Fix viewer export (#5713)

frontend/src/core/components/shared/RightRail.tsx

@@ -173,11 +173,14 @@ export default function RightRail() {
     if (currentView === 'pageEditor') {
       return t('rightRail.exportAll', 'Export PDF');
     }
+    if (currentView === 'viewer') {
+      return terminology.download;
+    }
     if (selectedCount > 0) {
       return terminology.downloadSelected;
     }
     return terminology.downloadAll;
-  }, [currentView, selectedCount, t]);
+  }, [currentView, selectedCount, t, terminology]);
 
   return (
     <div ref={sidebarRefs.rightRailRef} className="right-rail" data-sidebar="right-rail">

frontend/src/core/components/viewer/EmbedPdfViewer.tsx

@@ -585,6 +585,11 @@ const EmbedPdfViewerContent = ({
               key={currentFile && isStirlingFile(currentFile) ? currentFile.fileId : (effectiveFile.file instanceof File ? effectiveFile.file.name : effectiveFile.url)}
               file={effectiveFile.file}
               url={effectiveFile.url}
+              fileName={
+                previewFile ? previewFile.name :
+                (currentFile && isStirlingFile(currentFile) ? currentFile.name :
+                (effectiveFile?.file instanceof File ? effectiveFile.file.name : undefined))
+              }
               enableAnnotations={shouldEnableAnnotations}
               showBakedAnnotations={isAnnotationsVisible}
               enableRedaction={shouldEnableRedaction}

frontend/src/core/components/viewer/LocalEmbedPDF.tsx

@@ -60,6 +60,7 @@ const DOCUMENT_NAME = 'stirling-pdf-viewer';
 interface LocalEmbedPDFProps {
   file?: File | Blob;
   url?: string | null;
+  fileName?: string;
   enableAnnotations?: boolean;
   enableRedaction?: boolean;
   isManualRedactionMode?: boolean;
@@ -71,7 +72,7 @@ interface LocalEmbedPDFProps {
   redactionTrackerRef?: React.RefObject<RedactionPendingTrackerAPI>;
 }
 
-export function LocalEmbedPDF({ file, url, enableAnnotations = false, enableRedaction = false, isManualRedactionMode = false, showBakedAnnotations = true, onSignatureAdded, signatureApiRef, annotationApiRef, historyApiRef, redactionTrackerRef }: LocalEmbedPDFProps) {
+export function LocalEmbedPDF({ file, url, fileName, enableAnnotations = false, enableRedaction = false, isManualRedactionMode = false, showBakedAnnotations = true, onSignatureAdded, signatureApiRef, annotationApiRef, historyApiRef, redactionTrackerRef }: LocalEmbedPDFProps) {
   const { t } = useTranslation();
   const [pdfUrl, setPdfUrl] = useState<string | null>(null);
   const [, setAnnotations] = useState<Array<{id: string, pageIndex: number, rect: any}>>([]);
@@ -95,6 +96,17 @@ export function LocalEmbedPDF({ file, url, enableAnnotations = false, enableReda
     const rootFontSize = parseFloat(getComputedStyle(document.documentElement).fontSize);
     const viewportGap = rootFontSize * 3.5;
 
+    // Determine export filename - use provided fileName, or extract from file/url
+    let exportFileName = 'document.pdf';
+    if (fileName) {
+      exportFileName = fileName;
+    } else if (file && 'name' in file) {
+      exportFileName = file.name;
+    } else if (url) {
+      const urlPath = url.split('/').pop() || 'document.pdf';
+      exportFileName = urlPath.split('?')[0]; // Remove query params
+    }
+
     return [
       createPluginRegistration(DocumentManagerPluginPackage, {
         initialDocuments: [{
@@ -177,13 +189,13 @@ export function LocalEmbedPDF({ file, url, enableAnnotations = false, enableReda
 
       // Register export plugin for downloading PDFs
       createPluginRegistration(ExportPluginPackage, {
-        defaultFileName: 'document.pdf',
+        defaultFileName: exportFileName,
       }),
 
       // Register print plugin for printing PDFs
       createPluginRegistration(PrintPluginPackage),
     ];
-  }, [pdfUrl, enableAnnotations, showBakedAnnotations]);
+  }, [pdfUrl, enableAnnotations, showBakedAnnotations, fileName, file, url]);
 
   // Initialize the engine with the React hook - use local WASM for offline support
   const { engine, isLoading, error } = usePdfiumEngine({