518 lines
20 KiB
JavaScript
518 lines
20 KiB
JavaScript
// @ts-check
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const Ty = require("../../types")
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const DiscordTypes = require("discord-api-types/v10")
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const chunk = require("chunk-text")
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const TurndownService = require("turndown")
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const assert = require("assert").strict
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const passthrough = require("../../passthrough")
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const {sync, db, discord, select, from} = passthrough
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/** @type {import("../../matrix/file")} */
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const file = sync.require("../../matrix/file")
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/** @type {import("../converters/utils")} */
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const utils = sync.require("../converters/utils")
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/** @type {import("./emoji-sheet")} */
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const emojiSheet = sync.require("./emoji-sheet")
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/** @type {[RegExp, string][]} */
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const markdownEscapes = [
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[/\\/g, '\\\\'],
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[/\*/g, '\\*'],
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[/^-/g, '\\-'],
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[/^\+ /g, '\\+ '],
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[/^(=+)/g, '\\$1'],
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[/^(#{1,6}) /g, '\\$1 '],
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[/`/g, '\\`'],
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[/^~~~/g, '\\~~~'],
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[/\[/g, '\\['],
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[/\]/g, '\\]'],
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[/^>/g, '\\>'],
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[/_/g, '\\_'],
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[/^(\d+)\. /g, '$1\\. ']
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]
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const turndownService = new TurndownService({
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hr: "----",
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headingStyle: "atx",
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preformattedCode: true,
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codeBlockStyle: "fenced",
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})
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/**
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* Markdown characters in the HTML content need to be escaped, though take care not to escape the middle of bare links
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* @param {string} string
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*/
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// @ts-ignore bad type from turndown
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turndownService.escape = function (string) {
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const escapedWords = string.split(" ").map(word => {
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if (word.match(/^https?:\/\//)) {
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return word
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} else {
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return markdownEscapes.reduce(function (accumulator, escape) {
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return accumulator.replace(escape[0], escape[1])
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}, word)
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}
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})
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return escapedWords.join(" ")
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}
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turndownService.remove("mx-reply")
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turndownService.addRule("strikethrough", {
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filter: ["del", "s"],
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replacement: function (content) {
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return "~~" + content + "~~"
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}
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})
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turndownService.addRule("underline", {
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filter: ["u"],
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replacement: function (content) {
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return "__" + content + "__"
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}
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})
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turndownService.addRule("blockquote", {
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filter: "blockquote",
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replacement: function (content) {
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content = content.replace(/^\n+|\n+$/g, "")
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content = content.replace(/^/gm, "> ")
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return content
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}
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})
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turndownService.addRule("spoiler", {
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filter: function (node, options) {
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return node.hasAttribute("data-mx-spoiler")
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},
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replacement: function (content, node) {
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return "||" + content + "||"
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}
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})
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turndownService.addRule("inlineLink", {
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filter: function (node, options) {
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return (
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node.nodeName === "A" &&
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node.getAttribute("href")
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)
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},
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replacement: function (content, node) {
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if (node.getAttribute("data-user-id")) return `<@${node.getAttribute("data-user-id")}>`
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if (node.getAttribute("data-channel-id")) return `<#${node.getAttribute("data-channel-id")}>`
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const href = node.getAttribute("href")
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let brackets = ["", ""]
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if (href.startsWith("https://matrix.to")) brackets = ["<", ">"]
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return "[" + content + "](" + brackets[0] + href + brackets[1] + ")"
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}
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})
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/** @type {string[]} SPRITE SHEET EMOJIS FEATURE: mxc urls for the currently processing message */
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let endOfMessageEmojis = []
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turndownService.addRule("emoji", {
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filter: function (node, options) {
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if (node.nodeName !== "IMG" || !node.hasAttribute("data-mx-emoticon") || !node.getAttribute("src") || !node.getAttribute("title")) return false
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return true
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},
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replacement: function (content, node) {
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const mxcUrl = node.getAttribute("src")
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let row = select("emoji", ["id", "name", "animated"], "WHERE mxc_url = ?").get(mxcUrl)
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if (!row) {
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// We don't know what this is... but maybe we can guess based on the name?
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const guessedName = node.getAttribute("title").replace(/^:|:$/g, "")
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for (const guild of discord?.guilds.values() || []) {
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/** @type {{name: string, id: string, animated: number}[]} */
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// @ts-ignore
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const emojis = guild.emojis
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const match = emojis.find(e => e.name === guessedName) || emojis.find(e => e.name?.toLowerCase() === guessedName.toLowerCase())
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if (match) {
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row = match
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break
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}
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}
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}
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if (row) {
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const animatedChar = row.animated ? "a" : ""
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return `<${animatedChar}:${row.name}:${row.id}>`
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} else {
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if (endOfMessageEmojis.includes(mxcUrl)) {
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// After control returns to the main converter, it will rewind over this, delete this section, and upload the emojis as a sprite sheet.
