Merge pull request #25 from Neur0toxine/send-reactions

add reaction sending support for Instagram

.github/workflows/ci.yml

@@ -12,12 +12,31 @@ env:
   GO111MODULE: on
 
 jobs:
+  golangci:
+    name: lint
+    if: ${{ github.event_name == 'pull_request' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+      - name: Set up Go 1.17
+        uses: actions/setup-go@v2
+        with:
+          # TODO: Should migrate to 1.18 later
+          go-version: '1.17'
+      - name: Get dependencies
+        run: go mod tidy
+      - name: Lint code with golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.50.1
+          only-new-issues: true
   tests:
     name: Tests
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ['1.11', '1.12', '1.13', '1.14', '1.15']
+        go-version: ['1.13', '1.14', '1.15', '1.16', '1.17']
     steps:
       - name: Set up Go ${{ matrix.go-version }}
         uses: actions/setup-go@v2

.golangci.yml

@@ -0,0 +1,205 @@
+run:
+  skip-dirs-use-default: true
+  allow-parallel-runners: true
+
+output:
+  format: colored-line-number
+  sort-results: true
+
+# Linters below do not support go1.18 yet because of generics.
+# See https://github.com/golangci/golangci-lint/issues/2649
+#    - bodyclose
+#    - sqlclosecheck
+
+linters:
+  disable-all: true
+  enable:
+    - paralleltest
+    - tparallel
+    - asciicheck
+    - asasalint
+    - varnamelen
+    - reassign
+    - nilnil
+    - nilerr
+    - nakedret
+    - goprintffuncname
+    - typecheck
+    - errchkjson
+    - errcheck
+    - gosimple
+    - govet
+    - ineffassign
+    - staticcheck
+    - unused
+    - unparam
+    - dogsled
+    - dupl
+    - errorlint
+    - exhaustive
+    - exportloopref
+    - funlen
+    - gocognit
+    - goconst
+    - gocritic
+    - gocyclo
+    - godot
+    - goimports
+    - revive
+    - gosec
+    - lll
+    - makezero
+    - misspell
+    - nestif
+    - prealloc
+    - predeclared
+    - exportloopref
+    - unconvert
+    - whitespace
+
+linters-settings:
+  govet:
+    check-shadowing: false
+    disable-all: true
+    enable:
+      - assign
+      - atomic
+      - atomicalign
+      - bools
+      - buildtag
+      - copylocks
+      - fieldalignment
+      - httpresponse
+      - loopclosure
+      - lostcancel
+      - printf
+      - shift
+      - stdmethods
+      - structtag
+      - tests
+      - unmarshal
+      - unreachable
+      - unsafeptr
+    settings:
+      printf:
+        funcs:
+          - (*log.Logger).Fatal
+          - (*log.Logger).Fatalf
+          - (*log.Logger).Fatalln
+          - (*log.Logger).Panic
+          - (*log.Logger).Panicf
+          - (*log.Logger).Panicln
+          - (*log.Logger).Print
+          - (*log.Logger).Printf
+          - (*log.Logger).Println
+          - (*testing.common).Error
+          - (*testing.common).Errorf
+          - (*testing.common).Fatal
+          - (*testing.common).Fatalf
+          - (*testing.common).Log
+          - (*testing.common).Logf
+          - (*testing.common).Skip
+          - (*testing.common).Skipf
+          - (testing.TB).Error
+          - (testing.TB).Errorf
+          - (testing.TB).Fatal
+          - (testing.TB).Fatalf
+          - (testing.TB).Log
+          - (testing.TB).Logf
+          - (testing.TB).Skip
+          - (testing.TB).Skipf
+          - fmt.Errorf
+          - fmt.Fprint
+          - fmt.Fprintf
+          - fmt.Fprintln
+          - fmt.Print
+          - fmt.Printf
+          - fmt.Println
+          - fmt.Sprint
+          - fmt.Sprintf
+          - fmt.Sprintln
+          - log.Fatal
+          - log.Fatalf
+          - log.Fatalln
+          - log.Panic
+          - log.Panicf
+          - log.Panicln
+          - log.Print
+          - log.Printf
+          - log.Println
+          - runtime/trace.Logf
+  unused:
+    check-exported: false
+  unparam:
+    check-exported: false
+  dogsled:
+    max-blank-identifiers: 3
+  dupl:
+    threshold: 200
+  errorlint:
+    errorf: true
+    asserts: false
+    comparison: false
+  exhaustive:
+    check-generated: false
+    default-signifies-exhaustive: false
+  funlen:
+    lines: 90
+    statements: 40
+  gocognit:
+    min-complexity: 25
+  gocyclo:
+    min-complexity: 25
+  goimports:
+    local-prefixes: github.com/retailcrm/messenger
+  lll:
+    line-length: 120
+  misspell:
+    locale: US
+  nestif:
+    min-complexity: 4
+  whitespace:
+    multi-if: false
+    multi-func: false
+  varnamelen:
+    max-distance: 10
+    ignore-map-index-ok: true
+    ignore-type-assert-ok: true
+    ignore-chan-recv-ok: true
+    ignore-decls:
+      - t *testing.T
+      - e error
+      - i int
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - lll
+        - errcheck
+        - misspell
+        - ineffassign
+        - whitespace
+        - makezero
+        - errcheck
+        - funlen
+        - goconst
+        - gocognit
+        - gocyclo
+        - godot
+        - unused
+        - errchkjson
+        - varnamelen
+    - path: \.go
+      text: "Error return value of `io.WriteString` is not checked"
+  exclude-use-default: true
+  exclude-case-sensitive: false
+  max-issues-per-linter: 0
+  max-same-issues: 0
+  fix: true
+
+severity:
+  default-severity: error
+  case-sensitive: false
+
+service:
+  golangci-lint-version: 1.50.x

