Many linter fixes for smtpd pkg

smtpd/filemsg.go

@@ -72,7 +72,7 @@ func (m *FileMessage) From() string {
 	return m.Ffrom
 }
 
-// From returns the value of the Message To header
+// To returns the value of the Message To header
 func (m *FileMessage) To() []string {
 	return m.Fto
 }

smtpd/filestore.go

@@ -150,10 +150,12 @@ type FileMailbox struct {
 	messages    []*FileMessage
 }
 
+// Name of the mailbox
 func (mb *FileMailbox) Name() string {
 	return mb.name
 }
 
+// String renders the name and directory path of the mailbox
 func (mb *FileMailbox) String() string {
 	return mb.name + "[" + mb.dirName + "]"
 }
@@ -184,11 +186,11 @@ func (mb *FileMailbox) GetMessage(id string) (datastore.Message, error) {
 
 	if id == "latest" && len(mb.messages) != 0 {
 		return mb.messages[len(mb.messages)-1], nil
-	} else {
-		for _, m := range mb.messages {
-			if m.Fid == id {
-				return m, nil
-			}
+	}
+
+	for _, m := range mb.messages {
+		if m.Fid == id {
+			return m, nil
 		}
 	}
 

smtpd/filestore_test.go

@@ -496,7 +496,7 @@ func TestGetLatestMessage(t *testing.T) {
 	assert.True(t, msg.ID() == id3, "Expected %q to be equal to %q", msg.ID(), id3)
 
 	// Test wrong id
-	msg, err = mb.GetMessage("wrongid")
+	_, err = mb.GetMessage("wrongid")
 	assert.Error(t, err)
 
 	if t.Failed() {

smtpd/handler.go

@@ -511,20 +511,16 @@ func (ss *Session) send(msg string) {
 
 // readByteLine reads a line of input into the provided buffer. Does
 // not reset the Buffer - please do so prior to calling.
-func (ss *Session) readByteLine(buf *bytes.Buffer) error {
+func (ss *Session) readByteLine(buf io.Writer) error {
 	if err := ss.conn.SetReadDeadline(ss.nextDeadline()); err != nil {
 		return err
 	}
-	for {
-		line, err := ss.reader.ReadBytes('\n')
-		if err != nil {
-			return err
-		}
-		if _, err = buf.Write(line); err != nil {
-			return err
-		}
-		return nil
+	line, err := ss.reader.ReadBytes('\n')
+	if err != nil {
+		return err
 	}
+	_, err = buf.Write(line)
+	return err
 }
 
 // Reads a line of input
@@ -573,7 +569,7 @@ func (ss *Session) parseCmd(line string) (cmd string, arg string, ok bool) {
 // The leading space is mandatory.
 func (ss *Session) parseArgs(arg string) (args map[string]string, ok bool) {
 	args = make(map[string]string)
-	re := regexp.MustCompile(" (\\w+)=(\\w+)")
+	re := regexp.MustCompile(` (\w+)=(\w+)`)
 	pm := re.FindAllStringSubmatch(arg, -1)
 	if pm == nil {
 		ss.logWarn("Failed to parse arg string: %q")

smtpd/handler_test.go

@@ -31,10 +31,8 @@ func TestGreetState(t *testing.T) {
 	server, logbuf, teardown := setupSMTPServer(mds)
 	defer teardown()
 
-	var script []scriptStep
-
 	// Test out some mangled HELOs
-	script = []scriptStep{
+	script := []scriptStep{
 		{"HELO", 501},
 		{"EHLO", 501},
 		{"HELLO", 500},
@@ -90,10 +88,8 @@ func TestReadyState(t *testing.T) {
 	server, logbuf, teardown := setupSMTPServer(mds)
 	defer teardown()
 
-	var script []scriptStep
-
 	// Test out some mangled READY commands
-	script = []scriptStep{
+	script := []scriptStep{
 		{"HELO localhost", 250},
 		{"FOOB", 500},
 		{"HELO", 503},
@@ -165,10 +161,8 @@ func TestMailState(t *testing.T) {
 	server, logbuf, teardown := setupSMTPServer(mds)
 	defer teardown()
 
-	var script []scriptStep
-
 	// Test out some mangled READY commands
-	script = []scriptStep{
+	script := []scriptStep{
 		{"HELO localhost", 250},
 		{"MAIL FROM:<john@gmail.com>", 250},
 		{"FOOB", 500},

smtpd/listener.go

@@ -131,10 +131,8 @@ func (s *Server) Start(ctx context.Context) {
 	go s.serve(ctx)
 
 	// Wait for shutdown
-	select {
-	case <-ctx.Done():
-		log.Tracef("SMTP shutdown requested, connections will be drained")
-	}
+	<-ctx.Done()
+	log.Tracef("SMTP shutdown requested, connections will be drained")
 
 	// Closing the listener will cause the serve() go routine to exit
 	if err := s.listener.Close(); err != nil {
@@ -186,7 +184,7 @@ func (s *Server) serve(ctx context.Context) {
 func (s *Server) emergencyShutdown() {
 	// Shutdown Inbucket
 	select {
-	case _ = <-s.globalShutdown:
+	case <-s.globalShutdown:
 	default:
 		close(s.globalShutdown)
 	}

smtpd/utils.go

@@ -130,15 +130,24 @@ LOOP:
 		switch {
 		case ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'):
 			// Letters are OK
-			_ = buf.WriteByte(c)
+			err = buf.WriteByte(c)
+			if err != nil {
+				return
+			}
 			inCharQuote = false
 		case '0' <= c && c <= '9':
 			// Numbers are OK
-			_ = buf.WriteByte(c)
+			err = buf.WriteByte(c)
+			if err != nil {
+				return
+			}
 			inCharQuote = false
 		case bytes.IndexByte([]byte("!#$%&'*+-/=?^_`{|}~"), c) >= 0:
 			// These specials can be used unquoted
-			_ = buf.WriteByte(c)
+			err = buf.WriteByte(c)
+			if err != nil {
+				return
+			}
 			inCharQuote = false
 		case c == '.':
 			// A single period is OK
@@ -146,13 +155,19 @@ LOOP:
 				// Sequence of periods is not permitted
 				return "", "", fmt.Errorf("Sequence of periods is not permitted")
 			}
-			_ = buf.WriteByte(c)
+			err = buf.WriteByte(c)
+			if err != nil {
+				return
+			}
 			inCharQuote = false
 		case c == '\\':
 			inCharQuote = true
 		case c == '"':
 			if inCharQuote {
-				_ = buf.WriteByte(c)
+				err = buf.WriteByte(c)
+				if err != nil {
+					return
+				}
 				inCharQuote = false
 			} else if inStringQuote {
 				inStringQuote = false
@@ -165,7 +180,10 @@ LOOP:
 			}
 		case c == '@':
 			if inCharQuote || inStringQuote {
-				_ = buf.WriteByte(c)
+				err = buf.WriteByte(c)
+				if err != nil {
+					return
+				}
 				inCharQuote = false
 			} else {
 				// End of local-part
@@ -182,7 +200,10 @@ LOOP:
 			return "", "", fmt.Errorf("Characters outside of US-ASCII range not permitted")
 		default:
 			if inCharQuote || inStringQuote {
-				_ = buf.WriteByte(c)
+				err = buf.WriteByte(c)
+				if err != nil {
+					return
+				}
 				inCharQuote = false
 			} else {
 				return "", "", fmt.Errorf("Character %q must be quoted", c)