79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
#!/usr/bin/env python
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"""Script for papeless-ngx to decrypt pdf files secured with a password
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Passwords to check ar in file /usr/src/paperless/scripts/passwords.txt
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Original from https://piep.tech/posts/automatic-password-removal-in-paperless-ngx/
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"""
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import sys
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import os
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import pikepdf
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PWD_PATH = "/usr/src/paperless/scripts/passwords.txt"
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#PWD_PATH = "input/passwords.txt"
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def read_passwords_from_file():
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"""Read Paswors from file"""
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passwords = []
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with open(PWD_PATH, "r", encoding="utf-8") as f:
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passwords = f.readlines()
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passwords = list(filter(len, map(str.strip, passwords)))
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if not passwords:
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print("Empty password file")
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return passwords
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def unlock_pdf(file_path, password_list):
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"""Removes Password from PDF. A list of passwords is tried through."""
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for pwd in password_list:
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try:
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with pikepdf.open(file_path, password=pwd, allow_overwriting_input=True) as pdf:
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pdf.save(file_path)
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return True
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except pikepdf.PasswordError:
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continue
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return False
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def is_pdf_encrypted(file_path):
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"""Checks if a PDF file is encrypted"""
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try:
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with pikepdf.open(file_path) as pdf:
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return pdf.is_encrypted
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except pikepdf.PasswordError:
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return True
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def is_pdf(file_path):
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"""Check if Filename ends with PDF. File is not opened"""
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return os.path.splitext(file_path)[-1].lower() == ".pdf"
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if __name__ == "__main__":
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doc_path = os.environ.get('DOCUMENT_WORKING_PATH')
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if not os.path.exists(doc_path):
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print(f"Document {doc_path} not found.")
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sys.exit(1)
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if not is_pdf(doc_path):
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print(f"Document {doc_path} is not a PDF. So no decryption needed.")
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sys.exit(0)
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if not is_pdf_encrypted(doc_path):
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print(f"Document {doc_path} was already decrypted and no password needed.")
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sys.exit(0)
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pwds = read_passwords_from_file()
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if unlock_pdf(doc_path, pwds):
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print(f"Document {doc_path} successfull decrypted.")
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sys.exit(0)
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else:
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print(f"Document {doc_path} could not be decrypted.")
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sys.exit(1)
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