File types/class-papi-attachment-type.php

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<?php

/**
 * Papi type that handle attachment post type, post data
 * and rendering. All attachment types should extend this
 * class.
 */
class Papi_Attachment_Type extends Papi_Page_Type {

    /**
     * The post type to register the type with.
     *
     * @var string
     */
    public $post_type = 'attachment';

    /**
     * The type name.
     *
     * @var string
     */
    public $type = 'attachment';

    /**
     * Get post type.
     *
     * @return string
     */
    public function get_post_type() {
        return $this->post_type[0];
    }

    /**
     * Setup filters.
     */
    protected function setup_filters() {
        // Don't add any filters on post.php page.
        if ( ! isset( $_GET['post'] ) ) {
            add_filter( 'attachment_fields_to_edit', [$this, 'edit_attachment'], 10, 2 );
            add_filter( 'attachment_fields_to_save', [$this, 'save_attachment'], 10 );
        }
    }

    /**
     * Add attachment fields.
     *
     * @param  array   $form_fields
     * @param  WP_Post $post
     *
     * @return array
     */
    public function edit_attachment( $form_fields, $post ) {
        foreach ( $this->get_boxes() as $box ) {
            if ( ! empty( $box->title ) ) {
                $form_fields['papi-media-title-' . uniqid()] = [
                    'label' => '',
                    'input' => 'html',
                    'html'  => '<h4 class="papi-media-title">' . $box->title . '</h4>'
                ];
            }

            foreach ( $box->properties as $prop ) {
                // Raw output is required.
                $prop->raw = true;

                // Set post id to the property.
                $prop->set_post_id( $post->ID );

                // Add property to form fields.
                $form_fields[$prop->get_slug()] = [
                    'label' => $prop->title,
                    'input' => 'html',
                    'helps' => $prop->description,
                    'html'  => papi_maybe_get_callable_value(
                        'papi_render_property',
                        $prop
                    )
                ];
            }
        }

        // Add nonce field.
        $form_fields['papi_meta_nonce'] = [
            'label' => '',
            'input' => 'html',
            'html'  => sprintf(
                '<input name="papi_meta_nonce" type="hidden" value="%s" />',
                wp_create_nonce( 'papi_save_data' )
            )
        ];

        return $form_fields;
    }

    /**
     * Save attachment post data.
     *
     * @param  array $post
     *
     * @return array
     */
    public function save_attachment( $post ) {
        update_post_meta( $post['ID'], papi_get_page_type_key(), $this->get_id() );

        $handler = new Papi_Admin_Meta_Handler();
        $handler->save_meta_boxes( $post['ID'], $post );

        return $post;
    }

    /**
     * Check if the entry type is a singleton.
     *
     * @return bool
     */
    public function singleton() {
        $key = sprintf( 'entry_type_id.post_type.%s', $this->get_post_type() );

        if ( papi()->exists( $key ) ) {
            return true;
        }

        papi()->singleton( $key, $this->get_id() );

        return false;
    }
}

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