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Copy pathblock_object.go
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248 lines (215 loc) · 7.19 KB
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package slack
import (
"encoding/json"
"errors"
)
// Block Objects are also known as Composition Objects
//
// For more information: https://api.slack.com/reference/messaging/composition-objects
// BlockObject defines an interface that all block object types should
// implement.
// @TODO: Is this interface needed?
// blockObject object types
const (
MarkdownType = "mrkdwn"
PlainTextType = "plain_text"
// The following objects don't actually have types and their corresponding
// const values are just for internal use
motConfirmation = "confirm"
motOption = "option"
motOptionGroup = "option_group"
)
type MessageObjectType string
type blockObject interface {
validateType() MessageObjectType
}
type BlockObjects struct {
TextObjects []*TextBlockObject
ConfirmationObjects []*ConfirmationBlockObject
OptionObjects []*OptionBlockObject
OptionGroupObjects []*OptionGroupBlockObject
}
// UnmarshalJSON implements the Unmarshaller interface for BlockObjects, so that any JSON
// unmarshalling is delegated and proper type determination can be made before unmarshal
func (b *BlockObjects) 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
}
blockObjectType := getBlockObjectType(obj)
switch blockObjectType {
case PlainTextType, MarkdownType:
object, err := unmarshalBlockObject(r, &TextBlockObject{})
if err != nil {
return err
}
b.TextObjects = append(b.TextObjects, object.(*TextBlockObject))
case motConfirmation:
object, err := unmarshalBlockObject(r, &ConfirmationBlockObject{})
if err != nil {
return err
}
b.ConfirmationObjects = append(b.ConfirmationObjects, object.(*ConfirmationBlockObject))
case motOption:
object, err := unmarshalBlockObject(r, &OptionBlockObject{})
if err != nil {
return err
}
b.OptionObjects = append(b.OptionObjects, object.(*OptionBlockObject))
case motOptionGroup:
object, err := unmarshalBlockObject(r, &OptionGroupBlockObject{})
if err != nil {
return err
}
b.OptionGroupObjects = append(b.OptionGroupObjects, object.(*OptionGroupBlockObject))
}
}
return nil
}
// Ideally would have a better way to identify the block objects for
// type casting at time of unmarshalling, should be adapted if possible
// to accomplish in a more reliable manner.
func getBlockObjectType(obj map[string]interface{}) string {
if t, ok := obj["type"].(string); ok {
return t
}
if _, ok := obj["confirm"].(string); ok {
return "confirm"
}
if _, ok := obj["options"].(string); ok {
return "option_group"
}
if _, ok := obj["text"].(string); ok {
if _, ok := obj["value"].(string); ok {
return "option"
}
}
return ""
}
func unmarshalBlockObject(r json.RawMessage, object blockObject) (blockObject, error) {
err := json.Unmarshal(r, object)
if err != nil {
return nil, err
}
return object, nil
}
// TextBlockObject defines a text element object to be used with blocks
//
// More Information: https://api.slack.com/reference/messaging/composition-objects#text
type TextBlockObject struct {
Type string `json:"type"`
Text string `json:"text"`
Emoji bool `json:"emoji,omitempty"`
Verbatim bool `json:"verbatim,omitempty"`
}
// validateType enforces block objects for element and block parameters
func (s TextBlockObject) validateType() MessageObjectType {
return MessageObjectType(s.Type)
}
// validateType enforces block objects for element and block parameters
func (s TextBlockObject) MixedElementType() MixedElementType {
return MixedElementText
}
// Validate checks if TextBlockObject has valid values
func (s TextBlockObject) Validate() error {
if s.Type != "plain_text" && s.Type != "mrkdwn" {
return errors.New("type must be either of plain_text or mrkdwn")
}
// https://github.com/slack-go/slack/issues/881
if s.Type == "mrkdwn" && s.Emoji {
return errors.New("emoji cannot be true in mrkdown")
}
return nil
}
// NewTextBlockObject returns an instance of a new Text Block Object
func NewTextBlockObject(elementType, text string, emoji, verbatim bool) *TextBlockObject {
return &TextBlockObject{
Type: elementType,
Text: text,
Emoji: emoji,
Verbatim: verbatim,
}
}
// BlockType returns the type of the block
func (t TextBlockObject) BlockType() MessageBlockType {
if t.Type == "mrkdwn" {
return MarkdownType
}
return PlainTextType
}
// ConfirmationBlockObject defines a dialog that provides a confirmation step to
// any interactive element. This dialog will ask the user to confirm their action by
// offering a confirm and deny buttons.
//
// More Information: https://api.slack.com/reference/messaging/composition-objects#confirm
type ConfirmationBlockObject struct {
Title *TextBlockObject `json:"title"`
Text *TextBlockObject `json:"text"`
Confirm *TextBlockObject `json:"confirm"`
Deny *TextBlockObject `json:"deny"`
Style Style `json:"style,omitempty"`
}
// validateType enforces block objects for element and block parameters
func (s ConfirmationBlockObject) validateType() MessageObjectType {
return motConfirmation
}
// WithStyle add styling to confirmation object
func (s *ConfirmationBlockObject) WithStyle(style Style) *ConfirmationBlockObject {
s.Style = style
return s
}
// NewConfirmationBlockObject returns an instance of a new Confirmation Block Object
func NewConfirmationBlockObject(title, text, confirm, deny *TextBlockObject) *ConfirmationBlockObject {
return &ConfirmationBlockObject{
Title: title,
Text: text,
Confirm: confirm,
Deny: deny,
}
}
// OptionBlockObject represents a single selectable item in a select menu
//
// More Information: https://api.slack.com/reference/messaging/composition-objects#option
type OptionBlockObject struct {
Text *TextBlockObject `json:"text"`
Value string `json:"value"`
Description *TextBlockObject `json:"description,omitempty"`
URL string `json:"url,omitempty"`
}
// NewOptionBlockObject returns an instance of a new Option Block Element
func NewOptionBlockObject(value string, text, description *TextBlockObject) *OptionBlockObject {
return &OptionBlockObject{
Text: text,
Value: value,
Description: description,
}
}
// validateType enforces block objects for element and block parameters
func (s OptionBlockObject) validateType() MessageObjectType {
return motOption
}
// OptionGroupBlockObject Provides a way to group options in a select menu.
//
// More Information: https://api.slack.com/reference/messaging/composition-objects#option-group
type OptionGroupBlockObject struct {
Label *TextBlockObject `json:"label,omitempty"`
Options []*OptionBlockObject `json:"options"`
}
// validateType enforces block objects for element and block parameters
func (s OptionGroupBlockObject) validateType() MessageObjectType {
return motOptionGroup
}
// NewOptionGroupBlockElement returns an instance of a new option group block element
func NewOptionGroupBlockElement(label *TextBlockObject, options ...*OptionBlockObject) *OptionGroupBlockObject {
return &OptionGroupBlockObject{
Label: label,
Options: options,
}
}