def _insert_or_get_field_at(writer: BasePdfFileWriter, fields, path,
parent_ref=None, modified=False, field_obj=None):
current_partial, tail = path[0], path[1:]
for field_ref in fields:
assert isinstance(field_ref, generic.IndirectObject)
field = field_ref.get_object()
if field.get('/T', None) == current_partial:
break
else:
# have to insert a new element into the fields array
if field_obj is not None and not tail:
field = field_obj
else:
# create a generic field
field = generic.DictionaryObject()
field['/T'] = pdf_string(current_partial)
if parent_ref is not None:
field['/Parent'] = parent_ref
field_ref = writer.add_object(field)
fields.append(field_ref)
writer.update_container(fields)
modified = True
if not tail:
return modified, field_ref
# check for /Kids, and create it if necessary
try:
kids = field['/Kids']
except KeyError:
kids = field['/Kids'] = generic.ArrayObject()
writer.update_container(field)
modified = True
# recurse in to /Kids array
return _insert_or_get_field_at(
writer, kids, tail, parent_ref=field_ref,
modified=modified, field_obj=field_obj
)
def __init__(self, stream_xrefs=True):
# root object
root = generic.DictionaryObject({
pdf_name("/Type"): pdf_name("/Catalog"),
})
id1 = generic.ByteStringObject(os.urandom(16))
id2 = generic.ByteStringObject(os.urandom(16))
id_obj = generic.ArrayObject([id1, id2])
# info object
info = generic.DictionaryObject({
pdf_name('/Producer'): pdf_string(VENDOR)
})
super().__init__(root, info, id_obj, stream_xrefs=stream_xrefs)
pages = generic.DictionaryObject({
pdf_name("/Type"): pdf_name("/Pages"),
pdf_name("/Count"): generic.NumberObject(0),
pdf_name("/Kids"): generic.ArrayObject(),
})
root[pdf_name('/Pages')] = self.add_object(pages)
def test_sv_deserialisation():
sv_input = generic.DictionaryObject({
pdf_name('/SubFilter'):
generic.ArrayObject(
map(pdf_name, ['/foo', '/adbe.pkcs7.detached', '/bleh'])),
pdf_name('/LegalAttestation'):
generic.ArrayObject(['xyz', 'abc', 'def']),
pdf_name('/AppearanceFilter'):
generic.pdf_string('blah'),
pdf_name('/LockDocument'):
generic.pdf_name('/true')
})
sv = fields.SigSeedValueSpec.from_pdf_object(sv_input)
assert len(sv.subfilters) == 1
assert len(sv.legal_attestations) == 3
assert sv.lock_document == fields.SeedLockDocument.LOCK
sv_output = sv.as_pdf_object()
assert sv_output['/AppearanceFilter'] == sv_input['/AppearanceFilter']
assert sv_output['/LockDocument'] == sv_input['/LockDocument']
assert sv_output['/LegalAttestation'] == sv_input['/LegalAttestation']
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject(
{pdf_name('/LockDocument'): generic.pdf_name('/nonsense')}))
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject(
{pdf_name('/LockDocument'): generic.BooleanObject(True)}))
bad_filter = generic.DictionaryObject(
{pdf_name('/Filter'): pdf_name('/unsupported')})
# this should run
fields.SigSeedValueSpec.from_pdf_object(bad_filter)
with pytest.raises(SigningError):
bad_filter[pdf_name('/Ff')] = \
generic.NumberObject(fields.SigSeedValFlags.FILTER.value)
fields.SigSeedValueSpec.from_pdf_object(bad_filter)
def as_pdf_object(self):
"""
Render this :class:`.SigSeedValueSpec` object to a PDF dictionary.
:return:
A :class:`~.generic.DictionaryObject`.
"""
min_version = SeedValueDictVersion.PDF_1_5
result = generic.DictionaryObject({
pdf_name('/Type'):
pdf_name('/SV'),
pdf_name('/Ff'):
generic.NumberObject(self.flags.value),
})
if self.subfilters is not None:
result[pdf_name('/SubFilter')] = generic.ArrayObject(
sf.value for sf in self.subfilters)
if self.add_rev_info is not None:
min_version = SeedValueDictVersion.PDF_1_7
result[pdf_name('/AddRevInfo')] = generic.BooleanObject(
self.add_rev_info)
if self.digest_methods is not None:
min_version = SeedValueDictVersion.PDF_1_7
result[pdf_name('/DigestMethod')] = generic.ArrayObject(
map(pdf_string, self.digest_methods))
if self.reasons is not None:
result[pdf_name('/Reasons')] = generic.ArrayObject(
pdf_string(reason) for reason in self.reasons)
if self.timestamp_server_url is not None:
min_version = SeedValueDictVersion.PDF_1_7
result[pdf_name('/TimeStamp')] = generic.DictionaryObject({
pdf_name('/URL'):
pdf_string(self.timestamp_server_url),
pdf_name('/Ff'):
generic.NumberObject(1 if self.timestamp_required else 0)
})
if self.cert is not None:
result[pdf_name('/Cert')] = self.cert.as_pdf_object()
if self.seed_signature_type is not None:
mdp_perm = self.seed_signature_type.mdp_perm
result[pdf_name('/MDP')] = generic.DictionaryObject({
pdf_name('/P'):
generic.NumberObject(
mdp_perm.value if mdp_perm is not None else 0)
})
if self.legal_attestations is not None:
result[pdf_name('/LegalAttestation')] = generic.ArrayObject(
pdf_string(att) for att in self.legal_attestations)
if self.lock_document is not None:
min_version = SeedValueDictVersion.PDF_2_0
result[pdf_name('/LockDocument')] = self.lock_document.value
if self.appearance is not None:
result[pdf_name('/AppearanceFilter')] = pdf_string(self.appearance)
specified_version = self.sv_dict_version
if specified_version is not None:
result[pdf_name('/V')] = generic.NumberObject(
specified_version.
value if isinstance(specified_version, SeedValueDictVersion
) else specified_version)
else:
result[pdf_name('/V')] = generic.NumberObject(min_version.value)
return result
w.objects[(dummy_ref.generation, dummy_ref.idnum)] = dss
w.root['/DSS'] = generic.IndirectObject(idnum=dummy_ref.idnum,
generation=dummy_ref.generation,
pdf=w)
w.update_root()
out = BytesIO()
w.write(out)
r = PdfFileReader(out)
s = r.embedded_signatures[0]
assert s.field_name == 'Sig1'
val_trusted_but_modified(s)
BOGUS_DSS_VALUES = [
generic.pdf_string("Hi there"),
generic.DictionaryObject({pdf_name('/Blah'): generic.NullObject()}),
generic.DictionaryObject({pdf_name('/Certs'): generic.NullObject()}),
generic.DictionaryObject({pdf_name('/VRI'): generic.NullObject()}),
generic.DictionaryObject({
pdf_name('/VRI'):
generic.DictionaryObject({pdf_name('/Bleh'): generic.NullObject()})
}),
generic.DictionaryObject({
pdf_name('/VRI'):
generic.DictionaryObject(
{pdf_name('/' + 'A' * 40): generic.NullObject()})
}),
generic.DictionaryObject({
pdf_name('/VRI'):
generic.DictionaryObject({