2017-08-07 21:50:31 +02:00
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from flask import url_for, abort
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import os
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def cachebust(app):
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@app.route('/static-<int:timestamp>/<path:filename>')
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def static_cachebust(timestamp, filename):
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path = os.path.join(app.static_folder, filename)
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2017-08-20 12:43:29 +02:00
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try:
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mtime = os.stat(path).st_mtime
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except Exception:
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return abort(404)
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2017-08-07 21:50:31 +02:00
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if abs(mtime - timestamp) > 1:
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abort(404)
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else:
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resp = app.view_functions['static'](filename=filename)
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resp.headers.set('cache-control', 'public, immutable, max-age=%s' % (60*60*24*365,))
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if 'expires' in resp.headers:
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resp.headers.remove('expires')
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return resp
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@app.context_processor
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def replace_url_for():
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return dict(url_for = cachebust_url_for)
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def cachebust_url_for(endpoint, **kwargs):
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if endpoint == 'static':
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endpoint = 'static_cachebust'
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path = os.path.join(app.static_folder, kwargs.get('filename'))
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kwargs['timestamp'] = int(os.stat(path).st_mtime)
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return url_for(endpoint, **kwargs)
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return cachebust_url_for
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