6 January 2020 Updated 9 January 2020
by
Peter
This Flask website is multilanguage. The implementation is described in previous posts. So far all my translations were in the Python code and the HTML templates. On a few places I needed some translations in Javascript and did this by pulling this Javascript code inline in the HTML template. For example, for forms I needed:
e.target.setCustomValidity('Please fill out this field.');
I ...
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27 December 2019 Updated 27 December 2019
by
Peter
You created a Flask web application, it is running fine and using https. But is it secure enough? Did you do everything to protect your visitors, did you do everything to prevent malicious attacks?
A good way to proceed on this is to pentest your site. Penetration testing tools, or pen testing tools, can identifying security weaknesses. They identify vulnerabilities in the web application that can ...
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9 December 2019
by
Peter
Again another unexpected Docker issue. In a previous post I described why and how you must force Docker to use a subnet, to prevent sudden unexpected changes in the network with consequences like mail no longer working.
This post is about Docker not respecting firewall settings, at least when running Debian / Ubuntu and ufw (Uncomplicated Firewall). Docker does not tell you this, and exposes ports, ...
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27 November 2019 Updated 27 November 2019
by
Peter
I have an ISPConfig server with Docker applications. They use the host Postfix mail transfer agent (MTA) to deliver mail to the outside world. Before using the send mail function I have a check if Postfix can be accessed. This works fine. But suddenly mail was not sent. The log file contained error messages like:
2019-11-26 17:31:56,758 ERROR MailMessage - send_mail: self.error_message = sending message, ...
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24 November 2019 Updated 24 November 2019
by
Peter
For this website I am using Flask and SQLAlchemy without the Flask-SQLAlchemy extension. I need pagination for several pages. For example the home page holds the list of blogs and it should show a maximum of 12 items per page. It is not that difficult to implement. The home page view function requires a page_number that defaults to 1 if it not specified:
@pages_blueprint.route('/', defaults={'page_number': ...
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18 November 2019 Updated 19 November 2019
by
Peter
Probably many of you know only two mobile phone operating systems, iOS on Apple phones, and Googles Android on all other phones (some 80%). But there is also Ubuntu Touch (UT) originally developed by Canonical Ltd. and continued by UBports. I write a post about this because I am using UT on a Nexus 5 and wondered how difficult it would be to develop apps for it. When I discovered that you can use Python ...
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13 November 2019
by
Peter
While writing an application on my Docker platform I hit an unexpected problem, yes, another one ... This was the first time that I had to show the time on a page of a website running on Docker and it appeared that the time was UTC instead of local time. In the code I was just using the normal Python calls to get the time:
import datetime
...
now = datetime.datetime.now()
hour = now.hour
...
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13 November 2019 Updated 15 November 2019
by
Peter
How to implement Flask multilanguage is explained in the Flask docs, see links below. But this is just a starting point. You need deeper understanding of the process to handle special cases like falling back to a default language, language switching, and the 404 Page Not Found exception.
Assumptions
In the remainder of this post we are using a language code, 'lang_code', that is available in the ...
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18 October 2019 Updated 18 October 2019
by
Peter
I run a server with ISPConfig with some 50 sites. The sites are static or PHP. I am developing Python Flask applications now and also want to run them on the ISPConfig server. You can create virtual environments on the ISPConfig server and run your application from here. But some time ago I have chosen to use Docker for development, staging and production. It takes time to set this up ...
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9 October 2019 Updated 16 October 2019
by
Peter
The Flask application I am writing to run this website has all code in a single 'app'. I already did some reorganizing as I wanted full separation of frontend code and the administration code. Now it it is time for total separation, meaning making the frontend a Flask app and the admin another Flask app while both running in the same domain and both reside in the same project directory. Because we ...
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Welcome
This website is not finished. I started it because I wanted to learn Python, ORM and the framework Flask. And as I wanted to deploy it to my ISPConfig3 (Nginx + Mariadb) webserver I also had to dive into Docker. Read more
Most viewed:
- Two Flask apps, frontend and admin, on one domain using DispatcherMiddleware
- Adding url_for() links to Jinja templates of a Flask multilanguage website
- Docker containers suddenly using 192.168.0.0/16 instead of 172.17.0.0/16: services lost
- Developing Ubuntu Touch apps with Python using pyOtherSide
- ISPConfig: running a Python Flask Docker container as a jailed Shell User
- Refining multilanguage: adding language fallback as an option