Add new script to automate adlin mail challenge validation

adlin.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+import base64
+import email
+import email.policy
+import hashlib
+import hmac
+import json
+import os
+import re
+import sys
+import time
+import urllib.request
+
+def readmail(fp):
+    theEMail = fp.read()
+
+    msg = email.message_from_bytes(theEMail, policy=email.policy.default)
+    rp = msg.get("Return-Path") or "someone"
+    cnt = msg.get_content()
+
+    return msg, rp, cnt
+
+if __name__ == '__main__':
+    # Parse command line arguments
+    import argparse
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument('--url-token-validator', default="https://adlin.nemunai.re/api/recv-mail",
+                        help="URL to token-validator")
+
+    parser.add_argument('--secret', default="adelina",
+                        help="Secret used in token HMAC")
+
+    args = parser.parse_args()
+
+    msg, rp, cnt = readmail(sys.stdin.buffer)
+    hostnames = re.findall(r"<[^@]+@adlin-([^>]+)>", rp)
+    if len(hostnames) == 1:
+        h = hashlib.sha512()
+        h.update(cnt.encode())
+
+        req = urllib.request.Request(
+            url=args.url_token_validator,
+            method='POST',
+            headers={
+                "X-ADLIN-Authentication": base64.b64encode(hmac.digest(args.secret.encode(), str(int(time.mktime(time.localtime())/10)).encode(), hashlib.sha512)),
+            },
+            data=json.dumps({
+                "login": hostnames[0],
+                "token": h.hexdigest(),
+            }).encode(),
+        )
+        print("validating challenge for %s" % hostnames[0])
+        with urllib.request.urlopen(req) as f:
+            print(f.read().decode('utf-8'))