diff --git a/src/main/scala/gitbucket/core/controller/ApiController.scala b/src/main/scala/gitbucket/core/controller/ApiController.scala
index eb585fb..eddd941 100644
--- a/src/main/scala/gitbucket/core/controller/ApiController.scala
+++ b/src/main/scala/gitbucket/core/controller/ApiController.scala
@@ -35,7 +35,7 @@
   with GroupManagerAuthenticator
   with ReferrerAuthenticator
   with ReadableUsersAuthenticator
-  with CollaboratorsAuthenticator
+  with WritableUsersAuthenticator
 
 trait ApiControllerBase extends ControllerBase {
   self: RepositoryService
@@ -52,7 +52,7 @@
     with GroupManagerAuthenticator
     with ReferrerAuthenticator
     with ReadableUsersAuthenticator
-    with CollaboratorsAuthenticator =>
+    with WritableUsersAuthenticator =>
 
   /**
     * https://developer.github.com/v3/#root-endpoint
@@ -328,7 +328,7 @@
    * Create a label
    * https://developer.github.com/v3/issues/labels/#create-a-label
    */
-  post("/api/v3/repos/:owner/:repository/labels")(collaboratorsOnly { repository =>
+  post("/api/v3/repos/:owner/:repository/labels")(writableUsersOnly { repository =>
     (for{
       data <- extractFromJsonBody[CreateALabel] if data.isValid
     } yield {
@@ -353,7 +353,7 @@
    * Update a label
    * https://developer.github.com/v3/issues/labels/#update-a-label
    */
-  patch("/api/v3/repos/:owner/:repository/labels/:labelName")(collaboratorsOnly { repository =>
+  patch("/api/v3/repos/:owner/:repository/labels/:labelName")(writableUsersOnly { repository =>
     (for{
       data <- extractFromJsonBody[CreateALabel] if data.isValid
     } yield {
@@ -379,7 +379,7 @@
    * Delete a label
    * https://developer.github.com/v3/issues/labels/#delete-a-label
    */
-  delete("/api/v3/repos/:owner/:repository/labels/:labelName")(collaboratorsOnly { repository =>
+  delete("/api/v3/repos/:owner/:repository/labels/:labelName")(writableUsersOnly { repository =>
     LockUtil.lock(RepositoryName(repository).fullName) {
       getLabel(repository.owner, repository.name, params("labelName")).map { label =>
         deleteLabel(repository.owner, repository.name, label.labelId)
@@ -467,7 +467,7 @@
   /**
    * https://developer.github.com/v3/repos/statuses/#create-a-status
    */
-  post("/api/v3/repos/:owner/:repo/statuses/:sha")(collaboratorsOnly { repository =>
+  post("/api/v3/repos/:owner/:repo/statuses/:sha")(writableUsersOnly { repository =>
     (for{
       ref <- params.get("sha")
       sha <- JGitUtil.getShaByRef(repository.owner, repository.name, ref)
diff --git a/src/main/scala/gitbucket/core/controller/IssuesController.scala b/src/main/scala/gitbucket/core/controller/IssuesController.scala
index a4b01f2..90aca13 100644
--- a/src/main/scala/gitbucket/core/controller/IssuesController.scala
+++ b/src/main/scala/gitbucket/core/controller/IssuesController.scala
@@ -15,11 +15,11 @@
 
 class IssuesController extends IssuesControllerBase
   with IssuesService with RepositoryService with AccountService with LabelsService with MilestonesService with ActivityService with HandleCommentService
-  with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator with PullRequestService with WebHookIssueCommentService
+  with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator with PullRequestService with WebHookIssueCommentService
 
 trait IssuesControllerBase extends ControllerBase {
   self: IssuesService with RepositoryService with AccountService with LabelsService with MilestonesService with ActivityService with HandleCommentService
-    with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator with PullRequestService with WebHookIssueCommentService =>
+    with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator with PullRequestService with WebHookIssueCommentService =>
 
   case class IssueCreateForm(title: String, content: Option[String],
     assignedUserName: Option[String], milestoneId: Option[Int], labelNames: Option[String])
@@ -258,32 +258,32 @@
     } getOrElse NotFound()
   })
 
-  ajaxPost("/:owner/:repository/issues/new/label")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/new/label")(writableUsersOnly { repository =>
     val labelNames = params("labelNames").split(",")
     val labels = getLabels(repository.owner, repository.name).filter(x => labelNames.contains(x.labelName))
     html.labellist(labels)
   })
 
