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package atproto
import (
"context"
"errors"
"fmt"
"slices"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/meta"
commonv1 "github.com/johnandersen777/socialweb-computer-kcp/api/common/v1alpha1"
"github.com/johnandersen777/socialweb-computer-kcp/api/v1alpha1"
"github.com/johnandersen777/socialweb-computer-kcp/internal/kit/conds"
"github.com/johnandersen777/socialweb-computer-kcp/internal/kit/ttlcache"
recordclient "github.com/johnandersen777/socialweb-computer-kcp/internal/policyengine/atproto"
"github.com/johnandersen777/socialweb-computer-kcp/internal/policyengine/trust"
)
const (
ReasonAssociationRefVerified = "AssociationRefVerified"
ReasonAssociationRefPending = "AssociationRefPending"
ReasonAssociationRefInvalid = "AssociationRefInvalid"
ReasonAssociationRefUnverified = "AssociationRefUnverified"
associationRefTTL = 5 * time.Minute
)
type refKey struct {
uri, cid, subject, service string
}
type refVerdict struct {
authority string
reason string
message string
expiresAt time.Time
}
func newRefCache() *ttlcache.Cache[refKey, refVerdict] {
return ttlcache.New[refKey, refVerdict](ttlcache.Options{TTL: associationRefTTL, MaxEntries: 1024})
}
func newVerifiedCache() *ttlcache.Cache[refKey, refVerdict] {
return ttlcache.New[refKey, refVerdict](ttlcache.Options{MaxEntries: 1024})
}
func refCondition(status *v1alpha1.MarketIdentityStatus, generation int64) bool {
c := meta.FindStatusCondition(status.Conditions, v1alpha1.ConditionAssociated)
return c != nil && c.ObservedGeneration == generation && strings.HasPrefix(c.Reason, "AssociationRef")
}
var ErrAssociationRefStale = errors.New("marketidentity: the verified association record could not be read again")
func AssociationRole(id *v1alpha1.MarketIdentity) string {
for _, owner := range id.OwnerReferences {
if owner.Controller == nil || !*owner.Controller {
continue
}
switch owner.Kind {
case "MarketRequester", "Gateway", "SshGateway":
return trust.RequesterAssociate
case "MarketBidder":
return trust.BidderAssociate
}
}
return ""
}
func (a *Accounts) dropAssociationRef(id *v1alpha1.MarketIdentity, status *v1alpha1.MarketIdentityStatus) {
previous := status.AssociationRef
if previous == nil {
return
}
if did := recordclient.RepoFromURI(previous.URI); !slices.Contains(uniqueDIDs(id.Spec.ApprovedAssociations), did) {
status.Associations = slices.DeleteFunc(status.Associations, func(have string) bool { return have == did })
}
status.AssociationRef = nil
setAssociated(status, id.Generation, id.Spec.Association)
if id.Spec.Mode == v1alpha1.MarketIdentityModeLocalRepo && strings.TrimSpace(status.Did) != "" &&
(status.Phase == v1alpha1.MarketIdentityPhaseReady || status.Phase == v1alpha1.MarketIdentityPhaseAwaitingApproval) {
settleAssociation(status, id.Generation, id.Spec.Association, "the PDS reports "+status.Did)
}
}
func (a *Accounts) ApplyAssociationRef(ctx context.Context, id *v1alpha1.MarketIdentity, status *v1alpha1.MarketIdentityStatus) (time.Duration, error) {
ref := id.Spec.AssociationRef
if ref == nil {
a.dropAssociationRef(id, status)
return 0, nil
}
want := commonv1.StrongRef{URI: strings.TrimSpace(ref.URI), CID: strings.TrimSpace(ref.CID)}
subject := strings.TrimSpace(status.Did)
service := AssociationRole(id)
key := refKey{uri: want.URI, cid: want.CID, subject: subject, service: service}
verdict := refVerdict{reason: ReasonAssociationRefPending, message: "waiting for the identity DID before the association record " + want.URI + " is read"}
var err error
if subject != "" {
verdict, err = a.refs.GetOrLoad(ctx, key, func(ctx context.Context) (refVerdict, time.Duration, error) {
v, err := a.verifyAssociationRef(ctx, want, subject, service)
ttl := associationRefTTL
if !v.expiresAt.IsZero() {
ttl = min(ttl, max(time.Until(v.expiresAt), time.Second))
}
return v, ttl, err
})
}
if err != nil {
a.log.Warn("the association record could not be read", "identity", id.Name, "uri", want.URI, "err", err.Error())
last, held := a.verified.Get(key)
live := held && (last.expiresAt.IsZero() || time.Now().Before(last.expiresAt))
if live && status.AssociationRef != nil && *status.AssociationRef == want && refCondition(status, id.Generation) &&
meta.IsStatusConditionTrue(status.Conditions, v1alpha1.ConditionAssociated) {
if last.expiresAt.IsZero() {
return 0, fmt.Errorf("%w: %w", ErrAssociationRefStale, err)
}
return max(time.Until(last.expiresAt), time.Second), fmt.Errorf("%w: %w", ErrAssociationRefStale, err)
}
verdict = refVerdict{reason: ReasonAssociationRefUnverified, message: "reading the association record " + want.URI + ": " + err.Error()}
}
previous := status.AssociationRef
declared := uniqueDIDs(id.Spec.ApprovedAssociations)
drop := func(did string) {
if did != "" && !slices.Contains(declared, did) {
status.Associations = slices.DeleteFunc(status.Associations, func(have string) bool { return have == did })
}
}
if previous != nil {
drop(recordclient.RepoFromURI(previous.URI))
}
if verdict.reason != ReasonAssociationRefVerified {
a.verified.Delete(key)
drop(recordclient.RepoFromURI(want.URI))
status.AssociationRef = nil
conds.Set(&status.Conditions, id.Generation, v1alpha1.ConditionAssociated, false, verdict.reason, verdict.message)
a.settleRef(id, status)
if verdict.reason == ReasonAssociationRefPending {
return 0, nil
}
a.log.Info("association record refused", "identity", id.Name, "uri", want.URI, "reason", verdict.reason, "message", verdict.message)
return 0, err
}
a.verified.Set(key, verdict)
status.Associations = uniqueDIDs(append([]string{verdict.authority}, status.Associations...))
