# Copyright 2014 Eucalyptus Systems, Inc.
#
# Redistribution and use of this software in source and binary forms,
# with or without modification, are permitted provided that the following
# conditions are met:
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#   Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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from requestbuilder import Arg
from requestbuilder.exceptions import ArgumentError

from euca2ools.commands.s3 import S3Request


class HeadObject(S3Request):
    DESCRIPTION = 'Retrieve info about an object from the server'
    ARGS = [Arg('path', metavar='BUCKET/KEY', route_to=None,
                help='the object to retrieve info for (required)')]
    METHOD = 'HEAD'

    def configure(self):
        S3Request.configure(self)

        bucket, _, key = self.args['path'].partition('/')
        if not bucket:
            raise ArgumentError('path must contain a bucket name')
        if not key:
            raise ArgumentError('path must contain a key name')

    def preprocess(self):
        self.path = self.args['path']
