update README and code

README.md

@@ -1,8 +1,6 @@
 le-sni-auto
 ===========
 
-**DRAFT** this is not yet published to npm
-
 An auto-sni strategy for registering and renewing letsencrypt certificates using SNICallback.
 
 This does a couple of rather simple things:
@@ -31,10 +29,10 @@ With node-letsencrypt
 
 var leSni = require('le-sni-auto').create({
 
-  notBefore: 10 * 24 * 60 * 60 1000       // do not renew more than 10 days before expiration
+  renewWithin: 10 * 24 * 60 * 60 1000       // do not renew more than 10 days before expiration
-, notAfter: 5 * 24 * 60 * 60 1000         // do not wait more than 5 days before expiration
+, renewBy: 5 * 24 * 60 * 60 1000         // do not wait more than 5 days before expiration
 
-, httpsOptions: {
+, tlsOptions: {
     rejectUnauthorized: true              // These options will be used with tls.createSecureContext()
   , requestCert: false                    // in addition to key (privkey.pem) and cert (cert.pem + chain.pem),
   , ca: null                              // which are provided by letsencrypt
@@ -58,14 +56,15 @@ var le = require('letsencrypt').create({
 
 
 
+var redirectHttps = require('redirect-https').create();
+http.createServer(le.middleware(redirectHttps));
+
+
+
 var app = require('express')();
 var httpsOptions = { SNICallback: le.sni.callback };
-
 httpsOptions = require('localhost.daplie.com-certificates').merge(httpsOptions);
-
+https.createServer(dummyCerts, le.middleware(app)).listen(443);
-
-http.createServer(le.handleAcmeOrRedirectToHttps());
-https.createServer(dummyCerts, le.handleAcmeOrUse(app)).listen(443);
 ```
 
 You can also provide a thunk-style `getCertificates(domain, certs, cb)`.
@@ -77,12 +76,13 @@ Standalone
 'use strict';
 
 
-var le = require('letsencrypt').create({
+
-  notBefore: 10 * 24 * 60 * 60 1000       // do not renew prior to 10 days before expiration
+var leSni = require('le-sni-auto').create({
-, notAfter: 5 * 24 * 60 * 60 1000         // do not wait more than 5 days before expiration
+  renewWithin: 10 * 24 * 60 * 60 1000       // do not renew prior to 10 days before expiration
+, renewBy: 5 * 24 * 60 * 60 1000         // do not wait more than 5 days before expiration
 
   // key (privkey.pem) and cert (cert.pem + chain.pem) will be provided by letsencrypt
-, httpsOptions: { rejectUnauthorized: true, requestCert: false, ca: null, crl: null }
+, tlsOptions: { rejectUnauthorized: true, requestCert: false, ca: null, crl: null }
 
 , getCertificatesAsync: function (domain, certs) {
     // return a promise with an object with the following keys:
@@ -92,11 +92,87 @@ var le = require('letsencrypt').create({
 
 
 
+// some default certificates that work with localhost
+// (because default certificates are required as a fallback)
+var httpsOptions = require('localhost.daplie.com-certificates').merge({
+  SNICallback: leSni.sniCallback
+});
 
-var dummyCerts = require('localhost.daplie.com-certificates');
+https.createServer(httpsOptions, app);
-dummyCerts.SNICallback = le.sni.sniCallback;
-
-https.createServer(dummyCerts, );
 ```
 
 You can also provide a thunk-style `getCertificates(domain, certs, cb)`.
+
+API
+===
+
+* create(options)
+  * `getCertificates(domain, certs, cb)` or `getCertificatesAsync(domain, certs)`
+  * `renewWithin` (default 7 days, min 3 days)
+  * `renewBy` (default 2 days, min 12 hours)
+* `sniCallback(domain, cb)`
+* `cacheCerts(certs)`
+
+.renewWithin
+-----------
+
+Specifies the maximum amount of time (in ms) before
+the certificate expires to renew it.
+
+Say the cert expires in 90 days and you would like
+to renew, **at earliest** 10 days before it expires.
+
+You would set this to `10 * 24 * 60 * 60 * 1000`.
+
+.renewBy
+--------
+
+Specifies the maximum amount of time (in ms) before
+the certificate expires to renew it.
+
+Say the cert expires in 90 days and you would like
+to renew, **at latest** 10 days before it expires.
+
+You would set this to `10 * 24 * 60 * 60 * 1000`.
+
+**MUST** be **less than** `renewWithin`.
+
+.sniCallback()
+-----------
+
+This gets passed to `https.createServer(httpsOptions, app)` as `httpsOptions.SNICallback`.
+
+```javascript
+var leSni = require('le-sni-auto').create({
+  renewWithin: 10 * 24 * 60 * 60 1000
+});
+
+var httpsOptions = require('localhost.daplie.com-certificates').merge({
+  SNICallback: leSni.sniCallback
+});
+
+function app(req, res) {
+  res.end("Hello, World!");
+}
+
+https.createServer(httpsOptions, app);
+```
+
+.cacheCerts()
+-----------
+
+Manually load a certificate into the cache.
+
+This is useful in a cluster environment where the master
+may wish to inform multiple workers of a new or renewed certificate.
+
+```
+leSni.cacheCerts({
+, privkey: '<<privkey.pem>>'
+, cert: '<<cert.pem + chain.pem>>'
+, subject: 'example.com'
+, altnames: [ 'example.com', 'www.example.com' ]
+, issuedAt: 1470975565000
+, expiresAt: 1478751565000
+});
+```

index.js

@@ -1,21 +1,39 @@
 'use strict';
 
