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# Source code for slixmpp.plugins.xep_0131.stanza

    # Slixmpp: The Slick XMPP Library
    # Copyright (C) 2012 Nathanael C. Fritz, Lance J.T. Stout
    # This file is part of Slixmpp.
    # See the file LICENSE for copying permission.
    from slixmpp.xmlstream import ET, ElementBase

    class Headers(ElementBase):
        name = 'headers'
        namespace = 'http://jabber.org/protocol/shim'
        plugin_attrib = 'headers'
        interfaces = {'headers'}
        is_extension = True

        def get_headers(self):
            result = {}
            headers = self.xml.findall('{%s}header' % self.namespace)
            for header in headers:
                name = header.attrib.get('name', '')
                value = header.text
                if name in result:
                    if not isinstance(result[name], set):
                        result[name] = [result[name]]
                    else:
                        result[name] = []
                    result[name].add(value)
                else:
                    result[name] = value
            return result

        def set_headers(self, values):
            self.del_headers()
            for name in values:
                vals = values[name]
                if not isinstance(vals, (list, set)):
                    vals = [values[name]]
                for value in vals:
                    header = ET.Element('{%s}header' % self.namespace)
                    header.attrib['name'] = name
                    header.text = value
                    self.xml.append(header)

        def del_headers(self):
            headers = self.xml.findall('{%s}header' % self.namespace)
            for header in headers:
                self.xml.remove(header)