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1# Copyright 2014 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5"""Module contains a simple base class for patching or updating a resource."""
6
7from cherrypy import tools
8
9import common
10from fake_device_server import common_util
11from fake_device_server import server_errors
12
13
14class ResourceMethod(object):
15    """A base class for methods that expose a simple PATCH/PUT mechanism."""
16
17    def __init__(self, resource):
18        """
19        @param resource: A resource delegate for storing devices.
20        """
21        self.resource = resource
22
23
24    @tools.json_out()
25    def PATCH(self, *args, **kwargs):
26        """Updates the given resource with the incoming json blob.
27
28        Format of this call is:
29        PATCH .../resource_id
30
31        Caller must define a json blob to patch the resource with.
32
33        Raises:
34            server_errors.HTTPError if the resource doesn't exist.
35        """
36        id, api_key, _ = common_util.parse_common_args(args, kwargs)
37        if not id:
38            server_errors.HTTPError(400, 'Missing id for operation')
39
40        data = common_util.parse_serialized_json()
41        return self.resource.update_data_val(id, api_key, data_in=data)
42
43
44    @tools.json_out()
45    def PUT(self, *args, **kwargs):
46        """Replaces the given resource with the incoming json blob.
47
48        Format of this call is:
49        PUT .../resource_id
50
51        Caller must define a json blob to patch the resource with.
52
53        Raises:
54            server_errors.HTTPError if the resource doesn't exist.
55        """
56        id, api_key, _ = common_util.parse_common_args(args, kwargs)
57        if not id:
58            server_errors.HTTPError(400, 'Missing id for operation')
59
60        data = common_util.parse_serialized_json()
61        return self.resource.update_data_val(
62                id, api_key, data_in=data, update=False)
63