def build_absolute_uri(request, location, protocol=None):
"""request.build_absolute_uri() helper
Like request.build_absolute_uri, but gracefully handling
the case where request is None.
"""
from .account import app_settings as account_settings
if request is None:
site = get_current_site()
bits = urlsplit(location)
if not (bits.scheme and bits.netloc):
uri = '{proto}://{domain}{url}'.format(
proto=account_settings.DEFAULT_HTTP_PROTOCOL,
domain=site.domain,
url=location)
else:
uri = location
else:
uri = request.build_absolute_uri(location)
# NOTE: We only force a protocol if we are instructed to do so
# (via the `protocol` parameter, or, if the default is set to
# HTTPS. The latter keeps compatibility with the debatable use
# case of running your site under both HTTP and HTTPS, where one
# would want to make sure HTTPS links end up in password reset
# mails even while they were initiated on an HTTP password reset
# form.
if not protocol and account_settings.DEFAULT_HTTP_PROTOCOL == 'https':
protocol = account_settings.DEFAULT_HTTP_PROTOCOL
# (end NOTE)
if protocol:
uri = protocol + ':' + uri.partition(':')[2]
return uri
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