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[WIP] encrypted_ props #254

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[WIP] encrypted_ props #254

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44 changes: 44 additions & 0 deletions dash/dash.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,12 @@
from . import exceptions
from ._utils import AttributeDict as _AttributeDict

from cryptography.fernet import Fernet
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
from cryptography.hazmat.backends import default_backend



# pylint: disable=too-many-instance-attributes
# pylint: disable=too-many-arguments
Expand All @@ -31,6 +37,7 @@ def __init__(
static_folder='static',
url_base_pathname='/',
compress=True,
encryption_keystring='',
**kwargs):

# pylint-disable: too-many-instance-attributes
Expand Down Expand Up @@ -122,6 +129,23 @@ def add_url(name, view_func, methods=('GET',)):
self._cached_layout = None
self.routes = []

self.fernet_key = None

if encryption_keystring != '':
if len(encryption_keystring) < 30:
raise Exception(
''
'encryption_keystring must be at least 30 characters.')
else:
hkdf = HKDF(
algorithm=hashes.SHA256(),
length=32,
salt=None,
info=None,
backend=default_backend()
)
self.fernet_key = hkdf.derive(encryption_keystring)

@property
def layout(self):
return self._layout
Expand Down Expand Up @@ -513,6 +537,18 @@ def wrap_func(func):
def add_context(*args, **kwargs):

output_value = func(*args, **kwargs)

if output.component_property.startswith("encrypted_"):
if not self.fernet_key:
raise Exception(
''
'You must provide an encryption_keystring '
'to use encrypted_* properties.')
f = Fernet(self.fernet_key)
output_value_str = json.dumps(output_value,
cls=plotly.utils.PlotlyJSONEncoder)
output_value = f.encrypt(bytes(output_value_str))

response = {
'response': {
'props': {
Expand Down Expand Up @@ -547,6 +583,14 @@ def dispatch(self):
c['property'] == component_registration['property'] and
c['id'] == component_registration['id']
][0])
if component_registration['property'].startswith("encrypted_"):
if not self.fernet_key:
raise Exception(
''
'You must provide an encryption_keystring '
'to use encrypted_* properties.')
f = Fernet(self.fernet_key)
args[-1] = json.loads(f.decrypt(bytes(args[-1])))

for component_registration in self.callback_map[target_id]['state']:
args.append([
Expand Down