<?php
namespace Classifai\Features;
use Classifai\Providers\Azure\ComputerVision;
use Classifai\Services\ImageProcessing;
use WP_REST_Server;
use WP_REST_Request;
use WP_Error;
use function Classifai\clean_input;
/**
* Class ImageCropping
*/
class ImageCropping extends Feature {
/**
* ID of the current feature.
*
* @var string
*/
const ID = 'feature_image_cropping';
/**
* WP_Filesystem_Base instance.
*
* @since 1.5.0
*
* @var WP_Filesystem_Base
*/
private $wp_filesystem;
/**
* Constructor.
*/
public function __construct() {
$this->label = __( 'Image Cropping', 'classifai' );
// Contains all providers that are registered to the service.
$this->provider_instances = $this->get_provider_instances( ImageProcessing::get_service_providers() );
// Contains just the providers this feature supports.
$this->supported_providers = [
ComputerVision::ID => __( 'Microsoft Azure AI Vision', 'classifai' ),
];
}
/**
* Set up necessary hooks.
*
* We utilize this so we can register the REST route.
*/
public function setup() {
parent::setup();
add_action( 'rest_api_init', [ $this, 'register_endpoints' ] );
}
/**
* Set up necessary hooks.
*/
public function feature_setup() {
add_action( 'add_meta_boxes_attachment', [ $this, 'setup_attachment_meta_box' ] );
add_action( 'edit_attachment', [ $this, 'maybe_crop_image' ] );
add_filter( 'attachment_fields_to_edit', [ $this, 'add_rescan_button_to_media_modal' ], 10, 2 );
add_filter( 'wp_generate_attachment_metadata', [ $this, 'generate_smart_crops' ], 7, 2 );
}
/**
* Register any needed endpoints.
*/
public function register_endpoints() {
register_rest_route(
'classifai/v1',
'smart-crop/(?P<id>\d+)',
[
'methods' => WP_REST_Server::READABLE,
'callback' => [ $this, 'rest_endpoint_callback' ],
'args' => [
'id' => [
'required' => true,
'type' => 'integer',
'sanitize_callback' => 'absint',
'description' => esc_html__( 'Image ID to generate smart crop.', 'classifai' ),
],
],
'permission_callback' => [ $this, 'smart_crop_permissions_check' ],
]
);
}
/**
* Check if a given request has access to generate smart crops.
*
* @param WP_REST_Request $request Request object.
* @return bool|WP_Error
*/
public function smart_crop_permissions_check( WP_REST_Request $request ) {
$attachment_id = $request->get_param( 'id' );
$post_type = get_post_type_object( 'attachment' );
// Ensure attachments are allowed in REST endpoints.
if ( empty( $post_type ) || empty( $post_type->show_in_rest ) ) {
return false;
}
// Ensure we have a logged in user that can upload and change files.
if ( empty( $attachment_id ) || ! current_user_can( 'edit_post', $attachment_id ) || ! current_user_can( 'upload_files' ) ) {
return false;
}
if ( ! $this->is_feature_enabled() ) {
return new WP_Error( 'not_enabled', esc_html__( 'Smart cropping is disabled. Please check your settings.', 'classifai' ) );
}
return true;
}
/**
* Generic request handler for all our custom routes.
*
* @param WP_REST_Request $request The full request object.
* @return \WP_REST_Response
*/
public function rest_endpoint_callback( WP_REST_Request $request ) {
$route = $request->get_route();
if ( strpos( $route, '/classifai/v1/smart-crop' ) === 0 ) {
$result = $this->run( $request->get_param( 'id' ), 'crop' );
if ( ! empty( $result ) && ! is_wp_error( $result ) ) {
$meta = $this->save( $result, $request->get_param( 'id' ) );
wp_update_attachment_metadata( $request->get_param( 'id' ), $meta );
}
return rest_ensure_response( $result );
}
return parent::rest_endpoint_callback( $request );
}
/**
* Generate smart cropped thumbnails for the image being uploaded.
*
* @param array $metadata The metadata for the image.
* @param int $attachment_id Post ID for the attachment.
