Added change password in pdf snippet

Uses-Cases/EncryptDecrypt/PasswordChange.py

@@ -0,0 +1,84 @@
+import shutil
+import json
+import logging
+from pathlib import Path
+import base64
+from asposepdfcloud import ApiClient, PdfApi
+
+# 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_encrypted.pdf"
+    LOCAL_RESULT_DOCUMENT_NAME = "output_sample.pdf"
+    DOCUMENT_PASSWORD = 'Owner-Password'
+    NEW_USER_PASSWORD = "NEW-User-Password"
+    NEW_OWNER_PASSWORD = "NEW-Owner-Password"
+
+class pdfEncoder:
+    """Class for replacing password in PDF encrypted document 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_file(): 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 / ("password_change_" + 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 change_passwords(self):
+        """Decrypt the PDF document."""
+        if self.pdf_api:
+            try:
+                password_encoded = base64.b64encode(bytes(Config.DOCUMENT_PASSWORD, encoding='utf-8'))
+
+                new_owner_pwd_encoded = base64.b64encode(bytes(Config.NEW_OWNER_PASSWORD, encoding='utf-8'))
+                new_user_pwd_encoded = base64.b64encode(bytes(Config.NEW_USER_PASSWORD, encoding='utf-8'))
+
+                response = self.pdf_api.post_change_password_document_in_storage(Config.PDF_DOCUMENT_NAME, password_encoded, new_user_pwd_encoded, new_owner_pwd_encoded)
+                if response.code == 200:
+                    logging.info(f"change_passwords(): Password in document #{Config.PDF_DOCUMENT_NAME} successfully modified.")
+                else:
+                    logging.error(f"change_passwords(): Failed to chnage passowd in document #{Config.PDF_DOCUMENT_NAME}. Response code: {response.code}")
+            except Exception as e:
+                logging.error(f"change_passwords(): Error while change passwords in document: {e}")
+
+
+if __name__ == "__main__":
+    pdf_encoder = pdfEncoder()
+    pdf_encoder.upload_document()
+    pdf_encoder.change_passwords()
+    pdf_encoder.download_result()
+
+