vendor: add github.com/goftp/server

vendor/github.com/goftp/server/driver.go

@@ -0,0 +1,61 @@
+// Copyright 2018 The goftp Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package server
+
+import "io"
+
+// DriverFactory is a driver factory to create driver. For each client that connects to the server, a new FTPDriver is required.
+// Create an implementation if this interface and provide it to FTPServer.
+type DriverFactory interface {
+	NewDriver() (Driver, error)
+}
+
+// Driver is an interface that you will create an implementation that speaks to your
+// chosen persistence layer. graval will create a new instance of your
+// driver for each client that connects and delegate to it as required.
+type Driver interface {
+	// Init init
+	Init(*Conn)
+
+	// params  - a file path
+	// returns - a time indicating when the requested path was last modified
+	//         - an error if the file doesn't exist or the user lacks
+	//           permissions
+	Stat(string) (FileInfo, error)
+
+	// params  - path
+	// returns - true if the current user is permitted to change to the
+	//           requested path
+	ChangeDir(string) error
+
+	// params  - path, function on file or subdir found
+	// returns - error
+	//           path
+	ListDir(string, func(FileInfo) error) error
+
+	// params  - path
+	// returns - nil if the directory was deleted or any error encountered
+	DeleteDir(string) error
+
+	// params  - path
+	// returns - nil if the file was deleted or any error encountered
+	DeleteFile(string) error
+
+	// params  - from_path, to_path
+	// returns - nil if the file was renamed or any error encountered
+	Rename(string, string) error
+
+	// params  - path
+	// returns - nil if the new directory was created or any error encountered
+	MakeDir(string) error
+
+	// params  - path
+	// returns - a string containing the file data to send to the client
+	GetFile(string, int64) (int64, io.ReadCloser, error)
+
+	// params  - destination path, an io.Reader containing the file data
+	// returns - the number of bytes writen and the first error encountered while writing, if any.
+	PutFile(string, io.Reader, bool) (int64, error)
+}