Selects component (#954)

* Interactions: the Buttons (#933)

* Interactions: buttons

* Doc fix

* Gofmt fix

* Fix typo

* Remaking interaction data into interface

* Godoc fix

* Gofmt fix

* Godoc fix

* InteractionData helper functions and some fixes in slash commands example

* Fix components example

* Yet another fix of components example

* Fix interaction unmarshaling

* Gofmt fix

* Godoc fix

* Gofmt fix

* Corrected naming and docs

* Rolled back API version

* Requested fixes

* Added support of components to webhook and regular messages

* Fix components unmarshaling

* Godoc fix

* Requested fixes

* Fixed unmarshaling issues

* Components example: cleanup

* Added components tracking to state

* Requested fixes

* Renaming fix

* Remove more named returns

* Minor English fixes

Co-authored-by: Carson Hoffman <c@rsonhoffman.com>

* Doc fix

* Gofmt fix

* Fix typo

* Remaking interaction data into interface

* Godoc fix

* Gofmt fix

* Godoc fix

* InteractionData helper functions and some fixes in slash commands example

* Fix components example

* Yet another fix of components example

* Fix interaction unmarshaling

* Godoc fix

* Gofmt fix

* Corrected naming and docs

* Rolled back API version

* Requested fixes

* Added support of components to webhook and regular messages

* Interactions: select menus

* Example fix

* Merge fix

* Some fixes

* Added missing documentation

* Fix components unmarshaling

* Godoc fix

* Requested fixes

* Fixed unmarshaling issues

* Components example: cleanup

* Gofmt fix

* Godoc fix

* URL field renaming fix

* Added flags to followups

* Updated components example

* Fixed typo in components example

* Merge fix

* Improve handling of invalid interaction situations

* support allowing webhook edits with files, and responding to interactions with files (#931)

* allow files in webhook message edits

* add Files to WebhookEdit struct

* move the construction of the multipart body for files into a shared function

* allow  interaction responses to have files

* go fmt

* fix err shadowing

* document MakeFilesBody

* rename MakeFilesBody -> EncodeWithFiles. fix InteractionRespond responding twice

* use resp in InteractionRespond files, add basic-command-with-files example command

* import strings and go fmt

* EncodeWithFiles -> MultiPartBodyWithJSON

* go fmt

* fix example for slash_commands

* move files to responsedata

* Merge fixes

* Fixed rebase consequences

Co-authored-by: Carson Hoffman <c@rsonhoffman.com>
Co-authored-by: plally <pierce@vulpes.dev>

components.go

@@ -11,6 +11,7 @@ type ComponentType uint
 const (
 	ActionsRowComponent ComponentType = 1
 	ButtonComponent     ComponentType = 2
+	SelectMenuComponent ComponentType = 3
 )
 
 // MessageComponent is a base interface for all message components.
@@ -82,6 +83,7 @@ func (r *ActionsRow) UnmarshalJSON(data []byte) error {
 	for i, v := range v.RawComponents {
 		r.Components[i] = v.MessageComponent
 	}
+
 	return err
 }
 
@@ -107,19 +109,19 @@ const (
 	LinkButton ButtonStyle = 5
 )
 
-// ButtonEmoji represents button emoji, if it does have one.
-type ButtonEmoji struct {
+// ComponentEmoji represents button emoji, if it does have one.
+type ComponentEmoji struct {
 	Name     string `json:"name,omitempty"`
 	ID       string `json:"id,omitempty"`
 	Animated bool   `json:"animated,omitempty"`
 }
 
 // Button represents button component.
 type Button struct {
-	Label    string      `json:"label"`
-	Style    ButtonStyle `json:"style"`
-	Disabled bool        `json:"disabled"`
-	Emoji    ButtonEmoji `json:"emoji"`
+	Label    string         `json:"label"`
+	Style    ButtonStyle    `json:"style"`
+	Disabled bool           `json:"disabled"`
+	Emoji    ComponentEmoji `json:"emoji"`
 
 	// NOTE: Only button with LinkButton style can have link. Also, URL is mutually exclusive with CustomID.
 	URL      string `json:"url,omitempty"`
@@ -144,6 +146,47 @@ func (b Button) MarshalJSON() ([]byte, error) {
 }
 
 // Type is a method to get the type of a component.
-func (b Button) Type() ComponentType {
+func (Button) Type() ComponentType {
 	return ButtonComponent
 }
+
+// SelectMenuOption represents an option for a select menu.
+type SelectMenuOption struct {
+	Label       string         `json:"label,omitempty"`
+	Value       string         `json:"value"`
+	Description string         `json:"description"`
+	Emoji       ComponentEmoji `json:"emoji"`
+	// Determines whenever option is selected by default or not.
+	Default bool `json:"default"`
+}
+
+// SelectMenu represents select menu component.
+type SelectMenu struct {
+	CustomID string `json:"custom_id,omitempty"`
+	// The text which will be shown in the menu if there's no default options or all options was deselected and component was closed.
+	Placeholder string `json:"placeholder"`
+	// This value determines the minimal amount of selected items in the menu.
+	MinValues int `json:"min_values,omitempty"`
+	// This value determines the maximal amount of selected items in the menu.
+	// If MaxValues or MinValues are greater than one then the user can select multiple items in the component.
+	MaxValues int                `json:"max_values,omitempty"`
+	Options   []SelectMenuOption `json:"options"`
+}
+
+// Type is a method to get the type of a component.
+func (SelectMenu) Type() ComponentType {
+	return SelectMenuComponent
+}
+
+// MarshalJSON is a method for marshaling SelectMenu to a JSON object.
+func (m SelectMenu) MarshalJSON() ([]byte, error) {
+	type selectMenu SelectMenu
+
+	return json.Marshal(struct {
+		selectMenu
+		Type ComponentType `json:"type"`
+	}{
+		selectMenu: selectMenu(m),
+		Type:       m.Type(),
+	})
+}