actions.go

@@ -14,13 +14,30 @@ const (
 	// ReadAction means that the event was a previous recipient reading their respective
 	// messages.
 	ReadAction
-	// PostBackAction represents post call back
+	// PostBackAction represents post call back.
 	PostBackAction
-	// OptInAction represents opting in through the Send to Messenger button
+	// OptInAction represents opting in through the Send to Messenger button.
 	OptInAction
-	// ReferralAction represents ?ref parameter in m.me URLs
+	// ReferralAction represents ?ref parameter in m.me URLs.
 	ReferralAction
 	// AccountLinkingAction means that the event concerns changes in account linking
 	// status.
 	AccountLinkingAction
 )
+
+// SenderAction is used to send a specific action (event) to the Facebook.
+// The result of sending said action is supposed to give more interactivity to the bot.
+type SenderAction string
+
+const (
+	// MarkSeen marks message as seen.
+	MarkSeen SenderAction = "MARK_SEEN"
+	// TypingOn turns on "Bot is typing..." indicator.
+	TypingOn SenderAction = "TYPING_ON"
+	// TypingOff turns off typing indicator.
+	TypingOff SenderAction = "TYPING_OFF"
+	// React to the message.
+	React SenderAction = "REACT"
+	// Unreact to the message (remove reaction).
+	Unreact SenderAction = "UNREACT"
+)

go.mod

@@ -1,8 +1,11 @@
 module github.com/retailcrm/messenger
 
+require (
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
+)
+
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.2.2
-	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
 )

message.go

@@ -33,6 +33,18 @@ type Message struct {
 	// Entities for NLP
 	// https://developers.facebook.com/docs/messenger-platform/built-in-nlp/
 	NLP json.RawMessage `json:"nlp"`
+	// Read Instagram message data to which this reply was sent to.
+	Read *IGMessageRead `json:"read,omitempty"`
+	// Reaction represents reaction to Instagram message.
+	Reaction *IGMessageReaction `json:"reaction,omitempty"`
+	// Referral with Instagram product data.
+	Referral *IGMessageReferral `json:"referral,omitempty"`
+	// IsUnsupported is being sent if Instagram message is not supported.
+	IsUnsupported bool `json:"is_unsupported,omitempty"`
+	// IsDeleted is being sent if message was deleted.
+	IsDeleted bool `json:"is_deleted,omitempty"`
+	// ReplyTo the Instagram story or to the message.
+	ReplyTo *IGReplyTo `json:"reply_to"`
 }
 
 // Delivery represents a the event fired when Facebook delivers a message to the
@@ -54,9 +66,67 @@ type Read struct {
 	RawWatermark int64 `json:"watermark"`
 	// Seq is the sequence the message was sent in.
 	Seq int `json:"seq"`
+	// Mid is the ID of the message.
+	Mid string `json:"mid"`
 }
 
-// PostBack represents postback callback
+// IGMessageRead represents data with the read message ID. Present in the Instagram webhook.
+type IGMessageRead struct {
+	// Mid is a message ID.
+	Mid string `json:"mid"`
+}
+
+// IGMessageReaction represents reaction to the Instagram message.
+type IGMessageReaction struct {
+	// Mid is a message ID.
+	Mid string `json:"mid"`
+	// Action can be {react|unreact}
+	Action ReactionAction `json:"action"`
+	// Reaction is a reaction name. Optional.
+	Reaction string `json:"reaction,omitempty"`
+	// Emoji is optional.
+	Emoji string `json:"emoji,omitempty"`
+}
+
+// IGMessageProduct represents Instagram product.
+type IGMessageProduct struct {
+	// ID of the product.
+	ID string `json:"id,omitempty"`
+}
+
+// IGMessageReferral represents Instagram message referral with ad data and product ID.
+type IGMessageReferral struct {
+	// Ad data
+	Referral
+	// Product data.
+	Product IGMessageProduct `json:"product,omitempty"`
+}
+
+// IGPostback represents Instagram postback webhook data.
+type IGPostback struct {
+	// Selected icebreaker question or title for the CTA (Generic Template)
+	Title string `json:"title,omitempty"`
+	// Payload is user defined payload.
+	Payload string `json:"payload"`
+}
+
+// IGReplyTo represents data of the thing to what reply has been sent.
+type IGReplyTo struct {
+	// Mid is a message ID to which reply was sent.
+	Mid string `json:"mid"`
+	// Story data.
+	Story *IGReplyToStory `json:"story,omitempty"`
+}
+
+// IGReplyToStory is a story data to which reply has been sent.
+type IGReplyToStory struct {
+	// URL of the story.
+	URL string `json:"url,omitempty"`
+	// ID of the story.
+	ID string `json:"id,omitempty"`
+}
+
+// PostBack represents postback callback.
 type PostBack struct {
 	// Sender is who the message was sent from.
 	Sender Sender `json:"-"`
@@ -68,6 +138,10 @@ type PostBack struct {
 	Payload string `json:"payload"`
 	// Optional referral info
 	Referral Referral `json:"referral"`
+	// Title for the CTA that was clicked on
+	Title string `json:"title"`
+	// Message ID
+	Mid string `json:"mid"`
 }
 
 type AccountLinking struct {
@@ -94,7 +168,7 @@ func (r Read) Watermark() time.Time {
 }
 
 // GetNLP simply unmarshals the NLP entities to the given struct and returns
-// an error if it's not possible
+// an error if it's not possible.
 func (m *Message) GetNLP(i interface{}) error {
 	return json.Unmarshal(m.NLP, &i)
 }

messenger.go

@@ -48,6 +48,8 @@ type Options struct {
 	WebhookURL string
 	// Mux is shared mux between several Messenger objects
 	Mux *http.ServeMux
+	// SendAPIVersion is a Send API version
+	SendAPIVersion string
 }
 
