Expand 'my ip' to work for proxied requests

Adds a check for the HTTP_X_FORWARDED_FOR header, and uses the value
from the request if found.

app/routes.py

@@ -13,7 +13,7 @@ from app import app
 from app.models.config import Config
 from app.request import Request, TorError
 from app.utils.bangs import resolve_bang
-from app.utils.misc import read_config_bool
+from app.utils.misc import read_config_bool, get_client_ip
 from app.utils.results import add_ip_card
 from app.utils.results import bold_search_terms
 from app.utils.search import *
@@ -257,7 +257,7 @@ def search():
     # Feature to display IP address
     if search_util.check_kw_ip():
         html_soup = bsoup(str(response), 'html.parser')
-        response = add_ip_card(html_soup, request.remote_addr)
+        response = add_ip_card(html_soup, get_client_ip(request))
 
     return render_template(
         'display.html',

app/utils/misc.py

@@ -1,3 +1,4 @@
+from flask import Request
 import hashlib
 import os
 
@@ -15,3 +16,10 @@ def read_config_bool(var: str) -> bool:
     if val.isdigit():
         return bool(int(val))
     return False
+
+
+def get_client_ip(r: Request) -> str:
+    if r.environ.get('HTTP_X_FORWARDED_FOR') is None:
+        return r.environ['REMOTE_ADDR']
+    else:
+        return r.environ['HTTP_X_FORWARDED_FOR']