Add support new version of Slack applocation

- Added support of Event API in socketMode
- Fix files upload for new applications

bridge/config/config.go

@@ -163,6 +163,7 @@ type Protocol struct {
 	TeamID                 string     // msteams
 	TenantID               string     // msteams
 	Token                  string     // gitter, slack, discord, api, matrix
+	AppToken               string     // slack
 	Topic                  string     // zulip
 	URL                    string     // mattermost, slack // DEPRECATED
 	UseAPI                 bool       // mattermost, slack

bridge/slack/handlers.go

@@ -9,6 +9,9 @@ import (
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/42wim/matterbridge/bridge/helper"
 	"github.com/slack-go/slack"
+	"github.com/slack-go/slack/socketmode"
+	"github.com/slack-go/slack/slackevents"
+	"encoding/json"
 )
 
 // ErrEventIgnored is for events that should be ignored
@@ -19,6 +22,9 @@ func (b *Bslack) handleSlack() {
 	if b.GetString(incomingWebhookConfig) != "" && b.GetString(tokenConfig) == "" {
 		b.Log.Debugf("Choosing webhooks based receiving")
 		go b.handleMatterHook(messages)
+	} else if b.GetString(appTokenConfig) != "" && b.GetString(tokenConfig) != "" {
+		b.Log.Debugf("Choosing socket mode based receiving")
+		go b.handleSlackClientSocketMode(messages)
 	} else {
 		b.Log.Debugf("Choosing token based receiving")
 		go b.handleSlackClient(messages)
@@ -47,6 +53,135 @@ func (b *Bslack) handleSlack() {
 	}
 }
 
+func (b *Bslack) handleSlackClientSocketMode(messages chan *config.Message) {
+
+	for evt := range b.smc.Events {
+		switch evt.Type {
+		case socketmode.EventTypeConnecting:
+			b.Log.Debug("Connecting to Slack with Socket Mode...")
+		case socketmode.EventTypeConnectionError:
+			b.Log.Debug("Connection failed. Retrying later...")
+		case socketmode.EventTypeConnected:
+			b.Log.Debug("Connected to Slack with Socket Mode.")
+			if info, err := b.rtm.AuthTest(); err == nil {
+				b.si = &slack.Info {
+					User: &slack.UserDetails{
+						ID: info.UserID,
+						Name: info.User,
+					},
+					Team: &slack.Team{
+						ID: info.TeamID,
+						Name: info.Team,
+					},
+				}
+				b.channels.populateChannels(true)
+				b.users.populateUsers(true)
+			} else {
+				b.Log.Fatalf("Get user info error %+v", err)
+			}
+		case socketmode.EventTypeEventsAPI:
+			eventsAPIEvent, ok := evt.Data.(slackevents.EventsAPIEvent)
+			if !ok {
+				b.Log.Printf("Ignored %+v\n", evt)
+				continue
+			}
+
+			b.smc.Ack(*evt.Request)
+
+			switch eventsAPIEvent.Type {
+			case slackevents.CallbackEvent:
+				innerEvent := eventsAPIEvent.InnerEvent
+				// b.Log.Debugf("Event received %+v", innerEvent)
+				switch ev := innerEvent.Data.(type) {
+				case *slackevents.MessageEvent:
+					// Workaround for handler compability
+					evString, _ := json.Marshal(ev)
+					b.Log.Debugf("Message event: %s", evString)
+					slackEvent := &slack.MessageEvent{}
+					if err := json.Unmarshal(evString, &slackEvent); err != nil {
+						b.Log.Errorf("Skipped message: %#v", err)
+						continue
+					}
+
+					if b.skipMessageEvent(slackEvent) {
+						b.Log.Debugf("Skipped message: %#v", slackEvent)
+						continue
+					}
+					rmsg, err := b.handleMessageEvent(slackEvent)
+					if err != nil {
+						b.Log.Errorf("%#v", err)
+						continue
+					}
+					messages <- rmsg
+				case *slackevents.FileDeletedEvent:
+					slackEvent := &slack.FileDeletedEvent{
+						Type: ev.Type,
+						EventTimestamp: ev.EventTimestamp,
+						FileID: ev.FileID,
+					}
+					rmsg, err := b.handleFileDeletedEvent(slackEvent)
+					if err != nil {
+						b.Log.Printf("%#v", err)
+						continue
+					}
+					messages <- rmsg
+				case *slackevents.MemberJoinedChannelEvent:
+					b.users.populateUser(ev.User)
+				case *slackevents.UserProfileChangedEvent:
+					b.users.invalidateUser(ev.User.ID)
+
+				// TODO not implemented
+				// case *slack.ChannelJoinedEvent:
+				// 	// When we join a channel we update the full list of users as
+				// 	// well as the information for the channel that we joined as this
+				// 	// should now tell that we are a member of it.
+				// 	b.channels.registerChannel(ev.Channel)
+
+				case *slackevents.AppMentionEvent:
+				default:
+					b.Log.Debugf("Unhandled incoming event: %T", ev)
+				}
+			default:
+				b.Log.Printf("Unsupported Events API event received: %+v", eventsAPIEvent.Type)
+			}
+		case socketmode.EventTypeInteractive:
+			callback, ok := evt.Data.(slack.InteractionCallback)
+			if !ok {
+				b.Log.Printf("Ignored %+v\n", evt)
+				continue
+			}
+
+			b.Log.Debugf("Interaction skipped:  %+v\n", callback)
+
+			var payload interface{}
+
+			switch callback.Type {
+			case slack.InteractionTypeBlockActions:
+			case slack.InteractionTypeShortcut:
+			case slack.InteractionTypeViewSubmission:
+			case slack.InteractionTypeDialogSubmission:
+			default:
+
+			}
+
+			b.smc.Ack(*evt.Request, payload)
+		case socketmode.EventTypeSlashCommand:
+			cmd, ok := evt.Data.(slack.SlashCommand)
+			if !ok {
+				b.Log.Printf("Ignored %+v\n", evt)
+			} else {
+				b.Log.Debugf("Slash command skipped: %+v", cmd)
+			}
+			var payload interface{}
+			b.smc.Ack(*evt.Request, payload)
+		case "hello":
+			continue
+		default:
+			b.Log.Errorf("Unexpected event type received: %s\n", evt.Type)
+		}
+	}
+}
+
 func (b *Bslack) handleSlackClient(messages chan *config.Message) {
 	for msg := range b.rtm.IncomingEvents {
 		if msg.Type != sUserTyping && msg.Type != sHello && msg.Type != sLatencyReport {

bridge/slack/slack.go

@@ -15,6 +15,7 @@ import (
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/rs/xid"
 	"github.com/slack-go/slack"
+	"github.com/slack-go/slack/socketmode"
 )
 
 type Bslack struct {
@@ -24,6 +25,7 @@ type Bslack struct {
 	mh  *matterhook.Client
 	sc  *slack.Client
 	rtm *slack.RTM
+	smc *socketmode.Client
 	si  *slack.Info
 
 	cache        *lru.Cache
@@ -57,6 +59,7 @@ const (
 	cfileDownloadChannel = "file_download_channel"
 
 	tokenConfig           = "Token"
+	appTokenConfig        = "AppToken"
 	incomingWebhookConfig = "WebhookBindAddress"
 	outgoingWebhookConfig = "WebhookURL"
 	skipTLSConfig         = "SkipTLSVerify"
@@ -109,14 +112,26 @@ func (b *Bslack) Connect() error {
 	if token := b.GetString(tokenConfig); token != "" {
 		b.Log.Info("Connecting using token")
 
-		b.sc = slack.New(token, slack.OptionDebug(b.GetBool("Debug")))
+		appToken := b.GetString(appTokenConfig)
+		b.sc = slack.New(token, slack.OptionDebug(b.GetBool("Debug")), slack.OptionAppLevelToken(appToken))
 
 		b.channels = newChannelManager(b.Log, b.sc)
 		b.users = newUserManager(b.Log, b.sc)
 
 		b.rtm = b.sc.NewRTM()
-		go b.rtm.ManageConnection()
+
+		if appToken != "" {
+			b.smc = socketmode.New(
+				b.sc,
+				socketmode.OptionDebug(b.GetBool("Debug")),
+			)
+		} else {
+			go b.rtm.ManageConnection()
+		}
 		go b.handleSlack()
+		if b.smc != nil {
+			go b.smc.Run()
+		}
 		return nil
 	}
 
@@ -457,35 +472,60 @@ func (b *Bslack) uploadFile(msg *config.Message, channelID string) (string, erro
 		// Because the result of the UploadFile is slower than the MessageEvent from slack
 		// we can't match on the file ID yet, so we have to match on the filename too.
 		ts := time.Now()
-		b.Log.Debugf("Adding file %s to cache at %s with timestamp", fi.Name, ts.String())
+		fSize := int(fi.Size)
+		if fSize == 0 {
+			fSize = len(*fi.Data)
+		}
+		b.Log.Debugf("Adding file %s to cache at %s with timestamp, size %d", fi.Name, ts.String(), fSize)
 		b.cache.Add("filename"+fi.Name, ts)
 		initialComment := fmt.Sprintf("File from %s", msg.Username)
 		if fi.Comment != "" {
 			initialComment += fmt.Sprintf(" with comment: %s", fi.Comment)
 		}
-		res, err := b.sc.UploadFile(slack.FileUploadParameters{
-			Reader:          bytes.NewReader(*fi.Data),
-			Filename:        fi.Name,
-			Channels:        []string{channelID},
-			InitialComment:  initialComment,
-			ThreadTimestamp: msg.ParentID,
-		})
-		if err != nil {
-			b.Log.Errorf("uploadfile %#v", err)
-			return "", err
-		}
-		if res.ID != "" {
-			b.Log.Debugf("Adding file ID %s to cache with timestamp %s", res.ID, ts.String())
-			b.cache.Add("file"+res.ID, ts)
 
-			// search for message id by uploaded file in private/public channels, get thread timestamp from uploaded file
+		if b.smc != nil {
-			if v, ok := res.Shares.Private[channelID]; ok && len(v) > 0 {
+			res, err := b.sc.UploadFileV2(slack.UploadFileV2Parameters{
-				messageID = v[0].Ts
+				Reader:          bytes.NewReader(*fi.Data),
+				Filename:        fi.Name,
+				FileSize:        fSize,
+				Channel:         channelID,
+				InitialComment:  initialComment,
+				ThreadTimestamp: msg.ParentID,
+			})
+			if err != nil {
+				b.Log.Errorf("uploadfile %#v", err)
+				return "", err
 			}
-			if v, ok := res.Shares.Public[channelID]; ok && len(v) > 0 {
+			if res.ID != "" {
-				messageID = v[0].Ts
+				b.Log.Debugf("Adding file ID %s to cache with timestamp %s", res.ID, ts.String())
+				b.cache.Add("file"+res.ID, ts)
+				messageID = res.ID // TODO
+			}
+		} else { // Deprecated version
+			res, err := b.sc.UploadFile(slack.FileUploadParameters{
+				Reader:          bytes.NewReader(*fi.Data),
+				Filename:        fi.Name,
+				Channels:        []string{channelID},
+				InitialComment:  initialComment,
+				ThreadTimestamp: msg.ParentID,
+			})
+			if err != nil {
+				b.Log.Errorf("uploadfile %#v", err)
+				return "", err
+			}
+			if res.ID != "" {
+				b.Log.Debugf("Adding file ID %s to cache with timestamp %s", res.ID, ts.String())
+				b.cache.Add("file"+res.ID, ts)
+				// search for message id by uploaded file in private/public channels, get thread timestamp from uploaded file
+				if v, ok := res.Shares.Private[channelID]; ok && len(v) > 0 {
+					messageID = v[0].Ts
+				}
+				if v, ok := res.Shares.Public[channelID]; ok && len(v) > 0 {
+					messageID = v[0].Ts
+				}
 			}
 		}
+
 	}
 	return messageID, nil
 }

matterbridge.toml.sample

@@ -644,6 +644,11 @@ PreserveThreading=false
 #Use https://api.slack.com/custom-integrations/legacy-tokens
 #REQUIRED (when not using webhooks)
 Token="yourslacktoken"
+#Socket mode token to use modern application API (Events API + socket mode)
+#See https://github.com/42wim/matterbridge/issues/2159
+#REQUIRED (when not using webhooks or legacy application)
+#AppToken="yourslackapptoken"
+
 
