rudeshark.net/src/remote/resolve-user.ts

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import { toUnicode, toASCII } from 'punycode';
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import User from '../models/user';
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import webFinger from './webfinger';
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import config from '../config';
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import { createPerson } from './activitypub/models/person';
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export default async (username, _host, option) => {
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const usernameLower = username.toLowerCase();
const hostAscii = toASCII(_host).toLowerCase();
const host = toUnicode(hostAscii);
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if (config.host == host) {
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return await User.findOne({ usernameLower });
}
let user = await User.findOne({ usernameLower, host }, option);
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if (user === null) {
const acctLower = `${usernameLower}@${hostAscii}`;
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const finger = await webFinger(acctLower);
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const self = finger.links.find(link => link.rel && link.rel.toLowerCase() === 'self');
if (!self) {
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throw new Error('self link not found');
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}
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user = await createPerson(self.href);
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}
return user;
};