summaryrefslogtreecommitdiffstats
path: root/meta/lib/oe/spdx.py
blob: 4416194e0622998b8ea8fca8a1d231a620cb5441 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
#
# SPDX-License-Identifier: GPL-2.0-only
#

#
# This library is intended to capture the JSON SPDX specification in a type
# safe manner. It is not intended to encode any particular OE specific
# behaviors, see the sbom.py for that.
#
# The documented SPDX spec document doesn't cover the JSON syntax for
# particular configuration, which can make it hard to determine what the JSON
# syntax should be. I've found it is actually much simpler to read the official
# SPDX JSON schema which can be found here: https://github.com/spdx/spdx-spec
# in schemas/spdx-schema.json
#

import hashlib
import itertools
import json

SPDX_VERSION = "2.2"


#
# The following are the support classes that are used to implement SPDX object
#

class _Property(object):
    """
    A generic SPDX object property. The different types will derive from this
    class
    """

    def __init__(self, *, default=None):
        self.default = default

    def setdefault(self, dest, name):
        if self.default is not None:
            dest.setdefault(name, self.default)


class _String(_Property):
    """
    A scalar string property for an SPDX object
    """

    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    def set_property(self, attrs, name):
        def get_helper(obj):
            return obj._spdx[name]

        def set_helper(obj, value):
            obj._spdx[name] = value

        def del_helper(obj):
            del obj._spdx[name]

        attrs[name] = property(get_helper, set_helper, del_helper)

    def init(self, source):
        return source


class _Object(_Property):
    """
    A scalar SPDX object property of a SPDX object
    """

    def __init__(self, cls, **kwargs):
        super().__init__(**kwargs)
        self.cls = cls

    def set_property(self, attrs, name):
        def get_helper(obj):
            if not name in obj._spdx:
                obj._spdx[name] = self.cls()
            return obj._spdx[name]

        def set_helper(obj, value):
            obj._spdx[name] = value

        def del_helper(obj):
            del obj._spdx[name]

        attrs[name] = property(get_helper, set_helper)

    def init(self, source):
        return self.cls(**source)


class _ListProperty(_Property):
    """
    A list of SPDX properties
    """

    def __init__(self, prop, **kwargs):
        super().__init__(**kwargs)
        self.prop = prop

    def set_property(self, attrs, name):
        def get_helper(obj):
            if not name in obj._spdx:
                obj._spdx[name] = []
            return obj._spdx[name]

        def del_helper(obj):
            del obj._spdx[name]

        attrs[name] = property(get_helper, None, del_helper)

    def init(self, source):
        return [self.prop.init(o) for o in source]


class _StringList(_ListProperty):
    """
    A list of strings as a property for an SPDX object
    """

    def __init__(self, **kwargs):
        super().__init__(_String(), **kwargs)


class _ObjectList(_ListProperty):
    """
    A list of SPDX objects as a property for an SPDX object
    """

    def __init__(self, cls, **kwargs):
        super().__init__(_Object(cls), **kwargs)


class MetaSPDXObject(type):
    """
    A metaclass that allows properties (anything derived from a _Property
    class) to be defined for a SPDX object
    """
    def __new__(mcls, name, bases, attrs):
        attrs["_properties"] = {}

        for key in attrs.keys():
            if isinstance(attrs[key], _Property):
                prop = attrs[key]
                attrs["_properties"][key] = prop
                prop.set_property(attrs, key)

        return super().__new__(mcls, name, bases, attrs)


class SPDXObject(metaclass=MetaSPDXObject):
    """
    The base SPDX object; all SPDX spec classes must derive from this class
    """
    def __init__(self, **d):
        self._spdx = {}

        for name, prop in self._properties.items():
            prop.setdefault(self._spdx, name)
            if name in d:
                self._spdx[name] = prop.init(d[name])

    def serializer(self):
        return self._spdx

    def __setattr__(self, name, value):
        if name in self._properties or name == "_spdx":
            super().__setattr__(name, value)
            return
        raise KeyError("%r is not a valid SPDX property" % name)