* @return array
*/
public function generate_smart_crops( array $metadata, int $attachment_id ): array {
if ( ! $this->is_feature_enabled() ) {
return $metadata;
}
$result = $this->run( $attachment_id, 'crop', $metadata );
if ( ! empty( $result ) && ! is_wp_error( $result ) ) {
$metadata = $this->save( $result, $attachment_id );
}
return $metadata;
}
/**
* Save the cropped images.
*
* @param array $result The results to save.
* @param int $attachment_id The attachment ID.
* @return array
*/
public function save( array $result, int $attachment_id ): array {
$metadata = wp_get_attachment_metadata( $attachment_id );
foreach ( $result as $size => $image ) {
if ( is_wp_error( $image['data'] ) || empty( $image['data'] ) ) {
continue;
}
$attached_file = get_attached_file( $attachment_id );
$file_path_info = pathinfo( $attached_file );
$new_thumb_file_name = str_replace(
$file_path_info['filename'],
sprintf(
'%s-%dx%d',
$file_path_info['filename'],
$image['width'],
$image['height']
),
$attached_file
);
/**
* Filters the file name of the smart-cropped image.
*
* By default, the filename mirrors what is generated by
* core -- e.g., my-thumb-150x150.jpg -- so will override the
* core-generated image. Apply this filter to keep the original
* file in the file system.
*
* @since 1.5.0
* @hook classifai_smart_cropping_thumb_file_name
*
* @param {string} Default file name.
* @param {int} The ID of the attachment being processed.
* @param {array} Width and height data for the image.
*
* @return {string} Filtered file name.
*/
$new_thumb_file_name = apply_filters(
'classifai_smart_cropping_thumb_file_name',
$new_thumb_file_name,
$attachment_id,
[
'width' => $image['width'],
'height' => $image['height'],
]
);
$filesystem = $this->get_wp_filesystem();
if ( $filesystem && $filesystem->put_contents( $new_thumb_file_name, $image['data'] ) ) {
$metadata['sizes'][ $size ]['file'] = basename( $new_thumb_file_name );
}
}
return $metadata;
}
/**
* Adds a meta box for rescanning options if the settings are configured.
*
* @param \WP_Post $post The post object.
*/
public function setup_attachment_meta_box( \WP_Post $post ) {
global $wp_meta_boxes;
if ( ! wp_attachment_is_image( $post ) || ! $this->is_feature_enabled() ) {
return;
}
// Add our content to the metabox.
add_action( 'classifai_render_attachment_metabox', [ $this, 'attachment_data_meta_box_content' ] );
// If the metabox was already registered, don't add it again.
if ( isset( $wp_meta_boxes['attachment']['side']['high']['classifai_image_processing'] ) ) {
return;
}
// Register the metabox if needed.
add_meta_box(
'classifai_image_processing',
__( 'ClassifAI Image Processing', 'classifai' ),
[ $this, 'attachment_data_meta_box' ],
'attachment',
'side',
'high'
);
}
/**
* Render the meta box.
*
* @param \WP_Post $post The post object.
*/
public function attachment_data_meta_box( \WP_Post $post ) {
/**
* Allows more fields to be rendered in attachment metabox.
*
* @since 3.0.0
* @hook classifai_render_attachment_metabox
*
* @param {WP_Post} $post The post object.
* @param {object} $this The Provider object.
*/
do_action( 'classifai_render_attachment_metabox', $post, $this );
}
/**
* Display meta data.
*/
public function attachment_data_meta_box_content() {
$smart_crop = get_transient( 'classifai_azure_computer_vision_image_cropping_latest_response' ) ? __( 'Regenerate smart thumbnail', 'classifai' ) : __( 'Create smart thumbnail', 'classifai' );
?>
<?php if ( $this->is_feature_enabled() ) : ?>
<div class="misc-pub-section">
<label for="rescan-smart-crop">
<input type="checkbox" value="yes" id="rescan-smart-crop" name="rescan-smart-crop"/>
<?php echo esc_html( $smart_crop ); ?>
</label>
</div>
<?php
endif;
}
/**
* Determine if we need to crop the image.
*
* @param int $attachment_id Attachment ID.
