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allow multiple dnslinks with different namespaces

This commit is contained in:
Karol Wypchlo 2021-07-08 14:52:39 +02:00
parent c9a13cab8e
commit 7a135ed5ed
1 changed files with 12 additions and 10 deletions
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22
packages/dnslink-api/src/index.js
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@ -3,15 +3,17 @@ const express = require("express");
const NodeCache = require("node-cache"); const NodeCache = require("node-cache");
const isValidDomain = require("is-valid-domain"); const isValidDomain = require("is-valid-domain");
const host = process.env.HOSTNAME || "0.0.0.0"; const host = process.env.DNSLINK_API_HOSTNAME || "0.0.0.0";
const port = Number(process.env.PORT) || 3100; const port = Number(process.env.DNSLINK_API_PORT) || 3100;
const cacheTTL = Number(process.env.DNSLINK_API_CACHE_TTL) || 300; // default to 5 minutes
const server = express(); const server = express();
const cache = new NodeCache({ stdTTL: 300 }); // cache for 5 minutes const cache = new NodeCache({ stdTTL: cacheTTL });
const dnslinkRegExp = /^dnslink=.+$/; const dnslinkNamespace = "skynet-ns";
const skylinkDnslinkRegExp = /^dnslink=\/skynet-ns\/([a-zA-Z0-9_-]{46}|[a-z0-9]{55})/; const dnslinkRegExp = new RegExp(`^dnslink=/${dnslinkNamespace}/.+$`);
const hint = "valid example: dnslink=/skynet-ns/3ACpC9Umme41zlWUgMQh1fw0sNwgWwyfDDhRQ9Sppz9hjQ"; const dnslinkSkylinkRegExp = new RegExp(`^dnslink=/${dnslinkNamespace}/([a-zA-Z0-9_-]{46}|[a-z0-9]{55})`);
const hint = `valid example: dnslink=/${dnslinkNamespace}/3ACpC9Umme41zlWUgMQh1fw0sNwgWwyfDDhRQ9Sppz9hjQ`;
server.get("/dnslink/:name", async (req, res) => { server.get("/dnslink/:name", async (req, res) => {
const success = (skylink) => res.set("Skynet-Skylink", skylink).send(skylink); const success = (skylink) => res.set("Skynet-Skylink", skylink).send(skylink);
@ -47,18 +49,18 @@ server.get("/dnslink/:name", async (req, res) => {
const dnslinks = records.flat().filter((record) => dnslinkRegExp.test(record)); const dnslinks = records.flat().filter((record) => dnslinkRegExp.test(record));
if (dnslinks.length === 0) { if (dnslinks.length === 0) {
return failure(`TXT records for ${lookup} found but none of them contained valid dnslink - ${hint}`); return failure(`TXT records for ${lookup} found but none of them contained valid skynet dnslink - ${hint}`);
} }
if (dnslinks.length > 1) { if (dnslinks.length > 1) {
return failure(`Multiple TXT records with valid dnslink found for ${lookup}, only one allowed`); return failure(`Multiple TXT records with valid skynet dnslink found for ${lookup}, only one allowed`);
} }
const [dnslink] = dnslinks; const [dnslink] = dnslinks;
const matchSkylink = dnslink.match(skylinkDnslinkRegExp); const matchSkylink = dnslink.match(dnslinkSkylinkRegExp);
if (!matchSkylink) { if (!matchSkylink) {
return failure(`TXT record with dnslink for ${lookup} contains invalid skylink - ${hint}`); return failure(`TXT record with skynet dnslink for ${lookup} contains invalid skylink - ${hint}`);
} }
const skylink = matchSkylink[1]; const skylink = matchSkylink[1];