* Added ability to set greeting setting, get started setting and persistent menu setting

* Added IsEcho in Message which is indicator of own messages
* Added QuickReply in Message for sending of quick reply buttons with message
* Added mux parameter in Messenger constructor. It is useful when single go app processes the several bots
* Added Messenger.SenderAction which allows to show writing and reading status
* Added Messenger.GreetingSetting and Messenger.CallToActionsSetting which allow to set the bot settings
* Fixed bug with nil returning instead of error object

message.go

@@ -10,6 +10,8 @@ type Message struct {
 	Recipient Recipient `json:"-"`
 	// Time is when the message was sent.
 	Time time.Time `json:"-"`
+	// Message is mine
+	IsEcho bool `json:"is_echo,omitempty"`
 	// Mid is the ID of the message.
 	Mid string `json:"mid"`
 	// Seq is order the message was sent in relation to other messages.
@@ -19,6 +21,8 @@ type Message struct {
 	// Attachments is the information about the attachments which were sent
 	// with the message.
 	Attachments []Attachment `json:"attachments"`
+	// Selected quick reply
+	QuickReply *QuickReply `json:"quick_reply,omitempty"`
 }
 
 // Delivery represents a the event fired when Facebook delivers a message to the

messenger.go

@@ -1,6 +1,7 @@
 package messenger
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
@@ -11,6 +12,8 @@ const (
 	// ProfileURL is the API endpoint used for retrieving profiles.
 	// Used in the form: https://graph.facebook.com/v2.6/<USER_ID>?fields=first_name,last_name,profile_pic&access_token=<PAGE_ACCESS_TOKEN>
 	ProfileURL = "https://graph.facebook.com/v2.6/"
+	// SendSettingsURL is API endpoint for saving settings.
+	SendSettingsURL = "https://graph.facebook.com/v2.6/me/thread_settings"
 )
 
 // Options are the settings used when creating a Messenger client.
@@ -25,6 +28,8 @@ type Options struct {
 	Token string
 	// WebhookURL is where the Messenger client should listen for webhook events. Leaving the string blank implies a path of "/".
 	WebhookURL string
+	// Mux is shared mux between several Messenger objects
+	Mux *http.ServeMux
 }
 
 // MessageHandler is a handler used for responding to a message containing text.
@@ -52,8 +57,12 @@ type Messenger struct {
 
 // New creates a new Messenger. You pass in Options in order to affect settings.
 func New(mo Options) *Messenger {
+	if mo.Mux == nil {
+		mo.Mux = http.NewServeMux()
+	}
+
 	m := &Messenger{
-		mux:   http.NewServeMux(),
+		mux:   mo.Mux,
 		token: mo.Token,
 	}
 
@@ -116,6 +125,65 @@ func (m *Messenger) ProfileByID(id int64) (Profile, error) {
 	return p, err
 }
 
+// GreetingSetting sends settings for greeting
+func (m *Messenger) GreetingSetting(text string) error {
+	d := GreetingSetting{
+		SettingType: "greeting",
+		Greeting: GreetingInfo{
+			Text: text,
+		},
+	}
+
+	data, err := json.Marshal(d)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", SendSettingsURL, bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.URL.RawQuery = "access_token=" + m.token
+
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+	defer resp.Body.Close()
+
+	return err
+}
+
+// CallToActionsSetting sends settings for Get Started or Persist Menu
+func (m *Messenger) CallToActionsSetting(state string, actions []CallToActionsItem) error {
+	d := CallToActionsSetting{
+		SettingType:   "call_to_actions",
+		ThreadState:   state,
+		CallToActions: actions,
+	}
+
+	data, err := json.Marshal(d)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", SendSettingsURL, bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.URL.RawQuery = "access_token=" + m.token
+
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+	defer resp.Body.Close()
+
+	return err
+}
+
 // handle is the internal HTTP handler for the webhooks.
 func (m *Messenger) handle(w http.ResponseWriter, r *http.Request) {
 	if r.Method == "GET" {
@@ -186,6 +254,14 @@ func (m *Messenger) dispatch(r Receive) {
 	}
 }
 
