TDP-1887 Provide a default middleware to set the toggle key.

Author: derekrprice

src/FeatureToggleClientProvider.php

@@ -44,16 +44,11 @@ public function register()
      *
      * @return void
      */
-    public function boot(?FeatureToggleClient $client = null, ?Request $request = null)
+    public function boot()
     {
         $this->publishes([
             __DIR__.'/../config/feature-toggle.php' => config_path('feature-toggle.php'),
         ]);
-
-        if ($client) {
-            // The SplitIO SDK doesn't allow empty keys.
-            $client->setKey(optional($request->user())->email ?? "__dummy_key__");
-        }
     }
 
     private static $splitIOFactory;

src/Middleware/SetFeatureToggleKeyFromUserEmail.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace PartechGSS\Laravel\FeatureToggle\Middleware;
+
+use Closure;
+use PartechGSS\Laravel\FeatureToggle\Contracts\FeatureToggleClient;
+
+class SetFeatureToggleKeyFromUserEmail
+{
+    private $featureToggleClient;
+
+    /**
+     * Create a new middleware instance.
+     *
+     * @param  ApiManager  $auth
+     * @return void
+     */
+    public function __construct(FeatureToggleClient $featureToggleClient)
+    {
+        $this->featureToggleClient = $featureToggleClient;
+    }
+
+    /**
+     * Handle an incoming request.  Sets the feature toggle client key to $request->user()->email
+     * when found, and to "__no_user__" otherwise.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        // After authentication, set the feature toggle key to the user's email.
+        $this->featureToggleClient->setKey(optional($request->user())->email ?? "__no_user__");
+
+        return $next($request);
+    }
+}