Unify safe URL checking to the one function, strengthen tests and filters (#3564)

changedetectionio/api/Watch.py

@@ -1,14 +1,12 @@
 import os
 
-from changedetectionio.strtobool import strtobool
-from changedetectionio.html_tools import is_safe_url
+from changedetectionio.validate_url import is_safe_valid_url
 
 from flask_expects_json import expects_json
 from changedetectionio import queuedWatchMetaData
 from changedetectionio import worker_handler
 from flask_restful import abort, Resource
 from flask import request, make_response, send_from_directory
-import validators
 from . import auth
 import copy
 
@@ -124,7 +122,7 @@ class Watch(Resource):
             return validation_error, 400
 
         # XSS etc protection
-        if request.json.get('url') and not is_safe_url(request.json.get('url')):
+        if request.json.get('url') and not is_safe_valid_url(request.json.get('url')):
             return "Invalid URL", 400
 
         watch.update(request.json)
@@ -232,9 +230,7 @@ class CreateWatch(Resource):
         json_data = request.get_json()
         url = json_data['url'].strip()
 
-        # If hosts that only contain alphanumerics are allowed ("localhost" for example)
-        allow_simplehost = not strtobool(os.getenv('BLOCK_SIMPLEHOSTS', 'False'))
-        if not validators.url(url, simple_host=allow_simplehost):
+        if not is_safe_valid_url(url):
             return "Invalid or unsupported URL", 400
 
         if json_data.get('proxy'):