#14645: Generator now emits correct linesep for all parts.

Previously the parts of the message retained whatever linesep they had on
read, which means if the messages weren't read in univeral newline mode, the
line endings could well be inconsistent.  In general sending it via smtplib
would result in them getting fixed, but it is better to generate them
correctly to begin with.  Also, the new send_message method of smtplib does
not do the fixup, so that method is producing rfc-invalid output without this
fix.

2 files changed, 53 insertions, 4 deletions

diff --git a/Lib/email/generator.py b/Lib/email/generator.py
index d6acde3..cba0382 100644
--- a/Lib/email/generator.py
+++ b/Lib/email/generator.py
@@ -119,6 +119,19 @@ class Generator:
         # BytesGenerator overrides this to encode strings to bytes.
         return s
 
+    def _write_lines(self, lines):
+        # We have to transform the line endings.
+        if not lines:
+            return
+        lines = lines.splitlines(True)
+        for line in lines[:-1]:
+            self.write(line.rstrip('\r\n'))
+            self.write(self._NL)
+        laststripped = lines[-1].rstrip('\r\n')
+        self.write(laststripped)
+        if len(lines[-1])!=len(laststripped):
+            self.write(self._NL)
+
     def _write(self, msg):
         # We can't write the headers yet because of the following scenario:
         # say a multipart message includes the boundary string somewhere in
@@ -198,7 +211,7 @@ class Generator:
                 payload = msg.get_payload()
         if self._mangle_from_:
             payload = fcre.sub('>From ', payload)
-        self.write(payload)
+        self._write_lines(payload)
 
     # Default body handler
     _writeBody = _handle_text
@@ -237,7 +250,8 @@ class Generator:
                 preamble = fcre.sub('>From ', msg.preamble)
             else:
                 preamble = msg.preamble
-            self.write(preamble + self._NL)
+            self._write_lines(preamble)
+            self.write(self._NL)
         # dash-boundary transport-padding CRLF
         self.write('--' + boundary + self._NL)
         # body-part
@@ -259,7 +273,7 @@ class Generator:
                 epilogue = fcre.sub('>From ', msg.epilogue)
             else:
                 epilogue = msg.epilogue
-            self.write(epilogue)
+            self._write_lines(epilogue)
 
     def _handle_multipart_signed(self, msg):
         # The contents of signed parts has to stay unmodified in order to keep
@@ -393,7 +407,7 @@ class BytesGenerator(Generator):
         if _has_surrogates(msg._payload):
             if self._mangle_from_:
                 msg._payload = fcre.sub(">From ", msg._payload)
-            self.write(msg._payload)
+            self._write_lines(msg._payload)
         else:
             super(BytesGenerator,self)._handle_text(msg)
 
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index daed3b0..5e61a7b 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -68,6 +68,7 @@ class TestEmailBase(unittest.TestCase):
         with openfile(findfile(filename)) as fp:
             return email.message_from_file(fp)
 
+    maxDiff = None
 
 
 # Test various aspects of the Message class's API
@@ -2907,6 +2908,40 @@ multipart/report
             email.utils.make_msgid(domain='testdomain-string')[-19:],
             '@testdomain-string>')
 
+    def test_Generator_linend(self):
+        # Issue 14645.
+        with openfile('msg_26.txt', newline='\n') as f:
+            msgtxt = f.read()
+        msgtxt_nl = msgtxt.replace('\r\n', '\n')
+        msg = email.message_from_string(msgtxt)
+        s = StringIO()
+        g = email.generator.Generator(s)
+        g.flatten(msg)
+        self.assertEqual(s.getvalue(), msgtxt_nl)
+
+    def test_BytesGenerator_linend(self):
+        # Issue 14645.
+        with openfile('msg_26.txt', newline='\n') as f:
+            msgtxt = f.read()
+        msgtxt_nl = msgtxt.replace('\r\n', '\n')
+        msg = email.message_from_string(msgtxt_nl)
+        s = BytesIO()
+        g = email.generator.BytesGenerator(s)
+        g.flatten(msg, linesep='\r\n')
+        self.assertEqual(s.getvalue().decode('ascii'), msgtxt)
+
+    def test_BytesGenerator_linend_with_non_ascii(self):
+        # Issue 14645.
+        with openfile('msg_26.txt', 'rb') as f:
+            msgtxt = f.read()
+        msgtxt = msgtxt.replace(b'with attachment', b'fo\xf6')
+        msgtxt_nl = msgtxt.replace(b'\r\n', b'\n')
+        msg = email.message_from_bytes(msgtxt_nl)
+        s = BytesIO()
+        g = email.generator.BytesGenerator(s)
+        g.flatten(msg, linesep='\r\n')
+        self.assertEqual(s.getvalue(), msgtxt)
+
 
 # Test the iterator/generators
 class TestIterators(TestEmailBase):