feat: PWA (#199)

* favicon path fix
* Add service worker
* Add routes
* Dynamic Manifest
* Workbox 5.1.2 updated

Author: officialpm

lms/lmsweb/manifest.py

@@ -0,0 +1,55 @@
+from lms.lmsweb.config import SERVER_ADDRESS
+
+
+MANIFEST = {
+    'name': "Python's Course LMS",
+    'short_name': 'LMS',
+    'theme_color': '#1290f4',
+    'background_color': '#2196f3',
+    'display': 'standalone',
+    'scope': SERVER_ADDRESS,
+    'start_url': SERVER_ADDRESS,
+    'icons': [
+        {
+            'src': '/static/avatar.jpg',
+            'type': 'image/jpeg',
+            'sizes': '512x512',
+        },
+        {
+            'src': '/static/icons/android-icon-36x36.png',
+            'sizes': '36x36',
+            'type': 'image/png',
+            'density': '0.75',
+        },
+        {
+            'src': '/static/icons/android-icon-48x48.png',
+            'sizes': '48x48',
+            'type': 'image/png',
+            'density': '1.0',
+        },
+        {
+            'src': '/static/icons/android-icon-72x72.png',
+            'sizes': '72x72',
+            'type': 'image/png',
+            'density': '1.5',
+        },
+        {
+            'src': '/static/icons/android-icon-96x96.png',
+            'sizes': '96x96',
+            'type': 'image/png',
+            'density': '2.0',
+        },
+        {
+            'src': '/static/icons/android-icon-144x144.png',
+            'sizes': '144x144',
+            'type': 'image/png',
+            'density': '3.0',
+        },
+        {
+            'src': '/static/icons/android-icon-192x192.png',
+            'sizes': '192x192',
+            'type': 'image/png',
+            'density': '4.0',
+        },
+    ],
+}

lms/lmsweb/views.py

@@ -1,4 +1,3 @@
-import os
 from functools import wraps
 from typing import Optional
 from urllib.parse import urljoin, urlparse
@@ -24,12 +23,14 @@
 )
 from lms.lmsweb import babel, routes, webapp
 from lms.lmsweb.config import LANGUAGES, LOCALE
+from lms.lmsweb.manifest import MANIFEST
 from lms.models import notifications, share_link, solutions, upload
 from lms.models.errors import LmsError, UploadError, fail
 from lms.utils.consts import RTL_LANGUAGES
 from lms.utils.files import get_language_name_by_extension
 from lms.utils.log import log
 
+
 login_manager = LoginManager()
 login_manager.init_app(webapp)
 login_manager.session_protection = 'strong'
@@ -132,12 +133,27 @@ def logout():
 @webapp.route('/favicon.ico')
 def favicon():
     return send_from_directory(
-        os.path.join(webapp.root_path, 'static'),
+        webapp.static_folder,
         'favicon.ico',
         mimetype='image/vnd.microsoft.icon',
     )
 
 
+@webapp.route('/manifest.json')
+def manifest():
+    return jsonify(MANIFEST)
+
+
+@webapp.route('/sw.js')
+def serviceWorker():
+    response = make_response(send_from_directory(
+        webapp.static_folder,
+        'sw.js',
+    ))
+    response.headers['Cache-Control'] = 'no-cache'
+    return response
+
+
 @webapp.before_request
 def banned_page():
     if (