add !pm signature option

README.md

@@ -35,6 +35,7 @@ so you can use it to send emails from your apps and scripts as well.
 - [x] SMTP server (you can use Postmoogle as general purpose SMTP server to send emails from your scripts or apps)
 - [x] Send a message to matrix room with special format to send a new email, even to multiple email addresses at once
 - [x] Reply to matrix thread sends reply into email thread
+- [x] Email signatures
 
 ## Configuration
 
@@ -120,6 +121,7 @@ If you want to change them - check available options in the help message (`!pm h
 
 > The following section is visible to the mailbox owners only
 
+* **`!pm signature`** - Get or set signature of the room (markdown supported)
 * **`!pm nosend`** - Get or set `nosend` of the room (`true` - disable email sending; `false` - enable email sending)
 * **`!pm noreplies`** - Get or set `noreplies` of the room (`true` - ignore matrix replies; `false` - parse matrix replies)
 * **`!pm nosender`** - Get or set `nosender` of the room (`true` - hide email sender; `false` - show email sender)

bot/command.go

@@ -99,6 +99,12 @@ func (b *Bot) initCommands() commandList {
 			allowed:     b.allowOwner,
 		},
 		{allowed: b.allowOwner, description: "mailbox options"}, // delimiter
+		{
+			key:         config.RoomSignature,
+			description: "Get or set signature of the room (markdown supported)",
+			sanitizer:   func(s string) string { return s },
+			allowed:     b.allowOwner,
+		},
 		{
 			key: config.RoomNoSend,
 			description: fmt.Sprintf(
@@ -523,6 +529,14 @@ func (b *Bot) runSend(ctx context.Context) {
 		htmlBody = format.RenderMarkdown(body, true, true).FormattedBody
 	}
 
+	signature := format.RenderMarkdown(cfg.Signature(), true, true)
+	if signature.Body != "" {
+		body += "\n\n---\n" + signature.Body
+		if htmlBody != "" {
+			htmlBody += "<br><hr><br>" + signature.FormattedBody
+		}
+	}
+
 	tos := strings.Split(to, ",")
 	// validate first
 	for _, to := range tos {

bot/command_owner.go

@@ -84,7 +84,7 @@ func (b *Bot) getOption(ctx context.Context, name string) {
 	b.SendNotice(ctx, evt.RoomID, msg)
 }
 
-//nolint:gocognit
+//nolint:gocognit // TODO
 func (b *Bot) setOption(ctx context.Context, name, value string) {
 	cmd := b.commands.get(name)
 	if cmd != nil && cmd.sanitizer != nil {
@@ -119,6 +119,14 @@ func (b *Bot) setOption(ctx context.Context, name, value string) {
 		}
 	}
 
+	if name == config.RoomSignature {
+		value = strings.Join(b.parseCommand(evt.Content.AsMessage().Body, false)[1:], " ")
+	}
+
+	if value == "reset" {
+		value = ""
+	}
+
 	old := cfg.Get(name)
 	cfg.Set(name, value)
 

bot/config/room.go

@@ -29,6 +29,7 @@ const (
 	RoomNoFiles       = "nofiles"
 	RoomNoInlines     = "noinlines"
 	RoomPassword      = "password"
+	RoomSignature     = "signature"
 	RoomSpamcheckDKIM = "spamcheck:dkim"
 	RoomSpamcheckSMTP = "spamcheck:smtp"
 	RoomSpamcheckSPF  = "spamcheck:spf"
@@ -66,6 +67,10 @@ func (s Room) Password() string {
 	return s.Get(RoomPassword)
 }
 
+func (s Room) Signature() string {
+	return s.Get(RoomSignature)
+}
+
 func (s Room) NoSend() bool {
 	return utils.Bool(s.Get(RoomNoSend))
 }

bot/email.go

@@ -158,6 +158,8 @@ func (b *Bot) IncomingEmail(ctx context.Context, email *email.Email) error {
 }
 
 // SendEmailReply sends replies from matrix thread to email thread
+//
+//nolint:gocognit // TODO
 func (b *Bot) SendEmailReply(ctx context.Context) {
 	evt := eventFromContext(ctx)
 	if !b.allowSend(evt.Sender, evt.RoomID) {
@@ -194,10 +196,17 @@ func (b *Bot) SendEmailReply(ctx context.Context) {
 	if meta.Subject == "" {
 		meta.Subject = strings.SplitN(content.Body, "\n", 1)[0]
 	}
+	signature := format.RenderMarkdown(cfg.Signature(), true, true)
 	body := content.Body
+	if signature.Body != "" {
+		body += "\n\n---\n" + signature.Body
+	}
 	var htmlBody string
 	if !cfg.NoHTML() {
 		htmlBody = content.FormattedBody
+		if htmlBody != "" && signature.FormattedBody != "" {
+			htmlBody += "<br><hr><br>" + signature.FormattedBody
+		}
 	}
 
 	meta.MessageID = email.MessageID(evt.ID, meta.FromDomain)