Patch by Humberto Diogenes for issue 2849, removing rfc822 module from

the standard library.  There are still a few cases of it in Demo and
Tools, but that's fine for now.  These should eventually get cleaned
up.  mimetools still has an import of rfc822, but mimetools itself
should go away.

Lib/cgi.py

@@ -32,13 +32,12 @@ __version__ = "2.6"
 # =======
 
 from operator import attrgetter
+from io import StringIO
 import sys
 import os
 import urllib
 import mimetools
-import rfc822
-import collections
-from io import StringIO
+import email.parser
 
 __all__ = ["MiniFieldStorage", "FieldStorage",
            "parse", "parse_qs", "parse_qsl", "parse_multipart",
@@ -404,7 +403,7 @@ class FieldStorage:
 
     disposition_options: dictionary of corresponding options
 
-    headers: a dictionary(-like) object (sometimes rfc822.Message or a
+    headers: a dictionary(-like) object (sometimes email.message.Message or a
         subclass thereof) containing *all* headers
 
     The class is subclassable, mostly for the purpose of overriding
@@ -633,13 +632,17 @@ class FieldStorage:
             raise ValueError('Invalid boundary in multipart form: %r' % (ib,))
         self.list = []
         klass = self.FieldStorageClass or self.__class__
-        part = klass(self.fp, {}, ib,
-                     environ, keep_blank_values, strict_parsing)
-        # Throw first part away
-        while not part.done:
-            headers = rfc822.Message(self.fp)
-            part = klass(self.fp, headers, ib,
-                         environ, keep_blank_values, strict_parsing)
+        parser = email.parser.FeedParser()
+        # Create bogus content-type header for proper multipart parsing
+        parser.feed('Content-Type: %s; boundary=%s\r\n\r\n' % (self.type, ib))
+        parser.feed(self.fp.read())
+        full_msg = parser.close()
+        # Get subparts
+        msgs = full_msg.get_payload()
+        for msg in msgs:
+            fp = StringIO(msg.get_payload())
+            part = klass(fp, msg, ib, environ, keep_blank_values,
+                         strict_parsing)
             self.list.append(part)
         self.skip_lines()
 

Lib/test/test_cgi.py

@@ -234,7 +234,7 @@ Content-Disposition: form-data; name="submit"
         self.assertEquals(len(fs.list), 4)
         expect = [{'name':'id', 'filename':None, 'value':'1234'},
                   {'name':'title', 'filename':None, 'value':''},
-                  {'name':'file', 'filename':'test.txt','value':'Testing 123.\n'},
+                  {'name':'file', 'filename':'test.txt', 'value':'Testing 123.'},
                   {'name':'submit', 'filename':None, 'value':' Add '}]
         for x in range(len(fs.list)):
             for k, exp in expect[x].items():