From d80fed7941c769641899d79a6540436e95ba89e0 Mon Sep 17 00:00:00 2001
From: Benjamin Bertrand <benjamin.bertrand@esss.se>
Date: Tue, 13 Feb 2018 23:49:00 +0100
Subject: [PATCH] Force browser to reload changed static resources
Add a last modified query parameter to static resource.
This will force the browser to re-load resources (css, js...) after a new deploy.
---
app/main/views.py | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/app/main/views.py b/app/main/views.py
index 7cdb4d6..b98736b 100644
--- a/app/main/views.py
+++ b/app/main/views.py
@@ -9,7 +9,8 @@ This module implements the main blueprint.
:license: BSD 2-Clause, see LICENSE for more details.
"""
-from flask import Blueprint, render_template, jsonify
+import os
+from flask import Blueprint, render_template, jsonify, request, current_app
from flask_login import login_required
from .. import utils
@@ -34,6 +35,24 @@ def handle_csentry_error(error):
return response
+@bp.app_url_defaults
+def modified_static_file(endpoint, values):
+ """Add a last modified query parameter to static resource
+
+ Force the browser to invalidate the cache and reload resources
+ when files have changed
+
+ Inspired from http://flask.pocoo.org/snippets/40/ and
+ https://gist.github.com/Ostrovski/f16779933ceee3a9d181
+ """
+ if endpoint == 'static':
+ filename = values.get('filename')
+ if filename:
+ # The same static folder is used for all blueprints
+ file_path = os.path.join(current_app.static_folder, filename)
+ values['m'] = int(os.stat(file_path).st_mtime)
+
+
@bp.route('/')
@login_required
def index():
--
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