+ /**
+ * Convert all base64 image data to saved images.
+ */
+ protected function extractBase64ImagesFromHtml(string $htmlText): string
+ {
+ if (empty($htmlText) || strpos($htmlText, 'data:image') === false) {
+ return $htmlText;
+ }
+
+ $doc = $this->loadDocumentFromHtml($htmlText);
+ $container = $doc->documentElement;
+ $body = $container->childNodes->item(0);
+ $childNodes = $body->childNodes;
+ $xPath = new DOMXPath($doc);
+
+ // Get all img elements with image data blobs
+ $imageNodes = $xPath->query('//img[contains(@src, \'data:image\')]');
+ foreach ($imageNodes as $imageNode) {
+ $imageSrc = $imageNode->getAttribute('src');
+ $newUrl = $this->base64ImageUriToUploadedImageUrl($imageSrc);
+ $imageNode->setAttribute('src', $newUrl);
+ }
+
+ // Generate inner html as a string
+ $html = '';
+ foreach ($childNodes as $childNode) {
+ $html .= $doc->saveHTML($childNode);
+ }
+
+ return $html;
+ }
+
+ /**
+ * Convert all inline base64 content to uploaded image files.
+ */
+ protected function extractBase64ImagesFromMarkdown(string $markdown)
+ {
+ $matches = [];
+ preg_match_all('/!\[.*?]\(.*?(data:image\/.*?)[)"\s]/', $markdown, $matches);
+
+ foreach ($matches[1] as $base64Match) {
+ $newUrl = $this->base64ImageUriToUploadedImageUrl($base64Match);
+ $markdown = str_replace($base64Match, $newUrl, $markdown);
+ }
+
+ return $markdown;
+ }
+
+ /**
+ * Parse the given base64 image URI and return the URL to the created image instance.
+ * Returns an empty string if the parsed URI is invalid or causes an error upon upload.
+ */
+ protected function base64ImageUriToUploadedImageUrl(string $uri): string
+ {
+ $imageRepo = app()->make(ImageRepo::class);
+ $imageInfo = $this->parseBase64ImageUri($uri);
+
+ // Validate extension and content
+ if (empty($imageInfo['data']) || !ImageService::isExtensionSupported($imageInfo['extension'])) {
+ return '';
+ }
+
+ // Validate that the content is not over our upload limit
+ $uploadLimitBytes = (config('app.upload_limit') * 1000000);
+ if (strlen($imageInfo['data']) > $uploadLimitBytes) {
+ return '';
+ }
+
+ // Save image from data with a random name
+ $imageName = 'embedded-image-' . Str::random(8) . '.' . $imageInfo['extension'];
+
+ try {
+ $image = $imageRepo->saveNewFromData($imageName, $imageInfo['data'], 'gallery', $this->page->id);
+ } catch (ImageUploadException $exception) {
+ return '';
+ }
+
+ return $image->url;
+ }
+
+ /**
+ * Parse a base64 image URI into the data and extension.
+ *
+ * @return array{extension: string, data: string}
+ */
+ protected function parseBase64ImageUri(string $uri): array
+ {
+ [$dataDefinition, $base64ImageData] = explode(',', $uri, 2);
+ $extension = strtolower(preg_split('/[\/;]/', $dataDefinition)[1] ?? '');
+
+ return [
+ 'extension' => $extension,
+ 'data' => base64_decode($base64ImageData) ?: '',
+ ];
+ }
+
projects / bookstack / blobdiff