--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/cms/drupal/includes/file.inc Fri Sep 08 12:04:06 2017 +0200
@@ -0,0 +1,2591 @@
+<?php
+
+/**
+ * @file
+ * API for handling file uploads and server file management.
+ */
+
+/**
+ * Manually include stream wrapper code.
+ *
+ * Stream wrapper code is included here because there are cases where
+ * File API is needed before a bootstrap, or in an alternate order (e.g.
+ * maintenance theme).
+ */
+require_once DRUPAL_ROOT . '/includes/stream_wrappers.inc';
+
+/**
+ * @defgroup file File interface
+ * @{
+ * Common file handling functions.
+ *
+ * Fields on the file object:
+ * - fid: File ID
+ * - uid: The {users}.uid of the user who is associated with the file.
+ * - filename: Name of the file with no path components. This may differ from
+ * the basename of the filepath if the file is renamed to avoid overwriting
+ * an existing file.
+ * - uri: URI of the file.
+ * - filemime: The file's MIME type.
+ * - filesize: The size of the file in bytes.
+ * - status: A bitmapped field indicating the status of the file. The first 8
+ * bits are reserved for Drupal core. The least significant bit indicates
+ * temporary (0) or permanent (1). Temporary files older than
+ * DRUPAL_MAXIMUM_TEMP_FILE_AGE will be removed during cron runs.
+ * - timestamp: UNIX timestamp for the date the file was added to the database.
+ */
+
+/**
+ * Flag used by file_prepare_directory() -- create directory if not present.
+ */
+define('FILE_CREATE_DIRECTORY', 1);
+
+/**
+ * Flag used by file_prepare_directory() -- file permissions may be changed.
+ */
+define('FILE_MODIFY_PERMISSIONS', 2);
+
+/**
+ * Flag for dealing with existing files: Appends number until name is unique.
+ */
+define('FILE_EXISTS_RENAME', 0);
+
+/**
+ * Flag for dealing with existing files: Replace the existing file.
+ */
+define('FILE_EXISTS_REPLACE', 1);
+
+/**
+ * Flag for dealing with existing files: Do nothing and return FALSE.
+ */
+define('FILE_EXISTS_ERROR', 2);
+
+/**
+ * Indicates that the file is permanent and should not be deleted.
+ *
+ * Temporary files older than DRUPAL_MAXIMUM_TEMP_FILE_AGE will be removed
+ * during cron runs, but permanent files will not be removed during the file
+ * garbage collection process.
+ */
+define('FILE_STATUS_PERMANENT', 1);
+
+/**
+ * Provides Drupal stream wrapper registry.
+ *
+ * A stream wrapper is an abstraction of a file system that allows Drupal to
+ * use the same set of methods to access both local files and remote resources.
+ *
+ * Provide a facility for managing and querying user-defined stream wrappers
+ * in PHP. PHP's internal stream_get_wrappers() doesn't return the class
+ * registered to handle a stream, which we need to be able to find the handler
+ * for class instantiation.
+ *
+ * If a module registers a scheme that is already registered with PHP, the
+ * existing scheme will be unregistered and replaced with the specified class.
+ *
+ * A stream is referenced as "scheme://target".
+ *
+ * The optional $filter parameter can be used to retrieve only the stream
+ * wrappers that are appropriate for particular usage. For example, this returns
+ * only stream wrappers that use local file storage:
+ * @code
+ * $local_stream_wrappers = file_get_stream_wrappers(STREAM_WRAPPERS_LOCAL);
+ * @endcode
+ *
+ * The $filter parameter can only filter to types containing a particular flag.
+ * In some cases, you may want to filter to types that do not contain a
+ * particular flag. For example, you may want to retrieve all stream wrappers
+ * that are not writable, or all stream wrappers that are not local. PHP's
+ * array_diff_key() function can be used to help with this. For example, this
+ * returns only stream wrappers that do not use local file storage:
+ * @code
+ * $remote_stream_wrappers = array_diff_key(file_get_stream_wrappers(STREAM_WRAPPERS_ALL), file_get_stream_wrappers(STREAM_WRAPPERS_LOCAL));
+ * @endcode
+ *
+ * @param $filter
+ * (Optional) Filters out all types except those with an on bit for each on
+ * bit in $filter. For example, if $filter is STREAM_WRAPPERS_WRITE_VISIBLE,
+ * which is equal to (STREAM_WRAPPERS_READ | STREAM_WRAPPERS_WRITE |
+ * STREAM_WRAPPERS_VISIBLE), then only stream wrappers with all three of these
+ * bits set are returned. Defaults to STREAM_WRAPPERS_ALL, which returns all
+ * registered stream wrappers.
+ *
+ * @return
+ * An array keyed by scheme, with values containing an array of information
+ * about the stream wrapper, as returned by hook_stream_wrappers(). If $filter
+ * is omitted or set to STREAM_WRAPPERS_ALL, the entire Drupal stream wrapper
+ * registry is returned. Otherwise only the stream wrappers whose 'type'
+ * bitmask has an on bit for each bit specified in $filter are returned.
+ *
+ * @see hook_stream_wrappers()
+ * @see hook_stream_wrappers_alter()
+ */
+function file_get_stream_wrappers($filter = STREAM_WRAPPERS_ALL) {
+ $wrappers_storage = &drupal_static(__FUNCTION__);
+
+ if (!isset($wrappers_storage)) {
+ $wrappers = module_invoke_all('stream_wrappers');
+ foreach ($wrappers as $scheme => $info) {
+ // Add defaults.
+ $wrappers[$scheme] += array('type' => STREAM_WRAPPERS_NORMAL);
+ }
+ drupal_alter('stream_wrappers', $wrappers);
+ $existing = stream_get_wrappers();
+ foreach ($wrappers as $scheme => $info) {
+ // We only register classes that implement our interface.
+ if (in_array('DrupalStreamWrapperInterface', class_implements($info['class']), TRUE)) {
+ // Record whether we are overriding an existing scheme.
+ if (in_array($scheme, $existing, TRUE)) {
+ $wrappers[$scheme]['override'] = TRUE;
+ stream_wrapper_unregister($scheme);
+ }
+ else {
+ $wrappers[$scheme]['override'] = FALSE;
+ }
+ if (($info['type'] & STREAM_WRAPPERS_LOCAL) == STREAM_WRAPPERS_LOCAL) {
+ stream_wrapper_register($scheme, $info['class']);
+ }
+ else {
+ stream_wrapper_register($scheme, $info['class'], STREAM_IS_URL);
+ }
+ }
+ // Pre-populate the static cache with the filters most typically used.
+ $wrappers_storage[STREAM_WRAPPERS_ALL][$scheme] = $wrappers[$scheme];
+ if (($info['type'] & STREAM_WRAPPERS_WRITE_VISIBLE) == STREAM_WRAPPERS_WRITE_VISIBLE) {
+ $wrappers_storage[STREAM_WRAPPERS_WRITE_VISIBLE][$scheme] = $wrappers[$scheme];
+ }
+ }
+ }
+
+ if (!isset($wrappers_storage[$filter])) {
+ $wrappers_storage[$filter] = array();
+ foreach ($wrappers_storage[STREAM_WRAPPERS_ALL] as $scheme => $info) {
+ // Bit-wise filter.
+ if (($info['type'] & $filter) == $filter) {
+ $wrappers_storage[$filter][$scheme] = $info;
+ }
+ }
+ }
+
+ return $wrappers_storage[$filter];
+}
+
+/**
+ * Returns the stream wrapper class name for a given scheme.
+ *
+ * @param $scheme
+ * Stream scheme.
+ *
+ * @return
+ * Return string if a scheme has a registered handler, or FALSE.
+ */
+function file_stream_wrapper_get_class($scheme) {
+ $wrappers = file_get_stream_wrappers();
+ return empty($wrappers[$scheme]) ? FALSE : $wrappers[$scheme]['class'];
+}
+
+/**
+ * Returns the scheme of a URI (e.g. a stream).
+ *
+ * @param $uri
+ * A stream, referenced as "scheme://target".
+ *
+ * @return
+ * A string containing the name of the scheme, or FALSE if none. For example,
+ * the URI "public://example.txt" would return "public".
+ *
+ * @see file_uri_target()
+ */
+function file_uri_scheme($uri) {
+ $position = strpos($uri, '://');
+ return $position ? substr($uri, 0, $position) : FALSE;
+}
+
+/**
+ * Checks that the scheme of a stream URI is valid.
+ *
+ * Confirms that there is a registered stream handler for the provided scheme
+ * and that it is callable. This is useful if you want to confirm a valid
+ * scheme without creating a new instance of the registered handler.
+ *
+ * @param $scheme
+ * A URI scheme, a stream is referenced as "scheme://target".
+ *
+ * @return
+ * Returns TRUE if the string is the name of a validated stream,
+ * or FALSE if the scheme does not have a registered handler.
+ */
+function file_stream_wrapper_valid_scheme($scheme) {
+ // Does the scheme have a registered handler that is callable?
+ $class = file_stream_wrapper_get_class($scheme);
+ if (class_exists($class)) {
+ return TRUE;
+ }
+ else {
+ return FALSE;
+ }
+}
+
+
+/**
+ * Returns the part of a URI after the schema.
+ *
+ * @param $uri
+ * A stream, referenced as "scheme://target".
+ *
+ * @return
+ * A string containing the target (path), or FALSE if none.
+ * For example, the URI "public://sample/test.txt" would return
+ * "sample/test.txt".
+ *
+ * @see file_uri_scheme()
+ */
+function file_uri_target($uri) {
+ $data = explode('://', $uri, 2);
+
+ // Remove erroneous leading or trailing, forward-slashes and backslashes.
+ return count($data) == 2 ? trim($data[1], '\/') : FALSE;
+}
+
+/**
+ * Gets the default file stream implementation.
+ *
+ * @return
+ * 'public', 'private' or any other file scheme defined as the default.
+ */
+function file_default_scheme() {
+ return variable_get('file_default_scheme', 'public');
+}
+
+/**
+ * Normalizes a URI by making it syntactically correct.
+ *
+ * A stream is referenced as "scheme://target".
+ *
+ * The following actions are taken:
+ * - Remove trailing slashes from target
+ * - Trim erroneous leading slashes from target. e.g. ":///" becomes "://".
+ *
+ * @param $uri
+ * String reference containing the URI to normalize.
+ *
+ * @return
+ * The normalized URI.
+ */
+function file_stream_wrapper_uri_normalize($uri) {
+ // Inline file_uri_scheme() function call for performance reasons.
+ $position = strpos($uri, '://');
+ $scheme = $position ? substr($uri, 0, $position) : FALSE;
+
+ if ($scheme && file_stream_wrapper_valid_scheme($scheme)) {
+ $target = file_uri_target($uri);
+
+ if ($target !== FALSE) {
+ $uri = $scheme . '://' . $target;
+ }
+ }
+ return $uri;
+}
+
+/**
+ * Returns a reference to the stream wrapper class responsible for a given URI.
+ *
+ * The scheme determines the stream wrapper class that should be
+ * used by consulting the stream wrapper registry.
+ *
+ * @param $uri
+ * A stream, referenced as "scheme://target".
+ *
+ * @return
+ * Returns a new stream wrapper object appropriate for the given URI or FALSE
+ * if no registered handler could be found. For example, a URI of
+ * "private://example.txt" would return a new private stream wrapper object
+ * (DrupalPrivateStreamWrapper).
