If the BBB URL has a protocol, use it when making API calls

When configuring a BigBlueButton server with HTTPS, it wasn't using HTTPS
in the API calls.
Even if the server returned a redirect on HTTP calls they would not work,
since curl is not configured to follow redirects. So all API calls would
fail.

plugin/bbb/lib/bbb.lib.php

@@ -125,13 +125,15 @@ class bbb
                 $urlWithProtocol = $bbb_host;
             } else {
                 // We assume it's an http, if user wants to use https, the host *must* include the protocol.
-                $urlWithProtocol = 'http://'.$bbb_host;
+                $this->protocol = 'http://';
+                $urlWithProtocol = $this->protocol.$bbb_host;
             }
 
             // Setting BBB api
             define('CONFIG_SECURITY_SALT', $this->salt);
             define('CONFIG_SERVER_URL_WITH_PROTOCOL', $urlWithProtocol);
             define('CONFIG_SERVER_BASE_URL', $this->url);
+            define('CONFIG_SERVER_PROTOCOL', $this->protocol);
 
             $this->api = new BigBlueButtonBN();
             $this->pluginEnabled = true;

plugin/bbb/lib/bbb_api.php

@@ -41,6 +41,7 @@ class BigBlueButtonBN
 {
 	private $_securitySalt;
 	private $_bbbServerBaseUrl;
+	private $_bbbServerProtocol;
 
 	public function __construct()
     {
@@ -51,6 +52,7 @@ class BigBlueButtonBN
 		// simply flow in here via the constants:
 		$this->_securitySalt 		= CONFIG_SECURITY_SALT;
 		$this->_bbbServerBaseUrl 	= CONFIG_SERVER_BASE_URL;
+		$this->_bbbServerProtocol 	= CONFIG_SERVER_PROTOCOL;
 	}
 
 	private function _processXmlResponse($url)
@@ -62,7 +64,7 @@ class BigBlueButtonBN
 			$ch = curl_init() or die ( curl_error($ch) );
 			$timeout = 10;
 			curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false);
-			curl_setopt( $ch, CURLOPT_URL, $url );
+			curl_setopt( $ch, CURLOPT_URL, $this->_bbbServerProtocol.$url );
 			curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
 			curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, $timeout);
             // Following redirect required to use Scalelite, BBB's Load Balancer