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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
// FIXME(kanata2): just workaround for backward-compatibility.
// See also https://github.com/slack-go/slack/issues/816
RawState json.RawMessage `json:"state,omitempty"`
// BlockActionState stands for the `state` field in block_actions type.
// NOTE: InteractionCallback.State has a role for the state of dialog_submission type,
// so we cannot use this field for backward-compatibility for now.
BlockActionState *BlockActionStates `json:"-"`
}
type BlockActionStates struct {
Values map[string]map[string]BlockAction `json:"values"`
}
func (ic *InteractionCallback) MarshalJSON() ([]byte, error) {
type alias InteractionCallback
tmp := alias(*ic)
if tmp.Type == InteractionTypeBlockActions {
if tmp.BlockActionState == nil {
tmp.RawState = []byte(`{}`)
} else {
state, err := json.Marshal(tmp.BlockActionState.Values)
if err != nil {
return nil, err
}
tmp.RawState = []byte(`{"values":` + string(state) + `}`)
}
} else if ic.Type == InteractionTypeDialogSubmission {
tmp.RawState = []byte(tmp.State)
}
// Use pointer for go1.7
return json.Marshal(&tmp)
}
func (ic *InteractionCallback) UnmarshalJSON(b []byte) error {
type alias InteractionCallback
tmp := struct {
Type InteractionType `json:"type"`
*alias
}{
alias: (*alias)(ic),
}
if err := json.Unmarshal(b, &tmp); err != nil {
return err
}
*ic = InteractionCallback(*tmp.alias)
ic.Type = tmp.Type
if ic.Type == InteractionTypeBlockActions {
if len(ic.RawState) > 0 {
err := json.Unmarshal(ic.RawState, &ic.BlockActionState)
if err != nil {
return err
}
}
} else if ic.Type == InteractionTypeDialogSubmission {
ic.State = string(ic.RawState)
}
return nil
}
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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