+ */
+function file_stream_wrapper_get_instance_by_uri($uri) {
+ $scheme = file_uri_scheme($uri);
+ $class = file_stream_wrapper_get_class($scheme);
+ if (class_exists($class)) {
+ $instance = new $class();
+ $instance->setUri($uri);
+ return $instance;
+ }
+ else {
+ return FALSE;
+ }
+}
+
+/**
+ * Returns a reference to the stream wrapper class responsible for a scheme.
+ *
+ * This helper method returns a stream instance using a scheme. That is, the
+ * passed string does not contain a "://". For example, "public" is a scheme
+ * but "public://" is a URI (stream). This is because the later contains both
+ * a scheme and target despite target being empty.
+ *
+ * Note: the instance URI will be initialized to "scheme://" so that you can
+ * make the customary method calls as if you had retrieved an instance by URI.
+ *
+ * @param $scheme
+ * If the stream was "public://target", "public" would be the scheme.
+ *
+ * @return
+ * Returns a new stream wrapper object appropriate for the given $scheme.
+ * For example, for the public scheme a stream wrapper object
+ * (DrupalPublicStreamWrapper).
+ * FALSE is returned if no registered handler could be found.
+ */
+function file_stream_wrapper_get_instance_by_scheme($scheme) {
+ $class = file_stream_wrapper_get_class($scheme);
+ if (class_exists($class)) {
+ $instance = new $class();
+ $instance->setUri($scheme . '://');
+ return $instance;
+ }
+ else {
+ return FALSE;
+ }
+}
+
+/**
+ * Creates a web-accessible URL for a stream to an external or local file.
+ *
+ * Compatibility: normal paths and stream wrappers.
+ *
+ * There are two kinds of local files:
+ * - "managed files", i.e. those stored by a Drupal-compatible stream wrapper.
+ * These are files that have either been uploaded by users or were generated
+ * automatically (for example through CSS aggregation).
+ * - "shipped files", i.e. those outside of the files directory, which ship as
+ * part of Drupal core or contributed modules or themes.
+ *
+ * @param $uri
+ * The URI to a file for which we need an external URL, or the path to a
+ * shipped file.
+ *
+ * @return
+ * A string containing a URL that may be used to access the file.
+ * If the provided string already contains a preceding 'http', 'https', or
+ * '/', nothing is done and the same string is returned. If a stream wrapper
+ * could not be found to generate an external URL, then FALSE is returned.
+ *
+ * @see http://drupal.org/node/515192
+ */
+function file_create_url($uri) {
+ // Allow the URI to be altered, e.g. to serve a file from a CDN or static
+ // file server.
+ drupal_alter('file_url', $uri);
+
+ $scheme = file_uri_scheme($uri);
+
+ if (!$scheme) {
+ // Allow for:
+ // - root-relative URIs (e.g. /foo.jpg in http://example.com/foo.jpg)
+ // - protocol-relative URIs (e.g. //bar.jpg, which is expanded to
+ // http://example.com/bar.jpg by the browser when viewing a page over
+ // HTTP and to https://example.com/bar.jpg when viewing a HTTPS page)
+ // Both types of relative URIs are characterized by a leading slash, hence
+ // we can use a single check.
+ if (drupal_substr($uri, 0, 1) == '/') {
+ return $uri;
+ }
+ else {
+ // If this is not a properly formatted stream, then it is a shipped file.
+ // Therefore, return the urlencoded URI with the base URL prepended.
+ return $GLOBALS['base_url'] . '/' . drupal_encode_path($uri);
+ }
+ }
+ elseif ($scheme == 'http' || $scheme == 'https') {
+ // Check for HTTP so that we don't have to implement getExternalUrl() for
+ // the HTTP wrapper.
+ return $uri;
+ }
+ else {
+ // Attempt to return an external URL using the appropriate wrapper.
+ if ($wrapper = file_stream_wrapper_get_instance_by_uri($uri)) {
+ return $wrapper->getExternalUrl();
+ }
+ else {
+ return FALSE;
+ }
+ }
+}
+
+/**
+ * Checks that the directory exists and is writable.
+ *
+ * Directories need to have execute permissions to be considered a directory by
+ * FTP servers, etc.
+ *
+ * @param $directory
+ * A string reference containing the name of a directory path or URI. A
+ * trailing slash will be trimmed from a path.
+ * @param $options
+ * A bitmask to indicate if the directory should be created if it does
+ * not exist (FILE_CREATE_DIRECTORY) or made writable if it is read-only
+ * (FILE_MODIFY_PERMISSIONS).
+ *
+ * @return
+ * TRUE if the directory exists (or was created) and is writable. FALSE
+ * otherwise.
+ */
+function file_prepare_directory(&$directory, $options = FILE_MODIFY_PERMISSIONS) {
+ if (!file_stream_wrapper_valid_scheme(file_uri_scheme($directory))) {
+ // Only trim if we're not dealing with a stream.
+ $directory = rtrim($directory, '/\\');
+ }
+
+ // Check if directory exists.
+ if (!is_dir($directory)) {
+ // Let mkdir() recursively create directories and use the default directory
+ // permissions.
+ if (($options & FILE_CREATE_DIRECTORY) && @drupal_mkdir($directory, NULL, TRUE)) {
+ return drupal_chmod($directory);
+ }
+ return FALSE;
+ }
+ // The directory exists, so check to see if it is writable.
+ $writable = is_writable($directory);
+ if (!$writable && ($options & FILE_MODIFY_PERMISSIONS)) {
+ return drupal_chmod($directory);
+ }
+
+ return $writable;
+}
+
+/**
+ * Creates a .htaccess file in each Drupal files directory if it is missing.
+ */
+function file_ensure_htaccess() {
+ file_create_htaccess('public://', FALSE);
+ if (variable_get('file_private_path', FALSE)) {
+ file_create_htaccess('private://', TRUE);
+ }
+ file_create_htaccess('temporary://', TRUE);
+}
+
+/**
+ * Creates a .htaccess file in the given directory.
+ *
+ * @param $directory
+ * The directory.
+ * @param $private
+ * FALSE indicates that $directory should be an open and public directory.
+ * The default is TRUE which indicates a private and protected directory.
+ * @param $force_overwrite
+ * Set to TRUE to attempt to overwrite the existing .htaccess file if one is
+ * already present. Defaults to FALSE.
+ */
+function file_create_htaccess($directory, $private = TRUE, $force_overwrite = FALSE) {
+ if (file_uri_scheme($directory)) {
+ $directory = file_stream_wrapper_uri_normalize($directory);
+ }
+ else {
+ $directory = rtrim($directory, '/\\');
+ }
+ $htaccess_path = $directory . '/.htaccess';
+
+ if (file_exists($htaccess_path) && !$force_overwrite) {
+ // Short circuit if the .htaccess file already exists.
+ return;
+ }
+
+ $htaccess_lines = file_htaccess_lines($private);
+
+ // Write the .htaccess file.
+ if (file_put_contents($htaccess_path, $htaccess_lines)) {
+ drupal_chmod($htaccess_path, 0444);
+ }
+ else {
+ $variables = array('%directory' => $directory, '!htaccess' => '<br />' . nl2br(check_plain($htaccess_lines)));
+ watchdog('security', "Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>!htaccess</code>", $variables, WATCHDOG_ERROR);
+ }
+}
+
+/**
+ * Returns the standard .htaccess lines that Drupal writes to file directories.
+ *
+ * @param $private
+ * (Optional) Set to FALSE to return the .htaccess lines for an open and
+ * public directory. The default is TRUE, which returns the .htaccess lines
+ * for a private and protected directory.
+ *
+ * @return
+ * A string representing the desired contents of the .htaccess file.
+ *
+ * @see file_create_htaccess()
+ */
+function file_htaccess_lines($private = TRUE) {
+ $lines = <<<EOF
+# Turn off all options we don't need.
+Options None
+Options +FollowSymLinks
+
+# Set the catch-all handler to prevent scripts from being executed.
+SetHandler Drupal_Security_Do_Not_Remove_See_SA_2006_006
+<Files *>
+ # Override the handler again if we're run later in the evaluation list.
+ SetHandler Drupal_Security_Do_Not_Remove_See_SA_2013_003
+</Files>
+
+# If we know how to do it safely, disable the PHP engine entirely.
+<IfModule mod_php5.c>
+ php_flag engine off
+</IfModule>
+EOF;
+
+ if ($private) {
+ $lines = <<<EOF
+# Deny all requests from Apache 2.4+.
+<IfModule mod_authz_core.c>
+ Require all denied
+</IfModule>
+
+# Deny all requests from Apache 2.0-2.2.
+<IfModule !mod_authz_core.c>
+ Deny from all
+</IfModule>
+EOF
+ . "\n\n" . $lines;
+ }
+
+ return $lines;
+}
+
+/**
+ * Loads file objects from the database.
+ *
+ * @param $fids
+ * An array of file IDs.
+ * @param $conditions
+ * (deprecated) An associative array of conditions on the {file_managed}
+ * table, where the keys are the database fields and the values are the
+ * values those fields must have. Instead, it is preferable to use
+ * EntityFieldQuery to retrieve a list of entity IDs loadable by
+ * this function.
+ *
+ * @return
+ * An array of file objects, indexed by fid.
+ *
+ * @todo Remove $conditions in Drupal 8.
+ *
+ * @see hook_file_load()
+ * @see file_load()
+ * @see entity_load()
+ * @see EntityFieldQuery
+ */
+function file_load_multiple($fids = array(), $conditions = array()) {
+ return entity_load('file', $fids, $conditions);
+}
+
+/**
+ * Loads a single file object from the database.
+ *
+ * @param $fid
+ * A file ID.
+ *
+ * @return
+ * An object representing the file, or FALSE if the file was not found.
+ *
+ * @see hook_file_load()
+ * @see file_load_multiple()
+ */
+function file_load($fid) {
+ $files = file_load_multiple(array($fid), array());
+ return reset($files);
+}
+
+/**
+ * Saves a file object to the database.
+ *
+ * If the $file->fid is not set a new record will be added.
+ *
+ * @param $file
+ * A file object returned by file_load().
+ *
+ * @return
+ * The updated file object.
+ *
+ * @see hook_file_insert()
+ * @see hook_file_update()
+ */
+function file_save(stdClass $file) {
+ $file->timestamp = REQUEST_TIME;
+ $file->filesize = filesize($file->uri);
+
+ // Load the stored entity, if any.
+ if (!empty($file->fid) && !isset($file->original)) {
+ $file->original = entity_load_unchanged('file', $file->fid);
+ }
+
+ module_invoke_all('file_presave', $file);
+ module_invoke_all('entity_presave', $file, 'file');
+
+ if (empty($file->fid)) {
+ drupal_write_record('file_managed', $file);
+ // Inform modules about the newly added file.
+ module_invoke_all('file_insert', $file);
+ module_invoke_all('entity_insert', $file, 'file');
+ }
+ else {
+ drupal_write_record('file_managed', $file, 'fid');
+ // Inform modules that the file has been updated.
+ module_invoke_all('file_update', $file);
+ module_invoke_all('entity_update', $file, 'file');
+ }
+
+ // Clear internal properties.
+ unset($file->original);
+ // Clear the static loading cache.
