def certificate():
id = request.args.get('id')
donor = Donor.query.filter(Donor.id == id).first()
file_dir = os.path.join(basedir, app.config['IMG_FOLDER'])
if donor:
no = "WH2020012310{0:04d}".format(donor.id)
certi_file = "%s.png" % os.path.join(file_dir, no)
if not os.path.exists(certi_file):
amount = "%.2f" % donor.amount
cert = Certificate(donor.name, amount, no)
cert.grant()
image_data = open(certi_file, "rb").read()
response = make_response(image_data)
response.headers['Content-Type'] = 'image/png'
return response
