Inheritance diagram for file_system:

Public Member Functions
	add_file_from_path ($pathname, $contenthash=null)
	Add the supplied file to the file system. More...

	add_file_from_string ($content)
	Add a file with the supplied content to the file system. More...

	add_storedfile_to_archive (stored_file $file, file_archive $filearch, $archivepath)
	Add file/directory into archive. More...

	add_to_curl_request (stored_file $file, &$curlrequest, $key)
	Adds this file path to a curl request (POST only). More...

	copy_content_from_storedfile (stored_file $file, $target)
	Copy content of file to given pathname. More...

	cron ()
	Run any periodic tasks which must be performed.

	extract_to_pathname (stored_file $file, file_packer $packer, $pathname, file_progress $progress=null)
	Extract file to given file path (real OS filesystem), existing files are overwritten. More...

	extract_to_storage (stored_file $file, file_packer $packer, $contextid, $component, $filearea, $itemid, $pathbase, $userid=null, file_progress $progress=null)
	Extract file to given file path (real OS filesystem), existing files are overwritten. More...

	get_content (stored_file $file)
	Get the content of the specified stored file. More...

	get_content_file_handle (stored_file $file, $type=stored_file::FILE_HANDLE_FOPEN)
	Returns file handle - read only mode, no writing allowed into pool files! More...

	get_imageinfo (stored_file $file)
	Returns information about image. More...

	get_local_path_from_storedfile (stored_file $file, $fetchifnotfound=false)
	Get the full path on disk for the specified stored file. More...

	get_remote_path_from_storedfile (stored_file $file)
	Get a remote filepath for the specified stored file. More...

	is_file_readable_locally_by_hash ($contenthash, $fetchifnotfound=false)
	Determine whether the file is present on the file system somewhere given the contenthash. More...

	is_file_readable_locally_by_storedfile (stored_file $file, $fetchifnotfound=false)
	Determine whether the file is present on the file system somewhere. More...

	is_file_readable_remotely_by_hash ($contenthash)
	Determine whether the file is present locally on the file system somewhere given the contenthash. More...

	is_file_readable_remotely_by_storedfile (stored_file $file)
	Determine whether the file is present on the local file system somewhere. More...

	is_image_from_storedfile (stored_file $file)
	Attempt to determine whether the specified file is likely to be an image. More...

	list_files ($file, file_packer $packer)
	List contents of archive. More...

	mimetype_from_hash ($contenthash, $filename)
	Retrieve the mime information for the specified stored file. More...

	mimetype_from_storedfile ($file)
	Retrieve the mime information for the specified stored file. More...

	readfile (stored_file $file)
	Output the content of the specified stored file. More...

	remove_file ($contenthash)
	Remove the file with the specified contenthash. More...

	supports_xsendfile ()
	Returns true if filesystem is configured to support xsendfile. More...

	xsendfile ($contenthash)
	Serve file content using X-Sendfile header. More...

Protected Member Functions
	__clone ()
	Private clone method to prevent cloning of the instance.

	__wakeup ()
	Private wakeup method to prevent unserialising of the instance.

	get_imageinfo_from_path ($path)
	Returns image information relating to the specified path or URL. More...

	get_local_path_from_hash ($contenthash, $fetchifnotfound=false)
	Get the full path for the specified hash, including the path to the filedir. More...

	get_remote_path_from_hash ($contenthash)
	Get the full path for the specified hash, including the path to the filedir. More...

	validate_hash_and_file_size ($contenthash, $pathname)
	Validate that the content hash matches the content hash of the file on disk. More...

Static Protected Member Functions
static	get_file_handle_for_path ($path, $type=stored_file::FILE_HANDLE_FOPEN)
	Return a file handle for the specified path. More...

static	is_file_removable ($contenthash)
	Check whether a file is removable. More...

Member Function Documentation

◆ add_file_from_path()

file_system::add_file_from_path	(	$pathname,
		$contenthash = `null`
	)

abstract

Add the supplied file to the file system.

