m2d reactions (untested)

m2d/actions/add-reaction.js

@@ -0,0 +1,25 @@
+// @ts-check
+
+const assert = require("assert").strict
+const Ty = require("../../types")
+
+const passthrough = require("../../passthrough")
+const { discord, sync, db } = passthrough
+
+/**
+ * @param {Ty.Event.Outer<Ty.Event.M_Reaction>} event
+ */
+async function addReaction(event) {
+	const channelID = db.prepare("SELECT channel_id FROM channel_room WHERE room_id = ?").pluck().get(event.room_id)
+	if (!channelID) return // We just assume the bridge has already been created
+	const messageID = db.prepare("SELECT message_id FROM event_message WHERE event_id = ? AND part = 0").pluck().get(event.content["m.relates_to"].event_id) // 0 = primary
+	if (!messageID) return // Nothing can be done if the parent message was never bridged.
+
+	// no need to sync the matrix member to the other side. but if I did need to, this is where I'd do it
+
+	const emoji = event.content["m.relates_to"].key // TODO: handle custom text or emoji reactions
+
+	return discord.snow.channel.createReaction(channelID, messageID, emoji)
+}
+
+module.exports.addReaction = addReaction