[6.x] Split hasValidSignature method

src/Illuminate/Routing/UrlGenerator.php

@@ -355,19 +355,42 @@ public function temporarySignedRoute($name, $expiration, $parameters = [], $abso
      * @return bool
      */
     public function hasValidSignature(Request $request, $absolute = true)
+    {
+        return $this->hasCorrectSignature($request, $absolute)
+            && $this->signatureHasNotExpired($request);
+    }
+
+    /**
+     * Determine if the signature from the given request matches the URL.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  bool  $absolute
+     * @return bool
+     */
+    public function hasCorrectSignature(Request $request, $absolute = true)
     {
         $url = $absolute ? $request->url() : '/'.$request->path();
 
         $original = rtrim($url.'?'.Arr::query(
             Arr::except($request->query(), 'signature')
         ), '?');
 
-        $expires = $request->query('expires');
-
         $signature = hash_hmac('sha256', $original, call_user_func($this->keyResolver));
 
-        return hash_equals($signature, (string) $request->query('signature', '')) &&
-               ! ($expires && Carbon::now()->getTimestamp() > $expires);
+        return hash_equals($signature, (string) $request->query('signature', ''));
+    }
+
+    /**
+     * Determine if the expires timestamp from the given request is not from the past.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return bool
+     */
+    public function signatureHasNotExpired(Request $request)
+    {
+        $expires = $request->query('expires');
+
+        return ! ($expires && Carbon::now()->getTimestamp() > $expires);
     }
 
     /**