Note: If overriding this function, it is advisable to store the file in the path returned by get_local_path_from_hash as there may be subsequent uses of the file in the same request.

Parameters

string	$pathname	Path to file currently on disk
string	$contenthash	SHA1 hash of content if known (performance only)

Return values

array (contenthash, filesize, newfile)

Reimplemented in file_system_filedir.

◆ add_file_from_string()

file_system::add_file_from_string ( $content )

abstract

Add a file with the supplied content to the file system.

Note: If overriding this function, it is advisable to store the file in the path returned by get_local_path_from_hash as there may be subsequent uses of the file in the same request.

Parameters

string $content file content - binary string

Return values

array (contenthash, filesize, newfile)

Reimplemented in file_system_filedir.

◆ add_storedfile_to_archive()

file_system::add_storedfile_to_archive	(	stored_file	$file,
		file_archive	$filearch,
			$archivepath
	)

Add file/directory into archive.

Parameters

stored_file	$file	The file to archive
file_archive	$filearch	file archive instance
string	$archivepath	pathname in archive

Return values

bool success

◆ add_to_curl_request()

file_system::add_to_curl_request	(	stored_file	$file,
		&	$curlrequest,
			$key
	)

Adds this file path to a curl request (POST only).

Parameters

stored_file	$file	The file to add to the curl request
curl	$curlrequest	The curl request object
string	$key	What key to use in the POST request

Return values

void	This needs the fullpath for the storedfile :/ Can this be achieved in some other fashion?

◆ copy_content_from_storedfile()

file_system::copy_content_from_storedfile	(	stored_file	$file,
			$target
	)

abstract

Copy content of file to given pathname.

Parameters

stored_file	$file	The file to be copied
string	$target	real path to the new file

Return values

bool success

Reimplemented in file_system_filedir.

◆ extract_to_pathname()

file_system::extract_to_pathname	(	stored_file	$file,
		file_packer	$packer,
			$pathname,
		file_progress	$progress = `null`
	)

Extract file to given file path (real OS filesystem), existing files are overwritten.

Parameters

stored_file	$file	The archive to inspect
file_packer	$packer	File packer instance
string	$pathname	Target directory
file_progress	$progress	progress indicator callback or null if not required

Return values

array|bool List of processed files; false if error

◆ extract_to_storage()

file_system::extract_to_storage	(	stored_file	$file,
		file_packer	$packer,
			$contextid,
			$component,
			$filearea,
			$itemid,
			$pathbase,
			$userid = `null`,
		file_progress	$progress = `null`
	)

Extract file to given file path (real OS filesystem), existing files are overwritten.

Parameters

stored_file	$file	The archive to inspect
file_packer	$packer	file packer instance
int	$contextid	context ID
string	$component	component
string	$filearea	file area
int	$itemid	item ID
string	$pathbase	path base
int	$userid	user ID
file_progress	$progress	Progress indicator callback or null if not required

Return values

array|bool list of processed files; false if error

◆ get_content()

file_system::get_content ( stored_file $file )

Get the content of the specified stored file.

Generally you will probably want to use readfile() to serve content, and where possible you should see if you can use get_content_file_handle and work with the file stream instead.

Parameters

stored_file $file The file to retrieve

Return values

string The full file content

◆ get_content_file_handle()

file_system::get_content_file_handle	(	stored_file	$file,
			$type = `stored_file::FILE_HANDLE_FOPEN`
	)

Returns file handle - read only mode, no writing allowed into pool files!

When you want to modify a file, create a new file and delete the old one.

Parameters

stored_file	$file	The file to retrieve a handle for
int	$type	Type of file handle (FILE_HANDLE_xx constant)

Return values

resource file handle

◆ get_file_handle_for_path()

static file_system::get_file_handle_for_path	(	$path,
		$type = `stored_file::FILE_HANDLE_FOPEN`
	)

staticprotected

Return a file handle for the specified path.

This abstraction should be used when overriding get_content_file_handle in a new file system.

