在 Python SDK 中向 PDF 添加印章

    import shutil
    import json
    import logging
    from pathlib import Path
    from asposepdfcloud import ApiClient, PdfApi, Stamp, AsposeResponse, HorizontalAlignment, StampType

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

    class Config:
        """Configuration parameters."""
        CREDENTIALS_FILE = Path(r"C:\\Projects\\ASPOSE\\Pdf.Cloud\\Credentials\\credentials.json")
        LOCAL_FOLDER = Path(r"C:\Samples")
        PDF_DOCUMENT_NAME = "sample.pdf"
        LOCAL_RESULT_DOCUMENT_NAME = "output_sample.pdf"
        PAGE_NUMBER = 2
        STAMP_TEXT = "NEW TEXT STAMP"

    class PdfPages:
        """ Class for managing PDF pages 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("init_api(): 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"init_api(): 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"upload_document(): File {Config.PDF_DOCUMENT_NAME} uploaded successfully.")
                except Exception as e:
                    logging.error(f"upload_document(): 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 add_page_text_stamp(self):
            """ Adds a text stamp to a specific page in a PDF document. """
            if self.pdf_api:
                page_stamp: Stamp = Stamp(
                    type = StampType.TEXT,
                    background = True,
                    horizontal_alignment = HorizontalAlignment.CENTER,
                    text_alignment = HorizontalAlignment.CENTER,
                    value = Config.STAMP_TEXT,
                    page_index = Config.PAGE_NUMBER,
                )

                response: AsposeResponse = self.pdf_api.put_page_add_stamp(Config.PDF_DOCUMENT_NAME, Config.PAGE_NUMBER, page_stamp)

                if response.code == 200:
                    logging.info(f"Text stamp '{Config.STAMP_TEXT}' added to page #{Config.PAGE_NUMBER}.")
                else:
                    logging.error(f"Failed to add text stamp '{Config.STAMP_TEXT}' to page #{Config.PAGE_NUMBER}.")

    if __name__ == "__main__":
        pdf_pages = PdfPages()
        pdf_pages.upload_document()
        pdf_pages.add_page_text_stamp()
        pdf_pages.download_result()