adding basic reactions to discord messages

d2m/actions/add-reaction.js

@@ -0,0 +1,36 @@
+// @ts-check
+
+const assert = require("assert")
+
+const passthrough = require("../../passthrough")
+const { discord, sync, db } = passthrough
+/** @type {import("../../matrix/api")} */
+const api = sync.require("../../matrix/api")
+/** @type {import("./register-user")} */
+const registerUser = sync.require("./register-user")
+/** @type {import("../actions/create-room")} */
+const createRoom = sync.require("../actions/create-room")
+
+/**
+ * @param {import("discord-api-types/v10").GatewayMessageReactionAddDispatchData} data
+ */
+async function addReaction(data) {
+   const user = data.member?.user
+   assert.ok(user && user.username)
+   // TODO: should add my own sent messages to event_message so they can be reacted to?
+   const parentID = db.prepare("SELECT event_id FROM event_message WHERE message_id = ? AND part = 0").pluck().get(data.message_id) // 0 = primary
+   if (!parentID) return // TODO: how to handle reactions for unbridged messages? is there anything I can do?
+   assert.equal(typeof parentID, "string")
+	const roomID = await createRoom.ensureRoom(data.channel_id)
+	const senderMxid = await registerUser.ensureSimJoined(user, roomID)
+	const eventID = api.sendEvent(roomID, "m.reaction", {
+      "m.relates_to": {
+         rel_type: "m.annotation",
+         event_id: parentID,
+         key: data.emoji.name
+      }
+   }, senderMxid)
+	return eventID
+}
+
+module.exports.addReaction = addReaction