 // MessageHandler is a handler used for responding to a message containing text.
@@ -86,6 +88,7 @@ type Messenger struct {
 	verifyHandler          func(http.ResponseWriter, *http.Request)
 	verify                 bool
 	appSecret              string
+	sendAPIVersion         string
 }
 
 // New creates a new Messenger. You pass in Options in order to affect settings.
@@ -95,16 +98,21 @@ func New(mo Options) *Messenger {
 	}
 
 	m := &Messenger{
-		mux:       mo.Mux,
+		mux:            mo.Mux,
-		token:     mo.Token,
+		token:          mo.Token,
-		verify:    mo.Verify,
+		verify:         mo.Verify,
-		appSecret: mo.AppSecret,
+		appSecret:      mo.AppSecret,
+		sendAPIVersion: mo.SendAPIVersion,
 	}
 
 	if mo.WebhookURL == "" {
 		mo.WebhookURL = "/"
 	}
 
+	if m.sendAPIVersion == "" {
+		m.sendAPIVersion = DefaultSendAPIVersion
+	}
+
 	m.verifyHandler = newVerifyHandler(mo.VerifyToken)
 	m.mux.HandleFunc(mo.WebhookURL, m.handle)
 
@@ -135,17 +143,17 @@ func (m *Messenger) HandleRead(f ReadHandler) {
 	m.readHandlers = append(m.readHandlers, f)
 }
 
-// HandlePostBack adds a new PostBackHandler to the Messenger
+// HandlePostBack adds a new PostBackHandler to the Messenger.
 func (m *Messenger) HandlePostBack(f PostBackHandler) {
 	m.postBackHandlers = append(m.postBackHandlers, f)
 }
 
-// HandleReferral adds a new ReferralHandler to the Messenger
+// HandleReferral adds a new ReferralHandler to the Messenger.
 func (m *Messenger) HandleReferral(f ReferralHandler) {
 	m.referralHandlers = append(m.referralHandlers, f)
 }
 
-// HandleAccountLinking adds a new AccountLinkingHandler to the Messenger
+// HandleAccountLinking adds a new AccountLinkingHandler to the Messenger.
 func (m *Messenger) HandleAccountLinking(f AccountLinkingHandler) {
 	m.accountLinkingHandlers = append(m.accountLinkingHandlers, f)
 }
@@ -163,7 +171,7 @@ func (m *Messenger) Handler() http.Handler {
 // - Name
 // - First Name
 // - Last Name
-// - Profile Picture
+// - Profile Picture.
 func (m *Messenger) ProfileByID(id int64, profileFields []string) (Profile, error) {
 	p := Profile{}
 	url := fmt.Sprintf("%v%v", ProfileURL, id)
@@ -190,7 +198,7 @@ func (m *Messenger) ProfileByID(id int64, profileFields []string) (Profile, erro
 
 	err = json.Unmarshal(content, &p)
 	if err != nil {
-		return p, err
+		return p, NewUnmarshalError(err).WithContent(content)
 	}
 
 	if p == *new(Profile) {
@@ -204,7 +212,7 @@ func (m *Messenger) ProfileByID(id int64, profileFields []string) (Profile, erro
 	return p, err
 }
 
-// GreetingSetting sends settings for greeting
+// GreetingSetting sends settings for greeting.
 func (m *Messenger) GreetingSetting(text string) (QueryResponse, error) {
 	var qr QueryResponse
 
@@ -239,7 +247,7 @@ func (m *Messenger) GreetingSetting(text string) (QueryResponse, error) {
 	return getFacebookQueryResponse(resp.Body)
 }
 
-// CallToActionsSetting sends settings for Get Started or Persistent Menu
+// CallToActionsSetting sends settings for Get Started or Persistent Menu.
 func (m *Messenger) CallToActionsSetting(state string, actions []CallToActionsItem) (QueryResponse, error) {
 	var qr QueryResponse
 
@@ -296,7 +304,7 @@ func (m *Messenger) handle(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if rec.Object != "page" {
-		fmt.Println("Object is not page, undefined behaviour. Got", rec.Object)
+		fmt.Println("Object is not page, undefined behavior. Got", rec.Object)
 		respond(w, http.StatusUnprocessableEntity)
 		return
 	}
@@ -319,7 +327,7 @@ func respond(w http.ResponseWriter, code int) {
 	fmt.Fprintf(w, `{"code": %d, "status": "%s"}`, code, http.StatusText(code))
 }
 
-// checkIntegrity checks the integrity of the requests received
+// checkIntegrity checks the integrity of the requests received.
 func (m *Messenger) checkIntegrity(r *http.Request) error {
 	if m.appSecret == "" {
 		return xerrors.New("missing app secret")
@@ -366,8 +374,9 @@ func (m *Messenger) dispatch(r Receive) {
 			}
 
 			resp := &Response{
-				to:    Recipient{info.Sender.ID},
+				to:             Recipient{ID: info.Sender.ID},
-				token: m.token,
+				token:          m.token,
+				sendAPIVersion: m.sendAPIVersion,
 			}
 
 			switch a {
@@ -424,11 +433,12 @@ func (m *Messenger) dispatch(r Receive) {
 	}
 }
 
-// Response returns new Response object
+// Response returns new Response object.
 func (m *Messenger) Response(to int64) *Response {
 	return &Response{
-		to:    Recipient{to},
+		to:             Recipient{ID: to},
-		token: m.token,
+		token:          m.token,
+		sendAPIVersion: m.sendAPIVersion,
 	}
 }
 
