/
record.go
248 lines (221 loc) · 5.38 KB
/
record.go
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
package cbor
import (
"context"
"fmt"
"github.com/textileio/go-threads/core/thread"
"github.com/ipfs/go-cid"
cbornode "github.com/ipfs/go-ipld-cbor"
"github.com/ipfs/go-ipld-format"
ic "github.com/libp2p/go-libp2p-core/crypto"
mh "github.com/multiformats/go-multihash"
"github.com/textileio/go-threads/core/net"
"github.com/textileio/go-threads/crypto"
pb "github.com/textileio/go-threads/net/pb"
)
func init() {
cbornode.RegisterCborType(record{})
}
// record defines the node structure of a record.
type record struct {
Block cid.Cid
Sig []byte
PubKey []byte
Prev cid.Cid `refmt:",omitempty"`
}
// CreateRecordConfig wraps all the elements needed for creating a new record.
type CreateRecordConfig struct {
Block format.Node
Prev cid.Cid
Key ic.PrivKey
PubKey thread.PubKey
ServiceKey crypto.EncryptionKey
}
// CreateRecord returns a new record from the given block and log private key.
func CreateRecord(ctx context.Context, dag format.DAGService, config CreateRecordConfig) (net.Record, error) {
pkb, err := config.PubKey.MarshalBinary()
if err != nil {
return nil, err
}
var payload []byte
if config.Prev.Defined() {
payload = append(config.Block.Cid().Bytes(), config.Prev.Bytes()...)
} else {
payload = pkb
}
sig, err := config.Key.Sign(payload)
if err != nil {
return nil, err
}
obj := &record{
Block: config.Block.Cid(),
Sig: sig,
PubKey: pkb,
Prev: config.Prev,
}
node, err := cbornode.WrapObject(obj, mh.SHA2_256, -1)
if err != nil {
return nil, err
}
coded, err := EncodeBlock(node, config.ServiceKey)
if err != nil {
return nil, err
}
if dag != nil {
if err = dag.Add(ctx, coded); err != nil {
return nil, err
}
}
return &Record{
Node: coded,
obj: obj,
block: config.Block,
}, nil
}
// GetRecord returns a record from the given cid.
func GetRecord(ctx context.Context, dag format.DAGService, id cid.Cid, key crypto.DecryptionKey) (net.Record, error) {
coded, err := dag.Get(ctx, id)
if err != nil {
return nil, err
}
return RecordFromNode(coded, key)
}
// RecordFromNode decodes a record from a node using the given key.
func RecordFromNode(coded format.Node, key crypto.DecryptionKey) (net.Record, error) {
obj := new(record)
node, err := DecodeBlock(coded, key)
if err != nil {
return nil, err
}
if err = cbornode.DecodeInto(node.RawData(), obj); err != nil {
return nil, err
}
return &Record{
Node: coded,
obj: obj,
}, nil
}
// RemoveRecord removes a record from the dag service.
func RemoveRecord(ctx context.Context, dag format.DAGService, rec net.Record) error {
return dag.Remove(ctx, rec.Cid())
}
// RecordToProto returns a proto version of a record for transport.
// Nodes are sent encrypted.
func RecordToProto(ctx context.Context, dag format.DAGService, rec net.Record) (*pb.Log_Record, error) {
block, err := rec.GetBlock(ctx, dag)
if err != nil {
return nil, err
}
event, ok := block.(*Event)
if !ok {
event, err = EventFromNode(block)
if err != nil {
return nil, err
}
}
header, err := event.GetHeader(ctx, dag, nil)
if err != nil {
return nil, err
}
body, err := event.GetBody(ctx, dag, nil)
if err != nil {
return nil, err
}
return &pb.Log_Record{
RecordNode: rec.RawData(),
EventNode: block.RawData(),
HeaderNode: header.RawData(),
BodyNode: body.RawData(),
}, nil
}
// Unmarshal returns a node from a serialized version that contains link data.
func RecordFromProto(rec *pb.Log_Record, key crypto.DecryptionKey) (net.Record, error) {
if key == nil {
return nil, fmt.Errorf("decryption key is required")
}
rnode, err := cbornode.Decode(rec.RecordNode, mh.SHA2_256, -1)
if err != nil {
return nil, err
}
enode, err := cbornode.Decode(rec.EventNode, mh.SHA2_256, -1)
if err != nil {
return nil, err
}
hnode, err := cbornode.Decode(rec.HeaderNode, mh.SHA2_256, -1)
if err != nil {
return nil, err
}
body, err := cbornode.Decode(rec.BodyNode, mh.SHA2_256, -1)
if err != nil {
return nil, err
}
decoded, err := DecodeBlock(rnode, key)
if err != nil {
return nil, err
}
robj := new(record)
if err = cbornode.DecodeInto(decoded.RawData(), robj); err != nil {
return nil, err
}
eobj := new(event)
if err = cbornode.DecodeInto(enode.RawData(), eobj); err != nil {
return nil, err
}
event := &Event{
Node: enode,
obj: eobj,
header: &EventHeader{
Node: hnode,
},
body: body,
}
return &Record{
Node: rnode,
obj: robj,
block: event,
}, nil
}
// Record is an IPLD node representing a record.
type Record struct {
format.Node
obj *record
block format.Node
}
func (r *Record) BlockID() cid.Cid {
return r.obj.Block
}
func (r *Record) GetBlock(ctx context.Context, dag format.DAGService) (format.Node, error) {
if r.block != nil {
return r.block, nil
}
var err error
r.block, err = dag.Get(ctx, r.obj.Block)
if err != nil {
return nil, err
}
return r.block, nil
}
func (r *Record) PrevID() cid.Cid {
return r.obj.Prev
}
func (r *Record) Sig() []byte {
return r.obj.Sig
}
func (r *Record) PubKey() []byte {
return r.obj.PubKey
}
func (r *Record) Verify(key ic.PubKey) error {
if r.block == nil {
return fmt.Errorf("block not loaded")
}
var payload []byte
if r.PrevID().Defined() {
payload = append(r.block.Cid().Bytes(), r.PrevID().Bytes()...)
} else {
payload = r.PubKey()
}
ok, err := key.Verify(payload, r.Sig())
if !ok || err != nil {
return fmt.Errorf("bad signature")
}
return nil
}