add Ahmia filter plugin for onion results

searx/plugins/__init__.py

@@ -28,6 +28,7 @@ from searx import logger, settings, static_path
 logger = logger.getChild('plugins')
 
 from searx.plugins import (oa_doi_rewrite,
+                           ahmia_filter,
                            hash_plugin,
                            https_rewrite,
                            infinite_scroll,
@@ -181,3 +182,7 @@ if 'enabled_plugins' in settings:
             plugin.default_on = True
         else:
             plugin.default_on = False
+
+# load tor specific plugins
+if settings['outgoing'].get('using_tor_proxy'):
+    plugins.register(ahmia_filter)

searx/plugins/ahmia_filter.py

@@ -0,0 +1,36 @@
+'''
+ SPDX-License-Identifier: AGPL-3.0-or-later
+'''
+
+from hashlib import md5
+from os.path import join
+from urllib.parse import urlparse
+from searx import searx_dir
+
+name = "Ahmia blacklist"
+description = "Filter out onion results that appear in Ahmia's blacklist. (See https://ahmia.fi/blacklist)"
+default_on = True
+preference_section = 'onions'
+
+ahmia_blacklist = None
+
+
+def get_ahmia_blacklist():
+    global ahmia_blacklist
+    if not ahmia_blacklist:
+        with open(join(join(searx_dir, "data"), "ahmia_blacklist.txt"), 'r') as f:
+            ahmia_blacklist = f.read().split()
+    return ahmia_blacklist
+
+
+def not_blacklisted(result):
+    if not result.get('is_onion'):
+        return True
+    result_hash = md5(urlparse(result.get('url')).hostname.encode()).hexdigest()
+    return result_hash not in get_ahmia_blacklist()
+
+
+def post_search(request, search):
+    filtered_results = list(filter(not_blacklisted, search.result_container._merged_results))
+    search.result_container._merged_results = filtered_results
+    return True