 #Extra slack specific debug info, warning this generates a lot of output.
 #OPTIONAL (default false)

vendor/github.com/slack-go/slack/slackevents/action_events.go

@@ -0,0 +1,36 @@
+package slackevents
+
+import (
+	"encoding/json"
+
+	"github.com/slack-go/slack"
+)
+
+type MessageActionResponse struct {
+	ResponseType    string `json:"response_type"`
+	ReplaceOriginal bool   `json:"replace_original"`
+	Text            string `json:"text"`
+}
+
+type MessageActionEntity struct {
+	ID     string `json:"id"`
+	Domain string `json:"domain"`
+	Name   string `json:"name"`
+}
+
+type MessageAction struct {
+	Type             string                   `json:"type"`
+	Actions          []slack.AttachmentAction `json:"actions"`
+	CallbackID       string                   `json:"callback_id"`
+	Team             MessageActionEntity      `json:"team"`
+	Channel          MessageActionEntity      `json:"channel"`
+	User             MessageActionEntity      `json:"user"`
+	ActionTimestamp  json.Number              `json:"action_ts"`
+	MessageTimestamp json.Number              `json:"message_ts"`
+	AttachmentID     json.Number              `json:"attachment_id"`
+	Token            string                   `json:"token"`
+	Message          slack.Message            `json:"message"`
+	OriginalMessage  slack.Message            `json:"original_message"`
+	ResponseURL      string                   `json:"response_url"`
+	TriggerID        string                   `json:"trigger_id"`
+}

