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path: root/internal/federation/dereferencing/status_permitted.go
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Diffstat (limited to 'internal/federation/dereferencing/status_permitted.go')
-rw-r--r--internal/federation/dereferencing/status_permitted.go584
1 files changed, 388 insertions, 196 deletions
diff --git a/internal/federation/dereferencing/status_permitted.go b/internal/federation/dereferencing/status_permitted.go
index 2aecfc9b7..4b246653c 100644
--- a/internal/federation/dereferencing/status_permitted.go
+++ b/internal/federation/dereferencing/status_permitted.go
@@ -113,106 +113,97 @@ func (d *Dereferencer) isPermittedStatus(
func (d *Dereferencer) isPermittedReply(
ctx context.Context,
requestUser string,
- status *gtsmodel.Status,
+ reply *gtsmodel.Status,
) (bool, error) {
var (
- statusURI = status.URI // Definitely set.
- inReplyToURI = status.InReplyToURI // Definitely set.
- inReplyTo = status.InReplyTo // Might not yet be set.
+ replyURI = reply.URI // Definitely set.
+ inReplyToURI = reply.InReplyToURI // Definitely set.
+ inReplyTo = reply.InReplyTo // Might not be set.
+ acceptIRI = reply.ApprovedByURI // Might not be set.
)
- // Check if status with this URI has previously been rejected.
- req, err := d.state.DB.GetInteractionRequestByInteractionURI(
+ // Check if we have a stored interaction request for parent status.
+ parentReq, err := d.state.DB.GetInteractionRequestByInteractionURI(
gtscontext.SetBarebones(ctx),
- statusURI,
+ inReplyToURI,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err := gtserror.Newf("db error getting interaction request: %w", err)
return false, err
}
- if req != nil && req.IsRejected() {
- // This status has been
- // rejected reviously, so
- // it's not permitted now.
- return false, nil
- }
-
- // Check if replied-to status has previously been rejected.
- req, err = d.state.DB.GetInteractionRequestByInteractionURI(
+ // Check if we have a stored interaction request for this reply.
+ thisReq, err := d.state.DB.GetInteractionRequestByInteractionURI(
gtscontext.SetBarebones(ctx),
- inReplyToURI,
+ replyURI,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err := gtserror.Newf("db error getting interaction request: %w", err)
return false, err
}
- if req != nil && req.IsRejected() {
- // This status's parent was rejected, so
- // implicitly this reply should be rejected too.
- //
- // We know already that we haven't inserted
- // a rejected interaction request for this
- // status yet so do it before returning.
- id := id.NewULID()
-
- // To ensure the Reject chain stays coherent,
- // borrow fields from the up-thread rejection.
- // This collapses the chain beyond the first
- // rejected reply and allows us to avoid derefing
- // further replies we already know we don't want.
- statusID := req.StatusID
- targetAccountID := req.TargetAccountID
-
- // As nobody is actually Rejecting the reply
- // directly, but it's an implicit Reject coming
- // from our internal logic, don't bother setting
- // a URI (it's not a required field anyway).
- uri := ""
-
- rejection := &gtsmodel.InteractionRequest{
- ID: id,
- StatusID: statusID,
- TargetAccountID: targetAccountID,
- InteractingAccountID: status.AccountID,
- InteractionURI: statusURI,
- InteractionType: gtsmodel.InteractionReply,
- URI: uri,
- RejectedAt: time.Now(),
- }
- err := d.state.DB.PutInteractionRequest(ctx, rejection)
- if err != nil && !errors.Is(err, db.ErrAlreadyExists) {
- return false, gtserror.Newf("db error putting pre-rejected interaction request: %w", err)
- }
+ parentRejected := (parentReq != nil && parentReq.IsRejected())
+ thisRejected := (thisReq != nil && thisReq.IsRejected())
+
+ if parentRejected {
+ // If this status's parent was rejected,
+ // implicitly this reply should be too;
+ // there's nothing more to check here.
+ return false, d.unpermittedByParent(
+ ctx,
+ reply,
+ thisReq,
+ parentReq,
+ )
+ }
+ // Parent wasn't rejected. Check if this
+ // reply itself was rejected previously.
+ //
+ // If it was, and it doesn't now claim to
+ // be approved, then we should just reject it
+ // again, as nothing's changed since last time.