@@ -437,11 +447,12 @@ func (m *Messenger) Send(to Recipient, message string, messagingType MessagingTy
 	return m.SendWithReplies(to, message, nil, messagingType, metadata, tags...)
 }
 
-// SendGeneralMessage will send the GenericTemplate message
+// SendGeneralMessage will send the GenericTemplate message.
 func (m *Messenger) SendGeneralMessage(to Recipient, elements *[]StructuredMessageElement, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	r := &Response{
-		token: m.token,
+		token:          m.token,
-		to:    to,
+		to:             to,
+		sendAPIVersion: m.sendAPIVersion,
 	}
 	return r.GenericTemplate(elements, messagingType, metadata, tags...)
 }
@@ -449,8 +460,9 @@ func (m *Messenger) SendGeneralMessage(to Recipient, elements *[]StructuredMessa
 // SendWithReplies sends a textual message to a user, but gives them the option of numerous quick response options.
 func (m *Messenger) SendWithReplies(to Recipient, message string, replies []QuickReply, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	response := &Response{
-		token: m.token,
+		token:          m.token,
-		to:    to,
+		to:             to,
+		sendAPIVersion: m.sendAPIVersion,
 	}
 
 	return response.TextWithReplies(message, replies, messagingType, metadata, tags...)
@@ -459,8 +471,9 @@ func (m *Messenger) SendWithReplies(to Recipient, message string, replies []Quic
 // Attachment sends an image, sound, video or a regular file to a given recipient.
 func (m *Messenger) Attachment(to Recipient, dataType AttachmentType, url string, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	response := &Response{
-		token: m.token,
+		token:          m.token,
-		to:    to,
+		to:             to,
+		sendAPIVersion: m.sendAPIVersion,
 	}
 
 	return response.Attachment(dataType, url, messagingType, metadata, tags...)
@@ -495,6 +508,29 @@ func (m *Messenger) EnableChatExtension(homeURL HomeURL) error {
 	return checkFacebookError(resp.Body)
 }
 
+func (m *Messenger) SenderAction(to Recipient, action SenderAction) (QueryResponse, error) {
+	response := &Response{
+		token:          m.token,
+		to:             to,
+		sendAPIVersion: m.sendAPIVersion,
+	}
+	return response.SenderAction(action)
+}
+
+func (m *Messenger) InstagramReaction(
+	to Recipient,
+	mid string,
+	action ReactionAction,
+	reaction ...string,
+) (QueryResponse, error) {
+	response := &Response{
+		token:          m.token,
+		to:             to,
+		sendAPIVersion: m.sendAPIVersion,
+	}
+	return response.InstagramReaction(mid, action, reaction...)
+}
+
 // classify determines what type of message a webhook event is.
 func (m *Messenger) classify(info MessageInfo) Action {
 	if info.Message != nil {
@@ -515,7 +551,7 @@ func (m *Messenger) classify(info MessageInfo) Action {
 	return UnknownAction
 }
 
-// newVerifyHandler returns a function which can be used to handle webhook verification
+// newVerifyHandler returns a function which can be used to handle webhook verification.
 func newVerifyHandler(token string) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if r.FormValue("hub.verify_token") == token {

messenger_test.go

@@ -106,7 +106,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp: 1543095111999,
 				Message:   &Message{},
@@ -138,7 +138,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp: 1543095111999,
 				Delivery:  &Delivery{},
@@ -170,7 +170,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp: 1543095111999,
 				Read:      &Read{},
@@ -205,7 +205,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp: 1543095111999,
 				PostBack:  &PostBack{},
@@ -240,7 +240,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp: 1543095111999,
 				OptIn:     &OptIn{},
@@ -275,7 +275,7 @@ func TestMessenger_Dispatch(t *testing.T) {
 		messages := []MessageInfo{
 			{
 				Sender:    Sender{111},
-				Recipient: Recipient{222},
+				Recipient: Recipient{ID: 222},
 				// 2018-11-24 21:31:51 UTC + 999ms
 				Timestamp:       1543095111999,
 				ReferralMessage: &ReferralMessage{},

profile.go

@@ -1,6 +1,6 @@
 package messenger
 
-// Profile is the public information of a Facebook user
+// Profile is the public information of a Facebook user.
 type Profile struct {
 	Name          string  `json:"name"`
 	FirstName     string  `json:"first_name"`

receiving.go

@@ -35,6 +35,8 @@ type MessageInfo struct {
 	// Delivery is the contents of a message if it is a DeliveryAction.
 	// Nil if it is not a DeliveryAction.
 	Delivery *Delivery `json:"delivery"`
+	// Reaction represents reaction to Instagram message.
+	Reaction *IGMessageReaction `json:"reaction,omitempty"`
 
 	PostBack *PostBack `json:"postback"`
 
@@ -58,7 +60,7 @@ type OptIn struct {
 	Ref string `json:"ref"`
 }
 
-// ReferralMessage represents referral endpoint
+// ReferralMessage represents referral endpoint.
 type ReferralMessage struct {
 	*Referral
 
@@ -70,7 +72,7 @@ type ReferralMessage struct {
 	Time time.Time `json:"-"`
 }
 
-// Referral represents referral info
+// Referral represents referral info.
 type Referral struct {
 	// Data originally passed in the ref param
 	Ref string `json:"ref"`
@@ -78,6 +80,26 @@ type Referral struct {
 	Source string `json:"source"`
 	// The identifier dor the referral
 	Type string `json:"type"`
+	// ID of the ad
+	AdID string `json:"ad_id,omitempty"`
+	// The data containing information about the CTM ad, the user initiated the thread from.
+	AdsContextData AdsContextData `json:"ads_context_data,omitempty"`
+	// URI of the site from which the message was sent to the Facebook chat plugin.
+	RefererURI string `json:"referer_uri,omitempty"`
+}
+
+// AdsContextData represents data containing information about the CTM ad, the user initiated the thread from.
+type AdsContextData struct {
+	// Title of the Ad
+	AdTitle string `json:"ad_title"`
+	// Url of the image from the Ad the user is interested
+	PhotoURL string `json:"photo_url,omitempty"`
+	// Thumbnail url of the video from the ad
+	VideoURL string `json:"video_url,omitempty"`
+	// ID of the post
+	PostID string `json:"post_id"`
+	// Product ID from the Ad the user is interested
+	ProductID string `json:"product_id,omitempty"`
 }
 
