[TASK] Fixing the validation error since TYPO3 8 and adapations to the new TypoScript config.

Classes/Form/Element/RichTextElement.php

@@ -18,6 +18,7 @@ use SGalinski\Tinymce\Loader;
 use SGalinski\Tinymce4Rte\Extension\Typo3Image;
 use SGalinski\Tinymce4Rte\Extension\Typo3Link;
 use SGalinski\Tinymce4Rte\RteHtmlAreaApi;
+use SGalinski\Tinymce4Rte\Utility\VersionUtility;
 use TYPO3\CMS\Backend\Form\Element\AbstractFormElement;
 use TYPO3\CMS\Backend\Form\InlineStackProcessor;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
@@ -338,6 +339,16 @@ class RichTextElement extends AbstractFormElement {
 
 		$value = $this->transformDatabaseContentToEditor($this->data['parameterArray']['itemFormElValue']);
 
+		// Remove this empty data attribute, otherwise an error will throw in TYPO3 8.7.
+		$validationResults = $this->getValidationDataAsDataAttribute(
+			$this->data['parameterArray']['fieldConf']['config']
+		);
+		if (VersionUtility::isVersion870OrHigher() &&
+			trim($validationResults) === 'data-formengine-validation-rules="[]"'
+		) {
+			$validationResults = '';
+		}
+
 		$result = array();
 		// The hidden field tells the DataHandler that processing should be done on this value.
 		$result[] = '<input type="hidden" name="' . htmlspecialchars($triggerFieldName) . '" value="RTE" />';
@@ -345,7 +356,7 @@ class RichTextElement extends AbstractFormElement {
 //		$result[] =    $this->getLanguageService()->sL('LLL:EXT:tinymce4_rte/Resources/Private/Language/locallang.xlf:Please wait');
 //		$result[] = '</div>';
 		$result[] = '<div id="editorWrap' . $this->domIdentifier . '" class="editorWrap" style="width:' . $editorWrapWidth . '; height:100%;">';
-		$result[] = '<textarea ' . $this->getValidationDataAsDataAttribute($this->data['parameterArray']['fieldConf']['config']) . ' id="RTEarea' . $this->domIdentifier . '" class="tinymce4_rte" name="' . htmlspecialchars($itemFormElementName) . '" rows="0" cols="0" style="' . htmlspecialchars($rteDivStyle) . '">';
+		$result[] = '<textarea ' . $validationResults . ' id="RTEarea' . $this->domIdentifier . '" class="tinymce4_rte" name="' . htmlspecialchars($itemFormElementName) . '" rows="0" cols="0" style="' . htmlspecialchars($rteDivStyle) . '">';
 		$result[] = htmlspecialchars($value);
 		$result[] = '</textarea>';
 		$result[] = '</div>';
@@ -359,7 +370,6 @@ class RichTextElement extends AbstractFormElement {
 	 * @return void
 	 */
 	protected function enableRegisteredPlugins() {
-		// @todo repair this
 		$plugins = [
 			'TYPO3Image' => [
 				'objectReference' => Typo3Image::class,
@@ -592,18 +602,28 @@ class RichTextElement extends AbstractFormElement {
 		/** @var Loader $tinyMCE */
 		$tinyMCE = GeneralUtility::makeInstance(Loader::class);
 		$tinyMCE->loadConfiguration($this->vanillaRteTsConfig['properties']['default.']['tinymceConfiguration']);
-		if ($this->vanillaRteTsConfig['properties']['default.']['contentCSS'] !== '') {
-			$contentCssArray = is_array($this->vanillaRteTsConfig['properties']['default.']['contentCSS.']) ? $this->vanillaRteTsConfig['properties']['default.']['contentCSS.'] : (array)$this->vanillaRteTsConfig['properties']['default.']['contentCSS'];
-			if (!empty($contentCssArray)) {
-				$contentCssFileArray = array();
-				foreach ($contentCssArray as $contentCssKey => $contentCssFile) {
-					$contentCssFileAbs = GeneralUtility::getFileAbsFileName(trim($contentCssFile));
-					if (is_file($contentCssFileAbs)) {
-						$contentCssFileArray[] = GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . PathUtility::stripPathSitePrefix($contentCssFileAbs) . '?' . filemtime($contentCssFileAbs);
-					}
+
+		$contentCssArray = [];
+		if (VersionUtility::isVersion870OrHigher()) {
+			$contentCssArray = is_array($this->vanillaRteTsConfig['properties']['default.']['contentCSS.']) ?
+				$this->vanillaRteTsConfig['properties']['default.']['contentCSS.'] : [];
+		} else {
+			if ($this->vanillaRteTsConfig['properties']['default.']['contentCSS'] !== '') {
+				$contentCssArray = is_array($this->vanillaRteTsConfig['properties']['default.']['contentCSS.']) ?
+					$this->vanillaRteTsConfig['properties']['default.']['contentCSS.'] :
+					(array) $this->vanillaRteTsConfig['properties']['default.']['contentCSS'];
+			}
+		}
+
+		if (!empty($contentCssArray)) {
+			$contentCssFileArray = [];
+			foreach ($contentCssArray as $contentCssKey => $contentCssFile) {
+				$contentCssFileAbs = GeneralUtility::getFileAbsFileName(trim($contentCssFile));
+				if (is_file($contentCssFileAbs)) {
+					$contentCssFileArray[] = GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . PathUtility::stripPathSitePrefix($contentCssFileAbs) . '?' . filemtime($contentCssFileAbs);
 				}
-				$tinyMCE->addConfigurationOption('content_css', implode(',', $contentCssFileArray));
 			}
+			$tinyMCE->addConfigurationOption('content_css', implode(',', $contentCssFileArray));
 		}
 
 		$tinyMCE->addConfigurationOption(