Parameters

string	$path	The path to the file. This shoudl be any type of path that fopen and gzopen accept.
int	$type	Type of file handle (FILE_HANDLE_xx constant)

Return values

resource

Exceptions

coding_exception When an unexpected type of file handle is requested

◆ get_imageinfo()

file_system::get_imageinfo ( stored_file $file )

Returns information about image.

Information is determined from the file content

Parameters

stored_file $file The file to inspect

Return values

mixed array with width, height and mimetype; false if not an image

◆ get_imageinfo_from_path()

file_system::get_imageinfo_from_path ( $path )

protected

Returns image information relating to the specified path or URL.

Parameters

string $path The path to pass to getimagesize.

Return values

array Containing width, height, and mimetype.

◆ get_local_path_from_hash()

file_system::get_local_path_from_hash	(	$contenthash,
		$fetchifnotfound = `false`
	)

abstractprotected

Get the full path for the specified hash, including the path to the filedir.

Note: This must return a consistent path for the file's contenthash and the path will be in a standard local format. Streamable paths will not work. A local copy of the file will be fetched if $fetchifnotfound is tree.

The $fetchifnotfound allows you to determine the expected path of the file.

Parameters

string	$contenthash	The content hash
bool	$fetchifnotfound	Whether to attempt to fetch from the remote path if not found.

Return values

string The full path to the content file

Reimplemented in file_system_filedir.

◆ get_local_path_from_storedfile()

file_system::get_local_path_from_storedfile	(	stored_file	$file,
			$fetchifnotfound = `false`
	)

Get the full path on disk for the specified stored file.

Note: This must return a consistent path for the file's contenthash and the path will be in a standard local format. Streamable paths will not work. A local copy of the file will be fetched if $fetchifnotfound is tree.

The $fetchifnotfound allows you to determine the expected path of the file.

Parameters

stored_file	$file	The file to serve.
bool	$fetchifnotfound	Whether to attempt to fetch from the remote path if not found.

Return values

string full path to pool file with file content

Reimplemented in file_system_filedir.

◆ get_remote_path_from_hash()

file_system::get_remote_path_from_hash ( $contenthash )

abstractprotected

Get the full path for the specified hash, including the path to the filedir.

This is typically either the same as the local filepath, or it is a streamable resource.

See https://secure.php.net/manual/en/wrappers.php for further information on valid wrappers.

Parameters

string $contenthash The content hash

Return values

string The full path to the content file

Reimplemented in file_system_filedir.

◆ get_remote_path_from_storedfile()

file_system::get_remote_path_from_storedfile ( stored_file $file )

Get a remote filepath for the specified stored file.

This is typically either the same as the local filepath, or it is a streamable resource.

See https://secure.php.net/manual/en/wrappers.php for further information on valid wrappers.

Parameters

stored_file $file The file to serve.

Return values

string full path to pool file with file content

Reimplemented in file_system_filedir.

◆ is_file_readable_locally_by_hash()

file_system::is_file_readable_locally_by_hash	(	$contenthash,
		$fetchifnotfound = `false`
	)

Determine whether the file is present on the file system somewhere given the contenthash.

Parameters

string	$contenthash	The contenthash of the file to check.
bool	$fetchifnotfound	Whether to attempt to fetch from the remote path if not found.

Return values

bool

◆ is_file_readable_locally_by_storedfile()

file_system::is_file_readable_locally_by_storedfile	(	stored_file	$file,
			$fetchifnotfound = `false`
	)

Determine whether the file is present on the file system somewhere.

A local copy of the file will be fetched if $fetchifnotfound is tree.

The $fetchifnotfound allows you to determine the expected path of the file.

Parameters

stored_file	$file	The file to ensure is available.
bool	$fetchifnotfound	Whether to attempt to fetch from the remote path if not found.

Return values

bool

◆ is_file_readable_remotely_by_hash()

file_system::is_file_readable_remotely_by_hash ( $contenthash )

Determine whether the file is present locally on the file system somewhere given the contenthash.