 // Sender is who the message was sent from.
@@ -87,7 +109,9 @@ type Sender struct {
 
 // Recipient is who the message was sent to.
 type Recipient struct {
-	ID int64 `json:"id,string"`
+	ID        int64  `json:"id,string,omitempty"`
+	PostID    string `json:"post_id,omitempty"`
+	CommentID string `json:"comment_id,omitempty"`
 }
 
 // Attachment is a file which used in a message.
@@ -112,13 +136,26 @@ type QuickReply struct {
 
 // Payload is the information on where an attachment is.
 type Payload struct {
-	URL string `json:"url,omitempty"`
+	URL   string `json:"url,omitempty"`
 	Title string `json:"title,omitempty"`
 	// Coordinates is Lat/Long pair of location pin
-	Coordinates *Coordinates `json:"coordinates,omitempty"`
+	Coordinates  *Coordinates `json:"coordinates,omitempty"`
+	TemplateType string       `json:"template_type,omitempty"`
+	Buttons      []Button     `json:"buttons,omitempty"`
 }
 
-// Coordinates is a pair of latitude and longitude
+type Button struct {
+	Type                string `json:"type,omitempty"`
+	Title               string `json:"title,omitempty"`
+	Payload             string `json:"payload,omitempty"`
+	URL                 string `json:"url,omitempty"`
+	WebviewHeightRatio  string `json:"webview_height_ratio,omitempty"`
+	MessengerExtensions bool   `json:"messenger_extensions,omitempty"`
+	FallbackURL         string `json:"fallback_url,omitempty"`
+	WebviewShareButton  string `json:"webview_share_button,omitempty"`
+}
+
+// Coordinates is a pair of latitude and longitude.
 type Coordinates struct {
 	// Lat is latitude
 	Lat float64 `json:"lat"`

response.go

@@ -23,10 +23,12 @@ type TopElementStyle string
 type ImageAspectRatio string
 
 const (
+	// DefaultSendAPIVersion is a default Send API version
+	DefaultSendAPIVersion = "v2.11"
 	// SendMessageURL is API endpoint for sending messages.
-	SendMessageURL = "https://graph.facebook.com/v2.11/me/messages"
+	SendMessageURL = "https://graph.facebook.com/%s/me/messages"
 	// ThreadControlURL is the API endpoint for passing thread control.
-	ThreadControlURL = "https://graph.facebook.com/v2.6/me/pass_thread_control"
+	ThreadControlURL = "https://graph.facebook.com/%s/me/pass_thread_control"
 	// InboxPageID is managed by facebook for secondary pass to inbox features: https://developers.facebook.com/docs/messenger-platform/handover-protocol/pass-thread-control
 	InboxPageID = 263902037430900
 
@@ -39,13 +41,13 @@ const (
 	// FileAttachment is file attachment type.
 	FileAttachment AttachmentType = "file"
 
-	// ResponseType is response messaging type
+	// ResponseType is response messaging type.
 	ResponseType MessagingType = "RESPONSE"
-	// UpdateType is update messaging type
+	// UpdateType is update messaging type.
 	UpdateType MessagingType = "UPDATE"
-	// MessageTagType is message_tag messaging type
+	// MessageTagType is message_tag messaging type.
 	MessageTagType MessagingType = "MESSAGE_TAG"
-	// NonPromotionalSubscriptionType is NON_PROMOTIONAL_SUBSCRIPTION messaging type
+	// NonPromotionalSubscriptionType is NON_PROMOTIONAL_SUBSCRIPTION messaging type.
 	NonPromotionalSubscriptionType MessagingType = "NON_PROMOTIONAL_SUBSCRIPTION"
 
 	// TopElementStyle is compact.
@@ -60,14 +62,14 @@ const (
 )
 
 // QueryResponse is the response sent back by Facebook when setting up things
-// like greetings or call-to-actions
+// like greetings or call-to-actions.
 type QueryResponse struct {
 	Error       *QueryError `json:"error,omitempty"`
 	RecipientID string      `json:"recipient_id"`
 	MessageID   string      `json:"message_id"`
 }
 
-// QueryError is representing an error sent back by Facebook
+// QueryError is representing an error sent back by Facebook.
 type QueryError struct {
 	Message      string `json:"message"`
 	Type         string `json:"type"`
@@ -76,7 +78,7 @@ type QueryError struct {
 	FBTraceID    string `json:"fbtrace_id"`
 }
 
