Restructured valid params checking, added empty query redirect

app/request.py

@@ -10,12 +10,7 @@ MOBILE_UA = '{}/5.0 (Android 0; Mobile; rv:54.0) Gecko/54.0 {}/59.0'
 DESKTOP_UA = '{}/5.0 (X11; {} x86_64; rv:75.0) Gecko/20100101 {}/75.0'
 
 # Valid query params
-VALID_PARAMS = {
-    'tbs': '',
-    'tbm': '',
-    'start': '',
-    'near': ''
-}
+VALID_PARAMS = ['tbs', 'tbm', 'start', 'near']
 
 
 def gen_user_agent(normal_ua):
@@ -32,28 +27,29 @@ def gen_user_agent(normal_ua):
 
 
 def gen_query(query, args, near_city=None):
+    param_dict = {key: '' for key in VALID_PARAMS}
     # Use :past(hour/day/week/month/year) if available
     # example search "new restaurants :past month"
     if ':past' in query:
         time_range = str.strip(query.split(':past', 1)[-1])
-        VALID_PARAMS['tbs'] = '&tbs=qdr:' + str.lower(time_range[0])
+        param_dict['tbs'] = '&tbs=qdr:' + str.lower(time_range[0])
 
     # Ensure search query is parsable
     query = urlparse.quote(query)
 
     # Pass along type of results (news, images, books, etc)
     if 'tbm' in args:
-        VALID_PARAMS['tbm'] = '&tbm=' + args.get('tbm')
+        param_dict['tbm'] = '&tbm=' + args.get('tbm')
 
     # Get results page start value (10 per page, ie page 2 start val = 20)
     if 'start' in args:
-        VALID_PARAMS['start'] = '&start=' + args.get('start')
+        param_dict['start'] = '&start=' + args.get('start')
 
     # Search for results near a particular city, if available
     if near_city is not None:
-        VALID_PARAMS['near'] = '&near=' + urlparse.quote(near_city)
+        param_dict['near'] = '&near=' + urlparse.quote(near_city)
 
-    for val in VALID_PARAMS.values():
+    for val in param_dict.values():
         if not val or val is None:
             continue
         query += val

app/routes.py

@@ -42,6 +42,8 @@ def opensearch():
 def search():
     if request.method == 'GET':
         q = request.args.get('q')
+        if q is None:
+            return redirect('/')
         try:
             q = Fernet(app.secret_key).decrypt(q.encode()).decode()
         except InvalidToken: