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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* file upload functions
*
* @package PhpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* File wrapper class
*
* @todo when uploading a file into a blob field, should we also consider using
* chunks like in import? UPDATE `table` SET `field` = `field` + [chunk]
*
* @package PhpMyAdmin
*/
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;
/**
* constructor
*
* @param string $name file name
*
* @access public
*/
function __construct($name = false)
{
if ($name) {
$this->setName($name);
}
}
/**
* destructor
*
* @see PMA_File::cleanUp()
* @access public
*/
function __destruct()
{
$this->cleanUp();
}
/**
* deletes file if it is temporary, usally from a moved upload file
*
* @access public
* @return boolean success
*/
function cleanUp()
{
if ($this->isTemp()) {
return $this->delete();
}
return true;
}
/**
* deletes the file
*
* @access public
* @return boolean success
*/
function delete()
{
return unlink($this->getName());
}
/**
* checks or sets the temp flag for this file
* file objects with temp flags are deleted with object destruction
*
* @param boolean $is_temp sets the temp flag
*
* @return boolean PMA_File::$_is_temp
* @access public
*/
function isTemp($is_temp = null)
{
if (null !== $is_temp) {
$this->_is_temp = (bool) $is_temp;
}
return $this->_is_temp;
}
/**
* accessor
*
* @param string $name file name
*
* @return void
* @access public
*/
function setName($name)
{
$this->_name = trim($name);
}
/**
* Gets file content
*
* @return mixed the binary file content as a string,
* or false if no content
*
* @access public
*/
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 $this->_content;
}
/**
* Whether file is uploaded.
*
* @access public
*
* @return bool
*/
function isUploaded()
{
return is_uploaded_file($this->getName());
}
/**
* accessor
*
* @access public
* @return string PMA_File::$_name
*/
function getName()
{
return $this->_name;
}
/**
* Initializes object from uploaded file.
*
* @param string $name name of file uploaded
*
* @return boolean success
* @access public
*/
function setUploadedFile($name)
{
$this->setName($name);
if (! $this->isUploaded()) {
$this->setName(null);
$this->_error_message = __('File was not an uploaded file.');
return false;
}
return true;
}
/**
* Loads uploaded file from table change request.
*
* @param string $key the md5 hash of the column name
* @param string $rownumber
*
* @return boolean success
* @access public
*/
function setUploadedFromTblChangeRequest($key, $rownumber)
{
if (! isset($_FILES['fields_upload']) || empty($_FILES['fields_upload']['name']['multi_edit'][$rownumber][$key])) {
return false;
}
$file = PMA_File::fetchUploadedFromTblChangeRequestMultiple(
$_FILES['fields_upload'],
$rownumber,
$key
);
// check for file upload errors
switch ($file['error']) {
// 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 = __('The uploaded file exceeds the upload_max_filesize directive in php.ini.');
break;
case 2: //UPLOAD_ERR_FORM_SIZE:
$this->_error_message = __('The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.');
break;
case 3: //UPLOAD_ERR_PARTIAL:
$this->_error_message = __('The uploaded file was only partially uploaded.');
break;
case 6: //UPLOAD_ERR_NO_TMP_DIR:
$this->_error_message = __('Missing a temporary folder.');
break;
case 7: //UPLOAD_ERR_CANT_WRITE:
$this->_error_message = __('Failed to write file to disk.');
break;
case 8: //UPLOAD_ERR_EXTENSION:
$this->_error_message = __('File upload stopped by extension.');
break;
default:
$this->_error_message = __('Unknown error in file upload.');
} // end switch
return false;
}
/**
* strips some dimension from the multi-dimensional array from $_FILES
*
* <code>
* $file['name']['multi_edit'][$rownumber][$key] = [value]
* $file['type']['multi_edit'][$rownumber][$key] = [value]
* $file['size']['multi_edit'][$rownumber][$key] = [value]
* $file['tmp_name']['multi_edit'][$rownumber][$key] = [value]
* $file['error']['multi_edit'][$rownumber][$key] = [value]
*
* // becomes:
*
* $file['name'] = [value]
* $file['type'] = [value]
* $file['size'] = [value]
* $file['tmp_name'] = [value]
* $file['error'] = [value]
* </code>
*
* @param array $file the array
* @param string $rownumber
* @param string $key
*
* @return array
* @access public
* @static
*/
function fetchUploadedFromTblChangeRequestMultiple($file, $rownumber, $key)
{
$new_file = array(
'name' => $file['name']['multi_edit'][$rownumber][$key],
'type' => $file['type']['multi_edit'][$rownumber][$key],
'size' => $file['size']['multi_edit'][$rownumber][$key],
'tmp_name' => $file['tmp_name']['multi_edit'][$rownumber][$key],
'error' => $file['error']['multi_edit'][$rownumber][$key],
);
return $new_file;
}
/**
* sets the name if the file to the one selected in the tbl_change form
*
* @param string $key the md5 hash of the column name
* @param string $rownumber
*
* @return boolean success
* @access public
*/
function setSelectedFromTblChangeRequest($key, $rownumber = null)
{
if (! empty($_REQUEST['fields_uploadlocal']['multi_edit'][$rownumber][$key])
&& is_string($_REQUEST['fields_uploadlocal']['multi_edit'][$rownumber][$key])
) {
// ... whether with multiple rows ...
return $this->setLocalSelectedFile(
$_REQUEST['fields_uploadlocal']['multi_edit'][$rownumber][$key]
);
} else {
return false;
}
}
/**
* Returns possible error message.
*
* @access public
* @return string error message
*/
function getError()
{
return $this->_error_message;
}
/**
* Checks whether there was any error.
*
* @access public
* @return boolean whether an error occured or not
*/
function isError()
{
return ! empty($this->_error_message);
}
/**
* checks the superglobals provided if the tbl_change form is submitted
* and uses the submitted/selected file
*
* @param string $key the md5 hash of the column name
* @param string $rownumber
*
* @return boolean success
* @access public
*/
function checkTblChangeForm($key, $rownumber)
{
if ($this->setUploadedFromTblChangeRequest($key, $rownumber)) {
// well done ...
$this->_error_message = '';
return true;
} elseif ($this->setSelectedFromTblChangeRequest($key, $rownumber)) {
// well done ...
$this->_error_message = '';
return true;
}
// all failed, whether just no file uploaded/selected or an error
return false;
}
/**
* Sets named file to be read from UploadDir.
*
* @param string $name
*
* @return boolean success
* @access public
*/
function setLocalSelectedFile($name)
{
if (empty($GLOBALS['cfg']['UploadDir'])) {
return false;
}
$this->setName(
PMA_CommonFunctions::getInstance()->userDir($GLOBALS['cfg']['UploadDir']) . PMA_securePath($name)
);
if (! $this->isReadable()) {
$this->_error_message = __('File could not be read');
$this->setName(null);
return false;
}
return true;
}
/**
* Checks whether file can be read.
*
* @access public
* @return boolean whether the file is readable or not
*/
function isReadable()
{
// suppress warnings from being displayed, but not from being logged
// any file access outside of open_basedir will issue a warning
ob_start();
$is_readable = is_readable($this->getName());
ob_end_clean();
return $is_readable;
}
/**
* If we are on a server with open_basedir, we must move the file
* before opening it. The FAQ 1.11 explains how to create the "./tmp"
* directory - if needed
*
* @todo move check of $cfg['TempDir'] into PMA_Config?
* @access public
* @return boolean whether uploaded fiel is fine or not
*/
function checkUploadedFile()
{
if ($this->isReadable()) {
return true;
}
if (empty($GLOBALS['cfg']['TempDir']) || ! is_writable($GLOBALS['cfg']['TempDir'])) {
// cannot create directory or access, point user to FAQ 1.11
$this->_error_message = __('Error moving the uploaded file, see [a@./Documentation.html#faq1_11@Documentation]FAQ 1.11[/a]');
return false;
}
$new_file_to_upload = tempnam(
realpath($GLOBALS['cfg']['TempDir']),
basename($this->getName())
);
// suppress warnings from being displayed, but not from being logged
// any file access outside of open_basedir will issue a warning
ob_start();
$move_uploaded_file_result = move_uploaded_file(
$this->getName(),
$new_file_to_upload
);
ob_end_clean();
if (! $move_uploaded_file_result) {
$this->_error_message = __('Error while moving uploaded file.');
return false;
}
$this->setName($new_file_to_upload);
$this->isTemp(true);
if (! $this->isReadable()) {
$this->_error_message = __('Cannot read (moved) upload file.');
return false;
}
return true;
}
/**
* Detects what compression filse uses
*
* @todo move file read part into readChunk() or getChunk()
* @todo add support for compression plugins
* @access protected
* @return string MIME type of compression, none for none
*/
function _detectCompression()
{
// suppress warnings from being displayed, but not from being logged
// f.e. any file access outside of open_basedir will issue a warning
ob_start();
$file = fopen($this->getName(), 'rb');
ob_end_clean();
if (! $file) {
$this->_error_message = __('File could not be read');
return false;
}
/**
* @todo
* get registered plugins for file compression
foreach (PMA_getPlugins($type = 'compression') as $plugin) {
if (call_user_func_array(array($plugin['classname'], 'canHandle'), array($this->getName()))) {
$this->setCompressionPlugin($plugin);
break;
}
}
*/
$test = fread($file, 4);
$len = strlen($test);
fclose($file);
if ($len >= 2 && $test[0] == chr(31) && $test[1] == chr(139)) {
$this->_compression = 'application/gzip';
} elseif ($len >= 3 && substr($test, 0, 3) == 'BZh') {
$this->_compression = 'application/bzip2';
} elseif ($len >= 4 && $test == "PK\003\004") {
$this->_compression = 'application/zip';
} else {
$this->_compression = 'none';
}
return $this->_compression;
}
/**
* whether the content should be decompressed before returned
*/
function setDecompressContent($decompress)
{
$this->_decompress = (bool) $decompress;
}
function getHandle()
{
if (null === $this->_handle) {
$this->open();
}
return $this->_handle;
}
function setHandle($handle)
{
$this->_handle = $handle;
}
/**
* Sets error message for unsupported compression.
*/
function errorUnsupported()
{
$this->_error_message = sprintf(
__('You attempted to load file with unsupported compression (%s). Either support for it is not implemented or disabled by your configuration.'),
$this->getCompression()
);
}
/**
* Attempts to open the file.
*
* @return bool
*/
function open()
{
if (! $this->_decompress) {
$this->_handle = @fopen($this->getName(), 'r');
}
switch ($this->getCompression()) {
case false:
return false;
case 'application/bzip2':
if ($GLOBALS['cfg']['BZipDump'] && @function_exists('bzopen')) {
$this->_handle = @bzopen($this->getName(), 'r');
} else {
$this->errorUnsupported();
return false;
}
break;
case 'application/gzip':
if ($GLOBALS['cfg']['GZipDump'] && @function_exists('gzopen')) {
$this->_handle = @gzopen($this->getName(), 'r');
} else {
$this->errorUnsupported();
return false;
}
break;
case 'application/zip':
if ($GLOBALS['cfg']['ZipDump'] && @function_exists('zip_open')) {
include_once './libraries/zip_extension.lib.php';
$result = PMA_getZipContents($this->getName());
if (! empty($result['error'])) {
$this->_error_message = PMA_Message::rawError($result['error']);
return false;
} else {
$this->content_uncompressed = $result['data'];
}
unset($result);
} else {
$this->errorUnsupported();
return false;
}
break;
case 'none':
$this->_handle = @fopen($this->getName(), 'r');
break;
default:
$this->errorUnsupported();
return false;
break;
}
return true;
}
function getCharset()
{
return $this->_charset;
}
function setCharset($charset)
{
$this->_charset = $charset;
}
/**
* Returns compression used by file.
*
* @return string MIME type of compression, none for none
* @access public
*/
function getCompression()
{
if (null === $this->_compression) {
return $this->_detectCompression();
}
return $this->_compression;
}
/**
* advances the file pointer in the file handle by $length bytes/chars
*
* @param integer $length numbers of chars/bytes to skip
*
* @return boolean
* @todo this function is unused
*/
function advanceFilePointer($length)
{
while ($length > 0) {
$this->getNextChunk($length);
$length -= $this->getChunkSize();
}
}
/**
* http://bugs.php.net/bug.php?id=29532
* bzip reads a maximum of 8192 bytes on windows systems
*
* @param int $max_size
*
* @return bool|string
* @todo this function is unused
*/
function getNextChunk($max_size = null)
{
if (null !== $max_size) {
$size = min($max_size, $this->getChunkSize());
} else {
$size = $this->getChunkSize();
}
// $result = $this->handler->getNextChunk($size);
$result = '';
switch ($this->getCompression()) {
case 'application/bzip2':
$result = '';
while (strlen($result) < $size - 8192 && ! feof($this->getHandle())) {
$result .= bzread($this->getHandle(), $size);
}
break;
case 'application/gzip':
$result = gzread($this->getHandle(), $size);
break;
case 'application/zip':
/*
* if getNextChunk() is used some day,
* replace this code by code similar to the one
* in open()
*
include_once './libraries/unzip.lib.php';
$import_handle = new SimpleUnzip();
$import_handle->ReadFile($this->getName());
if ($import_handle->Count() == 0) {
$this->_error_message = __('No files found inside ZIP archive!');
return false;
} elseif ($import_handle->GetError(0) != 0) {
$this->_error_message = __('Error in ZIP archive:')
. ' ' . $import_handle->GetErrorMsg(0);
return false;
} else {
$result = $import_handle->GetData(0);
}
*/
break;
case 'none':
$result = fread($this->getHandle(), $size);
break;
default:
return false;
}
if ($GLOBALS['charset_conversion']) {
$result = PMA_convert_string($this->getCharset(), 'utf-8', $result);
} else {
/**
* Skip possible byte order marks (I do not think we need more
* charsets, but feel free to add more, you can use wikipedia for
* reference: <http://en.wikipedia.org/wiki/Byte_Order_Mark>)
*
* @todo BOM could be used for charset autodetection
*/
if ($this->getOffset() === 0) {
// UTF-8
if (strncmp($result, "\xEF\xBB\xBF", 3) == 0) {
$result = substr($result, 3);
// UTF-16 BE, LE
} elseif (strncmp($result, "\xFE\xFF", 2) == 0
|| strncmp($result, "\xFF\xFE", 2) == 0) {
$result = substr($result, 2);
}
}
}
$this->_offset += $size;
if (0 === $result) {
return true;
}
return $result;
}
function getOffset()
{
return $this->_offset;
}
function getChunkSize()
{
return $this->_chunk_size;
}
function setChunkSize($chunk_size)
{
$this->_chunk_size = (int) $chunk_size;
}
function getContentLength()
{
return strlen($this->_content);
}
function eof()
{
if ($this->getHandle()) {
return feof($this->getHandle());
} else {
return ($this->getOffset() >= $this->getContentLength());
}
}
}
?>
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