-// QueryError implements error
+// QueryError implements error.
 func (e QueryError) Error() string {
 	return e.Message
 }
@@ -85,9 +87,10 @@ func checkFacebookError(r io.Reader) error {
 	var err error
 
 	qr := QueryResponse{}
-	err = json.NewDecoder(r).Decode(&qr)
+	decoder := json.NewDecoder(r)
+	err = decoder.Decode(&qr)
 	if err != nil {
-		return xerrors.Errorf("json unmarshal error: %w", err)
+		return NewUnmarshalError(err).WithReader(decoder.Buffered())
 	}
 	if qr.Error != nil {
 		return xerrors.Errorf("facebook error: %w", qr.Error)
@@ -98,9 +101,9 @@ func checkFacebookError(r io.Reader) error {
 
 func getFacebookQueryResponse(r io.Reader) (QueryResponse, error) {
 	qr := QueryResponse{}
-	err := json.NewDecoder(r).Decode(&qr)
+	decoder := json.NewDecoder(r)
-	if err != nil {
+	if err := decoder.Decode(&qr); err != nil {
-		return qr, xerrors.Errorf("json unmarshal error: %w", err)
+		return qr, NewUnmarshalError(err).WithReader(decoder.Buffered())
 	}
 	if qr.Error != nil {
 		return qr, xerrors.Errorf("facebook error: %w", qr.Error)
@@ -110,8 +113,9 @@ func getFacebookQueryResponse(r io.Reader) (QueryResponse, error) {
 
 // Response is used for responding to events with messages.
 type Response struct {
-	token string
+	token          string
-	to    Recipient
+	to             Recipient
+	sendAPIVersion string
 }
 
 // SetToken is for using DispatchMessage from outside.
@@ -126,7 +130,8 @@ func (r *Response) Text(message string, messagingType MessagingType, metadata st
 
 // TextWithReplies sends a textual message with some replies
 // messagingType should be one of the following: "RESPONSE","UPDATE","MESSAGE_TAG","NON_PROMOTIONAL_SUBSCRIPTION"
-// only supply tags when messagingType == "MESSAGE_TAG" (see https://developers.facebook.com/docs/messenger-platform/send-messages#messaging_types for more)
+// only supply tags when messagingType == "MESSAGE_TAG"
+// (see https://developers.facebook.com/docs/messenger-platform/send-messages#messaging_types for more).
 func (r *Response) TextWithReplies(message string, replies []QuickReply, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	var tag string
 	if len(tags) > 0 {
@@ -147,7 +152,7 @@ func (r *Response) TextWithReplies(message string, replies []QuickReply, messagi
 	return r.DispatchMessage(&m)
 }
 
-// AttachmentWithReplies sends a attachment message with some replies
+// AttachmentWithReplies sends a attachment message with some replies.
 func (r *Response) AttachmentWithReplies(attachment *StructuredMessageAttachment, replies []QuickReply, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	var tag string
 	if len(tags) > 0 {
@@ -177,7 +182,7 @@ func (r *Response) Image(im image.Image) (QueryResponse, error) {
 		return qr, err
 	}
 
-	return r.AttachmentData(ImageAttachment, "meme.jpg", imageBytes)
+	return r.AttachmentData(ImageAttachment, "meme.jpg", "image/jpeg", imageBytes)
 }
 
 // Attachment sends an image, sound, video or a regular file to a chat.
@@ -204,15 +209,15 @@ func (r *Response) Attachment(dataType AttachmentType, url string, messagingType
 	return r.DispatchMessage(&m)
 }
 
-// copied from multipart package
+// copied from multipart package.
 var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
 
-// copied from multipart package
+// copied from multipart package.
 func escapeQuotes(s string) string {
 	return quoteEscaper.Replace(s)
 }
 
-// copied from multipart package with slight changes due to fixed content-type there
+// copied from multipart package with slight changes due to fixed content-type there.
 func createFormFile(filename string, w *multipart.Writer, contentType string) (io.Writer, error) {
 	h := make(textproto.MIMEHeader)
 	h.Set("Content-Disposition",
@@ -223,15 +228,14 @@ func createFormFile(filename string, w *multipart.Writer, contentType string) (i
 }
 
 // AttachmentData sends an image, sound, video or a regular file to a chat via an io.Reader.
-func (r *Response) AttachmentData(dataType AttachmentType, filename string, filedata io.Reader) (QueryResponse, error) {
+func (r *Response) AttachmentData(
+	dataType AttachmentType, filename string, contentType string, filedata io.Reader) (QueryResponse, error) {
 	var qr QueryResponse
 
 	filedataBytes, err := ioutil.ReadAll(filedata)
 	if err != nil {
 		return qr, err
 	}
-	contentType := http.DetectContentType(filedataBytes[:512])
-	fmt.Println("Content-type detected:", contentType)
 
 	var body bytes.Buffer
 	multipartWriter := multipart.NewWriter(&body)
@@ -248,7 +252,7 @@ func (r *Response) AttachmentData(dataType AttachmentType, filename string, file
 	multipartWriter.WriteField("recipient", fmt.Sprintf(`{"id":"%v"}`, r.to.ID))
 	multipartWriter.WriteField("message", fmt.Sprintf(`{"attachment":{"type":"%v", "payload":{}}}`, dataType))
 
-	req, err := http.NewRequest("POST", SendMessageURL, &body)
+	req, err := http.NewRequest("POST", fmt.Sprintf(SendMessageURL, r.sendAPIVersion), &body)
 	if err != nil {
 		return qr, err
 	}
@@ -267,7 +271,7 @@ func (r *Response) AttachmentData(dataType AttachmentType, filename string, file
 	return getFacebookQueryResponse(resp.Body)
 }
 
-// ButtonTemplate sends a message with the main contents being button elements
+// ButtonTemplate sends a message with the main contents being button elements.
 func (r *Response) ButtonTemplate(text string, buttons *[]StructuredMessageButton, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	var tag string
 	if len(tags) > 0 {
@@ -295,7 +299,7 @@ func (r *Response) ButtonTemplate(text string, buttons *[]StructuredMessageButto
 	return r.DispatchMessage(&m)
 }
 
-// GenericTemplate is a message which allows for structural elements to be sent
+// GenericTemplate is a message which allows for structural elements to be sent.
 func (r *Response) GenericTemplate(elements *[]StructuredMessageElement, messagingType MessagingType, metadata string, tags ...string) (QueryResponse, error) {
 	var tag string
 	if len(tags) > 0 {
@@ -321,7 +325,7 @@ func (r *Response) GenericTemplate(elements *[]StructuredMessageElement, messagi
 	return r.DispatchMessage(&m)
 }
 
