implement channel API (no use yet)

api/response.go

@@ -41,3 +41,21 @@ func NewUserListResponse(users []*User) []render.Renderer {
 func NewUserPayloadResponse(user *User) *UserPayload {
 	return &UserPayload{User: user}
 }
+
+func NewChannelResponse(channel *Channel) *ChannelResponse {
+	resp := &ChannelResponse{Channel: channel}
+
+	return resp
+}
+
+func (cr *ChannelResponse) Render(w http.ResponseWriter, r *http.Request) error {
+	return nil
+}
+
+func NewChannelListResponse(channels []*Channel) []render.Renderer {
+	list := []render.Renderer{}
+	for _, channel := range channels {
+		list = append(list, NewChannelResponse(channel))
+	}
+	return list
+}