vendor/github.com/slack-go/slack/slackevents/inner_events.go

@@ -0,0 +1,790 @@
+// inner_events.go provides EventsAPI particular inner events
+
+package slackevents
+
+import (
+	"github.com/slack-go/slack"
+)
+
+// EventsAPIInnerEvent the inner event of a EventsAPI event_callback Event.
+type EventsAPIInnerEvent struct {
+	Type string `json:"type"`
+	Data interface{}
+}
+
+// AppMentionEvent is an (inner) EventsAPI subscribable event.
+type AppMentionEvent struct {
+	Type            string `json:"type"`
+	User            string `json:"user"`
+	Text            string `json:"text"`
+	TimeStamp       string `json:"ts"`
+	ThreadTimeStamp string `json:"thread_ts"`
+	Channel         string `json:"channel"`
+	EventTimeStamp  string `json:"event_ts"`
+
+	// When Message comes from a channel that is shared between workspaces
+	UserTeam   string `json:"user_team,omitempty"`
+	SourceTeam string `json:"source_team,omitempty"`
+
+	// BotID is filled out when a bot triggers the app_mention event
+	BotID string `json:"bot_id,omitempty"`
+
+	// When the app is mentioned in the edited message
+	Edited *Edited `json:"edited,omitempty"`
+}
+
+// AppHomeOpenedEvent Your Slack app home was opened.
+type AppHomeOpenedEvent struct {
+	Type           string     `json:"type"`
+	User           string     `json:"user"`
+	Channel        string     `json:"channel"`
+	EventTimeStamp string     `json:"event_ts"`
+	Tab            string     `json:"tab"`
+	View           slack.View `json:"view"`
+}
+
+// AppUninstalledEvent Your Slack app was uninstalled.
+type AppUninstalledEvent struct {
+	Type string `json:"type"`
+}
+
+// ChannelCreatedEvent represents the Channel created event
+type ChannelCreatedEvent struct {
+	Type           string             `json:"type"`
+	Channel        ChannelCreatedInfo `json:"channel"`
+	EventTimestamp string             `json:"event_ts"`
+}
+
+// ChannelDeletedEvent represents the Channel deleted event
+type ChannelDeletedEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ChannelArchiveEvent represents the Channel archive event
+type ChannelArchiveEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	User           string `json:"user"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ChannelUnarchiveEvent represents the Channel unarchive event
+type ChannelUnarchiveEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	User           string `json:"user"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ChannelLeftEvent represents the Channel left event
+type ChannelLeftEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ChannelRenameEvent represents the Channel rename event
+type ChannelRenameEvent struct {
+	Type           string            `json:"type"`
+	Channel        ChannelRenameInfo `json:"channel"`
+	EventTimestamp string            `json:"event_ts"`
+}
+
+// ChannelIDChangedEvent represents the Channel identifier changed event
+type ChannelIDChangedEvent struct {
+	Type           string `json:"type"`
+	OldChannelID   string `json:"old_channel_id"`
+	NewChannelID   string `json:"new_channel_id"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ChannelCreatedInfo represents the information associated with the Channel created event
+type ChannelCreatedInfo struct {
+	ID        string `json:"id"`
+	IsChannel bool   `json:"is_channel"`
+	Name      string `json:"name"`
+	Created   int    `json:"created"`
+	Creator   string `json:"creator"`
+}
+
+// ChannelRenameInfo represents the information associated with the Channel rename event
+type ChannelRenameInfo struct {
+	ID      string `json:"id"`
+	Name    string `json:"name"`
+	Created int    `json:"created"`
+}
+
+// GroupDeletedEvent represents the Group deleted event
+type GroupDeletedEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// GroupArchiveEvent represents the Group archive event
+type GroupArchiveEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// GroupUnarchiveEvent represents the Group unarchive event
+type GroupUnarchiveEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// GroupLeftEvent represents the Group left event
+type GroupLeftEvent struct {
+	Type           string `json:"type"`
+	Channel        string `json:"channel"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// GroupRenameEvent represents the Group rename event
+type GroupRenameEvent struct {
+	Type           string          `json:"type"`
+	Channel        GroupRenameInfo `json:"channel"`
+	EventTimestamp string          `json:"event_ts"`
+}
+
+// GroupRenameInfo represents the information associated with the Group rename event
+type GroupRenameInfo struct {
+	ID      string `json:"id"`
+	Name    string `json:"name"`
+	Created int    `json:"created"`
+}
+
+// FileChangeEvent represents the information associated with the File change
+// event.
+type FileChangeEvent struct {
+	Type   string        `json:"type"`
+	FileID string        `json:"file_id"`
+	File   FileEventFile `json:"file"`
+}
+
+// FileDeletedEvent represents the information associated with the File deleted
+// event.
+type FileDeletedEvent struct {
+	Type           string `json:"type"`
+	FileID         string `json:"file_id"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// FileSharedEvent represents the information associated with the File shared
+// event.
+type FileSharedEvent struct {
+	Type           string        `json:"type"`
+	ChannelID      string        `json:"channel_id"`
+	FileID         string        `json:"file_id"`
+	UserID         string        `json:"user_id"`
+	File           FileEventFile `json:"file"`
+	EventTimestamp string        `json:"event_ts"`
+}
+
+// FileUnsharedEvent represents the information associated with the File
+// unshared event.
+type FileUnsharedEvent struct {
+	Type   string        `json:"type"`
+	FileID string        `json:"file_id"`
+	File   FileEventFile `json:"file"`
+}
+
+// FileEventFile represents information on the specific file being shared in a
+// file-related Slack event.
+type FileEventFile struct {
+	ID string `json:"id"`
+}
+
+// GridMigrationFinishedEvent An enterprise grid migration has finished on this workspace.
+type GridMigrationFinishedEvent struct {
+	Type         string `json:"type"`
+	EnterpriseID string `json:"enterprise_id"`
+}
+
+// GridMigrationStartedEvent An enterprise grid migration has started on this workspace.
+type GridMigrationStartedEvent struct {
+	Type         string `json:"type"`
+	EnterpriseID string `json:"enterprise_id"`
+}
+
+// LinkSharedEvent A message was posted containing one or more links relevant to your application
+type LinkSharedEvent struct {
+	Type      string `json:"type"`
+	User      string `json:"user"`
+	TimeStamp string `json:"ts"`
+	Channel   string `json:"channel"`
+	// MessageTimeStamp can be both a numeric timestamp if the LinkSharedEvent corresponds to a sent
+	// message and (contrary to the field name) a uuid if the LinkSharedEvent is generated in the
+	// compose text area.
+	MessageTimeStamp string        `json:"message_ts"`
+	ThreadTimeStamp  string        `json:"thread_ts"`
+	Links            []SharedLinks `json:"links"`
+	EventTimestamp   string        `json:"event_ts"`
+}
+
+type SharedLinks struct {
+	Domain string `json:"domain"`
+	URL    string `json:"url"`
+}
+
+// MessageEvent occurs when a variety of types of messages has been posted.
+// Parse ChannelType to see which
+// if ChannelType = "group", this is a private channel message
+// if ChannelType = "channel", this message was sent to a channel
+// if ChannelType = "im", this is a private message
+// if ChannelType = "mim", A message was posted in a multiparty direct message channel
+// TODO: Improve this so that it is not required to manually parse ChannelType
+type MessageEvent struct {
+	// Basic Message Event - https://api.slack.com/events/message
+	ClientMsgID     string `json:"client_msg_id"`
+	Type            string `json:"type"`
+	User            string `json:"user"`
+	Text            string `json:"text"`
+	ThreadTimeStamp string `json:"thread_ts"`
+	TimeStamp       string `json:"ts"`
+	Channel         string `json:"channel"`
+	ChannelType     string `json:"channel_type"`
+	EventTimeStamp  string `json:"event_ts"`
+
+	// When Message comes from a channel that is shared between workspaces
+	UserTeam   string `json:"user_team,omitempty"`
+	SourceTeam string `json:"source_team,omitempty"`
+
+	// Edited Message
+	Message         *MessageEvent `json:"message,omitempty"`
+	PreviousMessage *MessageEvent `json:"previous_message,omitempty"`
+	Edited          *Edited       `json:"edited,omitempty"`
+
+	// Deleted Message
+	DeletedTimeStamp string `json:"deleted_ts,omitempty"`
+
+	// Message Subtypes
+	SubType string `json:"subtype,omitempty"`
+
+	// bot_message (https://api.slack.com/events/message/bot_message)
+	BotID    string `json:"bot_id,omitempty"`
+	Username string `json:"username,omitempty"`
+	Icons    *Icon  `json:"icons,omitempty"`
+
+	Upload bool   `json:"upload"`
+	Files  []File `json:"files"`
+
+	Blocks      slack.Blocks       `json:"blocks,omitempty"`
+	Attachments []slack.Attachment `json:"attachments,omitempty"`
+
+	// Root is the message that was broadcast to the channel when the SubType is
+	// thread_broadcast. If this is not a thread_broadcast message event, this
+	// value is nil.
+	Root *MessageEvent `json:"root"`
+}
+
+// MemberJoinedChannelEvent A member joined a public or private channel
+type MemberJoinedChannelEvent struct {
+	Type           string `json:"type"`
+	User           string `json:"user"`
+	Channel        string `json:"channel"`
+	ChannelType    string `json:"channel_type"`
+	Team           string `json:"team"`
+	Inviter        string `json:"inviter"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// MemberLeftChannelEvent A member left a public or private channel
+type MemberLeftChannelEvent struct {
+	Type           string `json:"type"`
+	User           string `json:"user"`
+	Channel        string `json:"channel"`
+	ChannelType    string `json:"channel_type"`
+	Team           string `json:"team"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+type pinEvent struct {
+	Type           string `json:"type"`
+	User           string `json:"user"`
+	Item           Item   `json:"item"`
+	Channel        string `json:"channel_id"`
+	EventTimestamp string `json:"event_ts"`
+	HasPins        bool   `json:"has_pins,omitempty"`
+}
+
+type reactionEvent struct {
+	Type           string `json:"type"`
+	User           string `json:"user"`
+	Reaction       string `json:"reaction"`
+	ItemUser       string `json:"item_user"`
+	Item           Item   `json:"item"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// ReactionAddedEvent An reaction was added to a message - https://api.slack.com/events/reaction_added
+type ReactionAddedEvent reactionEvent
+
+// ReactionRemovedEvent An reaction was removed from a message - https://api.slack.com/events/reaction_removed
+type ReactionRemovedEvent reactionEvent
+
+// PinAddedEvent An item was pinned to a channel - https://api.slack.com/events/pin_added
+type PinAddedEvent pinEvent
+
+// PinRemovedEvent An item was unpinned from a channel - https://api.slack.com/events/pin_removed
+type PinRemovedEvent pinEvent
+
+type tokens struct {
+	Oauth []string `json:"oauth"`
+	Bot   []string `json:"bot"`
+}
+
+// TeamJoinEvent A new member joined a workspace -  https://api.slack.com/events/team_join
+type TeamJoinEvent struct {
+	Type           string      `json:"type"`
+	User           *slack.User `json:"user"`
+	EventTimestamp string      `json:"event_ts"`
+}
+
+// TokensRevokedEvent APP's API tokens are revoked - https://api.slack.com/events/tokens_revoked
+type TokensRevokedEvent struct {
+	Type           string `json:"type"`
+	Tokens         tokens `json:"tokens"`
+	EventTimestamp string `json:"event_ts"`
+}
+
+// EmojiChangedEvent is the event of custom emoji has been added or changed
+type EmojiChangedEvent struct {
+	Type           string `json:"type"`
+	Subtype        string `json:"subtype"`
+	EventTimeStamp string `json:"event_ts"`
+
+	// filled out when custom emoji added
+	Name string `json:"name,omitempty"`
+
+	// filled out when custom emoji removed
+	Names []string `json:"names,omitempty"`
+
+	// filled out when custom emoji renamed
+	OldName string `json:"old_name,omitempty"`
+	NewName string `json:"new_name,omitempty"`
+
+	// filled out when custom emoji added or renamed
+	Value string `json:"value,omitempty"`
+}
+
+// WorkflowStepExecuteEvent is fired, if a workflow step of your app is invoked
+type WorkflowStepExecuteEvent struct {
+	Type           string            `json:"type"`
+	CallbackID     string            `json:"callback_id"`
+	WorkflowStep   EventWorkflowStep `json:"workflow_step"`
+	EventTimestamp string            `json:"event_ts"`
+}
+
+// MessageMetadataPostedEvent is sent, if a message with metadata is posted
+type MessageMetadataPostedEvent struct {
+	Type             string               `json:"type"`
+	AppId            string               `json:"app_id"`
+	BotId            string               `json:"bot_id"`
+	UserId           string               `json:"user_id"`
+	TeamId           string               `json:"team_id"`
+	ChannelId        string               `json:"channel_id"`
+	Metadata         *slack.SlackMetadata `json:"metadata"`
+	MessageTimestamp string               `json:"message_ts"`
+	EventTimestamp   string               `json:"event_ts"`
+}
+
+// MessageMetadataUpdatedEvent is sent, if a message with metadata is deleted
+type MessageMetadataUpdatedEvent struct {
+	Type             string               `json:"type"`
+	ChannelId        string               `json:"channel_id"`
+	EventTimestamp   string               `json:"event_ts"`
+	PreviousMetadata *slack.SlackMetadata `json:"previous_metadata"`
+	AppId            string               `json:"app_id"`
+	BotId            string               `json:"bot_id"`
+	UserId           string               `json:"user_id"`
+	TeamId           string               `json:"team_id"`
+	MessageTimestamp string               `json:"message_ts"`
+	Metadata         *slack.SlackMetadata `json:"metadata"`
+}
+
+// MessageMetadataDeletedEvent is sent, if a message with metadata is deleted
+type MessageMetadataDeletedEvent struct {
+	Type             string               `json:"type"`
+	ChannelId        string               `json:"channel_id"`
+	EventTimestamp   string               `json:"event_ts"`
+	PreviousMetadata *slack.SlackMetadata `json:"previous_metadata"`
+	AppId            string               `json:"app_id"`
+	BotId            string               `json:"bot_id"`
+	UserId           string               `json:"user_id"`
+	TeamId           string               `json:"team_id"`
+	MessageTimestamp string               `json:"message_ts"`
+	DeletedTimestamp string               `json:"deleted_ts"`
+}
+
+type EventWorkflowStep struct {
+	WorkflowStepExecuteID string                      `json:"workflow_step_execute_id"`
+	WorkflowID            string                      `json:"workflow_id"`
+	WorkflowInstanceID    string                      `json:"workflow_instance_id"`
+	StepID                string                      `json:"step_id"`
+	Inputs                *slack.WorkflowStepInputs   `json:"inputs,omitempty"`
+	Outputs               *[]slack.WorkflowStepOutput `json:"outputs,omitempty"`
+}
+
+// JSONTime exists so that we can have a String method converting the date
+type JSONTime int64
+
+// Comment contains all the information relative to a comment
+type Comment struct {
+	ID        string   `json:"id,omitempty"`
+	Created   JSONTime `json:"created,omitempty"`
+	Timestamp JSONTime `json:"timestamp,omitempty"`
+	User      string   `json:"user,omitempty"`
+	Comment   string   `json:"comment,omitempty"`
+}
+
+// File is a file upload
+type File struct {
+	ID                 string `json:"id"`
+	Created            int    `json:"created"`
+	Timestamp          int    `json:"timestamp"`
+	Name               string `json:"name"`
+	Title              string `json:"title"`
+	Mimetype           string `json:"mimetype"`
+	Filetype           string `json:"filetype"`
