290 lines
9.7 KiB
Markdown
290 lines
9.7 KiB
Markdown
[](https://gitter.im/Daplie/letsencrypt-express?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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| **letsencrypt** (library)
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| [letsencrypt-cli](https://github.com/Daplie/letsencrypt-cli)
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| [letsencrypt-express](https://github.com/Daplie/letsencrypt-express)
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| [letsencrypt-koa](https://github.com/Daplie/letsencrypt-koa)
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| [letsencrypt-hapi](https://github.com/Daplie/letsencrypt-hapi)
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letsencrypt
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===========
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Automatic [Let's Encrypt](https://letsencrypt.org) HTTPS Certificates for node.js
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* [Automatic HTTPS with ExpressJS](https://github.com/Daplie/letsencrypt-express)
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* [Automatic live renewal](https://github.com/Daplie/letsencrypt-express#how-automatic)
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* On-the-fly HTTPS certificates for Dynamic DNS (in-process, no server restart)
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* Works with node cluster out of the box
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* usable [via commandline](https://github.com/Daplie/letsencrypt-cli) as well
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* Free SSL (HTTPS Certificates for TLS)
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* [90-day certificates](https://letsencrypt.org/2015/11/09/why-90-days.html)
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**See Also**
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* [Let's Encrypt in (exactly) 90 seconds with Caddy](https://daplie.com/articles/lets-encrypt-in-literally-90-seconds/)
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* [lego](https://github.com/xenolf/lego): Let's Encrypt for golang
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STOP
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====
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**These aren't the droids you're looking for.**
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This is a low-level library for implementing CLIs,
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system tools, and abstracting storage backends (file vs db, etc).
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This is not the thing to use in your webserver directly.
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### Use [letsencrypt-express](https://github.com/Daplie/letsencrypt-express) if...
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you are planning to use one of these:
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* `express`
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* `connect`
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* raw `https`
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* raw `spdy`
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* `restify` (same as raw https)
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* `hapi` See [letsencrypt-hapi](https://github.com/Daplie/letsencrypt-hapi)
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* `koa` See [letsencrypt-koa](https://github.com/Daplie/letsencrypt-koa)
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* `rill` (similar to koa example)
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### Use [letsencrypt-cli](https://github.com/Daplie/letsencrypt-cli) if...
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You are planning to use one of these:
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* `bash`
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* `fish`
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* `zsh`
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* `cmd.exe`
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* `PowerShell`
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Install
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=======
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```bash
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npm install --save letsencrypt
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```
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Usage
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=====
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### letsencrypt
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There are **NO DEFAULTS**.
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A number of **constants** (such as LE.stagingServerUrl and LE.configDir)
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are exported for your convenience, but all required options must be specified by the library invoking the call.
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Open an issue if you need a variable for something that isn't there yet.
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```javascript
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var LE = require('letsencrypt');
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var config = {
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server: LE.stagingServerUrl // or LE.productionServerUrl
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, configDir: require('homedir')() + '/letsencrypt/etc' // or /etc/letsencrypt or wherever
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, privkeyPath: ':config/live/:hostname/privkey.pem' //
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, fullchainPath: ':config/live/:hostname/fullchain.pem' // Note: both that :config and :hostname
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, certPath: ':config/live/:hostname/cert.pem' // will be templated as expected
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, chainPath: ':config/live/:hostname/chain.pem' //
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, debug: false
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};
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var handlers = {
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setChallenge: function (opts, hostname, key, val, cb) {} // called during the ACME server handshake, before validation
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, removeChallenge: function (opts, hostname, key, cb) {} // called after validation on both success and failure
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, getChallenge: function (opts, hostname, key, cb) {} // this is special because it is called by the webserver
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// (see letsencrypt-cli/bin & letsencrypt-express/standalone),
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// not by the library itself
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, agreeToTerms: function (tosUrl, cb) {} // gives you an async way to expose the legal agreement
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// (terms of use) to your users before accepting
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};
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var le = LE.create(config, handlers);
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// checks :conf/renewal/:hostname.conf
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le.register({ // and either renews or registers
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domains: ['example.com'] // CHANGE TO YOUR DOMAIN
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, email: 'user@email.com' // CHANGE TO YOUR EMAIL
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, agreeTos: false // set to true to automatically accept an agreement
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// which you have pre-approved (not recommended)
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}, function (err) {
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if (err) {
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// Note: you must have a webserver running
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// and expose handlers.getChallenge to it
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// in order to pass validation
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// See letsencrypt-cli and or letsencrypt-express
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console.error('[Error]: node-letsencrypt/examples/standalone');
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console.error(err.stack);
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} else {
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console.log('success');
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}
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});
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```
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**However**, due to the nature of what this library does, it has a few more "moving parts"
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than what makes sense to show in a minimal snippet.
