From 5460e0df1e9a8fabecb44cf162478c70efa44ce1 Mon Sep 17 00:00:00 2001
From: Timothy Jacobs <timothyblynjacobs@git.wordpress.org>
Date: Sun, 3 May 2020 22:56:01 +0000
Subject: [PATCH] REST API: Accept POST requests in the block renderer
 endpoint.

Rendering a block is idempotent, so a GET is the most natural request method. However, the maximum length of URLs prevented blocks with large attributes from being rendered.

Props ryankienstra.
Fixes #49680.


git-svn-id: https://develop.svn.wordpress.org/trunk@47756 602fd350-edb4-49c9-b593-d223f7449a82
---
 ...lass-wp-rest-block-renderer-controller.php |  2 +-
 .../rest-block-renderer-controller.php        | 21 ++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
index 94d349a1ba..3bdcae5435 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
@@ -52,7 +52,7 @@ class WP_REST_Block_Renderer_Controller extends WP_REST_Controller {
 						),
 					),
 					array(
-						'methods'             => WP_REST_Server::READABLE,
+						'methods'             => array( WP_REST_Server::READABLE, WP_REST_Server::CREATABLE ),
 						'callback'            => array( $this, 'get_item' ),
 						'permission_callback' => array( $this, 'get_item_permissions_check' ),
 						'args'                => array(
diff --git a/tests/phpunit/tests/rest-api/rest-block-renderer-controller.php b/tests/phpunit/tests/rest-api/rest-block-renderer-controller.php
index cf41f079a0..88b1b69bde 100644
--- a/tests/phpunit/tests/rest-api/rest-block-renderer-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-block-renderer-controller.php
@@ -455,6 +455,25 @@ class REST_Block_Renderer_Controller_Test extends WP_Test_REST_Controller_Testca
 		$this->assertEquals( $expected_title, $data['rendered'] );
 	}
 
+	/**
+	 * Test a POST request, with the attributes in the body.
+	 *
+	 * @ticket 49680
+	 */
+	public function test_get_item_post_request() {
+		wp_set_current_user( self::$user_id );
+		$string_attribute = 'Lorem ipsum dolor';
+		$attributes       = array( 'some_string' => $string_attribute );
+		$request          = new WP_REST_Request( 'POST', self::$rest_api_route . self::$block_name );
+		$request->set_param( 'context', 'edit' );
+		$request->set_header( 'content-type', 'application/json' );
+		$request->set_body( wp_json_encode( compact( 'attributes' ) ) );
+		$response = rest_get_server()->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+		$this->assertContains( $string_attribute, $response->get_data()['rendered'] );
+	}
+
 	/**
 	 * Test getting item with invalid post ID.
 	 *
@@ -503,7 +522,7 @@ class REST_Block_Renderer_Controller_Test extends WP_Test_REST_Controller_Testca
 		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
-		$this->assertEqualSets( array( 'GET' ), $data['endpoints'][0]['methods'] );
+		$this->assertEqualSets( array( 'GET', 'POST' ), $data['endpoints'][0]['methods'] );
 		$this->assertEqualSets(
 			array( 'name', 'context', 'attributes', 'post_id' ),
 			array_keys( $data['endpoints'][0]['args'] )