+ entity_get_controller('file')->resetCache(array($file->fid));
+
+ return $file;
+}
+
+/**
+ * Determines where a file is used.
+ *
+ * @param $file
+ * A file object.
+ *
+ * @return
+ * A nested array with usage data. The first level is keyed by module name,
+ * the second by object type and the third by the object id. The value
+ * of the third level contains the usage count.
+ *
+ * @see file_usage_add()
+ * @see file_usage_delete()
+ */
+function file_usage_list(stdClass $file) {
+ $result = db_select('file_usage', 'f')
+ ->fields('f', array('module', 'type', 'id', 'count'))
+ ->condition('fid', $file->fid)
+ ->condition('count', 0, '>')
+ ->execute();
+ $references = array();
+ foreach ($result as $usage) {
+ $references[$usage->module][$usage->type][$usage->id] = $usage->count;
+ }
+ return $references;
+}
+
+/**
+ * Records that a module is using a file.
+ *
+ * This usage information will be queried during file_delete() to ensure that
+ * a file is not in use before it is physically removed from disk.
+ *
+ * Examples:
+ * - A module that associates files with nodes, so $type would be
+ * 'node' and $id would be the node's nid. Files for all revisions are stored
+ * within a single nid.
+ * - The User module associates an image with a user, so $type would be 'user'
+ * and the $id would be the user's uid.
+ *
+ * @param $file
+ * A file object.
+ * @param $module
+ * The name of the module using the file.
+ * @param $type
+ * The type of the object that contains the referenced file.
+ * @param $id
+ * The unique, numeric ID of the object containing the referenced file.
+ * @param $count
+ * (optional) The number of references to add to the object. Defaults to 1.
+ *
+ * @see file_usage_list()
+ * @see file_usage_delete()
+ */
+function file_usage_add(stdClass $file, $module, $type, $id, $count = 1) {
+ db_merge('file_usage')
+ ->key(array(
+ 'fid' => $file->fid,
+ 'module' => $module,
+ 'type' => $type,
+ 'id' => $id,
+ ))
+ ->fields(array('count' => $count))
+ ->expression('count', 'count + :count', array(':count' => $count))
+ ->execute();
+}
+
+/**
+ * Removes a record to indicate that a module is no longer using a file.
+ *
+ * The file_delete() function is typically called after removing a file usage
+ * to remove the record from the file_managed table and delete the file itself.
+ *
+ * @param $file
+ * A file object.
+ * @param $module
+ * The name of the module using the file.
+ * @param $type
+ * (optional) The type of the object that contains the referenced file. May
+ * be omitted if all module references to a file are being deleted.
+ * @param $id
+ * (optional) The unique, numeric ID of the object containing the referenced
+ * file. May be omitted if all module references to a file are being deleted.
+ * @param $count
+ * (optional) The number of references to delete from the object. Defaults to
+ * 1. 0 may be specified to delete all references to the file within a
+ * specific object.
+ *
+ * @see file_usage_add()
+ * @see file_usage_list()
+ * @see file_delete()
+ */
+function file_usage_delete(stdClass $file, $module, $type = NULL, $id = NULL, $count = 1) {
+ // Delete rows that have a exact or less value to prevent empty rows.
+ $query = db_delete('file_usage')
+ ->condition('module', $module)
+ ->condition('fid', $file->fid);
+ if ($type && $id) {
+ $query
+ ->condition('type', $type)
+ ->condition('id', $id);
+ }
+ if ($count) {
+ $query->condition('count', $count, '<=');
+ }
+ $result = $query->execute();
+
+ // If the row has more than the specified count decrement it by that number.
+ if (!$result && $count > 0) {
+ $query = db_update('file_usage')
+ ->condition('module', $module)
+ ->condition('fid', $file->fid);
+ if ($type && $id) {
+ $query
+ ->condition('type', $type)
+ ->condition('id', $id);
+ }
+ $query->expression('count', 'count - :count', array(':count' => $count));
+ $query->execute();
+ }
+}
+
+/**
+ * Copies a file to a new location and adds a file record to the database.
+ *
+ * This function should be used when manipulating files that have records
+ * stored in the database. This is a powerful function that in many ways
+ * performs like an advanced version of copy().
+ * - Checks if $source and $destination are valid and readable/writable.
+ * - If file already exists in $destination either the call will error out,
+ * replace the file or rename the file based on the $replace parameter.
+ * - If the $source and $destination are equal, the behavior depends on the
+ * $replace parameter. FILE_EXISTS_REPLACE will error out. FILE_EXISTS_RENAME
+ * will rename the file until the $destination is unique.
+ * - Adds the new file to the files database. If the source file is a
+ * temporary file, the resulting file will also be a temporary file. See
+ * file_save_upload() for details on temporary files.
+ *
+ * @param $source
+ * A file object.
+ * @param $destination
+ * A string containing the destination that $source should be copied to.
+ * This must be a stream wrapper URI.
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
+ * the destination name exists then its database entry will be updated. If
+ * no database entry is found then a new one will be created.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * File object if the copy is successful, or FALSE in the event of an error.
+ *
+ * @see file_unmanaged_copy()
+ * @see hook_file_copy()
+ */
+function file_copy(stdClass $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ if (!file_valid_uri($destination)) {
+ if (($realpath = drupal_realpath($source->uri)) !== FALSE) {
+ watchdog('file', 'File %file (%realpath) could not be copied, because the destination %destination is invalid. This is often caused by improper use of file_copy() or a missing stream wrapper.', array('%file' => $source->uri, '%realpath' => $realpath, '%destination' => $destination));
+ }
+ else {
+ watchdog('file', 'File %file could not be copied, because the destination %destination is invalid. This is often caused by improper use of file_copy() or a missing stream wrapper.', array('%file' => $source->uri, '%destination' => $destination));
+ }
+ drupal_set_message(t('The specified file %file could not be copied, because the destination is invalid. More information is available in the system log.', array('%file' => $source->uri)), 'error');
+ return FALSE;
+ }
+
+ if ($uri = file_unmanaged_copy($source->uri, $destination, $replace)) {
+ $file = clone $source;
+ $file->fid = NULL;
+ $file->uri = $uri;
+ $file->filename = drupal_basename($uri);
+ // If we are replacing an existing file re-use its database record.
+ if ($replace == FILE_EXISTS_REPLACE) {
+ $existing_files = file_load_multiple(array(), array('uri' => $uri));
+ if (count($existing_files)) {
+ $existing = reset($existing_files);
+ $file->fid = $existing->fid;
+ $file->filename = $existing->filename;
+ }
+ }
+ // If we are renaming around an existing file (rather than a directory),
+ // use its basename for the filename.
+ elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
+ $file->filename = drupal_basename($destination);
+ }
+
+ $file = file_save($file);
+
+ // Inform modules that the file has been copied.
+ module_invoke_all('file_copy', $file, $source);
+
+ return $file;
+ }
+ return FALSE;
+}
+
+/**
+ * Determines whether the URI has a valid scheme for file API operations.
+ *
+ * There must be a scheme and it must be a Drupal-provided scheme like
+ * 'public', 'private', 'temporary', or an extension provided with
+ * hook_stream_wrappers().
+ *
+ * @param $uri
+ * The URI to be tested.
+ *
+ * @return
+ * TRUE if the URI is allowed.
+ */
+function file_valid_uri($uri) {
+ // Assert that the URI has an allowed scheme. Barepaths are not allowed.
+ $uri_scheme = file_uri_scheme($uri);
+ if (empty($uri_scheme) || !file_stream_wrapper_valid_scheme($uri_scheme)) {
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/**
+ * Copies a file to a new location without invoking the file API.
+ *
+ * This is a powerful function that in many ways performs like an advanced
+ * version of copy().
+ * - Checks if $source and $destination are valid and readable/writable.
+ * - If file already exists in $destination either the call will error out,
+ * replace the file or rename the file based on the $replace parameter.
+ * - If the $source and $destination are equal, the behavior depends on the
+ * $replace parameter. FILE_EXISTS_REPLACE will error out. FILE_EXISTS_RENAME
+ * will rename the file until the $destination is unique.
+ * - Provides a fallback using realpaths if the move fails using stream
+ * wrappers. This can occur because PHP's copy() function does not properly
+ * support streams if safe_mode or open_basedir are enabled. See
+ * https://bugs.php.net/bug.php?id=60456
+ *
+ * @param $source
+ * A string specifying the filepath or URI of the source file.
+ * @param $destination
+ * A URI containing the destination that $source should be copied to. The
+ * URI may be a bare filepath (without a scheme). If this value is omitted,
+ * Drupal's default files scheme will be used, usually "public://".
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * The path to the new file, or FALSE in the event of an error.
+ *
+ * @see file_copy()
+ */
+function file_unmanaged_copy($source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ $original_source = $source;
+
+ // Assert that the source file actually exists.
+ if (!file_exists($source)) {
+ // @todo Replace drupal_set_message() calls with exceptions instead.
+ drupal_set_message(t('The specified file %file could not be copied, because no file by that name exists. Please check that you supplied the correct filename.', array('%file' => $original_source)), 'error');
+ if (($realpath = drupal_realpath($original_source)) !== FALSE) {
+ watchdog('file', 'File %file (%realpath) could not be copied because it does not exist.', array('%file' => $original_source, '%realpath' => $realpath));
+ }
+ else {
+ watchdog('file', 'File %file could not be copied because it does not exist.', array('%file' => $original_source));
+ }
+ return FALSE;
+ }
+
+ // Build a destination URI if necessary.
+ if (!isset($destination)) {
+ $destination = file_build_uri(drupal_basename($source));
+ }
+
+
+ // Prepare the destination directory.
+ if (file_prepare_directory($destination)) {
+ // The destination is already a directory, so append the source basename.
+ $destination = file_stream_wrapper_uri_normalize($destination . '/' . drupal_basename($source));
+ }
+ else {
+ // Perhaps $destination is a dir/file?
+ $dirname = drupal_dirname($destination);
+ if (!file_prepare_directory($dirname)) {
+ // The destination is not valid.
+ watchdog('file', 'File %file could not be copied, because the destination directory %destination is not configured correctly.', array('%file' => $original_source, '%destination' => $dirname));
+ drupal_set_message(t('The specified file %file could not be copied, because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.', array('%file' => $original_source)), 'error');
+ return FALSE;
+ }
+ }
+
+ // Determine whether we can perform this operation based on overwrite rules.
+ $destination = file_destination($destination, $replace);
+ if ($destination === FALSE) {
+ drupal_set_message(t('The file %file could not be copied because a file by that name already exists in the destination directory.', array('%file' => $original_source)), 'error');
+ watchdog('file', 'File %file could not be copied because a file by that name already exists in the destination directory (%directory)', array('%file' => $original_source, '%directory' => $destination));
+ return FALSE;
+ }
+
+ // Assert that the source and destination filenames are not the same.
+ $real_source = drupal_realpath($source);
+ $real_destination = drupal_realpath($destination);
+ if ($source == $destination || ($real_source !== FALSE) && ($real_source == $real_destination)) {
+ drupal_set_message(t('The specified file %file was not copied because it would overwrite itself.', array('%file' => $source)), 'error');
+ watchdog('file', 'File %file could not be copied because it would overwrite itself.', array('%file' => $source));
+ return FALSE;
+ }
+ // Make sure the .htaccess files are present.
