Synnefo » Pithos

# Copyright 2011 GRNET S.A. All rights reserved.

# 

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

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#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

# 

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

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import logging

from django.http import HttpResponse

from pithos.api.faults import (Fault, BadRequest, ItemNotFound)

from pithos.api.util import (put_object_headers, update_manifest_meta,

    validate_modification_preconditions, validate_matching_preconditions,

    object_data_response, api_method)

logger = logging.getLogger(__name__)

def object_demux(request, v_account, v_container, v_object):

    if request.method == 'HEAD':

        return object_meta(request, v_account, v_container, v_object)

    elif request.method == 'GET':

        return object_read(request, v_account, v_container, v_object)

    else:

        return method_not_allowed(request)

@api_method('HEAD', user_required=False)

def object_meta(request, v_account, v_container, v_object):

    # Normal Response Codes: 204

    # Error Response Codes: serviceUnavailable (503),

    #                       itemNotFound (404),

    #                       badRequest (400)

    try:

        meta = request.backend.get_object_meta(request.user, v_account,

                                                v_container, v_object)

        public = request.backend.get_object_public(request.user, v_account,

                                                    v_container, v_object)

    except:

        raise ItemNotFound('Object does not exist')

    if not public:

        raise ItemNotFound('Object does not exist')

    update_manifest_meta(request, v_account, meta)

    response = HttpResponse(status=204)

    put_object_meta(response, meta, True)

    return response

@api_method('GET', user_required=False)

def object_read(request, v_account, v_container, v_object):

    # Normal Response Codes: 200, 206

    # Error Response Codes: serviceUnavailable (503),

    #                       rangeNotSatisfiable (416),

    #                       preconditionFailed (412),

    #                       itemNotFound (404),

    #                       badRequest (400),

    #                       notModified (304)

    try:

        meta = request.backend.get_object_meta(request.user, v_account,

                                                v_container, v_object)

        public = request.backend.get_object_public(request.user, v_account,

                                                    v_container, v_object)

    except:

        raise ItemNotFound('Object does not exist')

    if not public:

        raise ItemNotFound('Object does not exist')

    update_manifest_meta(request, v_account, meta)

    # Evaluate conditions.

    validate_modification_preconditions(request, meta)

    try:

        validate_matching_preconditions(request, meta)

    except NotModified:

        response = HttpResponse(status=304)

        response['ETag'] = meta['hash']

        return response

    sizes = []

    hashmaps = []

    if 'X-Object-Manifest' in meta:

        try:

            src_container, src_name = split_container_object_string('/' + meta['X-Object-Manifest'])

            objects = request.backend.list_objects(request.user, v_account,

                                src_container, prefix=src_name, virtual=False)

        except:

            raise ItemNotFound('Object does not exist')

        try:

            for x in objects:

                s, h = request.backend.get_object_hashmap(request.user,

                                        v_account, src_container, x[0], x[1])

                sizes.append(s)

                hashmaps.append(h)

        except:

            raise ItemNotFound('Object does not exist')

    else:

        try:

            s, h = request.backend.get_object_hashmap(request.user, v_account,

                                                        v_container, v_object)

            sizes.append(s)

            hashmaps.append(h)

        except:

            raise ItemNotFound('Object does not exist')

    return object_data_response(request, sizes, hashmaps, meta, True)

@api_method(user_required=False)

def method_not_allowed(request, **v_args):

    raise ItemNotFound('Object does not exist')