Merge pull request #485

docs/includes/apiargs-MongoDBClient-method-listDatabases-option.yaml

+arg_name: option
+name: filter
+type: array|object
+description: |
+  A query expression to filter the list of databases.
+
+  You can specify a query expression for database fields (e.g. ``name``,
+  ``sizeOnDisk``, ``empty``).
+
+  .. versionadded:: 1.3
+interface: phpmethod
+operation: ~
+optional: true
+---
 source:
   file: apiargs-common-option.yaml
   ref: maxTimeMS

docs/includes/apiargs-MongoDBDatabase-method-listCollections-option.yaml

@@ -4,7 +4,12 @@ type: array|object
 description: |
   A query expression to filter the list of collections.
 
-  You can specify a query expression on the collection ``name`` and ``options``.
+  You can specify a query expression for collection fields (e.g. ``name``,
+  ``options``).
+
+  For server versions < 3.0, the filter can only be used to match the ``name``
+  field with a string value. More complex filters will result in an exception at
+  execution time if used.
 interface: phpmethod
 operation: ~
 optional: true

src/Operation/ListCollections.php

@@ -49,6 +49,10 @@ class ListCollections implements Executable
      *
      *  * filter (document): Query by which to filter collections.
      *
+     *    For server versions < 3.0, the filter can only be used to match the
+     *    "name" field with a string value. More complex filters will result in
+     *    an exception at execution time if used.
+     *
      *  * maxTimeMS (integer): The maximum amount of time to allow the query to
      *    run.
      *

src/Operation/ListDatabases.php

@@ -42,6 +42,10 @@ class ListDatabases implements Executable
      *
      * Supported options:
      *
+     *  * filter (document): Query by which to filter databases.
+     *
+     *    For servers < 3.6, this option is ignored.
+     *
      *  * maxTimeMS (integer): The maximum amount of time to allow the query to
      *    run.
      *
@@ -54,6 +58,10 @@ class ListDatabases implements Executable
      */
     public function __construct(array $options = [])
     {
+        if (isset($options['filter']) && ! is_array($options['filter']) && ! is_object($options['filter'])) {
+            throw InvalidArgumentException::invalidType('"filter" option', $options['filter'], 'array or object');
+        }
+
         if (isset($options['maxTimeMS']) && ! is_integer($options['maxTimeMS'])) {
             throw InvalidArgumentException::invalidType('"maxTimeMS" option', $options['maxTimeMS'], 'integer');
         }
@@ -78,6 +86,10 @@ class ListDatabases implements Executable
     {
         $cmd = ['listDatabases' => 1];
 
+        if ( ! empty($this->options['filter'])) {
+            $cmd['filter'] = (object) $this->options['filter'];
+        }
+
         if (isset($this->options['maxTimeMS'])) {
             $cmd['maxTimeMS'] = $this->options['maxTimeMS'];
         }

tests/Operation/ListDatabasesFunctionalTest.php

@@ -2,12 +2,56 @@
 
 namespace MongoDB\Tests\Operation;
 
+use MongoDB\Operation\InsertOne;
 use MongoDB\Operation\ListDatabases;
 use MongoDB\Tests\CommandObserver;
 use stdClass;
 
 class ListDatabasesFunctionalTest extends FunctionalTestCase
 {
+    public function testListDatabases()
+    {
+        $server = $this->getPrimaryServer();
+
+        $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
+        $writeResult = $insertOne->execute($server);
+        $this->assertEquals(1, $writeResult->getInsertedCount());
+
+        $operation = new ListDatabases();
+        $databases = $operation->execute($server);
+
+        $this->assertInstanceOf('MongoDB\Model\DatabaseInfoIterator', $databases);
+
+        foreach ($databases as $database) {
+            $this->assertInstanceOf('MongoDB\Model\DatabaseInfo', $database);
+        }
+    }
+
+    public function testFilterOption()
+    {
+        if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
+            $this->markTestSkipped('listDatabase command "filter" option is not supported');
+        }
+
+        $server = $this->getPrimaryServer();
+
+        $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
+        $writeResult = $insertOne->execute($server);
+        $this->assertEquals(1, $writeResult->getInsertedCount());
+
+        $operation = new ListDatabases(['filter' => ['name' => $this->getDatabaseName()]]);
+        $databases = $operation->execute($server);
+
+        $this->assertInstanceOf('MongoDB\Model\DatabaseInfoIterator', $databases);
+
+        $this->assertCount(1, $databases);
+
+        foreach ($databases as $database) {
+            $this->assertInstanceOf('MongoDB\Model\DatabaseInfo', $database);
+            $this->assertEquals($this->getDatabaseName(), $database->getName());
+        }
+    }
+
     public function testSessionOption()
     {
         if (version_compare($this->getServerVersion(), '3.6.0', '<')) {

tests/Operation/ListDatabasesTest.php

@@ -19,6 +19,10 @@ class ListDatabasesTest extends TestCase
     {
         $options = [];
 
+        foreach ($this->getInvalidDocumentValues() as $value) {
+            $options[][] = ['filter' => $value];
+        }
+
         foreach ($this->getInvalidIntegerValues() as $value) {
             $options[][] = ['maxTimeMS' => $value];
         }