Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\StreamWrapper;
Chris@0: 
Chris@0: /**
Chris@0:  * Defines a read-only Drupal stream wrapper base class for local files.
Chris@0:  *
Chris@0:  * This class extends the complete stream wrapper implementation in LocalStream.
Chris@0:  * URIs such as "public://example.txt" are expanded to a normal filesystem path
Chris@0:  * such as "sites/default/files/example.txt" and then PHP filesystem functions
Chris@0:  * are invoked.
Chris@0:  *
Chris@0:  * Drupal\Core\StreamWrapper\LocalReadOnlyStream implementations need to
Chris@0:  * implement at least the getDirectoryPath() and getExternalUrl() methods.
Chris@0:  */
Chris@0: abstract class LocalReadOnlyStream extends LocalStream {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getType() {
Chris@0:     return StreamWrapperInterface::READ_VISIBLE | StreamWrapperInterface::LOCAL;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function stream_open($uri, $mode, $options, &$opened_path) {
Chris@0:     if (!in_array($mode, ['r', 'rb', 'rt'])) {
Chris@0:       if ($options & STREAM_REPORT_ERRORS) {
Chris@0:         trigger_error('stream_open() write modes not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:       }
Chris@0:       return FALSE;
Chris@0:     }
Chris@0:     return parent::stream_open($uri, $mode, $options, $opened_path);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for flock().
Chris@0:    *
Chris@0:    * An exclusive lock attempt will be rejected, as this is a read-only stream
Chris@0:    * wrapper.
Chris@0:    *
Chris@0:    * @param int $operation
Chris@0:    *   One of the following:
Chris@0:    *   - LOCK_SH to acquire a shared lock (reader).
Chris@0:    *   - LOCK_EX to acquire an exclusive lock (writer).
Chris@0:    *   - LOCK_UN to release a lock (shared or exclusive).
Chris@0:    *   - LOCK_NB added as a bitmask if you don't want flock() to block while
Chris@0:    *     locking (not supported on Windows).
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   Return FALSE for an exclusive lock (writer), as this is a read-only
Chris@0:    *   stream wrapper.  Return the result of flock() for other valid operations.
Chris@0:    *   Defaults to TRUE if an invalid operation is passed.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.stream-lock.php
Chris@0:    */
Chris@0:   public function stream_lock($operation) {
Chris@0:     // Disallow exclusive lock or non-blocking lock requests
Chris@0:     if (in_array($operation, [LOCK_EX, LOCK_EX | LOCK_NB])) {
Chris@0:       trigger_error('stream_lock() exclusive lock operations not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:       return FALSE;
Chris@0:     }
Chris@0:     if (in_array($operation, [LOCK_SH, LOCK_UN, LOCK_SH | LOCK_NB])) {
Chris@0:       return flock($this->handle, $operation);
Chris@0:     }
Chris@0: 
Chris@0:     return TRUE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for fwrite(), file_put_contents() etc.
Chris@0:    *
Chris@0:    * Data will not be written as this is a read-only stream wrapper.
Chris@0:    *
Chris@0:    * @param string $data
Chris@0:    *   The string to be written.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   FALSE as data will not be written.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.stream-write.php
Chris@0:    */
Chris@0:   public function stream_write($data) {
Chris@0:     trigger_error('stream_write() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for fflush().
Chris@0:    *
Chris@0:    * Nothing will be output to the file, as this is a read-only stream wrapper.
Chris@0:    * However as stream_flush is called during stream_close we should not trigger
Chris@0:    * an error.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   FALSE, as no data will be stored.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.stream-flush.php
Chris@0:    */
Chris@0:   public function stream_flush() {
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    *
Chris@0:    * Does not change meta data as this is a read-only stream wrapper.
Chris@0:    */
Chris@0:   public function stream_metadata($uri, $option, $value) {
Chris@0:     trigger_error('stream_metadata() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function stream_truncate($new_size) {
Chris@0:     trigger_error('stream_truncate() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for unlink().
Chris@0:    *
Chris@0:    * The file will not be deleted from the stream as this is a read-only stream
Chris@0:    * wrapper.
Chris@0:    *
Chris@0:    * @param string $uri
Chris@0:    *   A string containing the uri to the resource to delete.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   TRUE so that file_delete() will remove db reference to file. File is not
Chris@0:    *   actually deleted.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.unlink.php
Chris@0:    */
Chris@0:   public function unlink($uri) {
Chris@0:     trigger_error('unlink() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return TRUE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for rename().
Chris@0:    *
Chris@0:    * The file will not be renamed as this is a read-only stream wrapper.
Chris@0:    *
Chris@0:    * @param string $from_uri
Chris@0:    *   The uri to the file to rename.
Chris@0:    * @param string $to_uri
Chris@0:    *   The new uri for file.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   FALSE as file will never be renamed.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.rename.php
Chris@0:    */
Chris@0:   public function rename($from_uri, $to_uri) {
Chris@0:     trigger_error('rename() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for mkdir().
Chris@0:    *
Chris@0:    * Directory will never be created as this is a read-only stream wrapper.
Chris@0:    *
Chris@0:    * @param string $uri
Chris@0:    *   A string containing the URI to the directory to create.
Chris@0:    * @param int $mode
Chris@0:    *   Permission flags - see mkdir().
Chris@0:    * @param int $options
Chris@0:    *   A bit mask of STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   FALSE as directory will never be created.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.mkdir.php
Chris@0:    */
Chris@0:   public function mkdir($uri, $mode, $options) {
Chris@0:     trigger_error('mkdir() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Support for rmdir().
Chris@0:    *
Chris@0:    * Directory will never be deleted as this is a read-only stream wrapper.
Chris@0:    *
Chris@0:    * @param string $uri
Chris@0:    *   A string containing the URI to the directory to delete.
Chris@0:    * @param int $options
Chris@0:    *   A bit mask of STREAM_REPORT_ERRORS.
Chris@0:    *
Chris@0:    * @return bool
Chris@0:    *   FALSE as directory will never be deleted.
Chris@0:    *
Chris@0:    * @see http://php.net/manual/streamwrapper.rmdir.php
Chris@0:    */
Chris@0:   public function rmdir($uri, $options) {
Chris@0:     trigger_error('rmdir() not supported for read-only stream wrappers', E_USER_WARNING);
Chris@0:     return FALSE;
Chris@0:   }
Chris@0: 
Chris@0: }