此範例確定性地派生一個 Ed25519 密鑰，建構完整的 Registry 和簽署的 Command，並提供類型化的記憶體適配器。一個sync.Mutex保護共享的權威地圖。
Lookup和AppendOrReturnExisting獨立取得；當互斥體檢查並發獲勝者並有條件追加時，它使
AppendOrReturnExisting
成為原子。該協議需要權威查找和原子追加或返回現有行為，而不是跨越兩個調用的一個事務。固定種子是演示材料，絕不能在範例之外使用。
package main
import (
"bytes"
"crypto/ed25519"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"sync"
missionweaveprotocol "github.com/missionweaveprotocol/go-sdk"
)
const (
agentID = "urn:missionweaveprotocol:agent:website-example"
keyID = "urn:missionweaveprotocol:key:website-example"
organizationID = "urn:missionweaveprotocol:organization:website-example"
)
var admissionService = missionweaveprotocol.Principal{
Type: "service",
ID: "urn:missionweaveprotocol:service:admission",
}
type deterministicSigningKey struct {
privateKey ed25519.PrivateKey
}
func (deterministicSigningKey) Algorithm() string { return "Ed25519" }
func (deterministicSigningKey) KeyID() string { return keyID }
func (key deterministicSigningKey) Sign(message []byte) ([]byte, error) {
return ed25519.Sign(key.privateKey, message), nil
}
type currentRegistryFixture struct {
registryBytes []byte
}
var _ missionweaveprotocol.AdmissionCurrentKeyResolver = currentRegistryFixture{}
var _ missionweaveprotocol.KeyResolver = currentRegistryFixture{}
func (fixture currentRegistryFixture) ResolveCurrent(
_ missionweaveprotocol.KeyResolutionRequest,
) (missionweaveprotocol.KeyRegistrySnapshot, error) {
return fixture.snapshot(), nil
}
func (fixture currentRegistryFixture) Resolve(
_ missionweaveprotocol.KeyResolutionRequest,
) (missionweaveprotocol.KeyRegistrySnapshot, error) {
return fixture.snapshot(), nil
}
func (fixture currentRegistryFixture) snapshot() missionweaveprotocol.KeyRegistrySnapshot {
return missionweaveprotocol.KeyRegistrySnapshot{
Completeness: missionweaveprotocol.KeyRegistryOrganizationWide,
RegistryBytes: append([]byte(nil), fixture.registryBytes...),
}
}
type fixedTrustedAdmissionContext struct{}
var _ missionweaveprotocol.TrustedAdmissionContext = fixedTrustedAdmissionContext{}
func (fixedTrustedAdmissionContext) Issue(
organizationID string,
signingHash string,
) (missionweaveprotocol.AdmissionContextValue, error) {
digest := sha256.Sum256([]byte(organizationID + "\x00" + signingHash))
return missionweaveprotocol.AdmissionContextValue{
AdmissionRecordID: fmt.Sprintf(
"urn:missionweaveprotocol:admission-record:%x",
digest,
),
TrustedAcceptedAt: "2026-07-15T00:05:00Z",
AcceptedBy: admissionService,
}, nil
}
type inMemoryAdmissionLog struct {
mu sync.Mutex
records map[string]missionweaveprotocol.AuthenticatedAdmissionRecord
appendCount int
}
var _ missionweaveprotocol.AdmissionLog = (*inMemoryAdmissionLog)(nil)
func (log *inMemoryAdmissionLog) Lookup(
organizationID string,
signingHash string,
) (missionweaveprotocol.AdmissionLookup, error) {
log.mu.Lock()
defer log.mu.Unlock()
record, found := log.records[logKey(organizationID, signingHash)]
if !found {
return missionweaveprotocol.AdmissionLookup{AuthoritativeAbsence: true}, nil
}
copied := copyAuthenticatedRecord(record)
return missionweaveprotocol.AdmissionLookup{Record: &copied}, nil
}
func (log *inMemoryAdmissionLog) AppendOrReturnExisting(
organizationID string,
signingHash string,
candidateBytes []byte,
) (missionweaveprotocol.AuthenticatedAdmissionRecord, error) {
log.mu.Lock()
defer log.mu.Unlock()
key := logKey(organizationID, signingHash)
if existing, found := log.records[key]; found {
return copyAuthenticatedRecord(existing), nil
}
candidate := missionweaveprotocol.AuthenticatedAdmissionRecord{