-// autoSni = { notBefore, notAfter, getCertificates, httpsOptions, _dbg_now }
+var DAY = 24 * 60 * 60 * 1000;
+var MIN = 60 * 1000;
+var defaults = {
+  // don't renew before the renewWithin period
+  renewWithin: 7 * DAY
+, _renewWithinMin: 3 * DAY
+  // renew before the renewBy period
+, renewBy: 2 * DAY
+, _renewByMin: Math.floor(DAY / 2)
+  // just to account for clock skew really
+, _dropDead: 5 * MIN
+};
+
+// autoSni = { renewWithin, renewBy, getCertificates, tlsOptions, _dbg_now }
 module.exports.create = function (autoSni) {
 
-  var DAY = 24 * 60 * 60 * 1000;
-  var MIN = 60 * 1000;
   if (!autoSni.getCertificatesAsync) { autoSni.getCertificatesAsync = require('bluebird').promisify(autoSni.getCertificates); }
-  if (!autoSni.notBefore) { throw new Error("must supply options.notBefore (and options.notAfter)"); }
+  if (!autoSni.renewWithin) { autoSni.renewWithin = autoSni.notBefore || defaults.renewWithin; }
-  if (!autoSni.notAfter) { autoSni.notAfter = autoSni.notBefore - (3 * DAY); }
+  if (autoSni.renewWithin < defaults._renewWithinMin) {
-  if (!autoSni.httpsOptions) { autoSni.httpsOptions = {}; }
+    throw new Error("options.renewWithin should be at least 3 days");
+  }
+  if (!autoSni.renewBy) { autoSni.renewBy = autoSni.notBefore || defaults.renewBy; }
+  if (autoSni.renewBy < defaults._renewByMin) {
+    throw new Error("options.renewBy should be at least 12 hours");
+  }
+  if (!autoSni.tlsOptions) { autoSni.tlsOptions = autoSni.httpsOptions || {}; }
 
 
 
 
+  autoSni._dropDead = defaults._dropDead;
   //autoSni.renewWithin = autoSni.notBefore;                          // i.e. 15 days
-  autoSni.renewWindow = autoSni.notBefore - autoSni.notAfter;      // i.e. 1 day
+  autoSni._renewWindow = autoSni.renewWithin - autoSni.renewBy;      // i.e. 1 day
-  //autoSni.renewRatio = autoSni.notBefore = autoSni.renewWindow;  // i.e. 1/15 (6.67%)
+  //autoSni.renewRatio = autoSni.notBefore = autoSni._renewWindow;   // i.e. 1/15 (6.67%)
 
 
 
@@ -32,31 +50,32 @@ module.exports.create = function (autoSni) {
 
     // in-process cache
     _ipc: {}
-    // just to account for clock skew
+  , getOptions: function () {
-  , _fiveMin: 5 * MIN
+      return JSON.parse(JSON.stringify(defaults));
+    }
 
 
 
 
     // cache and format incoming certs
-  , _cacheCerts: function (certs) {
+  , cacheCerts: function (certs) {
       var meta = {
         certs: certs
       , tlsContext: 'string' === typeof certs.cert && tls.createSecureContext({
           key: certs.privkey
         , cert: certs.cert + certs.chain
-        , rejectUnauthorized: autoSni.httpsOptions.rejectUnauthorized
+        , rejectUnauthorized: autoSni.tlsOptions.rejectUnauthorized
 
-        , requestCert: autoSni.httpsOptions.requestCert  // request peer verification
+        , requestCert: autoSni.tlsOptions.requestCert  // request peer verification
-        , ca: autoSni.httpsOptions.ca                    // this chain is for incoming peer connctions
+        , ca: autoSni.tlsOptions.ca                    // this chain is for incoming peer connctions
-        , crl: autoSni.httpsOptions.crl                  // this crl is for incoming peer connections
+        , crl: autoSni.tlsOptions.crl                  // this crl is for incoming peer connections
         }) || { '_fake_tls_context_': true }
 
       , subject: certs.subject
         // stagger renewal time by a little bit of randomness
-      , renewAt: (certs.expiresAt - (autoSni.notBefore - (autoSni.renewWindow * Math.random())))
+      , renewAt: (certs.expiresAt - (autoSni.renewWithin - (autoSni._renewWindow * Math.random())))
         // err just barely on the side of safety
-      , expiresNear: certs.expiresAt - autoSni._fiveMin
+      , expiresNear: certs.expiresAt - autoSni._dropDead
       };
       var link = { subject: certs.subject };
 
@@ -99,7 +118,7 @@ module.exports.create = function (autoSni) {
           // give the cert some time (2-5 min) to be validated and replaced before trying again
           certMeta.renewAt = (autoSni._dbg_now || Date.now()) + (2 * MIN) + (3 * MIN * Math.random());
           // let the update happen in the background
-          autoSni.getCertificatesAsync(domain, certMeta.certs).then(autoSni._cacheCerts);
+          autoSni.getCertificatesAsync(domain, certMeta.certs).then(autoSni.cacheCerts);
         }
 
         // return the valid cert right away
@@ -108,7 +127,7 @@ module.exports.create = function (autoSni) {
       }
 
       // promise the non-existent or expired cert
-      promise.then(autoSni._cacheCerts).then(function (certMeta) {
+      promise.then(autoSni.cacheCerts).then(function (certMeta) {
         cb(null, certMeta.tlsContext);
       }, function (err) {
         console.error('ERROR in le-sni-auto:');