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return `<::>`
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} else {
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// This emoji is not at the end of the message, it is in the middle. We don't upload middle emojis as a sprite sheet.
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return `[${node.getAttribute("title")}](${utils.getPublicUrlForMxc(mxcUrl)})`
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}
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}
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}
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})
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turndownService.addRule("fencedCodeBlock", {
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filter: function (node, options) {
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return (
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options.codeBlockStyle === "fenced" &&
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node.nodeName === "PRE" &&
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node.firstChild &&
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node.firstChild.nodeName === "CODE"
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)
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},
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replacement: function (content, node, options) {
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const className = node.firstChild.getAttribute("class") || ""
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const language = (className.match(/language-(\S+)/) || [null, ""])[1]
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const code = node.firstChild
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const visibleCode = code.childNodes.map(c => c.nodeName === "BR" ? "\n" : c.textContent).join("").replace(/\n*$/g, "")
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var fence = "```"
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return (
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fence + language + "\n" +
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visibleCode +
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"\n" + fence
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)
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}
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})
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/**
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* @param {string} roomID
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* @param {string} mxid
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* @returns {Promise<{displayname?: string?, avatar_url?: string?}>}
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*/
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async function getMemberFromCacheOrHomeserver(roomID, mxid, api) {
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const row = select("member_cache", ["displayname", "avatar_url"], "WHERE room_id = ? AND mxid = ?").get(roomID, mxid)
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if (row) return row
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return api.getStateEvent(roomID, "m.room.member", mxid).then(event => {
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db.prepare("REPLACE INTO member_cache (room_id, mxid, displayname, avatar_url) VALUES (?, ?, ?, ?)").run(roomID, mxid, event?.displayname || null, event?.avatar_url || null)
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return event
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}).catch(() => {
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return {displayname: null, avatar_url: null}
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})
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}
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/**
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* Splits a display name into one chunk containing <=80 characters, and another chunk containing the rest of the characters. Splits on
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* whitespace if possible.
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* These chunks, respectively, go in the display name, and at the top of the message.
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* If the second part isn't empty, it'll also contain boldening markdown and a line break at the end, so that regardless of its value it
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* can be prepended to the message content as-is.
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* @summary Splits too-long Matrix names into a display name chunk and a message content chunk.
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* @param {string} displayName - The Matrix side display name to chop up.
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* @returns {[string, string]} [shortened display name, display name runoff]
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*/
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function splitDisplayName(displayName) {
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/** @type {string[]} */
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let displayNameChunks = chunk(displayName, 80)
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if (displayNameChunks.length === 1) {
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return [displayName, ""]
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} else {
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const displayNamePreRunoff = displayNameChunks[0]
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// displayNameRunoff is a slice of the original rather than a concatenation of the rest of the chunks in order to preserve whatever whitespace it was broken on.
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const displayNameRunoff = `**${displayName.slice(displayNamePreRunoff.length + 1)}**\n`
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return [displayNamePreRunoff, displayNameRunoff]
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}
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}
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/**
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* At the time of this executing, we know what the end of message emojis are, and we know that at least one of them is unknown.
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* This function will strip them from the content and generate the correct pending file of the sprite sheet.