RecordBytes: append([]byte(nil), candidateBytes...),
AuthenticatedService: admissionService,
}
log.records[key] = copyAuthenticatedRecord(candidate)
log.appendCount++
return copyAuthenticatedRecord(candidate), nil
}
func copyAuthenticatedRecord(
record missionweaveprotocol.AuthenticatedAdmissionRecord,
) missionweaveprotocol.AuthenticatedAdmissionRecord {
return missionweaveprotocol.AuthenticatedAdmissionRecord{
RecordBytes: append([]byte(nil), record.RecordBytes...),
AuthenticatedService: record.AuthenticatedService,
}
}
func logKey(organizationID string, signingHash string) string {
return organizationID + "\x00" + signingHash
}
func main() {
seed := make([]byte, ed25519.SeedSize)
for index := range seed {
seed[index] = byte(index + 1)
}
privateKey := ed25519.NewKeyFromSeed(seed)
publicKey := privateKey.Public().(ed25519.PublicKey)
signingKey := deterministicSigningKey{privateKey: privateKey}
registryBytes, err := json.Marshal(map[string]any{
"organizationId": organizationID,
"bindings": []any{map[string]any{
"keyId": keyID,
"principal": map[string]any{"type": "agent", "id": agentID},
"algorithm": "Ed25519",
"publicKey": base64.RawURLEncoding.EncodeToString(publicKey),
"validFrom": "2026-07-01T00:00:00Z",
"validityHistory": []any{},
}},
})
if err != nil {
panic(err)
}
registry := currentRegistryFixture{registryBytes: registryBytes}
codec, err := missionweaveprotocol.NewSignedDocumentCodec()
if err != nil {
panic(err)
}
signedDocument, err := codec.Sign(
missionweaveprotocol.SignedDocumentCommand,
map[string]any{
"protocolVersion": "0.1",
"actionId": "urn:uuid:11111111-2222-4333-8444-555555555555",
"actor": map[string]any{"type": "agent", "id": agentID},
"sessionEpoch": float64(1),
"membershipEpoch": float64(1),
"groupId": "urn:missionweaveprotocol:group:website-example",
"kind": "message.post",
"correlationId": "urn:uuid:aaaaaaaa-bbbb-4ccc-8ddd-eeeeeeeeeeee",
"issuedAt": "2026-07-15T00:00:00Z",
"payload": map[string]any{"text": "Admission example"},
},
signingKey,
)
if err != nil {
panic(err)
}
documentBytes, err := missionweaveprotocol.MarshalCanonicalJSON(signedDocument)
if err != nil {
panic(err)
}
admissionLog := &inMemoryAdmissionLog{
records: make(map[string]missionweaveprotocol.AuthenticatedAdmissionRecord),
}
service := missionweaveprotocol.NewAdmissionService()
first, err := service.AdmitFirst(
missionweaveprotocol.SignedDocumentCommand,
documentBytes,
registry,
admissionLog,
fixedTrustedAdmissionContext{},
)
if err != nil {
panic(err)
}
historical, err := service.VerifyHistoricalAdmission(
missionweaveprotocol.SignedDocumentCommand,
documentBytes,
registry,
admissionLog,
)
if err != nil {
panic(err)
}
if !(first.Record().AdmissionRecordID() == historical.Record().AdmissionRecordID()) {
panic("historical replay returned a different Admission record")
}
if !(first.Verified().SigningHash() == historical.Verified().SigningHash()) {
panic("historical replay returned a different signing hash")
}
if !bytes.Equal(first.RecordBytes(), historical.RecordBytes()) {
panic("historical replay returned different record bytes")
}
if !(admissionLog.appendCount == 1) {
panic("Admission Log did not append exactly once")
}
fmt.Printf("first admission: %s\n", first.Record().AdmissionRecordID())
fmt.Printf("historical replay: %s\n", historical.Record().AdmissionRecordID())
}
從精確的 SDK 結帳運行它：
go run /absolute/path/to/examples/sdk/go/admission/main.go
預期輸出包含 first admission 和 historical replay
的相同記錄 ID。該程式還斷言匹配的簽章雜湊值和記錄位元組以及精確的一個附加。
