Use the index's url for the root url in Search

Instead of using the requests root url, as flask for some reason uses http by default, even if the instance is https. Enforces https only if HTTPS_ONLY is set.

app/utils/search.py

@@ -7,7 +7,7 @@ from app.request import gen_query
 from app.utils.results import get_first_link
 from bs4 import BeautifulSoup as bsoup
 from cryptography.fernet import Fernet, InvalidToken
-from flask import g
+from flask import g, url_for
 
 TOR_BANNER = '<hr><h1 style="text-align: center">You are using Tor</h1><hr>'
 CAPTCHA = 'div class="g-recaptcha"'
@@ -117,7 +117,11 @@ class Search:
         mobile = 'Android' in self.user_agent or 'iPhone' in self.user_agent
 
         content_filter = Filter(self.session_key,
-                                root_url=self.request.url_root,
+                                root_url=url_for('.index',
+                                            _external=True,
+                                            _scheme='https' 
+                                            if os.getenv("HTTPS_ONLY",False) 
+                                            else None),
                                 mobile=mobile,
                                 config=self.config,
                                 query=self.query)