WooCommerce REST API (Products) - Get the images for a product or product variation and returns all image sizes.

wc-rest-api-products-images.php

<?php
if ( ! function_exists( 'wc_rest_get_product_images' ) ) {
	add_filter( 'woocommerce_rest_prepare_product_object', 'wc_rest_get_product_images', 10, 2 );

	/**
	 * Get the images for a product or product variation
	 * and returns all image sizes.
	 *
	 * @param WP_REST_Request                 $request Request object.
	 * @param WC_Product|WC_Product_Variation $product Product instance.
	 *
	 * @return WP_REST_Response
	 */
	function wc_rest_get_product_images( $response, $product ) {
		$images           = array();
		$attachment_ids   = array();
		$attachment_sizes = array_merge( get_intermediate_image_sizes(), array( 'full', 'custom' ) );

		// Add featured image.
		if ( $product->get_image_id() ) {
			$attachment_ids[] = $product->get_image_id();
		}

		// Add gallery images.
		$attachment_ids = array_merge( $attachment_ids, $product->get_gallery_image_ids() );

		$attachments = array();

		// Build image data.
		foreach ( $attachment_ids as $position => $attachment_id ) {
			$attachment_post = get_post( $attachment_id );
			if ( is_null( $attachment_post ) ) {
				continue;
			}

			// Get each image size of the attachment.
			foreach ( $attachment_sizes as $size ) {
				$attachments[ $size ] = current( wp_get_attachment_image_src( $attachment_id, $size ) );
			}

			$featured = $position === 0 ? true : false; // phpcs:ignore WordPress.PHP.YodaConditions.NotYoda

			$images[] = array(
				'id'                => (int) $attachment_id,
				'date_created'      => wc_rest_prepare_date_response( $attachment_post->post_date, false ),
				'date_created_gmt'  => wc_rest_prepare_date_response( strtotime( $attachment_post->post_date_gmt ) ),
				'date_modified'     => wc_rest_prepare_date_response( $attachment_post->post_modified, false ),
				'date_modified_gmt' => wc_rest_prepare_date_response( strtotime( $attachment_post->post_modified_gmt ) ),
				'src'               => $attachments,
				'name'              => get_the_title( $attachment_id ),
				'alt'               => get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ),
				'position'          => (int) $position,
				'featured'          => $featured,
			);
		}

		// Set a placeholder image if the product has no images set.
		if ( empty( $images ) ) {
			// Get each image size of the attachment.
			foreach ( $attachment_sizes as $size ) {
				$attachments[ $size ] = current( wp_get_attachment_image_src( get_option( 'woocommerce_placeholder_image', 0 ), $size ) );
			}

			$images[] = array(
				'id'       => 0,
				'date_created'      => wc_rest_prepare_date_response( current_time( 'mysql' ), false ), // Default to now.
				'date_created_gmt'  => wc_rest_prepare_date_response( time() ), // Default to now.
				'date_modified'     => wc_rest_prepare_date_response( current_time( 'mysql' ), false ),
				'date_modified_gmt' => wc_rest_prepare_date_response( time() ),
				'src'               => $attachments,
				'name'              => __( 'Placeholder', 'woosauce' ),
				'alt'               => __( 'Placeholder', 'woosauce' ),
				'position'          => 0,
				'featured'          => true,
			);
		}

		$response->data['images'] = $images;

		return $response;
	} // END wc_rest_get_product_images()
}