feat(examples/slash_commands): application command permissions

examples/slash_commands/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"log"
@@ -40,6 +41,12 @@ var (
 			// of the command.
 			Description: "Basic command",
 		},
+		{
+			Name:                     "permission-overview",
+			Description:              "Gated application command",
+			DefaultMemberPermissions: discordgo.PermissionManageServer,
+			DMPermission:             true,
+		},
 		{
 			Name:        "basic-command-with-files",
 			Description: "Basic command with files",
@@ -224,6 +231,82 @@ var (
 				},
 			})
 		},
+		"permission-overview": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
+			perms, err := s.ApplicationCommandPermissions(s.State.User.ID, i.GuildID, i.ApplicationCommandData().ID)
+
+			var restError *discordgo.RESTError
+			if errors.As(err, &restError) && restError.Message != nil && restError.Message.Code == discordgo.ErrCodeUnknownApplicationCommandPermissions {
+				s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+					Type: discordgo.InteractionResponseChannelMessageWithSource,
+					Data: &discordgo.InteractionResponseData{
+						Content: ":x: No permission overwrites",
+					},
+				})
+				return
+			} else if err != nil {
+				panic(err)
+			}
+
+			if err != nil {
+				panic(err)
+			}
+			format := "- %s %s\n"
+
+			channels := ""
+			users := ""
+			roles := ""
+
+			for _, o := range perms.Permissions {
+				emoji := "❌"
+				if o.Permission {
+					emoji = "☑"
+				}
+
+				switch o.Type {
+				case discordgo.ApplicationCommandPermissionUser:
+					users += fmt.Sprintf(format, emoji, "<@!"+o.ID+">")
+				case discordgo.ApplicationCommandPermissionChannel:
+					if o.ID == discordgo.GuildAllChannelsID(i.GuildID) {
+						channels += fmt.Sprintf(format, emoji, "All channels")
+					} else {
+						channels += fmt.Sprintf(format, emoji, "<#"+o.ID+">")
+					}
+				case discordgo.ApplicationCommandPermissionRole:
+					if o.ID == i.GuildID {
+						roles += fmt.Sprintf(format, emoji, "@everyone")
+					} else {
+						roles += fmt.Sprintf(format, emoji, "<@&"+o.ID+">")
+					}
+				}
+			}
+
+			s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+				Type: discordgo.InteractionResponseChannelMessageWithSource,
+				Data: &discordgo.InteractionResponseData{
+					Embeds: []*discordgo.MessageEmbed{
+						{
+							Title:       "Permissions overview",
+							Description: "Overview of permissions for this command",
+							Fields: []*discordgo.MessageEmbedField{
+								{
+									Name:  "Users",
+									Value: users,
+								},
+								{
+									Name:  "Channels",
+									Value: channels,
+								},
+								{
+									Name:  "Roles",
+									Value: roles,
+								},
+							},
+						},
+					},
+					AllowedMentions: &discordgo.MessageAllowedMentions{},
+				},
+			})
+		},
 		"subcommands": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
 			content := ""