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index.js
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index.js
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const EventEmitter = require('events');
const hypertrie = require('hypertrie');
const dedent = require('dedent');
const isOptions = require('is-options');
const base32 = require('bs32');
const { algs } = require('bns/lib/constants');
const dnssec = require('bns/lib/dnssec');
const { Zone, wire, util } = require('bns');
const { types, typesByVal, codes } = wire;
class Hyperzone extends EventEmitter {
constructor (storage, key, opts = {}) {
super();
if (isOptions(storage) && (storage.storage || storage.origin)) {
opts = storage;
storage = opts.storage || (opts.origin ? util.fqdn(opts.origin) : null);
} else if (isOptions(key)) {
opts = key;
key = null;
}
if (key && typeof key === 'string') {
if (key.length === 52) {
key = base32.decode(key);
} else if (key.length < 52) {
key = Buffer.from(key, 'base64');
} else if (key.length === 64) {
key = Buffer.from(key, 'hex');
}
}
if (opts.origin) {
this._origin = util.fqdn(opts.origin);
} else if (typeof storage === 'string' && util.isFQDN(storage)) {
this._origin = storage;
}
this.db = hypertrie(storage, key, opts);
this.isReady = false;
this.db.on('error', console.error);
this.db.ready(this.initialize.bind(this));
}
ready () {
return new Promise((resolve, reject) => {
if (this.isReady) {
resolve();
} else {
this.on('ready', resolve);
}
});
}
async initialize () {
const origin = await this.origin();
if (origin) {
if (!this._origin) {
this._origin = origin;
} else {
if (origin !== this._origin) {
throw new Error('Origin mismatch');
}
}
} else {
if (this._origin && this.db.feed.writable) {
await new Promise((resolve, reject) => {
this.db.put('ORIGIN', this._origin, (error, entry) => {
if (!error) {
resolve(entry);
} else {
console.error(error);
}
});
});
} else {
if (this.db.feed.writable) {
throw new Error('Origin required');
} else {
await this.origin();
}
}
}
if (this._origin) {
this.db.get('DNSKEY/0', this.handlednskey.bind(this));
} else {
const watcher = this.db.watch('ORIGIN', async () => {
this._origin = await this.origin();
this.db.get('DNSKEY/0', this.handlednskey.bind(this));
watcher.destroy();
});
}
}
handlednskey (error, record) {
if (error) {
throw error;
}
record = record ? record.value.toString() : null;
if (this.db.feed.writable && record === null) {
const flags = 256; // todo: make KSK an option
const priv = this.db.secretKey.slice(0, 32);
const pub = this.db.key;
const alg = algs.ED25519;
const keyRecord = dnssec.createKey(this._origin, alg, pub, flags);
const sig = dnssec.sign(keyRecord, this.priv, [keyRecord], null);
const rrs = [keyRecord, sig];
const text = this.toText(rrs);
this.db.put('DNSKEY/0', text, (error) => {
if (!error) {
this.isReady = true;
this.emit('ready');
} else {
throw error;
}
});
} else {
this.isReady = true;
this.emit('ready');
}
}
get pub () {
return base32.encode(this.db.key);
}
get priv () {
return this.db.secretKey.slice(0, 32);
}
origin () {
return new Promise((resolve, reject) => {
this.db.get('ORIGIN', (error, entry) => {
if (!error && entry) {
resolve(entry.value.toString());
} else {
resolve(null);
}
});
});
}
key () {
return new Promise(async (resolve, reject) => {
this.db.get('DNSKEY/0', (error, record) => {
record = record ? record.value.toString() : null;
if (record) {
resolve(this.fromText(record)[0]);
} else {
resolve(null);
}
});
});
}
DS () {
return new Promise(async (resolve, reject) => {
const keyRecord = await this.key();
if (keyRecord) {
resolve(dnssec.createDS(keyRecord, null));
} else {
resolve(null);
}
});
}
put (text, lifespan = null) {
if (this.db.feed.writable) {
let rrs = this.fromText(dedent(text.trim()));
if (rrs.length) {
return new Promise(async (resolve, reject) => {
const key = await this.key();
const srrs = dnssec.sign(key, this.priv, rrs, lifespan);
rrs = [srrs, ...rrs];
let batchKey;
const index = this.db.feed.length - 1;
const batch = rrs.map((rr, i) => {
const value = this.toText(rr).trim();
const rrsigType = rr.type === types.RRSIG ? typesByVal[rr.data.typeCovered] : '';
const type = rrsigType || typesByVal[rr.type];
batchKey = `${type}/${index}`;
const key = `${batchKey}/${i}`;
return {
type: 'put',
key,
value
};
});
this.db.batch(batch, error => {
if (!error) {
resolve(batchKey);
} else {
reject(error);
}
});
});
} else {
throw new Error('Parsed no records');
}
} else {
throw new Error('Hyperzone not writable');
}
}
del (key) {
if (this.db.feed.writable) {
const batch = [];
return new Promise((resolve, reject) => {
this.db.createReadStream(key)
.on('error', reject)
.on('data', ({ key }) => {
key.indexOf('ORIGIN') < 0 && key.indexOf('DNSKEY') < 0 && batch.push({
type: 'del',
key
});
})
.on('end', async () => {
this.db.batch(batch, (error, results) => {
if (!error) {
resolve(batch);
} else {
reject(error);
}
});
});
});
} else {
throw new Error('Hyperzone not writable');
}
}
get (key) {
const results = [];
return new Promise((resolve, reject) => {
this.db.createReadStream(key)
.on('error', reject)
.on('data', data => {
results.push(data);
})
.on('end', _ => {
resolve(results);
});
});
}
resolve (name, type, origin) {
if (typeof type === 'number') {
type = typesByVal[type];
}
const zone = new Zone();
zone.setOrigin(origin || this._origin);
const push = data => {
try {
if (data.value) {
const value = data.value.toString();
zone.fromString(value);
}
} catch (err) {}
};
return new Promise((resolve, reject) => {
let n = 0;
const handle = (err, rr) => {
rr.map(push);
if (!--n) {
try {
const res = zone.resolve(name, types[type]);
// https://github.com/chjj/bns/pull/22
if (types[type] === types.A && res && res.answer && res.answer.length === 0) {
const r = zone.resolve(name, types.CNAME);
res.answer.push(...r.answer);
if (res.answer.length) {
res.code = codes.NOERROR;
}
}
if (res.answer.length === 0 && res.authority.length === 0 && res.additional.length === 0) {
res.code = codes.NXDOMAIN;
}
resolve(res);
} catch (error) {
reject(error);
}
}
};
n = 3;
this.db.list(type, handle);
this.db.list('DS', handle);
this.db.list('NS', handle);
if (type === 'A') {
n += 2;
this.db.list('CNAME', handle);
this.db.list('AAAA', handle);
}
if (type === 'CNAME') {
n += 2;
this.db.list('A', handle);
this.db.list('AAAA', handle);
}
});
}
fromText (text, origin) {
return Hyperzone.fromText(text, origin || this._origin);
}
toText (rrs) {
return Hyperzone.toText(rrs);
}
static fromText (text, origin) {
return wire.fromZone(text, origin);
}
static toText (rrs) {
if (!Array.isArray(rrs)) {
rrs = [rrs];
}
return wire.toZone(rrs);
}
}
module.exports = Hyperzone;