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* @param {string} content
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* @param {{id: string, name: string}[]} attachments
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* @param {({name: string, url: string} | {name: string, url: string, key: string, iv: string} | {name: string, buffer: Buffer})[]} pendingFiles
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*/
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async function uploadEndOfMessageSpriteSheet(content, attachments, pendingFiles) {
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if (!content.includes("<::>")) return content // No unknown emojis, nothing to do
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// Remove known and unknown emojis from the end of the message
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const r = /<a?:[a-zA-Z0-9_]*:[0-9]*>\s*$/
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while (content.match(r)) {
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content = content.replace(r, "")
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}
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// Create a sprite sheet of known and unknown emojis from the end of the message
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const buffer = await emojiSheet.compositeMatrixEmojis(endOfMessageEmojis)
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// Attach it
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const name = "emojis.png"
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attachments.push({id: "0", name})
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pendingFiles.push({name, buffer})
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return content
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}
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/**
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* @param {Ty.Event.Outer_M_Room_Message | Ty.Event.Outer_M_Room_Message_File | Ty.Event.Outer_M_Sticker | Ty.Event.Outer_M_Room_Message_Encrypted_File} event
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* @param {import("discord-api-types/v10").APIGuild} guild
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* @param {{api: import("../../matrix/api")}} di simple-as-nails dependency injection for the matrix API
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*/
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async function eventToMessage(event, guild, di) {
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/** @type {(DiscordTypes.RESTPostAPIWebhookWithTokenJSONBody & {files?: {name: string, file: Buffer}[]})[]} */
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let messages = []
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let displayName = event.sender
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let avatarURL = undefined
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/** @type {string[]} */
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let messageIDsToEdit = []
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let replyLine = ""
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// Extract a basic display name from the sender
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const match = event.sender.match(/^@(.*?):/)
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if (match) displayName = match[1]
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// Try to extract an accurate display name and avatar URL from the member event
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const member = await getMemberFromCacheOrHomeserver(event.room_id, event.sender, di?.api)
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if (member.displayname) displayName = member.displayname
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if (member.avatar_url) avatarURL = utils.getPublicUrlForMxc(member.avatar_url) || undefined
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// If the display name is too long to be put into the webhook (80 characters is the maximum),
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// put the excess characters into displayNameRunoff, later to be put at the top of the message
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let [displayNameShortened, displayNameRunoff] = splitDisplayName(displayName)
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// If the message type is m.emote, the full name is already included at the start of the message, so remove any runoff
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if (event.type === "m.room.message" && event.content.msgtype === "m.emote") {
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displayNameRunoff = ""
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}
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let content = event.content.body // ultimate fallback
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const attachments = []
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/** @type {({name: string, url: string} | {name: string, url: string, key: string, iv: string} | {name: string, buffer: Buffer})[]} */
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const pendingFiles = []
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// Convert content depending on what the message is
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if (event.type === "m.room.message" && (event.content.msgtype === "m.text" || event.content.msgtype === "m.emote")) {
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// Handling edits. If the edit was an edit of a reply, edits do not include the reply reference, so we need to fetch up to 2 more events.
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// this event ---is an edit of--> original event ---is a reply to--> past event
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await (async () => {
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if (!event.content["m.new_content"]) return
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const relatesTo = event.content["m.relates_to"]
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if (!relatesTo) return
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// Check if we have a pointer to what was edited
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const relType = relatesTo.rel_type
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if (relType !== "m.replace") return
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const originalEventId = relatesTo.event_id
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if (!originalEventId) return
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messageIDsToEdit = select("event_message", "message_id", "WHERE event_id = ? ORDER BY part").pluck().all(originalEventId)
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if (!messageIDsToEdit.length) return
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// Ok, it's an edit.
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event.content = event.content["m.new_content"]
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// Is it editing a reply? We need special handling if it is.
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// Get the original event, then check if it was a reply
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const originalEvent = await di.api.getEvent(event.room_id, originalEventId)
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if (!originalEvent) return
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const repliedToEventId = originalEvent.content["m.relates_to"]?.["m.in_reply_to"]?.event_id
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if (!repliedToEventId) return
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// After all that, it's an edit of a reply.
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// We'll be sneaky and prepare the message data so that the next steps can handle it just like original messages.
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Object.assign(event.content, {
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"m.relates_to": {
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"m.in_reply_to": {
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event_id: repliedToEventId
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}
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}
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})
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})()
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// Handling replies. We'll look up the data of the replied-to event from the Matrix homeserver.
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// Note that an <mx-reply> element is not guaranteed because this might be m.new_content.
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await (async () => {
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const repliedToEventId = event.content["m.relates_to"]?.["m.in_reply_to"]?.event_id
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if (!repliedToEventId) return
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let repliedToEvent = await di.api.getEvent(event.room_id, repliedToEventId)
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if (!repliedToEvent) return
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const row = from("event_message").join("message_channel", "message_id").select("channel_id", "message_id").and("WHERE event_id = ? ORDER BY part").get(repliedToEventId)
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if (row) {
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replyLine = `<:L1:1144820033948762203><:L2:1144820084079087647>https://discord.com/channels/${guild.id}/${row.channel_id}/${row.message_id} `
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} else {
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replyLine = `<:L1:1144820033948762203><:L2:1144820084079087647>`
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}
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const sender = repliedToEvent.sender
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const senderName = sender.match(/@([^:]*)/)?.[1] || sender
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const authorID = select("sim", "discord_id", "WHERE mxid = ?").pluck().get(repliedToEvent.sender)
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if (authorID) {
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replyLine += `<@${authorID}>`
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} else {
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replyLine += `Ⓜ️**${senderName}**`
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}
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// If the event has been edited, the homeserver will include the relation in `unsigned`.
