From dd9abd974f3e898ef10d4cc51e3bb5b7d1930136 Mon Sep 17 00:00:00 2001
From: Ari Stathopoulos <aristath@gmail.com>
Date: Wed, 21 Sep 2022 14:53:24 +0300
Subject: [PATCH] Add initial PHP implementation & filters for form action &
 method

---
 lib/blocks.php                                |  1 +
 packages/block-library/src/form/block.json    | 12 +++-
 packages/block-library/src/form/index.php     | 72 +++++++++++++++++++
 .../block-library/src/input-field/edit.js     |  1 +
 4 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 packages/block-library/src/form/index.php

diff --git a/lib/blocks.php b/lib/blocks.php
index 842ff6a6ec093..8b008e5a989ff 100644
--- a/lib/blocks.php
+++ b/lib/blocks.php
@@ -65,6 +65,7 @@ function gutenberg_reregister_core_block_types() {
 				'comments-title.php'               => 'core/comments-title',
 				'comments.php'                     => 'core/comments',
 				'file.php'                         => 'core/file',
+				'form.php'                         => 'core/form',
 				'home-link.php'                    => 'core/home-link',
 				'image.php'                        => 'core/image',
 				'gallery.php'                      => 'core/gallery',
diff --git a/packages/block-library/src/form/block.json b/packages/block-library/src/form/block.json
index b9bdd98d5f619..d3562cf72d84a 100644
--- a/packages/block-library/src/form/block.json
+++ b/packages/block-library/src/form/block.json
@@ -6,5 +6,15 @@
 	"category": "common",
 	"description": "A form.",
 	"keywords": [ "container", "wrapper", "row", "section" ],
-	"textdomain": "default"
+	"textdomain": "default",
+	"attributes": {
+		"action": {
+			"type": "string",
+			"default": "#"
+		},
+		"method": {
+			"type": "string",
+			"default": "get"
+		}
+	}
 }
diff --git a/packages/block-library/src/form/index.php b/packages/block-library/src/form/index.php
new file mode 100644
index 0000000000000..b17c6ea50135c
--- /dev/null
+++ b/packages/block-library/src/form/index.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * Server-side rendering of the `core/form` block.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Renders the `core/form` block on server.
+ *
+ * @param array    $attributes The block attributes.
+ * @param string   $content The saved content.
+ * @param WP_Block $block The parsed block.
+ *
+ * @return string The content of the block being rendered.
+ */
+function render_block_core_form( $attributes, $content, $block ) {
+
+	// Build the form action attribute.
+	$action = empty( $attributes['action'] ) ? '' : $attributes['action'];
+	$action = empty( $action ) ? '#' : $action;
+
+	/**
+	 * Filters the form action attribute.
+	 *
+	 * @param string $action The form action attribute.
+	 * @param array  $attributes The block attributes.
+	 * @param string $content The saved content.
+	 * @param WP_Block $block The parsed block.
+	 *
+	 * @return string The form action attribute.
+	 */
+	$action = apply_filters( 'block_form', $action, $attributes, $content, $block );
+
+	// Build the form method attribute.
+	$method = empty( $attributes['method'] ) ? '' : $attributes['method'];
+	$method = empty( $method ) || ( 'get' !== strtolower( $method ) && 'post' !== strtolower( $method ) ) ? 'get' : $method;
+	/**
+	 * Filters the form method attribute.
+	 *
+	 * @param string $method The form method attribute.
+	 * @param array  $attributes The block attributes.
+	 * @param string $content The saved content.
+	 * @param WP_Block $block The parsed block.
+	 *
+	 * @return string The form method attribute.
+	 */
+	$method = apply_filters( 'block_form_method', $method, $attributes, $content, $block );
+
+	return str_replace(
+		'<form ',
+		sprintf(
+			'<form action="%1$s" method="%2$s" ',
+			esc_attr( $action ),
+			esc_attr( $method )
+		),
+		$content
+	);
+}
+
+/**
+ * Registers the `core/form` block on server.
+ */
+function register_block_core_form() {
+	register_block_type_from_metadata(
+		__DIR__ . '/form',
+		array(
+			'render_callback' => 'render_block_core_form',
+		)
+	);
+}
+add_action( 'init', 'register_block_core_form' );
diff --git a/packages/block-library/src/input-field/edit.js b/packages/block-library/src/input-field/edit.js
index f9369888e5405..b3b26a88dfba9 100644
--- a/packages/block-library/src/input-field/edit.js
+++ b/packages/block-library/src/input-field/edit.js
@@ -10,6 +10,7 @@ import {
 import {
 	PanelBody,
 	CustomSelectControl,
+	TextControl,
 	CheckboxControl,
 } from '@wordpress/components';
 import { useRef } from '@wordpress/element';