Create generate_majestic-million.py

Pulls top 10K of the most referred to hosts from Majestic Million.

tools/generate_majestic-million.py

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+#!/usr/bin/env python3
+
+import datetime
+import logging
+import json
+import os
+import requests
+
+servers_url = 'http://downloads.majestic.com/majestic_million.csv'
+csv_path = 'majestic_million.csv'
+hostname_path = 'list.json'
+
+if os.path.isfile(csv_path):
+    logging.warning('Not erasing local csv file')
+else:
+    req = requests.get(servers_url)
+    with open(csv_path, 'wb') as fd:
+        for chunk in req.iter_content(4096):
+            fd.write(chunk)
+
+host_list = []
+with open(csv_path, newline='\n', encoding='utf-8', errors='replace') as csv_file:
+    top10k = csv_file.readlines()[:10000]
+
+version = int(datetime.date.today().strftime('%Y%m%d'))
+out_list = {}
+
+out_list['name'] = 'Top 10K websites from Majestic Million'
+out_list['version'] = version
+out_list['description'] = 'Event contains one or more entries from the top 10K of the most used websites (Majestic Million).'
+out_list['matching_attributes'] = ['hostname', 'domain']
+out_list['type'] = 'hostname'
+out_list['list'] = sorted(set(host_list))
+
+for hostname in top10k:
+    v = hostname.split(',')[2]
+    out_list['list'].append(v.rstrip())
+out_list['list'] = sorted(set(out_list['list']))
+with open(hostname_path, 'w', newline='\n') as hostname_file:
+    hostname_file.write(json.dumps(out_list, indent=2, sort_keys=False))