From 1b39e39fc1b979aadf84e8f315ba2f6ba97bee54 Mon Sep 17 00:00:00 2001
From: Anthony Wang <ta180m@proton.me>
Date: Mon, 11 Jul 2022 18:24:15 -0500
Subject: [PATCH] Add basic implementation of federated commenting

---
 modules/activitypub/issue.go       | 49 ++++++++++++++++++++++++++++++
 routers/api/v1/activitypub/repo.go |  8 +++--
 2 files changed, 54 insertions(+), 3 deletions(-)
 create mode 100644 modules/activitypub/issue.go

diff --git a/modules/activitypub/issue.go b/modules/activitypub/issue.go
new file mode 100644
index 000000000..a809dcbe8
--- /dev/null
+++ b/modules/activitypub/issue.go
@@ -0,0 +1,49 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activitypub
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"code.gitea.io/gitea/models/issues"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+
+	ap "github.com/go-ap/activitypub"
+)
+
+func Comment(ctx context.Context, activity ap.Note) {
+	actorIRI := activity.AttributedTo.GetLink()
+	actorIRISplit := strings.Split(actorIRI.String(), "/")
+	actorName := actorIRISplit[len(actorIRISplit)-1] + "@" + actorIRISplit[2]
+	err := FederatedUserNew(actorName, actorIRI)
+	if err != nil {
+		log.Warn("Couldn't create new user", err)
+	}
+	actorUser, err := user_model.GetUserByName(ctx, actorName)
+	if err != nil {
+		log.Warn("Couldn't find actor", err)
+	}
+
+	context := activity.Context.GetLink()
+	contextSplit := strings.Split(context.String(), "/")
+	username := contextSplit[3]
+	reponame := contextSplit[4]
+	fmt.Println(username)
+	fmt.Println(reponame)
+	repo, _ := repo_model.GetRepositoryByOwnerAndName(username, reponame)
+	idx, _ := strconv.ParseInt(contextSplit[len(contextSplit)-1], 10, 64)
+	issue, _ := issues.GetIssueByIndex(repo.ID, idx)
+	issues.CreateCommentCtx(ctx, &issues.CreateCommentOptions{
+		Doer: actorUser,
+		Repo: repo,
+		Issue: issue,
+		Content: activity.Content.String(),
+	})
+}
diff --git a/routers/api/v1/activitypub/repo.go b/routers/api/v1/activitypub/repo.go
index a3611776a..34b4bcdcb 100644
--- a/routers/api/v1/activitypub/repo.go
+++ b/routers/api/v1/activitypub/repo.go
@@ -12,6 +12,7 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/forgefed"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/activitypub"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -96,10 +97,11 @@ func RepoInbox(ctx *context.APIContext) {
 		ctx.ServerError("Error reading request body", err)
 	}
 
-	var activity ap.Activity
+	var activity ap.Object
 	activity.UnmarshalJSON(body)
-	if activity.Type == ap.FollowType {
-		// activitypub.Follow(ctx, activity)
+	log.Warn("Debug", activity)
+	if activity.Type == ap.NoteType {
+		activitypub.Comment(ctx, activity)
 	} else {
 		log.Warn("ActivityStreams type not supported", activity)
 	}