mirror of
https://github.com/not-kennethreitz/flask-sslify.git
synced 2026-06-05 15:00:21 +00:00
Jeffrey Gelens
59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
# -*- coding: utf-8 -*-
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from flask import request, redirect
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YEAR_IN_SECS = 31536000
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class SSLify(object):
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"""Secures your Flask App."""
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def __init__(self, app=None, age=YEAR_IN_SECS, subdomains=False, permanent=False):
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self.hsts_age = age
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self.hsts_include_subdomains = subdomains
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self.permanent = permanent
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if app is not None:
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self.init_app(self.app)
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def init_app(self, app):
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"""Configures the configured Flask app to enforce SSL."""
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self.app = app
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app.before_request(self.redirect_to_ssl)
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app.after_request(self.set_hsts_header)
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@property
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def hsts_header(self):
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"""Returns the proper HSTS policy."""
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hsts_policy = 'max-age={0}'.format(self.hsts_age)
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if self.hsts_include_subdomains:
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hsts_policy += '; includeSubDomains'
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return hsts_policy
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def redirect_to_ssl(self):
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"""Redirect incoming requests to HTTPS."""
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# Should we redirect?
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criteria = [
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request.is_secure,
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self.app.debug,
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request.headers.get('X-Forwarded-Proto', 'http') == 'https'
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]
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if not any(criteria):
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if request.url.startswith('http://'):
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url = request.url.replace('http://', 'https://', 1)
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code = 302
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if self.permanent:
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code = 301
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r = redirect(url, code=code)
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return r
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def set_hsts_header(self, response):
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"""Adds HSTS header to each response."""
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response.headers.setdefault('Strict-Transport-Security', self.hsts_header)
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return response
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