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import { APError, fetchOpts } from "@spacebar/ap";
import {
Channel,
Config,
DmChannelDTO,
Member,
Message,
Snowflake,
User,
UserSettings,
WebfingerResponse,
} from "@spacebar/util";
import { APNote, APPerson, AnyAPObject } from "activitypub-types";
import fetch from "node-fetch";
import { ProxyAgent } from "proxy-agent";
import TurndownService from "turndown";
const hasAPContext = (data: object) => {
if (!("@context" in data)) return false;
const context = data["@context"];
const activitystreams = "https://www.w3.org/ns/activitystreams";
if (Array.isArray(context))
return context.find((x) => x == activitystreams);
return context == activitystreams;
};
export const resolveAPObject = async <T>(data: string | T): Promise<T> => {
// we were already given an AP object
if (typeof data != "string") return data;
const agent = new ProxyAgent();
const ret = await fetch(data, {
...fetchOpts,
agent,
});
const json = await ret.json();
if (!hasAPContext(json)) throw new APError("Object is not APObject");
return json;
};
export const resolveWebfinger = async (
lookup: string,
): Promise<AnyAPObject> => {
let domain: string, user: string;
if (lookup.includes("@")) {
// lookup a @handle
if (lookup[0] == "@") lookup = lookup.slice(1);
[domain, user] = lookup.split("@");
} else {
// lookup was a URL ( hopefully )
const url = new URL(lookup);
domain = url.hostname;
user = url.pathname.split("/").reverse()[0];
}
const agent = new ProxyAgent();
const wellknown = (await fetch(
`https://${domain}/.well-known/webfinger?resource=${lookup}`,
{
agent,
...fetchOpts,
},
).then((x) => x.json())) as WebfingerResponse;
const link = wellknown.links.find((x) => x.rel == "self");
if (!link) throw new APError(".well-known did not contain rel=self link");
return await resolveAPObject<AnyAPObject>(link.href);
};
export const messageFromAP = async (data: APNote): Promise<Message> => {
if (!data.id) throw new APError("Message must have ID");
if (data.type != "Note") throw new APError("Message must be Note");
if (!data.attributedTo)
throw new APError("Message must have author (attributedTo)");
const attrib = await resolveAPObject(
Array.isArray(data.attributedTo)
? data.attributedTo[0] // hmm
: data.attributedTo,
);
if (!APObjectIsPerson(attrib))
throw new APError("Message attributedTo must be Person");
const user = await userFromAP(attrib);
const to = Array.isArray(data.to)
? data.to.filter((x) =>
typeof x == "string"
? x.includes("channel") || x.includes("user")
: false,
)[0]
: data.to;
if (!to || typeof to != "string")
throw new APError("Message not deliverable");
// TODO: use a regex
let channel: Channel | DmChannelDTO;
const to_id = to.split("/").reverse()[0];
if (to.includes("user")) {
// this is a DM channel
const toUser = await User.findOneOrFail({ where: { id: to_id } });
// Channel.createDMCHannel does a .save() so the author must be present
await user.save();
// const cache = await Channel.findOne({ where: { recipients: []}})
channel = await Channel.createDMChannel(
[toUser.id, user.id],
toUser.id,
);
} else {
channel = await Channel.findOneOrFail({
where: { id: to_id },
relations: { guild: true },
});
}
const member =
channel instanceof Channel
? await Member.findOneOrFail({
where: { id: user.id, guild_id: channel.guild!.id },
})
: undefined;
return Message.create({
id: Snowflake.generate(),
federatedId: data.id,
content: new TurndownService().turndown(data.content),
timestamp: data.published,
author: user,
guild: channel instanceof Channel ? channel.guild : undefined,
member,
channel_id: channel.id,
type: 0,
sticker_items: [],
attachments: [],
embeds: [],
reactions: [],
mentions: [],
mention_roles: [],
mention_channels: [],
});
};
export const APObjectIsPerson = (object: AnyAPObject): object is APPerson => {
return object.type == "Person";
};
export const userFromAP = async (data: APPerson): Promise<User> => {
if (!data.id) throw new APError("User must have ID");
const url = new URL(data.id);
const email = `${url.pathname.split("/").reverse()[0]}@${url.hostname}`;
// don't like this
// the caching should probably be done elsewhere
// this function should only be for converting AP to SB (ideally)
const cache = await User.findOne({
where: { federatedId: url.toString() },
});
if (cache) return cache;
return User.create({
federatedId: url.toString(),
username: data.preferredUsername,
discriminator: url.hostname,
bio: new TurndownService().turndown(data.summary),
email,
data: {
hash: "#",
valid_tokens_since: new Date(),
},
extended_settings: "{}",
settings: UserSettings.create(),
publicKey: "",
privateKey: "",
premium: false,
premium_since: Config.get().defaults.user.premium
? new Date()
: undefined,
rights: Config.get().register.defaultRights,
premium_type: Config.get().defaults.user.premiumType ?? 0,
verified: Config.get().defaults.user.verified ?? true,
created_at: new Date(),
});
};
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