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wp-content/plugins/mailchimp-for-wp/includes/forms/class-form-amp.php

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+<?php
+
+/**
+ * Class MC4WP_Form_AMP
+ */
+class MC4WP_Form_AMP {
+
+	/**
+	 * Hook!
+	 */
+	public function add_hooks() {
+		add_filter( 'mc4wp_form_content', array( $this, 'add_response_templates' ), 10, 2 );
+		add_filter( 'mc4wp_form_element_attributes', array( $this, 'add_amp_request' ) );
+		add_filter( 'mc4wp_load_form_scripts', array( $this, 'suppress_scripts' ) );
+	}
+
+	/**
+	 * Add AMP templates for submit/success/error.
+	 *
+	 * @param string     $content The form content.
+	 * @param MC4WP_Form $form The form object.
+	 * @return string    Modified $content.
+	 */
+	public function add_response_templates( $content, $form ) {
+		if ( ! function_exists( 'is_amp_endpoint' ) || ! is_amp_endpoint() ) {
+			return $content;
+		}
+
+		ob_start();
+		?>
+		<div submitting>
+			<template type="amp-mustache">
+				<?php echo esc_html__( 'Submitting...', 'mailchimp-for-wp' ); ?>
+			</template>
+		</div>
+		<div submit-success>
+			<template type="amp-mustache">
+				<?php
+				echo wp_kses(
+					$form->get_message( 'subscribed' ),
+					array(
+					'a' => array(),
+					'strong' => array(),
+					'em' => array(),
+					)
+				);
+				?>
+			</template>
+		</div>
+		<div submit-error>
+			<template type="amp-mustache">
+				{{message}}
+			</template>
+		</div>
+		<?php
+		$content .= ob_get_clean();
+
+		return $content;
+	}
+
+	/**
+	 * Add 'action-xhr' to AMP forms.
+	 *
+	 * @param array $attributes Key-Value pairs of attributes output on form.
+	 * @return array Modified $attributes.
+	 */
+	public function add_amp_request( $attributes ) {
+		if ( function_exists( 'is_amp_endpoint' ) && is_amp_endpoint() ) {
+			$attributes['action-xhr'] = get_rest_url( null, 'mc4wp/v1/form' );
+		}
+
+		return $attributes;
+	}
+
+	/**
+	 * Suppress form scripts on AMP pages.
+	 *
+	 * @param bool $load_scripts Whether scripts should be loaded.
+	 * @return bool Modified $load_scripts.
+	 */
+	public function suppress_scripts( $load_scripts ) {
+		if ( function_exists( 'is_amp_endpoint' ) && is_amp_endpoint() ) {
+			return false;
+		}
+
+		return $load_scripts;
+	}
+}