Async version of dkimverify to demonstrate asyncio.

dkimverify_async.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+# This software is provided 'as-is', without any express or implied
+# warranty.  In no event will the author be held liable for any damages
+# arising from the use of this software.
+#
+# Permission is granted to anyone to use this software for any purpose,
+# including commercial applications, and to alter it and redistribute it
+# freely, subject to the following restrictions:
+#
+# 1. The origin of this software must not be misrepresented; you must not
+#    claim that you wrote the original software. If you use this software
+#    in a product, an acknowledgment in the product documentation would be
+#    appreciated but is not required.
+# 2. Altered source versions must be plainly marked as such, and must not be
+#    misrepresented as being the original software.
+# 3. This notice may not be removed or altered from any source distribution.
+#
+# Copyright (c) 2008 Greg Hewgill http://hewgill.com
+#
+# This has been modified from the original software.
+# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
+
+from __future__ import print_function
+
+import sys
+import asyncio
+import dkim
+
+
+if sys.version_info[0] >= 3:
+    # Make sys.stdin a binary stream.
+    sys.stdin = sys.stdin.detach()
+
+message = sys.stdin.read()
+
+async def main():
+    res = await dkim.verify_async(message)
+    return res
+
+
+if __name__ == "__main__":
+    res = asyncio.run(main())
+    if not res:
+        print("signature verification failed")
+        sys.exit(1)
+    print("signature ok")
+