Use binary files for email. Still some issues to work out with payloads.

Milter/test.py

@@ -4,9 +4,9 @@
 from __future__ import print_function
 import mime
 try:
-  from StringIO import StringIO
+  from io import BytesIO
 except:
-  from io import StringIO
+  from StringIO import StringIO as BytesIO
 import Milter
 
 Milter.NOREPLY = Milter.CONTINUE
@@ -155,20 +155,20 @@ class TestBase(object):
     rc = self.eoh()
     if rc != Milter.CONTINUE: return rc
     header,body = msg.as_bytes().split(b'\n\n',1)
-    bfp = StringIO(body)
+    bfp = BytesIO(body)
     while 1:
       buf = bfp.read(8192)
       if len(buf) == 0: break
       rc = self.body(buf)
       if rc != Milter.CONTINUE: return rc
     self._msg = msg
-    self._body = StringIO()
+    self._body = BytesIO()
     rc = self.eom()
     if self._bodyreplaced:
       body = self._body.getvalue()
-    self._body = StringIO()
+    self._body = BytesIO()
     self._body.write(header)
-    self._body.write('\n\n')
+    self._body.write(b'\n\n')
     self._body.write(body)
     return rc
 
@@ -177,7 +177,7 @@ class TestBase(object):
   # @param sender MAIL FROM
   # @param rcpts RCPT TO, multiple recipients may be supplied
   def feedMsg(self,fname,sender="spam@adv.com",*rcpts):
-    with open('test/'+fname,'r') as fp:
+    with open('test/'+fname,'rb') as fp:
       return self.feedFile(fp,sender,*rcpts)
 
   ## Call the connect and helo callbacks.

Milter/utils.py

@@ -212,11 +212,11 @@ def parse_header(val):
     for s,enc in h:
       if enc:
         try:
-          u.append(unicode(s,enc,'replace'))
+          u.append(s.decode(enc,'replace'))
         except LookupError:
-          u.append(unicode(s))
+          u.append(s.decode())
       else:
-        u.append(unicode(s))
+        u.append(s.decode())
     u = u''.join(u)
     for enc in ('us-ascii','iso-8859-1','utf-8'):
       try:

mime.py

@@ -95,16 +95,20 @@
 
 from __future__ import print_function
 try:
-  from StringIO import StringIO
+  from io import BytesIO, StringIO
 except:
-  from io import StringIO
+  from StringIO import StringIO 
+  BytesIO = StringIO
 import socket
 import Milter
 import zipfile
 
 import email
 from email.message import Message
-from email.generator import Generator
+try:
+  from email.generator import BytesGenerator
+except:
+  from email.generator import Generator as BytesGenerator
 from email.utils import quote
 
 if not getattr(Message,'as_bytes',None):
@@ -113,7 +117,7 @@ if not getattr(Message,'as_bytes',None):
 ## Return a list of filenames in a zip file.
 # Embedded zip files are recursively expanded.
 def zipnames(txt):
-  fp =  StringIO(txt)
+  fp =  BytesIO(txt)
   zipf = zipfile.ZipFile(fp,'r')
   names = []
   for nm in zipf.namelist():
@@ -124,7 +128,7 @@ def zipnames(txt):
 
 ## Fix multipart handling in email.Generator.
 #
-class MimeGenerator(Generator):
+class MimeGenerator(BytesGenerator):
     def _dispatch(self, msg):
         # Get the Content-Type: for the message, then try to dispatch to
         # self._handle_<maintype>_<subtype>().  If there's no handler for the
@@ -134,7 +138,7 @@ class MimeGenerator(Generator):
         if msg.is_multipart() and main.lower() != 'multipart':
           self._handle_multipart(msg)
         else:
-          Generator._dispatch(self,msg)
+          BytesGenerator._dispatch(self,msg)
 
 def unquote(s):
     """Remove quotes from a string."""
@@ -237,9 +241,9 @@ class MimeMessage(Message):
     g = MimeGenerator(file)
     g.flatten(self,unixfrom=unixfrom)
 
-  def as_string(self, unixfrom=False):
+  def as_bytes(self, unixfrom=False):
       "Return the entire formatted message as a string."
-      fp = StringIO()
+      fp = BytesIO()
       self.dump(fp,unixfrom=unixfrom)
       return fp.getvalue()
 
