Merge pull request #12 from Valian/extended-regex-support

extended regex support - using ngx.re.match instead of string.match

Author: Valian

README.md

@@ -71,7 +71,7 @@ Available configuration options:
 
  | Variable | Example | Description
  | --- | --- | ---|
- | ALLOWED_DOMAINS | `(www\|api).example.com`, `example.com`, `([a-z]+.)?example.com` | [lua pattern](http://lua-users.org/wiki/PatternsTutorial) of allowed domains. Internally, we're using `string.match`. By default we accept all domains | 
+ | ALLOWED_DOMAINS | `(www\|api).example.com`, `example.com`, `([a-z]+.)?example.com` | Regex pattern of allowed domains. Internally, we're using [ngx.re.match](https://github.com/openresty/lua-nginx-module#ngxrematch). By default we accept all domains |
  | DIFFIE_HELLMAN | `true` | Force regeneration of `dhparam.pem`. If not specified, default one is used. |
  | SITES | `db.com=localhost:5432; *.app.com=localhost:8080`, `_=localhost:8080` | Shortcut for defining multiple proxies, in form of `domain1=endpoint1; domain2=endpoint2`. Default template for proxy is [here](https://github.com/Valian/docker-nginx-auto-ssl/blob/master/snippets/server-proxy.conf). Name `_` means default server, just like in nginx configuration |
  | FORCE_HTTPS | `true`, `false` | If `true`, automatically adds location to `resty-server-http.conf` redirecting traffic from http to https. `true` by default. |

snippets/resty-http.conf

@@ -24,7 +24,7 @@ init_by_lua_block {
     -- and register new certificates for. Defaults to not allowing any domains,
     -- so this must be configured.
     auto_ssl:set("allow_domain", function(domain)
-      return string.match(domain, '$ALLOWED_DOMAINS')
+      return ngx.re.match(domain, '$ALLOWED_DOMAINS', 'ijo')
     end)
 
     auto_ssl:init()