680185312

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Pull Request Pull Request #1291: WIP: Client refactor

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89.01

/tuf/client_rework/metadata_wrapper.py

#!/usr/bin/env python

# Copyright 2021, New York University and the TUF contributors
# SPDX-License-Identifier: MIT OR Apache-2.0

"""Metadata wrapper
"""
import time

from securesystemslib.keys import format_metadata_to_key

import tuf.exceptions
from tuf.api import metadata


class MetadataWrapper:
    """Helper classes extending or adding missing
    functionality to metadata API
    """

    def __init__(self, meta):
        self._meta = meta

    @classmethod
    def from_json_object(cls, tmp_file):
        """Loads JSON-formatted TUF metadata from a file object."""
        raw_data = tmp_file.read()
        # Use local scope import to avoid circular import errors
        # pylint: disable=import-outside-toplevel
        from tuf.api.serialization.json import JSONDeserializer

        deserializer = JSONDeserializer()
        meta = deserializer.deserialize(raw_data)
        return cls(meta=meta)

    @classmethod
    def from_json_file(cls, filename):
        """Loads JSON-formatted TUF metadata from a file."""
        meta = metadata.Metadata.from_file(filename)
        return cls(meta=meta)

    @property
    def signed(self):
        """
        TODO
        """
        return self._meta.signed

    @property
    def version(self):
        """
        TODO
        """
        return self._meta.signed.version

    def verify(self, keys, threshold):
        """
        TODO
        """
        verified = 0
        # 1.3. Check signatures
        for key in keys:
            self._meta.verify(key)
            verified += 1

        if verified < threshold:
            raise tuf.exceptions.InsufficientKeysError

    def persist(self, filename):
        """
        TODO
        """
        self._meta.to_file(filename)

    def expires(self, reference_time=None):
        """
        TODO
        """
        if reference_time is None:
            expires_timestamp = tuf.formats.datetime_to_unix_timestamp(
                self._meta.signed.expires
            )
            reference_time = int(time.time())

        if expires_timestamp < reference_time:
            raise tuf.exceptions.ExpiredMetadataError


class RootWrapper(MetadataWrapper):
    """
    TODO
    """

    def keys(self, role):
        """
        TODO
        """
        keys = []
        for keyid in self._meta.signed.roles[role]["keyids"]:
            key_metadata = self._meta.signed.keys[keyid]
            key, dummy = format_metadata_to_key(key_metadata)
            keys.append(key)

        return keys

    def threshold(self, role):
        """
        TODO
        """
        return self._meta.signed.roles[role]["threshold"]


class TimestampWrapper(MetadataWrapper):
    """
    TODO
    """

    @property
    def snapshot(self):
        """
        TODO
        """
        return self._meta.signed.meta["snapshot.json"]


class SnapshotWrapper(MetadataWrapper):
    """
    TODO
    """

    def role(self, name):
        """
        TODO
        """
        return self._meta.signed.meta[name + ".json"]


class TargetsWrapper(MetadataWrapper):
    """
    TODO
    """

    @property
    def targets(self):
        """
        TODO
        """
        return self._meta.signed.targets

    @property
    def delegations(self):
        """
        TODO
        """
        return self._meta.signed.delegations

    def keys(self, role):
        """
        TODO
        """
        keys = []
        for delegation in self._meta.signed.delegations["roles"]:
            if delegation["name"] == role:
                for keyid in delegation["keyids"]:
                    key_metadata = self._meta.signed.delegations["keys"][keyid]
                    key, dummy = format_metadata_to_key(key_metadata)
                    keys.append(key)
            return keys

    def threshold(self, role):
        """
        TODO
        """
        for delegation in self._meta.signed.delegations["roles"]:
            if delegation["name"] == role:
                return delegation["threshold"]