-// ListTemplate sends a list of elements
+// ListTemplate sends a list of elements.
 func (r *Response) ListTemplate(elements *[]StructuredMessageElement, messagingType MessagingType, tags ...string) (QueryResponse, error) {
 	var tag string
 	if len(tags) > 0 {
@@ -347,8 +351,8 @@ func (r *Response) ListTemplate(elements *[]StructuredMessageElement, messagingT
 	return r.DispatchMessage(&m)
 }
 
-// SenderAction sends a info about sender action
+// SenderAction sends an info about sender action.
-func (r *Response) SenderAction(action string) (QueryResponse, error) {
+func (r *Response) SenderAction(action SenderAction) (QueryResponse, error) {
 	m := SendSenderAction{
 		Recipient:    r.to,
 		SenderAction: action,
@@ -356,7 +360,22 @@ func (r *Response) SenderAction(action string) (QueryResponse, error) {
 	return r.DispatchMessage(&m)
 }
 
-// DispatchMessage posts the message to messenger, return the error if there's any
+// InstagramReaction sends an info about Instagram reaction.
+func (r *Response) InstagramReaction(mid string, action ReactionAction, reaction ...string) (QueryResponse, error) {
+	m := SendInstagramReaction{
+		Recipient:    r.to,
+		SenderAction: action,
+		Payload: SenderInstagramReactionPayload{
+			MessageID: mid,
+		},
+	}
+	if len(reaction) > 0 {
+		m.Payload.Reaction = reaction[0]
+	}
+	return r.DispatchMessage(&m)
+}
+
+// DispatchMessage posts the message to messenger, return the error if there's any.
 func (r *Response) DispatchMessage(m interface{}) (QueryResponse, error) {
 	var res QueryResponse
 	data, err := json.Marshal(m)
@@ -364,7 +383,7 @@ func (r *Response) DispatchMessage(m interface{}) (QueryResponse, error) {
 		return res, err
 	}
 
-	req, err := http.NewRequest("POST", SendMessageURL, bytes.NewBuffer(data))
+	req, err := http.NewRequest("POST", fmt.Sprintf(SendMessageURL, r.sendAPIVersion), bytes.NewBuffer(data))
 	if err != nil {
 		return res, err
 	}
@@ -396,7 +415,7 @@ func (r *Response) PassThreadToInbox() error {
 		return err
 	}
 
-	req, err := http.NewRequest("POST", ThreadControlURL, bytes.NewBuffer(data))
+	req, err := http.NewRequest("POST", fmt.Sprintf(ThreadControlURL, r.sendAPIVersion), bytes.NewBuffer(data))
 	if err != nil {
 		return err
 	}
@@ -453,7 +472,7 @@ type StructuredMessageAttachment struct {
 	Payload StructuredMessagePayload `json:"payload"`
 }
 
-// StructuredMessagePayload is the actual payload of an attachment
+// StructuredMessagePayload is the actual payload of an attachment.
 type StructuredMessagePayload struct {
 	// TemplateType must be button, generic or receipt
 	TemplateType     string                      `json:"template_type,omitempty"`
@@ -500,14 +519,14 @@ type Adjustment struct {
 	Amount float32 `json:"amount,omitempty"`
 }
 
-// StructuredMessageElement is a response containing structural elements
+// StructuredMessageElement is a response containing structural elements.
 type StructuredMessageElement struct {
-	Title         string                    `json:"title"`
+	Title         string                     `json:"title"`
-	ImageURL      string                    `json:"image_url"`
+	ImageURL      string                     `json:"image_url"`
-	ItemURL       string                    `json:"item_url,omitempty"`
+	ItemURL       string                     `json:"item_url,omitempty"`
-	Subtitle      string                    `json:"subtitle"`
+	Subtitle      string                     `json:"subtitle"`
-	DefaultAction *DefaultAction            `json:"default_action,omitempty"`
+	DefaultAction *DefaultAction             `json:"default_action,omitempty"`
-	Buttons       []StructuredMessageButton `json:"buttons"`
+	Buttons       *[]StructuredMessageButton `json:"buttons,omitempty"`
 	ReceiptMessageElement
 }
 
@@ -517,7 +536,7 @@ type ReceiptMessageElement struct {
 	Currency string  `json:"currency,omitempty"`
 }
 
-// DefaultAction is a response containing default action properties
+// DefaultAction is a response containing default action properties.
 type DefaultAction struct {
 	Type                string `json:"type"`
 	URL                 string `json:"url,omitempty"`
@@ -527,7 +546,7 @@ type DefaultAction struct {
 	WebviewShareButton  string `json:"webview_share_button,omitempty"`
 }
 
-// StructuredMessageButton is a response containing buttons
+// StructuredMessageButton is a response containing buttons.
 type StructuredMessageButton struct {
 	Type                string                 `json:"type"`
 	URL                 string                 `json:"url,omitempty"`
@@ -540,8 +559,31 @@ type StructuredMessageButton struct {
 	ShareContents       *StructuredMessageData `json:"share_contents,omitempty"`
 }
 
