1 files changed, 111 insertions, 0 deletions
diff --git a/modules/forgefed/repository.go b/modules/forgefed/repository.go
new file mode 100644
index 00000000..63680ccd
--- /dev/null
+++ b/modules/forgefed/repository.go
@@ -0,0 +1,111 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package forgefed
+
+import (
+	"reflect"
+	"unsafe"
+
+	ap "github.com/go-ap/activitypub"
+	"github.com/valyala/fastjson"
+)
+
+const (
+	RepositoryType ap.ActivityVocabularyType = "Repository"
+)
+
+type Repository struct {
+	ap.Actor
+	// Team Collection of actors who have management/push access to the repository
+	Team ap.Item `jsonld:"team,omitempty"`
+	// Forks OrderedCollection of repositories that are forks of this repository
+	Forks ap.Item `jsonld:"forks,omitempty"`
+	// ForkedFrom Identifies the repository which this repository was created as a fork
+	ForkedFrom ap.Item `jsonld:"forkedFrom,omitempty"`
+}
+
+// RepositoryNew initializes a Repository type actor
+func RepositoryNew(id ap.ID) *Repository {
+	a := ap.ActorNew(id, RepositoryType)
+	a.Type = RepositoryType
+	o := Repository{Actor: *a}
+	return &o
+}
+
+func (r Repository) MarshalJSON() ([]byte, error) {
+	b, err := r.Actor.MarshalJSON()
+	if len(b) == 0 || err != nil {
+		return nil, err
+	}
+
+	b = b[:len(b)-1]
+	if r.Team != nil {
+		ap.JSONWriteItemProp(&b, "team", r.Team)
+	}
+	if r.Forks != nil {
+		ap.JSONWriteItemProp(&b, "forks", r.Forks)
+	}
+	if r.ForkedFrom != nil {
+		ap.JSONWriteItemProp(&b, "forkedFrom", r.ForkedFrom)
+	}
+	ap.JSONWrite(&b, '}')
+	return b, nil
+}
+
+func JSONLoadRepository(val *fastjson.Value, r *Repository) error {
+	if err := ap.OnActor(&r.Actor, func(a *ap.Actor) error {
+		return ap.JSONLoadActor(val, a)
+	}); err != nil {
+		return err
+	}
+
+	r.Team = ap.JSONGetItem(val, "team")
+	r.Forks = ap.JSONGetItem(val, "forks")
+	r.ForkedFrom = ap.JSONGetItem(val, "forkedFrom")
+	return nil
+}
+
+func (r *Repository) UnmarshalJSON(data []byte) error {
+	p := fastjson.Parser{}
+	val, err := p.ParseBytes(data)
+	if err != nil {
+		return err
+	}
+	return JSONLoadRepository(val, r)
+}
+
+// ToRepository tries to convert the it Item to a Repository Actor.
+func ToRepository(it ap.Item) (*Repository, error) {
+	switch i := it.(type) {
+	case *Repository:
+		return i, nil
+	case Repository:
+		return &i, nil
+	case *ap.Actor:
+		return (*Repository)(unsafe.Pointer(i)), nil
+	case ap.Actor:
+		return (*Repository)(unsafe.Pointer(&i)), nil
+	default:
+		// NOTE(marius): this is an ugly way of dealing with the interface conversion error: types from different scopes
+		typ := reflect.TypeOf(new(Repository))
+		if i, ok := reflect.ValueOf(it).Convert(typ).Interface().(*Repository); ok {
+			return i, nil
+		}
+	}
+	return nil, ap.ErrorInvalidType[ap.Actor](it)
+}
+
+type withRepositoryFn func(*Repository) error
+
+// OnRepository calls function fn on it Item if it can be asserted to type *Repository
+func OnRepository(it ap.Item, fn withRepositoryFn) error {
+	if it == nil {
+		return nil
+	}
+	ob, err := ToRepository(it)
+	if err != nil {
+		return err
+	}
+	return fn(ob)
+}