97 lines
4.0 KiB
JavaScript
97 lines
4.0 KiB
JavaScript
// @ts-check
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const assert = require("assert")
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const passthrough = require("../../passthrough")
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const { discord, sync, db } = passthrough
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/** @type {import("./message-to-event")} */
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const messageToEvent = sync.require("../converters/message-to-event")
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/** @type {import("../../matrix/api")} */
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const api = sync.require("../../matrix/api")
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/** @type {import("../actions/register-user")} */
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const registerUser = sync.require("./register-user")
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/** @type {import("../actions/create-room")} */
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const createRoom = sync.require("../actions/create-room")
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/**
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* @param {import("discord-api-types/v10").GatewayMessageCreateDispatchData} message
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* IMPORTANT: This may not have all the normal fields! The API documentation doesn't provide possible types, just says it's all optional!
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* Since I don't have a spec, I will have to capture some real traffic and add it as test cases... I hope they don't change anything later...
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* @param {import("discord-api-types/v10").APIGuild} guild
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*/
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async function editToChanges(message, guild) {
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// Figure out what events we will be replacing
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const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").get(message.channel_id)
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const senderMxid = await registerUser.ensureSimJoined(message.author, roomID)
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/** @type {{event_id: string, event_type: string, event_subtype: string?, part: number}[]} */
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const oldEventRows = db.prepare("SELECT event_id, event_type, event_subtype, part FROM event_message WHERE message_id = ?").all(message.id)
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// Figure out what we will be replacing them with
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const newEvents = await messageToEvent.messageToEvent(message, guild, api)
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// Match the new events to the old events
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/*
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Rules:
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+ The events must have the same type.
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+ The events must have the same subtype.
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Events will therefore be divided into three categories:
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*/
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/** 1. Events that are matched, and should be edited by sending another m.replace event */
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let eventsToReplace = []
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/** 2. Events that are present in the old version only, and should be blanked or redacted */
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let eventsToRedact = []
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/** 3. Events that are present in the new version only, and should be sent as new, with references back to the context */
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let eventsToSend = []
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// For each old event...
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outer: while (newEvents.length) {
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const newe = newEvents[0]
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// Find a new event to pair it with...
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let handled = false
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for (let i = 0; i < oldEventRows.length; i++) {
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const olde = oldEventRows[i]
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if (olde.event_type === newe.$type && olde.event_subtype === (newe.msgtype || null)) {
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// Found one!
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// Set up the pairing
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eventsToReplace.push({
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old: olde,
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new: newe
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})
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// These events have been handled now, so remove them from the source arrays
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newEvents.shift()
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oldEventRows.splice(i, 1)
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// Go all the way back to the start of the next iteration of the outer loop
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continue outer
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}
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}
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// If we got this far, we could not pair it to an existing event, so it'll have to be a new one
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eventsToSend.push(newe)
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newEvents.shift()
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}
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// Anything remaining in oldEventRows is present in the old version only and should be redacted.
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eventsToRedact = oldEventRows
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// Now, everything in eventsToSend and eventsToRedact is a real change, but everything in eventsToReplace might not have actually changed!
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// (Consider a MESSAGE_UPDATE for a text+image message - Discord does not allow the image to be changed, but the text might have been.)
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// So we'll remove entries from eventsToReplace that *definitely* cannot have changed. Everything remaining *may* have changed.
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eventsToReplace = eventsToReplace.filter(ev => {
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// Discord does not allow files, images, attachments, or videos to be edited.
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if (ev.old.event_type === "m.room.message" && ev.old.event_subtype !== "m.text" && ev.old.event_subtype !== "m.emote") {
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return false
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}
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// Discord does not allow stickers to be edited.
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if (ev.old.event_type === "m.sticker") {
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return false
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}
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// Anything else is fair game.
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return true
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})
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return {eventsToReplace, eventsToRedact, eventsToSend}
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}
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module.exports.editMessage = editMessage
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