Fixes #2603 - Limit access to KB Categories based on roles.

app/assets/javascripts/app/controllers/knowledge_base/agent_controller.coffee

@@ -11,6 +11,10 @@ class App.KnowledgeBaseAgentController extends App.Controller
     super
     @controllerBind('config_update_local', (data) => @configUpdated(data))
 
+    @listenTo App.User.current(), 'refresh', @visibilityMayHaveChanged
+
+    App.Event.bind 'kb_visibility_may_have_changed', @visibilityMayHaveChanged
+
     if @permissionCheck('knowledge_base.*') and App.Config.get('kb_active')
       @updateNavMenu()
     else if App.Config.get('kb_active_publicly')
@@ -51,15 +55,8 @@ class App.KnowledgeBaseAgentController extends App.Controller
         @loadChange(pushed_data)
       , 1000, key, 'kb_data_changed_loading')
     )
-    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', =>
+    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', @renderAfterChangeLoaded
-      return if !@displayingError
+    @listenTo App.KnowledgeBase, 'kb_visibility_change_loaded', @renderAfterChangeLoaded
-
-      object = @constructor.pickObjectUsing(@lastParams, @)
-
-      if !@objectVisibleInternally(object)
-        return
-
-      @renderControllers(@lastParams)
 
     @checkForUpdates()
 
@@ -112,6 +109,19 @@ class App.KnowledgeBaseAgentController extends App.Controller
   notifyChangeLoaded: ->
     App.KnowledgeBase.trigger('kb_data_change_loaded')
 
+  notifyVisibilityChangeLoaded: ->
+    App.KnowledgeBase.trigger('kb_visibility_change_loaded')
+
+  renderAfterChangeLoaded: =>
+    return if !@displayingError
+
+    object = @constructor.pickObjectUsing(@lastParams, @)
+
+    if !@objectVisibleInternally(object)
+      return
+
+    @renderControllers(@lastParams)
+
   active: (state) ->
     return @shown if state is undefined
     @shown = state
@@ -138,6 +148,10 @@ class App.KnowledgeBaseAgentController extends App.Controller
     if !@permissionCheckRedirect("knowledge_base.#{@requiredPermissionSuffix(params)}")
       return
 
+    if @loaded && @requiredPermissionSuffix(params) == 'editor' && @access(params) != 'editor'
+      @navigate params.match[0].replace(/\/edit$/, ''), { hideCurrentLocationFromHistory: true }
+      return
+
     if @loaded && @rendered && @lastParams && !params.knowledge_base_id && @contentController && @kb_locale()?
       @navigate @lastParams.match[0] , { hideCurrentLocationFromHistory: true }
       return
@@ -169,6 +183,7 @@ class App.KnowledgeBaseAgentController extends App.Controller
       @pendingParams = params
 
   renderScreenErrorInContent: (text) ->
+    @contentController?.releaseController()
     @contentController = undefined
     @renderScreenError(detail: text, el: @$('.page-content'))
     @displayingError = true
@@ -255,12 +270,12 @@ class App.KnowledgeBaseAgentController extends App.Controller
       kb.kb_locales().filter((elem) =>  elem.system_locale_id == @lastParams.selectedSystemLocale.id)[0]
 
   getKnowledgeBase: ->
-    App.KnowledgeBase.find(@lastParams.knowledge_base_id)
+    App.KnowledgeBase.find(@lastParams?.knowledge_base_id)
 
   fetchAndRender: =>
     @fetch(true, true)
 
-  fetch: (showLoader, processLoaded) ->
+  fetch: (showLoader, processLoaded, notifyVisibilityChangeLoaded) ->
     if showLoader
       @startLoading()
 
@@ -278,6 +293,9 @@ class App.KnowledgeBaseAgentController extends App.Controller
 
         if processLoaded
           @processLoaded()
+
+        if notifyVisibilityChangeLoaded
+          @notifyVisibilityChangeLoaded()
       ,
       error: (xhr) =>
         if showLoader
@@ -308,10 +326,11 @@ class App.KnowledgeBaseAgentController extends App.Controller
         App[elem.modelName].find(id)?.remove(clear: true)
 
   calculateIdsToDelete: (data) ->
-    Object
+    App.KnowledgeBase
-      .keys(data)
+      .allKbModelNames()
-      .filter (elem) -> elem.match(/^KnowledgeBase/)
       .map (model) ->
+        return {ids : []} if !data[model]
+
         newIds = Object.keys data[model]
         oldIds = App[model].all().map (elem) -> elem.id
         diff   = oldIds.filter (elem) -> !_.includes(newIds, String(elem))
@@ -339,8 +358,13 @@ class App.KnowledgeBaseAgentController extends App.Controller
       parentController: @
     )
 
