SoftReferenceHook.php

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<?php
namespace TYPO3\CMS\Rtehtmlarea\Hook;

class SoftReferenceHook extends \TYPO3\CMS\Core\Database\SoftReferenceIndex {

    // Token prefix
    public $tokenID_basePrefix = '';

    public function findRef($table, $field, $uid, $content, $spKey, $spParams, $structurePath = '') {
        $retVal = FALSE;
        $this->tokenID_basePrefix = $table . ':' . $uid . ':' . $field . ':' . $structurePath . ':' . $spKey;
        switch ($spKey) {
            case 'rtehtmlarea_images':
                $retVal = $this->findRef_rtehtmlarea_images($content, $spParams);
                break;
            default:
                $retVal = FALSE;
        }
        return $retVal;
    }

    public function findRef_rtehtmlarea_images($content, $spParams) {
        $retVal = FALSE;
        // Start HTML parser and split content by image tag
        $htmlParser = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Html\\HtmlParser');
        $imgTags = $htmlParser->splitTags('img', $content);
        $elements = array();
        // Traverse splitted parts
        foreach ($imgTags as $k => $v) {
            if ($k % 2) {
                // Get FAL uid reference
                $attribs = $htmlParser->get_tag_attributes($v);
                $fileUid = $attribs[0]['data-htmlarea-file-uid'];
                $fileTable = $attribs[0]['data-htmlarea-file-table'];
                // If there is a file uid, continue. Otherwise ignore this img tag.
                if ($fileUid) {
                    // Initialize the element entry with info text here
                    $tokenID = $this->makeTokenID($k);
                    $elements[$k] = array();
                    $elements[$k]['matchString'] = $v;
                    // Token and substitute value
                    $imgTags[$k] = str_replace('data-htmlarea-file-uid="' . $fileUid . '"', 'data-htmlarea-file-uid="{softref:' . $tokenID . '}"', $imgTags[$k]);
                    $elements[$k]['subst'] = array(
                        'type' => 'db',
                        'recordRef' => ($fileTable ?: 'sys_file') . ':' . $fileUid,
                        'tokenID' => $tokenID,
                        'tokenValue' => $fileUid
                    );
                }
            }
        }
        // Assemble result array
        if (count($elements)) {
            $retVal = array(
                'content' => implode('', $imgTags),
                'elements' => $elements
            );
        }
        return $retVal;
    }

}