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import {
Channel,
Embed,
emitEvent,
Message,
MessageCreateEvent,
MessageUpdateEvent,
getPermission,
CHANNEL_MENTION,
Snowflake,
PublicMemberProjection,
USER_MENTION,
ROLE_MENTION,
Role,
EVERYONE_MENTION,
HERE_MENTION
} from "@fosscord/util";
import { HTTPError } from "lambert-server";
import fetch from "node-fetch";
import cheerio from "cheerio";
import { MessageType } from "@fosscord/util/dist/util/Constants";
// TODO: check webhook, application, system author
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; Discordbot/2.0; +https://discordapp.com)"
},
size: 1024 * 1024 * 1,
compress: true,
method: "GET"
};
export async function handleMessage(opts: Partial<Message>): Promise<Message> {
const channel = await Channel.findOneOrFail(
{ id: opts.channel_id },
{ select: ["guild_id", "type", "permission_overwrites", "recipient_ids", "owner_id"] }
); // lean is needed, because we don't want to populate .recipients that also auto deletes .recipient_ids
if (!channel || !opts.channel_id) throw new HTTPError("Channel not found", 404);
// TODO: are tts messages allowed in dm channels? should permission be checked?
// @ts-ignore
const permission = await getPermission(opts.author_id, channel.guild_id, opts.channel_id, { channel });
permission.hasThrow("SEND_MESSAGES");
if (opts.tts) permission.hasThrow("SEND_TTS_MESSAGES");
if (opts.message_reference) {
permission.hasThrow("READ_MESSAGE_HISTORY");
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");
// TODO: should be checked if the referenced message exists?
// @ts-ignore
opts.type = MessageType.REPLY;
}
if (!opts.content && !opts.embeds?.length && !opts.attachments?.length && !opts.stickers?.length && !opts.activity) {
throw new HTTPError("Empty messages are not allowed", 50006);
}
var content = opts.content;
var mention_channels_ids = [] as string[];
var mention_role_ids = [] as string[];
var mention_user_ids = [] as string[];
var mention_everyone = false;
var mention_everyone = false;
if (content) {
content = content.trim();
for (const [_, mention] of content.matchAll(CHANNEL_MENTION)) {
if (!mention_channels_ids.includes(mention)) mention_channels_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);
}
}
// TODO: check and put it all in the body
return {
...opts,
guild_id: channel.guild_id,
channel_id: opts.channel_id,
mention_channels_ids,
mention_role_ids,
mention_user_ids,
mention_everyone,
attachments: opts.attachments || [],
embeds: opts.embeds || [],
reactions: opts.reactions || [],
type: opts.type ?? 0
};
}
// 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, 5); // embed max 5 links
for (const link of links) {
try {
const request = await fetch(link, DEFAULT_FETCH_OPTIONS);
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 }, data)
]);
}
export async function sendMessage(opts: Partial<Message>) {
const message = await handleMessage({ ...opts, id: Snowflake.generate(), timestamp: new Date() });
const data = await new Message(message)
.populate({ path: "member", select: PublicMemberProjection })
.populate("referenced_message")
.save();
await emitEvent({ event: "MESSAGE_CREATE", channel_id: opts.channel_id, data } as MessageCreateEvent);
postHandleMessage(data).catch((e) => {}); // no await as it shouldnt block the message send function and silently catch error
return data;
}
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