+ file_ensure_htaccess();
+ // Perform the copy operation.
+ if (!@copy($source, $destination)) {
+ // If the copy failed and realpaths exist, retry the operation using them
+ // instead.
+ if ($real_source === FALSE || $real_destination === FALSE || !@copy($real_source, $real_destination)) {
+ watchdog('file', 'The specified file %file could not be copied to %destination.', array('%file' => $source, '%destination' => $destination), WATCHDOG_ERROR);
+ return FALSE;
+ }
+ }
+
+ // Set the permissions on the new file.
+ drupal_chmod($destination);
+
+ return $destination;
+}
+
+/**
+ * Constructs a URI to Drupal's default files location given a relative path.
+ */
+function file_build_uri($path) {
+ $uri = file_default_scheme() . '://' . $path;
+ return file_stream_wrapper_uri_normalize($uri);
+}
+
+/**
+ * Determines the destination path for a file.
+ *
+ * @param $destination
+ * A string specifying the desired final URI or filepath.
+ * @param $replace
+ * Replace behavior when the destination file already exists.
+ * - FILE_EXISTS_REPLACE - Replace the existing file.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * The destination filepath, or FALSE if the file already exists
+ * and FILE_EXISTS_ERROR is specified.
+ */
+function file_destination($destination, $replace) {
+ if (file_exists($destination)) {
+ switch ($replace) {
+ case FILE_EXISTS_REPLACE:
+ // Do nothing here, we want to overwrite the existing file.
+ break;
+
+ case FILE_EXISTS_RENAME:
+ $basename = drupal_basename($destination);
+ $directory = drupal_dirname($destination);
+ $destination = file_create_filename($basename, $directory);
+ break;
+
+ case FILE_EXISTS_ERROR:
+ // Error reporting handled by calling function.
+ return FALSE;
+ }
+ }
+ return $destination;
+}
+
+/**
+ * Moves a file to a new location and update the file's database entry.
+ *
+ * Moving a file is performed by copying the file to the new location and then
+ * deleting the original.
+ * - Checks if $source and $destination are valid and readable/writable.
+ * - Performs a file move if $source is not equal to $destination.
+ * - If file already exists in $destination either the call will error out,
+ * replace the file or rename the file based on the $replace parameter.
+ * - Adds the new file to the files database.
+ *
+ * @param $source
+ * A file object.
+ * @param $destination
+ * A string containing the destination that $source should be moved to.
+ * This must be a stream wrapper URI.
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
+ * the destination name exists then its database entry will be updated and
+ * file_delete() called on the source file after hook_file_move is called.
+ * If no database entry is found then the source files record will be
+ * updated.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * Resulting file object for success, or FALSE in the event of an error.
+ *
+ * @see file_unmanaged_move()
+ * @see hook_file_move()
+ */
+function file_move(stdClass $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ if (!file_valid_uri($destination)) {
+ if (($realpath = drupal_realpath($source->uri)) !== FALSE) {
+ watchdog('file', 'File %file (%realpath) could not be moved, because the destination %destination is invalid. This may be caused by improper use of file_move() or a missing stream wrapper.', array('%file' => $source->uri, '%realpath' => $realpath, '%destination' => $destination));
+ }
+ else {
+ watchdog('file', 'File %file could not be moved, because the destination %destination is invalid. This may be caused by improper use of file_move() or a missing stream wrapper.', array('%file' => $source->uri, '%destination' => $destination));
+ }
+ drupal_set_message(t('The specified file %file could not be moved, because the destination is invalid. More information is available in the system log.', array('%file' => $source->uri)), 'error');
+ return FALSE;
+ }
+
+ if ($uri = file_unmanaged_move($source->uri, $destination, $replace)) {
+ $delete_source = FALSE;
+
+ $file = clone $source;
+ $file->uri = $uri;
+ // If we are replacing an existing file re-use its database record.
+ if ($replace == FILE_EXISTS_REPLACE) {
+ $existing_files = file_load_multiple(array(), array('uri' => $uri));
+ if (count($existing_files)) {
+ $existing = reset($existing_files);
+ $delete_source = TRUE;
+ $file->fid = $existing->fid;
+ }
+ }
+ // If we are renaming around an existing file (rather than a directory),
+ // use its basename for the filename.
+ elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
+ $file->filename = drupal_basename($destination);
+ }
+
+ $file = file_save($file);
+
+ // Inform modules that the file has been moved.
+ module_invoke_all('file_move', $file, $source);
+
+ if ($delete_source) {
+ // Try a soft delete to remove original if it's not in use elsewhere.
+ file_delete($source);
+ }
+
+ return $file;
+ }
+ return FALSE;
+}
+
+/**
+ * Moves a file to a new location without database changes or hook invocation.
+ *
+ * @param $source
+ * A string specifying the filepath or URI of the original file.
+ * @param $destination
+ * A string containing the destination that $source should be moved to.
+ * This must be a stream wrapper URI. If this value is omitted, Drupal's
+ * default files scheme will be used, usually "public://".
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * The URI of the moved file, or FALSE in the event of an error.
+ *
+ * @see file_move()
+ */
+function file_unmanaged_move($source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ $filepath = file_unmanaged_copy($source, $destination, $replace);
+ if ($filepath == FALSE || file_unmanaged_delete($source) == FALSE) {
+ return FALSE;
+ }
+ return $filepath;
+}
+
+/**
+ * Modifies a filename as needed for security purposes.
+ *
+ * Munging a file name prevents unknown file extensions from masking exploit
+ * files. When web servers such as Apache decide how to process a URL request,
+ * they use the file extension. If the extension is not recognized, Apache
+ * skips that extension and uses the previous file extension. For example, if
+ * the file being requested is exploit.php.pps, and Apache does not recognize
+ * the '.pps' extension, it treats the file as PHP and executes it. To make
+ * this file name safe for Apache and prevent it from executing as PHP, the
+ * .php extension is "munged" into .php_, making the safe file name
+ * exploit.php_.pps.
+ *
+ * Specifically, this function adds an underscore to all extensions that are
+ * between 2 and 5 characters in length, internal to the file name, and not
+ * included in $extensions.
+ *
+ * Function behavior is also controlled by the Drupal variable
+ * 'allow_insecure_uploads'. If 'allow_insecure_uploads' evaluates to TRUE, no
+ * alterations will be made, if it evaluates to FALSE, the filename is 'munged'.
+ *
+ * @param $filename
+ * File name to modify.
+ * @param $extensions
+ * A space-separated list of extensions that should not be altered.
+ * @param $alerts
+ * If TRUE, drupal_set_message() will be called to display a message if the
+ * file name was changed.
+ *
+ * @return
+ * The potentially modified $filename.
+ */
+function file_munge_filename($filename, $extensions, $alerts = TRUE) {
+ $original = $filename;
+
+ // Allow potentially insecure uploads for very savvy users and admin
+ if (!variable_get('allow_insecure_uploads', 0)) {
+ // Remove any null bytes. See http://php.net/manual/security.filesystem.nullbytes.php
+ $filename = str_replace(chr(0), '', $filename);
+
+ $whitelist = array_unique(explode(' ', strtolower(trim($extensions))));
+
+ // Split the filename up by periods. The first part becomes the basename
+ // the last part the final extension.
+ $filename_parts = explode('.', $filename);
+ $new_filename = array_shift($filename_parts); // Remove file basename.
+ $final_extension = array_pop($filename_parts); // Remove final extension.
+
+ // Loop through the middle parts of the name and add an underscore to the
+ // end of each section that could be a file extension but isn't in the list
+ // of allowed extensions.
+ foreach ($filename_parts as $filename_part) {
+ $new_filename .= '.' . $filename_part;
+ if (!in_array(strtolower($filename_part), $whitelist) && preg_match("/^[a-zA-Z]{2,5}\d?$/", $filename_part)) {
+ $new_filename .= '_';
+ }
+ }
+ $filename = $new_filename . '.' . $final_extension;
+
+ if ($alerts && $original != $filename) {
+ drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $filename)));
+ }
+ }
+
+ return $filename;
+}
+
+/**
+ * Undoes the effect of file_munge_filename().
+ *
+ * @param $filename
+ * String with the filename to be unmunged.
+ *
+ * @return
+ * An unmunged filename string.
+ */
+function file_unmunge_filename($filename) {
+ return str_replace('_.', '.', $filename);
+}
+
+/**
+ * Creates a full file path from a directory and filename.
+ *
+ * If a file with the specified name already exists, an alternative will be
+ * used.
+ *
+ * @param $basename
+ * String filename
+ * @param $directory
+ * String containing the directory or parent URI.
+ *
+ * @return
+ * File path consisting of $directory and a unique filename based off
+ * of $basename.
+ */
+function file_create_filename($basename, $directory) {
+ // Strip control characters (ASCII value < 32). Though these are allowed in
+ // some filesystems, not many applications handle them well.
+ $basename = preg_replace('/[\x00-\x1F]/u', '_', $basename);
+ if (substr(PHP_OS, 0, 3) == 'WIN') {
+ // These characters are not allowed in Windows filenames
+ $basename = str_replace(array(':', '*', '?', '"', '<', '>', '|'), '_', $basename);
+ }
+
+ // A URI or path may already have a trailing slash or look like "public://".
+ if (substr($directory, -1) == '/') {
+ $separator = '';
+ }
+ else {
+ $separator = '/';
+ }
+
+ $destination = $directory . $separator . $basename;
+
+ if (file_exists($destination)) {
+ // Destination file already exists, generate an alternative.
+ $pos = strrpos($basename, '.');
+ if ($pos !== FALSE) {
+ $name = substr($basename, 0, $pos);
+ $ext = substr($basename, $pos);
+ }
+ else {
+ $name = $basename;
+ $ext = '';
+ }
+
+ $counter = 0;
+ do {
+ $destination = $directory . $separator . $name . '_' . $counter++ . $ext;
+ } while (file_exists($destination));
+ }
+
+ return $destination;
+}
+
+/**
+ * Deletes a file and its database record.
+ *
+ * If the $force parameter is not TRUE, file_usage_list() will be called to
+ * determine if the file is being used by any modules. If the file is being
+ * used the delete will be canceled.
+ *
+ * @param $file
+ * A file object.
+ * @param $force
+ * Boolean indicating that the file should be deleted even if the file is
+ * reported as in use by the file_usage table.
+ *
+ * @return mixed
+ * TRUE for success, FALSE in the event of an error, or an array if the file
+ * is being used by any modules.
+ *
+ * @see file_unmanaged_delete()
+ * @see file_usage_list()
+ * @see file_usage_delete()
+ * @see hook_file_delete()
+ */
+function file_delete(stdClass $file, $force = FALSE) {
+ if (!file_valid_uri($file->uri)) {
+ if (($realpath = drupal_realpath($file->uri)) !== FALSE) {
+ watchdog('file', 'File %file (%realpath) could not be deleted because it is not a valid URI. This may be caused by improper use of file_delete() or a missing stream wrapper.', array('%file' => $file->uri, '%realpath' => $realpath));
+ }
+ else {
+ watchdog('file', 'File %file could not be deleted because it is not a valid URI. This may be caused by improper use of file_delete() or a missing stream wrapper.', array('%file' => $file->uri));
+ }
+ drupal_set_message(t('The specified file %file could not be deleted, because it is not a valid URI. More information is available in the system log.', array('%file' => $file->uri)), 'error');
+ return FALSE;
+ }
+
+ // If any module still has a usage entry in the file_usage table, the file
+ // will not be deleted, but file_delete() will return a populated array
+ // that tests as TRUE.