+ if thisRejected && acceptIRI == "" {
+ // Nothing changed,
+ // still rejected.
return false, nil
}
+ // This reply wasn't rejected previously, or
+ // it was rejected previously and now claims
+ // to be approved. Continue permission checks.
+
if inReplyTo == nil {
- // We didn't have the replied-to status in
- // our database (yet) so we can't know if
- // this reply is permitted or not. For now
- // just return true; worst-case, the status
- // sticks around on the instance for a couple
- // hours until we try to dereference it again
- // and realize it should be forbidden.
- return true, nil
+ // If we didn't have the replied-to status
+ // in our database (yet), we can't check
+ // right now if this reply is permitted.
+ //
+ // For now, just return permitted if reply
+ // was not explicitly rejected before; worst-
+ // case, the reply stays on the instance for
+ // a couple hours until we try to deref it
+ // again and realize it should be forbidden.
+ return !thisRejected, nil
}
+ // We have the replied-to status; ensure it's fully populated.
+ if err := d.state.DB.PopulateStatus(ctx, inReplyTo); err != nil {
+ return false, gtserror.Newf("error populating status %s: %w", reply.ID, err)
+ }
+
+ // Make sure replied-to status is not
+ // a boost wrapper, and make sure it's
+ // actually visible to the requester.
if inReplyTo.BoostOfID != "" {
- // We do not permit replies to
- // boost wrapper statuses. (this
- // shouldn't be able to happen).
+ // We do not permit replies
+ // to boost wrapper statuses.
log.Info(ctx, "rejecting reply to boost wrapper status")
return false, nil
}
- // Check visibility of local
- // inReplyTo to replying account.
if inReplyTo.IsLocal() {
visible, err := d.visFilter.StatusVisible(ctx,
- status.Account,
+ reply.Account,
inReplyTo,
)
if err != nil {
@@ -227,9 +218,26 @@ func (d *Dereferencer) isPermittedReply(
}
}
- // Check interaction policy of inReplyTo.
+ // If this reply claims to be approved,
+ // validate this by dereferencing the
+ // Accept and checking the return value.
+ // No further checks are required.
+ if acceptIRI != "" {
+ return d.isPermittedByAcceptIRI(
+ ctx,
+ requestUser,
+ reply,
+ inReplyTo,
+ thisReq,
+ acceptIRI,
+ )
+ }
+
+ // Status doesn't claim to be approved.
+ // Check interaction policy of inReplyTo
+ // to see if it doesn't require approval.
replyable, err := d.intFilter.StatusReplyable(ctx,
- status.Account,
+ reply.Account,
inReplyTo,
)
if err != nil {
@@ -238,93 +246,250 @@ func (d *Dereferencer) isPermittedReply(
}
if replyable.Forbidden() {
- // Reply is not permitted.
+ // Reply is not permitted according to policy.
//
- // Insert a pre-rejected interaction request
- // into the db and return. This ensures that
- // replies to this now-rejected status aren't
- // inadvertently permitted.
- id := id.NewULID()
- rejection := &gtsmodel.InteractionRequest{
- ID: id,
- StatusID: inReplyTo.ID,
- TargetAccountID: inReplyTo.AccountID,
- InteractingAccountID: status.AccountID,
- InteractionURI: statusURI,
- InteractionType: gtsmodel.InteractionReply,
- URI: uris.GenerateURIForReject(inReplyTo.Account.Username, id),
- RejectedAt: time.Now(),
- }
- err := d.state.DB.PutInteractionRequest(ctx, rejection)
- if err != nil && !errors.Is(err, db.ErrAlreadyExists) {
- return false, gtserror.Newf("db error putting pre-rejected interaction request: %w", err)
- }
-
- return false, nil
+ // Either insert a pre-rejected interaction
+ // req into the db, or update the existing
+ // one, and return. This ensures that replies
+ // to this rejected reply also aren't permitted.
+ return false, d.rejectedByPolicy(
+ ctx,
+ reply,
+ inReplyTo,
+ thisReq,
+ )
}
- if replyable.Permitted() &&
- !replyable.MatchedOnCollection() {
- // Replier is permitted to do this
- // interaction, and didn't match on
- // a collection so we don't need to
- // do further checking.
+ // Reply is permitted according to the interaction
+ // policy set on the replied-to status (if any).
