Open Media Library Platform

Darwin/lib/python2.7/site-packages/twisted/mail/bounce.py

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+# -*- test-case-name: twisted.mail.test.test_bounce -*-
+#
+# Copyright (c) Twisted Matrix Laboratories.
+# See LICENSE for details.
+
+
+"""
+Support for bounce message generation.
+"""
+
+import StringIO
+import rfc822
+import time
+import os
+
+
+from twisted.mail import smtp
+
+BOUNCE_FORMAT = """\
+From: postmaster@%(failedDomain)s
+To: %(failedFrom)s
+Subject: Returned Mail: see transcript for details
+Message-ID: %(messageID)s
+Content-Type: multipart/report; report-type=delivery-status;
+    boundary="%(boundary)s"
+
+--%(boundary)s
+
+%(transcript)s
+
+--%(boundary)s
+Content-Type: message/delivery-status
+Arrival-Date: %(ctime)s
+Final-Recipient: RFC822; %(failedTo)s
+"""
+
+
+
+def generateBounce(message, failedFrom, failedTo, transcript=''):
+    """
+    Generate a bounce message for an undeliverable email message.
+
+    @type message: L{bytes}
+    @param message: The undeliverable message.
+
+    @type failedFrom: L{bytes}
+    @param failedFrom: The originator of the undeliverable message.
+
+    @type failedTo: L{bytes}
+    @param failedTo: The destination of the undeliverable message.
+
+    @type transcript: L{bytes}
+    @param transcript: An error message to include in the bounce message.
+
+    @rtype: 3-L{tuple} of (E{1}) L{bytes}, (E{2}) L{bytes}, (E{3}) L{bytes}
+    @return: The originator, the destination and the contents of the bounce
+        message.  The destination of the bounce message is the originator of
+        the undeliverable message.
+    """
+    if not transcript:
+        transcript = '''\
+I'm sorry, the following address has permanent errors: %(failedTo)s.
+I've given up, and I will not retry the message again.
+''' % vars()
+
+    boundary = "%s_%s_%s" % (time.time(), os.getpid(), 'XXXXX')
+    failedAddress = rfc822.AddressList(failedTo)[0][1]
+    failedDomain = failedAddress.split('@', 1)[1]
+    messageID = smtp.messageid(uniq='bounce')
+    ctime = time.ctime(time.time())
+
+    fp = StringIO.StringIO()
+    fp.write(BOUNCE_FORMAT % vars())
+    orig = message.tell()
+    message.seek(2, 0)
+    sz = message.tell()
+    message.seek(0, orig)
+    if sz > 10000:
+        while 1:
+            line = message.readline()
+            if len(line)<=1:
+                break
+            fp.write(line)
+    else:
+        fp.write(message.read())
+    return '', failedFrom, fp.getvalue()