+ if (!$force && ($references = file_usage_list($file))) {
+ return $references;
+ }
+
+ // Let other modules clean up any references to the deleted file.
+ module_invoke_all('file_delete', $file);
+ module_invoke_all('entity_delete', $file, 'file');
+
+ // Make sure the file is deleted before removing its row from the
+ // database, so UIs can still find the file in the database.
+ if (file_unmanaged_delete($file->uri)) {
+ db_delete('file_managed')->condition('fid', $file->fid)->execute();
+ db_delete('file_usage')->condition('fid', $file->fid)->execute();
+ entity_get_controller('file')->resetCache();
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
+ * Deletes a file without database changes or hook invocations.
+ *
+ * This function should be used when the file to be deleted does not have an
+ * entry recorded in the files table.
+ *
+ * @param $path
+ * A string containing a file path or (streamwrapper) URI.
+ *
+ * @return
+ * TRUE for success or path does not exist, or FALSE in the event of an
+ * error.
+ *
+ * @see file_delete()
+ * @see file_unmanaged_delete_recursive()
+ */
+function file_unmanaged_delete($path) {
+ if (is_dir($path)) {
+ watchdog('file', '%path is a directory and cannot be removed using file_unmanaged_delete().', array('%path' => $path), WATCHDOG_ERROR);
+ return FALSE;
+ }
+ if (is_file($path)) {
+ return drupal_unlink($path);
+ }
+ // Return TRUE for non-existent file, but log that nothing was actually
+ // deleted, as the current state is the intended result.
+ if (!file_exists($path)) {
+ watchdog('file', 'The file %path was not deleted, because it does not exist.', array('%path' => $path), WATCHDOG_NOTICE);
+ return TRUE;
+ }
+ // We cannot handle anything other than files and directories. Log an error
+ // for everything else (sockets, symbolic links, etc).
+ watchdog('file', 'The file %path is not of a recognized type so it was not deleted.', array('%path' => $path), WATCHDOG_ERROR);
+ return FALSE;
+}
+
+/**
+ * Deletes all files and directories in the specified filepath recursively.
+ *
+ * If the specified path is a directory then the function will call itself
+ * recursively to process the contents. Once the contents have been removed the
+ * directory will also be removed.
+ *
+ * If the specified path is a file then it will be passed to
+ * file_unmanaged_delete().
+ *
+ * Note that this only deletes visible files with write permission.
+ *
+ * @param $path
+ * A string containing either an URI or a file or directory path.
+ *
+ * @return
+ * TRUE for success or if path does not exist, FALSE in the event of an
+ * error.
+ *
+ * @see file_unmanaged_delete()
+ */
+function file_unmanaged_delete_recursive($path) {
+ if (is_dir($path)) {
+ $dir = dir($path);
+ while (($entry = $dir->read()) !== FALSE) {
+ if ($entry == '.' || $entry == '..') {
+ continue;
+ }
+ $entry_path = $path . '/' . $entry;
+ file_unmanaged_delete_recursive($entry_path);
+ }
+ $dir->close();
+
+ return drupal_rmdir($path);
+ }
+ return file_unmanaged_delete($path);
+}
+
+/**
+ * Determines total disk space used by a single user or the whole filesystem.
+ *
+ * @param $uid
+ * Optional. A user id, specifying NULL returns the total space used by all
+ * non-temporary files.
+ * @param $status
+ * Optional. The file status to consider. The default is to only
+ * consider files in status FILE_STATUS_PERMANENT.
+ *
+ * @return
+ * An integer containing the number of bytes used.
+ */
+function file_space_used($uid = NULL, $status = FILE_STATUS_PERMANENT) {
+ $query = db_select('file_managed', 'f');
+ $query->condition('f.status', $status);
+ $query->addExpression('SUM(f.filesize)', 'filesize');
+ if (isset($uid)) {
+ $query->condition('f.uid', $uid);
+ }
+ return $query->execute()->fetchField();
+}
+
+/**
+ * Saves a file upload to a new location.
+ *
+ * The file will be added to the {file_managed} table as a temporary file.
+ * Temporary files are periodically cleaned. To make the file a permanent file,
+ * assign the status and use file_save() to save the changes.
+ *
+ * @param $form_field_name
+ * A string that is the associative array key of the upload form element in
+ * the form array.
+ * @param $validators
+ * An optional, associative array of callback functions used to validate the
+ * file. See file_validate() for a full discussion of the array format.
+ * If no extension validator is provided it will default to a limited safe
+ * list of extensions which is as follows: "jpg jpeg gif png txt
+ * doc xls pdf ppt pps odt ods odp". To allow all extensions you must
+ * explicitly set the 'file_validate_extensions' validator to an empty array
+ * (Beware: this is not safe and should only be allowed for trusted users, if
+ * at all).
+ * @param $destination
+ * A string containing the URI that the file should be copied to. This must
+ * be a stream wrapper URI. If this value is omitted, Drupal's temporary
+ * files scheme will be used ("temporary://").
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE: Replace the existing file.
+ * - FILE_EXISTS_RENAME: Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR: Do nothing and return FALSE.
+ *
+ * @return
+ * An object containing the file information if the upload succeeded, FALSE
+ * in the event of an error, or NULL if no file was uploaded. The
+ * documentation for the "File interface" group, which you can find under
+ * Related topics, or the header at the top of this file, documents the
+ * components of a file object. In addition to the standard components,
+ * this function adds:
+ * - source: Path to the file before it is moved.
+ * - destination: Path to the file after it is moved (same as 'uri').
+ */
+function file_save_upload($form_field_name, $validators = array(), $destination = FALSE, $replace = FILE_EXISTS_RENAME) {
+ global $user;
+ static $upload_cache;
+
+ // Return cached objects without processing since the file will have
+ // already been processed and the paths in _FILES will be invalid.
+ if (isset($upload_cache[$form_field_name])) {
+ return $upload_cache[$form_field_name];
+ }
+
+ // Make sure there's an upload to process.
+ if (empty($_FILES['files']['name'][$form_field_name])) {
+ return NULL;
+ }
+
+ // Check for file upload errors and return FALSE if a lower level system
+ // error occurred. For a complete list of errors:
+ // See http://php.net/manual/features.file-upload.errors.php.
+ switch ($_FILES['files']['error'][$form_field_name]) {
+ case UPLOAD_ERR_INI_SIZE:
+ case UPLOAD_ERR_FORM_SIZE:
+ drupal_set_message(t('The file %file could not be saved, because it exceeds %maxsize, the maximum allowed size for uploads.', array('%file' => $_FILES['files']['name'][$form_field_name], '%maxsize' => format_size(file_upload_max_size()))), 'error');
+ return FALSE;
+
+ case UPLOAD_ERR_PARTIAL:
+ case UPLOAD_ERR_NO_FILE:
+ drupal_set_message(t('The file %file could not be saved, because the upload did not complete.', array('%file' => $_FILES['files']['name'][$form_field_name])), 'error');
+ return FALSE;
+
+ case UPLOAD_ERR_OK:
+ // Final check that this is a valid upload, if it isn't, use the
+ // default error handler.
+ if (is_uploaded_file($_FILES['files']['tmp_name'][$form_field_name])) {
+ break;
+ }
+
+ // Unknown error
+ default:
+ drupal_set_message(t('The file %file could not be saved. An unknown error has occurred.', array('%file' => $_FILES['files']['name'][$form_field_name])), 'error');
+ return FALSE;
+ }
+
+ // Begin building file object.
+ $file = new stdClass();
+ $file->uid = $user->uid;
+ $file->status = 0;
+ $file->filename = trim(drupal_basename($_FILES['files']['name'][$form_field_name]), '.');
+ $file->uri = $_FILES['files']['tmp_name'][$form_field_name];
+ $file->filemime = file_get_mimetype($file->filename);
+ $file->filesize = $_FILES['files']['size'][$form_field_name];
+
+ $extensions = '';
+ if (isset($validators['file_validate_extensions'])) {
+ if (isset($validators['file_validate_extensions'][0])) {
+ // Build the list of non-munged extensions if the caller provided them.
+ $extensions = $validators['file_validate_extensions'][0];
+ }
+ else {
+ // If 'file_validate_extensions' is set and the list is empty then the
+ // caller wants to allow any extension. In this case we have to remove the
+ // validator or else it will reject all extensions.
+ unset($validators['file_validate_extensions']);
+ }
+ }
+ else {
+ // No validator was provided, so add one using the default list.
+ // Build a default non-munged safe list for file_munge_filename().
+ $extensions = 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp';
+ $validators['file_validate_extensions'] = array();
+ $validators['file_validate_extensions'][0] = $extensions;
+ }
+
+ if (!empty($extensions)) {
+ // Munge the filename to protect against possible malicious extension hiding
+ // within an unknown file type (ie: filename.html.foo).
+ $file->filename = file_munge_filename($file->filename, $extensions);
+ }
+
+ // Rename potentially executable files, to help prevent exploits (i.e. will
+ // rename filename.php.foo and filename.php to filename.php.foo.txt and
+ // filename.php.txt, respectively). Don't rename if 'allow_insecure_uploads'
+ // evaluates to TRUE.
+ if (!variable_get('allow_insecure_uploads', 0) && preg_match('/\.(php|pl|py|cgi|asp|js)(\.|$)/i', $file->filename) && (substr($file->filename, -4) != '.txt')) {
+ $file->filemime = 'text/plain';
+ $file->uri .= '.txt';
+ $file->filename .= '.txt';
+ // The .txt extension may not be in the allowed list of extensions. We have
+ // to add it here or else the file upload will fail.
+ if (!empty($extensions)) {
+ $validators['file_validate_extensions'][0] .= ' txt';
+ drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $file->filename)));
+ }
+ }
+
+ // If the destination is not provided, use the temporary directory.
+ if (empty($destination)) {
+ $destination = 'temporary://';
+ }
+
+ // Assert that the destination contains a valid stream.
+ $destination_scheme = file_uri_scheme($destination);
+ if (!$destination_scheme || !file_stream_wrapper_valid_scheme($destination_scheme)) {
+ drupal_set_message(t('The file could not be uploaded, because the destination %destination is invalid.', array('%destination' => $destination)), 'error');
+ return FALSE;
+ }
+
+ $file->source = $form_field_name;
+ // A URI may already have a trailing slash or look like "public://".
+ if (substr($destination, -1) != '/') {
+ $destination .= '/';
+ }
+ $file->destination = file_destination($destination . $file->filename, $replace);
+ // If file_destination() returns FALSE then $replace == FILE_EXISTS_ERROR and
+ // there's an existing file so we need to bail.
+ if ($file->destination === FALSE) {
+ drupal_set_message(t('The file %source could not be uploaded because a file by that name already exists in the destination %directory.', array('%source' => $form_field_name, '%directory' => $destination)), 'error');
+ return FALSE;
+ }
+
+ // Add in our check of the file name length.
+ $validators['file_validate_name_length'] = array();
+
+ // Call the validation functions specified by this function's caller.
+ $errors = file_validate($file, $validators);
+
+ // Check for errors.
