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
|
// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
package common
import (
"encoding/json"
"fmt"
"strings"
)
const (
spdxRefPrefix = "SPDXRef-"
documentRefPrefix = "DocumentRef-"
)
// ElementID represents the identifier string portion of an SPDX element
// identifier. DocElementID should be used for any attributes which can
// contain identifiers defined in a different SPDX document.
// ElementIDs should NOT contain the mandatory 'SPDXRef-' portion.
type ElementID string
// MarshalJSON returns an SPDXRef- prefixed JSON string
func (d ElementID) MarshalJSON() ([]byte, error) {
return json.Marshal(prefixElementId(d))
}
// UnmarshalJSON validates SPDXRef- prefixes and removes them when processing ElementIDs
func (d *ElementID) UnmarshalJSON(data []byte) error {
// SPDX identifier will simply be a string
idStr := string(data)
idStr = strings.Trim(idStr, "\"")
e, err := trimElementIdPrefix(idStr)
if err != nil {
return err
}
*d = e
return nil
}
// prefixElementId adds the SPDXRef- prefix to an element ID if it does not have one
func prefixElementId(id ElementID) string {
val := string(id)
if !strings.HasPrefix(val, spdxRefPrefix) {
return spdxRefPrefix + val
}
return val
}
// trimElementIdPrefix removes the SPDXRef- prefix from an element ID string or returns an error if it
// does not start with SPDXRef-
func trimElementIdPrefix(id string) (ElementID, error) {
// handle SPDXRef-
idFields := strings.SplitN(id, spdxRefPrefix, 2)
if len(idFields) != 2 {
return "", fmt.Errorf("failed to parse SPDX identifier '%s'", id)
}
e := ElementID(idFields[1])
return e, nil
}
// DocElementID represents an SPDX element identifier that could be defined
// in a different SPDX document, and therefore could have a "DocumentRef-"
// portion, such as Relationships and Annotations.
// ElementID is used for attributes in which a "DocumentRef-" portion cannot
// appear, such as a Package or File definition (since it is necessarily
// being defined in the present document).
// DocumentRefID will be the empty string for elements defined in the
// present document.
// DocElementIDs should NOT contain the mandatory 'DocumentRef-' or
// 'SPDXRef-' portions.
// SpecialID is used ONLY if the DocElementID matches a defined set of
// permitted special values for a particular field, e.g. "NONE" or
// "NOASSERTION" for the right-hand side of Relationships. If SpecialID
// is set, DocumentRefID and ElementRefID should be empty (and vice versa).
type DocElementID struct {
DocumentRefID string
ElementRefID ElementID
SpecialID string
}
// MarshalJSON converts the receiver into a slice of bytes representing a DocElementID in string form.
// This function is also used when marshalling to YAML
func (d DocElementID) MarshalJSON() ([]byte, error) {
if d.DocumentRefID != "" && d.ElementRefID != "" {
idStr := prefixElementId(d.ElementRefID)
return json.Marshal(fmt.Sprintf("%s%s:%s", documentRefPrefix, d.DocumentRefID, idStr))
} else if d.ElementRefID != "" {
return json.Marshal(prefixElementId(d.ElementRefID))
} else if d.SpecialID != "" {
return json.Marshal(d.SpecialID)
}
return []byte{}, fmt.Errorf("failed to marshal empty DocElementID")
}
// UnmarshalJSON takes a SPDX Identifier string parses it into a DocElementID struct.
// This function is also used when unmarshalling YAML
func (d *DocElementID) UnmarshalJSON(data []byte) (err error) {
// SPDX identifier will simply be a string
idStr := string(data)
idStr = strings.Trim(idStr, "\"")
// handle special cases
if idStr == "NONE" || idStr == "NOASSERTION" {
d.SpecialID = idStr
return nil
}
var idFields []string
// handle DocumentRef- if present
if strings.HasPrefix(idStr, documentRefPrefix) {
// strip out the "DocumentRef-" so we can get the value
idFields = strings.SplitN(idStr, documentRefPrefix, 2)
idStr = idFields[1]
// an SPDXRef can appear after a DocumentRef, separated by a colon
idFields = strings.SplitN(idStr, ":", 2)
d.DocumentRefID = idFields[0]
if len(idFields) == 2 {
idStr = idFields[1]
} else {
return nil
}
}
d.ElementRefID, err = trimElementIdPrefix(idStr)
return err
}
// TODO: add equivalents for LicenseRef- identifiers
// MakeDocElementID takes strings (without prefixes) for the DocumentRef-
// and SPDXRef- identifiers, and returns a DocElementID. An empty string
// should be used for the DocumentRef- portion if it is referring to the
// present document.
func MakeDocElementID(docRef string, eltRef string) DocElementID {
return DocElementID{
DocumentRefID: docRef,
ElementRefID: ElementID(eltRef),
}
}
// MakeDocElementSpecial takes a "special" string (e.g. "NONE" or
// "NOASSERTION" for the right side of a Relationship), nd returns
// a DocElementID with it in the SpecialID field. Other fields will
// be empty.
func MakeDocElementSpecial(specialID string) DocElementID {
return DocElementID{SpecialID: specialID}
}
// RenderElementID takes an ElementID and returns the string equivalent,
// with the SPDXRef- prefix reinserted.
func RenderElementID(eID ElementID) string {
return spdxRefPrefix + string(eID)
}
// RenderDocElementID takes a DocElementID and returns the string equivalent,
// with the SPDXRef- prefix (and, if applicable, the DocumentRef- prefix)
// reinserted. If a SpecialID is present, it will be rendered verbatim and
// DocumentRefID and ElementRefID will be ignored.
func RenderDocElementID(deID DocElementID) string {
if deID.SpecialID != "" {
return deID.SpecialID
}
prefix := ""
if deID.DocumentRefID != "" {
prefix = documentRefPrefix + deID.DocumentRefID + ":"
}
return prefix + spdxRefPrefix + string(deID.ElementRefID)
}
|
