Replace Bookmarks in PDF in Python SDK

    import shutil
    import json
    import logging
    from pathlib import Path
    from asposepdfcloud import ApiClient, PdfApi, Bookmark, BookmarksResponse, BookmarkResponse

    class Config:
        """Configuration parameters."""
        CREDENTIALS_FILE = Path(r"..\\credentials.json")
        LOCAL_FOLDER = Path(r"C:\\Samples")
        PDF_DOCUMENT_NAME = "sample.pdf"
        LOCAL_RESULT_DOCUMENT_NAME = "output_sample.pdf"
        NEW_BOOKMARK_TITLE = "• Increased performance." #"• Productivity improvement"
        BOOKMARK_PATH = "/5"
        NEW_BOOKMARK_PAGE_NUMBER = 3

    # Configure logging
    logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")

    class PdfBookmarks:
        """Class for managing PDF bookmarkss using Aspose PDF Cloud API."""

        def __init__(self, credentials_file: Path = Config.CREDENTIALS_FILE):
            self.pdf_api = None
            self._init_api(credentials_file)

        def _init_api(self, credentials_file: Path):
            """Initialize the API client."""
            try:
                with credentials_file.open("r", encoding="utf-8") as file:
                    credentials = json.load(file)
                    api_key, app_id = credentials.get("key"), credentials.get("id")
                    if not api_key or not app_id:
                        raise ValueError("Error: Missing API keys in the credentials file.")
                    self.pdf_api = PdfApi(ApiClient(api_key, app_id))
            except (FileNotFoundError, json.JSONDecodeError, ValueError) as e:
                logging.error(f"Failed to load credentials: {e}")

        def upload_document(self):
            """Upload a PDF document to the Aspose Cloud server."""
            if self.pdf_api:
                file_path = Config.LOCAL_FOLDER / Config.PDF_DOCUMENT_NAME
                try:
                    self.pdf_api.upload_file(Config.PDF_DOCUMENT_NAME, str(file_path))
                    logging.info(f"File {Config.PDF_DOCUMENT_NAME} uploaded successfully.")
                except Exception as e:
                    logging.error(f"Failed to upload file: {e}")

        def download_result(self):
            """Download the processed PDF document from the Aspose Cloud server."""
            if self.pdf_api:
                try:
                    temp_file = self.pdf_api.download_file(Config.PDF_DOCUMENT_NAME)
                    local_path = Config.LOCAL_FOLDER / Config.LOCAL_RESULT_DOCUMENT_NAME
                    shutil.move(temp_file, str(local_path))
                    logging.info(f"download_result(): File successfully downloaded: {local_path}")
                except Exception as e:
                    logging.error(f"download_result(): Failed to download file: {e}")

        def show_bookmarks_array(self, bookmarks, prefix):
            for item in bookmarks.list:
                logging.info(f"{prefix} => level: '{item.level}' - action: '{item.action}' - title: '{item.title}'")
                if item.bookmarks and item.bookmarks.list and item.bookmarks.list.length > 0:
                    self.show_bookmarks_array(bookmarks=item.bookmarks, prefix=prefix)

        def get_all_bookmarks(self):
            """Get all bookmarks for a specific PDF document."""    
            if self.pdf_api:
                try:
                    response : BookmarksResponse = self.pdf_api.get_document_bookmarks( Config.PDF_DOCUMENT_NAME)
                    if response.code == 200:
                        self.show_bookmarks_array(response.bookmarks, "All")
                    else:
                        logging.error(f"Failed to get bookmarks for the document. Response code: {response.code}")
                except Exception as e:
                    logging.error(f"Error while retrieving bookmarks array: {e}")

        def get_bookmark(self):
            """Get bookmark for a specific PDF document using bookmark path."""    
            if self.pdf_api:
                try:
                    response : BookmarkResponse = self.pdf_api.get_bookmark( Config.PDF_DOCUMENT_NAME, Config.BOOKMARK_PATH)
                    if response.code == 200:
                        logging.info(f"Found bookmark => level: '{response.bookmark.level}' - action: '{response.bookmark.action}' - title: '{response.bookmark.title}'")
                        return response.bookmark
                    else:
                        logging.error(f"Failed to find bookmark for the document. Response code: {response.code}")
                        return None
                except Exception as e:
                    logging.error(f"Error while find bookmark: {e}")

        def replace_bookmark(self):
            if self.pdf_api:
                _bookmark: BookmarkResponse = self.get_bookmark()

                if not _bookmark:
                    return

                _bookmark.title = Config.NEW_BOOKMARK_TITLE

                response: BookmarkResponse = self.pdf_api.put_bookmark(
                    Config.PDF_DOCUMENT_NAME,
                    Config.BOOKMARK_PATH,
                    bookmark=_bookmark,
                )

                if response.code == 200:
                    print("Bookmark replaced successfully.")
                else:
                    print("Failed to replace Bookmark.")


    if __name__ == "__main__":
        pdf_bookmarks = PdfBookmarks()
        pdf_bookmarks.upload_document()
        pdf_bookmarks.get_all_bookmarks()
        pdf_bookmarks.replace_bookmark()
        pdf_bookmarks.download_result()