+	PrettyType         string `json:"pretty_type"`
+	User               string `json:"user"`
+	Editable           bool   `json:"editable"`
+	Size               int    `json:"size"`
+	Mode               string `json:"mode"`
+	IsExternal         bool   `json:"is_external"`
+	ExternalType       string `json:"external_type"`
+	IsPublic           bool   `json:"is_public"`
+	PublicURLShared    bool   `json:"public_url_shared"`
+	DisplayAsBot       bool   `json:"display_as_bot"`
+	Username           string `json:"username"`
+	URLPrivate         string `json:"url_private"`
+	URLPrivateDownload string `json:"url_private_download"`
+	Thumb64            string `json:"thumb_64"`
+	Thumb80            string `json:"thumb_80"`
+	Thumb360           string `json:"thumb_360"`
+	Thumb360W          int    `json:"thumb_360_w"`
+	Thumb360H          int    `json:"thumb_360_h"`
+	Thumb480           string `json:"thumb_480"`
+	Thumb480W          int    `json:"thumb_480_w"`
+	Thumb480H          int    `json:"thumb_480_h"`
+	Thumb160           string `json:"thumb_160"`
+	Thumb720           string `json:"thumb_720"`
+	Thumb720W          int    `json:"thumb_720_w"`
+	Thumb720H          int    `json:"thumb_720_h"`
+	Thumb800           string `json:"thumb_800"`
+	Thumb800W          int    `json:"thumb_800_w"`
+	Thumb800H          int    `json:"thumb_800_h"`
+	Thumb960           string `json:"thumb_960"`
+	Thumb960W          int    `json:"thumb_960_w"`
+	Thumb960H          int    `json:"thumb_960_h"`
+	Thumb1024          string `json:"thumb_1024"`
+	Thumb1024W         int    `json:"thumb_1024_w"`
+	Thumb1024H         int    `json:"thumb_1024_h"`
+	ImageExifRotation  int    `json:"image_exif_rotation"`
+	OriginalW          int    `json:"original_w"`
+	OriginalH          int    `json:"original_h"`
+	Permalink          string `json:"permalink"`
+	PermalinkPublic    string `json:"permalink_public"`
+}
+
+// Edited is included when a Message is edited
+type Edited struct {
+	User      string `json:"user"`
+	TimeStamp string `json:"ts"`
+}
+
+// Icon is used for bot messages
+type Icon struct {
+	IconURL   string `json:"icon_url,omitempty"`
+	IconEmoji string `json:"icon_emoji,omitempty"`
+}
+
+// Item is any type of slack message - message, file, or file comment.
+type Item struct {
+	Type      string       `json:"type"`
+	Channel   string       `json:"channel,omitempty"`
+	Message   *ItemMessage `json:"message,omitempty"`
+	File      *File        `json:"file,omitempty"`
+	Comment   *Comment     `json:"comment,omitempty"`
+	Timestamp string       `json:"ts,omitempty"`
+}
+
+// ItemMessage is the event message
+type ItemMessage struct {
+	Type            string   `json:"type"`
+	User            string   `json:"user"`
+	Text            string   `json:"text"`
+	Timestamp       string   `json:"ts"`
+	PinnedTo        []string `json:"pinned_to"`
+	ReplaceOriginal bool     `json:"replace_original"`
+	DeleteOriginal  bool     `json:"delete_original"`
+}
+
+// IsEdited checks if the MessageEvent is caused by an edit
+func (e MessageEvent) IsEdited() bool {
+	return e.Message != nil &&
+		e.Message.Edited != nil
+}
+
+// TeamAccessGrantedEvent is sent if access to teams was granted for your org-wide app.
+type TeamAccessGrantedEvent struct {
+	Type    string   `json:"type"`
+	TeamIDs []string `json:"team_ids"`
+}
+
+// TeamAccessRevokedEvent is sent if access to teams was revoked for your org-wide app.
+type TeamAccessRevokedEvent struct {
+	Type    string   `json:"type"`
+	TeamIDs []string `json:"team_ids"`
+}
+
+// UserProfileChangedEvent is sent if access to teams was revoked for your org-wide app.
+type UserProfileChangedEvent struct {
+	User    *slack.User `json:"user"`
+	CacheTs int         `json:"cache_ts"`
+	Type    string      `json:"type"`
+	EventTs string      `json:"event_ts"`
+}
+
+// SharedChannelInviteApprovedEvent is sent if your invitation has been approved
+type SharedChannelInviteApprovedEvent struct {
+	Type            string              `json:"type"`
+	Invite          *SharedInvite       `json:"invite"`
+	Channel         *slack.Conversation `json:"channel"`
+	ApprovingTeamID string              `json:"approving_team_id"`
+	TeamsInChannel  []*SlackEventTeam   `json:"teams_in_channel"`
+	ApprovingUser   *SlackEventUser     `json:"approving_user"`
+	EventTs         string              `json:"event_ts"`
+}
+
+// SharedChannelInviteAcceptedEvent is sent if external org accepts a Slack Connect channel invite
+type SharedChannelInviteAcceptedEvent struct {
+	Type                string            `json:"type"`
+	ApprovalRequired    bool              `json:"approval_required"`
+	Invite              *SharedInvite     `json:"invite"`
+	Channel             *SharedChannel    `json:"channel"`
+	TeamsInChannel      []*SlackEventTeam `json:"teams_in_channel"`
+	AcceptingUser       *SlackEventUser   `json:"accepting_user"`
+	EventTs             string            `json:"event_ts"`
+	RequiresSponsorship bool              `json:"requires_sponsorship,omitempty"`
+}
+
+// SharedChannelInviteDeclinedEvent is sent if external or internal org declines the Slack Connect invite
+type SharedChannelInviteDeclinedEvent struct {
+	Type            string            `json:"type"`
+	Invite          *SharedInvite     `json:"invite"`
+	Channel         *SharedChannel    `json:"channel"`
+	DecliningTeamID string            `json:"declining_team_id"`
+	TeamsInChannel  []*SlackEventTeam `json:"teams_in_channel"`
+	DecliningUser   *SlackEventUser   `json:"declining_user"`
+	EventTs         string            `json:"event_ts"`
+}
+
+// SharedChannelInviteReceivedEvent is sent if a bot or app is invited to a Slack Connect channel
+type SharedChannelInviteReceivedEvent struct {
+	Type    string         `json:"type"`
+	Invite  *SharedInvite  `json:"invite"`
+	Channel *SharedChannel `json:"channel"`
+	EventTs string         `json:"event_ts"`
+}
+
+// SlackEventTeam is a struct for teams in ShareChannel events
+type SlackEventTeam struct {
+	ID                  string          `json:"id"`
+	Name                string          `json:"name"`
+	Icon                *SlackEventIcon `json:"icon,omitempty"`
+	AvatarBaseURL       string          `json:"avatar_base_url,omitempty"`
+	IsVerified          bool            `json:"is_verified"`
+	Domain              string          `json:"domain"`
+	DateCreated         int             `json:"date_created"`
+	RequiresSponsorship bool            `json:"requires_sponsorship,omitempty"`
+	// TeamID              string          `json:"team_id,omitempty"`
+}
+
+// SlackEventIcon is a struct for icons in ShareChannel events
+type SlackEventIcon struct {
+	ImageDefault bool   `json:"image_default,omitempty"`
+	Image34      string `json:"image_34,omitempty"`
+	Image44      string `json:"image_44,omitempty"`
+	Image68      string `json:"image_68,omitempty"`
+	Image88      string `json:"image_88,omitempty"`
+	Image102     string `json:"image_102,omitempty"`
+	Image132     string `json:"image_132,omitempty"`
+	Image230     string `json:"image_230,omitempty"`
+}
+
+// SlackEventUser is a struct for users in ShareChannel events
+type SlackEventUser struct {
+	ID                     string             `json:"id"`
+	TeamID                 string             `json:"team_id"`
+	Name                   string             `json:"name"`
+	Updated                int                `json:"updated,omitempty"`
+	Profile                *slack.UserProfile `json:"profile,omitempty"`
+	WhoCanShareContactCard string             `json:"who_can_share_contact_card,omitempty"`
+}
+
+// SharedChannel is a struct for shared channels in ShareChannel events
+type SharedChannel struct {
+	ID        string `json:"id"`
+	IsPrivate bool   `json:"is_private"`
+	IsIm      bool   `json:"is_im"`
+	Name      string `json:"name,omitempty"`
+}
+
+// SharedInvite is a struct for shared invites in ShareChannel events
+type SharedInvite struct {
+	ID                string          `json:"id"`
+	DateCreated       int             `json:"date_created"`
+	DateInvalid       int             `json:"date_invalid"`
+	InvitingTeam      *SlackEventTeam `json:"inviting_team,omitempty"`
+	InvitingUser      *SlackEventUser `json:"inviting_user,omitempty"`
+	RecipientEmail    string          `json:"recipient_email,omitempty"`
+	RecipientUserID   string          `json:"recipient_user_id,omitempty"`
+	IsSponsored       bool            `json:"is_sponsored,omitempty"`
+	IsExternalLimited bool            `json:"is_external_limited,omitempty"`
+}
+
+type EventsAPIType string
+
+const (
+	// AppMention is an Events API subscribable event
+	AppMention = EventsAPIType("app_mention")
+	// AppHomeOpened Your Slack app home was opened
+	AppHomeOpened = EventsAPIType("app_home_opened")
+	// AppUninstalled Your Slack app was uninstalled.
+	AppUninstalled = EventsAPIType("app_uninstalled")
+	// ChannelCreated is sent when a new channel is created.
+	ChannelCreated = EventsAPIType("channel_created")
+	// ChannelDeleted is sent when a channel is deleted.
+	ChannelDeleted = EventsAPIType("channel_deleted")
+	// ChannelArchive is sent when a channel is archived.
+	ChannelArchive = EventsAPIType("channel_archive")
+	// ChannelUnarchive is sent when a channel is unarchived.
+	ChannelUnarchive = EventsAPIType("channel_unarchive")
+	// ChannelLeft is sent when a channel is left.
+	ChannelLeft = EventsAPIType("channel_left")
+	// ChannelRename is sent when a channel is rename.
+	ChannelRename = EventsAPIType("channel_rename")
+	// ChannelIDChanged is sent when a channel identifier is changed.
+	ChannelIDChanged = EventsAPIType("channel_id_changed")
+	// GroupDeleted is sent when a group is deleted.
+	GroupDeleted = EventsAPIType("group_deleted")
+	// GroupArchive is sent when a group is archived.
+	GroupArchive = EventsAPIType("group_archive")
+	// GroupUnarchive is sent when a group is unarchived.
+	GroupUnarchive = EventsAPIType("group_unarchive")
+	// GroupLeft is sent when a group is left.
+	GroupLeft = EventsAPIType("group_left")
+	// GroupRename is sent when a group is renamed.
+	GroupRename = EventsAPIType("group_rename")
+	// FileChange is sent when a file is changed.
+	FileChange = EventsAPIType("file_change")
+	// FileDeleted is sent when a file is deleted.
+	FileDeleted = EventsAPIType("file_deleted")
+	// FileShared is sent when a file is shared.
+	FileShared = EventsAPIType("file_shared")
+	// FileUnshared is sent when a file is unshared.
+	FileUnshared = EventsAPIType("file_unshared")
+	// GridMigrationFinished An enterprise grid migration has finished on this workspace.
+	GridMigrationFinished = EventsAPIType("grid_migration_finished")
+	// GridMigrationStarted An enterprise grid migration has started on this workspace.
+	GridMigrationStarted = EventsAPIType("grid_migration_started")
+	// LinkShared A message was posted containing one or more links relevant to your application
+	LinkShared = EventsAPIType("link_shared")
+	// Message A message was posted to a channel, private channel (group), im, or mim
+	Message = EventsAPIType("message")
+	// MemberJoinedChannel is sent if a member joined a channel.
+	MemberJoinedChannel = EventsAPIType("member_joined_channel")
+	// MemberLeftChannel is sent if a member left a channel.
+	MemberLeftChannel = EventsAPIType("member_left_channel")
+	// PinAdded An item was pinned to a channel
+	PinAdded = EventsAPIType("pin_added")
+	// PinRemoved An item was unpinned from a channel
+	PinRemoved = EventsAPIType("pin_removed")
+	// ReactionAdded An reaction was added to a message
+	ReactionAdded = EventsAPIType("reaction_added")
+	// ReactionRemoved An reaction was removed from a message
+	ReactionRemoved = EventsAPIType("reaction_removed")
+	// TeamJoin A new user joined the workspace
+	TeamJoin = EventsAPIType("team_join")
+	// Slack connect app or bot invite received
+	SharedChannelInviteReceived = EventsAPIType("shared_channel_invite_received")
+	// Slack connect channel invite approved
+	SharedChannelInviteApproved = EventsAPIType("shared_channel_invite_approved")
+	// Slack connect channel invite declined
+	SharedChannelInviteDeclined = EventsAPIType("shared_channel_invite_declined")
+	// Slack connect channel invite accepted by an end user
+	SharedChannelInviteAccepted = EventsAPIType("shared_channel_invite_accepted")
+	// TokensRevoked APP's API tokes are revoked
+	TokensRevoked = EventsAPIType("tokens_revoked")
+	// EmojiChanged A custom emoji has been added or changed
+	EmojiChanged = EventsAPIType("emoji_changed")
+	// WorkflowStepExecute Happens, if a workflow step of your app is invoked
+	WorkflowStepExecute = EventsAPIType("workflow_step_execute")
+	// MessageMetadataPosted A message with metadata was posted
+	MessageMetadataPosted = EventsAPIType("message_metadata_posted")
+	// MessageMetadataUpdated A message with metadata was updated
+	MessageMetadataUpdated = EventsAPIType("message_metadata_updated")
+	// MessageMetadataDeleted A message with metadata was deleted
+	MessageMetadataDeleted = EventsAPIType("message_metadata_deleted")
+	// TeamAccessGranted is sent if access to teams was granted for your org-wide app.
+	TeamAccessGranted = EventsAPIType("team_access_granted")
+	// TeamAccessRevoked is sent if access to teams was revoked for your org-wide app.
+	TeamAccessRevoked = EventsAPIType("team_access_revoked")
+	// UserProfileChanged is sent if a user's profile information has changed.
+	UserProfileChanged = EventsAPIType("user_profile_changed")
+)
+
+// EventsAPIInnerEventMapping maps INNER Event API events to their corresponding struct
+// implementations. The structs should be instances of the unmarshalling
+// target for the matching event type.
+var EventsAPIInnerEventMapping = map[EventsAPIType]interface{}{
+	AppMention:                  AppMentionEvent{},
+	AppHomeOpened:               AppHomeOpenedEvent{},
+	AppUninstalled:              AppUninstalledEvent{},
+	ChannelCreated:              ChannelCreatedEvent{},
+	ChannelDeleted:              ChannelDeletedEvent{},
+	ChannelArchive:              ChannelArchiveEvent{},
+	ChannelUnarchive:            ChannelUnarchiveEvent{},
+	ChannelLeft:                 ChannelLeftEvent{},
+	ChannelRename:               ChannelRenameEvent{},
+	ChannelIDChanged:            ChannelIDChangedEvent{},
+	FileChange:                  FileChangeEvent{},
+	FileDeleted:                 FileDeletedEvent{},
+	FileShared:                  FileSharedEvent{},
+	FileUnshared:                FileUnsharedEvent{},
+	GroupDeleted:                GroupDeletedEvent{},
+	GroupArchive:                GroupArchiveEvent{},
+	GroupUnarchive:              GroupUnarchiveEvent{},
+	GroupLeft:                   GroupLeftEvent{},
+	GroupRename:                 GroupRenameEvent{},
+	GridMigrationFinished:       GridMigrationFinishedEvent{},
+	GridMigrationStarted:        GridMigrationStartedEvent{},
+	LinkShared:                  LinkSharedEvent{},
+	Message:                     MessageEvent{},
+	MemberJoinedChannel:         MemberJoinedChannelEvent{},
+	MemberLeftChannel:           MemberLeftChannelEvent{},
+	PinAdded:                    PinAddedEvent{},
+	PinRemoved:                  PinRemovedEvent{},
+	ReactionAdded:               ReactionAddedEvent{},
+	ReactionRemoved:             ReactionRemovedEvent{},
+	SharedChannelInviteApproved: SharedChannelInviteApprovedEvent{},
+	SharedChannelInviteAccepted: SharedChannelInviteAcceptedEvent{},
+	SharedChannelInviteDeclined: SharedChannelInviteDeclinedEvent{},
+	SharedChannelInviteReceived: SharedChannelInviteReceivedEvent{},
+	TeamJoin:                    TeamJoinEvent{},
+	TokensRevoked:               TokensRevokedEvent{},
+	EmojiChanged:                EmojiChangedEvent{},
+	WorkflowStepExecute:         WorkflowStepExecuteEvent{},
+	MessageMetadataPosted:       MessageMetadataPostedEvent{},
+	MessageMetadataUpdated:      MessageMetadataUpdatedEvent{},
+	MessageMetadataDeleted:      MessageMetadataDeletedEvent{},
+	TeamAccessGranted:           TeamAccessGrantedEvent{},
+	TeamAccessRevoked:           TeamAccessRevokedEvent{},
+	UserProfileChanged:          UserProfileChangedEvent{},
+}

