feat: implement quotas

README.md

@@ -359,6 +359,31 @@ if ($capabilities !== null) {
 }
 ```
 
+### Quotas (RFC 9425)
+
+```php
+use JmapClient\Requests\Quota\QuotaGet;
+
+if ($client->sessionCapable('quota')) {
+    $account = $client->sessionAccountDefault('quota');
+    $request = new QuotaGet($account->id());
+
+    foreach ($client->perform([$request])->first()->objects() as $quota) {
+        echo sprintf(
+            "%s: %d of %d %s used\n",
+            $quota->name(),
+            $quota->used(),
+            $quota->hardLimit(),
+            $quota->resource(),
+        );
+    }
+}
+```
+
+The quota extension also supports `QuotaChanges`, `QuotaQuery`, and
+`QuotaQueryChanges`. Query filters cover `name`, `scope`, `resource`, and
+`type`; sorting is available for `name` and `used`.
+
 ### Session Information
 
 ```php

lib/Requests/Quota/QuotaChanges.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestChanges;
+
+class QuotaChanges extends RequestChanges
+{
+    protected string $_space = 'urn:ietf:params:jmap:quota';
+    protected string $_class = 'Quota';
+}

lib/Requests/Quota/QuotaFilter.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestFilter;
+
+class QuotaFilter extends RequestFilter
+{
+    public function name(string $value): static
+    {
+        $this->condition('name', $value);
+
+        return $this;
+    }
+
+    public function scope(string $value): static
+    {
+        $this->condition('scope', $value);
+
+        return $this;
+    }
+
+    public function resource(string $value): static
+    {
+        $this->condition('resourceType', $value);
+
+        return $this;
+    }
+
+    public function type(string $value): static
+    {
+        $this->condition('type', $value);
+
+        return $this;
+    }
+}

lib/Requests/Quota/QuotaGet.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestGet;
+
+class QuotaGet extends RequestGet
+{
+    protected string $_space = 'urn:ietf:params:jmap:quota';
+    protected string $_class = 'Quota';
+}

lib/Requests/Quota/QuotaQuery.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestQuery;
+
+class QuotaQuery extends RequestQuery
+{
+    protected string $_space = 'urn:ietf:params:jmap:quota';
+    protected string $_class = 'Quota';
+    protected string $_filterClass = QuotaFilter::class;
+    protected string $_sortClass = QuotaSort::class;
+
+    public function filter(): QuotaFilter
+    {
+        return parent::filter();
+    }
+
+    public function sort(): QuotaSort
+    {
+        return parent::sort();
+    }
+}

lib/Requests/Quota/QuotaQueryChanges.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestQueryChanges;
+
+class QuotaQueryChanges extends RequestQueryChanges
+{
+    protected string $_space = 'urn:ietf:params:jmap:quota';
+    protected string $_class = 'Quota';
+    protected string $_filterClass = QuotaFilter::class;
+    protected string $_sortClass = QuotaSort::class;
+
+    public function filter(): QuotaFilter
+    {
+        return parent::filter();
+    }
+
+    public function sort(): QuotaSort
+    {
+        return parent::sort();
+    }
+}

lib/Requests/Quota/QuotaSort.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Requests\Quota;
+
+use JmapClient\Requests\RequestSort;
+
+class QuotaSort extends RequestSort
+{
+    public function name(bool $value = true): static
+    {
+        $this->condition('name', $value);
+
+        return $this;
+    }
+
+    public function used(bool $value = true): static
+    {
+        $this->condition('used', $value);
+
+        return $this;
+    }
+}

lib/Responses/Quota/QuotaChanges.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Responses\Quota;
+
+use JmapClient\Responses\ResponseChanges;
+
+class QuotaChanges extends ResponseChanges
+{
+    public function updatedProperties(): array|null
+    {
+        return $this->_response[self::RESPONSE_OBJECT]['updatedProperties'] ?? null;
+    }
+}

lib/Responses/Quota/QuotaGet.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Responses\Quota;
+
+use JmapClient\Responses\ResponseGet;
+
+class QuotaGet extends ResponseGet
+{
+}

lib/Responses/Quota/QuotaParameters.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Responses\Quota;
+
+use JmapClient\Responses\ResponseParameters;
+
+class QuotaParameters extends ResponseParameters
+{
+    public function id(): string|null
+    {
+        return $this->parameter('id');
+    }
+
+    public function resource(): string|null
+    {
+        return $this->parameter('resourceType');
+    }
+
+    public function used(): int|null
+    {
+        return $this->parameter('used');
+    }
+
+    public function warnLimit(): int|null
+    {
+        return $this->parameter('warnLimit');
+    }
+
+    public function softLimit(): int|null
+    {
+        return $this->parameter('softLimit');
+    }
+
+    public function hardLimit(): int|null
+    {
+        return $this->parameter('hardLimit');
+    }
+
+    public function scope(): string|null
+    {
+        return $this->parameter('scope');
+    }
+
+    public function name(): string|null
+    {
+        return $this->parameter('name');
+    }
+
+    public function types(): array|null
+    {
+        return $this->parameter('types');
+    }
+
+    public function description(): string|null
+    {
+        return $this->parameter('description');
+    }
+}

lib/Responses/Quota/QuotaQuery.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Responses\Quota;
+
+use JmapClient\Responses\ResponseQuery;
+
+class QuotaQuery extends ResponseQuery
+{
+}

lib/Responses/Quota/QuotaQueryChanges.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace JmapClient\Responses\Quota;
+
+use JmapClient\Responses\ResponseQueryChanges;
+
+class QuotaQueryChanges extends ResponseQueryChanges
+{
+}

lib/Responses/ResponseClasses.php

@@ -24,6 +24,7 @@ class ResponseClasses
         'AddressBook' => 'JmapClient\Responses\Contacts\AddressBookParameters',
         'ContactCard' => 'JmapClient\Responses\Contacts\ContactParameters',
         'FileNode' => 'JmapClient\Responses\Files\NodeParameters',
+        'Quota' => 'JmapClient\Responses\Quota\QuotaParameters',
     ];
 
     private static array $commands = [
@@ -100,6 +101,11 @@ class ResponseClasses
         'FileNode/changes' => 'JmapClient\Responses\Files\NodeChanges',
         'FileNode/query' => 'JmapClient\Responses\Files\NodeQuery',
         'FileNode/queryChanges' => 'JmapClient\Responses\Files\NodeQueryChanges',
+        // Quota
+        'Quota/get' => 'JmapClient\Responses\Quota\QuotaGet',
+        'Quota/changes' => 'JmapClient\Responses\Quota\QuotaChanges',
+        'Quota/query' => 'JmapClient\Responses\Quota\QuotaQuery',
+        'Quota/queryChanges' => 'JmapClient\Responses\Quota\QuotaQueryChanges',
     ];
 
     public static function listCommand(): array