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if (repliedToEvent.unsigned?.["m.relations"]?.["m.replace"]?.content?.["m.new_content"]) {
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repliedToEvent = repliedToEvent.unsigned["m.relations"]["m.replace"] // Note: this changes which event_id is in repliedToEvent.
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repliedToEvent.content = repliedToEvent.content["m.new_content"]
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}
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let contentPreview
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const fileReplyContentAlternative =
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( repliedToEvent.content.msgtype === "m.image" ? "🖼️"
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: repliedToEvent.content.msgtype === "m.video" ? "🎞️"
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: repliedToEvent.content.msgtype === "m.audio" ? "🎶"
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: repliedToEvent.content.msgtype === "m.file" ? "📄"
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: null)
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if (fileReplyContentAlternative) {
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contentPreview = " " + fileReplyContentAlternative
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} else {
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const repliedToContent = repliedToEvent.content.formatted_body || repliedToEvent.content.body
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const contentPreviewChunks = chunk(
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repliedToContent.replace(/.*<\/mx-reply>/, "") // Remove everything before replies, so just use the actual message body
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.replace(/.*?<\/blockquote>/, "") // If the message starts with a blockquote, don't count it and use the message body afterwards
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.replace(/(?:\n|<br>)+/g, " ") // Should all be on one line
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.replace(/<span [^>]*data-mx-spoiler\b[^>]*>.*?<\/span>/g, "[spoiler]") // Good enough method of removing spoiler content. (I don't want to break out the HTML parser unless I have to.)
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.replace(/<[^>]+>/g, ""), 50) // Completely strip all other formatting.
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contentPreview = ":\n> "
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contentPreview += contentPreviewChunks.length > 1 ? contentPreviewChunks[0] + "..." : contentPreviewChunks[0]
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}
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replyLine = `> ${replyLine}${contentPreview}\n`
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})()
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if (event.content.format === "org.matrix.custom.html" && event.content.formatted_body) {
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let input = event.content.formatted_body
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if (event.content.msgtype === "m.emote") {
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input = `* ${displayName} ${input}`
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}
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// Handling mentions of Discord users
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input = input.replace(/("https:\/\/matrix.to\/#\/(@[^"]+)")>/g, (whole, attributeValue, mxid) => {
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if (!utils.eventSenderIsFromDiscord(mxid)) return whole
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const userID = select("sim", "discord_id", "WHERE mxid = ?").pluck().get(mxid)
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if (!userID) return whole
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return `${attributeValue} data-user-id="${userID}">`
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})
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// Handling mentions of Discord rooms
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input = input.replace(/("https:\/\/matrix.to\/#\/(![^"]+)")>/g, (whole, attributeValue, roomID) => {
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const channelID = select("channel_room", "channel_id", "WHERE room_id = ?").pluck().get(roomID)
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if (!channelID) return whole
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return `${attributeValue} data-channel-id="${channelID}">`
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})
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// Element adds a bunch of <br> before </blockquote> but doesn't render them. I can't figure out how this even works in the browser, so let's just delete those.
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input = input.replace(/(?:\n|<br ?\/?>\s*)*<\/blockquote>/g, "</blockquote>")
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// The matrix spec hasn't decided whether \n counts as a newline or not, but I'm going to count it, because if it's in the data it's there for a reason.
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// But I should not count it if it's between block elements.
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input = input.replace(/(<\/?([^ >]+)[^>]*>)?\n(<\/?([^ >]+)[^>]*>)?/g, (whole, beforeContext, beforeTag, afterContext, afterTag) => {
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// console.error(beforeContext, beforeTag, afterContext, afterTag)
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if (typeof beforeTag !== "string" && typeof afterTag !== "string") {
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return "<br>"
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}
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beforeContext = beforeContext || ""
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beforeTag = beforeTag || ""
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afterContext = afterContext || ""
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afterTag = afterTag || ""
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if (!utils.BLOCK_ELEMENTS.includes(beforeTag.toUpperCase()) && !utils.BLOCK_ELEMENTS.includes(afterTag.toUpperCase())) {
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return beforeContext + "<br>" + afterContext
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} else {
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return whole
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}
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})
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// Note: Element's renderers on Web and Android currently collapse whitespace, like the browser does. Turndown also collapses whitespace which is good for me.
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// If later I'm using a client that doesn't collapse whitespace and I want turndown to follow suit, uncomment the following line of code, and it Just Works:
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// input = input.replace(/ /g, " ")
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// There is also a corresponding test to uncomment, named "event2message: whitespace is retained"
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// SPRITE SHEET EMOJIS FEATURE: Emojis at the end of the message that we don't know about will be reuploaded as a sprite sheet.
