[8.x] Validated subsets (#38366)

* conditional rules

* simplify some code

* allow closures on conditional

* Apply fixes from StyleCI

* fix type hint

* onlyValidated and exceptValidated

* change approach

* Apply fixes from StyleCI

* magic methods

* Update src/Illuminate/Support/ValidatedInput.php

Co-authored-by: Mior Muhammad Zaki <crynobone@gmail.com>

* Apply fixes from StyleCI

* use validator method

* add test case

Co-authored-by: Taylor Otwell <taylorotwell@users.noreply.github.com>
Co-authored-by: Mior Muhammad Zaki <crynobone@gmail.com>

src/Illuminate/Contracts/Support/ValidatedData.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Illuminate\Contracts\Support;
+
+use ArrayAccess;
+use IteratorAggregate;
+
+interface ValidatedData extends Arrayable, ArrayAccess, IteratorAggregate
+{
+    //
+}

src/Illuminate/Foundation/Http/FormRequest.php

@@ -185,6 +185,16 @@ protected function failedAuthorization()
         throw new AuthorizationException;
     }
 
+    /**
+     * Get a validated input container for the validated input.
+     *
+     * @return \Illuminate\Support\ValidatedInput
+     */
+    public function safe()
+    {
+        return $this->validator->safe();
+    }
+
     /**
      * Get the validated data from the request.
      *

src/Illuminate/Support/ValidatedInput.php

@@ -0,0 +1,208 @@
+<?php
+
+namespace Illuminate\Support;
+
+use ArrayIterator;
+use Illuminate\Contracts\Support\ValidatedData;
+use stdClass;
+
+class ValidatedInput implements ValidatedData
+{
+    /**
+     * The underlying input.
+     *
+     * @var array
+     */
+    protected $input;
+
+    /**
+     * Create a new validated input container.
+     *
+     * @param  array  $input
+     * @return void
+     */
+    public function __construct(array $input)
+    {
+        $this->input = $input;
+    }
+
+    /**
+     * Get a subset containing the provided keys with values from the input data.
+     *
+     * @param  array|mixed  $keys
+     * @return array
+     */
+    public function only($keys)
+    {
+        $results = [];
+
+        $input = $this->input;
+
+        $placeholder = new stdClass;
+
+        foreach (is_array($keys) ? $keys : func_get_args() as $key) {
+            $value = data_get($input, $key, $placeholder);
+
+            if ($value !== $placeholder) {
+                Arr::set($results, $key, $value);
+            }
+        }
+
+        return $results;
+    }
+
+    /**
+     * Get all of the input except for a specified array of items.
+     *
+     * @param  array|mixed  $keys
+     * @return array
+     */
+    public function except($keys)
+    {
+        $keys = is_array($keys) ? $keys : func_get_args();
+
+        $results = $this->input;
+
+        Arr::forget($results, $keys);
+
+        return $results;
+    }
+
+    /**
+     * Get the input as a collection.
+     *
+     * @return \Illuminate\Support\Collection
+     */
+    public function collect()
+    {
+        return new Collection($this->input);
+    }
+
+    /**
+     * Get the raw, underlying input array.
+     *
+     * @return array
+     */
+    public function all()
+    {
+        return $this->input;
+    }
+
+    /**
+     * Get the instance as an array.
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        return $this->all();
+    }
+
+    /**
+     * Dynamically access input data.
+     *
+     * @param  string  $name
+     * @return mixed
+     */
+    public function __get($name)
+    {
+        return $this->input[$name];
+    }
+
+    /**
+     * Dynamically set input data.
+     *
+     * @param  string  $name
+     * @param  mixed  $value
+     * @return mixed
+     */
+    public function __set($name, $value)
+    {
+        $this->input[$name] = $value;
+    }
+
+    /**
+     * Determine if an input key is set.
+     *
+     * @return bool
+     */
+    public function __isset($name)
+    {
+        return isset($this->input[$name]);
+    }
+
+    /**
+     * Remove an input key.
+     *
+     * @param  string  $name
+     * @return void
+     */
+    public function __unset($name)
+    {
+        unset($this->input[$name]);
+    }
+
+    /**
+     * Determine if an item exists at an offset.
+     *
+     * @param  mixed  $key
+     * @return bool
+     */
+    #[\ReturnTypeWillChange]
+    public function offsetExists($key)
+    {
+        return isset($this->input[$key]);
+    }
+
+    /**
+     * Get an item at a given offset.
+     *
+     * @param  mixed  $key
+     * @return mixed
+     */
+    #[\ReturnTypeWillChange]
+    public function offsetGet($key)
+    {
+        return $this->input[$key];
+    }
+
+    /**
+     * Set the item at a given offset.
+     *
+     * @param  mixed  $key
+     * @param  mixed  $value
+     * @return void
+     */
+    #[\ReturnTypeWillChange]
+    public function offsetSet($key, $value)
+    {
+        if (is_null($key)) {
+            $this->input[] = $value;
+        } else {
+            $this->input[$key] = $value;
+        }
+    }
+
+    /**
+     * Unset the item at a given offset.
+     *
+     * @param  string  $key
+     * @return void
+     */
+    #[\ReturnTypeWillChange]
+    public function offsetUnset($key)
+    {
+        unset($this->input[$key]);
+    }
+
+    /**
+     * Get an iterator for the input.
+     *
+     * @return \ArrayIterator
+     */
+    #[\ReturnTypeWillChange]
+    public function getIterator()
+    {
+        return new ArrayIterator($this->input);
+    }
+}

src/Illuminate/Validation/Validator.php

@@ -14,6 +14,7 @@
 use Illuminate\Support\Fluent;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\Str;
+use Illuminate\Support\ValidatedInput;
 use RuntimeException;
 use stdClass;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -500,6 +501,16 @@ public function validateWithBag(string $errorBag)
         }
     }
 
+    /**
+     * Get a validated input container for the validated input.
+     *
+     * @return \Illuminate\Support\ValidatedInput
+     */
+    public function safe()
+    {
+        return new ValidatedInput($this->validated());
+    }
+
     /**
      * Get the attributes and values that were validated.
      *

tests/Support/ValidatedInputTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Illuminate\Tests\Support;
+
+use Illuminate\Support\ValidatedInput;
+use PHPUnit\Framework\TestCase;
+
+class ValidatedInputTest extends TestCase
+{
+    public function test_can_access_input()
+    {
+        $input = new ValidatedInput(['name' => 'Taylor', 'votes' => 100]);
+
+        $this->assertEquals('Taylor', $input->name);
+        $this->assertEquals('Taylor', $input['name']);
+        $this->assertEquals(['name' => 'Taylor'], $input->only(['name']));
+        $this->assertEquals(['name' => 'Taylor'], $input->except(['votes']));
+        $this->assertEquals(['name' => 'Taylor', 'votes' => 100], $input->all());
+    }
+}