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package state
import (
"encoding/json"
"fmt"
"github.com/Fuwn/plutia/internal/config"
"github.com/Fuwn/plutia/internal/storage"
"github.com/Fuwn/plutia/internal/types"
"time"
)
type Engine struct {
store storage.Store
mode string
}
func New(store storage.Store, mode string) *Engine {
return &Engine{store: store, mode: mode}
}
func (e *Engine) Apply(op types.ParsedOperation, blockRef *types.BlockRefV1) error {
existing, ok, err := e.store.GetState(op.DID)
if err != nil {
return fmt.Errorf("load state: %w", err)
}
var prior *types.StateV1
if ok {
prior = &existing
}
next, err := ComputeNextState(op, prior)
if err != nil {
return err
}
if pebbleStore, ok := e.store.(*storage.PebbleStore); ok {
includeOpRef := e.mode == config.ModeMirror && blockRef != nil
if err := pebbleStore.ApplyOperationBatch(next, blockRef, includeOpRef); err != nil {
return fmt.Errorf("apply operation batch: %w", err)
}
return nil
}
if err := e.store.PutState(next); err != nil {
return fmt.Errorf("put state: %w", err)
}
if err := e.store.SetChainHead(op.DID, op.Sequence); err != nil {
return fmt.Errorf("set chain head: %w", err)
}
if err := e.store.AddDIDSequence(op.DID, op.Sequence); err != nil {
return fmt.Errorf("append did sequence: %w", err)
}
if e.mode == config.ModeMirror && blockRef != nil {
if err := e.store.PutOpSeqRef(op.Sequence, *blockRef); err != nil {
return fmt.Errorf("put opseq ref: %w", err)
}
}
if err := e.store.SetGlobalSeq(op.Sequence); err != nil {
return fmt.Errorf("set global seq: %w", err)
}
return nil
}
func ComputeNextState(op types.ParsedOperation, existing *types.StateV1) (types.StateV1, error) {
if existing != nil && op.Sequence <= existing.LatestOpSeq {
if existing.ChainTipHash == op.CID {
return *existing, nil
}
return types.StateV1{}, fmt.Errorf("non-monotonic sequence for %s: got %d <= %d", op.DID, op.Sequence, existing.LatestOpSeq)
}
doc, err := materializeDIDDocument(op.DID, op.Payload)
if err != nil {
return types.StateV1{}, err
}
next := types.StateV1{
Version: 1,
DID: op.DID,
DIDDocument: doc,
ChainTipHash: op.CID,
LatestOpSeq: op.Sequence,
UpdatedAt: time.Now().UTC(),
}
next.RotationKeys = extractRotationKeys(op.Payload)
if len(next.RotationKeys) == 0 && existing != nil {
next.RotationKeys = append([]string(nil), existing.RotationKeys...)
}
return next, nil
}
func materializeDIDDocument(did string, payload map[string]any) ([]byte, error) {
for _, k := range []string{"did_document", "didDoc", "document", "didDocument"} {
if v, ok := payload[k]; ok {
b, err := json.Marshal(v)
if err != nil {
return nil, fmt.Errorf("marshal did document field %s: %w", k, err)
}
return types.CanonicalizeJSON(b)
}
}
if v, ok := payload["alsoKnownAs"]; ok {
doc := map[string]any{
"id": did,
"alsoKnownAs": v,
}
b, err := json.Marshal(doc)
if err != nil {
return nil, fmt.Errorf("marshal derived did document: %w", err)
}
return types.CanonicalizeJSON(b)
}
doc := map[string]any{"id": did}
if typ, _ := payload["type"].(string); typ == "plc_tombstone" || typ == "tombstone" {
doc["deactivated"] = true
}
if handle, ok := payload["handle"].(string); ok && handle != "" {
doc["alsoKnownAs"] = []string{"at://" + handle}
}
if serviceEndpoint, ok := payload["service"].(string); ok && serviceEndpoint != "" {
doc["service"] = []map[string]any{
{
"id": "#atproto_pds",
"type": "AtprotoPersonalDataServer",
"serviceEndpoint": serviceEndpoint,
},
}
}
if signingKey, ok := payload["signingKey"].(string); ok && signingKey != "" {
doc["verificationMethod"] = []map[string]any{
{
"id": "#atproto",
"type": "Multikey",
"controller": did,
"publicKeyMultibase": signingKey,
},
}
doc["authentication"] = []string{"#atproto"}
}
b, err := json.Marshal(doc)
if err != nil {
return nil, fmt.Errorf("marshal synthesized did document: %w", err)
}
return types.CanonicalizeJSON(b)
}
func extractRotationKeys(payload map[string]any) []string {
keys := make([]string, 0, 4)
seen := map[string]struct{}{}
add := func(v string) {
if v == "" {
return
}
if _, ok := seen[v]; ok {
return
}
seen[v] = struct{}{}
keys = append(keys, v)
}
if arr, ok := payload["rotationKeys"].([]any); ok {
for _, v := range arr {
if s, ok := v.(string); ok {
add(s)
}
}
}
if recovery, ok := payload["recoveryKey"].(string); ok {
add(recovery)
}
if signing, ok := payload["signingKey"].(string); ok {
add(signing)
}
return keys
}
|