+  access: (params) ->
+    @constructor
+      .pickObjectUsing(params, @)
+      ?.access()
+
   isEditor: ->
-    App.User.current().permission('knowledge_base.editor')
+    @access(@lastParams) == 'editor'
 
   checkForUpdates: ->
     @interval(@checkUpdatesAction, 10 * 60 * 1000, 'kb_interval_check')
@@ -371,6 +395,27 @@ class App.KnowledgeBaseAgentController extends App.Controller
   clicked: ->
     window.open(App.KnowledgeBase.first().publicBaseUrl(), '_blank')
 
+  visibilityMayHaveChanged: =>
+    kb = @getKnowledgeBase()
+
+    return if !kb
+
+    @ajax
+      id:         'kb_pull_visibility'
+      type:       'GET'
+      url:         @apiPath + '/knowledge_bases/visible_ids'
+      processData: true
+      success:     (data, status, xhr) =>
+        didRemove       = kb.removeAssetsIfNeeded(data)
+        hasAssetsToLoad = kb.hasAssetsToLoad(data)
+
+        if hasAssetsToLoad
+          @fetch(false, false, true)
+          return
+
+        if didRemove
+          @notifyVisibilityChangeLoaded()
+
   @pickObjectUsing: (params, parentController) ->
     kb = parentController.getKnowledgeBase()
     return if !kb

app/assets/javascripts/app/controllers/knowledge_base/content_can_be_published_form.coffee

@@ -103,7 +103,7 @@ class App.KnowledgeBaseContentCanBePublishedForm extends App.ControllerForm
           ,
             value: 'internal'
             name:  __('Internal')
-            note:  __('Visible to agents & editors')
+            note:  __('Visible to readers & editors')
           ,
             value: 'published'
             name:  __('Public')

app/assets/javascripts/app/controllers/knowledge_base/editor_coordinator.coffee

@@ -15,6 +15,12 @@ class App.KnowledgeBaseEditorCoordinator
       parentController: @parentController
     )
 
+  clickedPermissions: (object) ->
+    new App.KnowledgeBasePermissionsDialog(
+      object:    object
+      container: @parentController.el
+    )
+
   # built-in Spine's function doesn't work when object has no ID set and includes "undefined" in URL
   urlFor: (object) ->
     if object.id

app/assets/javascripts/app/controllers/knowledge_base/navigation.coffee

@@ -13,8 +13,8 @@ class App.KnowledgeBaseNavigation extends App.Controller
 
     @controllerBind('knowledge_base::navigation::rerender', => @needsUpdate())
 
-    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', =>
+    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', @needsUpdate
-      @needsUpdate()
+    @listenTo App.KnowledgeBase, 'kb_visibility_change_loaded', @needsUpdate
 
   buildCrumbsForRendering: (array, kb_locale, action) ->
     if action is 'search'
@@ -73,7 +73,7 @@ class App.KnowledgeBaseNavigation extends App.Controller
     else
       false
 
-  needsUpdate: ->
+  needsUpdate: =>
     @show(@savedParams, @savedAction)
 
   selectedLocaleDisplay: ->

app/assets/javascripts/app/controllers/knowledge_base/permissions_dialog.coffee

@@ -0,0 +1,92 @@
+class App.KnowledgeBasePermissionsDialog extends App.ControllerModal
+  events:
+    #'submit form':          'submitPermissions'
+    'click td.u-clickable': 'cellBackgroundClicked'
+
+  head: 'Permissions'
+  includeForm: true
+  buttonSubmit: true
+  accessLevels: { editor: 'Editor', reader: 'Reader', none: 'None' }
+
+  cellBackgroundClicked: (e) ->
+    return if e.target != e.currentTarget
+
+    e.preventDefault()
+    e.currentTarget.querySelector('input')?.click()
+
+  data: null
+
+  constructor: (params) ->
+    super
+
+    @load()
+
+  content: =>
+    return if !@data
+
+    App.view('knowledge_base/permissions_dialog')(
+      accessLevels: @accessLevels
+      params: @loadedParams(@data)
+      roles: @formRoles(@data)
+    )
+
+  loadedParams: (data) ->
+    params = []
+
+    for permission in data.permissions
+      params[permission.role_id] = permission.access
+
+    for role in data.roles_editor
+      params[role.id] ||= 'editor'
+
+    for role in data.roles_reader
+      params[role.id] ||= 'reader'
+
+    params
+
+  formRoles: (data) ->
+    data.roles_editor.forEach (elem) => @formRolesItem(elem, 'editor', data)
+    data.roles_reader.forEach (elem) => @formRolesItem(elem, 'reader', data)
+
+    _.sortBy data.roles_editor.concat(data.roles_reader), (elem) -> elem.name
+
+  formRolesItem: (elem, role_name, data) ->
+    elem.accessLevel = role_name
+    elem.limit = _.findWhere(data.inherited, { role_id: elem.id })?.access
+
+  load: =>
+    @ajax(
+      id:          'knowledge_base_permissions_get'
+      type:        'get'
+      url:         @object.generateURL('permissions')
+      processData: true
+      success:     (data, status, xhr) =>
+        @data = data
+        @update()
+      error:       (xhr) =>
+        @showAlert(xhr.responseJSON?.error || __('Unable to load changes'))
+    )
+
+  toggleDisabled: (state) =>
+    @el.find('input, button').attr('disabled', state)
+
+  onSubmit: (e) =>
+    @clearAlerts()
+    @toggleDisabled(true)
+
+    data = @formParams()
+
+    params = { permissions_dialog: { permissions: data } }
+
+    @ajax(
+      id:          'knowledge_base_permissions_patch'
+      type:        'PATCH'
+      data:        JSON.stringify(params)
+      url:         @object.generateURL('permissions')
+      processData: true
+      success:     (data, status, xhr) =>
+        @close()
+      error:       (xhr) =>
+        @toggleDisabled(false)
+        @showAlert(xhr.responseJSON?.error || __('Unable to save changes'))
+    )

