Update dependencies (#886)

vendor/github.com/nlopes/slack/interactions.go

@@ -1,8 +1,20 @@
 package slack
 
+import (
+	"encoding/json"
+)
+
 // InteractionType type of interactions
 type InteractionType string
 
+// ActionType type represents the type of action (attachment, block, etc.)
+type actionType string
+
+// action is an interface that should be implemented by all callback action types
+type action interface {
+	actionType() actionType
+}
+
 // Types of interactions that can be received.
 const (
 	InteractionTypeDialogCancellation = InteractionType("dialog_cancellation")
@@ -10,6 +22,7 @@ const (
 	InteractionTypeDialogSuggestion   = InteractionType("dialog_suggestion")
 	InteractionTypeInteractionMessage = InteractionType("interactive_message")
 	InteractionTypeMessageAction      = InteractionType("message_action")
+	InteractionTypeBlockActions       = InteractionType("block_actions")
 )
 
 // InteractionCallback is sent from slack when a user interactions with a button or dialog.
@@ -27,6 +40,59 @@ type InteractionCallback struct {
 	Message         Message         `json:"message"`
 	Name            string          `json:"name"`
 	Value           string          `json:"value"`
-	ActionCallback
+	MessageTs       string          `json:"message_ts"`
+	AttachmentID    string          `json:"attachment_id"`
+	ActionCallback  ActionCallbacks `json:"actions"`
 	DialogSubmissionCallback
 }
+
+// ActionCallback is a convenience struct defined to allow dynamic unmarshalling of
+// the "actions" value in Slack's JSON response, which varies depending on block type
+type ActionCallbacks struct {
+	AttachmentActions []*AttachmentAction
+	BlockActions      []*BlockAction
+}
+
+// UnmarshalJSON implements the Marshaller interface in order to delegate
+// marshalling and allow for proper type assertion when decoding the response
+func (a *ActionCallbacks) UnmarshalJSON(data []byte) error {
+	var raw []json.RawMessage
+	err := json.Unmarshal(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	for _, r := range raw {
+		var obj map[string]interface{}
+		err := json.Unmarshal(r, &obj)
+		if err != nil {
+			return err
+		}
+
+		if _, ok := obj["block_id"].(string); ok {
+			action, err := unmarshalAction(r, &BlockAction{})
+			if err != nil {
+				return err
+			}
+
+			a.BlockActions = append(a.BlockActions, action.(*BlockAction))
+			return nil
+		}
+
+		action, err := unmarshalAction(r, &AttachmentAction{})
+		if err != nil {
+			return err
+		}
+		a.AttachmentActions = append(a.AttachmentActions, action.(*AttachmentAction))
+	}
+
+	return nil
+}
+
+func unmarshalAction(r json.RawMessage, callbackAction action) (action, error) {
+	err := json.Unmarshal(r, callbackAction)
+	if err != nil {
+		return nil, err
+	}
+	return callbackAction, nil
+}