Fix incorrect config bool env var casting

Config boolean environment variables need to be cast to ints, since
they are set or unset using 0 and 1. Previously they were interpreted as
(pseudocode) read_var(name, default=False), which meant that setting
CONFIG_VAR=0 would enable that variable since Python reads environment
variables as strings, and '0' is truthy. This updates the previous logic
to (still pseudocode) int(read_var(name, default='0')).

Fixes #279

app/models/config.py

@@ -8,17 +8,19 @@ class Config:
         self.url = os.getenv('WHOOGLE_CONFIG_URL', '')
         self.lang_search = os.getenv('WHOOGLE_CONFIG_LANGUAGE', '')
         self.lang_interface = os.getenv('WHOOGLE_CONFIG_LANGUAGE', '')
-        self.style = open(os.path.join(app_config['STATIC_FOLDER'],
-                                       'css/variables.css')).read()
+        self.style = os.getenv(
+            'WHOOGLE_CONFIG_STYLE',
+            open(os.path.join(app_config['STATIC_FOLDER'],
+                              'css/variables.css')).read())
         self.ctry = os.getenv('WHOOGLE_CONFIG_COUNTRY', '')
-        self.safe = bool(os.getenv('WHOOGLE_CONFIG_SAFE', False))
-        self.dark = bool(os.getenv('WHOOGLE_CONFIG_DARK', False))
-        self.alts = bool(os.getenv('WHOOGLE_CONFIG_ALTS', False))
-        self.nojs = bool(os.getenv('WHOOGLE_CONFIG_NOJS', False))
-        self.tor = bool(os.getenv('WHOOGLE_CONFIG_TOR', False))
+        self.safe = int(os.getenv('WHOOGLE_CONFIG_SAFE', '0'))
+        self.dark = int(os.getenv('WHOOGLE_CONFIG_DARK', '0'))
+        self.alts = int(os.getenv('WHOOGLE_CONFIG_ALTS', '0'))
+        self.nojs = int(os.getenv('WHOOGLE_CONFIG_NOJS', '0'))
+        self.tor = int(os.getenv('WHOOGLE_CONFIG_TOR', '0'))
         self.near = os.getenv('WHOOGLE_CONFIG_NEAR', '')
-        self.new_tab = bool(os.getenv('WHOOGLE_CONFIG_NEW_TAB', False))
-        self.get_only = bool(os.getenv('WHOOGLE_CONFIG_GET_ONLY', False))
+        self.new_tab = int(os.getenv('WHOOGLE_CONFIG_NEW_TAB', '0'))
+        self.get_only = int(os.getenv('WHOOGLE_CONFIG_GET_ONLY', '0'))
         self.safe_keys = [
             'lang_search',
             'lang_interface',
@@ -26,10 +28,13 @@ class Config:
             'dark'
         ]
 
-        for key, value in kwargs.items():
-            if not value:
-                continue
-            setattr(self, key, value)
+        # Skip setting custom config if there isn't one
+        if kwargs:
+            for attr in self.get_mutable_attrs():
+                if attr not in kwargs.keys():
+                    setattr(self, attr, '')
+                else:
+                    setattr(self, attr, kwargs[attr])
 
     def __getitem__(self, name):
         return getattr(self, name)
@@ -43,6 +48,11 @@ class Config:
     def __contains__(self, name):
         return hasattr(self, name)
 
+    def get_mutable_attrs(self):
+        return {name: attr for name, attr in self.__dict__.items()
+                if not name.startswith("__")
+                and (type(attr) is int or type(attr) is str)}
+
     def is_safe_key(self, key) -> bool:
         """Establishes a group of config options that are safe to set
         in the url.

test/conftest.py

@@ -5,7 +5,7 @@ import random
 
 demo_config = {
     'near': random.choice(['Seattle', 'New York', 'San Francisco']),
-    'dark_mode': str(random.getrandbits(1)),
+    'dark': str(random.getrandbits(1)),
     'nojs': str(random.getrandbits(1)),
     'lang_interface': random.choice(app.config['LANGUAGES'])['value'],
     'lang_search': random.choice(app.config['LANGUAGES'])['value'],