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API
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===
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```javascript
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LetsEncrypt.create(leConfig, handlers, backend) // wraps a given "backend" (the python or node client)
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LetsEncrypt.stagingServer // string of staging server for testing
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le.middleware() // middleware for serving webrootPath to /.well-known/acme-challenge
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le.sniCallback(hostname, function (err, tlsContext) {}) // uses fetch (below) and formats for https.SNICallback
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le.register({ domains, email, agreeTos, ... }, cb) // registers or renews certs for a domain
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le.fetch({domains, email, agreeTos, ... }, cb) // fetches certs from in-memory cache, occasionally refreshes from disk
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le.registrationFailureCallback(err, args, certInfo, cb) // called when registration fails (not implemented yet)
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```
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### `LetsEncrypt.create(backend, leConfig, handlers)`
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#### leConfig
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The arguments passed here (typically `webpathRoot`, `configDir`, etc) will be merged with
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any `args` (typically `domains`, `email`, and `agreeTos`) and passed to the backend whenever
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it is called.
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Typically the backend wrapper will already merge any necessary backend-specific arguments.
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**Example**:
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```javascript
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{ webrootPath: __dirname, '/acme-challenge'
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, fullchainTpl: '/live/:hostname/fullchain.pem'
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, privkeyTpl: '/live/:hostname/fullchain.pem'
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, configDir: '/etc/letsencrypt'
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}
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```
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Note: `webrootPath` can be set as a default, semi-locally with `webrootPathTpl`, or per
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registration as `webrootPath` (which overwrites `leConfig.webrootPath`).
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#### handlers *optional*
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`h.setChallenge(hostnames, name, value, cb)`:
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default is to write to fs
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`h.getChallenge(hostnames, value cb)`
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default is to read from fs
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`h.sniRegisterCallback(args, currentCerts, cb)`
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The default is to immediately call `cb(null, null)` and register (or renew) in the background
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during the `SNICallback` phase. Right now it isn't reasonable to renew during SNICallback,
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but around February when it is possible to use ECDSA keys (as opposed to RSA at present),
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registration will take very little time.
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This will not be called while another registration is already in progress.
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### `le.middleware()`
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An express handler for `/.well-known/acme-challenge/<challenge>`.
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Will call `getChallenge([hostname], key, cb)` if present or otherwise read `challenge` from disk.
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Example:
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```javascript
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app.use('/', le.middleware())
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```
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### `le.sniCallback(hostname, function (err, tlsContext) {});`
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Will call `fetch`. If fetch does not return certificates or returns expired certificates
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it will call `sniRegisterCallback(args, currentCerts, cb)` and then return the error,
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the new certificates, or call `fetch` a final time.
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Example:
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```javascript
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var server = require('https').createServer({ SNICallback: le.sniCallback, cert: '...', key: '...' });
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server.on('request', app);
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```
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### `le.register({ domains, email, agreeTos, ... }, cb)`
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Get certificates for a domain
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Example:
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```javascript
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le.register({
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domains: ['example.com', 'www.example.com']
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, email: 'user@example.com'
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, webrootPath: '/srv/www/example.com/public'
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, agreeTos: true
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}, function (err, certs) {
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// err is some error
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console.log(certs);
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/*
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{ cert: "contents of fullchain.pem"
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, key: "contents of privkey.pem"
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, renewedAt: <date in milliseconds>
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, duration: <duration in milliseconds (90-days)>
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}
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*/
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});
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```
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### `le.isValidDomain(hostname)`
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returns `true` if `hostname` is a valid ascii or punycode domain name.
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(also exposed on the main exported module as `LetsEncrypt.isValidDomain()`)
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### `le.fetch(args, cb)`
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Used internally, but exposed for convenience.
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Checks in-memory cache of certificates for `args.domains` and calls then calls `backend.fetch(args, cb)`
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**after** merging `args` if necessary.
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### `le.registrationFailureCallback(err, args, certInfo, cb)`
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Not yet implemented
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This is what `args` looks like:
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```javascript
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{ domains: ['example.com', 'www.example.com']
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, email: 'user@email.com'
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, agreeTos: true
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, configDir: '/etc/letsencrypt'
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, fullchainTpl: '/live/:hostname/fullchain.pem' // :hostname will be replaced with the domainname
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, privkeyTpl: '/live/:hostname/privkey.pem'
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, webrootPathTpl: '/srv/www/:hostname/public'
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, webrootPath: '/srv/www/example.com/public' // templated from webrootPathTpl
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}
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```
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This is what the implementation should look like:
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(it's expected that the client will follow the same conventions as
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the python client, but it's not necessary)
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Change History
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==============
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* v1.5.0 now using letiny-core v2.0.0 and rsa-compat
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* v1.4.x I can't remember... but it's better!
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* v1.1.0 Added letiny-core, removed node-letsencrypt-python
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* v1.0.2 Works with node-letsencrypt-python
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* v1.0.0 Thar be dragons
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LICENSE
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=======
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Dual-licensed MIT and Apache-2.0
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See LICENSE
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