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Matches found for tag 'Flask': 16, showing 8

WTForms image picker widget for Flask with Bootstrap 4 without extra Javascript and CSS

24 January 2020 Updated 24 January 2020 by Peter

When you sign up for this website you are assigned an avatar image. Of course you can change the avatar in 'your account' and this is done using an image picker. Many image pickers examples can be found on the internet. But this is a Flask site including WTForms and I want the image picker to be generated by the wonderful Jinja macro I am using, see also link below, ok, I modified it a bit. With this ...
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Flask, Babel and Javascript language files

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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Flask site penetration tests: security headers and the session cookie

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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Using Python kwargs (keyword arguments) in Flask url_for() for pagination

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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Flask multilanguage processing, switching and the 404 Page Not Found exception

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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ISPConfig: running a Python Flask Docker container as a jailed Shell User

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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Two Flask apps, frontend and admin, on one domain using DispatcherMiddleware

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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Adding a contact form to a multilanguage page with content from a database

28 September 2019 Updated 11 October 2019 by Peter

Update 11 October 2019: I changed the addon-tag from '{% addon: ... %}' to '[[ addon: ... ]]'. The reason is that I wanted to be able to render the page text coming from the database, using render_template_string, and '{% ... %}' conflicts with Jinja2 tags. And yes, I do not want to implement a Jinja2 custom tag. What is difficult about implementing a contact page with a contact form with Flask ...
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