API endpoint for subscribers (#598)

routers/api/v1/repo/subscriber.go

@@ -0,0 +1,25 @@
+// Copyright 2017 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 repo
+
+import (
+	api "code.gitea.io/sdk/gitea"
+
+	"code.gitea.io/gitea/modules/context"
+)
+
+// ListSubscribers list a repo's subscribers (i.e. watchers)
+func ListSubscribers(ctx *context.APIContext) {
+	subscribers, err := ctx.Repo.Repository.GetWatchers(0)
+	if err != nil {
+		ctx.Error(500, "GetWatchers", err)
+		return
+	}
+	users := make([]*api.User, len(subscribers))
+	for i, subscriber := range subscribers {
+		users[i] = subscriber.APIFormat()
+	}
+	ctx.JSON(200, users)
+}