Why this is needed?
NW.js uses local
file:// protocol to render pages. Unfortunately, for security reasons Flash Player doesn't like SWFs embedded locally and applies very restrictive policy to them. Such SWF lands in one of two possible local sandboxes, and communication via ExternalInterface is blocked.
Fortunately there is officially supported way of making your local SWF trusted, so previously mentioned restrictions don't apply. Full explanation can be found in Adobe Flash Player Administration Guide.
Long story short: you have to put text file in special directory provided by Flash Player and save to this file paths of SWFs you want to be trusted. This library provides cross-platform API for doing just that.
npm install nw-flash-trust
Usage & API
For simplicity API is fully synchronous. It does a little of I/O, but so little it shouldn't be an issue.
var path = require('path'); var flashTrust = require('nw-flash-trust'); // appName could be any globally unique string containing only // big and small letters, numbers and chars "-._" // It specifies name of file where trusted paths will be stored. // Best practice is to feed it with "name" value from your package.json file. var appName = 'myApp'; // Initialization and parsing config file for given appName (if already exists). var trustManager = flashTrust.initSync(appName); // Alternatively you can provide a custom flash config folder for initialization. // This is useful for example if you use Atom Electron and a PPAPI flash plugin (like Pepper Flash), // as the flash config folder in this case would be in the Atom Electron data path folder. var trustManager = flashTrust.initSync(appName, '/yourApp-data-path/Pepper Data/Shockwave Flash/WritableRoot'); // adds given filepath to trusted locations // paths must be absolute trustManager.add(path.resolve('path-to', 'file.swf')); // whole folders are also allowed trustManager.add(path.resolve('path-to', 'folder')); // removes given path from trusted locations trustManager.remove(path.resolve('path-to', 'file.swf')); // returns true or false whether given path is trusted or not var isTrusted = trustManager.isTrusted(path.resolve('path-to', 'file.swf')); // returns array containing all trusted paths var list = trustManager.list(); // removes all trusted locations from config file trustManager.empty();