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""" Generate the qr code for Saudi e-invoicing. Specs are available at the following link at page 23
https://zatca.gov.sa/ar/E-Invoicing/SystemsDevelopers/Documents/20210528_ZATCA_Electronic_Invoice_Security_Features_Implementation_Standards_vShared.pdf
"""
def get_qr_encoding(tag, field):
company_name_byte_array = field.encode()
company_name_tag_encoding = tag.to_bytes(length=1, byteorder='big')
company_name_length_encoding = len(company_name_byte_array).to_bytes(length=1, byteorder='big')
return company_name_tag_encoding + company_name_length_encoding + company_name_byte_array
for record in self:
qr_code_str = ''
if record.l10n_sa_confirmation_datetime and record.company_id.vat:
seller_name_enc = get_qr_encoding(1, record.company_id.display_name)
company_vat_enc = get_qr_encoding(2, record.company_id.vat)
time_sa = fields.Datetime.context_timestamp(self.with_context(tz='Asia/Riyadh'), record.l10n_sa_confirmation_datetime)
timestamp_enc = get_qr_encoding(3, time_sa.strftime(self._get_iso_format_asia_riyadh_date('T')))
totals = record._get_l10n_sa_totals()
invoice_total_enc = get_qr_encoding(4, float_repr(abs(totals['total_amount']), 2))
total_vat_enc = get_qr_encoding(5, float_repr(abs(totals['total_tax']), 2))
str_to_encode = seller_name_enc + company_vat_enc + timestamp_enc + invoice_total_enc + total_vat_enc
qr_code_str = base64.b64encode(str_to_encode).decode()
record.l10n_sa_qr_code_str = qr_code_str
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