app/assets/javascripts/app/controllers/knowledge_base/reader_controller.coffee

@@ -54,7 +54,10 @@ class App.KnowledgeBaseReaderController extends App.Controller
     @listenTo App.KnowledgeBase, 'kb_data_change_loaded', =>
       @renderAnswer(@object, kb_locale)
 
-  renderAnswer: (answer, kb_locale) ->
+    @listenTo App.KnowledgeBase, 'kb_visibility_change_loaded', =>
+      @renderAnswer(@object, kb_locale, true)
+
+  renderAnswer: (answer, kb_locale, onlyVisibility) ->
     if !answer
       @parentController.renderNotFound()
       return
@@ -63,13 +66,16 @@ class App.KnowledgeBaseReaderController extends App.Controller
       @parentController.renderNotAvailableAnymore()
       return
 
+    paginator = new App.KnowledgeBaseReaderPagination(object: @object, kb_locale: kb_locale)
+    @answerPagination.html paginator.el
+
+    if onlyVisibility
+      return
+
     @renderAttachments(answer.attachments)
     @renderTags(answer.tags)
     @renderLinkedTickets(answer.translation(kb_locale.id)?.linked_tickets())
 
-    paginator = new App.KnowledgeBaseReaderPagination(object: @object, kb_locale: kb_locale)
-    @answerPagination.html paginator.el
-
     answer_translation = answer.translation(kb_locale.id)
 
     if !answer_translation

app/assets/javascripts/app/controllers/knowledge_base/reader_list_container.coffee

@@ -3,13 +3,13 @@ class App.KnowledgeBaseReaderListContainer extends App.Controller
     super
     @render()
 
-    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', =>
+    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', @parentRefreshed
-      @parentRefreshed()
+    @listenTo App.KnowledgeBase, 'kb_visibility_change_loaded', @parentRefreshed
 
   tag:       'ul'
   className: 'sections'
 
-  parentRefreshed: ->
+  parentRefreshed: =>
     newIds = @children().map (elem) -> elem.id
     oldIds = @el.children().toArray().map (elem) -> parseInt(elem.dataset.id)
 
@@ -59,7 +59,9 @@ class App.KnowledgeBaseReaderListContainer.Categories extends App.KnowledgeBaseR
               @parent.children()
             else
               []
+
     # coffeelint: enable=indentation
+    #
 
     if !@isEditor
       items = items.filter (elem) => elem.visibleInternally(@kb_locale)

app/assets/javascripts/app/controllers/knowledge_base/reader_list_controller.coffee

@@ -3,9 +3,16 @@ class App.KnowledgeBaseReaderListController extends App.Controller
     super
     @render()
 
-    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', =>
+    @listenTo App.KnowledgeBase, 'kb_data_change_loaded', @changeLoaded
+    @listenTo App.KnowledgeBase, 'kb_visibility_may_have_changed', => @changeLoaded(true)
+
+  changeLoaded: =>
     if !@objectVisibleInternally()
       @parentController.renderNotAvailableAnymore()
+      return
+
+    if @renderEmptinessState != @object.isEmpty()
+      @render()
 
   elements:
     '.js-readerListContainer': 'container'
@@ -18,11 +25,13 @@ class App.KnowledgeBaseReaderListController extends App.Controller
       @parentController.renderNotFound()
       return
 