+
+ if !replyable.MatchedOnCollection() {
+ // If we didn't match on a collection,
+ // then we don't require an acceptIRI,
+ // and we don't need to send an Accept;
+ // just permit the reply full stop.
return true, nil
}
- // Replier is permitted to do this
- // interaction pending approval, or
- // permitted but matched on a collection.
+ // Reply is permitted, but match was made based
+ // on inclusion in a followers/following collection.
//
- // Check if we can dereference
- // an Accept that grants approval.
+ // If the status is ours, mark it as PreApproved
+ // so the processor knows to create and send out
+ // an Accept for it immediately.
+ if inReplyTo.IsLocal() {
+ reply.PendingApproval = util.Ptr(true)
+ reply.PreApproved = true
+ return true, nil
+ }
- if status.ApprovedByURI == "" {
- // Status doesn't claim to be approved.
- //
- // For replies to local statuses that's
- // fine, we can put it in the DB pending
- // approval, and continue processing it.
- //
- // If permission was granted based on a match
- // with a followers or following collection,
- // we can mark it as PreApproved so the processor
- // sends an accept out for it immediately.
- //
- // For replies to remote statuses, though
- // we should be polite and just drop it.
- if inReplyTo.IsLocal() {
- status.PendingApproval = util.Ptr(true)
- status.PreApproved = replyable.MatchedOnCollection()
- return true, nil
+ // For replies to remote statuses, which matched
+ // on a followers/following collection, but did not
+ // include an acceptIRI, we should just drop it.
+ // It's possible we'll get an Accept for it later
+ // and we can check everything again.
+ return false, nil
+}
+
+// unpermittedByParent marks the given reply as rejected
+// based on the fact that its parent was rejected.
+//
+// This will create a rejected interaction request for
+// the status in the db, if one didn't exist already,
+// or update an existing interaction request instead.
+func (d *Dereferencer) unpermittedByParent(
+ ctx context.Context,
+ reply *gtsmodel.Status,
+ thisReq *gtsmodel.InteractionRequest,
+ parentReq *gtsmodel.InteractionRequest,
+) error {
+ if thisReq != nil && thisReq.IsRejected() {
+ // This interaction request is
+ // already marked as rejected,
+ // there's nothing more to do.
+ return nil
+ }
+
+ if thisReq != nil {
+ // Before we return, ensure interaction
+ // request is marked as rejected.
+ thisReq.RejectedAt = time.Now()
+ thisReq.AcceptedAt = time.Time{}
+ err := d.state.DB.UpdateInteractionRequest(
+ ctx,
+ thisReq,
+ "rejected_at",
+ "accepted_at",
+ )
+ if err != nil {
+ return gtserror.Newf("db error updating interaction request: %w", err)
}
- return false, nil
+ return nil
}
- // Status claims to be approved, check
- // this by dereferencing the Accept and
- // inspecting the return value.
- if err := d.validateApprovedBy(
+ // We haven't stored a rejected interaction
+ // request for this status yet, do it now.
+ rejectID := id.NewULID()
+
+ // To ensure the Reject chain stays coherent,
+ // borrow fields from the up-thread rejection.
+ // This collapses the chain beyond the first
+ // rejected reply and allows us to avoid derefing
+ // further replies we already know we don't want.
+ inReplyToID := parentReq.StatusID
+ targetAccountID := parentReq.TargetAccountID
+
+ // As nobody is actually Rejecting the reply
+ // directly, but it's an implicit Reject coming
+ // from our internal logic, don't bother setting
+ // a URI (it's not a required field anyway).
+ uri := ""
+
+ rejection := &gtsmodel.InteractionRequest{
+ ID: rejectID,
+ StatusID: inReplyToID,
+ TargetAccountID: targetAccountID,
+ InteractingAccountID: reply.AccountID,
+ InteractionURI: reply.URI,
+ InteractionType: gtsmodel.InteractionReply,
+ URI: uri,
+ RejectedAt: time.Now(),
+ }
+ err := d.state.DB.PutInteractionRequest(ctx, rejection)
+ if err != nil && !errors.Is(err, db.ErrAlreadyExists) {
+ return gtserror.Newf("db error putting pre-rejected interaction request: %w", err)
+ }
+
+ return nil
+}
+
+// isPermittedByAcceptIRI checks whether the given acceptIRI
+// permits the given reply to the given inReplyTo status.
