feat: add button to fetch metadata from book file in metadata editor (#2739)

booklore-api/src/main/java/org/booklore/controller/BookController.java

@@ -120,6 +120,14 @@ public class BookController {
         return ResponseEntity.ok(bookMetadataService.getComicInfoMetadata(bookId));
     }
 
+    @Operation(summary = "Get file metadata", description = "Extract embedded metadata from the book file.")
+    @ApiResponse(responseCode = "200", description = "File metadata returned successfully")
+    @GetMapping("/{bookId}/file-metadata")
+    public ResponseEntity<?> getFileMetadata(
+            @Parameter(description = "ID of the book") @PathVariable long bookId) {
+        return ResponseEntity.ok(bookMetadataService.getFileMetadata(bookId));
+    }
+
     @Operation(summary = "Get book content", description = "Retrieve the binary content of a book for reading. Supports HTTP Range requests for partial content streaming.")
     @ApiResponses({
             @ApiResponse(responseCode = "200", description = "Full book content returned"),

booklore-api/src/main/java/org/booklore/service/metadata/BookMetadataService.java

@@ -23,6 +23,7 @@ import org.booklore.repository.BookRepository;
 import org.booklore.service.NotificationService;
 import org.booklore.service.book.BookQueryService;
 import org.booklore.service.metadata.extractor.CbxMetadataExtractor;
+import org.booklore.service.metadata.extractor.MetadataExtractorFactory;
 import org.booklore.service.metadata.parser.BookParser;
 import org.booklore.service.metadata.parser.DetailedMetadataProvider;
 import org.booklore.util.FileUtils;
@@ -58,6 +59,7 @@ public class BookMetadataService {
     private final BookQueryService bookQueryService;
     private final Map<MetadataProvider, BookParser> parserMap;
     private final CbxMetadataExtractor cbxMetadataExtractor;
+    private final MetadataExtractorFactory metadataExtractorFactory;
     private final MetadataClearFlagsMapper metadataClearFlagsMapper;
     private final PlatformTransactionManager transactionManager;
 
@@ -147,6 +149,16 @@ public class BookMetadataService {
         return cbxMetadataExtractor.extractMetadata(new File(FileUtils.getBookFullPath(bookEntity)));
     }
 
+    public BookMetadata getFileMetadata(long bookId) {
+        log.info("Extracting file metadata for book ID: {}", bookId);
+        BookEntity bookEntity = bookRepository.findById(bookId).orElseThrow(() -> ApiError.BOOK_NOT_FOUND.createException(bookId));
+        var primaryFile = bookEntity.getPrimaryBookFile();
+        if (primaryFile == null) {
+            throw ApiError.GENERIC_BAD_REQUEST.createException("Book has no file to extract metadata from");
+        }
+        return metadataExtractorFactory.extractMetadata(primaryFile.getBookType(), new File(FileUtils.getBookFullPath(bookEntity)));
+    }
+
     @Transactional
     public void bulkUpdateMetadata(BulkMetadataUpdateRequest request, boolean mergeCategories, boolean mergeMoods, boolean mergeTags) {
         MetadataClearFlags clearFlags = metadataClearFlagsMapper.toClearFlags(request);

booklore-ui/src/app/features/book/service/book.service.ts

@@ -690,6 +690,10 @@ export class BookService {
     return this.http.post<void>(`${this.url}/${bookId}/regenerate-cover`, {});
   }
 
+  getFileMetadata(bookId: number): Observable<BookMetadata> {
+    return this.http.get<BookMetadata>(`${this.url}/${bookId}/file-metadata`);
+  }
+
   generateCustomCover(bookId: number): Observable<void> {
     return this.http.post<void>(`${this.url}/${bookId}/generate-custom-cover`, {});
   }

booklore-ui/src/app/features/metadata/component/book-metadata-center/metadata-editor/metadata-editor.component.html

@@ -161,7 +161,6 @@
                   <p-button [pTooltip]="t('unlockCoverTooltip')" tooltipPosition="top" size="small" icon="pi pi-lock" [outlined]="true" (onClick)="toggleLock('audiobookCover')" severity="warn"></p-button>
                 }
               </div>
-              `
             </div>
           }
         </div>
@@ -967,6 +966,18 @@
           }
 