+    @renderEmptinessState = @object.isEmpty()
+
     if @object.isEmpty()
       @renderScreenPlaceholder(
         icon:   App.Utils.icon('mood-ok')
         detail: __('This category is empty')
-        action: __('Start Editing')
+        action: if @parentController.isEditor() then __('Start Editing')
         actionCallback: =>
           url = @object.uiUrl(@parentController.kb_locale(), 'edit')
           @navigate url

app/assets/javascripts/app/controllers/knowledge_base/reader_list_item.coffee

@@ -18,7 +18,10 @@ class App.KnowledgeBaseReaderListItem extends App.Controller
 
     @sort_order = @item.position
 
+    try
       attrs = @item.attributesForRendering(@kb_locale, isEditor: @isEditor)
+    catch e
+      attrs = {}
 
     @el
       .prop('className')

app/assets/javascripts/app/controllers/knowledge_base/sidebar.coffee

@@ -6,6 +6,7 @@ class App.KnowledgeBaseSidebar extends App.Controller
 
   constructor: ->
     super
+    @renderedWidgets = []
     @show()
 
     @controllerBind 'knowledge_base::sidebar::rerender', => @rerender()
@@ -14,9 +15,9 @@ class App.KnowledgeBaseSidebar extends App.Controller
       @rerender()
       true
 
-  rerender: ->
+  rerender: =>
     @delay( =>
-      @show(@savedParams, @savedAction)
+      @update()
     , 300, 'rerender')
 
   contentActionClicked: (e) ->
@@ -24,10 +25,15 @@ class App.KnowledgeBaseSidebar extends App.Controller
     actionName = switch e.target.dataset.action
                    when 'delete' then 'clickedDelete'
                    when 'visibility' then 'clickedCanBePublished'
+                   when 'permissions' then 'clickedPermissions'
     # coffeelint: enable=indentation
 
     @parentController.bodyModal = @parentController.coordinator[actionName]?(@savedParams)
 
+  update: =>
+    for elem in @renderedWidgets
+      elem.updateIfNeeded?()
+
   show: (object, action) ->
     isEdit = action is 'edit'
 
@@ -39,17 +45,22 @@ class App.KnowledgeBaseSidebar extends App.Controller
     if !isEdit
       return
 
-    for widget in @widgets(object)
+    @renderedWidgets = []
-      @el.append new widget(
+
+    for elem in @getWidgets(object)
+      widget = new elem(
         object:           object
         kb_locale:        @parentController.kb_locale()
         parentController: @parentController
-      ).el
+      )
+
+      @renderedWidgets.push widget
+      @el.append widget.el
 
   hide: ->
     @el.addClass('hidden')
 
-  widgets: (object) ->
+  getWidgets: (object) ->
     output = [App.KnowledgeBaseSidebarActions]
 
     if object instanceof App.KnowledgeBase || object instanceof App.KnowledgeBaseCategory

app/assets/javascripts/app/controllers/knowledge_base/sidebar/_generic_list.coffee

@@ -8,6 +8,9 @@ class App.KnowledgeBaseSidebarGenericList extends App.Controller
   constructor: ->
     super
 
+    @render()
+
+  render: ->
     @html App.view('knowledge_base/sidebar/generic_list')(@templateOptions())
 
   templateOptions: ->
@@ -52,3 +55,6 @@ class App.KnowledgeBaseSidebarGenericList extends App.Controller
 
   urlNew: ->
     #has to be overridden
+
+  updateIfNeeded: ->
+    @render()

app/assets/javascripts/app/controllers/knowledge_base/sidebar/attachments.coffee

@@ -19,9 +19,9 @@ class App.KnowledgeBaseSidebarAttachments extends App.Controller
     super
 
     @render()
-    @listenTo @object, 'refresh', @needsUpdate
+    @listenTo @object, 'refresh', @updateIfNeeded
 
-  needsUpdate: =>
+  updateIfNeeded: =>
     @render()
 
   render: ->

app/assets/javascripts/app/controllers/knowledge_base/sidebar/linked_tickets.coffee

@@ -12,9 +12,9 @@ class App.KnowledgeBaseSidebarLinkedTickets extends App.Controller
     super
 
     @render()
-    @listenTo @object, 'refresh', @needsUpdate
+    @listenTo @object, 'refresh', @updateIfNeeded
 
-  needsUpdate: =>
+  updateIfNeeded: =>
     @render()
 
   render: ->

app/assets/javascripts/app/controllers/knowledge_base/sidebar/tags.coffee

@@ -11,3 +11,6 @@ class App.KnowledgeBaseSidebarTags extends App.Controller
       object:      @object
       tags:        @object.tags
     )
+
+  updateIfNeeded: ->
+    @widget.reload(@object.tags)

