feat: sending system messages (#248)

* test: added a test for system messages

* test: updated test

* test: updating test

* feat: ability to send system message

* test: updated test

* test: fixing test

* test: fix test

* fix: test

Author: totalimmersion

channel_test.go

@@ -281,9 +281,10 @@ func TestChannel_GetReplies(t *testing.T) {
 
 	msg = resp.Message
 
-	reply := &Message{Text: "test reply", ParentID: msg.ID, Type: MessageTypeReply}
-	_, err = ch.SendMessage(ctx, reply, randomUser(t, c).ID)
+	reply := &Message{Text: "test reply", ParentID: msg.ID}
+	resp, err = ch.SendMessage(ctx, reply, randomUser(t, c).ID)
 	require.NoError(t, err, "send reply")
+	require.Equal(t, MessageTypeReply, resp.Message.Type, "message type is reply")
 
 	repliesResp, err := ch.GetReplies(ctx, msg.ID, nil)
 	require.NoError(t, err, "get replies")
@@ -361,6 +362,25 @@ func TestChannel_SendMessage(t *testing.T) {
 	assert.True(t, msg2.Silent, "message silent flag is set")
 }
 
+func TestChannel_SendSystemMessage(t *testing.T) {
+	c := initClient(t)
+	ch := initChannel(t, c)
+	ctx := context.Background()
+	user := randomUser(t, c)
+	msg := &Message{
+		Text: "test message",
+		Type: MessageTypeSystem,
+	}
+
+	resp, err := ch.SendMessage(ctx, msg, user.ID)
+	require.NoError(t, err, "send message")
+
+	// check that message was updated
+	msg = resp.Message
+	assert.NotEmpty(t, msg.ID, "message has ID")
+	assert.Equal(t, MessageTypeSystem, msg.Type, "message type is system")
+}
+
 func TestChannel_Truncate(t *testing.T) {
 	c := initClient(t)
 	ch := initChannel(t, c)

message.go

@@ -92,6 +92,7 @@ func (m *Message) toRequest() messageRequest {
 
 	req.Message = messageRequestMessage{
 		Text:            m.Text,
+		Type:            m.Type,
 		Attachments:     m.Attachments,
 		User:            messageRequestUser{ID: m.User.ID},
 		ExtraData:       m.ExtraData,
@@ -121,17 +122,17 @@ type messageRequest struct {
 }
 
 type messageRequestMessage struct {
-	Text            string             `json:"text"`
-	Attachments     []*Attachment      `json:"attachments"`
-	User            messageRequestUser `json:"user"`
-	MentionedUsers  []string           `json:"mentioned_users"`
-	ParentID        string             `json:"parent_id"`
-	ShowInChannel   bool               `json:"show_in_channel"`
-	Silent          bool               `json:"silent"`
-	QuotedMessageID string             `json:"quoted_message_id"`
-	Pinned          bool               `json:"pinned"`
-
-	ExtraData map[string]interface{} `json:"-"`
+	Text            string                 `json:"text"`
+	Type            MessageType            `json:"type" validate:"omitempty,oneof=system"`
+	Attachments     []*Attachment          `json:"attachments"`
+	User            messageRequestUser     `json:"user"`
+	MentionedUsers  []string               `json:"mentioned_users"`
+	ParentID        string                 `json:"parent_id"`
+	ShowInChannel   bool                   `json:"show_in_channel"`
+	Silent          bool                   `json:"silent"`
+	QuotedMessageID string                 `json:"quoted_message_id"`
+	Pinned          bool                   `json:"pinned"`
+	ExtraData       map[string]interface{} `json:"-"`
 }
 
 type messageRequestForJSON messageRequestMessage