+ if (!empty($errors)) {
+ $message = t('The specified file %name could not be uploaded.', array('%name' => $file->filename));
+ if (count($errors) > 1) {
+ $message .= theme('item_list', array('items' => $errors));
+ }
+ else {
+ $message .= ' ' . array_pop($errors);
+ }
+ form_set_error($form_field_name, $message);
+ return FALSE;
+ }
+
+ // Move uploaded files from PHP's upload_tmp_dir to Drupal's temporary
+ // directory. This overcomes open_basedir restrictions for future file
+ // operations.
+ $file->uri = $file->destination;
+ if (!drupal_move_uploaded_file($_FILES['files']['tmp_name'][$form_field_name], $file->uri)) {
+ form_set_error($form_field_name, t('File upload error. Could not move uploaded file.'));
+ watchdog('file', 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->uri));
+ return FALSE;
+ }
+
+ // Set the permissions on the new file.
+ drupal_chmod($file->uri);
+
+ // If we are replacing an existing file re-use its database record.
+ if ($replace == FILE_EXISTS_REPLACE) {
+ $existing_files = file_load_multiple(array(), array('uri' => $file->uri));
+ if (count($existing_files)) {
+ $existing = reset($existing_files);
+ $file->fid = $existing->fid;
+ }
+ }
+
+ // If we made it this far it's safe to record this file in the database.
+ if ($file = file_save($file)) {
+ // Track non-public files in the session if they were uploaded by an
+ // anonymous user. This allows modules such as the File module to only
+ // grant view access to the specific anonymous user who uploaded the file.
+ // See file_file_download().
+ // The 'file_public_schema' variable is used to allow other publicly
+ // accessible file schemes to be treated the same as the public:// scheme
+ // provided by Drupal core and to avoid adding unnecessary data to the
+ // session (and the resulting bypass of the page cache) in those cases. For
+ // security reasons, only schemes that are completely publicly accessible,
+ // with no download restrictions, should be added to this variable. See
+ // file_managed_file_value().
+ if (!$user->uid && !in_array($destination_scheme, variable_get('file_public_schema', array('public')))) {
+ $_SESSION['anonymous_allowed_file_ids'][$file->fid] = $file->fid;
+ }
+ // Add file to the cache.
+ $upload_cache[$form_field_name] = $file;
+ return $file;
+ }
+ return FALSE;
+}
+
+/**
+ * Moves an uploaded file to a new location.
+ *
+ * PHP's move_uploaded_file() does not properly support streams if safe_mode
+ * or open_basedir are enabled, so this function fills that gap.
+ *
+ * Compatibility: normal paths and stream wrappers.
+ *
+ * @param $filename
+ * The filename of the uploaded file.
+ * @param $uri
+ * A string containing the destination URI of the file.
+ *
+ * @return
+ * TRUE on success, or FALSE on failure.
+ *
+ * @see move_uploaded_file()
+ * @see http://drupal.org/node/515192
+ * @ingroup php_wrappers
+ */
+function drupal_move_uploaded_file($filename, $uri) {
+ $result = @move_uploaded_file($filename, $uri);
+ // PHP's move_uploaded_file() does not properly support streams if safe_mode
+ // or open_basedir are enabled so if the move failed, try finding a real path
+ // and retry the move operation.
+ if (!$result) {
+ if ($realpath = drupal_realpath($uri)) {
+ $result = move_uploaded_file($filename, $realpath);
+ }
+ else {
+ $result = move_uploaded_file($filename, $uri);
+ }
+ }
+
+ return $result;
+}
+
+/**
+ * Checks that a file meets the criteria specified by the validators.
+ *
+ * After executing the validator callbacks specified hook_file_validate() will
+ * also be called to allow other modules to report errors about the file.
+ *
+ * @param $file
+ * A Drupal file object.
+ * @param $validators
+ * An optional, associative array of callback functions used to validate the
+ * file. The keys are function names and the values arrays of callback
+ * parameters which will be passed in after the file object. The
+ * functions should return an array of error messages; an empty array
+ * indicates that the file passed validation. The functions will be called in
+ * the order specified.
+ *
+ * @return
+ * An array containing validation error messages.
+ *
+ * @see hook_file_validate()
+ */
+function file_validate(stdClass &$file, $validators = array()) {
+ // Call the validation functions specified by this function's caller.
+ $errors = array();
+ foreach ($validators as $function => $args) {
+ if (function_exists($function)) {
+ array_unshift($args, $file);
+ $errors = array_merge($errors, call_user_func_array($function, $args));
+ }
+ }
+
+ // Let other modules perform validation on the new file.
+ return array_merge($errors, module_invoke_all('file_validate', $file));
+}
+
+/**
+ * Checks for files with names longer than we can store in the database.
+ *
+ * @param $file
+ * A Drupal file object.
+ *
+ * @return
+ * An array. If the file name is too long, it will contain an error message.
+ */
+function file_validate_name_length(stdClass $file) {
+ $errors = array();
+
+ if (empty($file->filename)) {
+ $errors[] = t("The file's name is empty. Please give a name to the file.");
+ }
+ if (strlen($file->filename) > 240) {
+ $errors[] = t("The file's name exceeds the 240 characters limit. Please rename the file and try again.");
+ }
+ return $errors;
+}
+
+/**
+ * Checks that the filename ends with an allowed extension.
+ *
+ * @param $file
+ * A Drupal file object.
+ * @param $extensions
+ * A string with a space separated list of allowed extensions.
+ *
+ * @return
+ * An array. If the file extension is not allowed, it will contain an error
+ * message.
+ *
+ * @see hook_file_validate()
+ */
+function file_validate_extensions(stdClass $file, $extensions) {
+ $errors = array();
+
+ $regex = '/\.(' . preg_replace('/ +/', '|', preg_quote($extensions)) . ')$/i';
+ if (!preg_match($regex, $file->filename)) {
+ $errors[] = t('Only files with the following extensions are allowed: %files-allowed.', array('%files-allowed' => $extensions));
+ }
+ return $errors;
+}
+
+/**
+ * Checks that the file's size is below certain limits.
+ *
+ * @param $file
+ * A Drupal file object.
+ * @param $file_limit
+ * An integer specifying the maximum file size in bytes. Zero indicates that
+ * no limit should be enforced.
+ * @param $user_limit
+ * An integer specifying the maximum number of bytes the user is allowed.
+ * Zero indicates that no limit should be enforced.
+ *
+ * @return
+ * An array. If the file size exceeds limits, it will contain an error
+ * message.
+ *
+ * @see hook_file_validate()
+ */
+function file_validate_size(stdClass $file, $file_limit = 0, $user_limit = 0) {
+ global $user;
+ $errors = array();
+
+ if ($file_limit && $file->filesize > $file_limit) {
+ $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->filesize), '%maxsize' => format_size($file_limit)));
+ }
+
+ // Save a query by only calling file_space_used() when a limit is provided.
+ if ($user_limit && (file_space_used($user->uid) + $file->filesize) > $user_limit) {
+ $errors[] = t('The file is %filesize which would exceed your disk quota of %quota.', array('%filesize' => format_size($file->filesize), '%quota' => format_size($user_limit)));
+ }
+
+ return $errors;
+}
+
+/**
+ * Checks that the file is recognized by image_get_info() as an image.
+ *
+ * @param $file
+ * A Drupal file object.
+ *
+ * @return
+ * An array. If the file is not an image, it will contain an error message.
+ *
+ * @see hook_file_validate()
+ */
+function file_validate_is_image(stdClass $file) {
+ $errors = array();
+
+ $info = image_get_info($file->uri);
+ if (!$info || empty($info['extension'])) {
+ $errors[] = t('Only JPEG, PNG and GIF images are allowed.');
+ }
+
+ return $errors;
+}
+
+/**
+ * Verifies that image dimensions are within the specified maximum and minimum.
+ *
+ * Non-image files will be ignored. If an image toolkit is available the image
+ * will be scaled to fit within the desired maximum dimensions.
+ *
+ * @param $file
+ * A Drupal file object. This function may resize the file affecting its
+ * size.
+ * @param $maximum_dimensions
+ * An optional string in the form WIDTHxHEIGHT e.g. '640x480' or '85x85'. If
+ * an image toolkit is installed the image will be resized down to these
+ * dimensions. A value of 0 indicates no restriction on size, so resizing
+ * will be attempted.
+ * @param $minimum_dimensions
+ * An optional string in the form WIDTHxHEIGHT. This will check that the
+ * image meets a minimum size. A value of 0 indicates no restriction.
+ *
+ * @return
+ * An array. If the file is an image and did not meet the requirements, it
+ * will contain an error message.
+ *
+ * @see hook_file_validate()
+ */
+function file_validate_image_resolution(stdClass $file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
+ $errors = array();
+
+ // Check first that the file is an image.
+ if ($info = image_get_info($file->uri)) {
+ if ($maximum_dimensions) {
+ // Check that it is smaller than the given dimensions.
+ list($width, $height) = explode('x', $maximum_dimensions);
+ if ($info['width'] > $width || $info['height'] > $height) {
+ // Try to resize the image to fit the dimensions.
+ if ($image = image_load($file->uri)) {
+ image_scale($image, $width, $height);
+ image_save($image);
+ $file->filesize = $image->info['file_size'];
+ drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));
+ }
+ else {
+ $errors[] = t('The image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => $maximum_dimensions));
+ }
+ }
+ }
+
+ if ($minimum_dimensions) {
+ // Check that it is larger than the given dimensions.
+ list($width, $height) = explode('x', $minimum_dimensions);
+ if ($info['width'] < $width || $info['height'] < $height) {
+ $errors[] = t('The image is too small; the minimum dimensions are %dimensions pixels.', array('%dimensions' => $minimum_dimensions));
+ }
+ }
+ }
+
+ return $errors;
+}
+
+/**
+ * Saves a file to the specified destination and creates a database entry.
+ *
+ * @param $data
+ * A string containing the contents of the file.
+ * @param $destination
+ * A string containing the destination URI. This must be a stream wrapper URI.
+ * If no value is provided, a randomized name will be generated and the file
+ * will be saved using Drupal's default files scheme, usually "public://".
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
+ * the destination name exists then its database entry will be updated. If
+ * no database entry is found then a new one will be created.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * A file object, or FALSE on error.
+ *
+ * @see file_unmanaged_save_data()
+ */
+function file_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ global $user;
+
+ if (empty($destination)) {
+ $destination = file_default_scheme() . '://';
+ }
+ if (!file_valid_uri($destination)) {
+ watchdog('file', 'The data could not be saved because the destination %destination is invalid. This may be caused by improper use of file_save_data() or a missing stream wrapper.', array('%destination' => $destination));
+ drupal_set_message(t('The data could not be saved, because the destination is invalid. More information is available in the system log.'), 'error');
+ return FALSE;
+ }
+
+ if ($uri = file_unmanaged_save_data($data, $destination, $replace)) {
+ // Create a file object.
+ $file = new stdClass();
+ $file->fid = NULL;
+ $file->uri = $uri;
+ $file->filename = drupal_basename($uri);
+ $file->filemime = file_get_mimetype($file->uri);
+ $file->uid = $user->uid;
+ $file->status = FILE_STATUS_PERMANENT;
+ // If we are replacing an existing file re-use its database record.
