Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 0a8a866145
Fetching contributors…

Cannot retrieve contributors at this time

60 lines (42 sloc) 1.607 kb
# -*- coding: utf-8 -*-
from flask import request, redirect
YEAR_IN_SECS = 31536000
class SSLify(object):
"""Secures your Flask App."""
def __init__(self, app, age=YEAR_IN_SECS, subdomains=False):
if app is not None:
self.app = app
self.hsts_age = age
self.hsts_include_subdomains = subdomains
self.init_app(self.app)
else:
self.app = None
def init_app(self, app):
"""Configures the configured Flask app to enforce SSL."""
app.before_request(self.redirect_to_ssl)
app.after_request(self.set_hsts_header)
@property
def hsts_header(self):
"""Returns the proper HSTS policy."""
hsts_policy = 'max-age={0}'.format(self.hsts_age)
if self.hsts_include_subdomains:
hsts_policy += '; includeSubDomains'
return hsts_policy
def redirect_to_ssl(self):
"""Redirect incoming requests to HTTPS."""
# Should we redirect?
criteria = [
request.is_secure,
self.app.debug,
request.headers.get('X-Forwarded-Proto', 'http') == 'https'
]
if not any(criteria):
if request.url.startswith('http://'):
url = request.url.replace('http://', 'https://', 1)
r = redirect(url)
return r
def set_hsts_header(self, response):
"""Adds HSTS header to each response."""
if request.is_secure:
response.headers.setdefault('Strict-Transport-Security', self.hsts_header)
return response
Jump to Line
Something went wrong with that request. Please try again.