Make client secret optional, depending on grant type.

lib/swagger-oauth.js

@@ -185,7 +185,7 @@ function initOAuth(opts) {
   popupMask = (o.popupMask||$('#api-common-mask'));
   popupDialog = (o.popupDialog||$('.api-popup-dialog'));
   clientId = (o.clientId||errors.push('missing client id'));
-  clientSecret = (o.clientSecret||errors.push('missing client secret'));
+  clientSecret = (o.clientSecret||null);
   realm = (o.realm||errors.push('missing realm'));
 
   if(errors.length > 0){
@@ -208,11 +208,15 @@ function initOAuth(opts) {
 window.processOAuthCode = function processOAuthCode(data) {
   var params = {
     'client_id': clientId,
-    'client_secret': clientSecret,
     'code': data.code,
     'grant_type': 'authorization_code',
     'redirect_uri': redirect_uri
+  };
+
+  if (clientSecret) {
+    params.client_secret = clientSecret;
   }
+
   $.ajax(
   {
     url : window.swaggerUi.tokenUrl,
@@ -227,7 +231,7 @@ window.processOAuthCode = function processOAuthCode(data) {
       onOAuthComplete("");
     }
   });
-}
+};
 
 window.onOAuthComplete = function onOAuthComplete(token) {
   if(token) {
@@ -284,4 +288,4 @@ window.onOAuthComplete = function onOAuthComplete(token) {
       }
     }
   }
-}
+};