#14360: make encoders.encode_quopri work.

There were no tests for the encoders module.  encode_base64 worked
because it is the default and so got tested implicitly elsewhere, and
we use encode_7or8bit internally, so that worked, too.  I previously
fixed encode_noop, so this fix means that everythign in the encoders
module now works, hopefully correctly.  Also added an explicit test
for encode_base64.

Lib/email/encoders.py

@@ -20,7 +20,7 @@
 def _qencode(s):
     enc = _encodestring(s, quotetabs=True)
     # Must encode spaces, which quopri.encodestring() doesn't do
-    return enc.replace(' ', '=20')
+    return enc.replace(b' ', b'=20')
 
 
 def encode_base64(msg):
@@ -41,8 +41,12 @@ def encode_quopri(msg):
     Also, add an appropriate Content-Transfer-Encoding header.
     """
     orig = msg.get_payload()
+    if isinstance(orig, str):
+        # If it is a string, the model data may have binary data encoded in via
+        # surrogateescape.  Convert back to bytes so we can CTE encode it.
+        orig = orig.encode('ascii', 'surrogateescape')
     encdata = _qencode(orig)
-    msg.set_payload(encdata)
+    msg.set_payload(encdata.decode('ascii', 'surrogateescape'))
     msg['Content-Transfer-Encoding'] = 'quoted-printable'
 
 

Lib/test/test_email/test_email.py

@@ -1474,6 +1474,35 @@ def test_binary_body_with_encode_noop(self):
         self.assertEqual(msg.get_payload(), '\uFFFD' * len(bytesdata))
         self.assertEqual(msg2.get_payload(decode=True), bytesdata)
 
+    def test_binary_body_with_encode_quopri(self):
+        # Issue 14360.
+        bytesdata = b'\xfa\xfb\xfc\xfd\xfe\xff '
+        msg = MIMEApplication(bytesdata, _encoder=encoders.encode_quopri)
+        self.assertEqual(msg.get_payload(), '=FA=FB=FC=FD=FE=FF=20')
+        self.assertEqual(msg.get_payload(decode=True), bytesdata)
+        self.assertEqual(msg['Content-Transfer-Encoding'], 'quoted-printable')
+        s = BytesIO()
+        g = BytesGenerator(s)
+        g.flatten(msg)
+        wireform = s.getvalue()
+        msg2 = email.message_from_bytes(wireform)
+        self.assertEqual(msg.get_payload(), '=FA=FB=FC=FD=FE=FF=20')
+        self.assertEqual(msg2.get_payload(decode=True), bytesdata)
+        self.assertEqual(msg2['Content-Transfer-Encoding'], 'quoted-printable')
+
+    def test_binary_body_with_encode_base64(self):
+        bytesdata = b'\xfa\xfb\xfc\xfd\xfe\xff'
+        msg = MIMEApplication(bytesdata, _encoder=encoders.encode_base64)
+        self.assertEqual(msg.get_payload(), '+vv8/f7/\n')
+        self.assertEqual(msg.get_payload(decode=True), bytesdata)
+        s = BytesIO()
+        g = BytesGenerator(s)
+        g.flatten(msg)
+        wireform = s.getvalue()
+        msg2 = email.message_from_bytes(wireform)
+        self.assertEqual(msg.get_payload(), '+vv8/f7/\n')
+        self.assertEqual(msg2.get_payload(decode=True), bytesdata)
+
 
 # Test the basic MIMEText class
 class TestMIMEText(unittest.TestCase):