feat: support Casbin FilteredAdapter interface

src/Adapter.php

@@ -6,19 +6,27 @@
 use Casbin\Model\Model;
 use Casbin\Persist\Adapter as AdapterContract;
 use Casbin\Persist\BatchAdapter as BatchAdapterContract;
+use Casbin\Persist\FilteredAdapter as FilteredAdapterContract;
 use Casbin\Persist\AdapterHelper;
+use Casbin\Persist\Adapters\Filter;
+use Casbin\Exceptions\InvalidFilterTypeException;
 
 /**
  * DatabaseAdapter.
  *
  * @author techlee@qq.com
  */
-class Adapter implements AdapterContract, BatchAdapterContract
+class Adapter implements AdapterContract, BatchAdapterContract, FilteredAdapterContract
 {
     use AdapterHelper;
 
     protected $casbinRule;
 
+    /**
+     * @var bool
+     */
+    private $filtered = false;
+
     public function __construct(CasbinRule $casbinRule)
     {
         $this->casbinRule = $casbinRule;
@@ -181,4 +189,60 @@ public function removeFilteredPolicy(string $sec, string $ptype, int $fieldIndex
 
         $this->casbinRule->deleteAll($where);
     }
+
+    /**
+     * Loads only policy rules that match the filter.
+     *
+     * @param Model $model
+     * @param mixed $filter
+     */
+    public function loadFilteredPolicy(Model $model, $filter): void
+    {
+        $entity = clone $this->casbinRule;
+        $entity = $entity->find();
+
+        if (is_string($filter)) {
+            $entity->where($filter);
+        } elseif ($filter instanceof Filter) {
+            foreach ($filter->p as $k => $v) {
+                $where[$v] = $filter->g[$k];
+                $entity->where([$v => $filter->g[$k]]);
+            }
+        } elseif ($filter instanceof \Closure) {
+            $filter($entity);
+        } else {
+            throw new InvalidFilterTypeException('invalid filter type');
+        }
+
+        $rows = $entity->all();
+        foreach ($rows as $row) {
+            unset($row->id);
+            $row = $row->toArray();
+            $line = implode(', ', array_filter($row, function ($val) {
+                return '' != $val && !is_null($val);
+            }));
+            $this->loadPolicyLine(trim($line), $model);
+        }
+        $this->setFiltered(true);
+    }
+
+    /**
+     * Returns true if the loaded policy has been filtered.
+     *
+     * @return bool
+     */
+    public function isFiltered(): bool
+    {
+        return $this->filtered;
+    }
+
+    /**
+     * Sets filtered parameter.
+     *
+     * @param bool $filtered
+     */
+    public function setFiltered(bool $filtered): void
+    {
+        $this->filtered = $filtered;
+    }
 }

tests/AdapterTest.php

@@ -6,6 +6,9 @@
 use yii\web\Application;
 use Yii;
 use yii\permission\models\CasbinRule;
+use Casbin\Persist\Adapters\Filter;
+use Casbin\Exceptions\InvalidFilterTypeException;
+use yii\db\ActiveQueryInterface;
 
 class AdapterTest extends TestCase
 {
@@ -103,6 +106,48 @@ public function testRemoveFilteredPolicy()
         $this->assertFalse(Yii::$app->permission->enforce('alice', 'data2', 'write'));
     }
 
+    public function testLoadFilteredPolicy()
+    {
+        Yii::$app->permission->clearPolicy();
+        $adapter = Yii::$app->permission->getAdapter();
+        $adapter->setFiltered(true);
+        $this->assertEquals([], Yii::$app->permission->getPolicy());
+
+        // invalid filter type
+        try {
+            $filter = ['alice', 'data1', 'read'];
+            Yii::$app->permission->loadFilteredPolicy($filter);
+            $exception = InvalidFilterTypeException::class;
+            $this->fail("Expected exception $exception not thrown");
+        } catch (InvalidFilterTypeException $exception) {
+            $this->assertEquals("invalid filter type", $exception->getMessage());
+        }
+
+        // string
+        $filter = "v0 = 'bob'";
+        Yii::$app->permission->loadFilteredPolicy($filter);
+        $this->assertEquals([
+            ['bob', 'data2', 'write']
+        ], Yii::$app->permission->getPolicy());
+
+        // Filter
+        $filter = new Filter(['v2'], ['read']);
+        Yii::$app->permission->loadFilteredPolicy($filter);
+        $this->assertEquals([
+            ['alice', 'data1', 'read'],
+            ['data2_admin', 'data2', 'read'],
+        ], Yii::$app->permission->getPolicy());
+
+        // Closure
+        Yii::$app->permission->loadFilteredPolicy(function (ActiveQueryInterface &$entity) {
+            $entity->where(['v1' => 'data1']);
+        });
+
+        $this->assertEquals([
+            ['alice', 'data1', 'read'],
+        ], Yii::$app->permission->getPolicy());
+    }
+
     public function createApplication()
     {
         $config = require __DIR__ . '/../vendor/yiisoft/yii2-app-basic/config/web.php';