Add TLS support

Author: Szymon Mentel

.gitignore

@@ -10,3 +10,4 @@ rel/dobby_allinone/
 rebar
 id_rsa*
 priv/erl_sshd
+priv/erl_cowboy

Makefile

@@ -56,3 +56,6 @@ rebar:
 
 id_rsa:
 	deps/erl_sshd/make_keys
+
+tls:
+	deps/erl_cowboy/make_tls.sh

README.md

@@ -7,17 +7,14 @@ This is an Erlang node that contains:
 3. [dobby_ui_lib](https://github.com/ivanos/dobby_ui_lib)
 3. [erl_sshd](https://github.com/marcsugiyama/erl_sshd)
 
-<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
 **Table of Contents**
 
 - [Dobby All In One](#dobby-all-in-one)
     - [Requirements](#requirements)
     - [Building](#building)
     - [Running](#running)
     - [Connecting via ssh](#connecting-via-ssh)
-
-<!-- markdown-toc end -->
-
+    - [Configuring TLS](#configuring-tls)
 
 ## Requirements
 - Erlang R17+
@@ -61,3 +58,37 @@ ssh 127.0.0.1 -p 11133 -i id_rsa
 ```
 
 To exit the Erlang shell obtained via ssh call `exit().`
+
+## Configuring TLS
+
+To enable TLS support for the HTTP interface you have to configure it in the `erl_cowboy`
+application and provide the following options:
+
+* certificate file name (expected in the `priv/erl_cowboy`)
+* key file name (expected in the `priv/erl_cowboy`)
+* password to the key if it is password protected
+
+The configuration has to be placed in the sys.config file. Below is an example:
+```erlang
+[
+...
+ {erl_cowboy, [
+               {port, 8080},
+               {listeners, 10},
+               {app, 'dobby_allinone'},
+               {tls_enabled, true},
+               {tls_opts, [{certfile, "dummy.crt"},
+                           {keyfile, "dummy.key"},
+                           {password, ""}]}
+               ]},
+...
+]
+```
+
+There is a sample certificate and key generator that you can run with:
+`make tls`.
+The above example config works with the generated files. To test the TLS,
+put the config snippet into the `rel/files/sys.config`. Remember
+to re-generated the release after the change.
+
+With TLS enabled, the Visualizer can be accessed via https://localhost:8080/static/www/index.html.

rel/files/sys.config

@@ -7,12 +7,17 @@
             ]},
  %% erl_mnesia configuration
  {erl_mnesia, [
-             {options, [persistent]}
-            ]},
+               {options, [persistent]}
+              ]},
  %% erl_cowboy configuration
  {erl_cowboy, [
                {port, 8080},
-               {listeners, 10}
+               {listeners, 10},
+               {app, 'dobby_allinone'},
+               {tls_enabled, false}
+               %% ,{tls_opts, [{certfile, "dummy.crt"},
+               %%             {keyfile, "dummy.key"},
+               %%             {password, ""}]}
               ]},
  %% lager configuration
  {lager, [