116 lines
3.4 KiB
Markdown
116 lines
3.4 KiB
Markdown
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# Connector
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Undici creates the underlying socket via the connector builder.
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Normally, this happens automatically and you don't need to care about this,
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but if you need to perform some additional check over the currently used socket,
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this is the right place.
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If you want to create a custom connector, you must import the `buildConnector` utility.
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#### Parameter: `buildConnector.BuildOptions`
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Every Tls option, see [here](https://nodejs.org/api/tls.html#tls_tls_connect_options_callback).
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Furthermore, the following options can be passed:
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* **socketPath** `string | null` (optional) - Default: `null` - An IPC endpoint, either Unix domain socket or Windows named pipe.
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* **maxCachedSessions** `number | null` (optional) - Default: `100` - Maximum number of TLS cached sessions. Use 0 to disable TLS session caching. Default: `100`.
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* **timeout** `number | null` (optional) - In milliseconds. Default `10e3`.
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* **servername** `string | null` (optional)
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Once you call `buildConnector`, it will return a connector function, which takes the following parameters.
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#### Parameter: `connector.Options`
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* **hostname** `string` (required)
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* **host** `string` (optional)
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* **protocol** `string` (required)
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* **port** `string` (required)
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* **servername** `string` (optional)
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* **localAddress** `string | null` (optional) Local address the socket should connect from.
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* **httpSocket** `Socket` (optional) Establish secure connection on a given socket rather than creating a new socket. It can only be sent on TLS update.
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### Basic example
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```js
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'use strict'
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import { Client, buildConnector } from 'undici'
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const connector = buildConnector({ rejectUnauthorized: false })
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const client = new Client('https://localhost:3000', {
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connect (opts, cb) {
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connector(opts, (err, socket) => {
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if (err) {
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cb(err)
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} else if (/* assertion */) {
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socket.destroy()
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cb(new Error('kaboom'))
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} else {
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cb(null, socket)
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}
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})
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}
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})
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```
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### Example: validate the CA fingerprint
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```js
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'use strict'
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import { Client, buildConnector } from 'undici'
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const caFingerprint = 'FO:OB:AR'
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const connector = buildConnector({ rejectUnauthorized: false })
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const client = new Client('https://localhost:3000', {
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connect (opts, cb) {
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connector(opts, (err, socket) => {
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if (err) {
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cb(err)
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} else if (getIssuerCertificate(socket).fingerprint256 !== caFingerprint) {
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socket.destroy()
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cb(new Error('Fingerprint does not match or malformed certificate'))
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} else {
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cb(null, socket)
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}
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})
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}
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})
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client.request({
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path: '/',
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method: 'GET'
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}, (err, data) => {
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if (err) throw err
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const bufs = []
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data.body.on('data', (buf) => {
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bufs.push(buf)
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})
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data.body.on('end', () => {
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console.log(Buffer.concat(bufs).toString('utf8'))
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client.close()
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})
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})
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function getIssuerCertificate (socket) {
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let certificate = socket.getPeerCertificate(true)
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while (certificate && Object.keys(certificate).length > 0) {
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// invalid certificate
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if (certificate.issuerCertificate == null) {
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return null
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}
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// We have reached the root certificate.
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// In case of self-signed certificates, `issuerCertificate` may be a circular reference.
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if (certificate.fingerprint256 === certificate.issuerCertificate.fingerprint256) {
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break
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}
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// continue the loop
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certificate = certificate.issuerCertificate
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}
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return certificate
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}
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```
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