-  ajaxPost("/:owner/:repository/issues/:id/label/new")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/:id/label/new")(writableUsersOnly { repository =>
     defining(params("id").toInt){ issueId =>
       registerIssueLabel(repository.owner, repository.name, issueId, params("labelId").toInt)
       html.labellist(getIssueLabels(repository.owner, repository.name, issueId))
     }
   })
 
-  ajaxPost("/:owner/:repository/issues/:id/label/delete")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/:id/label/delete")(writableUsersOnly { repository =>
     defining(params("id").toInt){ issueId =>
       deleteIssueLabel(repository.owner, repository.name, issueId, params("labelId").toInt)
       html.labellist(getIssueLabels(repository.owner, repository.name, issueId))
     }
   })
 
-  ajaxPost("/:owner/:repository/issues/:id/assign")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/:id/assign")(writableUsersOnly { repository =>
     updateAssignedUserName(repository.owner, repository.name, params("id").toInt, assignedUserName("assignedUserName"))
     Ok("updated")
   })
 
-  ajaxPost("/:owner/:repository/issues/:id/milestone")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/:id/milestone")(writableUsersOnly { repository =>
     updateMilestoneId(repository.owner, repository.name, params("id").toInt, milestoneId("milestoneId"))
     milestoneId("milestoneId").map { milestoneId =>
       getMilestonesWithIssueCount(repository.owner, repository.name)
@@ -293,7 +293,7 @@
     } getOrElse Ok()
   })
 
-  post("/:owner/:repository/issues/batchedit/state")(collaboratorsOnly { repository =>
+  post("/:owner/:repository/issues/batchedit/state")(writableUsersOnly { repository =>
     defining(params.get("value")){ action =>
       action match {
         case Some("open")  => executeBatch(repository) { issueId =>
@@ -311,7 +311,7 @@
     }
   })
 
-  post("/:owner/:repository/issues/batchedit/label")(collaboratorsOnly { repository =>
+  post("/:owner/:repository/issues/batchedit/label")(writableUsersOnly { repository =>
     params("value").toIntOpt.map{ labelId =>
       executeBatch(repository) { issueId =>
         getIssueLabel(repository.owner, repository.name, issueId, labelId) getOrElse {
@@ -321,7 +321,7 @@
     } getOrElse NotFound()
   })
 
-  post("/:owner/:repository/issues/batchedit/assign")(collaboratorsOnly { repository =>
+  post("/:owner/:repository/issues/batchedit/assign")(writableUsersOnly { repository =>
     defining(assignedUserName("value")){ value =>
       executeBatch(repository) {
         updateAssignedUserName(repository.owner, repository.name, _, value)
@@ -329,7 +329,7 @@
     }
   })
 
-  post("/:owner/:repository/issues/batchedit/milestone")(collaboratorsOnly { repository =>
+  post("/:owner/:repository/issues/batchedit/milestone")(writableUsersOnly { repository =>
     defining(milestoneId("value")){ value =>
       executeBatch(repository) {
         updateMilestoneId(repository.owner, repository.name, _, value)
diff --git a/src/main/scala/gitbucket/core/controller/LabelsController.scala b/src/main/scala/gitbucket/core/controller/LabelsController.scala
index 9b17841..ab658eb 100644
--- a/src/main/scala/gitbucket/core/controller/LabelsController.scala
+++ b/src/main/scala/gitbucket/core/controller/LabelsController.scala
@@ -2,7 +2,7 @@
 
 import gitbucket.core.issues.labels.html
 import gitbucket.core.service.{RepositoryService, AccountService, IssuesService, LabelsService}
-import gitbucket.core.util.{ReferrerAuthenticator, CollaboratorsAuthenticator}
+import gitbucket.core.util.{ReferrerAuthenticator, WritableUsersAuthenticator}
 import gitbucket.core.util.Implicits._
 import io.github.gitbucket.scalatra.forms._
 import org.scalatra.i18n.Messages
@@ -10,11 +10,11 @@
 
 class LabelsController extends LabelsControllerBase
   with LabelsService with IssuesService with RepositoryService with AccountService
-with ReferrerAuthenticator with CollaboratorsAuthenticator
+with ReferrerAuthenticator with WritableUsersAuthenticator
 
 trait LabelsControllerBase extends ControllerBase {
   self: LabelsService with IssuesService with RepositoryService
-    with ReferrerAuthenticator with CollaboratorsAuthenticator =>
+    with ReferrerAuthenticator with WritableUsersAuthenticator =>
 
   case class LabelForm(labelName: String, color: String)
 
@@ -32,11 +32,11 @@
       hasWritePermission(repository.owner, repository.name, context.loginAccount))
   })
 
-  ajaxGet("/:owner/:repository/issues/labels/new")(collaboratorsOnly { repository =>
+  ajaxGet("/:owner/:repository/issues/labels/new")(writableUsersOnly { repository =>
     html.edit(None, repository)
   })
 
-  ajaxPost("/:owner/:repository/issues/labels/new", labelForm)(collaboratorsOnly { (form, repository) =>
+  ajaxPost("/:owner/:repository/issues/labels/new", labelForm)(writableUsersOnly { (form, repository) =>
     val labelId = createLabel(repository.owner, repository.name, form.labelName, form.color.substring(1))
     html.label(
       getLabel(repository.owner, repository.name, labelId).get,
@@ -46,13 +46,13 @@
       hasWritePermission(repository.owner, repository.name, context.loginAccount))
   })
 
-  ajaxGet("/:owner/:repository/issues/labels/:labelId/edit")(collaboratorsOnly { repository =>
+  ajaxGet("/:owner/:repository/issues/labels/:labelId/edit")(writableUsersOnly { repository =>
     getLabel(repository.owner, repository.name, params("labelId").toInt).map { label =>
       html.edit(Some(label), repository)
     } getOrElse NotFound()
   })
 
-  ajaxPost("/:owner/:repository/issues/labels/:labelId/edit", labelForm)(collaboratorsOnly { (form, repository) =>
+  ajaxPost("/:owner/:repository/issues/labels/:labelId/edit", labelForm)(writableUsersOnly { (form, repository) =>
     updateLabel(repository.owner, repository.name, params("labelId").toInt, form.labelName, form.color.substring(1))
     html.label(
       getLabel(repository.owner, repository.name, params("labelId").toInt).get,
@@ -62,7 +62,7 @@
       hasWritePermission(repository.owner, repository.name, context.loginAccount))
   })
 
-  ajaxPost("/:owner/:repository/issues/labels/:labelId/delete")(collaboratorsOnly { repository =>
+  ajaxPost("/:owner/:repository/issues/labels/:labelId/delete")(writableUsersOnly { repository =>
     deleteLabel(repository.owner, repository.name, params("labelId").toInt)
     Ok()
   })
diff --git a/src/main/scala/gitbucket/core/controller/MilestonesController.scala b/src/main/scala/gitbucket/core/controller/MilestonesController.scala
index 323b114..f75ea60 100644
--- a/src/main/scala/gitbucket/core/controller/MilestonesController.scala
+++ b/src/main/scala/gitbucket/core/controller/MilestonesController.scala
@@ -2,17 +2,17 @@
 
 import gitbucket.core.issues.milestones.html
 import gitbucket.core.service.{RepositoryService, MilestonesService, AccountService}
-import gitbucket.core.util.{ReferrerAuthenticator, CollaboratorsAuthenticator}
+import gitbucket.core.util.{ReferrerAuthenticator, WritableUsersAuthenticator}
 import gitbucket.core.util.Implicits._
 import io.github.gitbucket.scalatra.forms._
 
 class MilestonesController extends MilestonesControllerBase
   with MilestonesService with RepositoryService with AccountService
-  with ReferrerAuthenticator with CollaboratorsAuthenticator
+  with ReferrerAuthenticator with WritableUsersAuthenticator
 
 trait MilestonesControllerBase extends ControllerBase {
   self: MilestonesService with RepositoryService
-    with ReferrerAuthenticator with CollaboratorsAuthenticator  =>
+    with ReferrerAuthenticator with WritableUsersAuthenticator  =>
 
   case class MilestoneForm(title: String, description: Option[String], dueDate: Option[java.util.Date])
 
@@ -30,22 +30,22 @@
       hasWritePermission(repository.owner, repository.name, context.loginAccount))
   })
 
-  get("/:owner/:repository/issues/milestones/new")(collaboratorsOnly {
+  get("/:owner/:repository/issues/milestones/new")(writableUsersOnly {
     html.edit(None, _)
   })
 
-  post("/:owner/:repository/issues/milestones/new", milestoneForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/issues/milestones/new", milestoneForm)(writableUsersOnly { (form, repository) =>
     createMilestone(repository.owner, repository.name, form.title, form.description, form.dueDate)
     redirect(s"/${repository.owner}/${repository.name}/issues/milestones")
   })
 
-  get("/:owner/:repository/issues/milestones/:milestoneId/edit")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/issues/milestones/:milestoneId/edit")(writableUsersOnly { repository =>
     params("milestoneId").toIntOpt.map{ milestoneId =>
       html.edit(getMilestone(repository.owner, repository.name, milestoneId), repository)
     } getOrElse NotFound()
   })
 
-  post("/:owner/:repository/issues/milestones/:milestoneId/edit", milestoneForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/issues/milestones/:milestoneId/edit", milestoneForm)(writableUsersOnly { (form, repository) =>
     params("milestoneId").toIntOpt.flatMap{ milestoneId =>
       getMilestone(repository.owner, repository.name, milestoneId).map { milestone =>
         updateMilestone(milestone.copy(title = form.title, description = form.description, dueDate = form.dueDate))
@@ -54,7 +54,7 @@
     } getOrElse NotFound()
   })
 
-  get("/:owner/:repository/issues/milestones/:milestoneId/close")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/issues/milestones/:milestoneId/close")(writableUsersOnly { repository =>
     params("milestoneId").toIntOpt.flatMap{ milestoneId =>
       getMilestone(repository.owner, repository.name, milestoneId).map { milestone =>
         closeMilestone(milestone)
@@ -63,7 +63,7 @@
     } getOrElse NotFound()
   })
 
-  get("/:owner/:repository/issues/milestones/:milestoneId/open")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/issues/milestones/:milestoneId/open")(writableUsersOnly { repository =>
     params("milestoneId").toIntOpt.flatMap{ milestoneId =>
       getMilestone(repository.owner, repository.name, milestoneId).map { milestone =>
         openMilestone(milestone)
@@ -72,7 +72,7 @@
     } getOrElse NotFound()
   })
 
-  get("/:owner/:repository/issues/milestones/:milestoneId/delete")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/issues/milestones/:milestoneId/delete")(writableUsersOnly { repository =>
     params("milestoneId").toIntOpt.flatMap{ milestoneId =>
       getMilestone(repository.owner, repository.name, milestoneId).map { milestone =>
         deleteMilestone(repository.owner, repository.name, milestone.milestoneId)
diff --git a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
index ae26bb0..548da42 100644
--- a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
+++ b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
@@ -25,14 +25,14 @@
 class PullRequestsController extends PullRequestsControllerBase
   with RepositoryService with AccountService with IssuesService with PullRequestService with MilestonesService with LabelsService
   with CommitsService with ActivityService with WebHookPullRequestService
-  with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator
+  with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator
   with CommitStatusService with MergeService with ProtectedBranchService
 
 
 trait PullRequestsControllerBase extends ControllerBase {
   self: RepositoryService with AccountService with IssuesService with MilestonesService with LabelsService
     with CommitsService with ActivityService with PullRequestService with WebHookPullRequestService
-    with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator
+    with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator
     with CommitStatusService with MergeService with ProtectedBranchService =>
 
   val pullRequestForm = mapping(
@@ -141,7 +141,7 @@
     } getOrElse NotFound()
   })
 
-  get("/:owner/:repository/pull/:id/delete/*")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/pull/:id/delete/*")(writableUsersOnly { repository =>
     params("id").toIntOpt.map { issueId =>
       val branchName = multiParams("splat").head
       val userName   = context.loginAccount.get.userName
@@ -225,7 +225,7 @@
     }) getOrElse NotFound()
   })
 
-  post("/:owner/:repository/pull/:id/merge", mergeForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/pull/:id/merge", mergeForm)(writableUsersOnly { (form, repository) =>
     params("id").toIntOpt.flatMap { issueId =>
       val owner = repository.owner
       val name  = repository.name
@@ -389,7 +389,7 @@
     }) getOrElse NotFound()
   })
 
-  ajaxGet("/:owner/:repository/compare/*...*/mergecheck")(collaboratorsOnly { forkedRepository =>
+  ajaxGet("/:owner/:repository/compare/*...*/mergecheck")(writableUsersOnly { forkedRepository =>
     val Seq(origin, forked) = multiParams("splat")
     val (originOwner, tmpOriginBranch) = parseCompareIdentifie(origin, forkedRepository.owner)
     val (forkedOwner, tmpForkedBranch) = parseCompareIdentifie(forked, forkedRepository.owner)
diff --git a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
index 63b904e..d575c68 100644
--- a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
@@ -31,7 +31,7 @@
 
 class RepositoryViewerController extends RepositoryViewerControllerBase
   with RepositoryService with AccountService with ActivityService with IssuesService with WebHookService with CommitsService
-  with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator with PullRequestService with CommitStatusService
+  with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator with PullRequestService with CommitStatusService
   with WebHookPullRequestService with WebHookPullRequestReviewCommentService with ProtectedBranchService
 
 /**
@@ -39,7 +39,7 @@
  */
 trait RepositoryViewerControllerBase extends ControllerBase {
   self: RepositoryService with AccountService with ActivityService with IssuesService with WebHookService with CommitsService
-    with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator with PullRequestService with CommitStatusService
+    with ReadableUsersAuthenticator with ReferrerAuthenticator with WritableUsersAuthenticator with PullRequestService with CommitStatusService
     with WebHookPullRequestService with WebHookPullRequestReviewCommentService with ProtectedBranchService =>
 
   ArchiveCommand.registerFormat("zip", new ZipFormat)
@@ -157,7 +157,7 @@
     }
   })
 
-  get("/:owner/:repository/new/*")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/new/*")(writableUsersOnly { repository =>
     val (branch, path) = repository.splitPath(multiParams("splat").head)
     val protectedBranch = getProtectedBranchInfo(repository.owner, repository.name, branch).needStatusCheck(context.loginAccount.get.userName)
     html.editor(branch, repository, if(path.length == 0) Nil else path.split("/").toList,
@@ -165,7 +165,7 @@
       protectedBranch)
   })
 
-  get("/:owner/:repository/edit/*")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/edit/*")(writableUsersOnly { repository =>
     val (branch, path) = repository.splitPath(multiParams("splat").head)
     val protectedBranch = getProtectedBranchInfo(repository.owner, repository.name, branch).needStatusCheck(context.loginAccount.get.userName)
 
@@ -181,7 +181,7 @@
     }
   })
 
-  get("/:owner/:repository/remove/*")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/remove/*")(writableUsersOnly { repository =>
     val (branch, path) = repository.splitPath(multiParams("splat").head)
     using(Git.open(getRepositoryDir(repository.owner, repository.name))){ git =>
       val revCommit = JGitUtil.getRevCommitFromId(git, git.getRepository.resolve(branch))
@@ -194,7 +194,7 @@
     }
   })
 
-  post("/:owner/:repository/create", editorForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/create", editorForm)(writableUsersOnly { (form, repository) =>
     commitFile(
       repository  = repository,
       branch      = form.branch,
@@ -211,7 +211,7 @@
     }")
   })
 
-  post("/:owner/:repository/update", editorForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/update", editorForm)(writableUsersOnly { (form, repository) =>
     commitFile(
       repository  = repository,
       branch      = form.branch,
@@ -232,7 +232,7 @@
     }")
   })
 
-  post("/:owner/:repository/remove", deleteForm)(collaboratorsOnly { (form, repository) =>
+  post("/:owner/:repository/remove", deleteForm)(writableUsersOnly { (form, repository) =>
     commitFile(repository, form.branch, form.path, None, Some(form.fileName), "", "",
       form.message.getOrElse(s"Delete ${form.fileName}"))
 
@@ -443,7 +443,7 @@
   /**
    * Creates a branch.
    */
-  post("/:owner/:repository/branches")(collaboratorsOnly { repository =>
+  post("/:owner/:repository/branches")(writableUsersOnly { repository =>
     val newBranchName = params.getOrElse("new", halt(400))
     val fromBranchName = params.getOrElse("from", halt(400))
     using(Git.open(getRepositoryDir(repository.owner, repository.name))){ git =>
@@ -461,7 +461,7 @@
   /**
    * Deletes branch.
    */
-  get("/:owner/:repository/delete/*")(collaboratorsOnly { repository =>
+  get("/:owner/:repository/delete/*")(writableUsersOnly { repository =>
     val branchName = multiParams("splat").head
     val userName   = context.loginAccount.get.userName
     if(repository.repository.defaultBranch != branchName){
diff --git a/src/main/scala/gitbucket/core/controller/WikiController.scala b/src/main/scala/gitbucket/core/controller/WikiController.scala
index beebfc2..64d0b27 100644
--- a/src/main/scala/gitbucket/core/controller/WikiController.scala
+++ b/src/main/scala/gitbucket/core/controller/WikiController.scala
@@ -14,10 +14,10 @@
 
 class WikiController extends WikiControllerBase 
   with WikiService with RepositoryService with AccountService with ActivityService
-  with ReadableUsersAuthenticator with CollaboratorsAuthenticator with ReferrerAuthenticator
+  with ReadableUsersAuthenticator with ReferrerAuthenticator
 
 trait WikiControllerBase extends ControllerBase {
-  self: WikiService with RepositoryService with ActivityService with ReadableUsersAuthenticator with CollaboratorsAuthenticator with ReferrerAuthenticator =>
+  self: WikiService with RepositoryService with ActivityService with ReadableUsersAuthenticator with ReferrerAuthenticator =>
 
   case class WikiPageEditForm(pageName: String, content: String, message: Option[String], currentPageName: String, id: String)
   
diff --git a/src/main/scala/gitbucket/core/util/Authenticator.scala b/src/main/scala/gitbucket/core/util/Authenticator.scala
index 6d82508..b4cfef5 100644
--- a/src/main/scala/gitbucket/core/util/Authenticator.scala
+++ b/src/main/scala/gitbucket/core/util/Authenticator.scala
@@ -89,32 +89,6 @@
 }
 
 /**
- * Allows only collaborators and administrators.
- *
- * TODO This authenticator should be renamed.
- */
-trait CollaboratorsAuthenticator { self: ControllerBase with RepositoryService with AccountService =>
-  protected def collaboratorsOnly(action: (RepositoryInfo) => Any) = { authenticate(action) }
-  protected def collaboratorsOnly[T](action: (T, RepositoryInfo) => Any) = (form: T) => { authenticate(action(form, _)) }
-
-  private def authenticate(action: (RepositoryInfo) => Any) = {
-    {
-      defining(request.paths){ paths =>
-        getRepository(paths(0), paths(1)).map { repository =>
-          context.loginAccount match {
-            case Some(x) if(x.isAdmin) => action(repository)
-            case Some(x) if(paths(0) == x.userName) => action(repository)
-            case Some(x) if(getGroupMembers(repository.owner).exists(_.userName == x.userName)) => action(repository)
-            case Some(x) if(getCollaboratorUserNames(paths(0), paths(1), Seq(Permission.ADMIN, Permission.WRITE)).contains(x.userName)) => action(repository)
-            case _ => Unauthorized()
-          }
-        } getOrElse NotFound()
-      }
-    }
-  }
-}
-
-/**
  * Allows only guests and signed in users who can access the repository.
  */
 trait ReferrerAuthenticator { self: ControllerBase with RepositoryService with AccountService =>
@@ -143,7 +117,7 @@
 }
 
 /**
- * Allows only signed in users who can access the repository.
+ * Allows only signed in users who have read permission for the repository.
  */
 trait ReadableUsersAuthenticator { self: ControllerBase with RepositoryService with AccountService =>
   protected def readableUsersOnly(action: (RepositoryInfo) => Any) = { authenticate(action) }
@@ -168,6 +142,30 @@
 }
 
 /**
+ * Allows only signed in users who have write permission for the repository.
+ */
+trait WritableUsersAuthenticator { self: ControllerBase with RepositoryService with AccountService =>
+  protected def writableUsersOnly(action: (RepositoryInfo) => Any) = { authenticate(action) }
+  protected def writableUsersOnly[T](action: (T, RepositoryInfo) => Any) = (form: T) => { authenticate(action(form, _)) }
+
+  private def authenticate(action: (RepositoryInfo) => Any) = {
+    {
+      defining(request.paths){ paths =>
+        getRepository(paths(0), paths(1)).map { repository =>
+          context.loginAccount match {
+            case Some(x) if(x.isAdmin) => action(repository)
+            case Some(x) if(paths(0) == x.userName) => action(repository)
+            case Some(x) if(getGroupMembers(repository.owner).exists(_.userName == x.userName)) => action(repository)
+            case Some(x) if(getCollaboratorUserNames(paths(0), paths(1), Seq(Permission.ADMIN, Permission.WRITE)).contains(x.userName)) => action(repository)
+            case _ => Unauthorized()
+          }
+        } getOrElse NotFound()
+      }
+    }
+  }
+}
+
+/**
  * Allows only the group managers.
  */
 trait GroupManagerAuthenticator { self: ControllerBase with AccountService =>