vendor: add github.com/goftp/server

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

@@ -0,0 +1,48 @@
+// 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 (
+	"fmt"
+	"log"
+)
+
+type Logger interface {
+	Print(sessionId string, message interface{})
+	Printf(sessionId string, format string, v ...interface{})
+	PrintCommand(sessionId string, command string, params string)
+	PrintResponse(sessionId string, code int, message string)
+}
+
+// Use an instance of this to log in a standard format
+type StdLogger struct{}
+
+func (logger *StdLogger) Print(sessionId string, message interface{}) {
+	log.Printf("%s  %s", sessionId, message)
+}
+
+func (logger *StdLogger) Printf(sessionId string, format string, v ...interface{}) {
+	logger.Print(sessionId, fmt.Sprintf(format, v...))
+}
+
+func (logger *StdLogger) PrintCommand(sessionId string, command string, params string) {
+	if command == "PASS" {
+		log.Printf("%s > PASS ****", sessionId)
+	} else {
+		log.Printf("%s > %s %s", sessionId, command, params)
+	}
+}
+
+func (logger *StdLogger) PrintResponse(sessionId string, code int, message string) {
+	log.Printf("%s < %d %s", sessionId, code, message)
+}
+
+// Silent logger, produces no output
+type DiscardLogger struct{}
+
+func (logger *DiscardLogger) Print(sessionId string, message interface{})                  {}
+func (logger *DiscardLogger) Printf(sessionId string, format string, v ...interface{})     {}
+func (logger *DiscardLogger) PrintCommand(sessionId string, command string, params string) {}
+func (logger *DiscardLogger) PrintResponse(sessionId string, code int, message string)     {}