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import functools
import flask
def add_response_headers(headers: dict):
"""This decorator adds the headers passed in to the response"""
def decorator(f):
def decorated_function(*args, **kwargs):
resp = flask.make_response(f(*args, **kwargs))
h = resp.headers
for header, value in headers.items():
h[header] = value
return resp
return decorated_function
return decorator
def vary_xhr():
"""View function decorator; adds HTTP header "Vary: X-Requested-With" to the response"""
def decorator(f):
header_adder = add_response_headers({'Vary': 'X-Requested-With'})
return header_adder(f)
return decorator
def ensure_schema(url: str) -> str:
"""Return the same URL with the configured PREFERRED_URL_SCHEME."""
import urllib.parse
if not url:
return url
bits = urllib.parse.urlsplit(url, allow_fragments=True)
if not bits[0] and not bits[1]:
# don't replace the schema if there is not even a hostname.
return url
scheme = flask.current_app.config.get('PREFERRED_URL_SCHEME', 'https')
bits = (scheme, *bits[1:])
return urllib.parse.urlunsplit(bits)

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