out-of-your-element/discord/interactions/invite.js

// @ts-check

const DiscordTypes = require("discord-api-types/v10")
const assert = require("assert/strict")
const {discord, sync, db, select, from} = require("../../passthrough")

/** @type {import("../../matrix/api")} */
const api = sync.require("../../matrix/api")

/** @param {DiscordTypes.APIChatInputApplicationCommandGuildInteraction} interaction */
async function interact({id, token, data, channel, member, guild_id}) {
	// Check guild is bridged
	const spaceID = select("guild_space", "space_id", {guild_id}).pluck().get()
	const roomID = select("channel_room", "room_id", {channel_id: channel.id}).pluck().get()
	if (!spaceID || !roomID) return discord.snow.interaction.createInteractionResponse(id, token, {
		type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
		data: {
			content: "This server isn't bridged to Matrix, so you can't invite Matrix users.",
			flags: DiscordTypes.MessageFlags.Ephemeral
		}
	})

	// Get named MXID
	/** @type {DiscordTypes.APIApplicationCommandInteractionDataStringOption[] | undefined} */ // @ts-ignore
	const options = data.options
	const input = options?.[0].value || ""
	const mxid = input.match(/@([^:]+):([a-z0-9:-]+\.[a-z0-9.:-]+)/)?.[0]
	if (!mxid) return discord.snow.interaction.createInteractionResponse(id, token, {
		type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
		data: {
			content: "You have to say the Matrix ID of the person you want to invite. Matrix IDs look like this: `@username:example.org`",
			flags: DiscordTypes.MessageFlags.Ephemeral
		}
	})

	// Check for existing invite to the space
	let spaceMember
	try {
		spaceMember = await api.getStateEvent(spaceID, "m.room.member", mxid)
	} catch (e) {}
	if (spaceMember && spaceMember.membership === "invite") {
		return discord.snow.interaction.createInteractionResponse(id, token, {
			type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
			data: {
				content: `\`${mxid}\` already has an invite, which they haven't accepted yet.`,
				flags: DiscordTypes.MessageFlags.Ephemeral
			}
		})
	}

	// Invite Matrix user if not in space
	if (!spaceMember || spaceMember.membership !== "join") {
		await api.inviteToRoom(spaceID, mxid)
		return discord.snow.interaction.createInteractionResponse(id, token, {
			type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
			data: {
				content: `You invited \`${mxid}\` to the server.`
			}
		})
	}

	// The Matrix user *is* in the space, maybe we want to invite them to this channel?
	let roomMember
	try {
		roomMember = await api.getStateEvent(roomID, "m.room.member", mxid)
	} catch (e) {}
	if (!roomMember || (roomMember.membership !== "join" && roomMember.membership !== "invite")) {
		return discord.snow.interaction.createInteractionResponse(id, token, {
			type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
			data: {
				content: `\`${mxid}\` is already in this server. Would you like to additionally invite them to this specific channel?`,
				flags: DiscordTypes.MessageFlags.Ephemeral,
				components: [{
					type: DiscordTypes.ComponentType.ActionRow,
					components: [{
						type: DiscordTypes.ComponentType.Button,
						custom_id: "invite_channel",
						style: DiscordTypes.ButtonStyle.Primary,
						label: "Sure",
					}]
				}]
			}
		})
	}

	// The Matrix user *is* in the space and in the channel.
	return discord.snow.interaction.createInteractionResponse(id, token, {
		type: DiscordTypes.InteractionResponseType.ChannelMessageWithSource,
		data: {
			content: `\`${mxid}\` is already in this server and this channel.`,
			flags: DiscordTypes.MessageFlags.Ephemeral
		}
	})
}

/** @param {DiscordTypes.APIMessageComponentGuildInteraction} interaction */
async function interactButton({id, token, data, channel, member, guild_id, message}) {
	const mxid = message.content.match(/`(@(?:[^:]+):(?:[a-z0-9:-]+\.[a-z0-9.:-]+))`/)?.[1]
	assert(mxid)
	const roomID = select("channel_room", "room_id", {channel_id: channel.id}).pluck().get()
	await api.inviteToRoom(roomID, mxid)
	return discord.snow.interaction.createInteractionResponse(id, token, {
		type: DiscordTypes.InteractionResponseType.UpdateMessage,
		data: {
			content: `You invited \`${mxid}\` to the channel.`,
			flags: DiscordTypes.MessageFlags.Ephemeral,
			components: []
		}
	})
}

module.exports.interact = interact
module.exports.interactButton = interactButton