forget-cancellare-vecchi-toot/lib/cachebust.py

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2017-08-07 21:50:31 +02:00
from flask import url_for, abort
import os
def cachebust(app):
@app.route('/static-<int:timestamp>/<path:filename>')
def static_cachebust(timestamp, filename):
path = os.path.join(app.static_folder, filename)
mtime = os.stat(path).st_mtime
if abs(mtime - timestamp) > 1:
abort(404)
else:
resp = app.view_functions['static'](filename=filename)
resp.headers.set('cache-control', 'public, immutable, max-age=%s' % (60*60*24*365,))
if 'expires' in resp.headers:
resp.headers.remove('expires')
return resp
@app.context_processor
def replace_url_for():
return dict(url_for = cachebust_url_for)
def cachebust_url_for(endpoint, **kwargs):
if endpoint == 'static':
endpoint = 'static_cachebust'
path = os.path.join(app.static_folder, kwargs.get('filename'))
kwargs['timestamp'] = int(os.stat(path).st_mtime)
return url_for(endpoint, **kwargs)
return cachebust_url_for