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Aspose.PDF  for Python

在Python SDK中替换PDF中的签名

使用云端Python SDK替换PDF文档中的签名。

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如何通过云端Python SDK替换PDF中的签名

要在PDF中替换签名,我们将使用 Aspose.PDF Cloud Python SDK。此云端SDK帮助Python程序员使用Aspose.PDF REST API开发基于云的PDF创建、注释、编辑和转换应用程序。只需在Aspose for Cloud创建一个帐户并获取您的应用程序信息。一旦您拥有App SID和密钥,您就可以使用Aspose.PDF Cloud Python SDK。如果Python包托管在Github上,您可以直接从Github安装:

从Github安装


     
    pip install git+https://github.com/aspose-pdf-cloud/aspose-pdf-cloud-python.git

包管理器控制台命令

     
    pip install asposepdfcloud

通过Python SDK替换PDF中的签名步骤

Aspose.PDF Cloud开发人员可以轻松地加载和替换PDF中的签名,只需几行代码。

  1. 安装Python SDK
  2. 将PDF文档上传到云端,并设置下载处理后的文档。
  3. 向PDF文档添加新签名。
 

使用Python替换PDF中的签名


    import shutil
    import json
    import logging
    from pathlib import Path
    from asposepdfcloud import ApiClient, PdfApi, Signature, SignatureType, SignatureField, Rectangle

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


    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"
        LOCAL_SIGNATURE_PATH = Path(r"C:\Samples\Signatures\3")
        SIGNATURE_PFX = "signature.pfx"
        SIGNATURE_FORM_FIELD = 'Signature_1'
        SIGNATURE_PASSWORD='Password'
        SIGNATURE_CONTACT='Contact'
        SIGNATURE_LOCATION='Location'
        SIGNATURE_AUTHORITY='Issuer'
        SIGNATURE_DATE='04/19/2025 12:15:00.000 PM'
        SIGNATURE_RECT = Rectangle(100, 100, 500, 500)


    class PdfSignatures:
        """Class for managing PDF signatures 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_file(self, local_path: Path, fileName: str):
            """ Upload a local fileName to the Aspose Cloud server. """
            if self.pdf_api:
                file_path = local_path / fileName
                try:
                    self.pdf_api.upload_file(fileName, str(file_path))
                    logging.info(f"upload_file(): File '{fileName}' uploaded successfully.")
                except Exception as e:
                    logging.error(f"upload_document(): Failed to upload file: {e}")

        def upload_document(self):
            """ Upload a PDF document to the Aspose Cloud server. """
            self.upload_file(Config.LOCAL_FOLDER, Config.PDF_DOCUMENT_NAME)


        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 replace_signature(self):
            """Append a new signature to the PDF document."""
            if self.pdf_api:
                
                signature = Signature(
                    signature_path=Config.SIGNATURE_PFX,
                    signature_type=SignatureType.PKCS7,
                    password=Config.SIGNATURE_PASSWORD,
                    contact=Config.SIGNATURE_CONTACT,
                    location=Config.SIGNATURE_LOCATION,
                    visible=True,
                    rectangle=Config.SIGNATURE_RECT,
                    form_field_name=Config.SIGNATURE_FORM_FIELD,
                    authority=Config.SIGNATURE_AUTHORITY,
                    date=Config.SIGNATURE_DATE,
                    show_properties=False)
                
                field = SignatureField(page_index=1)
                field.signature = signature
                field.partial_name = 'sign1'
                field.rect = Config.SIGNATURE_RECT

                try:
                    response = self.pdf_api.put_signature_field(Config.PDF_DOCUMENT_NAME, Config.SIGNATURE_FORM_FIELD, field)
                    if response.code == 200:
                        logging.info(f"append_signature(): Signature '{Config.SIGNATURE_CONTACT}' successfully added to the document.")
                    else:
                        logging.error(f"append_signature(): Failed to add signature to the document. Response code: {response.code}")
                except Exception as e:
                    logging.error(f"append_signature(): Error while adding signature: {e}")


    if __name__ == "__main__":
        pdf_sign = PdfSignatures()
        pdf_sign.upload_document()
        pdf_sign.upload_file(Config.LOCAL_SIGNATURE_PATH, Config.SIGNATURE_PFX)
        pdf_sign.replace_signature()
        pdf_sign.download_result()
 

在PDF中处理签名

当原始签名过时、错误或无效时,替换PDF中的签名是必要的。这个过程确保文档反映最准确和授权的信息。替换的常见原因包括更新签名者凭证、更正签名细节中的错误、在文档更改后重新签名或切换到更强的数字证书以增强安全性和合规性。替换签名有助于维护文档的真实性、完整性和法律有效性。 使用Aspose.PDF Cloud Python SDK替换PDF文档中的签名。

使用我们的Python库,您可以:

  • 合并PDF文档。
  • 拆分PDF文件。
  • 将PDF转换为其他格式,反之亦然。
  • 操作注释。
  • 处理PDF中的图像等。
  • 您可以尝试我们的免费应用在线测试功能。