app/assets/javascripts/app/lib/mixins/knowledge_base_access.coffee

@@ -0,0 +1,33 @@
+InstanceMethods =
+  access: ->
+    permission_reader = App.Permission.findByAttribute('name', 'knowledge_base.reader')
+    permission_editor = App.Permission.findByAttribute('name', 'knowledge_base.editor')
+
+    permissions_effective = switch @constructor
+      when App.KnowledgeBaseAnswer
+        @category().permissions_effective
+      when App.KnowledgeBaseCategory, App.KnowledgeBase
+        @permissions_effective
+
+    access = 'none'
+
+    for role_id in App.User.current().role_ids
+      kb_permission = _.findWhere(permissions_effective, { role_id: role_id })
+
+      if kb_permission
+        switch kb_permission.access
+          when 'editor'
+            return 'editor'
+          when 'reader'
+            access = 'reader'
+      else if role = App.Role.find(role_id)
+        if role.permission_ids.indexOf(permission_editor.id) > -1
+          return 'editor'
+        if role.permission_ids.indexOf(permission_reader.id) > -1
+          access = 'reader'
+
+    return access
+
+App.KnowledgeBaseAccess =
+  extended: ->
+    @include InstanceMethods

app/assets/javascripts/app/lib/mixins/knowledge_base_actions.coffee

@@ -11,6 +11,15 @@ InstanceMethods =
         disabled: @isNew()
       }
 
+    if (@ instanceof App.KnowledgeBaseCategory) || (@ instanceof App.KnowledgeBase)
+      buttons.push {
+        iconName: 'lock'
+        name:     'Permissions'
+        action:   'permissions'
+        cssClass: 'btn--success'
+        disabled: @isNew()
+      }
+
     if !(@ instanceof App.KnowledgeBase)
       buttons.push {
         iconName: 'trash'

app/assets/javascripts/app/lib/mixins/knowledge_base_translatable.coffee

@@ -34,12 +34,6 @@ InstanceMethods =
       attrs.iconFont = true
       attrs.icon     = @category_icon
       attrs.count    = @countDeepAnswers()
-
-      if options.isEditor
-        attrs.editorOnly = !@visibleInternally(kb_locale)
-      else
-        attrs.editorOnly = false
-
       attrs.state    = @visibilityState(kb_locale)
 
     if @ instanceof App.KnowledgeBaseAnswer
@@ -47,16 +41,6 @@ InstanceMethods =
       attrs.state = @can_be_published_state()
       attrs.tags  = @tags
 
-      if options.isEditor
-        attrs.editorOnly = !@is_internally_published(kb_locale)
-      else
-        attrs.editorOnly = false
-
-    # attrs.className = if attrs.missingTranslation
-    #                     'kb-item--missing-translation'
-    #                   else if attrs.editorOnly
-    #                     'kb-item--invisible'
-
     attrs.icons = {}
 
     if attrs.missingTranslation

app/assets/javascripts/app/models/knowledge_base.coffee

@@ -2,6 +2,7 @@ class App.KnowledgeBase extends App.Model
   @configure 'KnowledgeBase', 'iconset', 'color_highlight', 'color_header', 'color_header_link', 'translation_ids', 'locale_ids', 'homepage_layout', 'category_layout', 'custom_address'
   @extend Spine.Model.Ajax
   @extend App.KnowledgeBaseActions
+  @extend App.KnowledgeBaseAccess
   @url: @apiPath + '/knowledge_bases'
 
   @manageUrl: @apiPath + '/knowledge_bases/manage'
@@ -76,7 +77,7 @@ class App.KnowledgeBase extends App.Model
     , initial
 
   visibleInternally: (kb_locale) ->
-    @active
+    @active && @access() != 'none'
 
   visiblePublicly: (kb_locale) ->
     @active
@@ -88,6 +89,41 @@ class App.KnowledgeBase extends App.Model
 
     attrs
 
+  loadedAnswerIds: ->
+    App.KnowledgeBaseAnswer
+      .all()
+      .filter (elem) => elem.knowledge_base().id == @id
+      .map (elem) -> elem.id
+
+  loadedCategoryIds: ->
+    App.KnowledgeBaseCategory
+      .all()
+      .map (elem) -> elem.id
+
+  removeAssetsIfNeeded: (data) =>
+    removeAnswers    = _.difference @loadedAnswerIds(), data.answer_ids
+    removeCategories = _.difference @loadedAnswerIds(), data.category_ids
+
+    for answer_id in removeAnswers
+      App.KnowledgeBaseAnswer.find(answer_id)?.remove(clear: true)
+
+    for category_id in removeCategories
+      App.KnowledgeBaseCategory.find(category_id)?.remove(clear: true)
+
+    !_.isEmpty(removeAnswers) || !_.isEmpty(removeCategories)
+
+  hasAssetsToLoad: (data) =>
+    needsLoadingAnswers    = _.difference data.answer_ids, @loadedAnswerIds()
+    needsLoadingCategories = _.difference data.category_ids, @loadedCategoryIds()
+
+    !_.isEmpty(needsLoadingAnswers) || !_.isEmpty(needsLoadingCategories)
+
+  @allKbModelNames: ->
+    Object
+      .keys(App)
+      .filter (elem) ->
+        elem.match(/^KnowledgeBase/) && App[elem]?.prototype instanceof App.Model
+
   @configure_attributes: [
     {
       name:    'translation::title'

app/assets/javascripts/app/models/knowledge_base_answer.coffee

@@ -3,6 +3,7 @@ class App.KnowledgeBaseAnswer extends App.Model
   @extend Spine.Model.Ajax
   @extend App.KnowledgeBaseActions
   @extend App.KnowledgeBaseCanBePublished
+  @extend App.KnowledgeBaseAccess
 