+// Response returns new Response object
+func (m *Messenger) Response(to int64) *Response {
+	return &Response{
+		to:    Recipient{to},
+		token: m.token,
+	}
+}
+
 // classify determines what type of message a webhook event is.
 func (m *Messenger) classify(info MessageInfo, e Entry) Action {
 	if info.Message != nil {

receiving.go

@@ -60,9 +60,9 @@ type Attachment struct {
 // QuickReply is a file which used in a message.
 type QuickReply struct {
 	// ContentType is the type of reply
-	ContentType string `json:"content_type"`
+	ContentType string `json:"content_type,omitempty"`
 	// Title is the reply title
-	Title string `json:"title"`
+	Title string `json:"title,omitempty"`
 	// Payload is the  reply information
 	Payload string `json:"payload"`
 }

response.go

@@ -39,7 +39,7 @@ func (r *Response) TextWithReplies(message string, replies []QuickReply) error {
 
 	data, err := json.Marshal(m)
 	if err != nil {
-		return nil
+		return err
 	}
 
 	req, err := http.NewRequest("POST", SendMessageURL, bytes.NewBuffer(data))
@@ -122,7 +122,7 @@ func (r *Response) ButtonTemplate(text string, buttons *[]StructuredMessageButto
 
 	data, err := json.Marshal(m)
 	if err != nil {
-		return nil
+		return err
 	}
 
 	req, err := http.NewRequest("POST", SendMessageURL, bytes.NewBuffer(data))
@@ -142,7 +142,7 @@ func (r *Response) ButtonTemplate(text string, buttons *[]StructuredMessageButto
 }
 
 // GenericTemplate is a message which allows for structural elements to be sent
-func (r *Response) GenericTemplate(text string, elements *[]StructuredMessageElement) error {
+func (r *Response) GenericTemplate(elements *[]StructuredMessageElement) error {
 	m := SendStructuredMessage{
 		Recipient: r.to,
 		Message: StructuredMessageData{
@@ -159,7 +159,35 @@ func (r *Response) GenericTemplate(text string, elements *[]StructuredMessageEle
 
 	data, err := json.Marshal(m)
 	if err != nil {
-		return nil
+		return err
+	}
+
+	req, err := http.NewRequest("POST", SendMessageURL, bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.URL.RawQuery = "access_token=" + r.token
+
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+	defer resp.Body.Close()
+
+	return err
+}
+
+// SenderAction sends a info about sender action
+func (r *Response) SenderAction(action string) error {
+	m := SendSenderAction{
+		Recipient:    r.to,
+		SenderAction: action,
+	}
+
+	data, err := json.Marshal(m)
+	if err != nil {
+		return err
 	}
 
 	req, err := http.NewRequest("POST", SendMessageURL, bytes.NewBuffer(data))
@@ -212,16 +240,18 @@ type StructuredMessageAttachment struct {
 // StructuredMessagePayload is the actual payload of an attachment
 type StructuredMessagePayload struct {
 	// TemplateType must be button, generic or receipt
-	TemplateType string                      `json:"template_type"`
+	TemplateType string                      `json:"template_type,omitempty"`
 	Text         string                      `json:"text,omitempty"`
 	Elements     *[]StructuredMessageElement `json:"elements,omitempty"`
 	Buttons      *[]StructuredMessageButton  `json:"buttons,omitempty"`
+	Url          string                      `json:"url,omitempty"`
 }
 
 // StructuredMessageElement is a response containing structural elements
 type StructuredMessageElement struct {
 	Title    string                    `json:"title"`
 	ImageURL string                    `json:"image_url"`
+	ItemURL  string                    `json:"item_url"`
 	Subtitle string                    `json:"subtitle"`
 	Buttons  []StructuredMessageButton `json:"buttons"`
 }
@@ -229,6 +259,13 @@ type StructuredMessageElement struct {
 // StructuredMessageButton is a response containing buttons
 type StructuredMessageButton struct {
 	Type    string `json:"type"`
-	URL   string `json:"url"`
+	URL     string `json:"url,omitempty"`
 	Title   string `json:"title"`
+	Payload string `json:"payload,omitempty"`
+}
+
+// SendSenderAction is the information about sender action
+type SendSenderAction struct {
+	Recipient    Recipient `json:"recipient"`
+	SenderAction string    `json:"sender_action"`
 }

settings.go

@@ -0,0 +1,27 @@
+package messenger
+
+// GreetingSetting is the setting for greeting message
+type GreetingSetting struct {
+	SettingType string       `json:"setting_type"`
+	Greeting    GreetingInfo `json:"greeting"`
+}
+
+// GreetingInfo contains greeting message
+type GreetingInfo struct {
+	Text string `json:"text"`
+}
+
+// CallToActionsSetting is the settings for Get Started and Persist Menu
+type CallToActionsSetting struct {
+	SettingType   string              `json:"setting_type"`
+	ThreadState   string              `json:"thread_state"`
+	CallToActions []CallToActionsItem `json:"call_to_actions"`
+}
+
+// CallToActionsItem contains Get Started button or item of Persist Menu
+type CallToActionsItem struct {
+	Type    string `json:"type,omitempty"`
+	Title   string `json:"title,omitempty"`
+	Payload string `json:"payload,omitempty"`
+	URL     string `json:"url,omitempty"`
+}