vendor/github.com/slack-go/slack/slackevents/outer_events.go

@@ -0,0 +1,72 @@
+// outer_events.go provides EventsAPI particular outer events
+
+package slackevents
+
+import (
+	"encoding/json"
+)
+
+// EventsAPIEvent is the base EventsAPIEvent
+type EventsAPIEvent struct {
+	Token        string `json:"token"`
+	TeamID       string `json:"team_id"`
+	Type         string `json:"type"`
+	APIAppID     string `json:"api_app_id"`
+	EnterpriseID string `json:"enterprise_id"`
+	Data         interface{}
+	InnerEvent   EventsAPIInnerEvent
+}
+
+// EventsAPIURLVerificationEvent received when configuring a EventsAPI driven app
+type EventsAPIURLVerificationEvent struct {
+	Token     string `json:"token"`
+	Challenge string `json:"challenge"`
+	Type      string `json:"type"`
+}
+
+// ChallengeResponse is a response to a EventsAPIEvent URLVerification challenge
+type ChallengeResponse struct {
+	Challenge string
+}
+
+// EventsAPICallbackEvent is the main (outer) EventsAPI event.
+type EventsAPICallbackEvent struct {
+	Type         string           `json:"type"`
+	Token        string           `json:"token"`
+	TeamID       string           `json:"team_id"`
+	APIAppID     string           `json:"api_app_id"`
+	EnterpriseID string           `json:"enterprise_id"`
+	InnerEvent   *json.RawMessage `json:"event"`
+	AuthedUsers  []string         `json:"authed_users"`
+	AuthedTeams  []string         `json:"authed_teams"`
+	EventID      string           `json:"event_id"`
+	EventTime    int              `json:"event_time"`
+	EventContext string           `json:"event_context"`
+}
+
+// EventsAPIAppRateLimited indicates your app's event subscriptions are being rate limited
+type EventsAPIAppRateLimited struct {
+	Type              string `json:"type"`
+	Token             string `json:"token"`
+	TeamID            string `json:"team_id"`
+	MinuteRateLimited int    `json:"minute_rate_limited"`
+	APIAppID          string `json:"api_app_id"`
+}
+
+const (
+	// CallbackEvent is the "outer" event of an EventsAPI event.
+	CallbackEvent = "event_callback"
+	// URLVerification is an event used when configuring your EventsAPI app
+	URLVerification = "url_verification"
+	// AppRateLimited indicates your app's event subscriptions are being rate limited
+	AppRateLimited = "app_rate_limited"
+)
+
+// EventsAPIEventMap maps OUTER Event API events to their corresponding struct
+// implementations. The structs should be instances of the unmarshalling
+// target for the matching event type.
+var EventsAPIEventMap = map[string]interface{}{
+	CallbackEvent:   EventsAPICallbackEvent{},
+	URLVerification: EventsAPIURLVerificationEvent{},
+	AppRateLimited:  EventsAPIAppRateLimited{},
+}

