Support m->d redacting messages and reactions

m2d/actions/redact.js

@@ -0,0 +1,39 @@
+// @ts-check
+
+const assert = require("assert").strict
+const Ty = require("../../types")
+
+const passthrough = require("../../passthrough")
+const {discord, sync, db, select, from} = passthrough
+/** @type {import("../converters/utils")} */
+const utils = sync.require("../converters/utils")
+
+/**
+ * @param {Ty.Event.Outer_M_Room_Redaction} event
+ */
+async function deleteMessage(event) {
+	const row = from("event_message").join("message_channel", "message_id").select("channel_id", "message_id").and("WHERE event_id = ?").get(event.event_id)
+	if (!row) return
+	return discord.snow.channel.deleteMessage(row.channel_id, row.message_id, event.content.reason)
+}
+
+/**
+ * @param {Ty.Event.Outer_M_Room_Redaction} event
+ */
+async function removeReaction(event) {
+	const hash = utils.getEventIDHash(event.redacts)
+	const row = from("reaction").join("message_channel", "message_id").select("channel_id", "message_id", "encoded_emoji").and("WHERE hashed_event_id = ?").get(hash)
+	if (!row) return
+	return discord.snow.channel.deleteReactionSelf(row.channel_id, row.message_id, row.encoded_emoji)
+}
+
+/**
+ * Try everything that could possibly be redacted.
+ * @param {Ty.Event.Outer_M_Room_Redaction} event
+ */
+async function handle(event) {
+	await deleteMessage(event)
+	await removeReaction(event)
+}
+
+module.exports.handle = handle