[feature] Federate interaction policies + Accepts; enforce policies (#3138)

* [feature] Federate interaction policies + Accepts; enforce policies

* use Acceptable type

* fix index

* remove appendIRIStrs

* add GetAccept federatingdb function

* lock on object IRI

1 files changed, 44 insertions, 0 deletions

diff --git a/internal/ap/interfaces.go b/internal/ap/interfaces.go
index 8f2e17c09..a721fa997 100644
--- a/internal/ap/interfaces.go
+++ b/internal/ap/interfaces.go
@@ -124,6 +124,24 @@ func ToPollOptionable(t vocab.Type) (PollOptionable, bool) {
 	return note, true
 }
 
+// IsAccept returns whether AS vocab type name
+// is something that can be cast to Accept.
+func IsAcceptable(typeName string) bool {
+	return typeName == ActivityAccept
+}
+
+// ToAcceptable safely tries to cast vocab.Type as vocab.ActivityStreamsAccept.
+//
+// TODO: Add additional "Accept" types here, eg., "ApproveReply" from
+// https://codeberg.org/fediverse/fep/src/branch/main/fep/5624/fep-5624.md
+func ToAcceptable(t vocab.Type) (vocab.ActivityStreamsAccept, bool) {
+	acceptable, ok := t.(vocab.ActivityStreamsAccept)
+	if !ok || !IsAcceptable(t.GetTypeName()) {
+		return nil, false
+	}
+	return acceptable, true
+}
+
 // Activityable represents the minimum activitypub interface for representing an 'activity'.
 // (see: IsActivityable() for types implementing this, though you MUST make sure to check
 // the typeName as this bare interface may be implementable by non-Activityable types).
@@ -188,6 +206,8 @@ type Statusable interface {
 	WithAttachment
 	WithTag
 	WithReplies
+	WithInteractionPolicy
+	WithApprovedBy
 }
 
 // Pollable represents the minimum activitypub interface for representing a 'poll' (it's a subset of a status).
@@ -217,6 +237,12 @@ type PollOptionable interface {
 	WithAttributedTo
 }
 
+// Acceptable represents the minimum activitypub
+// interface for representing an Accept.
+type Acceptable interface {
+	Activityable
+}
+
 // Attachmentable represents the minimum activitypub interface for representing a 'mediaAttachment'. (see: IsAttachmentable).
 // This interface is fulfilled by: Audio, Document, Image, Video
 type Attachmentable interface {
@@ -657,3 +683,21 @@ type WithVotersCount interface {
 	GetTootVotersCount() vocab.TootVotersCountProperty
 	SetTootVotersCount(vocab.TootVotersCountProperty)
 }
+
+// WithReplies represents an object with GoToSocialInteractionPolicy.
+type WithInteractionPolicy interface {
+	GetGoToSocialInteractionPolicy() vocab.GoToSocialInteractionPolicyProperty
+	SetGoToSocialInteractionPolicy(vocab.GoToSocialInteractionPolicyProperty)
+}
+
+// WithPolicyRules represents an activity with always and approvalRequired properties.
+type WithPolicyRules interface {
+	GetGoToSocialAlways() vocab.GoToSocialAlwaysProperty
+	GetGoToSocialApprovalRequired() vocab.GoToSocialApprovalRequiredProperty
+}
+
+// WithApprovedBy represents a Statusable with the approvedBy property.
+type WithApprovedBy interface {
+	GetGoToSocialApprovedBy() vocab.GoToSocialApprovedByProperty
+	SetGoToSocialApprovedBy(vocab.GoToSocialApprovedByProperty)
+}