begin converting discord attachments and stickers

d2m/converters/message-to-event.js

@@ -2,27 +2,93 @@
 
 const markdown = require("discord-markdown")
 
+const passthrough = require("../../passthrough")
+const { sync, db } = passthrough
+/** @type {import("../../matrix/file")} */
+const file = sync.require("../../matrix/file")
+
 /**
  * @param {import("discord-api-types/v10").APIMessage} message
- * @returns {import("../../types").Event.M_Room_Message}
  */
-function messageToEvent(message) {
+async function messageToEvent(message) {
+	const events = []
+
+	// Text content appears first
 	const body = message.content
 	const html = markdown.toHTML(body, {
-		/* discordCallback: {
-			user: Function,
-			channel: Function,
-			role: Function,
-			everyone: Function,
-			here: Function
-		} */
+		discordCallback: {
+			user: node => {
+				const mxid = db.prepare("SELECT mxid FROM sim WHERE discord_id = ?").pluck().get(node.id)
+				if (mxid) {
+					return "https://matrix.to/#/" + mxid
+				} else {
+					return "@" + node.id
+				}
+			},
+			channel: node => {
+				const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").pluck().get(node.id)
+				if (roomID) {
+					return "https://matrix.to/#/" + roomID
+				} else {
+					return "#" + node.id
+				}
+			},
+			role: node =>
+				"@&" + node.id,
+			everyone: node =>
+				"@room",
+			here: node =>
+				"@here"
+		}
 	}, null, null)
-	return {
-		msgtype: "m.text",
-		body: body,
-		format: "org.matrix.custom.html",
-		formatted_body: html
+	const isPlaintext = body === html
+	if (isPlaintext) {
+		events.push({
+			$type: "m.room.message",
+			msgtype: "m.text",
+			body: body
+		})
+	} else {
+		events.push({
+			$type: "m.room.message",
+			msgtype: "m.text",
+			body: body,
+			format: "org.matrix.custom.html",
+			formatted_body: html
+		})
 	}
+
+	// Then attachments
+	const attachmentEvents = await Promise.all(message.attachments.map(async attachment => {
+		// TODO: handle large files differently - link them instead of uploading
+		if (attachment.content_type?.startsWith("image/") && attachment.width && attachment.height) {
+			return {
+				$type: "m.room.message",
+				msgtype: "m.image",
+				url: await file.uploadDiscordFileToMxc(attachment.url),
+				external_url: attachment.url,
+				body: attachment.filename,
+				// TODO: filename: attachment.filename and then use body as the caption
+				info: {
+					mimetype: attachment.content_type,
+					w: attachment.width,
+					h: attachment.height,
+					size: attachment.size
+				}
+			}
+		} else {
+			return {
+				$type: "m.room.message",
+				msgtype: "m.text",
+				body: "Unsupported attachment:\n" + JSON.stringify(attachment, null, 2)
+			}
+		}
+	}))
+	events.push(...attachmentEvents)
+
+	// Then stickers
+
+	return events
 }
 
 module.exports.messageToEvent = messageToEvent