class-gravityview-plugin-hooks-gravity-forms-dropbox.php

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<?php
/**
 * Add Gravity Forms Dropbox compatibility
 *
 * @file      class-gravityview-plugin-hooks-gravity-forms-dropbox.php
 * @package   GravityView
 * @license   GPL2+
 * @author    GravityView <[email protected]>
 * @link      https://gravityview.co
 * @copyright Copyright 2017, Katz Web Services, Inc.
 *
 * @since 1.22.3
 */

/**
 * @since 1.22.3
 */
class GravityView_Plugin_Hooks_Gravity_Forms_Dropbox extends GravityView_Plugin_and_Theme_Hooks {

    /**
     * @var string gf_dropbox() wrapper function only exists in Version 2.x; don't want to support 1.x
     * @since 1.22.3
     */
    protected $function_name = 'gf_dropbox';

    /**
     * @since 1.22.3
     */
    protected function add_hooks() {
        parent::add_hooks();

        add_filter( 'gravityview/fields/fileupload/extension', array( $this, 'filter_file_extension' ) );
        add_filter( 'gravityview/fields/fileupload/file_path', array( $this, 'filter_file_path' ) );
        add_filter( 'gravityview/fields/fileupload/image_atts', array( $this, 'filter_image_atts' ) );
    }

    /**
     * When the image file source includes `?raw=1`, don't validate the source, since we know it's Dropbox or similar.
     *
     * @since 2.14.3
     *
     * @param array{src:string,class:string,alt:string,width:string} $image_atts
     *
     * @return array Image attributes array, possibly with `validate_src` disabled.
     */
    function filter_image_atts( $image_atts = array() ) {

        $image_source = rgar( $image_atts, 'src', '' );

        if ( false === strpos( $image_source, '?raw=1' ) ) {
            return $image_atts;
        }

        // The image source has ?raw=1; don't check for valid image extensions.
        $image_atts['validate_src'] = false;

        return $image_atts;
    }

    /**
     * Convert links to view content on Dropbox.com to direct-access files.
     *
     * @since 1.22.3
     *
     * @param string $string Original string (file path or extension).
     *
     * @return string File path or extension, with Dropbox URLs modified.
     */
    function filter_file_extension( $string = '' ) {

        $extension = str_replace( '?dl=0', '', $string );

        if ( in_array( $extension, GravityView_Image::get_image_extensions(), true ) ) {
            return $extension;
        }

        return $string;
    }

    /**
     * Convert links to view content on Dropbox.com to direct-access files
     *
     * @since 1.22.3
     *
     * @param string $string Original string (file path or extension)
     *
     * @return string File path or extension, with Dropbox URLs modified
     */
    function filter_file_path( $string = '' ) {
        return str_replace( '?dl=0', '?raw=1', $string );
    }
}

new GravityView_Plugin_Hooks_Gravity_Forms_Dropbox;