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import {
Application,
Attachment,
Channel,
CHANNEL_MENTION,
Config,
Embed,
emitEvent,
EVERYONE_MENTION,
getPermission,
getRights,
Guild,
HERE_MENTION,
HTTPError,
Message,
MessageCreateEvent,
MessageCreateSchema,
MessageType,
MessageUpdateEvent,
OrmUtils,
Role,
ROLE_MENTION,
User,
USER_MENTION,
Webhook
} from "@fosscord/util";
import cheerio from "cheerio";
import fetch from "node-fetch";
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 = OrmUtils.mergeDeep(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({ where: { id: opts.application_id } });
}
if (opts.webhook_id) {
message.webhook = await Webhook.findOneOrFail({ where: { 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({ where: { 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);
}
let content = opts.content;
let mention_channel_ids = [] as string[];
let mention_role_ids = [] as string[];
let mention_user_ids = [] as string[];
let 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({ where: { 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) => OrmUtils.mergeDeep(new Channel(), { id: x }));
message.mention_roles = mention_role_ids.map((x) => OrmUtils.mergeDeep(new Role(), { id: x }));
message.mentions = mention_user_ids.map((x) => OrmUtils.mergeDeep(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) {
const matches = message.content?.match(LINK_REGEX);
if (!matches) return;
const data = { ...message };
data.embeds = data.embeds.filter((x) => x.type !== "link");
const links = matches.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() });
//TODO: check this, removed toJSON call
await Promise.all([
Message.insert(message),
emitEvent({ event: "MESSAGE_CREATE", channel_id: opts.channel_id, data: message } 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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