77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
from functools import wraps
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from quart import abort
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from quart import request
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from quart import session
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from quart_imp.auth import generate_csrf_token
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def include_csrf(
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session_key: str = "csrf", form_key: str = "csrf", abort_code: int = 401
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):
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"""
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A decorator that handles CSRF protection.
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:raw-html:`<br />`
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On a **GET** request, a CSRF token is generated and stored in the session key
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specified by the session_key parameter.
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On a **POST** request, the form_key specified is checked against the session_key
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specified.
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:raw-html:`<br />`
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| If they match, the request is allowed to continue.
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| If no match, the response will be abort(abort_code), default 401.
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:raw-html:`<br />`
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.. code-block::
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@bp.route("/admin", methods=["GET", "POST"])
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@include_csrf(session_key="csrf", form_key="csrf")
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def admin_page():
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...
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# You must pass in the CSRF token from the session into the template.
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# Then add <input type="hidden" name="csrf" value="{{ csrf }}"> to the form.
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return render_template("admin.html", csrf=session.get("csrf"))
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:raw-html:`<br />`
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-----
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:param session_key: The session key to store the CSRF token in.
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:param form_key: The form key to check against the session key.
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:param abort_code: The abort code to use if the CSRF check fails.
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:return: The decorated function, or abort(abort_code).
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"""
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def include_csrf_wrapper(func):
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@wraps(func)
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def inner(*args, **kwargs):
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if request.method == "GET":
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session[session_key] = generate_csrf_token()
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return func(*args, **kwargs)
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if request.method == "POST":
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_session_key = session.get(session_key)
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_form_key = request.form.get(form_key)
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if _form_key is None:
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return abort(abort_code)
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if _session_key is None:
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return abort(abort_code)
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if _session_key != _form_key:
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return abort(abort_code)
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return func(*args, **kwargs)
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return inner
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return include_csrf_wrapper
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