vendor/github.com/slack-go/slack/slackevents/parsers.go

@@ -0,0 +1,258 @@
+package slackevents
+
+import (
+	"crypto/subtle"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/slack-go/slack"
+)
+
+// eventsMap checks both slack.EventsMapping and
+// and slackevents.EventsAPIInnerEventMapping. If the event
+// exists, returns the unmarshalled struct instance of
+// target for the matching event type.
+// TODO: Consider moving all events into its own package?
+func eventsMap(t string) (interface{}, bool) {
+	// Must parse EventsAPI FIRST as both RTM and EventsAPI
+	// have a type: "Message" event.
+	// TODO: Handle these cases more explicitly.
+	v, exists := EventsAPIInnerEventMapping[EventsAPIType(t)]
+	if exists {
+		return v, exists
+	}
+	v, exists = slack.EventMapping[t]
+	if exists {
+		return v, exists
+	}
+	return v, exists
+}
+
+func parseOuterEvent(rawE json.RawMessage) (EventsAPIEvent, error) {
+	e := &EventsAPIEvent{}
+	err := json.Unmarshal(rawE, e)
+	if err != nil {
+		return EventsAPIEvent{
+			"",
+			"",
+			"unmarshalling_error",
+			"",
+			"",
+			&slack.UnmarshallingErrorEvent{ErrorObj: err},
+			EventsAPIInnerEvent{},
+		}, err
+	}
+	if e.Type == CallbackEvent {
+		cbEvent := &EventsAPICallbackEvent{}
+		err = json.Unmarshal(rawE, cbEvent)
+		if err != nil {
+			return EventsAPIEvent{
+				"",
+				"",
+				"unmarshalling_error",
+				"",
+				"",
+				&slack.UnmarshallingErrorEvent{ErrorObj: err},
+				EventsAPIInnerEvent{},
+			}, err
+		}
+		return EventsAPIEvent{
+			e.Token,
+			e.TeamID,
+			e.Type,
+			e.APIAppID,
+			e.EnterpriseID,
+			cbEvent,
+			EventsAPIInnerEvent{},
+		}, nil
+	}
+	urlVE := &EventsAPIURLVerificationEvent{}
+	err = json.Unmarshal(rawE, urlVE)
+	if err != nil {
+		return EventsAPIEvent{
+			"",
+			"",
+			"unmarshalling_error",
+			"",
+			"",
+			&slack.UnmarshallingErrorEvent{ErrorObj: err},
+			EventsAPIInnerEvent{},
+		}, err
+	}
+	return EventsAPIEvent{
+		e.Token,
+		e.TeamID,
+		e.Type,
+		e.APIAppID,
+		e.EnterpriseID,
+		urlVE,
+		EventsAPIInnerEvent{},
+	}, nil
+}
+
+func parseInnerEvent(e *EventsAPICallbackEvent) (EventsAPIEvent, error) {
+	iE := &slack.Event{}
+	rawInnerJSON := e.InnerEvent
+	err := json.Unmarshal(*rawInnerJSON, iE)
+	if err != nil {
+		return EventsAPIEvent{
+			e.Token,
+			e.TeamID,
+			"unmarshalling_error",
+			e.APIAppID,
+			e.EnterpriseID,
+			&slack.UnmarshallingErrorEvent{ErrorObj: err},
+			EventsAPIInnerEvent{},
+		}, err
+	}
+	v, exists := eventsMap(iE.Type)
+	if !exists {
+		return EventsAPIEvent{
+			e.Token,
+			e.TeamID,
+			iE.Type,
+			e.APIAppID,
+			e.EnterpriseID,
+			nil,
+			EventsAPIInnerEvent{},
+		}, fmt.Errorf("inner Event does not exist! %s", iE.Type)
+	}
+	t := reflect.TypeOf(v)
+	recvEvent := reflect.New(t).Interface()
+	err = json.Unmarshal(*rawInnerJSON, recvEvent)
+	if err != nil {
+		return EventsAPIEvent{
+			e.Token,
+			e.TeamID,
+			"unmarshalling_error",
+			e.APIAppID,
+			e.EnterpriseID,
+			&slack.UnmarshallingErrorEvent{ErrorObj: err},
+			EventsAPIInnerEvent{},
+		}, err
+	}
+	return EventsAPIEvent{
+		e.Token,
+		e.TeamID,
+		e.Type,
+		e.APIAppID,
+		e.EnterpriseID,
+		e,
+		EventsAPIInnerEvent{iE.Type, recvEvent},
+	}, nil
+}
+
+type Config struct {
+	VerificationToken string
+	TokenVerified     bool
+}
+
+type Option func(cfg *Config)
+
+type verifier interface {
+	Verify(token string) bool
+}
+
+func OptionVerifyToken(v verifier) Option {
+	return func(cfg *Config) {
+		cfg.TokenVerified = v.Verify(cfg.VerificationToken)
+	}
+}
+
+// OptionNoVerifyToken skips the check of the Slack verification token
+func OptionNoVerifyToken() Option {
+	return func(cfg *Config) {
+		cfg.TokenVerified = true
+	}
+}
+
+type TokenComparator struct {
+	VerificationToken string
+}
+
+func (c TokenComparator) Verify(t string) bool {
+	return subtle.ConstantTimeCompare([]byte(c.VerificationToken), []byte(t)) == 1
+}
+
+// ParseEvent parses the outer and inner events (if applicable) of an events
+// api event returning a EventsAPIEvent type. If the event is a url_verification event,
+// the inner event is empty.
+func ParseEvent(rawEvent json.RawMessage, opts ...Option) (EventsAPIEvent, error) {
+	e, err := parseOuterEvent(rawEvent)
+	if err != nil {
+		return EventsAPIEvent{}, err
+	}
+
+	cfg := &Config{}
+	cfg.VerificationToken = e.Token
+	for _, opt := range opts {
+		opt(cfg)
+	}
+
+	if !cfg.TokenVerified {
+		return EventsAPIEvent{}, errors.New("invalid verification token")
+	}
+
+	if e.Type == CallbackEvent {
+		cbEvent := e.Data.(*EventsAPICallbackEvent)
+		innerEvent, err := parseInnerEvent(cbEvent)
+		if err != nil {
+			err := fmt.Errorf("EventsAPI Error parsing inner event: %s, %s", innerEvent.Type, err)
+			return EventsAPIEvent{
+				"",
+				"",
+				"unmarshalling_error",
+				"",
+				"",
+				&slack.UnmarshallingErrorEvent{ErrorObj: err},
+				EventsAPIInnerEvent{},
+			}, err
+		}
+		return innerEvent, nil
+	}
+	urlVerificationEvent := &EventsAPIURLVerificationEvent{}
+	err = json.Unmarshal(rawEvent, urlVerificationEvent)
+	if err != nil {
+		return EventsAPIEvent{
+			"",
+			"",
+			"unmarshalling_error",
+			"",
+			"",
+			&slack.UnmarshallingErrorEvent{ErrorObj: err},
+			EventsAPIInnerEvent{},
+		}, err
+	}
+	return EventsAPIEvent{
+		e.Token,
+		e.TeamID,
+		e.Type,
+		e.APIAppID,
+		e.EnterpriseID,
+		urlVerificationEvent,
+		EventsAPIInnerEvent{},
+	}, nil
+}
+
+func ParseActionEvent(payloadString string, opts ...Option) (MessageAction, error) {
+	byteString := []byte(payloadString)
+	action := MessageAction{}
+	err := json.Unmarshal(byteString, &action)
+	if err != nil {
+		return MessageAction{}, errors.New("MessageAction unmarshalling failed")
+	}
+
+	cfg := &Config{}
+	cfg.VerificationToken = action.Token
+	for _, opt := range opts {
+		opt(cfg)
+	}
+
+	if !cfg.TokenVerified {
+		return MessageAction{}, errors.New("invalid verification token")
+	} else {
+		return action, nil
+	}
+}

vendor/github.com/slack-go/slack/socketmode/client.go

@@ -0,0 +1,63 @@
+package socketmode
+
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/slack-go/slack"
+
+	"github.com/gorilla/websocket"
+)
+
+type ConnectedEvent struct {
+	ConnectionCount int // 1 = first time, 2 = second time
+	Info            *slack.SocketModeConnection
+}
+
+type DebugInfo struct {
+	// Host is the name of the host name on the Slack end, that can be something like `applink-7fc4fdbb64-4x5xq`
+	Host string `json:"host"`
+
+	// `hello` type only
+	BuildNumber               int `json:"build_number"`
+	ApproximateConnectionTime int `json:"approximate_connection_time"`
+}
+
+type ConnectionInfo struct {
+	AppID string `json:"app_id"`
+}
+
+type SocketModeMessagePayload struct {
+	Event json.RawMessage `json:"event"`
+}
+
+// Client is a Socket Mode client that allows programs to use [Events API](https://api.slack.com/events-api)
+// and [interactive components](https://api.slack.com/interactivity) over WebSocket.
+// Please see [Intro to Socket Mode](https://api.slack.com/apis/connections/socket) for more information
+// on Socket Mode.
+//
+// The implementation is highly inspired by https://www.npmjs.com/package/@slack/socket-mode,
+// but the structure and the design has been adapted as much as possible to that of our RTM client for consistency
+// within the library.
+//
+// You can instantiate the socket mode client with
+// Client's New() and call Run() to start it. Please see examples/socketmode for the usage.
+type Client struct {
+	// Client is the main API, embedded
+	slack.Client
+
+	// maxPingInterval is the maximum duration elapsed after the last WebSocket PING sent from Slack
+	// until Client considers the WebSocket connection is dead and needs to be reopened.
+	maxPingInterval time.Duration
+
+	// Connection life-cycle
+	Events              chan Event
+	socketModeResponses chan *Response
+
+	// dialer is a gorilla/websocket Dialer. If nil, use the default
+	// Dialer.
+	dialer *websocket.Dialer
+
+	debug bool
+	log   ilogger
+}

vendor/github.com/slack-go/slack/socketmode/event.go

@@ -0,0 +1,30 @@
+package socketmode
+
+import "encoding/json"
+
+// Event is the event sent to the consumer of Client
+type Event struct {
+	Type EventType
+	Data interface{}
+
+	// Request is the json-decoded raw WebSocket message that is received via the Slack Socket Mode
+	// WebSocket connection.
+	Request *Request
+}
+
+type ErrorBadMessage struct {
+	Cause   error
+	Message json.RawMessage
+}
+
+type ErrorWriteFailed struct {
+	Cause    error
+	Response *Response
+}
+
+type errorRequestedDisconnect struct {
+}
+
+func (e errorRequestedDisconnect) Error() string {
+	return "disconnection requested: Slack requested us to disconnect"
+}

vendor/github.com/slack-go/slack/socketmode/log.go

@@ -0,0 +1,51 @@
+package socketmode
+
+import "fmt"
+
+// TODO merge logger, ilogger, and internalLogger with the top-level package's equivalents
+
+// logger is a logger interface compatible with both stdlib and some
+// 3rd party loggers.
+type logger interface {
+	Output(int, string) error
+}
+
+// ilogger represents the internal logging api we use.
+type ilogger interface {
+	logger
+	Print(...interface{})
+	Printf(string, ...interface{})
+	Println(...interface{})
+}
+
+// internalLog implements the additional methods used by our internal logging.
+type internalLog struct {
+	logger
+}
+
+// Println replicates the behaviour of the standard logger.
+func (t internalLog) Println(v ...interface{}) {
+	t.Output(2, fmt.Sprintln(v...))
+}
+
+// Printf replicates the behaviour of the standard logger.
+func (t internalLog) Printf(format string, v ...interface{}) {
+	t.Output(2, fmt.Sprintf(format, v...))
+}
+
+// Print replicates the behaviour of the standard logger.
+func (t internalLog) Print(v ...interface{}) {
+	t.Output(2, fmt.Sprint(v...))
+}
+
+func (smc *Client) Debugf(format string, v ...interface{}) {
+	if smc.debug {
+		smc.log.Output(2, fmt.Sprintf(format, v...))
+	}
+}
+
+func (smc *Client) Debugln(v ...interface{}) {
+	if smc.debug {
+		smc.log.Output(2, fmt.Sprintln(v...))
+	}
+}

