Add user agent check to frontend (#955)

* Add user agent check to frontend

* Remove auto generated comment.

public/__init__.py

@@ -1,8 +1,31 @@
-"""AUTO-GENERATED. DO NOT MODIFY"""
+"""Frontend for Home Assistant."""
 import os
+from user_agents import parse
+
+FAMILY_MIN_VERSION = {
+    'Chrome': 54,          # Object.values
+    'Chrome Mobile': 54,
+    'Firefox': 47,         # Object.values
+    'Firefox Mobile': 47,
+    'Opera': 41,           # Object.values
+    'Edge': 14,            # Array.prototype.includes added in 14
+    'Safari': 10,          # Many features not supported by 9
+}
 
 
 def where():
     """Return path to the frontend."""
     return os.path.dirname(__file__)
 
+
+def version(useragent):
+    """Get the version for given user agent."""
+    useragent = parse(useragent)
+
+    # on iOS every browser is a Safari which we support from version 11.
+    if useragent.os.family == 'iOS':
+        # Was >= 10, temp setting it to 12 to work around issue #11387
+        return useragent.os.version[0] >= 12
+
+    version = FAMILY_MIN_VERSION.get(useragent.browser.family)
+    return version and useragent.browser.version[0] >= version

setup.py

@@ -13,5 +13,8 @@ setup(name='home-assistant-frontend',
           'hass_frontend.*',
           'hass_frontend_es5.*'
       ]),
+      install_requires=[
+          'user-agents==1.1.0',
+      ],
       include_package_data=True,
       zip_safe=False)