   @serverClassName: 'KnowledgeBase::Answer'
 
@@ -95,4 +96,4 @@ class App.KnowledgeBaseAnswer extends App.Model
     'Answer'
 
   visibleInternally: (kb_locale) =>
-    @is_internally_published(kb_locale)
+    (@is_internally_published(kb_locale) && @access() != 'none') || @is_published(kb_locale)

app/assets/javascripts/app/models/knowledge_base_category.coffee

@@ -2,6 +2,7 @@ class App.KnowledgeBaseCategory extends App.Model
   @configure 'KnowledgeBaseCategory', 'category_icon', 'parent_id', 'child_ids', 'translation_ids'
   @extend Spine.Model.Ajax
   @extend App.KnowledgeBaseActions
+  @extend App.KnowledgeBaseAccess
 
   url: ->
     @knowledge_base().generateURL('categories')
@@ -166,6 +167,8 @@ class App.KnowledgeBaseCategory extends App.Model
       'draft'
 
   visibleInternally: (kb_locale) =>
+    #return false if @access() == 'none'
+
     @findDeepAnswer( (record) ->
       record.is_internally_published(kb_locale)
     )?

app/assets/javascripts/app/models/knowledge_base_category_permission.coffee

@@ -0,0 +1,2 @@
+class App.KnowledgeBaseCategoryPermission extends App.Model
+  @configure 'KnowledgeBaseCategoryPermission', 'access'

app/assets/javascripts/app/views/knowledge_base/base_form.coffee

@@ -65,7 +65,6 @@ class App.KnowledgeBaseForm extends App.Controller
   submit: (e) ->
     @preventDefaultAndStopPropagation(e)
 
-    #debuggerj
     formController = @formControllers.filter((elem) -> (elem.form[0] is e.currentTarget) or (e.currentTarget.contains(elem.form[0])))[0]
     params         = @formParam(formController.form)
 

app/assets/javascripts/app/views/knowledge_base/permissions_dialog.jst.eco

@@ -0,0 +1,33 @@
+<div style="padding-left: 18px; padding-top: 10px;">
+  <table class="settings-list settings-list--roles-permissions">
+    <thead>
+      <th width=150><%- @T('Role') %>
+      <% for key, text of @accessLevels: %>
+        <th><%- @T(text) %>
+      <% end %>
+    <tbody>
+  <% for role in @roles: %>
+    <tr>
+      <td>
+        <%= role.name %>
+      <% for key, text of @accessLevels: %>
+        <td class="settings-list-control-cell settings-list-radio-cell u-clickable">
+          <label class="inline-label radio-replacement">
+            <input
+              type="radio"
+              value="<%= key %>"
+              name="<%= role.id %>"
+              <% if @params[role.id] == key: %>checked<% end %>
+              <% if role.limit?: %>
+                <% if key == 'editor' && role.limit != 'editor': %>disabled<% end %>
+                <% if key == 'reader' && role.limit == 'none': %>disabled<% end %>
+              <% end %>
+              />
+            <%- @Icon('radio', 'icon-unchecked') %>
+            <%- @Icon('radio-checked', 'icon-checked') %>
+          </label>
+      <% end %>
+    </tr>
+  <% end %>
+  </table>
+</div>

app/assets/stylesheets/zammad.scss

@@ -10921,10 +10921,15 @@ output {
     }
   }
 
-  .settings-list-checkbox-cell {
+  .settings-list-checkbox-cell,
+  .settings-list-radio-cell {
     vertical-align: middle;
     padding-left: 8px;
   }
+
+  .settings-list-radio-cell {
+    text-align: center;
+  }
 }
 
