from __future__ import annotations
import io
from typing import List, Iterator, Tuple, Optional, Any, TYPE_CHECKING, Callable
from ctypes import *
from datetime import datetime
from numbers import Number
from pdftools_toolbox.internal import _lib
from pdftools_toolbox.internal.utils import _string_to_utf16, _utf16_to_string
from pdftools_toolbox.internal.streams import _StreamDescriptor, _NativeStream
from pdftools_toolbox.internal.native_base import _NativeBase
from pdftools_toolbox.internal.native_object import _NativeObject
import pdftools_toolbox.internal
import pdftools_toolbox.pdf.forms.signature_field
if TYPE_CHECKING:
from pdftools_toolbox.sys.date import _Date
else:
_Date = "pdftools_toolbox.sys.date._Date"
[docs]
class SignedSignatureField(pdftools_toolbox.pdf.forms.signature_field.SignatureField):
"""
A base class for signature fields that have been signed
The existence of a signed signature field does not imply,
that the signature is valid, the signature is actually not validated at all.
"""
@property
def name(self) -> Optional[str]:
"""
The name of the person or authority that signed the document
This is the name of the signing certificate.
Note: The name of the signing certificate can only be extracted for signatures conforming to the PAdES or PDF standard
and not for proprietary/non-standard signature formats.
For non-standard signature formats the name as stored in the PDF is returned.
Returns:
Optional[str]
Raises:
StateError:
if the object has already been closed
"""
_lib.PtxPdfForms_SignedSignatureField_GetNameW.argtypes = [c_void_p, POINTER(c_wchar), c_size_t]
_lib.PtxPdfForms_SignedSignatureField_GetNameW.restype = c_size_t
ret_val_size = _lib.PtxPdfForms_SignedSignatureField_GetNameW(self._handle, None, 0)
if ret_val_size == 0:
_NativeBase._throw_last_error()
return None
ret_val = create_unicode_buffer(ret_val_size)
_lib.PtxPdfForms_SignedSignatureField_GetNameW(self._handle, ret_val, c_size_t(ret_val_size))
return _utf16_to_string(ret_val, ret_val_size)
@property
def date(self) -> Optional[datetime]:
"""
The date and time of signing
This represents the date and time of signing as specified in the signature.
For signatures that contain a time-stamp, the trusted time-stamp time is returned.
Note: The value can only be extracted for signatures conforming to the PAdES or PDF standard
and not for proprietary/non-standard signature formats.
For non-standard signature formats the date as stored in the PDF is returned.
Returns:
Optional[datetime]
Raises:
StateError:
if the object has already been closed
"""
from pdftools_toolbox.sys.date import _Date
_lib.PtxPdfForms_SignedSignatureField_GetDate.argtypes = [c_void_p, POINTER(_Date)]
_lib.PtxPdfForms_SignedSignatureField_GetDate.restype = c_bool
ret_val = _Date()
if not _lib.PtxPdfForms_SignedSignatureField_GetDate(self._handle, byref(ret_val)):
_NativeBase._throw_last_error()
return None
return ret_val._to_datetime()
@property
def signature_contents(self) -> List[int]:
"""
Returns binary content of the /Contents key, without interpretation or decoding.
Returns:
List[int]
"""
_lib.PtxPdfForms_SignedSignatureField_GetSignatureContents.argtypes = [c_void_p, POINTER(c_ubyte), c_size_t]
_lib.PtxPdfForms_SignedSignatureField_GetSignatureContents.restype = c_size_t
ret_val_size = _lib.PtxPdfForms_SignedSignatureField_GetSignatureContents(self._handle, None, 0)
if ret_val_size == -1:
_NativeBase._throw_last_error(False)
ret_val = (c_ubyte * ret_val_size)()
_lib.PtxPdfForms_SignedSignatureField_GetSignatureContents(self._handle, ret_val, c_size_t(ret_val_size))
return list(ret_val)
@staticmethod
def _create_dynamic_type(handle):
_lib.PtxPdfForms_SignedSignatureField_GetType.argtypes = [c_void_p]
_lib.PtxPdfForms_SignedSignatureField_GetType.restype = c_int
obj_type = _lib.PtxPdfForms_SignedSignatureField_GetType(handle)
# Create and return the object based on the type
if obj_type == 0:
return SignedSignatureField._from_handle(handle)
elif obj_type == 1:
from pdftools_toolbox.pdf.forms.signature import Signature
return Signature._from_handle(handle)
elif obj_type == 2:
from pdftools_toolbox.pdf.forms.document_signature import DocumentSignature
return DocumentSignature._from_handle(handle)
elif obj_type == 3:
from pdftools_toolbox.pdf.forms.doc_mdp_signature import DocMdpSignature
return DocMdpSignature._from_handle(handle)
elif obj_type == 4:
from pdftools_toolbox.pdf.forms.document_time_stamp import DocumentTimeStamp
return DocumentTimeStamp._from_handle(handle)
else:
return None
@classmethod
def _from_handle(cls, handle):
"""
Internal factory method for constructing an instance using an internal handle.
This method creates an instance of the class by bypassing the public constructor.
"""
instance = SignedSignatureField.__new__(cls) # Bypass __init__
instance._initialize(handle)
return instance
def _initialize(self, handle):
super()._initialize(handle)