[fix] hostname_replace.py: don't stop replace URL in fields

This is a rewrite of the hostname_replace.py that:

- don't stop to replace URL in fields ('data_src', 'audio_src') if there isn't a
  'parsed_url',
- adds a comment about keep or remove a result from the result list
- adds a loop over ['data_src', 'audio_src'] instead of doubling code lines

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/plugins/hostname_replace.py

@@ -17,26 +17,30 @@ replacements = {re.compile(p): r for (p, r) in settings[plugin_id].items()} if p
 
 logger = logger.getChild(plugin_id)
 parsed = 'parsed_url'
+_url_fields = ['data_src', 'audio_src']
 
 
 def on_result(request, search, result):
-    if parsed not in result:
-        return True
+
     for (pattern, replacement) in replacements.items():
-        if pattern.search(result[parsed].netloc):
-            if not replacement:
-                return False
-            result[parsed] = result[parsed]._replace(netloc=pattern.sub(replacement, result[parsed].netloc))
-            result['url'] = urlunparse(result[parsed])
-        if result.get('data_src', False):
-            parsed_data_src = urlparse(result['data_src'])
-            if pattern.search(parsed_data_src.netloc):
-                parsed_data_src = parsed_data_src._replace(netloc=pattern.sub(replacement, parsed_data_src.netloc))
-                result['data_src'] = urlunparse(parsed_data_src)
-        if result.get('audio_src', False):
-            parsed_audio_src = urlparse(result['audio_src'])
-            if pattern.search(parsed_audio_src.netloc):
-                parsed_audio_src = parsed_audio_src._replace(netloc=pattern.sub(replacement, parsed_audio_src.netloc))
-                result['audio_src'] = urlunparse(parsed_audio_src)
+
+        if parsed in result:
+            if pattern.search(result[parsed].netloc):
+                # to keep or remove this result from the result list depends
+                # (only) on the 'parsed_url'
+                if not replacement:
+                    return False
+                result[parsed] = result[parsed]._replace(netloc=pattern.sub(replacement, result[parsed].netloc))
+                result['url'] = urlunparse(result[parsed])
+
+        for url_field in _url_fields:
+            if result.get(url_field):
+                url_src = urlparse(result[url_field])
+                if pattern.search(url_src.netloc):
+                    if not replacement:
+                        del result[url_field]
+                    else:
+                        url_src = url_src._replace(netloc=pattern.sub(replacement, url_src.netloc))
+                        result[url_field] = urlunparse(url_src)
 
     return True