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devicehub-teal/ereuse_devicehub/utils.py

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from urllib.parse import urljoin, urlparse
def is_safe_url(request, 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