sitescripts: Script to extract domain-specific filters

sitescripts/crawler/bin/extract_filters.py

Index: sitescripts/crawler/bin/extract_filters.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/sitescripts/crawler/bin/extract_filters.py
@@ -0,0 +1,63 @@
+# coding: utf-8
+
+# This Source Code is subject to the terms of the Mozilla Public License
+# version 2.0 (the "License"). You can obtain a copy of the License at
+# http://mozilla.org/MPL/2.0/.
+
+import MySQLdb, os, re, sys
+from sitescripts.utils import get_config
+
+def parse_hide_filter(line):
+  match = re.search(r"^(.*?)##", line)
+  return {line: match.group(1)} if match else {}
+
+def parse_block_filter(line):
+  match = re.search(r"domain=(.*)", line)
+  if match:
+    domains = match.group(1).split("|")
+    filters = {}
+    for domain in domains:
+      filters[line] = domain;
+    return filters
+
+  match = re.search(r"^\|\|(.*?)[/\^]", line)
+  return {line: match.group(1)} if match else {}
+
+def remove_comment(line):
+  exclamation_index = line.find("!")
+  if exclamation_index != -1:
+    return line[:exclamation_index]
+  return line
+
+def extract_filters(filter_list_dir, domain_filter_files):
+  filters = {}
+
+  for filter_file in domain_filter_files:
+    is_hide_file = "hide" in filter_file
+    parse_filter = parse_hide_filter if is_hide_file else parse_block_filter
+    file_path = filter_list_dir + "/" + filter_file
+
+    try:
+      for line in open(file_path):
+        line = line.strip()
+        line = remove_comment(line)
+        filters.update(parse_filter(line))
+    except IOError:
+      print >>sys.stderr, "Unable to read filters from '%s'" % file_path
+
+  return filters
+
+def print_statements(filters):
+  query = "INSERT INTO crawler_filters (filter, domain) VALUES ('%s', '%s');"
+  for filter_line, domain in filters.iteritems():
+    escaped_filter = MySQLdb.escape_string(filter_line)
+    escaped_domain = MySQLdb.escape_string(domain)
+    print query % (escaped_filter, escaped_domain)
+
+if __name__ == "__main__":
+  config = get_config()
+  filter_list_dir = config.get("crawler", "filter_list_repository")
+  domain_filter_files = config.get("crawler", "domain_specific_filter_files")
+  domain_filter_file_list = re.split(r"\s*,\s*", domain_filter_files)
+  filters = extract_filters(filter_list_dir, domain_filter_file_list)
+  print_statements(filters)