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"""
This snippet from: http://flask.pocoo.org/snippets/56/
"Posted by Armin Ronacher on 2011-07-14"
"""
from datetime import timedelta
from functools import update_wrapper
from typing import Any
from flask import current_app, make_response, request
def crossdomain(
origin: Any = None,
methods: Any = None,
headers: Any = None,
max_age: Any = 21600,
attach_to_all: bool = True,
automatic_options: bool = True,
) -> Any:
if methods is not None:
methods = ", ".join(sorted(x.upper() for x in methods))
if headers is not None and not isinstance(headers, str):
headers = ", ".join(x.upper() for x in headers)
if not isinstance(origin, str):
origin = ", ".join(origin) # type: ignore
if isinstance(max_age, timedelta):
max_age = max_age.total_seconds()
def get_methods() -> Any:
if methods is not None:
return methods
options_resp = current_app.make_default_options_response()
return options_resp.headers["allow"]
def decorator(f: Any) -> Any:
def wrapped_function(*args, **kwargs) -> Any:
if automatic_options and request.method == "OPTIONS":
resp = current_app.make_default_options_response()
else:
resp = make_response(f(*args, **kwargs))
if not attach_to_all and request.method != "OPTIONS":
return resp
h = resp.headers
h["Access-Control-Allow-Origin"] = origin # type: ignore
h["Access-Control-Allow-Methods"] = get_methods()
h["Access-Control-Max-Age"] = str(max_age)
if headers is not None:
h["Access-Control-Allow-Headers"] = headers
return resp
f.provide_automatic_options = False
return update_wrapper(wrapped_function, f)
return decorator
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