make wss CSP headers configurable again

config.js.dist

@@ -25,6 +25,11 @@ module.exports = {
      */
     //websocketPort: 3000,
 
+    /*  If Cryptpad is proxied without using https, the server needs to know.
+     *  Specify 'useSecureWebsockets: true' so that it can send
+     *  Content Security Policy Headers that prevent http and https from mixing
+     */
+     useSecureWebsockets: false,
 
     /*  Cryptpad can log activity to stdout
      *  This may be useful for debugging

server.js

@@ -24,7 +24,7 @@ app.use(function (req, res, next) {
     if (config.websocketPort) {
         host = host.replace(/\:[0-9]+/, ':' + config.websocketPort);
     }
-    var proto = httpsOpts ? 'wss://' : 'ws://';
+    var proto = (httpsOpts || config.useSecureWebsockets) ? 'wss://' : 'ws://';
     res.setHeader('Content-Security-Policy', [
         "default-src 'none'",
         "style-src 'unsafe-inline' 'self'",