Initial commit: Basic CLI and checks

Certo supports polling one or several hostnames.
Output can be human-readable or JSON.

certo/__main__.py

@@ -0,0 +1,36 @@
+"""
+Usage: certo [-v] [-j] <hostnames>... [-d DAYS|--days-to-expiration=DAYS] [-t SECONDS|--timeout=SECONDS]
+
+Options:
+   -v                                 Increase verbosity [default: False]
+   -j                                 Output in JSON format [default: False]
+   -d DAYS --days-to-expiration=DAYS  Warn about impending expiration if within DAYS of the cert's notAfter [default: 5]
+   -t SECONDS --timeout=SECONDS       Timeout for SSL Handshake [default: 5]
+"""
+import logging
+from pprint import pprint
+
+from docopt import docopt
+
+from certo.checks.hostname import check_host_certificate_expiration
+from certo.output import default_output, json_output
+
+if __name__ == "__main__":
+    args = docopt(__doc__)
+
+    output_as_json = args.get("-j")
+    if args.get("-v"):
+        logging.getLogger().setLevel(logging.INFO)
+    hostnames = args.get("<hostnames>")
+    days_to_expiration = int(args.get("--days-to-expiration"))
+
+    results = []
+
+    for hs in hostnames:
+        logging.info(f"Getting CERT from {hs}")
+        results.append(check_host_certificate_expiration(hs, days_to_expiration))
+
+    if output_as_json:
+        print(json_output(results))
+    else:
+        print(default_output(results))