@@ -300,7 +304,7 @@ class MimeMessage(Message):
     return None
 
 def message_from_file(fp):
-  msg = email.message_from_file(fp,MimeMessage)
+  msg = email.message_from_binary_file(fp,MimeMessage)
   for part in msg.walk():
     part.modified = False
   assert not msg.ismodified()
@@ -509,7 +513,7 @@ def check_html(msg,savname=None):
       htmlfilter.close()
     #except sgmllib.SGMLParseError:
     except:
-      #mimetools.copyliteral(msg.get_payload(),open('debug.out','w')
+      mimetools.copyliteral(msg.get_payload(),open('debug.out','wb'))
       htmlfilter.close()
       hostname = socket.gethostname()
       msg.set_payload(
@@ -539,7 +543,7 @@ if __name__ == '__main__':
     return Milter.CONTINUE
 
   for fname in sys.argv[1:]:
-    fp = open(fname)
+    fp = open(fname,'rb')
     msg = message_from_file(fp)
     email.iterators._structure(msg)
     check_attachments(msg,_list_attach)

sample.py

@@ -8,9 +8,9 @@ from __future__ import print_function
 import sys
 import os
 try:
-  from StringIO import StringIO
+  from io import BytesIO
 except:
-  from io import StringIO
+  from StringIO import StringIO as BytesIO
 import mime
 import Milter
 import tempfile
@@ -41,7 +41,7 @@ class sampleMilter(Milter.Milter):
   def envfrom(self,f,*str):
     "start of MAIL transaction"
     self.log("mail from",f,str)
-    self.fp = StringIO()
+    self.fp = BytesIO()
     self.tempname = None
     self.mailfrom = f
     self.bodysize = 0
@@ -97,12 +97,12 @@ class sampleMilter(Milter.Milter):
     if lname in ('subject','x-mailer'):
       self.log('%s: %s' % (name,val))
     if self.fp:
-      self.fp.write("%s: %s\n" % (name,val))	# add header to buffer
+      self.fp.write(("%s: %s\n" % (name,val)).encode())	# add header to buffer
     return Milter.CONTINUE
 
   def eoh(self):
     if not self.fp: return Milter.TEMPFAIL	# not seen by envfrom
-    self.fp.write("\n")
+    self.fp.write(b'\n')
     self.fp.seek(0)
     # copy headers to a temp file for scanning the body
     headers = self.fp.getvalue()
@@ -144,7 +144,7 @@ class sampleMilter(Milter.Milter):
       msg.dump(out)
       out.seek(0)
       msg = mime.message_from_file(out)
-      fp = StringIO(msg.as_bytes().split(b'\n\n',1)[1])
+      fp = BytesIO(msg.as_bytes().split(b'\n\n',1)[1])
       while 1:
         buf = fp.read(8192)
         if len(buf) == 0: break

testmime.py

@@ -62,18 +62,18 @@ class MimeTestCase(unittest.TestCase):
     self.failUnless(plist[0] == 'name="Jim&Girlz.jpg"')
 
   def testParse(self,fname='samp1'):
-    msg = mime.message_from_file(open('test/'+fname,"r"))
+    msg = mime.message_from_file(open('test/'+fname,"rb"))
     self.failUnless(msg.ismultipart())
     parts = msg.get_payload()
     self.failUnless(len(parts) == 2)
     txt1 = parts[0].get_payload()
     self.failUnless(txt1.rstrip() == samp1_txt1,txt1)
-    msg = mime.message_from_file(open('test/missingboundary',"r"))
+    msg = mime.message_from_file(open('test/missingboundary',"rb"))
     # should get no exception as long as we don't try to parse
     # message attachments
     mime.defang(msg,scan_rfc822=False)
-    msg.dump(open('test/missingboundary.out','w'))
+    msg.dump(open('test/missingboundary.out','wb'))
-    msg = mime.message_from_file(open('test/missingboundary',"r"))
+    msg = mime.message_from_file(open('test/missingboundary',"rb"))
     try:
       mime.defang(msg)
       # python 2.4 doesn't get exceptions on missing boundaries, and
@@ -85,12 +85,12 @@ class MimeTestCase(unittest.TestCase):
   
   def testDefang(self,vname='virus1',part=1,
 	fname='LOVE-LETTER-FOR-YOU.TXT.vbs'):
-    msg = mime.message_from_file(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"rb"))
     mime.defang(msg,scan_zip=True)
     self.failUnless(msg.ismodified(),"virus not removed")
     oname = vname + '.out'
-    msg.dump(open('test/'+oname,"w"))
+    msg.dump(open('test/'+oname,"wb"))
-    msg = mime.message_from_file(open('test/'+oname,"r"))
+    msg = mime.message_from_file(open('test/'+oname,"rb"))
     txt2 = msg.get_payload()
     if type(txt2) == list:
       txt2 = txt2[part].get_payload()
@@ -110,11 +110,11 @@ class MimeTestCase(unittest.TestCase):
 
