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implement fetching host-meta before the webfinger endpoint

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code ported from iceshrimp: c3e685a925/packages/backend/src/remote/webfinger.ts
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slonkazoid 2024-07-09 05:31:25 +03:00
parent c4f4041cf8
commit 7a62e1be31
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3 changed files with 74 additions and 11 deletions
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1
packages/backend/package.json
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@ -112,6 +112,7 @@
"content-disposition": "0.5.4",
"date-fns": "2.30.0",
"deep-email-validator": "0.1.21",
"fast-xml-parser": "^4.4.0",
"fastify": "4.26.2",
"fastify-multer": "^2.0.3",
"fastify-raw-body": "4.3.0",

63
packages/backend/src/core/WebfingerService.ts
View file

@ -5,7 +5,7 @@
import { URL } from 'node:url';
import { Injectable } from '@nestjs/common';
import { query as urlQuery } from '@/misc/prelude/url.js';
import { XMLParser } from 'fast-xml-parser';
import { HttpRequestService } from '@/core/HttpRequestService.js';
import { bindThis } from '@/decorators.js';
@ -31,25 +31,76 @@ export class WebfingerService {
@bindThis
public async webfinger(query: string): Promise<IWebFinger> {
const url = this.genUrl(query);
const hostMetaUrl = this.queryToHostMetaUrl(query);
const template = await this.fetchHostMeta(hostMetaUrl) ?? this.queryToWebFingerTemplate(query);
const url = this.genUrl(query, template);
return await this.httpRequestService.getJson<IWebFinger>(url, 'application/jrd+json, application/json');
}
@bindThis
private genUrl(query: string): string {
private genUrl(query: string, template: string): string {
if (template.indexOf('{uri}') < 0) throw new Error(`Invalid webFingerUrl: ${template}`);
if (query.match(/^https?:\/\//)) {
return template.replace('{uri}', encodeURIComponent(query));
}
const m = query.match(/^([^@]+)@(.*)/);
if (m) {
return template.replace('{uri}', encodeURIComponent(`acct:${query}`));
}
throw new Error(`Invalid query (${query})`);
}
@bindThis
private queryToWebFingerTemplate(query: string): string {
if (query.match(/^https?:\/\//)) {
const u = new URL(query);
return `${u.protocol}//${u.hostname}/.well-known/webfinger?resource={uri}`;
}
const m = query.match(/^([^@]+)@(.*)/);
if (m) {
const hostname = m[2];
return `https://${hostname}/.well-known/webfinger?resource={uri}`;
}
throw new Error(`Invalid query (${query})`);
}
@bindThis
private queryToHostMetaUrl(query: string): string {
if (query.match(urlRegex)) {
const u = new URL(query);
return `${u.protocol}//${u.hostname}/.well-known/webfinger?` + urlQuery({ resource: query });
return `${u.protocol}//${u.hostname}/.well-known/host-meta`;
}
const m = query.match(mRegex);
if (m) {
const hostname = m[2];
const useHttp = process.env.MISSKEY_WEBFINGER_USE_HTTP && process.env.MISSKEY_WEBFINGER_USE_HTTP.toLowerCase() === 'true';
return `http${useHttp ? '' : 's'}://${hostname}/.well-known/webfinger?${urlQuery({ resource: `acct:${query}` })}`;
return `https://${hostname}/.well-known/host-meta`;
}
throw new Error(`Invalid query (${query})`);
}
@bindThis
private async fetchHostMeta(url: string): Promise<string | null> {
try {
const res = await this.httpRequestService.getHtml(url, 'application/xrd+xml');
const options = {
ignoreAttributes: false,
isArray: (_name: string, jpath: string) => jpath === 'XRD.Link',
};
const parser = new XMLParser(options);
const hostMeta = parser.parse(res);
const template = (hostMeta['XRD']['Link'] as Array<any>).filter(p => p['@_rel'] === 'lrdd')[0]['@_template'];
return template.indexOf('{uri}') < 0 ? null : template;
} catch (err) {
console.error(`error while request host-meta for ${url}`);
return null;
}
}
}