feature #3819: Add ssl proxy url to the onegate con

(cherry picked from commit 88d4825be2d48feebb210a4323e523490f0cee67)

src/onegate/etc/onegate-server.conf

@@ -27,6 +27,9 @@
 :host: 127.0.0.1
 :port: 5030
 
+# SSL proxy URL that serves the API (set if is being used)
+#:ssl_server: https://service.endpoint.fqdn:port/
+
 ################################################################################
 # Log
 ################################################################################

src/onegate/onegate-server.rb

@@ -242,10 +242,13 @@ get '/' do
     client = authenticate(request.env, params)
     halt 401, "Not authorized" if client.nil?
 
-    protocol = request.env["rack.url_scheme"]
-    host     = request.env["HTTP_HOST"]
-
-    base_uri = "#{protocol}://#{host}"
+    if $conf[:ssl_server]
+        base_uri = $conf[:ssl_server]
+    else
+        protocol = request.env["rack.url_scheme"]
+        host     = request.env["HTTP_HOST"]
+        base_uri = "#{protocol}://#{host}"
+    end
 
     response = {
         "vm_info"      => "#{base_uri}/vm",