknown'];
                        return FALSE;
                    }
                    else
                        $bs_server_path = 'http://' . $bs_server . '/' . $bs_db . '/' . $bs_table;

                    // init curl handle
                    $curlHnd = curl_init ($bs_server_path);

                    // if curl handle init successful
                    if ($curlHnd)
                    {
                        // specify custom header
                        $customHeader = array(
                            "Accept-Language: en-us;en;q=0;5",
                            "Accept-Charset: ISO-8859-1;utf-8;q=0.7,*;q=0.7",
                            "Content-type: $tmp_file_type"
                        );

                        // specify CURL options in array
                        $curlOptArr = array(
                            CURLOPT_PUT => TRUE,
                            CURLOPT_HEADER => TRUE,
                            CURLOPT_HTTPHEADER => $customHeader,
                            CURLOPT_INFILESIZE => $tmp_file_size,
                            CURLOPT_INFILE => $tmp_file,
                            CURLOPT_RETURNTRANSFER => TRUE
                        );

                        // pass array of options to curl handle setup function
                        curl_setopt_array($curlHnd, $curlOptArr);

                        // execute curl request and retrieve error message(s) (if any)
                        $ret = curl_exec($curlHnd);
                        $errRet = curl_error($curlHnd);

                        // close curl handle
                        curl_close($curlHnd);

                        // split entire string into array of lines
                        $retArr = explode("\r\n", $ret);

                        // check each line as a valid string of a BLOB reference
                        foreach ($retArr as $value)
                            if (strlen($value) > strlen("~*$bs_db/~") && "~*$bs_db/~" == substr($value, 0, strlen($bs_db) + 4))
                            {
                                // is a valid reference, so set as current and break
                                PMA_File::setRecentBLOBReference($value);
                                break;
                            }

                        // close file handle
                        if ($tmp_file)
                            fclose($tmp_file);
                    }   // end if ($curlHnd)
                }   // end if ($allBSTablesExist)
            }   // end if ($PMA_Config)
        }   // end if ($is_bs_upload)

        // check for file upload errors
        switch ($file['error']) {
            // cybot_tm: we do not use the PHP constants here cause not all constants
            // are defined in all versions of PHP - but the correct constants names
            // are given as comment
            case 0: //UPLOAD_ERR_OK:
                return $this->setUploadedFile($file['tmp_name']);
                break;
            case 4: //UPLOAD_ERR_NO_FILE:
                break;
            case 1: //UPLOAD_ERR_INI_SIZE:
                $this->_error_message = $GLOBALS['strUploadErrorIniSize'];
                break;
            case 2: //UPLOAD_ERR_FORM_SIZE:
                $this->_error_message = $GLOBALS['strUploadErrorFormSize'];
                break;
            case 3: //UPLOAD_ERR_PARTIAL: