529 lines
16 KiB
PHP
529 lines
16 KiB
PHP
<?php
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/* $Id$ */
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/**
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* @file
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* API for handling file uploads and server file management.
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*/
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/**
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* @defgroup file File interface
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* @{
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* Common file handling functions.
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*/
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define('IS_WINDOWS', substr(PHP_OS, 0, 3) == 'WIN');
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define('FILE_DOWNLOADS_PUBLIC', 1);
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define('FILE_DOWNLOADS_PRIVATE', 2);
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define('FILE_CREATE_DIRECTORY', 1);
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define('FILE_MODIFY_PERMISSIONS', 2);
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define('FILE_DIRECTORY_TEMP', IS_WINDOWS ? 'c:\\windows\\temp' : '/tmp');
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define('FILE_EXISTS_RENAME', 0);
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define('FILE_EXISTS_REPLACE', 1);
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define('FILE_EXISTS_ERROR', 2);
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/**
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* Create the download path to a file.
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*
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* @param $path Path to the file to generate URL for
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* @return URL pointing to the file
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*/
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function file_create_url($path) {
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if (strpos($path, variable_get('file_directory_path', 'files')) !== false) {
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$path = trim(substr($path, strlen(variable_get('file_directory_path', 'files'))), '\\/');
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}
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switch (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC)) {
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case FILE_DOWNLOADS_PUBLIC:
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return $GLOBALS['base_url'] .'/'. variable_get('file_directory_path', 'files') .'/'. str_replace('\\', '/', $path);
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case FILE_DOWNLOADS_PRIVATE:
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return url('system/files', 'file='. $path);
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}
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}
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/**
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* Make sure the destination is a complete path and resides in the
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* file system directory, if it is not prepend the
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* file system directory.
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*
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* @param $dest Path to verify
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* @return Path to file with file system directory appended if necessary.
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*/
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function file_create_path($dest = 0) {
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if (!$dest) {
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return variable_get('file_directory_path', 'files');
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}
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$regex = (IS_WINDOWS ? '.?:\\\\' : '/');
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if (!file_check_location($dest, variable_get('file_directory_path', 'files')) && !preg_match("|^$regex|", $dest)) {
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return variable_get('file_directory_path', 'files') .'/'. trim($dest, '\\/');
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}
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else {
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return $dest;
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}
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}
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/**
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* Check that directory exists and is writable.
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*
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* @param $directory Path to extract and verify directory for.
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* @param $mode Try to create the directory if it does not exist.
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* @param $form_item Optional name for a field item to attach potential errors to.
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* @return False when directory not found, or true when directory exists.
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*/
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function file_check_directory(&$directory, $mode = 0, $form_item = NULL) {
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$directory = rtrim($directory, '/\\');
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// Check if directory exists.
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if (!is_dir($directory)) {
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if (($mode & FILE_CREATE_DIRECTORY) && @mkdir($directory, 0760)) {
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drupal_set_message(t('Created directory %directory.', array('%directory' => "<em>$directory</em>")));
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}
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else {
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if ($form_item) {
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form_set_error($form_item, t('The directory %directory does not exist.', array('%directory' => "<em>$directory</em>")));
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}
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return false;
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}
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}
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// Check to see if the directory is writable.
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if (!is_writable($directory)) {
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if (($mode & FILE_MODIFY_PERMISSIONS) && @chmod($directory, 0760)) {
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drupal_set_message(t('Modified permissions on directory %directory.', array('%directory' => "<em>$directory</em>")));
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}
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else {
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form_set_error($form_item, t('The directory %directory is not writable.', array('%directory' => "<em>$directory</em>")));
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return false;
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}
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}
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return true;
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}
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/**
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* Checks path to see if it is a directory, or a dir/file.
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*
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* @param $path
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*/
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function file_check_path(&$path) {
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// Check if path is a directory.
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if (file_check_directory($path)) {
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return '';
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}
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// Check if path is a possible dir/file.
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$filename = basename($path);
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$path = dirname($path);
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if (file_check_directory($path)) {
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return $filename;
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}
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return false;
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}
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/**
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* Check if $source is a valid file upload.
