85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
const express = require("express");
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const NodeCache = require("node-cache");
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const { NodeClient } = require("hs-client");
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const host = process.env.HOSTNAME || "0.0.0.0";
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const port = Number(process.env.PORT) || 3100;
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const hsdNetworkType = process.env.HSD_NETWORK || "regtest";
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const hsdHost = process.env.HSD_HOST || "localhost";
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const hsdPort = Number(process.env.HSD_PORT) || 12037;
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const hsdApiKey = process.env.HSD_API_KEY || "foo";
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const clientOptions = {
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network: hsdNetworkType,
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host: hsdHost,
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port: hsdPort,
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apiKey: hsdApiKey,
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};
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const client = new NodeClient(clientOptions);
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const cache = new NodeCache({ stdTTL: 300 }); // cache for 5 minutes
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// Match both `sia://HASH` and `HASH` links.
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const startsWithSkylinkRegExp = /^(sia:\/\/)?[a-zA-Z0-9_-]{46}/;
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const getDomainRecords = async (name) => {
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if (cache.has(name)) return cache.get(name);
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const response = await client.execute("getnameresource", [name]);
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const records = response?.records ?? null;
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console.log(`${name} => ${JSON.stringify(records)}`);
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cache.set(name, records);
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return records;
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};
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const findSkylinkRecord = (records) => {
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// Find the last one, so people can update their domains in a non-destructive
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// way by simply adding a new link. This will also allow keeping links to
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// older versions for backwards compatibility.
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return records
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?.slice()
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.reverse()
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.find(({ txt }) => txt?.some((entry) => isValidSkylink(entry)));
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};
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const getSkylinkFromRecord = (record) => {
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return record?.txt?.find((entry) => isValidSkylink(entry));
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};
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const resolveDomainHandler = async (req, res) => {
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try {
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const records = await getDomainRecords(req.params.name);
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if (!records) return res.status(404).send(`No records found for ${req.params.name}`);
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const record = findSkylinkRecord(records);
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if (!record) throw new Error(`No skylink found in dns records of ${req.params.name}`);
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const skylink = getSkylinkFromRecord(record);
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return res.json({ skylink });
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} catch (error) {
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res.status(500).send(`Handshake error: ${error.message}`);
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}
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};
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// Checks if the given string is a valid Sia link.
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function isValidSkylink(link) {
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if (!link || link.length === 0) {
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return false;
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}
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return Boolean(link.match(startsWithSkylinkRegExp));
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}
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const server = express();
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server.get("/hnsres/:name", resolveDomainHandler);
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server.listen(port, host, (error) => {
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if (error) throw error;
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console.info(`API will look for HSD Server at ${hsdHost}:${hsdPort}, "${hsdNetworkType}" network.`);
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console.info(`Server listening at http://${host}:${port}`);
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});
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