appview/notify: notify users mentioned on PR comments

Signed-off-by: Seongmin Lee <[e-mail]>

appview/notify/db/db.go

···
 	)
 }
 
-func (n *databaseNotifier) NewPullComment(ctx context.Context, comment *models.PullComment) {
+func (n *databaseNotifier) NewPullComment(ctx context.Context, comment *models.PullComment, mentions []syntax.DID) {
 	pull, err := db.GetPull(n.db,
 		syntax.ATURI(comment.RepoAt),
 		comment.PullId,
···
 		actorDid,
 		recipients,
 		eventType,
+		entityType,
+		entityId,
+		repoId,
+		issueId,
+		pullId,
+	)
+	n.notifyEvent(
+		actorDid,
+		mentions,
+		models.NotificationTypeUserMentioned,
 		entityType,
 		entityId,
 		repoId,

appview/notify/merged_notifier.go

···
 	m.fanout("NewPull", ctx, pull)
 }
 
-func (m *mergedNotifier) NewPullComment(ctx context.Context, comment *models.PullComment) {
-	m.fanout("NewPullComment", ctx, comment)
+func (m *mergedNotifier) NewPullComment(ctx context.Context, comment *models.PullComment, mentions []syntax.DID) {
+	m.fanout("NewPullComment", ctx, comment, mentions)
 }
 
 func (m *mergedNotifier) NewPullState(ctx context.Context, actor syntax.DID, pull *models.Pull) {

appview/notify/notifier.go

···
 	DeleteFollow(ctx context.Context, follow *models.Follow)
 
 	NewPull(ctx context.Context, pull *models.Pull)
-	NewPullComment(ctx context.Context, comment *models.PullComment)
+	NewPullComment(ctx context.Context, comment *models.PullComment, mentions []syntax.DID)
 	NewPullState(ctx context.Context, actor syntax.DID, pull *models.Pull)
 
 	UpdateProfile(ctx context.Context, profile *models.Profile)
···
 func (m *BaseNotifier) NewFollow(ctx context.Context, follow *models.Follow)    {}
 func (m *BaseNotifier) DeleteFollow(ctx context.Context, follow *models.Follow) {}
 
-func (m *BaseNotifier) NewPull(ctx context.Context, pull *models.Pull)                        {}
-func (m *BaseNotifier) NewPullComment(ctx context.Context, models *models.PullComment)        {}
+func (m *BaseNotifier) NewPull(ctx context.Context, pull *models.Pull) {}
+func (m *BaseNotifier) NewPullComment(ctx context.Context, models *models.PullComment, mentions []syntax.DID) {
+}
 func (m *BaseNotifier) NewPullState(ctx context.Context, actor syntax.DID, pull *models.Pull) {}
 
 func (m *BaseNotifier) UpdateProfile(ctx context.Context, profile *models.Profile) {}

appview/notify/posthog/notifier.go

···
 	}
 }
 
-func (n *posthogNotifier) NewPullComment(ctx context.Context, comment *models.PullComment) {
+func (n *posthogNotifier) NewPullComment(ctx context.Context, comment *models.PullComment, mentions []syntax.DID) {
 	err := n.client.Enqueue(posthog.Capture{
 		DistinctId: comment.OwnerDid,
 		Event:      "new_pull_comment",
 		Properties: posthog.Properties{
-			"repo_at": comment.RepoAt,
-			"pull_id": comment.PullId,
+			"repo_at":  comment.RepoAt,
+			"pull_id":  comment.PullId,
+			"mentions": mentions,
 		},
 	})
 	if err != nil {

appview/pulls/pulls.go

···
 }
 
 func (s *Pulls) PullComment(w http.ResponseWriter, r *http.Request) {
+	l := s.logger.With("handler", "PullComment")
 	user := s.oauth.GetUser(r)
 	f, err := s.repoResolver.Resolve(r)
 	if err != nil {
···
 			return
 		}
 
-		s.notifier.NewPullComment(r.Context(), comment)
+		rawMentions := markup.FindUserMentions(comment.Body)
+		idents := s.idResolver.ResolveIdents(r.Context(), rawMentions)
+		l.Debug("parsed mentions", "raw", rawMentions, "idents", idents)
+		var mentions []syntax.DID
+		for _, ident := range idents {
+			if ident != nil && !ident.Handle.IsInvalidHandle() {
+				mentions = append(mentions, ident.DID)
+			}
+		}
+		s.notifier.NewPullComment(r.Context(), comment, mentions)
 
 		s.pages.HxLocation(w, fmt.Sprintf("/%s/pulls/%d#comment-%d", f.OwnerSlashRepo(), pull.PullId, commentId))
 		return