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*
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* @param $source
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*/
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function file_check_upload($source) {
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if (is_object($source)) {
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if (is_file($source->filepath)) {
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return $source;
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}
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}
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elseif ($_FILES["edit"]["name"][$source] && is_uploaded_file($_FILES["edit"]["tmp_name"][$source])) {
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$file = new StdClass();
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$file->filename = trim(basename($_FILES["edit"]["name"][$source]), '.');
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$file->filemime = $_FILES["edit"]["type"][$source];
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$file->filepath = $_FILES["edit"]["tmp_name"][$source];
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$file->error = $_FILES["edit"]["error"][$source];
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$file->filesize = $_FILES["edit"]["size"][$source];
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$file->source = $source;
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return $file;
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}
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else {
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// In case of previews return previous file object.
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if (file_exists($_SESSION['file_uploads'][$source]->filepath)) {
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return $_SESSION['file_uploads'][$source];
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}
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}
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}
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/**
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* Check if a file is really located inside $directory. Should be used to make
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* sure a file specified is really located within the directory to prevent
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* exploits.
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*
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* @code
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* // Returns false:
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* file_check_location('/www/example.com/files/../../../etc/passwd', '/www/example.com/files');
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* @endcode
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*
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* @param $source A string set to the file to check.
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* @param $directory A string where the file should be located.
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* @return 0 for invalid path or the real path of the source.
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*/
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function file_check_location($source, $directory = 0) {
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$source = realpath($source);
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$directory = realpath($directory);
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if ($directory && strpos($source, $directory) !== 0) {
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return 0;
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}
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return $source;
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}
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/**
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* Copies a file to a new location. This is a powerful function that in many ways
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* performs like an advanced version of copy().
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* - Checks if $source and $dest are valid and readable/writable.
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* - Performs a file copy if $source is not equal to $dest.
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* - If file already exists in $dest either the call will error out, replace the
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* file or rename the file based on the $replace parameter.
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*
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* @param $source A string specifying the file location of the original file.
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* This parameter will contain the resulting destination filename in case of
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* success.
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* @param $dest A string containing the directory $source should be copied to.
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* @param $replace Replace behavior when the destination file already exists.
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* - FILE_EXISTS_REPLACE - Replace the existing file
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* - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique
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* - FILE_EXISTS_ERROR - Do nothing and return false.
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* @return True for success, false for failure.
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*/
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function file_copy(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
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$dest = file_create_path($dest);
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$directory = $dest;
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$basename = file_check_path($directory);
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// Make sure we at least have a valid directory.
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if ($basename === false) {
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drupal_set_message(t('File copy failed: no directory configured, or it could not be accessed.'), 'error');
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return 0;
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}
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// Process a file upload object.
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if (is_object($source)) {
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$file = $source;
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$source = $file->filepath;
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if (!$basename) {
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$basename = $file->filename;
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}
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}
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$source = realpath($source);
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if (!file_exists($source)) {
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drupal_set_message(t('File copy failed: source file does not exist.'), 'error');
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return 0;
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}
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// If destination file is not specified then use filename of source file.
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$basename = $basename ? $basename : basename($source);
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$dest = $directory .'/'. $basename;
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// Make sure source and destination filenames are not the same, makes no sense
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// to copy it if they are. In fact copying the file will most likely result in
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// a 0 byte file. Which is bad. Real bad.
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if ($source != realpath($dest)) {
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if (file_exists($dest)) {
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switch ($replace) {
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case FILE_EXISTS_RENAME:
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// Destination file already exists and we can't replace is so we try and
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// and find a new filename.
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if ($pos = strrpos($basename, '.')) {
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$name = substr($basename, 0, $pos);
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$ext = substr($basename, $pos);
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}
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else {
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$name = $basename;
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}
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$counter = 0;
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do {
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$dest = $directory .'/'. $name .'_'. $counter++ . $ext;
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} while (file_exists($dest));
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break;
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case FILE_EXISTS_ERROR:
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drupal_set_message(t('File copy failed. File already exists.'), 'error');
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return 0;
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case FILE_EXISTS_REPLACE:
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// Leave $dest where it is for replace.