+ if ($replace == FILE_EXISTS_REPLACE) {
+ $existing_files = file_load_multiple(array(), array('uri' => $uri));
+ if (count($existing_files)) {
+ $existing = reset($existing_files);
+ $file->fid = $existing->fid;
+ $file->filename = $existing->filename;
+ }
+ }
+ // If we are renaming around an existing file (rather than a directory),
+ // use its basename for the filename.
+ elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
+ $file->filename = drupal_basename($destination);
+ }
+
+ return file_save($file);
+ }
+ return FALSE;
+}
+
+/**
+ * Saves a string to the specified destination without invoking file API.
+ *
+ * This function is identical to file_save_data() except the file will not be
+ * saved to the {file_managed} table and none of the file_* hooks will be
+ * called.
+ *
+ * @param $data
+ * A string containing the contents of the file.
+ * @param $destination
+ * A string containing the destination location. This must be a stream wrapper
+ * URI. If no value is provided, a randomized name will be generated and the
+ * file will be saved using Drupal's default files scheme, usually
+ * "public://".
+ * @param $replace
+ * Replace behavior when the destination file already exists:
+ * - FILE_EXISTS_REPLACE - Replace the existing file.
+ * - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
+ * unique.
+ * - FILE_EXISTS_ERROR - Do nothing and return FALSE.
+ *
+ * @return
+ * A string with the path of the resulting file, or FALSE on error.
+ *
+ * @see file_save_data()
+ */
+function file_unmanaged_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
+ // Write the data to a temporary file.
+ $temp_name = drupal_tempnam('temporary://', 'file');
+ if (file_put_contents($temp_name, $data) === FALSE) {
+ drupal_set_message(t('The file could not be created.'), 'error');
+ return FALSE;
+ }
+
+ // Move the file to its final destination.
+ return file_unmanaged_move($temp_name, $destination, $replace);
+}
+
+/**
+ * Transfers a file to the client using HTTP.
+ *
+ * Pipes a file through Drupal to the client.
+ *
+ * @param $uri
+ * String specifying the file URI to transfer.
+ * @param $headers
+ * An array of HTTP headers to send along with file.
+ */
+function file_transfer($uri, $headers) {
+ if (ob_get_level()) {
+ ob_end_clean();
+ }
+
+ foreach ($headers as $name => $value) {
+ drupal_add_http_header($name, $value);
+ }
+ drupal_send_headers();
+ $scheme = file_uri_scheme($uri);
+ // Transfer file in 1024 byte chunks to save memory usage.
+ if ($scheme && file_stream_wrapper_valid_scheme($scheme) && $fd = fopen($uri, 'rb')) {
+ while (!feof($fd)) {
+ print fread($fd, 1024);
+ }
+ fclose($fd);
+ }
+ else {
+ drupal_not_found();
+ }
+ drupal_exit();
+}
+
+/**
+ * Menu handler for private file transfers.
+ *
+ * Call modules that implement hook_file_download() to find out if a file is
+ * accessible and what headers it should be transferred with. If one or more
+ * modules returned headers the download will start with the returned headers.
+ * If a module returns -1 drupal_access_denied() will be returned. If the file
+ * exists but no modules responded drupal_access_denied() will be returned.
+ * If the file does not exist drupal_not_found() will be returned.
+ *
+ * @see system_menu()
+ */
+function file_download() {
+ // Merge remainder of arguments from GET['q'], into relative file path.
+ $args = func_get_args();
+ $scheme = array_shift($args);
+ $target = implode('/', $args);
+ $uri = $scheme . '://' . $target;
+ if (file_stream_wrapper_valid_scheme($scheme) && file_exists($uri)) {
+ $headers = file_download_headers($uri);
+ if (count($headers)) {
+ file_transfer($uri, $headers);
+ }
+ drupal_access_denied();
+ }
+ else {
+ drupal_not_found();
+ }
+ drupal_exit();
+}
+
+/**
+ * Retrieves headers for a private file download.
+ *
+ * Calls all module implementations of hook_file_download() to retrieve headers
+ * for files by the module that originally provided the file. The presence of
+ * returned headers indicates the current user has access to the file.
+ *
+ * @param $uri
+ * The URI for the file whose headers should be retrieved.
+ *
+ * @return
+ * If access is allowed, headers for the file, suitable for passing to
+ * file_transfer(). If access is not allowed, an empty array will be returned.
+ *
+ * @see file_transfer()
+ * @see file_download_access()
+ * @see hook_file_download()
+ */
+function file_download_headers($uri) {
+ // Let other modules provide headers and control access to the file.
+ // module_invoke_all() uses array_merge_recursive() which merges header
+ // values into a new array. To avoid that and allow modules to override
+ // headers instead, use array_merge() to merge the returned arrays.
+ $headers = array();
+ foreach (module_implements('file_download') as $module) {
+ $function = $module . '_file_download';
+ $result = $function($uri);
+ if ($result == -1) {
+ // Throw away the headers received so far.
+ $headers = array();
+ break;
+ }
+ if (isset($result) && is_array($result)) {
+ $headers = array_merge($headers, $result);
+ }
+ }
+ return $headers;
+}
+
+/**
+ * Checks that the current user has access to a particular file.
+ *
+ * The return value of this function hinges on the return value from
+ * file_download_headers(), which is the function responsible for collecting
+ * access information through hook_file_download().
+ *
+ * If immediately transferring the file to the browser and the headers will
+ * need to be retrieved, the return value of file_download_headers() should be
+ * used to determine access directly, so that access checks will not be run
+ * twice.
+ *
+ * @param $uri
+ * The URI for the file whose access should be retrieved.
+ *
+ * @return
+ * Boolean TRUE if access is allowed. FALSE if access is not allowed.
+ *
+ * @see file_download_headers()
+ * @see hook_file_download()
+ */
+function file_download_access($uri) {
+ return count(file_download_headers($uri)) > 0;
+}
+
+/**
+ * Finds all files that match a given mask in a given directory.
+ *
+ * Directories and files beginning with a period are excluded; this
+ * prevents hidden files and directories (such as SVN working directories)
+ * from being scanned.
+ *
+ * @param $dir
+ * The base directory or URI to scan, without trailing slash.
+ * @param $mask
+ * The preg_match() regular expression of the files to find.
+ * @param $options
+ * An associative array of additional options, with the following elements:
+ * - 'nomask': The preg_match() regular expression of the files to ignore.
+ * Defaults to '/(\.\.?|CVS)$/'.
+ * - 'callback': The callback function to call for each match. There is no
+ * default callback.
+ * - 'recurse': When TRUE, the directory scan will recurse the entire tree
+ * starting at the provided directory. Defaults to TRUE.
+ * - 'key': The key to be used for the returned associative array of files.
+ * Possible values are 'uri', for the file's URI; 'filename', for the
+ * basename of the file; and 'name' for the name of the file without the
+ * extension. Defaults to 'uri'.
+ * - 'min_depth': Minimum depth of directories to return files from. Defaults
+ * to 0.
+ * @param $depth
+ * Current depth of recursion. This parameter is only used internally and
+ * should not be passed in.
+ *
+ * @return
+ * An associative array (keyed on the chosen key) of objects with 'uri',
+ * 'filename', and 'name' members corresponding to the matching files.
+ */
+function file_scan_directory($dir, $mask, $options = array(), $depth = 0) {
+ // Merge in defaults.
+ $options += array(
+ 'nomask' => '/(\.\.?|CVS)$/',
+ 'callback' => 0,
+ 'recurse' => TRUE,
+ 'key' => 'uri',
+ 'min_depth' => 0,
+ );
+
+ $options['key'] = in_array($options['key'], array('uri', 'filename', 'name')) ? $options['key'] : 'uri';
+ $files = array();
+ if (is_dir($dir) && $handle = opendir($dir)) {
+ while (FALSE !== ($filename = readdir($handle))) {
+ if (!preg_match($options['nomask'], $filename) && $filename[0] != '.') {
+ $uri = "$dir/$filename";
+ $uri = file_stream_wrapper_uri_normalize($uri);
+ if (is_dir($uri) && $options['recurse']) {
+ // Give priority to files in this folder by merging them in after any subdirectory files.
+ $files = array_merge(file_scan_directory($uri, $mask, $options, $depth + 1), $files);
+ }
+ elseif ($depth >= $options['min_depth'] && preg_match($mask, $filename)) {
+ // Always use this match over anything already set in $files with the
+ // same $$options['key'].
+ $file = new stdClass();
+ $file->uri = $uri;
+ $file->filename = $filename;
+ $file->name = pathinfo($filename, PATHINFO_FILENAME);
+ $key = $options['key'];
+ $files[$file->$key] = $file;
+ if ($options['callback']) {
+ $options['callback']($uri);
+ }
+ }
+ }
+ }
+
+ closedir($handle);
+ }
+
+ return $files;
+}
+
+/**
+ * Determines the maximum file upload size by querying the PHP settings.
+ *
+ * @return
+ * A file size limit in bytes based on the PHP upload_max_filesize and
+ * post_max_size
+ */
+function file_upload_max_size() {
+ static $max_size = -1;
+
+ if ($max_size < 0) {
+ // Start with post_max_size.
+ $max_size = parse_size(ini_get('post_max_size'));
+
+ // If upload_max_size is less, then reduce. Except if upload_max_size is
+ // zero, which indicates no limit.
+ $upload_max = parse_size(ini_get('upload_max_filesize'));
+ if ($upload_max > 0 && $upload_max < $max_size) {
+ $max_size = $upload_max;
+ }
+ }
+ return $max_size;
+}
+
+/**
+ * Determines an Internet Media Type or MIME type from a filename.
+ *
+ * @param $uri
+ * A string containing the URI, path, or filename.
+ * @param $mapping
+ * An optional map of extensions to their mimetypes, in the form:
+ * - 'mimetypes': a list of mimetypes, keyed by an identifier,
+ * - 'extensions': the mapping itself, an associative array in which
+ * the key is the extension (lowercase) and the value is the mimetype
+ * identifier. If $mapping is NULL file_mimetype_mapping() is called.
+ *
+ * @return
+ * The internet media type registered for the extension or
+ * application/octet-stream for unknown extensions.
+ *
+ * @see file_default_mimetype_mapping()
+ */
+function file_get_mimetype($uri, $mapping = NULL) {
+ if ($wrapper = file_stream_wrapper_get_instance_by_uri($uri)) {
+ return $wrapper->getMimeType($uri, $mapping);
+ }
+ else {
+ // getMimeType() is not implementation specific, so we can directly
+ // call it without an instance.
+ return DrupalLocalStreamWrapper::getMimeType($uri, $mapping);
+ }
+}
+
+/**
+ * Sets the permissions on a file or directory.
+ *
+ * This function will use the 'file_chmod_directory' and 'file_chmod_file'
+ * variables for the default modes for directories and uploaded/generated
+ * files. By default these will give everyone read access so that users
+ * accessing the files with a user account without the webserver group (e.g.
+ * via FTP) can read these files, and give group write permissions so webserver
+ * group members (e.g. a vhost account) can alter files uploaded and owned by
+ * the webserver.
+ *
+ * PHP's chmod does not support stream wrappers so we use our wrapper
+ * implementation which interfaces with chmod() by default. Contrib wrappers
+ * may override this behavior in their implementations as needed.
+ *
+ * @param $uri
+ * A string containing a URI file, or directory path.
