Add visibility to filters

docs/filtering.md

@@ -21,6 +21,8 @@ GET /users?filter[postCount]=>=10
 GET /users?filter[postCount]=5..15
 ```
 
+## Custom Filters
+
 To define filters with custom logic, or ones that do not correspond to an attribute, use the `filter` method:
 
 ```php
@@ -28,3 +30,12 @@ $type->filter('minPosts', function ($query, $value, Context $context) {
     $query->where('postCount', '>=', $value);
 });
 ```
+
+Just like [fields](visibility.md), filters can be made conditionally `visible` or `hidden`:
+
+```php
+$type->filter('email', $callback)
+    ->visible(function (Context $context) {
+        return $context->getRequest()->getAttribute('isAdmin');
+    });
+```

src/Endpoint/Index.php

@@ -244,7 +244,7 @@ class Index
                 continue;
             }
 
-            if (isset($filters[$name])) {
+            if (isset($filters[$name]) && evaluate($filters[$name]->getVisible(), [$this->context])) {
                 $filters[$name]->getCallback()($query, $value, $context);
                 continue;
             }

src/Schema/Concerns/HasVisibility.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of tobyz/json-api-server.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Tobyz\JsonApiServer\Schema\Concerns;
+
+use function Tobyz\JsonApiServer\negate;
+
+trait HasVisibility
+{
+    private $visible = true;
+
+    /**
+     * Allow this field to be seen.
+     */
+    public function visible(callable $condition = null)
+    {
+        $this->visible = $condition ?: true;
+
+        return $this;
+    }
+
+    /**
+     * Disallow this field to be seen.
+     */
+    public function hidden(callable $condition = null)
+    {
+        $this->visible = $condition ? negate($condition) : false;
+
+        return $this;
+    }
+
+    public function getVisible()
+    {
+        return $this->visible;
+    }
+}

src/Schema/Field.php

@@ -13,6 +13,7 @@ namespace Tobyz\JsonApiServer\Schema;
 
 use Tobyz\JsonApiServer\Schema\Concerns\HasDescription;
 use Tobyz\JsonApiServer\Schema\Concerns\HasListeners;
+use Tobyz\JsonApiServer\Schema\Concerns\HasVisibility;
 use function Tobyz\JsonApiServer\negate;
 use function Tobyz\JsonApiServer\wrap;
 
@@ -20,11 +21,10 @@ abstract class Field
 {
     use HasListeners;
     use HasDescription;
+    use HasVisibility;
 
     private $name;
     private $property;
-    private $visible = true;
-    private $single = false;
     private $writable = false;
     private $writableOnce = false;
     private $getCallback;
@@ -54,26 +54,6 @@ abstract class Field
         return $this;
     }
 
-    /**
-     * Allow this field to be seen.
-     */
-    public function visible(callable $condition = null)
-    {
-        $this->visible = $condition ?: true;
-
-        return $this;
-    }
-
-    /**
-     * Disallow this field to be seen.
-     */
-    public function hidden(callable $condition = null)
-    {
-        $this->visible = $condition ? negate($condition) : false;
-
-        return $this;
-    }
-
     /**
      * Allow this field to be written.
      */
@@ -214,11 +194,6 @@ abstract class Field
         return $this->property;
     }
 
-    public function getVisible()
-    {
-        return $this->visible;
-    }
-
     public function getWritable()
     {
         return $this->writable;

src/Schema/Filter.php

@@ -12,10 +12,12 @@
 namespace Tobyz\JsonApiServer\Schema;
 
 use Tobyz\JsonApiServer\Schema\Concerns\HasDescription;
+use Tobyz\JsonApiServer\Schema\Concerns\HasVisibility;
 
 final class Filter
 {
     use HasDescription;
+    use HasVisibility;
 
     private $name;
     private $callback;