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# Source code for mopidy.mpd.protocol.reflection

    from __future__ import absolute_import, unicode_literals

    from mopidy.mpd import exceptions, protocol

    @protocol.commands.add('config', list_command=False)
    def config(context):
        """
        *musicpd.org, reflection section:*

            ``config``

            Dumps configuration values that may be interesting for the client. This
            command is only permitted to "local" clients (connected via UNIX domain
            socket).
        """
        raise exceptions.MpdPermissionError(command='config')

    @protocol.commands.add('commands', auth_required=False)
    def commands(context):
        """
        *musicpd.org, reflection section:*

            ``commands``

            Shows which commands the current user has access to.
        """
        command_names = set()
        for name, handler in protocol.commands.handlers.items():
            if not handler.list_command:
                continue
            if context.dispatcher.authenticated or not handler.auth_required:
                command_names.add(name)

        return [
            ('command', command_name) for command_name in sorted(command_names)]

    @protocol.commands.add('decoders')
    def decoders(context):
        """
        *musicpd.org, reflection section:*

            ``decoders``

            Print a list of decoder plugins, followed by their supported
            suffixes and MIME types. Example response::

                plugin: mad
                suffix: mp3
                suffix: mp2
                mime_type: audio/mpeg
                plugin: mpcdec
                suffix: mpc

        *Clarifications:*

        - ncmpcpp asks for decoders the first time you open the browse view. By
          returning nothing and OK instead of an not implemented error, we avoid
          "Not implemented" showing up in the ncmpcpp interface, and we get the
          list of playlists without having to enter the browse interface twice.
        """
        return  # TODO

    @protocol.commands.add('notcommands', auth_required=False)
    def notcommands(context):
        """
        *musicpd.org, reflection section:*

            ``notcommands``

            Shows which commands the current user does not have access to.
        """
        command_names = set(['config', 'kill'])  # No permission to use
        for name, handler in protocol.commands.handlers.items():
            if not handler.list_command:
                continue
            if not context.dispatcher.authenticated and handler.auth_required:
                command_names.add(name)

        return [
            ('command', command_name) for command_name in sorted(command_names)]

    @protocol.commands.add('tagtypes')
    def tagtypes(context):
        """
        *musicpd.org, reflection section:*

            ``tagtypes``

            Shows a list of available song metadata.
        """
        pass  # TODO

    @protocol.commands.add('urlhandlers')
    def urlhandlers(context):
        """
        *musicpd.org, reflection section:*

            ``urlhandlers``

            Gets a list of available URL handlers.
        """
        return [
            ('handler', uri_scheme)
            for uri_scheme in context.core.uri_schemes.get()]

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