Add the ability to append and prepend middleware priority from the application builder

src/Illuminate/Foundation/Configuration/ApplicationBuilder.php

@@ -269,6 +269,18 @@ public function withMiddleware(?callable $callback = null)
             if ($priorities = $middleware->getMiddlewarePriority()) {
                 $kernel->setMiddlewarePriority($priorities);
             }
+
+            if ($priorityAppends = $middleware->getMiddlewarePriorityAppends()) {
+                foreach ($priorityAppends as $middleware => $after) {
+                    $kernel->addToMiddlewarePriorityAfter($after, $middleware);
+                }
+            }
+
+            if ($priorityPrepends = $middleware->getMiddlewarePriorityPrepends()) {
+                foreach ($priorityPrepends as $middleware => $before) {
+                    $kernel->addToMiddlewarePriorityBefore($before, $middleware);
+                }
+            }
         });
 
         return $this;

src/Illuminate/Foundation/Configuration/Middleware.php

@@ -145,6 +145,20 @@ class Middleware
      */
     protected $priority = [];
 
+    /**
+     * The middleware to prepend to the middleware priority definition.
+     *
+     * @var array
+     */
+    protected $prependPriority = [];
+
+    /**
+     * The middleware to append to the middleware priority definition.
+     *
+     * @var array
+     */
+    protected $appendPriority = [];
+
     /**
      * Prepend middleware to the application's global middleware stack.
      *
@@ -400,6 +414,34 @@ public function priority(array $priority)
         return $this;
     }
 
+    /**
+     * Prepend middleware to the priority middleware.
+     *
+     * @param  array|string  $before
+     * @param  string  $prepend
+     * @return $this
+     */
+    public function prependToPriorityList($before, $prepend)
+    {
+        $this->prependPriority[$prepend] = $before;
+
+        return $this;
+    }
+
+    /**
+     * Append middleware to the priority middleware.
+     *
+     * @param  array|string  $after
+     * @param  string  $append
+     * @return $this
+     */
+    public function appendToPriorityList($after, $append)
+    {
+        $this->appendPriority[$append] = $after;
+
+        return $this;
+    }
+
     /**
      * Get the global middleware.
      *
@@ -766,4 +808,24 @@ public function getMiddlewarePriority()
     {
         return $this->priority;
     }
+
+    /**
+     * Get the middleware to prepend to the middleware priority definition.
+     *
+     * @return array
+     */
+    public function getMiddlewarePriorityPrepends()
+    {
+        return $this->prependPriority;
+    }
+
+    /**
+     * Get the middleware to append to the middleware priority definition.
+     *
+     * @return array
+     */
+    public function getMiddlewarePriorityAppends()
+    {
+        return $this->appendPriority;
+    }
 }