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// First we need to determine which emojis are at the end.
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endOfMessageEmojis = []
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let match
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let last = input.length
|
|
while ((match = input.slice(0, last).match(/<img [^>]*>\s*$/))) {
|
|
if (!match[0].includes("data-mx-emoticon")) break
|
|
const mxcUrl = match[0].match(/\bsrc="(mxc:\/\/[^"]+)"/)
|
|
if (mxcUrl) endOfMessageEmojis.unshift(mxcUrl[1])
|
|
if (typeof match.index !== "number") break
|
|
last = match.index
|
|
}
|
|
|
|
// @ts-ignore bad type from turndown
|
|
content = turndownService.turndown(input)
|
|
|
|
// It's designed for commonmark, we need to replace the space-space-newline with just newline
|
|
content = content.replace(/ \n/g, "\n")
|
|
|
|
// SPRITE SHEET EMOJIS FEATURE:
|
|
content = await uploadEndOfMessageSpriteSheet(content, attachments, pendingFiles)
|
|
} else {
|
|
// Looks like we're using the plaintext body!
|
|
content = event.content.body
|
|
|
|
if (event.content.msgtype === "m.emote") {
|
|
content = `* ${displayName} ${content}`
|
|
}
|
|
|
|
// Markdown needs to be escaped, though take care not to escape the middle of links
|
|
// @ts-ignore bad type from turndown
|
|
content = turndownService.escape(content)
|
|
}
|
|
} else if (event.type === "m.room.message" && (event.content.msgtype === "m.file" || event.content.msgtype === "m.video" || event.content.msgtype === "m.audio" || event.content.msgtype === "m.image")) {
|
|
content = ""
|
|
const filename = event.content.body
|
|
if ("url" in event.content) {
|
|
// Unencrypted
|
|
const url = utils.getPublicUrlForMxc(event.content.url)
|
|
assert(url)
|
|
attachments.push({id: "0", filename})
|
|
pendingFiles.push({name: filename, url})
|
|
} else {
|
|
// Encrypted
|
|
const url = utils.getPublicUrlForMxc(event.content.file.url)
|
|
assert(url)
|
|
assert.equal(event.content.file.key.alg, "A256CTR")
|
|
attachments.push({id: "0", filename})
|
|
pendingFiles.push({name: filename, url, key: event.content.file.key.k, iv: event.content.file.iv})
|
|
}
|
|
} else if (event.type === "m.sticker") {
|
|
content = ""
|
|
let filename = event.content.body
|
|
if (event.type === "m.sticker" && event.content.info.mimetype.includes("/")) {
|
|
filename += "." + event.content.info.mimetype.split("/")[1]
|
|
}
|
|
const url = utils.getPublicUrlForMxc(event.content.url)
|
|
assert(url)
|
|
attachments.push({id: "0", filename})
|
|
pendingFiles.push({name: filename, url})
|
|
}
|
|
|
|
content = displayNameRunoff + replyLine + content
|
|
|
|
// Split into 2000 character chunks
|
|
const chunks = chunk(content, 2000)
|
|
messages = messages.concat(chunks.map(content => ({
|
|
content,
|
|
username: displayNameShortened,
|
|
avatar_url: avatarURL
|
|
})))
|
|
|
|
if (attachments.length) {
|
|
// If content is empty (should be the case when uploading a file) then chunk-text will create 0 messages.
|
|
// There needs to be a message to add attachments to.
|
|
if (!messages.length) messages.push({
|
|
content,
|
|
username: displayNameShortened,
|
|
avatar_url: avatarURL
|
|
})
|
|
messages[0].attachments = attachments
|
|
// @ts-ignore these will be converted to real files when the message is about to be sent
|
|
messages[0].pendingFiles = pendingFiles
|
|
}
|
|
|
|
const messagesToEdit = []
|
|
const messagesToSend = []
|
|
for (let i = 0; i < messages.length; i++) {
|
|
const next = messageIDsToEdit[0]
|
|
if (next) {
|
|
messagesToEdit.push({id: next, message: messages[i]})
|
|
messageIDsToEdit.shift()
|
|
} else {
|
|
messagesToSend.push(messages[i])
|
|
}
|
|
}
|
|
|
|
// Ensure there is code coverage for adding, editing, and deleting
|
|
if (messagesToSend.length) void 0
|
|
if (messagesToEdit.length) void 0
|
|
if (messageIDsToEdit.length) void 0
|
|
|
|
return {
|
|
messagesToEdit,
|
|
messagesToSend,
|
|
messagesToDelete: messageIDsToEdit
|
|
}
|
|
}
|
|
|
|
module.exports.eventToMessage = eventToMessage
|