Sage Language Middleware for Django

This Django project provides middleware and utility classes to support multilingual applications through URL prefixes and cookies for language settings. The core feature is a custom CookieLocaleMiddleware, which dynamically manages user language preferences and redirects users to the appropriate language version of the site based on URL paths or cookies.

Features

• Dynamic Language Detection: Determines the preferred language by examining URL prefixes and cookies.
• Custom Middleware: CookieLocaleMiddleware extends Django's default LocaleMiddleware, enhancing support for multilingual content.
• URL Prefix Management: Utilities to add or remove language prefixes in URLs, supporting a clean and consistent URL structure.
• Customizable Language Settings: Integrates with Django's internationalization settings (LANGUAGES, LANGUAGE_CODE, etc.) for easy customization.
• Error Checking: Ensures proper configuration of language settings and middleware placement.

Project Structure

• middlewares/cookie.py: Contains CookieLocaleMiddleware to manage language preferences dynamically.
• utils/locale.py: Provides MultilingualService, a utility class for adding and removing language prefixes in URLs.
• views/locale.py: Implements SetLanguageView, allowing users to set their preferred language through a POST request.
• checks.py: Validates the configuration of middleware, language settings, and cookies.
• settings.py: Configures Django's settings, including LANGUAGES, LANGUAGE_CODE, and middleware setup.
• urls.py: Configures routes for language switching and i18n patterns.

Installation

Using pip

1. Create a Virtual Environment:

   python -m venv .venv

2. Activate the Virtual Environment:

   • On Windows:

     .venv\Scripts\activate

   • On macOS and Linux:

     source .venv/bin/activate

3. Install the Package:

   pip install python-sage-bbb

Using Poetry

1. Install Poetry: Follow the official installation instructions at the Poetry website.

2. Create a New Project (Optional):

   poetry new myproject
   cd myproject

3. Add the Package as a Dependency:

   poetry add python-sage-bbb

4. Activate the Virtual Environment:

   poetry shell

Configuration

1. Add sage_language to INSTALLED_APPS in settings.py:

   INSTALLED_APPS = [
       ...
       'sage_language',
   ]

2. Middleware Configuration: Ensure CookieLocaleMiddleware is added immediately after SessionMiddleware in the MIDDLEWARE setting:

   MIDDLEWARE = [
       'django.middleware.security.SecurityMiddleware',
       'django.contrib.sessions.middleware.SessionMiddleware',
       'sage_language.middlewares.cookie.CookieLocaleMiddleware',
       ...
   ]

3. Set Language Settings: Define supported languages, default language, and cookie names:

   LANGUAGES = [
       ('en', 'English'),
       ('fa', 'Farsi'),
       ('es', 'Spanish'),
   ]
   LANGUAGE_CODE = 'en'
   SAGE_LANGUAGE_COOKIE_NAME = "ivan_language"
   LANGUAGE_COOKIE_NAME = SAGE_LANGUAGE_COOKIE_NAME

4. Add URL Configuration for Language Switching: In urls.py, set up the language switching view:

   from sage_language.views import SetLanguageView
   urlpatterns = [
       path('set-language/', SetLanguageView.as_view(), name='set_language'),
       path("i18n/", include("django.conf.urls.i18n")),
   ]

Usage

1. Setting Language Preference: To change the language preference, make a POST request to /set-language/ with language and next parameters:

   • language: The desired language code (e.g., 'en', 'fa', 'es').
   • next: The URL to redirect to after setting the language.

2. URL Prefix Management: The middleware automatically adds or removes language prefixes from URLs based on the user’s selected language and cookie settings.

3. Automatic Language Redirection: If a user’s preferred language (stored in a cookie) differs from the language in the URL, the middleware will redirect them to the correct URL.

Notes

• Make sure to set USE_I18N, USE_L10N, and USE_TZ to True in settings.py for proper internationalization support.
• For production use, ensure SAGE_LANGUAGE_COOKIE_NAME and LANGUAGE_COOKIE_NAME are set to the same value for consistent cookie management.