fix issue #8807: adds a context parameter to POP3_SSL class.

Doc/library/poplib.rst

@@ -32,13 +32,19 @@ A single class is provided by the :mod:`poplib` module:
    be used).
 
 
-.. class:: POP3_SSL(host, port=POP3_SSL_PORT, keyfile=None, certfile=None[, timeout])
+.. class:: POP3_SSL(host, port=POP3_SSL_PORT, keyfile=None, certfile=None, timeout=None, context=None)
 
    This is a subclass of :class:`POP3` that connects to the server over an SSL
    encrypted socket.  If *port* is not specified, 995, the standard POP3-over-SSL
    port is used.  *keyfile* and *certfile* are also optional - they can contain a
    PEM formatted private key and certificate chain file for the SSL connection.
-   *timeout* works as in the :class:`POP3` constructor.
+   *timeout* works as in the :class:`POP3` constructor. *context* parameter is a
+   :class:`ssl.SSLContext` object which allows bundling SSL configuration
+   options, certificates and private keys into a single (potentially long-lived)
+   structure.
+
+   .. versionchanged:: 3.2
+      *context* parameter added.
 
 
 One exception is defined as an attribute of the :mod:`poplib` module:

Doc/whatsnew/3.2.rst

@@ -186,6 +186,13 @@ New, Improved, and Deprecated Modules
 
   (Contributed by Giampaolo Rodolà; :issue:`8866`.)
 
+* :class:`~poplib.POP3_SSL` class now accepts a *context* parameter, which is a
+  :class:`ssl.SSLContext` object allowing bundling SSL configuration options,
+  certificates and private keys into a single (potentially long-lived)
+  structure.
+
+  (Contributed by Giampaolo Rodolà; :issue:`8807`.)
+
 Multi-threading
 ===============
 

Lib/poplib.py

@@ -331,16 +331,26 @@ else:
         See the methods of the parent class POP3 for more documentation.
         """
 
-        def __init__(self, host, port=POP3_SSL_PORT,
+        def __init__(self, host, port=POP3_SSL_PORT, keyfile=None, certfile=None,
-        keyfile=None, certfile=None,
+                     timeout=socket._GLOBAL_DEFAULT_TIMEOUT, context=None):
-        timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
+            if context is not None and keyfile is not None:
+                raise ValueError("context and keyfile arguments are mutually "
+                                 "exclusive")
+            if context is not None and certfile is not None:
+                raise ValueError("context and certfile arguments are mutually "
+                                 "exclusive")
             self.keyfile = keyfile
             self.certfile = certfile
+            self.context = context
             POP3.__init__(self, host, port, timeout)
 
         def _create_socket(self, timeout):
             sock = POP3._create_socket(self, timeout)
-            return ssl.wrap_socket(sock, self.keyfile, self.certfile)
+            if self.context is not None:
+                sock = self.context.wrap_socket(sock)
+            else:
+                sock = ssl.wrap_socket(sock, self.keyfile, self.certfile)
+            return sock
 
     __all__.append("POP3_SSL")
 

Lib/test/test_poplib.py

@@ -122,6 +122,7 @@ class DummyPOP3Server(asyncore.dispatcher, threading.Thread):
         self.active = False
         self.active_lock = threading.Lock()
         self.host, self.port = self.socket.getsockname()[:2]
+        self.handler_instance = None
 
     def start(self):
         assert not self.active
@@ -145,8 +146,7 @@ class DummyPOP3Server(asyncore.dispatcher, threading.Thread):
 
     def handle_accept(self):
         conn, addr = self.accept()
-        self.handler = self.handler(conn)
+        self.handler_instance = self.handler(conn)
-        self.close()
 
     def handle_connect(self):
         self.close()
@@ -287,6 +287,23 @@ if hasattr(poplib, 'POP3_SSL'):
         def test__all__(self):
             self.assertIn('POP3_SSL', poplib.__all__)
 
+        def test_context(self):
+            ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
+            self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
+                              self.server.port, keyfile=CERTFILE, context=ctx)
+            self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
+                              self.server.port, certfile=CERTFILE, context=ctx)
+            self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
+                              self.server.port, keyfile=CERTFILE,
+                              certfile=CERTFILE, context=ctx)
+
+            self.client.quit()
+            self.client = poplib.POP3_SSL(self.server.host, self.server.port,
+                                          context=ctx)
+            self.assertIsInstance(self.client.sock, ssl.SSLSocket)
+            self.assertIs(self.client.sock.context, ctx)
+            self.assertTrue(self.client.noop().startswith(b'+OK'))
+
 
 class TestTimeouts(TestCase):
 

Misc/NEWS

@@ -93,6 +93,11 @@ Extensions
 Library
 -------
 
+- Issue #8807: poplib.POP3_SSL class now accepts a context parameter, which is a
+  ssl.SSLContext object allowing bundling SSL configuration options,
+  certificates and private keys into a single (potentially long-lived)
+  structure.
+
 - Issue #8866: parameters passed to socket.getaddrinfo can now be specified as
   single keyword arguments.