+ * Convert all base64 image data to saved images.
+ */
+ protected function extractBase64ImagesFromHtml(string $htmlText): string
+ {
+ if (empty($htmlText) || !str_contains($htmlText, 'data:image')) {
+ 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.
+ * Regex is used to locate the start of data-uri definitions then
+ * manual looping over content is done to parse the whole data uri.
+ * Attempting to capture the whole data uri using regex can cause PHP
+ * PCRE limits to be hit with larger, multi-MB, files.
+ */
+ protected function extractBase64ImagesFromMarkdown(string $markdown): string
+ {
+ $matches = [];
+ $contentLength = strlen($markdown);
+ $replacements = [];
+ preg_match_all('/!\[.*?]\(.*?(data:image\/.{1,6};base64,)/', $markdown, $matches, PREG_OFFSET_CAPTURE);
+
+ foreach ($matches[1] as $base64MatchPair) {
+ [$dataUri, $index] = $base64MatchPair;
+
+ for ($i = strlen($dataUri) + $index; $i < $contentLength; $i++) {
+ $char = $markdown[$i];
+ if ($char === ')' || $char === ' ' || $char === "\n" || $char === '"') {
+ break;
+ }
+ $dataUri .= $char;
+ }
+
+ $newUrl = $this->base64ImageUriToUploadedImageUrl($dataUri);
+ $replacements[] = [$dataUri, $newUrl];
+ }
+
+ foreach ($replacements as [$dataUri, $newUrl]) {
+ $markdown = str_replace($dataUri, $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.
projects / bookstack / blobdiff