   # virus6 has no parts - the virus is directly inline
   def testDefang6(self,vname="virus6",fname='FAX20.exe'):
-    msg = mime.message_from_file(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"rb"))
     mime.defang(msg)
     oname = vname + '.out'
-    msg.dump(open('test/'+oname,"w"))
+    msg.dump(open('test/'+oname,"wb"))
-    msg = mime.message_from_file(open('test/'+oname,"r"))
+    msg = mime.message_from_file(open('test/'+oname,"rb"))
     self.failIf(msg.ismultipart())
     txt2 = msg.get_payload()
     self.failUnless(txt2 == mime.virus_msg % \
@@ -123,11 +123,11 @@ class MimeTestCase(unittest.TestCase):
   # honey virus has a sneaky ASP payload which is parsed correctly
   # by email package in python-2.2.2, but not by mime.MimeMessage or 2.2.1
   def testDefang7(self,vname="honey",fname='story[1].scr'):
-    msg = mime.message_from_file(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"rb"))
     mime.defang(msg)
     oname = vname + '.out'
-    msg.dump(open('test/'+oname,"w"))
+    msg.dump(open('test/'+oname,"wb"))
-    msg = mime.message_from_file(open('test/'+oname,"r"))
+    msg = mime.message_from_file(open('test/'+oname,"rb"))
     parts = msg.get_payload()
     txt2 = parts[1].get_payload()
     txt3 = parts[2].get_payload()
@@ -138,7 +138,7 @@ class MimeTestCase(unittest.TestCase):
 	  ('story[1].asp',hostname,None),txt3)
 
   def testParse2(self,fname="spam7"):
-    msg = mime.message_from_file(open('test/'+fname,"r"))
+    msg = mime.message_from_file(open('test/'+fname,"rb"))
     self.failUnless(msg.ismultipart())
     parts = msg.get_payload()
     self.failUnless(len(parts) == 2)
@@ -148,11 +148,11 @@ class MimeTestCase(unittest.TestCase):
   def testZip(self,vname="zip1",fname='zip.zip'):
     self.testDefang(vname,1,'zip.zip')
     # test scan_zip flag
-    msg = mime.message_from_file(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"rb"))
     mime.defang(msg,scan_zip=False)
     self.failIf(msg.ismodified())
     # test ignoring empty zip (often found in DSNs)
-    msg = mime.message_from_file(open('test/zip2','r'))
+    msg = mime.message_from_file(open('test/zip2','rb'))
     mime.defang(msg,scan_zip=True)
     self.failIf(msg.ismodified())
     # test corrupt zip (often an EXE named as a ZIP)
@@ -177,10 +177,10 @@ class MimeTestCase(unittest.TestCase):
 
   def testCheckAttach(self,fname="test1"):
     # test1 contains a very long filename
-    msg = mime.message_from_file(open('test/'+fname,'r'))
+    msg = mime.message_from_file(open('test/'+fname,'rb'))
     mime.defang(msg,scan_zip=True)
     self.failIf(msg.ismodified())
-    msg = mime.message_from_file(open('test/test2','r'))
+    msg = mime.message_from_file(open('test/test2','rb'))
     rc = mime.check_attachments(msg,self._chk_attach)
     self.assertEquals(self.filename,"7501'S FOR TWO GOLDEN SOURCES SHIPMENTS FOR TAX & DUTY PURPOSES ONLY.PDF")
     self.assertEquals(rc,Milter.CONTINUE)
@@ -205,7 +205,7 @@ if __name__ == '__main__':
     unittest.main()
   else:
     for fname in sys.argv[1:]:
-      fp = open(fname,'r')
+      fp = open(fname,'rb')
       msg = mime.message_from_file(fp)
       mime.defang(msg,scan_zip=True)
       print(msg.as_string())