 .select-boxes {

app/controllers/knowledge_base/permissions_controller.rb

@@ -0,0 +1,45 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase::PermissionsController < ApplicationController
+  prepend_before_action :authentication_check
+  before_action :fetch_object
+
+  def show
+    render json: response_hash
+  end
+
+  def update
+    permissions_params = params.require(:permissions_dialog).permit(permissions: {})
+
+    KnowledgeBase::PermissionsUpdate.new(@object, current_user).update_using_params!(permissions_params)
+
+    render json: response_hash
+  end
+
+  private
+
+  def fetch_object
+    if params[:knowledge_base_id]
+      @object = KnowledgeBase::Category.includes(:permissions).find params[:id]
+      authorize @object, :permissions?
+    else
+      @object = KnowledgeBase.includes(:permissions).find params[:id]
+      authorize @object, :update?
+    end
+  end
+
+  def parent_object
+    return if !@object.is_a? KnowledgeBase::Category
+
+    @object.parent || @object.knowledge_base
+  end
+
+  def response_hash
+    {
+      roles_reader: Role.with_permissions('knowledge_base.reader').pluck_as_hash(:id, :name),
+      roles_editor: Role.with_permissions('knowledge_base.editor').pluck_as_hash(:id, :name),
+      permissions:  @object.permissions_effective.pluck_as_hash(:id, :access, :role_id),
+      inherited:    parent_object&.permissions_effective&.pluck_as_hash(:id, :access, :role_id)
+    }
+  end
+end

app/controllers/knowledge_base/public/answers_controller.rb

@@ -13,9 +13,7 @@ class KnowledgeBase::Public::AnswersController < KnowledgeBase::Public::BaseCont
   private
 
   def render_alternative
-    @alternative = policy_scope(@knowledge_base.answers)
+    @alternative = find_answer @knowledge_base.answers.eager_load(translations: :kb_locale), params[:answer], locale: false
-                   .eager_load(translations: :kb_locale)
-                   .find_by(id: params[:answer])
 
     raise ActiveRecord::RecordNotFound if !@alternative&.translations&.any?
 

app/controllers/knowledge_base/public/base_controller.rb

@@ -2,7 +2,8 @@
 
 class KnowledgeBase::Public::BaseController < ApplicationController
   before_action :load_kb
-  helper_method :system_locale_via_uri, :fallback_locale, :current_user, :find_category, :filter_primary_kb_locale, :menu_items, :all_locales
+  helper_method :system_locale_via_uri, :fallback_locale, :current_user, :find_category,
+                :filter_primary_kb_locale, :menu_items, :all_locales, :can_preview?
 
   layout 'knowledge_base'
 
@@ -31,12 +32,9 @@ class KnowledgeBase::Public::BaseController < ApplicationController
   end
 
   def fallback_locale
-    if all_locales.find { |locale| locale.id == system_locale_via_uri&.id }
+    return system_locale_via_uri if all_locales.find { |locale| locale.id == system_locale_via_uri&.id }
-      system_locale_via_uri
-    else
-      filter_primary_kb_locale || all_locales.first
-    end
 
+    filter_primary_kb_locale || all_locales.first
   end
 
   def filter_primary_kb_locale
@@ -62,16 +60,40 @@ class KnowledgeBase::Public::BaseController < ApplicationController
     list
       .localed(system_locale_via_uri)
       .sorted
-      .select { |category| policy(category).show? }
+      .select { |category| policy(category).show_public? }
   end
 
-  def find_answer(scope, id)
+  def answers_filter(list)
+    answers = list
+                .localed(system_locale_via_uri)
+                .sorted
+
+    if current_user&.permissions?('knowledge_base.editor')
+      answers.filter { |answer| policy(answer).show_public? }
+    else
+      answers.published
+    end
+  end
+
+  def find_answer(scope, id, locale: system_locale_via_uri)
     return if scope.nil?
 
-    policy_scope(scope)
+    scope = scope.include_contents
-      .localed(system_locale_via_uri)
+    scope = scope.localed(locale) if locale
-      .include_contents
+
-      .find_by(id: id)
+    if !current_user&.permissions?('knowledge_base.editor')
+      return scope.published.find_by(id: id)
+    end
+
+    if (item = scope.find_by(id: id)) && policy(item).show_public?
+      return item
+    end
+
+    nil
+  end
+
+  def can_preview?
+    @can_preview ||= policy(@knowledge_base).update?
   end
 
   def not_found(e)

app/controllers/knowledge_base/public/categories_controller.rb

@@ -15,14 +15,11 @@ class KnowledgeBase::Public::CategoriesController < KnowledgeBase::Public::BaseC
   def show
     @object = find_category(params[:category])
 
-    render_alternatives && return if @object.nil? || !policy(@object).show?
+    render_alternatives && return if @object.nil? || !policy(@object).show_public?
 
