feat: add featured image caption block

includes/class-blocks.php

@@ -33,6 +33,7 @@ public static function init() {
 		if ( wp_is_block_theme() ) {
 			require_once NEWSPACK_ABSPATH . 'src/blocks/avatar/class-avatar-block.php';
 			require_once NEWSPACK_ABSPATH . 'src/blocks/byline/class-byline-block.php';
+			require_once NEWSPACK_ABSPATH . 'src/blocks/featured-image-caption/class-featured-image-caption-block.php';
 			require_once NEWSPACK_ABSPATH . 'src/blocks/author-profile-social/class-author-profile-social-block.php';
 			require_once NEWSPACK_ABSPATH . 'src/blocks/author-social-link/class-author-social-link-block.php';
 			require_once NEWSPACK_ABSPATH . 'src/blocks/copyright-date/class-copyright-date-block.php';

src/blocks/featured-image-caption/block.json

@@ -0,0 +1,45 @@
+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 3,
+	"name": "newspack/featured-image-caption",
+	"title": "Featured Image Caption",
+	"category": "newspack",
+	"textdomain": "newspack-plugin",
+	"attributes": {
+		"customCaption": {
+			"type": "string",
+			"default": ""
+		}
+	},
+	"usesContext": [ "postId", "postType" ],
+	"supports": {
+		"html": false,
+		"color": {
+			"gradients": true,
+			"__experimentalDefaultControls": {
+				"background": true,
+				"text": true,
+				"link": true
+			}
+		},
+		"spacing": {
+			"margin": true,
+			"padding": true
+		},
+		"typography": {
+			"fontSize": true,
+			"lineHeight": true,
+			"textAlign": true,
+			"__experimentalFontFamily": true,
+			"__experimentalFontWeight": true,
+			"__experimentalFontStyle": true,
+			"__experimentalTextTransform": true,
+			"__experimentalTextDecoration": true,
+			"__experimentalLetterSpacing": true,
+			"__experimentalDefaultControls": {
+				"fontSize": true,
+				"fontAppearance": true
+			}
+		}
+	}
+}

src/blocks/featured-image-caption/class-featured-image-caption-block.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * Featured Image Caption Block.
+ *
+ * @package Newspack
+ */
+
+namespace Newspack\Blocks\FeaturedImageCaption;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Featured Image Caption Block class.
+ */
+final class Featured_Image_Caption_Block {
+
+	/**
+	 * Initializer.
+	 */
+	public static function init() {
+		\add_action( 'init', [ __CLASS__, 'register_block' ] );
+	}
+
+	/**
+	 * Register the block.
+	 */
+	public static function register_block() {
+		register_block_type_from_metadata(
+			__DIR__ . '/block.json',
+			[
+				'render_callback' => [ __CLASS__, 'render_block' ],
+			]
+		);
+	}
+
+	/**
+	 * Block render callback.
+	 *
+	 * @param array     $attributes Block attributes.
+	 * @param string    $content Block content.
+	 * @param \WP_Block $block Block instance.
+	 * @return string Rendered block.
+	 */
+	public static function render_block( $attributes, $content, $block ) {
+		$post_id = ! empty( $block->context['postId'] ) ? $block->context['postId'] : get_the_ID();
+		if ( ! $post_id ) {
+			return '';
+		}
+
+		$featured_image_id = get_post_thumbnail_id( $post_id );
+		if ( ! $featured_image_id ) {
+			return '';
+		}
+
+		$custom_caption = $attributes['customCaption'] ?? '';
+
+		if ( $custom_caption ) {
+			$output = wp_kses_post( $custom_caption );
+		} else {
+			$caption = wp_kses_post( wp_get_attachment_caption( $featured_image_id ) );
+			$credit  = '';
+
+			if ( class_exists( '\Newspack\Newspack_Image_Credits' ) ) {
+				$credit = \Newspack\Newspack_Image_Credits::get_media_credit_string( $featured_image_id );
+			}
+
+			$output = trim( $caption );
+			if ( $output && $credit ) {
+				$output .= ' ' . $credit;
+			} elseif ( $credit ) {
+				$output = $credit;
+			}
+		}
+
+		if ( ! $output ) {
+			return '';
+		}
+
+		$wrapper_attributes = get_block_wrapper_attributes();
+		return sprintf( '<figcaption %1$s>%2$s</figcaption>', $wrapper_attributes, $output );
+	}
+}
+Featured_Image_Caption_Block::init();

src/blocks/featured-image-caption/edit.js

@@ -0,0 +1,73 @@
+import { useBlockProps, RichText } from '@wordpress/block-editor';
+import { useEntityProp } from '@wordpress/core-data';
+import { useSelect } from '@wordpress/data';
+import { __, sprintf } from '@wordpress/i18n';
+
+/**
+ * Generates the credit text for the media credit and organization.
+ *
+ * @param {string} mediaCredit  The media credit.
+ * @param {string} organization The organization associated with the media credit. Optional.
+ *
+ * @return {string} The formatted credit text.
+ */
+const generateCreditText = ( mediaCredit, organization ) => {
+	if ( mediaCredit && organization ) {
+		return sprintf(
+			/* translators: 1: media credit, 2: organization */
+			__( 'Credit: %1$s / %2$s', 'newspack-plugin' ),
+			mediaCredit,
+			organization
+		);
+	}
+
+	return sprintf(
+		/* translators: %s: media credit */
+		__( 'Credit: %s', 'newspack-plugin' ),
+		mediaCredit
+	);
+};
+
+export const Edit = ( { attributes, setAttributes, context: { postType, postId } } ) => {
+	const blockProps = useBlockProps();
+
+	const [ featuredImage ] = useEntityProp( 'postType', postType, 'featured_media', postId );
+
+	const { caption, credit } = useSelect(
+		select => {
+			if ( ! featuredImage ) {
+				return {};
+			}
+			const media = select( 'core' ).getMedia( featuredImage );
+			if ( ! media ) {
+				return {};
+			}
+			return {
+				caption: media.caption?.raw || '',
+				credit: media.meta?._media_credit ? generateCreditText( media.meta._media_credit, media.meta?._navis_media_credit_org ) : '',
+			};
+		},
+		[ featuredImage ]
+	);
+
+	const defaultText = [ caption, credit ].filter( Boolean ).join( ' ' );
+
+	if ( ! featuredImage ) {
+		return (
+			<figcaption { ...blockProps }>
+				<span className="featured-image-caption-placeholder">{ __( 'Featured image caption.', 'newspack-plugin' ) }</span>
+			</figcaption>
+		);
+	}
+
+	return (
+		<RichText
+			{ ...blockProps }
+			tagName="figcaption"
+			value={ attributes.customCaption }
+			onChange={ val => setAttributes( { customCaption: val } ) }
+			placeholder={ defaultText || __( 'Write caption…', 'newspack-plugin' ) }
+			allowedFormats={ [ 'core/bold', 'core/italic', 'core/link' ] }
+		/>
+	);
+};

src/blocks/featured-image-caption/index.js

@@ -0,0 +1,35 @@
+/**
+ * WordPress dependencies
+ */
+import { __ } from '@wordpress/i18n';
+import { caption as icon } from '@wordpress/icons';
+
+/**
+ * Internal dependencies
+ */
+import metadata from './block.json';
+import { Edit } from './edit';
+import colors from '../../../packages/colors/colors.module.scss';
+import './style.scss';
+
+export const title = __( 'Featured Image Caption', 'newspack-plugin' );
+
+const { name } = metadata;
+
+export { metadata, name };
+
+export const settings = {
+	title,
+	icon: {
+		src: icon,
+		foreground: colors[ 'primary-400' ],
+	},
+	keywords: [
+		__( 'caption', 'newspack-plugin' ),
+		__( 'featured image', 'newspack-plugin' ),
+		__( 'credit', 'newspack-plugin' ),
+		__( 'newspack', 'newspack-plugin' ),
+	],
+	description: __( 'Display the featured image caption and credit.', 'newspack-plugin' ),
+	edit: Edit,
+};

src/blocks/featured-image-caption/style.scss

@@ -0,0 +1,5 @@
+.wp-block-newspack-featured-image-caption {
+	.featured-image-caption-placeholder {
+		opacity: 0.6;
+	}
+}

src/blocks/index.js

@@ -14,6 +14,7 @@ import * as correctionBox from './correction-box';
 import * as correctionItem from './correction-item';
 import * as avatar from './avatar';
 import * as byline from './byline';
+import * as featuredImageCaption from './featured-image-caption';
 import * as authorProfileSocial from './author-profile-social';
 import * as authorSocialLink from './author-social-link';
 import * as collections from './collections';
@@ -33,6 +34,7 @@ export const blocks = [
 	correctionItem,
 	avatar,
 	byline,
+	featuredImageCaption,
 	authorProfileSocial,
 	authorSocialLink,
 	collections,
@@ -51,6 +53,7 @@ const blockThemeBlocks = [
 	'newspack/avatar',
 	'newspack/byline',
 	'newspack/copyright-date',
+	'newspack/featured-image-caption',
 	'newspack/my-account-button',
 ];