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}
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}
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if (!@copy($source, $dest)) {
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drupal_set_message(t('File copy failed.'), 'error');
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return 0;
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}
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}
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if (is_object($file)) {
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$file->filename = $basename;
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$file->filepath = $dest;
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$source = $file;
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}
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else {
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$source = $dest;
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}
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return 1; // Everything went ok.
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}
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/**
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* Moves a file to a new location.
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* - Checks if $source and $dest are valid and readable/writable.
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* - Performs a file move if $source is not equal to $dest.
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* - If file already exists in $dest either the call will error out, replace the
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* file or rename the file based on the $replace parameter.
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*
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* @param $source A string specifying the file location of the original file.
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* This parameter will contain the resulting destination filename in case of
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* success.
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* @param $dest A string containing the directory $source should be copied to.
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* @param $replace Replace behavior when the destination file already exists.
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* - FILE_EXISTS_REPLACE - Replace the existing file
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* - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique
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* - FILE_EXISTS_ERROR - Do nothing and return false.
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* @return True for success, false for failure.
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*/
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function file_move(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
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$path_original = is_object($source) ? $source->filepath : $source;
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if (file_copy($source, $dest, $replace)) {
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$path_current = is_object($source) ? $source->filepath : $source;
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if ($path_original == $path_current || file_delete($path_original)) {
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return 1;
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}
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drupal_set_message(t('Removing original file failed.'), 'error');
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}
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return 0;
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}
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function file_create_filename($basename, $directory) {
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$dest = $directory .'/'. $basename;
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if (file_exists($dest)) {
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// Destination file already exists, generate an alternative.
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if ($pos = strrpos($basename, '.')) {
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$name = substr($basename, 0, $pos);
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$ext = substr($basename, $pos);
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}
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else {
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$name = $basename;
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}
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$counter = 0;
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do {
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$dest = $directory .'/'. $name .'_'. $counter++ . $ext;
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} while (file_exists($dest));
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}
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return $dest;
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}
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function file_delete($path) {
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if (is_file($path)) {
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return unlink($path);
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}
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}
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/**
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* Saves a file upload to a new location. The source file is validated as a
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* proper upload and handled as such.
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*
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* @param $source A string specifying the name of the upload field to save.
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* This parameter will contain the resulting destination filename in case of
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* success.
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* @param $dest A string containing the directory $source should be copied to,
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* will use the temporary directory in case no other value is set.
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* @param $replace A boolean, set to true if the destination should be replaced
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* when in use, but when false append a _X to the filename.
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* @return An object containing file info or 0 in case of error.
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*/
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function file_save_upload($source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
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// Make sure $source exists in $_FILES.
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if ($file = file_check_upload($source)) {
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if (!$dest) {
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$dest = variable_get('file_directory_temp', FILE_DIRECTORY_TEMP);
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$temporary = 1;
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if (is_file($file->filepath)) {
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// If this file was uploaded by this user before replace the temporary copy.
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$replace = 1;
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}
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}
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if (!user_access('bypass input data check') && !valid_input_data($file)) {
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watchdog('security', t('Possible exploit abuse: invalid data.'), WATCHDOG_WARNING);
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drupal_set_message(t('File upload failed: invalid data.'), 'error');
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return 0;
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}
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// Check for file upload errors.
