introduce repo from exosy

routers/api/v1/activitypub/response.go

@@ -0,0 +1,65 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package activitypub
+
+import (
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/activitypub"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/forgefed"
+	"code.gitea.io/gitea/modules/log"
+
+	ap "github.com/go-ap/activitypub"
+	"github.com/go-ap/jsonld"
+)
+
+// Respond with a ActivityStreams Collection
+func responseCollection(ctx *context.APIContext, iri string, listOptions db.ListOptions, items []string, count int64) {
+	collection := ap.OrderedCollectionNew(ap.IRI(iri))
+	collection.First = ap.IRI(iri + "?page=1")
+	collection.TotalItems = uint(count)
+	if listOptions.Page == 0 {
+		response(ctx, collection)
+		return
+	}
+
+	page := ap.OrderedCollectionPageNew(collection)
+	page.ID = ap.IRI(fmt.Sprintf("%s?page=%d", iri, listOptions.Page))
+	if listOptions.Page > 1 {
+		page.Prev = ap.IRI(fmt.Sprintf("%s?page=%d", iri, listOptions.Page-1))
+	}
+	if listOptions.Page*listOptions.PageSize < int(count) {
+		page.Next = ap.IRI(fmt.Sprintf("%s?page=%d", iri, listOptions.Page+1))
+	}
+	for _, item := range items {
+		err := page.OrderedItems.Append(ap.IRI(item))
+		if err != nil {
+			ctx.ServerError("Append", err)
+		}
+	}
+
+	response(ctx, page)
+}
+
+// Respond with an ActivityStreams object
+func response(ctx *context.APIContext, v interface{}) {
+	binary, err := jsonld.WithContext(
+		jsonld.IRI(ap.ActivityBaseURI),
+		jsonld.IRI(ap.SecurityContextURI),
+		jsonld.IRI(forgefed.ForgeFedNamespaceURI),
+	).Marshal(v)
+	if err != nil {
+		ctx.ServerError("Marshal", err)
+		return
+	}
+
+	ctx.Resp.Header().Add("Content-Type", activitypub.ActivityStreamsContentType)
+	ctx.Resp.WriteHeader(http.StatusOK)
+	if _, err = ctx.Resp.Write(binary); err != nil {
+		log.Error("write to resp err: %v", err)
+	}
+}