#
# These are the SPDX objects implemented from the spec. The *only* properties
# that can be added to these objects are ones directly specified in the SPDX
# spec, however you may add helper functions to make operations easier.
#
# Defaults should *only* be specified if the SPDX spec says there is a certain
# required value for a field (e.g. dataLicense), or if the field is mandatory
# and has some sane "this field is unknown" (e.g. "NOASSERTION")
#

class SPDXAnnotation(SPDXObject):
    annotationDate = _String()
    annotationType = _String()
    annotator = _String()
    comment = _String()

class SPDXChecksum(SPDXObject):
    algorithm = _String()
    checksumValue = _String()


class SPDXRelationship(SPDXObject):
    spdxElementId = _String()
    relatedSpdxElement = _String()
    relationshipType = _String()
    comment = _String()


class SPDXExternalReference(SPDXObject):
    referenceCategory = _String()
    referenceType = _String()
    referenceLocator = _String()


class SPDXPackageVerificationCode(SPDXObject):
    packageVerificationCodeValue = _String()
    packageVerificationCodeExcludedFiles = _StringList()


class SPDXPackage(SPDXObject):
    name = _String()
    SPDXID = _String()
    versionInfo = _String()
    downloadLocation = _String(default="NOASSERTION")
    packageSupplier = _String(default="NOASSERTION")
    homepage = _String()
    licenseConcluded = _String(default="NOASSERTION")
    licenseDeclared = _String(default="NOASSERTION")
    summary = _String()
    description = _String()
    sourceInfo = _String()
    copyrightText = _String(default="NOASSERTION")
    licenseInfoFromFiles = _StringList(default=["NOASSERTION"])
    externalRefs = _ObjectList(SPDXExternalReference)
    packageVerificationCode = _Object(SPDXPackageVerificationCode)
    hasFiles = _StringList()
    packageFileName = _String()
    annotations = _ObjectList(SPDXAnnotation)


class SPDXFile(SPDXObject):
    SPDXID = _String()
    fileName = _String()
    licenseConcluded = _String(default="NOASSERTION")
    copyrightText = _String(default="NOASSERTION")
    licenseInfoInFiles = _StringList(default=["NOASSERTION"])
    checksums = _ObjectList(SPDXChecksum)
    fileTypes = _StringList()


class SPDXCreationInfo(SPDXObject):
    created = _String()
    licenseListVersion = _String()
    comment = _String()
    creators = _StringList()


class SPDXExternalDocumentRef(SPDXObject):
    externalDocumentId = _String()
    spdxDocument = _String()
    checksum = _Object(SPDXChecksum)


class SPDXExtractedLicensingInfo(SPDXObject):
    name = _String()
    comment = _String()
    licenseId = _String()
    extractedText = _String()


class SPDXDocument(SPDXObject):
    spdxVersion = _String(default="SPDX-" + SPDX_VERSION)
    dataLicense = _String(default="CC0-1.0")
    SPDXID = _String(default="SPDXRef-DOCUMENT")
    name = _String()
    documentNamespace = _String()
    creationInfo = _Object(SPDXCreationInfo)
    packages = _ObjectList(SPDXPackage)
    files = _ObjectList(SPDXFile)
    relationships = _ObjectList(SPDXRelationship)
    externalDocumentRefs = _ObjectList(SPDXExternalDocumentRef)
    hasExtractedLicensingInfos = _ObjectList(SPDXExtractedLicensingInfo)

    def __init__(self, **d):
        super().__init__(**d)

    def to_json(self, f, *, sort_keys=False, indent=None, separators=None):
        class Encoder(json.JSONEncoder):
            def default(self, o):
                if isinstance(o, SPDXObject):
                    return o.serializer()

                return super().default(o)

        sha1 = hashlib.sha1()
        for chunk in Encoder(
            sort_keys=sort_keys,
            indent=indent,
            separators=separators,
        ).iterencode(self):
            chunk = chunk.encode("utf-8")
            f.write(chunk)
            sha1.update(chunk)

        return sha1.hexdigest()

    @classmethod
    def from_json(cls, f):
        return cls(**json.load(f))

    def add_relationship(self, _from, relationship, _to, *, comment=None):
        if isinstance(_from, SPDXObject):
            from_spdxid = _from.SPDXID
        else:
            from_spdxid = _from

        if isinstance(_to, SPDXObject):
            to_spdxid = _to.SPDXID
        else:
            to_spdxid = _to

        r = SPDXRelationship(
            spdxElementId=from_spdxid,
            relatedSpdxElement=to_spdxid,
            relationshipType=relationship,
        )

        if comment is not None:
            r.comment = comment

        self.relationships.append(r)

    def find_by_spdxid(self, spdxid):
        for o in itertools.chain(self.packages, self.files):
            if o.SPDXID == spdxid:
                return o
        return None

    def find_external_document_ref(self, namespace):
        for r in self.externalDocumentRefs:
            if r.spdxDocument == namespace:
                return r
        return None