*/
public function maybe_crop_image( int $attachment_id ) {
if ( clean_input( 'rescan-smart-crop' ) ) {
$result = $this->run( $attachment_id, 'crop' );
if ( ! empty( $result ) && ! is_wp_error( $result ) ) {
$meta = $this->save( $result, $attachment_id );
wp_update_attachment_metadata( $attachment_id, $meta );
}
}
}
/**
* Adds the rescan buttons to the media modal.
*
* @param array $form_fields Array of fields
* @param \WP_Post $post Post object for the attachment being viewed.
* @return array
*/
public function add_rescan_button_to_media_modal( array $form_fields, \WP_Post $post ): array {
if ( ! $this->is_feature_enabled() || ! wp_attachment_is_image( $post ) ) {
return $form_fields;
}
$smart_crop_text = empty( get_transient( 'classifai_azure_computer_vision_image_cropping_latest_response' ) ) ? __( 'Generate', 'classifai' ) : __( 'Regenerate', 'classifai' );
$form_fields['rescan_smart_crop'] = [
'label' => __( 'Smart thumbnail', 'classifai' ),
'input' => 'html',
'show_in_edit' => false,
'html' => '<button class="button secondary" id="classifai-rescan-smart-crop" data-id="' . esc_attr( absint( $post->ID ) ) . '">' . esc_html( $smart_crop_text ) . '</button><span class="spinner" style="display:none;float:none;"></span><span class="error" style="display:none;color:#bc0b0b;padding:5px;"></span>',
];
return $form_fields;
}
/**
* Get the description for the enable field.
*
* @return string
*/
public function get_enable_description(): string {
return esc_html__( 'AI Vision detects and saves the most visually interesting part of your image (i.e., faces, animals, notable text).', 'classifai' );
}
/**
* Returns the default settings for the feature.
*
* @return array
*/
public function get_feature_default_settings(): array {
return [
'provider' => ComputerVision::ID,
];
}
/**
* Provides the global WP_Filesystem_Base class instance.
*
* @return WP_Filesystem_Base
*/
public function get_wp_filesystem() {
global $wp_filesystem;
if ( is_null( $this->wp_filesystem ) ) {
if ( ! $wp_filesystem ) {
WP_Filesystem(); // Initiates the global.
}
$this->wp_filesystem = $wp_filesystem;
}
/**
* Filters the filesystem class instance used to save image files.
*
* @since 1.5.0
* @hook classifai_smart_crop_wp_filesystem
*
* @param {WP_Filesystem_Base} $this->wp_filesystem Filesystem class for saving images.
*
* @return {WP_Filesystem_Base} Filtered Filesystem class.
*/
return apply_filters( 'classifai_smart_crop_wp_filesystem', $this->wp_filesystem );
}
/**
* Generates feature setting data required for migration from
* ClassifAI < 3.0.0 to 3.0.0
*
* @return array
*/
public function migrate_settings() {
$old_settings = get_option( 'classifai_computer_vision', array() );
$new_settings = $this->get_default_settings();
$new_settings['provider'] = 'ms_computer_vision';
if ( isset( $old_settings['enable_smart_cropping'] ) ) {
$new_settings['status'] = $old_settings['enable_smart_cropping'];
}
if ( isset( $old_settings['url'] ) ) {
$new_settings['ms_computer_vision']['endpoint_url'] = $old_settings['url'];
}
if ( isset( $old_settings['api_key'] ) ) {
$new_settings['ms_computer_vision']['api_key'] = $old_settings['api_key'];
}
if ( isset( $old_settings['authenticated'] ) ) {
$new_settings['ms_computer_vision']['authenticated'] = $old_settings['authenticated'];
}
if ( isset( $old_settings['smart_cropping_roles'] ) ) {
$new_settings['roles'] = $old_settings['smart_cropping_roles'];
}
if ( isset( $old_settings['smart_cropping_users'] ) ) {
$new_settings['users'] = $old_settings['smart_cropping_users'];
}
if ( isset( $old_settings['smart_cropping_user_based_opt_out'] ) ) {
$new_settings['user_based_opt_out'] = $old_settings['smart_cropping_user_based_opt_out'];
}
return $new_settings;
}
}