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switch ($file->error) {
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case 0: // UPLOAD_ERR_OK
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break;
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case 1: // UPLOAD_ERR_INI_SIZE
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case 2: // UPLOAD_ERR_FORM_SIZE
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drupal_set_message(t('File upload failed: file size too big.'), 'error');
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return 0;
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case 3: // UPLOAD_ERR_PARTIAL
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case 4: // UPLOAD_ERR_NO_FILE
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drupal_set_message(t('File upload failed: incomplete upload.'), 'error');
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return 0;
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default: // Unknown error
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drupal_set_message(t('File upload failed: unknown error.'), 'error');
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return 0;
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}
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unset($_SESSION['file_uploads'][is_object($source) ? $source->source : $source]);
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if (file_move($file, $dest, $replace)) {
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if ($temporary) {
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$_SESSION['file_uploads'][is_object($source) ? $source->source : $source] = $file;
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}
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return $file;
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}
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return 0;
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}
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return 0;
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}
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/**
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* Save a string to the specified destination
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*
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* @param $data A string containing the contents of the file
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* @param $dest A string containing the destination location
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*
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* @return A string containing the resulting filename or 0 on error
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*/
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function file_save_data($data, $dest, $replace = FILE_EXISTS_RENAME) {
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if (!user_access('bypass input data check') && !valid_input_data($data)) {
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watchdog('security', t('Possible exploit abuse: invalid data.'), WATCHDOG_WARNING);
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drupal_set_message(t('File upload failed: invalid data.'), 'error');
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return 0;
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}
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$temp = variable_get('file_directory_temp', FILE_DIRECTORY_TEMP);
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$file = tempnam($temp, 'file');
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if (!$fp = fopen($file, 'wb')) {
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drupal_set_message(t('Unable to create file.'), 'error');
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return 0;
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}
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fwrite($fp, $data);
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fclose($fp);
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if (!file_move($file, $dest, $replace)) {
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return 0;
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}
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return $file;
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}
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/**
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* Transfer file using http to client. Pipes a file through Drupal to the
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* client.
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*
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* @param $source File to transfer.
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* @param $headers An array of http headers to send along with file.
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*/
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function file_transfer($source, $headers) {
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ob_end_clean();
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foreach ($headers as $header) {
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header($header);
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}
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$source = file_create_path($source);
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// Transfer file in 1024 byte chunks to save memory usage.
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$fd = fopen($source, 'rb');
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while (!feof($fd)) {
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print fread($fd, 1024);
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}
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fclose($fd);
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exit();
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}
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/**
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* Call modules to find out if a file is accessible for a given user.
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*/
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function file_download() {
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$file = $_GET['file'];
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if (file_exists(file_create_path($file))) {
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$list = module_list();
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foreach ($list as $module) {
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$headers = module_invoke($module, 'file_download', $file);
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if ($headers === -1) {
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drupal_access_denied();
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}
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elseif (is_array($headers)) {
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file_transfer($file, $headers);
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}
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}
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}
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drupal_not_found();
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}
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/**
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* Finds all files that match a given mask in a given
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* directory.
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*
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* @param $dir
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* The base directory for the scan.
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* @param $mask
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* The regular expression of the files to find.
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* @param $nomask
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* An array of files/directories to ignore.
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* @param $callback
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* The callback function to call for each match.
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* @param $recurse
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* When TRUE, the directory scan will recurse the entire tree
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* starting at the provided directory.
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* @param $key
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* The key to be used for the returned array of files. Possible
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* values are "filename", for the path starting with $dir,
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* "basename", for the basename of the file, and "name" for the name
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* of the file without an extension.
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*
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* @return
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* An associative array (keyed on the provided key) of objects with
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* "path", "basename", and "name" members corresponding to the
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* matching files.
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*/
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function file_scan_directory($dir, $mask, $nomask = array('.', '..', 'CVS'), $callback = 0, $recurse = TRUE, $key = 'filename') {
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$key = (in_array($key, array('filename', 'basename', 'name')) ? $key : 'filename');
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$files = array();
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if (is_dir($dir) && $handle = opendir($dir)) {
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while ($file = readdir($handle)) {
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if (!in_array($file, $nomask)) {
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if (is_dir("$dir/$file") && $recurse) {
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$files = array_merge($files, file_scan_directory("$dir/$file", $mask, $nomask, $callback, $recurse, $key));
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}
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elseif (ereg($mask, $file)) {
|
|
$filename = "$dir/$file";
|
|
$basename = basename($file);
|
|
$name = substr($basename, 0, strrpos($basename, '.'));
|
|
$files[$$key] = new stdClass();
|
|
$files[$$key]->filename = $filename;
|
|
$files[$$key]->basename = $basename;
|
|
$files[$$key]->name = $name;
|
|
if ($callback) {
|
|
$callback($filename);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
closedir($handle);
|
|
}
|
|
|
|
return $files;
|
|
}
|
|
|
|
?>
|