status.AssociationRef = &want
message := "the association record " + want.URI + " of " + verdict.authority + " names " + subject + " for " + service
if !verdict.expiresAt.IsZero() {
message += " until " + verdict.expiresAt.UTC().Format(time.RFC3339)
}
conds.Set(&status.Conditions, id.Generation, v1alpha1.ConditionAssociated, true, ReasonAssociationRefVerified, message)
a.settleRef(id, status)
if verdict.expiresAt.IsZero() {
return 0, nil
}
return max(time.Until(verdict.expiresAt), time.Second), nil
}
func (a *Accounts) settleRef(id *v1alpha1.MarketIdentity, status *v1alpha1.MarketIdentityStatus) {
if id.Spec.Mode != v1alpha1.MarketIdentityModeLocalRepo || strings.TrimSpace(status.Did) == "" {
return
}
if status.Phase == v1alpha1.MarketIdentityPhaseReady || status.Phase == v1alpha1.MarketIdentityPhaseAwaitingApproval {
settleAssociation(status, id.Generation, v1alpha1.AssociationRequireApproval, "the PDS reports "+status.Did)
}
}
func (a *Accounts) verifyAssociationRef(ctx context.Context, ref commonv1.StrongRef, subject, service string) (refVerdict, error) {
invalid := func(format string, args ...any) (refVerdict, error) {
return refVerdict{reason: ReasonAssociationRefInvalid, message: fmt.Sprintf(format, args...)}, nil
}
authority, collection, rkey := recordclient.SplitURI(ref.URI)
kind := trust.KindOfCollection(collection)
switch {
case !strings.HasPrefix(ref.URI, "at://") || !strings.HasPrefix(authority, "did:") || rkey == "" || ref.CID == "":
return invalid("the association ref %s#%s is not an at://<did>/<collection>/<rkey> uri with a cid", ref.URI, ref.CID)
case kind == "":
return invalid("the association ref collection %s is not a claim, a market.association or a post", collection)
case authority == subject:
return invalid("the association record %s is in the identity's own repo", ref.URI)
case service != trust.RequesterAssociate && service != trust.BidderAssociate:
return invalid("the identity is owned by no requester or bidder root, so it has no association role")
}
record, err := a.records.GetRecordAt(ctx, recordclient.StrongRef{URI: ref.URI, CID: ref.CID})
if errors.Is(err, recordclient.ErrRecordNotFound) {
return invalid("the association record %s no longer resolves", ref.URI)
}
if err != nil {
return refVerdict{}, err
}
switch {
case record.URI != ref.URI:
return invalid("the PDS answered %s for the association record %s", record.URI, ref.URI)
case record.CID != ref.CID:
return invalid("the association record %s has cid %s, not the pinned %s", ref.URI, record.CID, ref.CID)
case !trust.Matches(kind, record.Value, authority, subject, service, trust.DefaultPostTemplate):
return invalid("the association record %s does not name %s for %s", ref.URI, subject, service)
}
verdict := refVerdict{reason: ReasonAssociationRefVerified, authority: authority}
_, scoped := record.Value["contract"]
rawExpires, expiring := record.Value["expiresAt"]
expiresAt, _ := rawExpires.(string)
if scoped && expiresAt == "" {
return invalid("the contract-scoped association record %s has no expiresAt", ref.URI)
}
if expiring {
deadline, err := time.Parse(time.RFC3339Nano, expiresAt)
if err != nil {
return invalid("the association record %s expiresAt %q is not a datetime", ref.URI, expiresAt)
}
if !time.Now().Before(deadline) {
return invalid("the association record %s expired at %s", ref.URI, expiresAt)
}
verdict.expiresAt = deadline
}
return verdict, nil
}
