Dark/Light Theme feature added (#133)

apprise_api/core/middleware/theme.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2023 Chris Caron <lead2gold@gmail.com>
+# All rights reserved.
+#
+# This code is licensed under the MIT License.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files(the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions :
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+from django.conf import settings
+from core.themes import SiteTheme, SITE_THEMES
+import datetime
+
+
+class AutoThemeMiddleware:
+    """
+    Using the `theme=` variable, allow one to fix the language to either
+    'dark' or 'light'
+
+    """
+
+    def __init__(self, get_response):
+        """
+        Prepare our initialization
+        """
+        self.get_response = get_response
+
+    def __call__(self, request):
+        """
+        Define our middleware hook
+        """
+
+        # Our current theme
+        current_theme = \
+            request.COOKIES.get('t', request.COOKIES.get(
+                'theme', settings.APPRISE_DEFAULT_THEME))
+
+        # Extract our theme (fall back to our default if not set)
+        theme = request.GET.get("theme", current_theme).strip().lower()
+        theme = next((entry for entry in SITE_THEMES
+                     if entry.startswith(theme)), None) \
+            if theme else None
+
+        if theme not in SITE_THEMES:
+            # Fallback to default theme
+            theme = SiteTheme.LIGHT
+
+        # Set our theme to a cookie
+        request.theme = theme
+
+        # Set our next theme
+        request.next_theme = SiteTheme.LIGHT \
+            if theme == SiteTheme.DARK \
+            else SiteTheme.DARK
+
+        # Get our response object
+        response = self.get_response(request)
+
+        # Set our cookie
+        max_age = 365 * 24 * 60 * 60  # 1 year
+        expires = datetime.datetime.utcnow() + \
+            datetime.timedelta(seconds=max_age)
+
+        # Set our cookie
+        response.set_cookie('theme', theme, expires=expires.utctimetuple())
+
+        # return our response
+        return response