vendor/github.com/slack-go/slack/socketmode/request.go

@@ -0,0 +1,38 @@
+package socketmode
+
+import "encoding/json"
+
+// Request maps to the content of each WebSocket message received via a Socket Mode WebSocket connection
+//
+// We call this a "request" rather than e.g. a WebSocket message or an Socket Mode "event" following python-slack-sdk:
+//
+// https://github.com/slackapi/python-slack-sdk/blob/3f1c4c6e27bf7ee8af57699b2543e6eb7848bcf9/slack_sdk/socket_mode/request.py#L6
+//
+// We know that node-slack-sdk calls it an "event", that makes it hard for us to distinguish our client's own event
+// that wraps both internal events and Socket Mode "events", vs node-slack-sdk's is for the latter only.
+//
+// https://github.com/slackapi/node-slack-sdk/blob/main/packages/socket-mode/src/SocketModeClient.ts#L537
+type Request struct {
+	Type string `json:"type"`
+
+	// `hello` type only
+	NumConnections int            `json:"num_connections"`
+	ConnectionInfo ConnectionInfo `json:"connection_info"`
+
+	// `disconnect` type only
+
+	// Reason can be "warning" or else
+	Reason string `json:"reason"`
+
+	// `hello` and `disconnect` types only
+	DebugInfo DebugInfo `json:"debug_info"`
+
+	// `events_api` type only
+	EnvelopeID string `json:"envelope_id"`
+	// TODO Can it really be a non-object type?
+	// See https://github.com/slackapi/python-slack-sdk/blob/3f1c4c6e27bf7ee8af57699b2543e6eb7848bcf9/slack_sdk/socket_mode/request.py#L26-L31
+	Payload                json.RawMessage `json:"payload"`
+	AcceptsResponsePayload bool            `json:"accepts_response_payload"`
+	RetryAttempt           int             `json:"retry_attempt"`
+	RetryReason            string          `json:"retry_reason"`
+}

vendor/github.com/slack-go/slack/socketmode/response.go

@@ -0,0 +1,6 @@
+package socketmode
+
+type Response struct {
+	EnvelopeID string      `json:"envelope_id"`
+	Payload    interface{} `json:"payload,omitempty"`
+}

vendor/github.com/slack-go/slack/socketmode/socket_mode_managed_conn.go

@@ -0,0 +1,633 @@
+package socketmode
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+
+	"github.com/slack-go/slack"
+	"github.com/slack-go/slack/internal/backoff"
+	"github.com/slack-go/slack/internal/timex"
+	"github.com/slack-go/slack/slackevents"
+)
+
+// Run is a blocking function that connects the Slack Socket Mode API and handles all incoming
+// requests and outgoing responses.
+//
+// The consumer of the Client and this function should read the Client.Events channel to receive
+// `socketmode.Event`s that includes the client-specific events that may or may not wrap Socket Mode requests.
+//
+// Note that this function automatically reconnect on requested by Slack through a `disconnect` message.
+// This function exists with an error only when a reconnection is failued due to some reason.
+// If you want to retry even on reconnection failure, you'd need to write your own wrapper for this function
+// to do so.
+func (smc *Client) Run() error {
+	return smc.RunContext(context.TODO())
+}
+
+// RunContext is a blocking function that connects the Slack Socket Mode API and handles all incoming
+// requests and outgoing responses.
+//
+// The consumer of the Client and this function should read the Client.Events channel to receive
+// `socketmode.Event`s that includes the client-specific events that may or may not wrap Socket Mode requests.
+//
+// Note that this function automatically reconnect on requested by Slack through a `disconnect` message.
+// This function exists with an error only when a reconnection is failued due to some reason.
+// If you want to retry even on reconnection failure, you'd need to write your own wrapper for this function
+// to do so.
+func (smc *Client) RunContext(ctx context.Context) error {
+	for connectionCount := 0; ; connectionCount++ {
+		if err := smc.run(ctx, connectionCount); err != nil {
+			return err
+		}
+
+		// Continue and run the loop again to reconnect
+	}
+}
+
+func (smc *Client) run(ctx context.Context, connectionCount int) error {
+	messages := make(chan json.RawMessage, 1)
+
+	pingChan := make(chan time.Time, 1)
+	pingHandler := func(_ string) error {
+		select {
+		case pingChan <- time.Now():
+		default:
+		}
+
+		return nil
+	}
+
+	// Start trying to connect
+	// the returned err is already passed onto the Events channel
+	//
+	// We also configures an additional ping handler for the deadmanTimer that triggers a timeout when
+	// Slack did not send us WebSocket PING for more than Client.maxPingInterval.
+	// We can use `<-smc.pingTimeout.C` to wait for the timeout.
+	info, conn, err := smc.connect(ctx, connectionCount, pingHandler)
+	if err != nil {
+		// when the connection is unsuccessful its fatal, and we need to bail out.
+		smc.Debugf("Failed to connect with Socket Mode on try %d: %s", connectionCount, err)
+
+		return err
+	}
+
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	smc.sendEvent(ctx, newEvent(EventTypeConnected, &ConnectedEvent{
+		ConnectionCount: connectionCount,
+		Info:            info,
+	}))
+
+	smc.Debugf("WebSocket connection succeeded on try %d", connectionCount)
+
+	// We're now connected so we can set up listeners
+
+	wg := new(sync.WaitGroup)
+	// sendErr relies on the buffer of 1 here
+	errc := make(chan error, 1)
+	sendErr := func(err error) {
+		select {
+		case errc <- err:
+		default:
+		}
+	}
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		// The response sender sends Socket Mode responses over the WebSocket conn
+		if err := smc.runResponseSender(ctx, conn); err != nil {
+			sendErr(err)
+		}
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		// The handler reads Socket Mode requests, and enqueues responses for sending by the response sender
+		if err := smc.runRequestHandler(ctx, messages); err != nil {
+			sendErr(err)
+		}
+	}()
+
+	go func() {
+		defer cancel()
+		// We close messages here as it is the producer for the channel.
+		defer close(messages)
+
+		// The receiver reads WebSocket messages, and enqueues parsed Socket Mode requests to be handled by
+		// the request handler
+		if err := smc.runMessageReceiver(ctx, conn, messages); err != nil {
+			sendErr(err)
+		}
+	}()
+
+	wg.Add(1)
+	go func(pingInterval time.Duration) {
+		defer wg.Done()
+		defer func() {
+			// Detect when the connection is dead and try close connection.
+			if err := conn.Close(); err != nil {
+				smc.Debugf("Failed to close connection: %v", err)
+			}
+		}()
+
+		done := ctx.Done()
+		var lastPing time.Time
+
+		// More efficient than constantly resetting a timer w/ Stop+Reset
+		ticker := time.NewTicker(pingInterval)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-done:
+				return
+
+			case lastPing = <-pingChan:
+				// This case gets the time of the last ping.
+				// If this case never fires then the pingHandler was never called
+				// in which case lastPing is the zero time.Time value, and will 'fail'
+				// the next tick, causing us to exit.
+
+			case now := <-ticker.C:
+				// Our last ping is older than our interval
+				if now.Sub(lastPing) > pingInterval {
+					sendErr(errors.New("ping timeout: Slack did not send us WebSocket PING for more than Client.maxInterval"))
+
+					cancel()
+					return
+				}
+			}
+		}
+	}(smc.maxPingInterval)
+
+	wg.Wait()
+
+	select {
+	case err = <-errc:
+		// Get buffered error
+	default:
+		// Or nothing if they all exited nil
+	}
+
+	if errors.Is(err, context.Canceled) {
+		return err
+	}
+
+	// wg.Wait() finishes only after any of the above go routines finishes and cancels the
+	// context, allowing the other threads to shut down gracefully.
+	// Also, we can expect our (first)err to be not nil, as goroutines can finish only on error.
+	smc.Debugf("Reconnecting due to %v", err)
+
+	return nil
+}
+
+// connect attempts to connect to the slack websocket API. It handles any
+// errors that occur while connecting and will return once a connection
+// has been successfully opened.
+func (smc *Client) connect(ctx context.Context, connectionCount int, additionalPingHandler func(string) error) (*slack.SocketModeConnection, *websocket.Conn, error) {
+	const (
+		errInvalidAuth      = "invalid_auth"
+		errInactiveAccount  = "account_inactive"
+		errMissingAuthToken = "not_authed"
+		errTokenRevoked     = "token_revoked"
+	)
+
+	// used to provide exponential backoff wait time with jitter before trying
+	// to connect to slack again
+	boff := &backoff.Backoff{
+		Max: 5 * time.Minute,
+	}
+
+	for {
+		var (
+			backoff time.Duration
+		)
+
+		// send connecting event
+		smc.sendEvent(ctx, newEvent(EventTypeConnecting, &slack.ConnectingEvent{
+			Attempt:         boff.Attempts() + 1,
+			ConnectionCount: connectionCount,
+		}))
+
+		// attempt to start the connection
+		info, conn, err := smc.openAndDial(ctx, additionalPingHandler)
+		if err == nil {
+			return info, conn, nil
+		}
+
+		// check for fatal errors
+		switch err.Error() {
+		case errInvalidAuth, errInactiveAccount, errMissingAuthToken, errTokenRevoked:
+			smc.Debugf("invalid auth when connecting with SocketMode: %s", err)
+			return nil, nil, err
+		default:
+		}
+
+		var (
+			actual  slack.StatusCodeError
+			rlError *slack.RateLimitedError
+		)
+
+		if errors.As(err, &actual) && actual.Code == http.StatusNotFound {
+			smc.Debugf("invalid auth when connecting with Socket Mode: %s", err)
+			smc.sendEvent(ctx, newEvent(EventTypeInvalidAuth, &slack.InvalidAuthEvent{}))
+
+			return nil, nil, err
+		} else if errors.As(err, &rlError) {
+			backoff = rlError.RetryAfter
+		}
+
+		// If we check for errors.Is(err, context.Canceled) here and
+		// return early then we don't send the Event below that some users
+		// may already rely on; ie a behavior change.
+
+		backoff = timex.Max(backoff, boff.Duration())
+		// any other errors are treated as recoverable and we try again after
+		// sending the event along the Events channel
+		smc.sendEvent(ctx, newEvent(EventTypeConnectionError, &slack.ConnectionErrorEvent{
+			Attempt:  boff.Attempts(),
+			Backoff:  backoff,
+			ErrorObj: err,
+		}))
+
+		// get time we should wait before attempting to connect again
+		smc.Debugf("reconnection %d failed: %s reconnecting in %v\n", boff.Attempts(), err, backoff)
+
+		// wait for one of the following to occur,
+		// backoff duration has elapsed, disconnectCh is signalled, or
+		// the smc finishes disconnecting.
+		timer := time.NewTimer(backoff)
+		select {
+		case <-timer.C: // retry after the backoff.
+		case <-ctx.Done():
+			timer.Stop()
+			return nil, nil, ctx.Err()
+		}
+	}
+}
+
+// openAndDial attempts to open a Socket Mode connection and dial to the connection endpoint using WebSocket.
+// It returns the  full information returned by the "apps.connections.open" method on the
+// Slack API.
+func (smc *Client) openAndDial(ctx context.Context, additionalPingHandler func(string) error) (info *slack.SocketModeConnection, _ *websocket.Conn, err error) {
+	var (
+		url string
+	)
+
+	smc.Debugf("Starting SocketMode")
+	info, url, err = smc.OpenContext(ctx)
+
+	if err != nil {
+		smc.Debugf("Failed to start or connect with SocketMode: %s", err)
+		return nil, nil, err
+	}
+
+	smc.Debugf("Dialing to websocket on url %s", url)
+	// Only use HTTPS for connections to prevent MITM attacks on the connection.
+	upgradeHeader := http.Header{}
+	upgradeHeader.Add("Origin", "https://api.slack.com")
+	dialer := websocket.DefaultDialer
+	if smc.dialer != nil {
+		dialer = smc.dialer
+	}
+	conn, _, err := dialer.DialContext(ctx, url, upgradeHeader)
+	if err != nil {
+		smc.Debugf("Failed to dial to the websocket: %s", err)
+		return nil, nil, err
+	}
+	if additionalPingHandler == nil {
+		additionalPingHandler = func(_ string) error { return nil }
+	}
+
+	conn.SetPingHandler(func(appData string) error {
+		if err := additionalPingHandler(appData); err != nil {
+			return err
+		}
+
+		smc.handlePing(conn, appData)
+
+		return nil
+	})
+
+	// We don't need to conn.SetCloseHandler because the default handler is effective enough that
+	// it sends back the CLOSE message to the server and let conn.ReadJSON() fail with CloseError.
+	// The CloseError must be handled normally in our receiveMessagesInto function.
+	//conn.SetCloseHandler(func(code int, text string) error {
+	//  ...
+	// })
+
+	return info, conn, err
+}
+
+// runResponseSender runs the handler that reads Socket Mode responses enqueued onto Client.socketModeResponses channel
+// and sends them one by one over the WebSocket connection.
+// Gorilla WebSocket is not goroutine safe hence this needs to be the single place you write to the WebSocket connection.
+func (smc *Client) runResponseSender(ctx context.Context, conn *websocket.Conn) error {
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		// 3. listen for messages that need to be sent
+		case res := <-smc.socketModeResponses:
+			smc.Debugf("Sending Socket Mode response with envelope ID %q: %v", res.EnvelopeID, res)
+
+			if err := unsafeWriteSocketModeResponse(conn, res); err != nil {
+				smc.sendEvent(ctx, newEvent(EventTypeErrorWriteFailed, &ErrorWriteFailed{
+					Cause:    err,
+					Response: res,
+				}))
+			}
+
+			smc.Debugf("Finished sending Socket Mode response with envelope ID %q", res.EnvelopeID)
+		}
+	}
+}
+
+// runRequestHandler is a blocking function that runs the Socket Mode request receiver.
+//
+// It reads WebSocket messages sent from Slack's Socket Mode WebSocket connection,
+// parses them as Socket Mode requests, and processes them and optionally emit our own events into Client.Events channel.
+func (smc *Client) runRequestHandler(ctx context.Context, websocket chan json.RawMessage) error {
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case message, ok := <-websocket:
+			if !ok {
+				// The producer closed the channel because it encountered an error (or panic),
+				// we need only return.
+				return nil
+			}
+
+			smc.Debugf("Received WebSocket message: %s", message)
+
+			// listen for incoming messages that need to be parsed
+			evt, err := smc.parseEvent(message)
+			if err != nil {
+				smc.sendEvent(ctx, newEvent(EventTypeErrorBadMessage, &ErrorBadMessage{
+					Cause:   err,
+					Message: message,
+				}))
+			} else if evt != nil {
+				if evt.Type == EventTypeDisconnect {
+					// We treat the `disconnect` request from Slack as an error internally,
+					// so that we can tell the consumer of this function to reopen the connection on it.
+					return errorRequestedDisconnect{}
+				}
+
+				smc.sendEvent(ctx, *evt)
+			}
+		}
+	}
+}
+
+// runMessageReceiver monitors the Socket Mode opened WebSocket connection for any incoming
+// messages. It pushes the raw events into the channel.
+// The receiver runs until the context is closed.
+func (smc *Client) runMessageReceiver(ctx context.Context, conn *websocket.Conn, sink chan json.RawMessage) error {
+	for {
+		if err := smc.receiveMessagesInto(ctx, conn, sink); err != nil {
+			return err
+		}
+	}
+}
+
+// unsafeWriteSocketModeResponse sends a WebSocket message back to Slack.
+// WARNING: Call to this function must be serialized!
+//
+// Here's why - Gorilla WebSocket's Writes functions are not concurrency-safe.
+// That is, we must serialize all the writes to it with e.g. a goroutine or mutex.
+// We intentionally chose to use goroutine, which makes it harder to propagate write errors to the caller,
+// but is more computationally efficient.
+//
+// See the below for more information on this topic:
+// https://stackoverflow.com/questions/43225340/how-to-ensure-concurrency-in-golang-gorilla-websocket-package
+func unsafeWriteSocketModeResponse(conn *websocket.Conn, res *Response) error {
+	// set a write deadline on the connection
+	if err := conn.SetWriteDeadline(time.Now().Add(10 * time.Second)); err != nil {
+		return err
+	}
+
+	// Remove write deadline regardless of WriteJSON succeeds or not
+	defer conn.SetWriteDeadline(time.Time{})
+
+	return conn.WriteJSON(res)
+}
+
+func newEvent(tpe EventType, data interface{}, req ...*Request) Event {
+	evt := Event{Type: tpe, Data: data}
+
+	if len(req) > 0 {
+		evt.Request = req[0]
+	}
+
+	return evt
+}
+
+// Ack acknowledges the Socket Mode request with the payload.
+//
+// This tells Slack that the we have received the request denoted by the envelope ID,
+// by sending back the envelope ID over the WebSocket connection.
+func (smc *Client) Ack(req Request, payload ...interface{}) {
+	var pld interface{}
+	if len(payload) > 0 {
+		pld = payload[0]
+	}
+
+	smc.AckCtx(context.TODO(), req.EnvelopeID, pld)
+}
+
+// AckCtx acknowledges the Socket Mode request envelope ID with the payload.
+//
+// This tells Slack that the we have received the request denoted by the request (envelope) ID,
+// by sending back the ID over the WebSocket connection.
+func (smc *Client) AckCtx(ctx context.Context, reqID string, payload interface{}) error {
+	return smc.SendCtx(ctx, Response{
+		EnvelopeID: reqID,
+		Payload:    payload,
+	})
+}
+
+// Send sends the Socket Mode response over a WebSocket connection.
+// This is usually used for acknowledging requests, but if you need more control over Client.Ack().
+// It's normally recommended to use Client.Ack() instead of this.
+func (smc *Client) Send(res Response) {
+	smc.SendCtx(context.TODO(), res)
+}
+
+// SendCtx sends the Socket Mode response over a WebSocket connection.
+// This is usually used for acknowledging requests, but if you need more control
+// it's normally recommended to use Client.AckCtx() instead of this.
+func (smc *Client) SendCtx(ctx context.Context, res Response) error {
+	if smc.debug {
+		js, err := json.Marshal(res)
+
+		// Log the error so users of `Send` don't see it entirely disappear as that method
+		// does not return an error and used to panic on failure (with or without debug)
+		smc.Debugf("Scheduling Socket Mode response (error: %v) for envelope ID %s: %s", err, res.EnvelopeID, js)
+		if err != nil {
+			return err
+		}
+	}
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case smc.socketModeResponses <- &res:
+	}
+
+	return nil
+}
+
+// receiveMessagesInto attempts to receive an event from the WebSocket connection for Socket Mode.
+// This will block until a frame is available from the WebSocket.
+// If the read from the WebSocket results in a fatal error, this function will return non-nil.
+func (smc *Client) receiveMessagesInto(ctx context.Context, conn *websocket.Conn, sink chan json.RawMessage) error {
+	smc.Debugf("Starting to receive message")
+	defer smc.Debugf("Finished to receive message")
+
+	event := json.RawMessage{}
+	err := conn.ReadJSON(&event)
+	if err != nil {
+		// check if the connection was closed.
+		// This version of the gorilla/websocket package also does a type assertion
+		// on the error, rather than unwrapping it, so we'll do the unwrapping then pass
+		// the unwrapped error
+		var wsErr *websocket.CloseError
+		if errors.As(err, &wsErr) && websocket.IsUnexpectedCloseError(wsErr) {
+			return err
+		}
+
+		if errors.Is(err, io.ErrUnexpectedEOF) {
+			// EOF's don't seem to signify a failed connection so instead we ignore
+			// them here and detect a failed connection upon attempting to send a
+			// 'PING' message
+
+			// Unlike RTM, we don't ping from the our end as there seem to have no client ping.
+			// We just continue to the next loop so that we `smc.disconnected` should be received if
+			// this EOF error was actually due to disconnection.
+
+			return nil
+		}
+
+		// All other errors from ReadJSON come from NextReader, and should
+		// kill the read loop and force a reconnect.
+		// TODO: Unless it's a JSON unmarshal-type error in which case maybe reconnecting isn't needed...
+		smc.sendEvent(ctx, newEvent(EventTypeIncomingError, &slack.IncomingEventError{
+			ErrorObj: err,
+		}))
+
+		return err
+	}
+
+	if smc.debug {
+		buf := &bytes.Buffer{}
+		d := json.NewEncoder(buf)
+		d.SetIndent("", "  ")
+		if err := d.Encode(event); err != nil {
+			smc.Debugln("Failed encoding decoded json:", err)
+		}
+		reencoded := buf.String()
+
+		smc.Debugln("Incoming WebSocket message:", reencoded)
+	}
+
+	select {
+	case sink <- event:
+	case <-ctx.Done():
+		smc.Debugln("cancelled while attempting to send raw event")
+
+		return ctx.Err()
+	}
+
+	return nil
+}
+
+// parseEvent takes a raw JSON message received from the slack websocket
+// and handles the encoded event.
+// returns the our own event that wraps the socket mode request.
+func (smc *Client) parseEvent(wsMsg json.RawMessage) (*Event, error) {
+	req := &Request{}
+	err := json.Unmarshal(wsMsg, req)
+	if err != nil {
+		return nil, fmt.Errorf("unmarshalling WebSocket message: %w", err)
+	}
+
+	var evt Event
+
+	// See below two links for all the available message types.
+	// - https://github.com/slackapi/node-slack-sdk/blob/c3f4d7109062a0356fb765d53794b7b5f6b3b5ae/packages/socket-mode/src/SocketModeClient.ts#L533
+	// - https://api.slack.com/apis/connections/socket-implement
+	switch req.Type {
+	case RequestTypeHello:
+		evt = newEvent(EventTypeHello, nil, req)
+	case RequestTypeEventsAPI:
+		payloadEvent := req.Payload
+
+		eventsAPIEvent, err := slackevents.ParseEvent(payloadEvent, slackevents.OptionNoVerifyToken())
+		if err != nil {
+			return nil, fmt.Errorf("parsing Events API event: %w", err)
+		}
+
+		evt = newEvent(EventTypeEventsAPI, eventsAPIEvent, req)
+	case RequestTypeDisconnect:
+		// See https://api.slack.com/apis/connections/socket-implement#disconnect
+
+		evt = newEvent(EventTypeDisconnect, nil, req)
+	case RequestTypeSlashCommands:
+		// See https://api.slack.com/apis/connections/socket-implement#command
+		var cmd slack.SlashCommand
+
+		if err := json.Unmarshal(req.Payload, &cmd); err != nil {
+			return nil, fmt.Errorf("parsing slash command: %w", err)
+		}
+
+		evt = newEvent(EventTypeSlashCommand, cmd, req)
+	case RequestTypeInteractive:
+		// See belows:
+		// - https://api.slack.com/apis/connections/socket-implement#button
+		// - https://api.slack.com/apis/connections/socket-implement#home
+		// - https://api.slack.com/apis/connections/socket-implement#modal
+		// - https://api.slack.com/apis/connections/socket-implement#menu
+
+		var callback slack.InteractionCallback
+
+		if err := json.Unmarshal(req.Payload, &callback); err != nil {
+			return nil, fmt.Errorf("parsing interaction callback: %w", err)
+		}
+
+		evt = newEvent(EventTypeInteractive, callback, req)
+	default:
+		return nil, fmt.Errorf("processing WebSocket message: encountered unsupported type %q", req.Type)
+	}
+
+	return &evt, nil
+}
+
+// handlePing handles an incoming 'PONG' message which should be in response to
+// a previously sent 'PING' message. This is then used to compute the
+// connection's latency.
+func (smc *Client) handlePing(conn *websocket.Conn, event string) {
+	smc.Debugf("WebSocket ping message received: %s", event)
+
+	// In WebSocket, we need to respond a PING from the server with a PONG with the same payload as the PING.
+	if err := conn.WriteControl(websocket.PongMessage, []byte(event), time.Now().Add(10*time.Second)); err != nil {
+		smc.Debugf("Failed writing WebSocket PONG message: %v", err)
+	}
+}