+ * @param $mode
+ * Integer value for the permissions. Consult PHP chmod() documentation for
+ * more information.
+ *
+ * @return
+ * TRUE for success, FALSE in the event of an error.
+ *
+ * @ingroup php_wrappers
+ */
+function drupal_chmod($uri, $mode = NULL) {
+ if (!isset($mode)) {
+ if (is_dir($uri)) {
+ $mode = variable_get('file_chmod_directory', 0775);
+ }
+ else {
+ $mode = variable_get('file_chmod_file', 0664);
+ }
+ }
+
+ // If this URI is a stream, pass it off to the appropriate stream wrapper.
+ // Otherwise, attempt PHP's chmod. This allows use of drupal_chmod even
+ // for unmanaged files outside of the stream wrapper interface.
+ if ($wrapper = file_stream_wrapper_get_instance_by_uri($uri)) {
+ if ($wrapper->chmod($mode)) {
+ return TRUE;
+ }
+ }
+ else {
+ if (@chmod($uri, $mode)) {
+ return TRUE;
+ }
+ }
+
+ watchdog('file', 'The file permissions could not be set on %uri.', array('%uri' => $uri), WATCHDOG_ERROR);
+ return FALSE;
+}
+
+/**
+ * Deletes a file.
+ *
+ * PHP's unlink() is broken on Windows, as it can fail to remove a file
+ * when it has a read-only flag set.
+ *
+ * @param $uri
+ * A URI or pathname.
+ * @param $context
+ * Refer to http://php.net/manual/ref.stream.php
+ *
+ * @return
+ * Boolean TRUE on success, or FALSE on failure.
+ *
+ * @see unlink()
+ * @ingroup php_wrappers
+ */
+function drupal_unlink($uri, $context = NULL) {
+ $scheme = file_uri_scheme($uri);
+ if ((!$scheme || !file_stream_wrapper_valid_scheme($scheme)) && (substr(PHP_OS, 0, 3) == 'WIN')) {
+ chmod($uri, 0600);
+ }
+ if ($context) {
+ return unlink($uri, $context);
+ }
+ else {
+ return unlink($uri);
+ }
+}
+
+/**
+ * Resolves the absolute filepath of a local URI or filepath.
+ *
+ * The use of drupal_realpath() is discouraged, because it does not work for
+ * remote URIs. Except in rare cases, URIs should not be manually resolved.
+ *
+ * Only use this function if you know that the stream wrapper in the URI uses
+ * the local file system, and you need to pass an absolute path to a function
+ * that is incompatible with stream URIs.
+ *
+ * @param string $uri
+ * A stream wrapper URI or a filepath, possibly including one or more symbolic
+ * links.
+ *
+ * @return string|false
+ * The absolute local filepath (with no symbolic links), or FALSE on failure.
+ *
+ * @see DrupalStreamWrapperInterface::realpath()
+ * @see http://php.net/manual/function.realpath.php
+ * @ingroup php_wrappers
+ */
+function drupal_realpath($uri) {
+ // If this URI is a stream, pass it off to the appropriate stream wrapper.
+ // Otherwise, attempt PHP's realpath. This allows use of drupal_realpath even
+ // for unmanaged files outside of the stream wrapper interface.
+ if ($wrapper = file_stream_wrapper_get_instance_by_uri($uri)) {
+ return $wrapper->realpath();
+ }
+ // Check that the URI has a value. There is a bug in PHP 5.2 on *BSD systems
+ // that makes realpath not return FALSE as expected when passing an empty
+ // variable.
+ // @todo Remove when Drupal drops support for PHP 5.2.
+ elseif (!empty($uri)) {
+ return realpath($uri);
+ }
+ return FALSE;
+}
+
+/**
+ * Gets the name of the directory from a given path.
+ *
+ * PHP's dirname() does not properly pass streams, so this function fills
+ * that gap. It is backwards compatible with normal paths and will use
+ * PHP's dirname() as a fallback.
+ *
+ * Compatibility: normal paths and stream wrappers.
+ *
+ * @param $uri
+ * A URI or path.
+ *
+ * @return
+ * A string containing the directory name.
+ *
+ * @see dirname()
+ * @see http://drupal.org/node/515192
+ * @ingroup php_wrappers
+ */
+function drupal_dirname($uri) {
+ $scheme = file_uri_scheme($uri);
+
+ if ($scheme && file_stream_wrapper_valid_scheme($scheme)) {
+ return file_stream_wrapper_get_instance_by_scheme($scheme)->dirname($uri);
+ }
+ else {
+ return dirname($uri);
+ }
+}
+
+/**
+ * Gets the filename from a given path.
+ *
+ * PHP's basename() does not properly support streams or filenames beginning
+ * with a non-US-ASCII character.
+ *
+ * @see http://bugs.php.net/bug.php?id=37738
+ * @see basename()
+ *
+ * @ingroup php_wrappers
+ */
+function drupal_basename($uri, $suffix = NULL) {
+ $separators = '/';
+ if (DIRECTORY_SEPARATOR != '/') {
+ // For Windows OS add special separator.
+ $separators .= DIRECTORY_SEPARATOR;
+ }
+ // Remove right-most slashes when $uri points to directory.
+ $uri = rtrim($uri, $separators);
+ // Returns the trailing part of the $uri starting after one of the directory
+ // separators.
+ $filename = preg_match('@[^' . preg_quote($separators, '@') . ']+$@', $uri, $matches) ? $matches[0] : '';
+ // Cuts off a suffix from the filename.
+ if ($suffix) {
+ $filename = preg_replace('@' . preg_quote($suffix, '@') . '$@', '', $filename);
+ }
+ return $filename;
+}
+
+/**
+ * Creates a directory using Drupal's default mode.
+ *
+ * PHP's mkdir() does not respect Drupal's default permissions mode. If a mode
+ * is not provided, this function will make sure that Drupal's is used.
+ *
+ * Compatibility: normal paths and stream wrappers.
+ *
+ * @param $uri
+ * A URI or pathname.
+ * @param $mode
+ * By default the Drupal mode is used.
+ * @param $recursive
+ * Default to FALSE.
+ * @param $context
+ * Refer to http://php.net/manual/ref.stream.php
+ *
+ * @return
+ * Boolean TRUE on success, or FALSE on failure.
+ *
+ * @see mkdir()
+ * @see http://drupal.org/node/515192
+ * @ingroup php_wrappers
+ */
+function drupal_mkdir($uri, $mode = NULL, $recursive = FALSE, $context = NULL) {
+ if (!isset($mode)) {
+ $mode = variable_get('file_chmod_directory', 0775);
+ }
+
+ if (!isset($context)) {
+ return mkdir($uri, $mode, $recursive);
+ }
+ else {
+ return mkdir($uri, $mode, $recursive, $context);
+ }
+}
+
+/**
+ * Removes a directory.
+ *
+ * PHP's rmdir() is broken on Windows, as it can fail to remove a directory
+ * when it has a read-only flag set.
+ *
+ * @param $uri
+ * A URI or pathname.
+ * @param $context
+ * Refer to http://php.net/manual/ref.stream.php
+ *
+ * @return
+ * Boolean TRUE on success, or FALSE on failure.
+ *
+ * @see rmdir()
+ * @ingroup php_wrappers
+ */
+function drupal_rmdir($uri, $context = NULL) {
+ $scheme = file_uri_scheme($uri);
+ if ((!$scheme || !file_stream_wrapper_valid_scheme($scheme)) && (substr(PHP_OS, 0, 3) == 'WIN')) {
+ chmod($uri, 0700);
+ }
+ if ($context) {
+ return rmdir($uri, $context);
+ }
+ else {
+ return rmdir($uri);
+ }
+}
+
+/**
+ * Creates a file with a unique filename in the specified directory.
+ *
+ * PHP's tempnam() does not return a URI like we want. This function
+ * will return a URI if given a URI, or it will return a filepath if
+ * given a filepath.
+ *
+ * Compatibility: normal paths and stream wrappers.
+ *
+ * @param $directory
+ * The directory where the temporary filename will be created.
+ * @param $prefix
+ * The prefix of the generated temporary filename.
+ * Note: Windows uses only the first three characters of prefix.
+ *
+ * @return
+ * The new temporary filename, or FALSE on failure.
+ *
+ * @see tempnam()
+ * @see http://drupal.org/node/515192
+ * @ingroup php_wrappers
+ */
+function drupal_tempnam($directory, $prefix) {
+ $scheme = file_uri_scheme($directory);
+
+ if ($scheme && file_stream_wrapper_valid_scheme($scheme)) {
+ $wrapper = file_stream_wrapper_get_instance_by_scheme($scheme);
+
+ if ($filename = tempnam($wrapper->getDirectoryPath(), $prefix)) {
+ return $scheme . '://' . drupal_basename($filename);
+ }
+ else {
+ return FALSE;
+ }
+ }
+ else {
+ // Handle as a normal tempnam() call.
+ return tempnam($directory, $prefix);
+ }
+}
+
+/**
+ * Gets the path of system-appropriate temporary directory.
+ */
+function file_directory_temp() {
+ $temporary_directory = variable_get('file_temporary_path', NULL);
+
+ if (empty($temporary_directory)) {
+ $directories = array();
+
+ // Has PHP been set with an upload_tmp_dir?
+ if (ini_get('upload_tmp_dir')) {
+ $directories[] = ini_get('upload_tmp_dir');
+ }
+
+ // Operating system specific dirs.
+ if (substr(PHP_OS, 0, 3) == 'WIN') {
+ $directories[] = 'c:\\windows\\temp';
+ $directories[] = 'c:\\winnt\\temp';
+ }
+ else {
+ $directories[] = '/tmp';
+ }
+ // PHP may be able to find an alternative tmp directory.
+ // This function exists in PHP 5 >= 5.2.1, but Drupal
+ // requires PHP 5 >= 5.2.0, so we check for it.
+ if (function_exists('sys_get_temp_dir')) {
+ $directories[] = sys_get_temp_dir();
+ }
+
+ foreach ($directories as $directory) {
+ if (is_dir($directory) && is_writable($directory)) {
+ $temporary_directory = $directory;
+ break;
+ }
+ }
+
+ if (empty($temporary_directory)) {
+ // If no directory has been found default to 'files/tmp'.
+ $temporary_directory = variable_get('file_public_path', conf_path() . '/files') . '/tmp';
+
+ // Windows accepts paths with either slash (/) or backslash (\), but will
+ // not accept a path which contains both a slash and a backslash. Since
+ // the 'file_public_path' variable may have either format, we sanitize
+ // everything to use slash which is supported on all platforms.
+ $temporary_directory = str_replace('\\', '/', $temporary_directory);
+ }
+ // Save the path of the discovered directory.
+ variable_set('file_temporary_path', $temporary_directory);
+ }
+
+ return $temporary_directory;
+}
+
+/**
+ * Examines a file object and returns appropriate content headers for download.
+ *
+ * @param $file
+ * A file object.
+ *
+ * @return
+ * An associative array of headers, as expected by file_transfer().
+ */
+function file_get_content_headers($file) {
+ $type = mime_header_encode($file->filemime);
+
+ return array(
+ 'Content-Type' => $type,
+ 'Content-Length' => $file->filesize,
+ 'Cache-Control' => 'private',
+ );
+}
+
+/**
+ * @} End of "defgroup file".
+ */