           <div class="actions-right">
+            @if (!book.isPhysical) {
+              <p-button
+                [label]="isFetchingFromFile ? t('fetchingBtn') : t('fetchFromFileBtn')"
+                [icon]="isFetchingFromFile ? 'pi pi-spin pi-spinner' : 'pi pi-file'"
+                [outlined]="true"
+                severity="secondary"
+                (onClick)="fetchFromFile(book.id)"
+                [disabled]="isFetchingFromFile"
+                [pTooltip]="t('fetchFromFileTooltip')"
+                tooltipPosition="top">
+              </p-button>
+            }
             <p-button
               [label]="isAutoFetching ? t('fetchingBtn') : t('autoFetchBtn')"
               [icon]="isAutoFetching ? 'pi pi-spin pi-spinner' : 'pi pi-bolt'"
@@ -1025,6 +1036,17 @@
               </div>
             }
             <div class="mobile-lock-actions">
+              @if (!book.isPhysical) {
+                <p-button
+                  icon="pi pi-file"
+                  [outlined]="true"
+                  severity="secondary"
+                  (onClick)="fetchFromFile(book.id)"
+                  [disabled]="isFetchingFromFile"
+                  [pTooltip]="t('fetchFromFileBtn')"
+                  tooltipPosition="top">
+                </p-button>
+              }
               <p-button
                 icon="pi pi-bolt"
                 [outlined]="true"

booklore-ui/src/app/features/metadata/component/book-metadata-center/metadata-editor/metadata-editor.component.ts

@@ -90,6 +90,7 @@ export class MetadataEditorComponent implements OnInit {
 
   refreshingBookIds = new Set<number>();
   isAutoFetching = false;
+  isFetchingFromFile = false;
   autoSaveEnabled = false;
 
   originalMetadata!: BookMetadata;
@@ -1035,6 +1036,31 @@ export class MetadataEditorComponent implements OnInit {
     }, 15000);
   }
 
+  fetchFromFile(bookId: number) {
+    this.isFetchingFromFile = true;
+    this.bookService.getFileMetadata(bookId).pipe(
+      finalize(() => this.isFetchingFromFile = false),
+      takeUntilDestroyed(this.destroyRef)
+    ).subscribe({
+      next: (metadata) => {
+        this.populateFormFromMetadata(metadata);
+        this.metadataForm.markAsDirty();
+        this.messageService.add({
+          severity: 'info',
+          summary: this.t.translate('metadata.editor.toast.successSummary'),
+          detail: this.t.translate('metadata.editor.toast.fileMetadataLoaded'),
+        });
+      },
+      error: (err) => {
+        this.messageService.add({
+          severity: 'error',
+          summary: this.t.translate('metadata.editor.toast.errorSummary'),
+          detail: err?.error?.message || this.t.translate('metadata.editor.toast.fileMetadataFailed'),
+        });
+      }
+    });
+  }
+
   onNext() {
     this.nextBookClicked.emit();
   }

booklore-ui/src/i18n/en/metadata.json

@@ -83,6 +83,8 @@
     "unlockAllBtn": "Unlock All",
     "lockAllBtn": "Lock All",
     "saveBtn": "Save",
+    "fetchFromFileBtn": "From File",
+    "fetchFromFileTooltip": "Load metadata embedded in the book file",
     "previousBookTooltip": "Go to previous book",
     "nextBookTooltip": "Go to next book",
     "autoFetchTooltip": "Automatically fetch metadata using default sources",
@@ -125,7 +127,9 @@
       "customAudiobookCoverGenerated": "Custom audiobook cover generated successfully.",
       "customAudiobookCoverPartialDetail": "Cover generated but failed to refresh display. Please refresh the page.",
       "customAudiobookCoverFailed": "Failed to generate custom audiobook cover",
-      "audiobookUploadFailed": "An error occurred while uploading the audiobook cover"
+      "audiobookUploadFailed": "An error occurred while uploading the audiobook cover",
+      "fileMetadataLoaded": "Metadata loaded from book file. Review and save.",
+      "fileMetadataFailed": "Failed to extract metadata from book file"
     }
   },
   "picker": {

booklore-ui/src/i18n/es/metadata.json

@@ -83,6 +83,8 @@
     "unlockAllBtn": "Desbloquear todo",
     "lockAllBtn": "Bloquear todo",
     "saveBtn": "Guardar",
+    "fetchFromFileBtn": "Del archivo",
+    "fetchFromFileTooltip": "Cargar metadatos incrustados en el archivo del libro",
     "previousBookTooltip": "Ir al libro anterior",
     "nextBookTooltip": "Ir al libro siguiente",
     "autoFetchTooltip": "Obtener metadatos automáticamente usando fuentes predeterminadas",
@@ -125,7 +127,9 @@
       "customAudiobookCoverGenerated": "Portada personalizada del audiolibro generada correctamente.",
       "customAudiobookCoverPartialDetail": "Portada generada pero no se pudo actualizar la visualización. Por favor recarga la página.",
       "customAudiobookCoverFailed": "Error al generar portada personalizada del audiolibro",
-      "audiobookUploadFailed": "Ocurrió un error al subir la portada del audiolibro"
+      "audiobookUploadFailed": "Ocurrió un error al subir la portada del audiolibro",
+      "fileMetadataLoaded": "Metadatos cargados del archivo del libro. Revisa y guarda.",
+      "fileMetadataFailed": "Error al extraer metadatos del archivo del libro"
     }
   },
   "picker": {