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package slack
import (
"bytes"
"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")
InteractionTypeDialogSubmission = InteractionType("dialog_submission")
InteractionTypeDialogSuggestion = InteractionType("dialog_suggestion")
InteractionTypeInteractionMessage = InteractionType("interactive_message")
InteractionTypeMessageAction = InteractionType("message_action")
InteractionTypeBlockActions = InteractionType("block_actions")
InteractionTypeBlockSuggestion = InteractionType("block_suggestion")
InteractionTypeViewSubmission = InteractionType("view_submission")
InteractionTypeViewClosed = InteractionType("view_closed")
InteractionTypeShortcut = InteractionType("shortcut")
)
// InteractionCallback is sent from slack when a user interactions with a button or dialog.
type InteractionCallback struct {
Type InteractionType `json:"type"`
Token string `json:"token"`
CallbackID string `json:"callback_id"`
ResponseURL string `json:"response_url"`
TriggerID string `json:"trigger_id"`
ActionTs string `json:"action_ts"`
Team Team `json:"team"`
Channel Channel `json:"channel"`
User User `json:"user"`
OriginalMessage Message `json:"original_message"`
Message Message `json:"message"`
Name string `json:"name"`
Value string `json:"value"`
MessageTs string `json:"message_ts"`
AttachmentID string `json:"attachment_id"`
ActionCallback ActionCallbacks `json:"actions"`
View View `json:"view"`
ActionID string `json:"action_id"`
APIAppID string `json:"api_app_id"`
BlockID string `json:"block_id"`
Container Container `json:"container"`
DialogSubmissionCallback
ViewSubmissionCallback
ViewClosedCallback
}
type Container struct {
Type string `json:"type"`
ViewID string `json:"view_id"`
MessageTs string `json:"message_ts"`
AttachmentID json.Number `json:"attachment_id"`
ChannelID string `json:"channel_id"`
IsEphemeral bool `json:"is_ephemeral"`
IsAppUnfurl bool `json:"is_app_unfurl"`
}
// 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
}
// MarshalJSON implements the Marshaller interface in order to combine both
// action callback types back into a single array, like how the api responds.
// This makes Marshaling and Unmarshaling an InteractionCallback symmetrical
func (a ActionCallbacks) MarshalJSON() ([]byte, error) {
count := 0
length := len(a.AttachmentActions) + len(a.BlockActions)
buffer := bytes.NewBufferString("[")
f := func(obj interface{}) error {
js, err := json.Marshal(obj)
if err != nil {
return err
}
_, err = buffer.Write(js)
if err != nil {
return err
}
count++
if count < length {
_, err = buffer.WriteString(",")
return err
}
return nil
}
for _, act := range a.AttachmentActions {
err := f(act)
if err != nil {
return nil, err
}
}
for _, blk := range a.BlockActions {
err := f(blk)
if err != nil {
return nil, err
}
}
buffer.WriteString("]")
return buffer.Bytes(), nil
}
// 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))
continue
}
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
}
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