        return None

1	#!/usr/bin/env python
2
3	# Copyright 2021, New York University and the TUF contributors
4	# SPDX-License-Identifier: MIT OR Apache-2.0
5
6	"""Metadata wrapper	13✔
7	"""
8	import time	13✔
9
10	from securesystemslib.keys import format_metadata_to_key	13✔
11
12	import tuf.exceptions	13✔
13	from tuf.api import metadata	13✔
14
15
16	class MetadataWrapper:	13✔
17	"""Helper classes extending or adding missing
18	functionality to metadata API
19	"""
20
21	def __init__(self, meta):	13✔
22	self._meta = meta	13✔
23
24	@classmethod	13✔
25	def from_json_object(cls, tmp_file):	7✔
26	"""Loads JSON-formatted TUF metadata from a file object."""
27	raw_data = tmp_file.read()	13✔
28	# Use local scope import to avoid circular import errors
29	# pylint: disable=import-outside-toplevel
30	from tuf.api.serialization.json import JSONDeserializer	13✔
31
32	deserializer = JSONDeserializer()	13✔
33	meta = deserializer.deserialize(raw_data)	13✔
34	return cls(meta=meta)	13✔
35
36	@classmethod	13✔
37	def from_json_file(cls, filename):	7✔
38	"""Loads JSON-formatted TUF metadata from a file."""
39	meta = metadata.Metadata.from_file(filename)	13✔
40	return cls(meta=meta)	13✔
41
42	@property	13✔
43	def signed(self):	7✔
44	"""
45	TODO
46	"""
47	return self._meta.signed	13✔
48
49	@property	13✔
50	def version(self):	7✔
51	"""
52	TODO
53	"""
54	return self._meta.signed.version	13✔
55
56	def verify(self, keys, threshold):	13✔
57	"""
58	TODO
59	"""
60	verified = 0	13✔
61	# 1.3. Check signatures
62	for key in keys:	13✔
63	self._meta.verify(key)	13✔
64	verified += 1	13✔
65
66	if verified < threshold:	13!
NEW 67	raise tuf.exceptions.InsufficientKeysError	×
68
69	def persist(self, filename):	13✔
70	"""
71	TODO
72	"""
73	self._meta.to_file(filename)	13✔
74
75	def expires(self, reference_time=None):	13✔
76	"""
77	TODO
78	"""
79	if reference_time is None:	13!
80	expires_timestamp = tuf.formats.datetime_to_unix_timestamp(	13✔
81	self._meta.signed.expires
82	)
83	reference_time = int(time.time())	13✔
84
85	if expires_timestamp < reference_time:	13!
NEW 86	raise tuf.exceptions.ExpiredMetadataError	×
87
88
89	class RootWrapper(MetadataWrapper):	13✔
90	"""
91	TODO
92	"""
93
94	def keys(self, role):	13✔
95	"""
96	TODO
97	"""
98	keys = []	13✔
99	for keyid in self._meta.signed.roles[role]["keyids"]:	13✔
100	key_metadata = self._meta.signed.keys[keyid]	13✔
101	key, dummy = format_metadata_to_key(key_metadata)	13✔
102	keys.append(key)	13✔
103
104	return keys	13✔
105
106	def threshold(self, role):	13✔
107	"""
108	TODO
109	"""
110	return self._meta.signed.roles[role]["threshold"]	13✔
111
112
113	class TimestampWrapper(MetadataWrapper):	13✔
114	"""
115	TODO
116	"""
117
118	@property	13✔
119	def snapshot(self):	7✔
120	"""
121	TODO
122	"""
123	return self._meta.signed.meta["snapshot.json"]	13✔
124
125
126	class SnapshotWrapper(MetadataWrapper):	13✔
127	"""
128	TODO
129	"""
130
131	def role(self, name):	13✔
132	"""
133	TODO
134	"""
135	return self._meta.signed.meta[name + ".json"]	13✔
136
137
138	class TargetsWrapper(MetadataWrapper):	13✔
139	"""
140	TODO
141	"""
142
143	@property	13✔
144	def targets(self):	7✔
145	"""
146	TODO
147	"""
148	return self._meta.signed.targets	13✔
149
150	@property	13✔
151	def delegations(self):	7✔
152	"""
153	TODO
154	"""
155	return self._meta.signed.delegations	13✔
156
157	def keys(self, role):	13✔
158	"""
159	TODO
160	"""
161	keys = []	13✔
162	for delegation in self._meta.signed.delegations["roles"]:	13!
163	if delegation["name"] == role:	13!
164	for keyid in delegation["keyids"]:	13✔
165	key_metadata = self._meta.signed.delegations["keys"][keyid]	13✔
166	key, dummy = format_metadata_to_key(key_metadata)	13✔
167	keys.append(key)	13✔
168	return keys	13✔
169
170	def threshold(self, role):	13✔
171	"""
172	TODO
173	"""
174	for delegation in self._meta.signed.delegations["roles"]:	13!
175	if delegation["name"] == role:	13!
176	return delegation["threshold"]	13✔
177
NEW 178	return None	×

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