+// If yes, then thisReq will be updated to reflect the
+// acceptance, if it's not nil.
+func (d *Dereferencer) isPermittedByAcceptIRI(
+ ctx context.Context,
+ requestUser string,
+ reply *gtsmodel.Status,
+ inReplyTo *gtsmodel.Status,
+ thisReq *gtsmodel.InteractionRequest,
+ acceptIRI string,
+) (bool, error) {
+ permitted, err := d.isValidAccept(
ctx,
requestUser,
- status.ApprovedByURI,
- statusURI,
+ acceptIRI,
+ reply.URI,
inReplyTo.AccountURI,
- ); err != nil {
-
+ )
+ if err != nil {
// Error dereferencing means we couldn't
// get the Accept right now or it wasn't
// valid, so we shouldn't store this status.
- log.Errorf(ctx, "undereferencable ApprovedByURI: %v", err)
+ err := gtserror.Newf("undereferencable ApprovedByURI: %w", err)
+ return false, err
+ }
+
+ if !permitted {
+ // It's a no from
+ // us, squirt.
return false, nil
}
- // Status has been approved.
- status.PendingApproval = util.Ptr(false)
+ // Reply is permitted by this Accept.
+ // If it was previously rejected or
+ // pending approval, clear that now.
+ reply.PendingApproval = util.Ptr(false)
+ if thisReq != nil {
+ thisReq.URI = acceptIRI
+ thisReq.AcceptedAt = time.Now()
+ thisReq.RejectedAt = time.Time{}
+ err := d.state.DB.UpdateInteractionRequest(
+ ctx,
+ thisReq,
+ "uri",
+ "accepted_at",
+ "rejected_at",
+ )
+ if err != nil {
+ return false, gtserror.Newf("db error updating interaction request: %w", err)
+ }
+ }
+
+ // All good!
return true, nil
}
+func (d *Dereferencer) rejectedByPolicy(
+ ctx context.Context,
+ reply *gtsmodel.Status,
+ inReplyTo *gtsmodel.Status,
+ thisReq *gtsmodel.InteractionRequest,
+) error {
+ var (
+ rejectID string
+ rejectURI string
+ )
+
+ if thisReq != nil {
+ // Reuse existing ID.
+ rejectID = thisReq.ID
+ } else {
+ // Generate new ID.
+ rejectID = id.NewULID()
+ }
+
+ if inReplyTo.IsLocal() {
+ // If this a reply to one of our statuses
+ // we should generate a URI for the Reject,
+ // else just use an implicit (empty) URI.
+ rejectURI = uris.GenerateURIForReject(
+ inReplyTo.Account.Username,
+ rejectID,
+ )
+ }
+
+ if thisReq != nil {
+ // Before we return, ensure interaction
+ // request is marked as rejected.
+ thisReq.RejectedAt = time.Now()
+ thisReq.AcceptedAt = time.Time{}
+ thisReq.URI = rejectURI
+ err := d.state.DB.UpdateInteractionRequest(
+ ctx,
+ thisReq,
+ "rejected_at",
+ "accepted_at",
+ "uri",
+ )
+ if err != nil {
+ return gtserror.Newf("db error updating interaction request: %w", err)
+ }
+
+ return nil
+ }
+
+ // We haven't stored a rejected interaction
+ // request for this status yet, do it now.
+ rejection := &gtsmodel.InteractionRequest{
+ ID: rejectID,
+ StatusID: inReplyTo.ID,
+ TargetAccountID: inReplyTo.AccountID,
+ InteractingAccountID: reply.AccountID,
+ InteractionURI: reply.URI,
+ InteractionType: gtsmodel.InteractionReply,
+ URI: rejectURI,
+ RejectedAt: time.Now(),
+ }
+ err := d.state.DB.PutInteractionRequest(ctx, rejection)
+ if err != nil && !errors.Is(err, db.ErrAlreadyExists) {
+ return gtserror.Newf("db error putting pre-rejected interaction request: %w", err)
+ }
+
+ return nil
+}
+
func (d *Dereferencer) isPermittedBoost(
ctx context.Context,
requestUser string,
@@ -418,18 +583,22 @@ func (d *Dereferencer) isPermittedBoost(
// Boost claims to be approved, check
// this by dereferencing the Accept and
// inspecting the return value.
