Implement `--pretend` flag to easily simulate user agent strings, fixes #11

README.md

@@ -35,6 +35,14 @@ Nativefier will intelligently attempt to determine the app name, your OS and pro
 $ nativefier --app-name "Some Awesome App" "http://medium.com"
 ```
 
+Certain websites such as WhatsApp Web might say that your browser is unsupported. To get around this, simply pass in the `--pretend` flag, as such:
+
+```
+$ nativefier --pretend "http://web.whatsapp.com"
+```
+
+This will use a preset user agent string to make the website think you're accessing it from a regular Google Chrome browser.
+
 Other command line options are listed below.
 
 ## Options
@@ -152,6 +160,13 @@ Height of the packaged application, defaults to `800px`.
 
 Set the user agent to run the created app with.
 
+### [pretend]
+```
+-p, --pretend
+```
+
+Uses a preset user agent string for your OS and pretends to be a regular Google Chrome browser.
+
 ## How It Works
 
 A template app with the appropriate event listeners and callbacks set up is included in the `./app` folder. When the `nativefier` command is executed, this folder is copied to a temporary directory with the appropriate parameters in a configuration file, and is packaged into an app with [Electron Packager](https://github.com/maxogden/electron-packager).

src/cli.js

@@ -27,6 +27,7 @@ function main(program) {
                 program.width,
                 program.height,
                 program.userAgent,
+                program.pretend,
                 callback);
         },
 
@@ -62,6 +63,7 @@ if (require.main === module) {
         .option('-w, --width <value>', 'set window width, defaults to 1280px', parseInt)
         .option('-h, --height <value>', 'set window height, defaults to 800px', parseInt)
         .option('-u, --user-agent <value>', 'set the user agent string for the app')
+        .option('-p, --pretend', 'pretends to be a normal chrome browser')
         .parse(process.argv);
 
     if (!process.argv.slice(2).length) {

src/options.js

@@ -23,6 +23,7 @@ function optionsFactory(name,
                         width = 1280,
                         height = 800,
                         userAgent,
+                        pretend,
                         callback) {
 
     targetUrl = normalizeUrl(targetUrl);
@@ -35,6 +36,10 @@ function optionsFactory(name,
         height = 800;
     }
 
+    if (!userAgent && pretend) {
+        userAgent = getFakeUserAgent();
+    }
+
     const options = {
         dir: TEMPLATE_APP_DIR,
 
@@ -121,4 +126,20 @@ function normalizeUrl(testUrl) {
     return normalized;
 }
 
+function getFakeUserAgent() {
+    let userAgent;
+    switch (os.platform()) {
+        case 'darwin':
+            userAgent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.1 Safari/537.36';
+            break;
+        case 'win32':
+            userAgent = 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36';
+            break;
+        case 'linux':
+            userAgent = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36';
+            break;
+    }
+    return userAgent;
+}
+
 export default optionsFactory;