update guide

MIGRATION_GUIDE_V2_V3.md

@@ -6,7 +6,29 @@ All options described for `Greenlock.create({...})` also apply to the Greenlock
 
 # Overview of Major Differences
 
-## Greenlock JavaScript API greatly reduced
+-   Reduced API
+-   No code in the config
+    -   (config is completely serializable)
+-   Manager callbacks replace `approveDomains`
+-   Greenlock Express does more, with less config
+    -   cluster is supported out-of-the-box
+    -   high-performance
+    -   scalable
+-   ACME challenges are simplified
+    -   init
+    -   zones (dns-01)
+    -   set
+    -   get
+    -   remove
+-   Store callbacks are simplified
+    -   accounts
+        -   checkKeypairs
+    -   certificates
+        -   checkKeypairs
+        -   check
+        -   set
+
+# Greenlock JavaScript API greatly reduced
 
 Whereas before there were many different methods with nuance differences,
 now there's just `create`, `get`, `renew`, and sometimes `add` ().
@@ -18,6 +40,9 @@ now there's just `create`, `get`, `renew`, and sometimes `add` ().
     -   (retrieves, issues, renews, all-in-one)
 -   _optional_ Greenlock.add({ subject, altnames, subscriberEmail })
     -   (partially replaces `approveDomains`)
+
+Also, some disambiguation on terms:
+
 -   `domains` was often ambiguous and confusing, it has been replaced by:
     -   `subject` refers to the subject of a certificate - the primary domain
     -   `altnames` refers to the domains in the SAN (Subject Alternative Names) section of the certificate
@@ -40,7 +65,7 @@ var greenlock = Greenlock.create({
 
     // used as the contact for critical bug and security notices
     // should be the same as pkg.author.email
-        maintainerEmail: 'jon@example.com'
+    maintainerEmail: 'jon@example.com',
 
     // used for logging background events and errors
     notify: function(ev, args) {
@@ -130,27 +155,38 @@ with a few extra that are specific to Greenlock Express:
 ```js
 require('@root/greenlock-express')
     .init(function() {
-		return {
+        // This object will be passed to Greenlock.create()
+
+        var options = {
+            // some options, like cluster, are special to Greenlock Express
+
             cluster: false,
+
+            // The rest are the same as for Greenlock
+
             packageAgent: pkg.name + '/' + pkg.version,
             maintainerEmail: 'jon@example.com',
             notify: function(ev, args) {
-				if ('error' === ev || 'warning' === ev) {
-					console.error(ev, args);
-					return;
-				}
                 console.info(ev, args);
             }
         };
+
+        return options;
     })
     .serve(function(glx) {
+        // will start servers on port 80 and 443
+
         glx.serveApp(function(req, res) {
             res.end('Hello, Encrypted World!');
         });
+
+        // you can get access to the raw server (i.e. for websockets)
+
+        glx.httpsServer(); // returns raw server object
     });
 ```
 
-## _Manager_ replaces `approveDomains`
+# _Manager_ replaces `approveDomains`
 
 `approveDomains` was always a little confusing. Most people didn't need it.
 
@@ -178,24 +214,7 @@ The config file should look something like this:
 }
 ```
 
-You can specify a `acme-dns-01-*` or `acme-http-01-*` challenge plugin globally, or per-site. The same is true with `greenlock-store-*` plugins:
+You can specify a `acme-dns-01-*` or `acme-http-01-*` challenge plugin globally, or per-site.
-
-```json
-{
-	"subscriberEmail": "jon@example.com",
-	"agreeToTerms": true,
-	"sites": {
-		"example.com": {
-			"subject": "example.com",
-			"altnames": ["example.com", "www.example.com"]
-		}
-	},
-	"store": {
-		"module": "greenlock-store-fs",
-		"basePath": "~/.config/greenlock"
-	}
-}
-```
 
 ```json
 {
@@ -216,7 +235,26 @@ You can specify a `acme-dns-01-*` or `acme-http-01-*` challenge plugin globally,
 }
 ```
 
-### Customer Manager
+The same is true with `greenlock-store-*` plugins:
+
+```json
+{
+    "subscriberEmail": "jon@example.com",
+    "agreeToTerms": true,
+    "sites": {
+        "example.com": {
+            "subject": "example.com",
+            "altnames": ["example.com", "www.example.com"]
+        }
+    },
+    "store": {
+        "module": "greenlock-store-fs",
+        "basePath": "~/.config/greenlock"
+    }
+}
+```
+
+### Customer Manager, the lazy way
 
 At the very least you have to implement `find({ servername })`.
 
@@ -254,7 +292,9 @@ If you want to use wildcards or local domains, you must specify the `dns-01` cha
 