- if err := d.validateApprovedBy(
+ permitted, err := d.isValidAccept(
ctx,
requestUser,
status.ApprovedByURI,
status.URI,
boostOf.AccountURI,
- ); err != nil {
-
+ )
+ if err != nil {
// Error dereferencing means we couldn't
// get the Accept right now or it wasn't
// valid, so we shouldn't store this status.
- log.Errorf(ctx, "undereferencable ApprovedByURI: %v", err)
+ err := gtserror.Newf("undereferencable ApprovedByURI: %w", err)
+ return false, err
+ }
+
+ if !permitted {
return false, nil
}
@@ -438,43 +607,59 @@ func (d *Dereferencer) isPermittedBoost(
return true, nil
}
-// validateApprovedBy dereferences the activitystreams Accept at
-// the specified IRI, and checks the Accept for validity against
-// the provided expectedObject and expectedActor.
+// isValidAccept dereferences the activitystreams Accept at the
+// specified IRI, and checks the Accept for validity against the
+// provided expectedObject and expectedActor.
//
-// Will return either nil if everything looked OK, or an error if
-// something went wrong during deref, or if the dereffed Accept
-// did not meet expectations.
-func (d *Dereferencer) validateApprovedBy(
+// Will return either (true, nil) if everything looked OK, an error
+// if something went wrong internally during deref, or (false, nil)
+// if the dereferenced Accept did not meet expectations.
+func (d *Dereferencer) isValidAccept(
ctx context.Context,
requestUser string,
- approvedByURIStr string, // Eg., "https://example.org/users/someone/accepts/01J2736AWWJ3411CPR833F6D03"
+ acceptIRIStr string, // Eg., "https://example.org/users/someone/accepts/01J2736AWWJ3411CPR833F6D03"
expectObjectURIStr string, // Eg., "https://some.instance.example.org/users/someone_else/statuses/01J27414TWV9F7DC39FN8ABB5R"
expectActorURIStr string, // Eg., "https://example.org/users/someone"
-) error {
- approvedByURI, err := url.Parse(approvedByURIStr)
+) (bool, error) {
+ l := log.
+ WithContext(ctx).
+ WithField("acceptIRI", acceptIRIStr)
+
+ acceptIRI, err := url.Parse(acceptIRIStr)
if err != nil {
- err := gtserror.Newf("error parsing approvedByURI: %w", err)
- return err
+ // Real returnable error.
+ err := gtserror.Newf("error parsing acceptIRI: %w", err)
+ return false, err
}
- // Don't make calls to the remote if it's blocked.
- if blocked, err := d.state.DB.IsDomainBlocked(ctx, approvedByURI.Host); blocked || err != nil {
- err := gtserror.Newf("domain %s is blocked", approvedByURI.Host)
- return err
+ // Don't make calls to the Accept IRI
+ // if it's blocked, just return false.
+ blocked, err := d.state.DB.IsDomainBlocked(ctx, acceptIRI.Host)
+ if err != nil {
+ // Real returnable error.
+ err := gtserror.Newf("error checking domain block: %w", err)
+ return false, err
+ }
+
+ if blocked {
+ l.Info("Accept host is blocked")
+ return false, nil
}
tsport, err := d.transportController.NewTransportForUsername(ctx, requestUser)
if err != nil {
+ // Real returnable error.
err := gtserror.Newf("error creating transport: %w", err)
- return err
+ return false, err
}
// Make the call to resolve into an Acceptable.
- rsp, err := tsport.Dereference(ctx, approvedByURI)
+ // Log any error encountered here but don't
+ // return it as it's not *our* error.
+ rsp, err := tsport.Dereference(ctx, acceptIRI)
if err != nil {
- err := gtserror.Newf("error dereferencing %s: %w", approvedByURIStr, err)
- return err
+ l.Errorf("error dereferencing Accept: %v", err)
+ return false, nil
}
acceptable, err := ap.ResolveAcceptable(ctx, rsp.Body)
@@ -483,66 +668,71 @@ func (d *Dereferencer) validateApprovedBy(
_ = rsp.Body.Close()
if err != nil {
- err := gtserror.Newf("error resolving Accept %s: %w", approvedByURIStr, err)
- return err
+ l.Errorf("error resolving to Accept: %v", err)
+ return false, err
}
// Extract the URI/ID of the Accept.