vendor/github.com/slack-go/slack/socketmode/socketmode.go

@@ -0,0 +1,133 @@
+package socketmode
+
+import (
+	"context"
+	"log"
+	"os"
+	"time"
+
+	"github.com/gorilla/websocket"
+
+	"github.com/slack-go/slack"
+)
+
+// EventType is the type of events that are emitted by scoketmode.Client.
+// You receive and handle those events from a socketmode.Client.Events channel.
+// Those event types does not necessarily match 1:1 to those of Slack Events API events.
+type EventType string
+
+const (
+	// The following request types are the types of requests sent from Slack via Socket Mode WebSocket connection
+	// and handled internally by the socketmode.Client.
+	// The consumer of socketmode.Client will never see it.
+
+	RequestTypeHello         = "hello"
+	RequestTypeEventsAPI     = "events_api"
+	RequestTypeDisconnect    = "disconnect"
+	RequestTypeSlashCommands = "slash_commands"
+	RequestTypeInteractive   = "interactive"
+
+	// The following event types are for events emitted by socketmode.Client itself and
+	// does not originate from Slack.
+	EventTypeConnecting       = EventType("connecting")
+	EventTypeInvalidAuth      = EventType("invalid_auth")
+	EventTypeConnectionError  = EventType("connection_error")
+	EventTypeConnected        = EventType("connected")
+	EventTypeIncomingError    = EventType("incoming_error")
+	EventTypeErrorWriteFailed = EventType("write_error")
+	EventTypeErrorBadMessage  = EventType("error_bad_message")
+
+	//
+	// The following event types are guaranteed to not change unless Slack changes
+	//
+
+	EventTypeHello        = EventType("hello")
+	EventTypeDisconnect   = EventType("disconnect")
+	EventTypeEventsAPI    = EventType("events_api")
+	EventTypeInteractive  = EventType("interactive")
+	EventTypeSlashCommand = EventType("slash_commands")
+
+	websocketDefaultTimeout = 10 * time.Second
+	defaultMaxPingInterval  = 30 * time.Second
+)
+
+// Open calls the "apps.connections.open" endpoint and returns the provided URL and the full Info block.
+//
+// To have a fully managed Websocket connection, use `New`, and call `Run()` on it.
+func (smc *Client) Open() (info *slack.SocketModeConnection, websocketURL string, err error) {
+	ctx, cancel := context.WithTimeout(context.Background(), websocketDefaultTimeout)
+	defer cancel()
+
+	return smc.StartSocketModeContext(ctx)
+}
+
+// OpenContext calls the "apps.connections.open" endpoint and returns the provided URL and the full Info block.
+//
+// To have a fully managed Websocket connection, use `New`, and call `Run()` on it.
+func (smc *Client) OpenContext(ctx context.Context) (info *slack.SocketModeConnection, websocketURL string, err error) {
+	return smc.StartSocketModeContext(ctx)
+}
+
+// Option options for the managed Client.
+type Option func(client *Client)
+
+// OptionDialer takes a gorilla websocket Dialer and uses it as the
+// Dialer when opening the websocket for the Socket Mode connection.
+func OptionDialer(d *websocket.Dialer) Option {
+	return func(smc *Client) {
+		smc.dialer = d
+	}
+}
+
+// OptionPingInterval determines how often we expect Slack to deliver WebSocket ping to us.
+// If no ping is delivered to us within this interval after the last ping, we assumes the WebSocket connection
+// is dead and needs to be reconnected.
+func OptionPingInterval(d time.Duration) Option {
+	return func(smc *Client) {
+		smc.maxPingInterval = d
+	}
+}
+
+// OptionDebug enable debugging for the client
+func OptionDebug(b bool) func(*Client) {
+	return func(c *Client) {
+		c.debug = b
+	}
+}
+
+// OptionLog set logging for client.
+func OptionLog(l logger) func(*Client) {
+	return func(c *Client) {
+		c.log = internalLog{logger: l}
+	}
+}
+
+// New returns a Socket Mode client which provides a fully managed connection to
+// Slack's Websocket-based Socket Mode.
+func New(api *slack.Client, options ...Option) *Client {
+	result := &Client{
+		Client:              *api,
+		Events:              make(chan Event, 50),
+		socketModeResponses: make(chan *Response, 20),
+		maxPingInterval:     defaultMaxPingInterval,
+		log:                 log.New(os.Stderr, "slack-go/slack/socketmode", log.LstdFlags|log.Lshortfile),
+	}
+
+	for _, opt := range options {
+		opt(result)
+	}
+
+	return result
+}
+
+// sendEvent safely sends an event into the Clients Events channel
+// and blocks until buffer space is had, or the context is canceled.
+// This prevents deadlocking in the event that Events buffer is full,
+// other goroutines are waiting, and/or timing allows receivers to exit
+// before all senders are finished.
+func (smc *Client) sendEvent(ctx context.Context, event Event) {
+	select {
+	case smc.Events <- event:
+	case <-ctx.Done():
+	}
+}

vendor/github.com/slack-go/slack/socketmode/socketmode_handler.go

@@ -0,0 +1,260 @@
+package socketmode
+
+import (
+	"context"
+	"github.com/slack-go/slack"
+	"github.com/slack-go/slack/slackevents"
+)
+
+type SocketmodeHandler struct {
+	Client *Client
+
+	//lvl 1 - the most generic type of event
+	EventMap map[EventType][]SocketmodeHandlerFunc
+	//lvl 2 - Manage event by inner type
+	InteractionEventMap map[slack.InteractionType][]SocketmodeHandlerFunc
+	EventApiMap         map[slackevents.EventsAPIType][]SocketmodeHandlerFunc
+	//lvl 3 - the most userfriendly way of managing event
+	InteractionBlockActionEventMap map[string]SocketmodeHandlerFunc
+	SlashCommandMap                map[string]SocketmodeHandlerFunc
+
+	Default SocketmodeHandlerFunc
+}
+
+// Handler have access to the event and socketmode client
+type SocketmodeHandlerFunc func(*Event, *Client)
+
+// Middleware accept SocketmodeHandlerFunc, and return SocketmodeHandlerFunc
+type SocketmodeMiddlewareFunc func(SocketmodeHandlerFunc) SocketmodeHandlerFunc
+
+// Initialization constructor for SocketmodeHandler
+func NewSocketmodeHandler(client *Client) *SocketmodeHandler {
+	eventMap := make(map[EventType][]SocketmodeHandlerFunc)
+	interactionEventMap := make(map[slack.InteractionType][]SocketmodeHandlerFunc)
+	eventApiMap := make(map[slackevents.EventsAPIType][]SocketmodeHandlerFunc)
+
+	interactionBlockActionEventMap := make(map[string]SocketmodeHandlerFunc)
+	slackCommandMap := make(map[string]SocketmodeHandlerFunc)
+
+	return &SocketmodeHandler{
+		Client:                         client,
+		EventMap:                       eventMap,
+		EventApiMap:                    eventApiMap,
+		InteractionEventMap:            interactionEventMap,
+		InteractionBlockActionEventMap: interactionBlockActionEventMap,
+		SlashCommandMap:                slackCommandMap,
+		Default: func(e *Event, c *Client) {
+			c.log.Printf("Unexpected event type received: %v\n", e.Type)
+		},
+	}
+}
+
+// Register a middleware or handler for an Event from socketmode
+// This most general entrypoint
+func (r *SocketmodeHandler) Handle(et EventType, f SocketmodeHandlerFunc) {
+	r.EventMap[et] = append(r.EventMap[et], f)
+}
+
+// Register a middleware or handler for an Interaction
+// There is several types of interactions, decated functions lets you better handle them
+// See
+// * HandleInteractionBlockAction
+// * (Not Implemented) HandleShortcut
+// * (Not Implemented) HandleView
+func (r *SocketmodeHandler) HandleInteraction(et slack.InteractionType, f SocketmodeHandlerFunc) {
+	r.InteractionEventMap[et] = append(r.InteractionEventMap[et], f)
+}
+
+// Register a middleware or handler for a Block Action referenced by its ActionID
+func (r *SocketmodeHandler) HandleInteractionBlockAction(actionID string, f SocketmodeHandlerFunc) {
+	if actionID == "" {
+		panic("invalid command cannot be empty")
+	}
+	if f == nil {
+		panic("invalid handler cannot be nil")
+	}
+	if _, exist := r.InteractionBlockActionEventMap[actionID]; exist {
+		panic("multiple registrations for actionID" + actionID)
+	}
+	r.InteractionBlockActionEventMap[actionID] = f
+}
+
+// Register a middleware or handler for an Event (from slackevents)
+func (r *SocketmodeHandler) HandleEvents(et slackevents.EventsAPIType, f SocketmodeHandlerFunc) {
+	r.EventApiMap[et] = append(r.EventApiMap[et], f)
+}
+
+// Register a middleware or handler for a Slash Command
+func (r *SocketmodeHandler) HandleSlashCommand(command string, f SocketmodeHandlerFunc) {
+	if command == "" {
+		panic("invalid command cannot be empty")
+	}
+	if f == nil {
+		panic("invalid handler cannot be nil")
+	}
+	if _, exist := r.SlashCommandMap[command]; exist {
+		panic("multiple registrations for command" + command)
+	}
+	r.SlashCommandMap[command] = f
+}
+
+// Register a middleware or handler to use as a last resort
+func (r *SocketmodeHandler) HandleDefault(f SocketmodeHandlerFunc) {
+	r.Default = f
+}
+
+// RunSlackEventLoop receives the event via the socket
+func (r *SocketmodeHandler) RunEventLoop() error {
+
+	go r.runEventLoop(context.Background())
+
+	return r.Client.Run()
+}
+
+func (r *SocketmodeHandler) RunEventLoopContext(ctx context.Context) error {
+	go r.runEventLoop(ctx)
+
+	return r.Client.RunContext(ctx)
+}
+
+// Call the dispatcher for each incomming event
+func (r *SocketmodeHandler) runEventLoop(ctx context.Context) {
+	for {
+		select {
+		case evt, ok := <-r.Client.Events:
+			if !ok {
+				return
+			}
+
+			r.dispatcher(evt)
+
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+// Dispatch events to the specialized dispatcher
+func (r *SocketmodeHandler) dispatcher(evt Event) {
+	var ishandled bool
+
+	// Some eventType can be further decomposed
+	switch evt.Type {
+	case EventTypeInteractive:
+		ishandled = r.interactionDispatcher(&evt)
+	case EventTypeEventsAPI:
+		ishandled = r.eventAPIDispatcher(&evt)
+	case EventTypeSlashCommand:
+		ishandled = r.slashCommandDispatcher(&evt)
+	default:
+		ishandled = r.socketmodeDispatcher(&evt)
+	}
+
+	if !ishandled {
+		go r.Default(&evt, r.Client)
+	}
+}
+
+// Dispatch socketmode events to the registered middleware
+func (r *SocketmodeHandler) socketmodeDispatcher(evt *Event) bool {
+	if handlers, ok := r.EventMap[evt.Type]; ok {
+		// If we registered an event
+		for _, f := range handlers {
+			go f(evt, r.Client)
+		}
+
+		return true
+	}
+
+	return false
+}
+
+// Dispatch interactions to the registered middleware
+func (r *SocketmodeHandler) interactionDispatcher(evt *Event) bool {
+	var ishandled bool = false
+
+	interaction, ok := evt.Data.(slack.InteractionCallback)
+	if !ok {
+		r.Client.log.Printf("Ignored %+v\n", evt)
+		return false
+	}
+
+	// Level 1 - socketmode EventType
+	ishandled = r.socketmodeDispatcher(evt)
+
+	// Level 2 - interaction EventType
+	if handlers, ok := r.InteractionEventMap[interaction.Type]; ok {
+		// If we registered an event
+		for _, f := range handlers {
+			go f(evt, r.Client)
+		}
+
+		ishandled = true
+	}
+
+	// Level 3 - interaction with actionID
+	blockActions := interaction.ActionCallback.BlockActions
+	// outmoded approach won`t be implemented
+	// attachments_actions := interaction.ActionCallback.AttachmentActions
+
+	for _, action := range blockActions {
+		if handler, ok := r.InteractionBlockActionEventMap[action.ActionID]; ok {
+
+			go handler(evt, r.Client)
+
+			ishandled = true
+		}
+	}
+	return ishandled
+}
+
+// Dispatch eventAPI events to the registered middleware
+func (r *SocketmodeHandler) eventAPIDispatcher(evt *Event) bool {
+	var ishandled bool = false
+	eventsAPIEvent, ok := evt.Data.(slackevents.EventsAPIEvent)
+	if !ok {
+		r.Client.log.Printf("Ignored %+v\n", evt)
+		return false
+	}
+
+	innerEventType := slackevents.EventsAPIType(eventsAPIEvent.InnerEvent.Type)
+
+	// Level 1 - socketmode EventType
+	ishandled = r.socketmodeDispatcher(evt)
+
+	// Level 2 - EventAPI EventType
+	if handlers, ok := r.EventApiMap[innerEventType]; ok {
+		// If we registered an event
+		for _, f := range handlers {
+			go f(evt, r.Client)
+		}
+
+		ishandled = true
+	}
+
+	return ishandled
+}
+
+// Dispatch SlashCommands events to the registered middleware
+func (r *SocketmodeHandler) slashCommandDispatcher(evt *Event) bool {
+	var ishandled bool = false
+	slashCommandEvent, ok := evt.Data.(slack.SlashCommand)
+	if !ok {
+		r.Client.log.Printf("Ignored %+v\n", evt)
+		return false
+	}
+
+	// Level 1 - socketmode EventType
+	ishandled = r.socketmodeDispatcher(evt)
+
+	// Level 2 - SlackCommand by name
+	if handler, ok := r.SlashCommandMap[slashCommandEvent.Command]; ok {
+
+		go handler(evt, r.Client)
+
+		ishandled = true
+	}
+
+	return ishandled
+
+}

vendor/modules.txt

@@ -381,7 +381,9 @@ github.com/slack-go/slack
 github.com/slack-go/slack/internal/backoff
 github.com/slack-go/slack/internal/errorsx
 github.com/slack-go/slack/internal/timex
+github.com/slack-go/slack/slackevents
 github.com/slack-go/slack/slackutilsx
+github.com/slack-go/slack/socketmode
 # github.com/sourcegraph/conc v0.3.0
 ## explicit; go 1.19
 github.com/sourcegraph/conc