Python Message.preamble方法代码示例

# 需要导入模块: from mailman.email.message import Message [as 别名]
# 或者: from mailman.email.message.Message import preamble [as 别名]

#.........这里部分代码省略.........
    # MIME multipart chroming the message?
    wrap = True
    if not msg.is_multipart() and msgtype == 'text/plain':
        # Save the RFC-3676 format parameters.
        format_param = msg.get_param('format')
        delsp = msg.get_param('delsp')
        # Save 'Content-Transfer-Encoding' header in case decoration fails.
        cte = msg.get('content-transfer-encoding')
        # header/footer is now in unicode.
        try:
            oldpayload = msg.get_payload(decode=True).decode(mcset)
            del msg['content-transfer-encoding']
            frontsep = endsep = ''
            if header and not header.endswith('\n'):
                frontsep = '\n'
            if footer and not oldpayload.endswith('\n'):
                endsep = '\n'
            payload = header + frontsep + oldpayload + endsep + footer
            # When setting the payload for the message, try various charset
            # encodings until one does not produce a UnicodeError.  We'll try
            # charsets in this order: the list's charset, the message's
            # charset, then utf-8.  It's okay if some of these are duplicates.
            for cset in (lcset, mcset, 'utf-8'):
                try:
                    msg.set_payload(payload.encode(cset), cset)
                except UnicodeError:
                    pass
                else:
                    if format_param:
                        msg.set_param('format', format_param)
                    if delsp:
                        msg.set_param('delsp', delsp)
                    wrap = False
                    break
        except (LookupError, UnicodeError):
            if cte:
                # Restore the original c-t-e.
                del msg['content-transfer-encoding']
                msg['Content-Transfer-Encoding'] = cte
    elif msg.get_content_type() == 'multipart/mixed':
        # The next easiest thing to do is just prepend the header and append
        # the footer as additional subparts
        payload = msg.get_payload()
        if not isinstance(payload, list):
            payload = [payload]
        if footer:
            mimeftr = MIMEText(footer.encode(lcset), 'plain', lcset)
            mimeftr['Content-Disposition'] = 'inline'
            payload.append(mimeftr)
        if header:
            mimehdr = MIMEText(header.encode(lcset), 'plain', lcset)
            mimehdr['Content-Disposition'] = 'inline'
            payload.insert(0, mimehdr)
        msg.set_payload(payload)
        wrap = False
    # If we couldn't add the header or footer in a less intrusive way, we can
    # at least do it by MIME encapsulation.  We want to keep as much of the
    # outer chrome as possible.
    if not wrap:
        return
    # Because of the way Message objects are passed around to process(), we
    # need to play tricks with the outer message -- i.e. the outer one must
    # remain the same instance.  So we're going to create a clone of the outer
    # message, with all the header chrome intact, then copy the payload to it.
    # This will give us a clone of the original message, and it will form the
    # basis of the interior, wrapped Message.
    inner = Message()
    # Which headers to copy?  Let's just do the Content-* headers
    for h, v in msg.items():
        if h.lower().startswith('content-'):
            inner[h] = v
    inner.set_payload(msg.get_payload())
    # For completeness
    inner.set_unixfrom(msg.get_unixfrom())
    inner.preamble = msg.preamble
    inner.epilogue = msg.epilogue
    # Don't copy get_charset, as this might be None, even if
    # get_content_charset isn't.  However, do make sure there is a default
    # content-type, even if the original message was not MIME.
    inner.set_default_type(msg.get_default_type())
    # BAW: HACK ALERT.
    if hasattr(msg, '__version__'):
        inner.__version__ = msg.__version__
    # Now, play games with the outer message to make it contain three
    # subparts: the header (if any), the wrapped message, and the footer (if
    # any).
    payload = [inner]
    if header:
        mimehdr = MIMEText(header.encode(lcset), 'plain', lcset)
        mimehdr['Content-Disposition'] = 'inline'
        payload.insert(0, mimehdr)
    if footer:
        mimeftr = MIMEText(footer.encode(lcset), 'plain', lcset)
        mimeftr['Content-Disposition'] = 'inline'
        payload.append(mimeftr)
    msg.set_payload(payload)
    del msg['content-type']
    del msg['content-transfer-encoding']
    del msg['content-disposition']
    msg['Content-Type'] = 'multipart/mixed'