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utils.py

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from urllib.parse import urlparse, urljoin

from flask import request

def is_safe_url(target):

ref_url = urlparse(request.host_url)

test_url = urlparse(urljoin(request.host_url, target))

return test_url.scheme in ('http', 'https') and ref_url.netloc == test_url.netloc

def get_redirect_target():

for target in request.values.get('next'), request.referrer:

if not target:

continue

if is_safe_url(target):

return target