 ```js
 function find(options) {
-	var servername = options.servername; // www.example.com
+    var subject = options.subject;
+    // may include wildcard
+    var altnames = options.altnames;
     var wildname = options.wildname; // *.example.com
     return Promise.resolve([
         {
@@ -268,6 +308,85 @@ function find(options) {
 }
 ```
 
+### Customer Manager, complete
+
+To use a fully custom manager, you give the npm package name, or absolute path to the file to load
+
+```js
+Greenlock.create({
+    // Greenlock Options
+    maintainerEmail: 'jon@example.com',
+    packageAgent: 'my-package/v2.1.1',
+    notify: notify,
+
+    // file path or npm package name
+    manager: '/path/to/manager.js',
+    // options that get passed to the manager
+    myFooOption: 'whatever'
+});
+```
+
+The manager itself is, again relatively simple:
+
+-   find(options)
+-   add(siteConfig)
+-   update(updates)
+-   remove(options)
+-   defaults(globalOptions) (as setter)
+-   defaults() => globalOptions (as getter)
+
+`/path/to/manager.js`:
+
+```js
+'use strict';
+
+module.exports.create = function() {
+    var manager = {};
+
+    manager.find = async function({ subject, altnames, renewBefore }) {
+        if (subject) {
+            return getSiteConfigBySubject(subject);
+        }
+
+        if (altnames) {
+            // may include wildcards
+            return getSiteConfigByAnyAltname(altnames);
+        }
+
+        if (renewBefore) {
+            return getSiteConfigsWhereRenewAtIsLessThan(renewBefore);
+        }
+
+        return [];
+    };
+
+    manage.add = function({ subject, altnames }) {
+        return setSiteConfig(subject, { subject, altnames });
+    };
+
+    manage.update = function({ subject, renewAt }) {
+        // update the `renewAt` date of the site by `subject`
+        return mergSiteConfig(subject, { renewAt });
+    };
+
+    manage.remove = function({ subject, altname }) {
+        if (subject) {
+            return removeSiteConfig(subject);
+        }
+
+        return removeFromSiteConfigAndResetRenewAtToZero(altname);
+    };
+
+    // set the global config
+    manage.defaults = function(options) {
+        if (!options) {
+            return getGlobalConfig();
+        }
+        return mergeGlobalConfig(options);
+    };
+};
+```
+
 # ACME Challenge Plugins
 
 The ACME challenge plugins are just a few simple callbacks:
@@ -309,40 +428,46 @@ If you are just implenting in-house and are not going to publish a module, you c
 `/path/to/project/my-hacky-store.js`:
 
 ```js
+'use strict';
+
 module.exports.create = function(options) {
     // ex: /path/to/account.ecdsa.jwk.json
     var accountJwk = require(options.accountJwkPath);
     // ex: /path/to/privkey.rsa.pem
     var serverPem = fs.readFileSync(options.serverPemPath, 'ascii');
-	var store = {};
+    var accounts = {};
+    var certificates = {};
+    var store = { accounts, certificates };
 
     // bare essential account callbacks
-	store.accounts = {
+    accounts.checkKeypair = function() {
-		checkKeypair: function() {
         // ignore all options and just return a single, global keypair
+
         return Promise.resolve({
             privateKeyJwk: accountJwk
         });
-		},
+    };
-		setKeypair: function() {
+    accounts.setKeypair = function() {
         // this will never get called if checkKeypair always returns
+
         return Promise.resolve({});
-		}
     };
 
     // bare essential cert and key callbacks
-	store.certificates = {
+    certificates.checkKeypair = function() {
-		checkKeypair: function() {
         // ignore all options and just return a global server keypair
+
         return {
             privateKeyPem: serverPem
         };
-		},
+    };
-		setKeypair: function() {
+    certificates.setKeypair = function() {
         // never gets called if checkKeypair always returns an existing key
+
         return Promise.resolve(null);
-		},
+    };
-		check: function(args) {
+
+    certificates.check = function(args) {
         var subject = args.subject;
         // make a database call or whatever to get a certificate
         return goGetCertBySubject(subject).then(function() {
@@ -353,8 +478,8 @@ module.exports.create = function(options) {
                 }
             };
         });
-		},
+    };
-		set: function(args) {
+    certificates.set = function(args) {
         var subject = args.subject;
         var cert = args.pems.cert;
         var chain = args.pems.chain;
@@ -365,7 +490,6 @@ module.exports.create = function(options) {
             cert,
             chain
         });
-		}
     };
 };
 ```