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from odoo import models, fields, _
from odoo.exceptions import UserError
from .account_edi_proxy_auth import OdooEdiProxyAuth
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.fernet import Fernet
import requests
import uuid
import base64
import logging
_logger = logging.getLogger(__name__)
SERVER_URL = 'https://l10n-it-edi.api.odoo.com'
TIMEOUT = 30
class AccountEdiProxyError(Exception):
def __init__(self, code, message=False):
self.code = code
self.message = message
super().__init__(message or code)
class AccountEdiProxyClientUser(models.Model):
"""Represents a user of the proxy for an electronic invoicing format.
An edi_proxy_user has a unique identification on a specific format (for example, the vat for Peppol) which
allows to identify him when receiving a document addressed to him. It is linked to a specific company on a specific
Odoo database.
It also owns a key with which each file should be decrypted with (the proxy encrypt all the files with the public key).
"""
_name = 'account_edi_proxy_client.user'
_description = 'Account EDI proxy user'
active = fields.Boolean(default=True)
id_client = fields.Char(required=True, index=True)
company_id = fields.Many2one('res.company', string='Company', required=True,
default=lambda self: self.env.company)
edi_format_id = fields.Many2one('account.edi.format', required=True)
edi_format_code = fields.Char(related='edi_format_id.code', readonly=True)
edi_identification = fields.Char(required=True, help="The unique id that identifies this user for on the edi format, typically the vat")
private_key = fields.Binary(required=True, attachment=False, groups="base.group_system", help="The key to encrypt all the user's data")
refresh_token = fields.Char(groups="base.group_system")
_sql_constraints = [
('unique_id_client', 'unique(id_client)', 'This id_client is already used on another user.'),
('unique_edi_identification_per_format', 'unique(edi_identification, edi_format_id)', 'This edi identification is already assigned to a user'),
]
def _make_request(self, url, params=False):
''' Make a request to proxy and handle the generic elements of the reponse (errors, new refresh token).
'''
payload = {
'jsonrpc': '2.0',
'method': 'call',
'params': params or {},
'id': uuid.uuid4().hex,
}
if self.env['ir.config_parameter'].get_param('account_edi_proxy_client.demo', False):
# Last barrier : in case the demo mode is not handled by the caller, we block access.
raise Exception("Can't access the proxy in demo mode")
try:
response = requests.post(
url,
json=payload,
timeout=TIMEOUT,
headers={'content-type': 'application/json'},
auth=OdooEdiProxyAuth(user=self)).json()
except (ValueError, requests.exceptions.ConnectionError, requests.exceptions.MissingSchema, requests.exceptions.Timeout, requests.exceptions.HTTPError):
raise AccountEdiProxyError('connection_error',
_('The url that this service requested returned an error. The url it tried to contact was %s', url))
if 'error' in response:
message = _('The url that this service requested returned an error. The url it tried to contact was %s. %s', url, response['error']['message'])
if response['error']['code'] == 404:
message = _('The url that this service does not exist. The url it tried to contact was %s', url)
raise AccountEdiProxyError('connection_error', message)
proxy_error = response['result'].pop('proxy_error', False)
if proxy_error:
error_code = proxy_error['code']
if error_code == 'refresh_token_expired':
self._renew_token()
return self._make_request(url, params)
if error_code == 'no_such_user':
# This error is also raised if the user didn't exchange data and someone else claimed the edi_identificaiton.
self.active = False
raise AccountEdiProxyError(error_code, proxy_error['message'] or False)
return response['result']
def _register_proxy_user(self, company, edi_format, edi_identification):
''' Generate the public_key/private_key that will be used to encrypt the file, send a request to the proxy
to register the user with the public key and create the user with the private key.
:param company: the company of the user.
:param edi_identification: The unique ID that identifies this user on this edi network and to which the files will be addressed.
Typically the vat.
'''
# public_exponent=65537 is a default value that should be used most of the time, as per the documentation of cryptography.
# key_size=2048 is considered a reasonable default key size, as per the documentation of cryptography.
# see https://cryptography.io/en/latest/hazmat/primitives/asymmetric/rsa/
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
private_pem = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption()
)
public_key = private_key.public_key()
public_pem = public_key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
if self.env['ir.config_parameter'].get_param('account_edi_proxy_client.demo', False):
# simulate registration
response = {'id_client': 'demo', 'refresh_token': 'demo'}
else:
try:
response = self._make_request(SERVER_URL + '/iap/account_edi/1/create_user', params={
'dbuuid': company.env['ir.config_parameter'].get_param('database.uuid'),
'company_id': company.id,
'edi_format_code': edi_format.code,
'edi_identification': edi_identification,
'public_key': base64.b64encode(public_pem)
})
except AccountEdiProxyError as e:
raise UserError(e.message)
if 'error' in response:
raise UserError(response['error'])
self.create({
'id_client': response['id_client'],
'company_id': company.id,
'edi_format_id': edi_format.id,
'edi_identification': edi_identification,
'private_key': base64.b64encode(private_pem),
'refresh_token': response['refresh_token'],
})
def _renew_token(self):
''' Request the proxy for a new refresh token.
Request to the proxy should be made with a refresh token that expire after 24h to avoid
that multiple database use the same credentials. When receiving an error for an expired refresh_token,
This method makes a request to get a new refresh token.
'''
response = self._make_request(SERVER_URL + '/iap/account_edi/1/renew_token')
if 'error' in response:
# can happen if the database was duplicated and the refresh_token was refreshed by the other database.
# we don't want two database to be able to query the proxy with the same user
# because it could lead to not inconsistent data.
_logger.error(response['error'])
raise UserError('Proxy error, please contact Odoo (code: 3)')
self.refresh_token = response['refresh_token']
def _decrypt_data(self, data, symmetric_key):
''' Decrypt the data. Note that the data is encrypted with a symmetric key, which is encrypted with an asymmetric key.
We must therefore decrypt the symmetric key.
:param data: The data to decrypt.
:param symmetric_key: The symmetric_key encrypted with self.private_key.public_key()
'''
private_key = serialization.load_pem_private_key(
base64.b64decode(self.private_key),
password=None,
backend=default_backend()
)
key = private_key.decrypt(
base64.b64decode(symmetric_key),
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
)
f = Fernet(key)
return f.decrypt(base64.b64decode(data))
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