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import {
Channel,
Embed,
emitEvent,
Guild,
Message,
MessageCreateEvent,
MessageUpdateEvent,
getPermission,
getRights,
CHANNEL_MENTION,
Snowflake,
USER_MENTION,
ROLE_MENTION,
Role,
EVERYONE_MENTION,
HERE_MENTION,
MessageType,
User,
Application,
Webhook,
Attachment,
Config,
} from "@fosscord/util";
import { HTTPError } from "lambert-server";
import fetch from "node-fetch";
import cheerio from "cheerio";
import { MessageCreateSchema } from "../../routes/channels/#channel_id/messages";
const allow_empty = false;
// TODO: check webhook, application, system author, stickers
// TODO: embed gifs/videos/images
const LINK_REGEX = /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)/g;
const DEFAULT_FETCH_OPTIONS: any = {
redirect: "follow",
follow: 1,
headers: {
"user-agent": "Mozilla/5.0 (compatible; Fosscord/1.0; +https://github.com/fosscord/fosscord)"
},
// size: 1024 * 1024 * 5, // grabbed from config later
compress: true,
method: "GET"
};
export async function handleMessage(opts: MessageOptions): Promise<Message> {
const channel = await Channel.findOneOrFail({ where: { id: opts.channel_id }, relations: ["recipients"] });
if (!channel || !opts.channel_id) throw new HTTPError("Channel not found", 404);
const message = new Message({
...opts,
sticker_items: opts.sticker_ids?.map((x) => ({ id: x })),
guild_id: channel.guild_id,
channel_id: opts.channel_id,
attachments: opts.attachments || [],
embeds: opts.embeds || [],
reactions: /*opts.reactions ||*/ [],
type: opts.type ?? 0
});
if (message.content && message.content.length > Config.get().limits.message.maxCharacters) {
throw new HTTPError("Content length over max character limit")
}
if (opts.author_id) {
message.author = await User.getPublicUser(opts.author_id);
const rights = await getRights(opts.author_id);
rights.hasThrow("SEND_MESSAGES");
}
if (opts.application_id) {
message.application = await Application.findOneOrFail({ id: opts.application_id });
}
if (opts.webhook_id) {
message.webhook = await Webhook.findOneOrFail({ id: opts.webhook_id });
}
const permission = await getPermission(opts.author_id, channel.guild_id, opts.channel_id);
permission.hasThrow("SEND_MESSAGES");
if (permission.cache.member) {
message.member = permission.cache.member;
}
if (opts.tts) permission.hasThrow("SEND_TTS_MESSAGES");
if (opts.message_reference) {
permission.hasThrow("READ_MESSAGE_HISTORY");
// code below has to be redone when we add custom message routing
if (message.guild_id !== null) {
const guild = await Guild.findOneOrFail({ id: channel.guild_id });
if (!guild.features.includes("CROSS_CHANNEL_REPLIES")) {
if (opts.message_reference.guild_id !== channel.guild_id) throw new HTTPError("You can only reference messages from this guild");
if (opts.message_reference.channel_id !== opts.channel_id) throw new HTTPError("You can only reference messages from this channel");
}
}
/** Q: should be checked if the referenced message exists? ANSWER: NO
otherwise backfilling won't work **/
// @ts-ignore
message.type = MessageType.REPLY;
}
// TODO: stickers/activity
if (!allow_empty && (!opts.content && !opts.embeds?.length && !opts.attachments?.length && !opts.sticker_ids?.length)) {
throw new HTTPError("Empty messages are not allowed", 50006);
}
var content = opts.content;
var mention_channel_ids = [] as string[];
var mention_role_ids = [] as string[];
var mention_user_ids = [] as string[];
var mention_everyone = false;
if (content) { // TODO: explicit-only mentions
message.content = content.trim();
for (const [_, mention] of content.matchAll(CHANNEL_MENTION)) {
if (!mention_channel_ids.includes(mention)) mention_channel_ids.push(mention);
}
for (const [_, mention] of content.matchAll(USER_MENTION)) {
if (!mention_user_ids.includes(mention)) mention_user_ids.push(mention);
}
await Promise.all(
Array.from(content.matchAll(ROLE_MENTION)).map(async ([_, mention]) => {
const role = await Role.findOneOrFail({ id: mention, guild_id: channel.guild_id });
if (role.mentionable || permission.has("MANAGE_ROLES")) {
mention_role_ids.push(mention);
}
})
);
if (permission.has("MENTION_EVERYONE")) {
mention_everyone = !!content.match(EVERYONE_MENTION) || !!content.match(HERE_MENTION);
}
}
message.mention_channels = mention_channel_ids.map((x) => new Channel({ id: x }));
message.mention_roles = mention_role_ids.map((x) => new Role({ id: x }));
message.mentions = mention_user_ids.map((x) => new User({ id: x }));
message.mention_everyone = mention_everyone;
// TODO: check and put it all in the body
return message;
}
// TODO: cache link result in db
export async function postHandleMessage(message: Message) {
var links = message.content?.match(LINK_REGEX);
if (!links) return;
const data = { ...message };
data.embeds = data.embeds.filter((x) => x.type !== "link");
links = links.slice(0, 20); // embed max 20 links — TODO: make this configurable with instance policies
for (const link of links) {
try {
const request = await fetch(link, {
...DEFAULT_FETCH_OPTIONS,
size: Config.get().limits.message.maxEmbedDownloadSize,
});
const text = await request.text();
const $ = cheerio.load(text);
const title = $('meta[property="og:title"]').attr("content");
const provider_name = $('meta[property="og:site_name"]').text();
const author_name = $('meta[property="article:author"]').attr("content");
const description = $('meta[property="og:description"]').attr("content") || $('meta[property="description"]').attr("content");
const image = $('meta[property="og:image"]').attr("content");
const url = $('meta[property="og:url"]').attr("content");
// TODO: color
const embed: Embed = {
provider: {
url: link,
name: provider_name
}
};
if (author_name) embed.author = { name: author_name };
if (image) embed.thumbnail = { proxy_url: image, url: image };
if (title) embed.title = title;
if (url) embed.url = url;
if (description) embed.description = description;
if (title || description) {
data.embeds.push(embed);
}
} catch (error) {}
}
await Promise.all([
emitEvent({
event: "MESSAGE_UPDATE",
channel_id: message.channel_id,
data
} as MessageUpdateEvent),
Message.update({ id: message.id, channel_id: message.channel_id }, { embeds: data.embeds })
]);
}
export async function sendMessage(opts: MessageOptions) {
const message = await handleMessage({ ...opts, timestamp: new Date() });
await Promise.all([
Message.insert(message),
emitEvent({ event: "MESSAGE_CREATE", channel_id: opts.channel_id, data: message.toJSON() } as MessageCreateEvent)
]);
postHandleMessage(message).catch((e) => {}); // no await as it should catch error non-blockingly
return message;
}
interface MessageOptions extends MessageCreateSchema {
id?: string;
type?: MessageType;
pinned?: boolean;
author_id?: string;
webhook_id?: string;
application_id?: string;
embeds?: Embed[];
channel_id?: string;
attachments?: Attachment[];
edited_timestamp?: Date;
timestamp?: Date;
}
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