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package types
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
)
// ExportRecord mirrors a line/event from plc.directory export stream.
type ExportRecord struct {
Seq uint64 `json:"seq"`
DID string `json:"did"`
CreatedAt string `json:"createdAt,omitempty"`
CID string `json:"cid,omitempty"`
Nullified bool `json:"nullified,omitempty"`
Operation json.RawMessage `json:"operation"`
}
type ParsedOperation struct {
DID string
CanonicalBytes []byte
Payload map[string]any
Sequence uint64
CID string
Prev string
RawRecord ExportRecord
}
func CanonicalizeJSON(raw []byte) ([]byte, error) {
trimmed := bytes.TrimSpace(raw)
if len(trimmed) == 0 {
return nil, fmt.Errorf("empty json payload")
}
if !json.Valid(trimmed) {
return nil, fmt.Errorf("invalid json payload")
}
var out bytes.Buffer
if err := json.Compact(&out, trimmed); err != nil {
return nil, fmt.Errorf("compact json: %w", err)
}
return out.Bytes(), nil
}
func ParseOperation(rec ExportRecord) (ParsedOperation, error) {
if rec.DID == "" {
return ParsedOperation{}, fmt.Errorf("missing DID")
}
canonical, err := CanonicalizeJSON(rec.Operation)
if err != nil {
return ParsedOperation{}, err
}
payload := map[string]any{}
if err := json.Unmarshal(canonical, &payload); err != nil {
return ParsedOperation{}, fmt.Errorf("decode operation: %w", err)
}
prev, _ := payload["prev"].(string)
cid := rec.CID
if cid == "" {
cid = ComputeDigestCID(canonical)
}
return ParsedOperation{
DID: rec.DID,
CanonicalBytes: canonical,
Payload: payload,
Sequence: rec.Seq,
CID: cid,
Prev: prev,
RawRecord: rec,
}, nil
}
func ComputeDigestCID(payload []byte) string {
sum := sha256.Sum256(payload)
return "sha256:" + hex.EncodeToString(sum[:])
}
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