extrinsics.py 文件源码

def mime_multipart(_, context, arg):
    """mime_multipart composes a MIME multipart string.

    Example:
        "UserData": {
          "Fn::Base64": {
            "CFPP::MimeMultipart": [
              ["text/x-shellscript", {"CFPP::FileToString": "userdata.sh"}],
              ["text/cloud-config", {"CFPP::FileToString": "cloud-init.yaml"}]
            ]
          }
        }
    """
    _raise_unless_mime_params(context, arg)
    mime_doc = MIMEMultipart()
    # set boundary explicitly so that they are stable based on path in the template.
    mime_doc.set_boundary("=" * 10 + hashlib.sha1(".".join(context)).hexdigest() + "=" * 3)
    for mime_type, contents in arg:
        sub_message = MIMEText(contents, contents, sys.getdefaultencoding())
        mime_doc.attach(sub_message)
    return mime_doc.as_string()