-// SendSenderAction is the information about sender action
+// SendSenderAction is the information about sender action.
 type SendSenderAction struct {
-	Recipient    Recipient `json:"recipient"`
+	Recipient    Recipient    `json:"recipient"`
-	SenderAction string    `json:"sender_action"`
+	SenderAction SenderAction `json:"sender_action"`
+}
+
+// ReactionAction contains info about reaction action type.
+type ReactionAction string
+
+const (
+	// ReactionActionReact is used when user added a reaction.
+	ReactionActionReact ReactionAction = "react"
+	// ReactionActionUnReact is used when user removed a reaction.
+	ReactionActionUnReact ReactionAction = "unreact"
+)
+
+// SendInstagramReaction is the information about sender action.
+type SendInstagramReaction struct {
+	Recipient    Recipient                      `json:"recipient"`
+	SenderAction ReactionAction                 `json:"sender_action"`
+	Payload      SenderInstagramReactionPayload `json:"payload"`
+}
+
+// SenderInstagramReactionPayload contains target message ID and reaction name.
+type SenderInstagramReactionPayload struct {
+	MessageID string `json:"message_id"`
+	Reaction  string `json:"reaction"`
 }

response_test.go

@@ -0,0 +1,33 @@
+package messenger
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_MarshalStructuredMessageElement(t *testing.T) {
+	data, err := json.Marshal(StructuredMessageElement{
+		Title: "Title",
+	})
+	require.NoError(t, err)
+	assert.JSONEq(t, string(data), `{"image_url":"", "subtitle":"", "title": "Title"}`)
+}
+
+func TestResponse_checkFacebookError_UnmarshalError(t *testing.T) {
+	r := bytes.NewReader([]byte("test error text"))
+	err := checkFacebookError(r)
+	assert.True(t, errors.Is(err, ErrUnmarshal))
+	assert.Contains(t, err.Error(), "test error text")
+}
+
+func TestResponse_getFacebookQueryResponse_UnmarshalError(t *testing.T) {
+	r := bytes.NewReader([]byte("test error text"))
+	_, err := getFacebookQueryResponse(r)
+	assert.True(t, errors.Is(err, ErrUnmarshal))
+	assert.Contains(t, err.Error(), "test error text")
+}

settings.go

@@ -17,25 +17,25 @@ const (
 	WebviewFull = "full"
 )
 
-// GreetingSetting is the setting for greeting message
+// GreetingSetting is the setting for greeting message.
 type GreetingSetting struct {
 	SettingType string       `json:"setting_type"`
 	Greeting    GreetingInfo `json:"greeting"`
 }
 
-// GreetingInfo contains greeting message
+// GreetingInfo contains greeting message.
 type GreetingInfo struct {
 	Text string `json:"text"`
 }
 
-// CallToActionsSetting is the settings for Get Started and Persist Menu
+// 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
+// CallToActionsItem contains Get Started button or item of Persist Menu.
 type CallToActionsItem struct {
 	Type               string `json:"type,omitempty"`
 	Title              string `json:"title,omitempty"`

unmarshal_error.go

@@ -0,0 +1,47 @@
+package messenger
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+)
+
+var ErrUnmarshal = errors.New("unmarshal error")
+
+type UnmarshalError struct {
+	Content   []byte
+	ErrorText string
+	Err       error
+}
+
+func (u *UnmarshalError) Error() string {
+	return fmt.Sprintf("can not unmarshal content: %s; error: %s", string(u.Content), u.ErrorText)
+}
+
+func (u *UnmarshalError) Unwrap() error {
+	return u.Err
+}
+
+func NewUnmarshalError(err error) *UnmarshalError {
+	return &UnmarshalError{
+		Err:       ErrUnmarshal,
+		ErrorText: err.Error(),
+	}
+}
+
+func (u *UnmarshalError) WithReader(reader io.Reader) *UnmarshalError {
+	content, _ := ioutil.ReadAll(reader)
+	u.Content = content
+	return u
+}
+
+func (u *UnmarshalError) WithContent(content []byte) *UnmarshalError {
+	u.Content = content
+	return u
+}
+
+func (u *UnmarshalError) WithErr(err error) *UnmarshalError {
+	u.Err = err
+	return u
+}

unmarshal_error_test.go

@@ -0,0 +1,57 @@
+package messenger
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewUnmarshalError(t *testing.T) {
+	err := errors.New("some error")
+	unmarshalError := NewUnmarshalError(err)
+	assert.True(t, errors.Is(unmarshalError, ErrUnmarshal))
+}
+
+func TestUnmarshalError_Error(t *testing.T) {
+	err := errors.New("some error")
+	content := []byte("test content")
+	actual := NewUnmarshalError(err).WithContent(content).Error()
+	expected := "can not unmarshal content: test content; error: some error"
+	assert.Equal(t, expected, actual)
+}
+
+func TestUnmarshalError_Unwrap(t *testing.T) {
+	err := errors.New("some error")
+	actual := NewUnmarshalError(err).Unwrap()
+	expected := ErrUnmarshal
+	assert.Equal(t, expected, actual)
+}
+
+func TestUnmarshalError_WithContent(t *testing.T) {
+	err := errors.New("some error")
+	content := []byte("test content")
+
+	actual := NewUnmarshalError(err).WithContent(content)
+	expected := &UnmarshalError{Err: ErrUnmarshal, Content: content, ErrorText: err.Error()}
+	assert.Equal(t, expected, actual)
+}
+
+func TestUnmarshalError_WithReader(t *testing.T) {
+	err := errors.New("some error")
+	content := []byte("test content")
+	reader := bytes.NewReader(content)
+
+	actual := NewUnmarshalError(err).WithReader(reader)
+	expected := &UnmarshalError{Err: ErrUnmarshal, Content: content, ErrorText: err.Error()}
+	assert.Equal(t, expected, actual)
+}
+
+func TestUnmarshalError_WithErr(t *testing.T) {
+	someError := errors.New("some error")
+	otherError := errors.New("other error")
+	actual := NewUnmarshalError(someError).WithErr(otherError)
+	expected := &UnmarshalError{Err: otherError, ErrorText: someError.Error()}
+	assert.Equal(t, expected, actual)
+}