Parameters

string $contenthash The contenthash of the file to check.

Return values

bool

◆ is_file_readable_remotely_by_storedfile()

file_system::is_file_readable_remotely_by_storedfile ( stored_file $file )

Determine whether the file is present on the local file system somewhere.

Parameters

stored_file $file The file to ensure is available.

Return values

bool

◆ is_file_removable()

static file_system::is_file_removable ( $contenthash )

staticprotected

Check whether a file is removable.

This must be called prior to file removal.

Parameters

string $contenthash

Return values

bool

◆ is_image_from_storedfile()

file_system::is_image_from_storedfile ( stored_file $file )

Attempt to determine whether the specified file is likely to be an image.

Since this relies upon the mimetype stored in the files table, there may be times when this information is not 100% accurate.

Parameters

stored_file $file The file to check

Return values

bool

◆ list_files()

file_system::list_files	(		$file,
		file_packer	$packer
	)

List contents of archive.

Parameters

stored_file	$file	The archive to inspect
file_packer	$packer	file packer instance

Return values

array of file infos

◆ mimetype_from_hash()

file_system::mimetype_from_hash	(	$contenthash,
		$filename
	)

Retrieve the mime information for the specified stored file.

Parameters

string	$contenthash
string	$filename

Return values

string The MIME type.

◆ mimetype_from_storedfile()

file_system::mimetype_from_storedfile ( $file )

Retrieve the mime information for the specified stored file.

Parameters

stored_file $file The stored file to retrieve mime information for

Return values

string The MIME type.

◆ readfile()

file_system::readfile ( stored_file $file )

Output the content of the specified stored file.

Note, this is different to get_content() as it uses the built-in php readfile function which is more efficient.

Parameters

stored_file $file The file to serve.

Return values

void

◆ remove_file()

file_system::remove_file ( $contenthash )

abstract

Remove the file with the specified contenthash.

Note, if overriding this function, you must check that the file is no longer in use - see {check_file_usage}.

DO NOT call directly - reserved for core!!

Parameters

string $contenthash

Reimplemented in file_system_filedir.

◆ supports_xsendfile()

file_system::supports_xsendfile ( )

Returns true if filesystem is configured to support xsendfile.

Return values

bool

◆ validate_hash_and_file_size()

file_system::validate_hash_and_file_size	(	$contenthash,
		$pathname
	)

protected

Validate that the content hash matches the content hash of the file on disk.

Parameters

string	$contenthash	The current content hash to validate
string	$pathname	The path to the file on disk

Return values

array The content hash (it might change) and file size

◆ xsendfile()

file_system::xsendfile ( $contenthash )

Serve file content using X-Sendfile header.

Please make sure that all headers are already sent and the all access control checks passed.

Parameters

string $contenthash The content hash of the file to be served

Return values

bool success

The documentation for this class was generated from the following file:

lib/filestorage/file_system.php

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Member Function Documentation

◆ add_file_from_path()

◆ add_file_from_string()

◆ add_storedfile_to_archive()

◆ add_to_curl_request()

◆ copy_content_from_storedfile()

◆ extract_to_pathname()

◆ extract_to_storage()

◆ get_content()

◆ get_content_file_handle()

◆ get_file_handle_for_path()

◆ get_imageinfo()

◆ get_imageinfo_from_path()

◆ get_local_path_from_hash()

◆ get_local_path_from_storedfile()

◆ get_remote_path_from_hash()

◆ get_remote_path_from_storedfile()

◆ is_file_readable_locally_by_hash()

◆ is_file_readable_locally_by_storedfile()

◆ is_file_readable_remotely_by_hash()

◆ is_file_readable_remotely_by_storedfile()

◆ is_file_removable()

◆ is_image_from_storedfile()

◆ list_files()

◆ mimetype_from_hash()

◆ mimetype_from_storedfile()

◆ readfile()

◆ remove_file()

◆ supports_xsendfile()

◆ validate_hash_and_file_size()

◆ xsendfile()