- acceptURI := ap.GetJSONLDId(acceptable)
- acceptURIStr := acceptURI.String()
+ acceptID := ap.GetJSONLDId(acceptable)
+ acceptIDStr := acceptID.String()
// Check whether input URI and final returned URI
// have changed (i.e. we followed some redirects).
rspURL := rsp.Request.URL
rspURLStr := rspURL.String()
- switch {
- case rspURLStr == approvedByURIStr:
+ if rspURLStr != acceptIRIStr {
+ // If rspURLStr != acceptIRIStr, make sure final
+ // response URL is at least on the same host as
+ // what we expected (ie., we weren't redirected
+ // across domains), and make sure it's the same
+ // as the ID of the Accept we were returned.
+ switch {
+ case rspURL.Host != acceptIRI.Host:
+ l.Errorf(
+ "final deref host %s did not match acceptIRI host",
+ rspURL.Host,
+ )
+ return false, nil
- // i.e. from here, rspURLStr != approvedByURIStr.
- //
- // Make sure it's at least on the same host as
- // what we expected (ie., we weren't redirected
- // across domains), and make sure it's the same
- // as the ID of the Accept we were returned.
- case rspURL.Host != approvedByURI.Host:
- return gtserror.Newf(
- "final dereference host %s did not match approvedByURI host %s",
- rspURL.Host, approvedByURI.Host,
- )
- case acceptURIStr != rspURLStr:
- return gtserror.Newf(
- "final dereference uri %s did not match returned Accept ID/URI %s",
- rspURLStr, acceptURIStr,
- )
+ case acceptIDStr != rspURLStr:
+ l.Errorf(
+ "final deref uri %s did not match returned Accept ID %s",
+ rspURLStr, acceptIDStr,
+ )
+ return false, nil
+ }
}
+ // Response is superficially OK,
+ // check in more detail now.
+
// Extract the actor IRI and string from Accept.
actorIRIs := ap.GetActorIRIs(acceptable)
actorIRI, actorIRIStr := extractIRI(actorIRIs)
switch {
case actorIRIStr == "":
- err := gtserror.New("missing Accept actor IRI")
- return gtserror.SetMalformed(err)
+ l.Error("Accept missing actor IRI")
+ return false, nil
- // Ensure the Accept Actor is who we expect
- // it to be, and not someone else trying to
- // do an Accept for an interaction with a
- // statusable they don't own.
- case actorIRI.Host != acceptURI.Host:
- return gtserror.Newf(
- "Accept Actor %s was not the same host as Accept %s",
- actorIRIStr, acceptURIStr,
+ // Ensure the Accept Actor is on
+ // the instance hosting the Accept.
+ case actorIRI.Host != acceptID.Host:
+ l.Errorf(
+ "actor %s not on the same host as Accept",
+ actorIRIStr,
)
+ return false, nil
// Ensure the Accept Actor is who we expect
// it to be, and not someone else trying to
// do an Accept for an interaction with a
// statusable they don't own.
case actorIRIStr != expectActorURIStr:
- return gtserror.Newf(
- "Accept Actor %s was not the same as expected actor %s",
+ l.Errorf(
+ "actor %s was not the same as expected actor %s",
actorIRIStr, expectActorURIStr,
)
+ return false, nil
}
// Extract the object IRI string from Accept.
@@ -550,20 +740,22 @@ func (d *Dereferencer) validateApprovedBy(
_, objectIRIStr := extractIRI(objectIRIs)
switch {
case objectIRIStr == "":
- err := gtserror.New("missing Accept object IRI")
- return gtserror.SetMalformed(err)
+ l.Error("missing Accept object IRI")
+ return false, nil
// Ensure the Accept Object is what we expect
// it to be, ie., it's Accepting the interaction
// we need it to Accept, and not something else.
case objectIRIStr != expectObjectURIStr:
- return gtserror.Newf(
- "resolved Accept Object uri %s was not the same as expected object %s",
+ l.Errorf(
+ "resolved Accept object IRI %s was not the same as expected object %s",
objectIRIStr, expectObjectURIStr,
)
+ return false, nil
}
- return nil
+ // Everything looks OK.
+ return true, nil
}
// extractIRI is shorthand to extract the first IRI