     @categories     = categories_filter(@object.children)
     @object_locales = find_locales(@object)
-
+    @answers        = answers_filter(@object.answers)
-    @answers = policy_scope(@object.answers)
-               .localed(system_locale_via_uri)
-               .sorted
 
     render :index
   end

app/controllers/knowledge_base/public/tags_controller.rb

@@ -3,11 +3,6 @@
 class KnowledgeBase::Public::TagsController < KnowledgeBase::Public::BaseController
   def show
     @object  = [:tag, params[:tag]]
-
+    @answers = answers_filter KnowledgeBase::Answer.tag_objects(params[:tag])
-    all_tagged = KnowledgeBase::Answer.tag_objects(params[:tag])
-
-    @answers = policy_scope(all_tagged)
-               .localed(system_locale_via_uri)
-               .sorted
   end
 end

app/controllers/knowledge_bases_controller.rb

@@ -5,15 +5,41 @@ class KnowledgeBasesController < KnowledgeBase::BaseController
     render json: assets(params[:answer_translation_content_ids])
   end
 
+  def visible_ids
+    render json: KnowledgeBase::InternalAssets.new(current_user).visible_ids
+  end
+
   private
 
   def assets(answer_translation_content_ids = nil)
-    return editor_assets(answer_translation_content_ids) if current_user&.permissions?('knowledge_base.editor')
+    if KnowledgeBase.granular_permissions?
-    return reader_assets(answer_translation_content_ids) if current_user&.permissions?('knowledge_base.reader')
+      return granular_assets(answer_translation_content_ids) if kb_permissions?
+    else
+      return editor_assets(answer_translation_content_ids) if kb_permission_editor?
+      return reader_assets(answer_translation_content_ids) if kb_permission_reader?
+    end
 
     public_assets
   end
 
+  def kb_permissions?
+    current_user&.permissions?(%w[knowledge_base.editor knowledge_base.reader])
+  end
+
+  def kb_permission_editor?
+    current_user&.permissions?('knowledge_base.editor')
+  end
+
+  def kb_permission_reader?
+    current_user&.permissions?('knowledge_base.reader')
+  end
+
+  def granular_assets(answer_translation_content_ids)
+    KnowledgeBase::InternalAssets
+      .new(current_user, answer_translation_content_ids: answer_translation_content_ids)
+      .collect_assets
+  end
+
   def editor_assets(answer_translation_content_ids)
     assets = [
       KnowledgeBase,

app/helpers/knowledge_base_top_bar_helper.rb

@@ -36,7 +36,7 @@ module KnowledgeBaseTopBarHelper
   end
 
   def render_top_bar_if_needed(object, knowledge_base)
-    return if !policy(:knowledge_base).edit?
+    return if !can_preview?
 
     editable = object || knowledge_base
 

app/helpers/knowledge_base_visibility_class_helper.rb

@@ -2,7 +2,7 @@
 
 module KnowledgeBaseVisibilityClassHelper
   def visibility_class_name(object)
-    return if !policy(:knowledge_base).edit?
+    return if !can_preview?
 
     suffix = case object
              when CanBePublished

app/helpers/knowledge_base_visibility_note_helper.rb

@@ -2,7 +2,7 @@
 
 module KnowledgeBaseVisibilityNoteHelper
   def visibility_note(object)
-    return if !policy(:knowledge_base).edit?
+    return if !can_preview?
 
     text = visibility_text(object)
 

app/jobs/checks_kb_client_notification_job.rb

@@ -4,12 +4,12 @@ class ChecksKbClientNotificationJob < ApplicationJob
   include HasActiveJobLock
 
   def lock_key
-    # "ChecksKbClientNotificationJob/KnowledgeBase::Answer/42/destroy"
+    # "ChecksKbClientNotificationJob/KnowledgeBase::Answer/42"
-    "#{self.class.name}/#{arguments[0]}/#{arguments[1]}/#{arguments[2]}"
+    "#{self.class.name}/#{arguments[0]}/#{arguments[1]}"
   end
 
-  def perform(klass_name, id, event)
+  def perform(klass_name, object_id)
-    object = klass_name.constantize.find_by(id: id)
+    object = klass_name.constantize.find_by(id: object_id)
     return if object.blank?
 
     level = needs_editor?(object) ? 'editor' : '*'
@@ -24,7 +24,7 @@ class ChecksKbClientNotificationJob < ApplicationJob
 
   def build_data(object, event)
     timestamp = event == :destroy ? Time.zone.now : object.updated_at
-    url       = event == :destroy ? nil           : object.api_url
+    url       = event == :destroy ? nil           : object.try(:api_url)
 
     {
       class:     object.class.to_s,
@@ -57,8 +57,4 @@ class ChecksKbClientNotificationJob < ApplicationJob
       .filter_map { |user_id| User.find_by(id: user_id) }
       .select { |user| user.permissions? "knowledge_base.#{permission_suffix}" }
   end
-
-  def self.notify_later(object, event)
-    perform_later(object.class.to_s, object.id, event.to_s)
-  end
 end

app/jobs/checks_kb_client_visibility_job.rb

@@ -0,0 +1,14 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class ChecksKbClientVisibilityJob < ApplicationJob
+  include HasActiveJobLock
+
+  def lock_key
+    # "ChecksKbClientVisibilityJob"
+    self.class.name
+  end
+
+  def perform
+    Sessions.broadcast({ event: 'kb_visibility_may_have_changed' })
+  end
+end

app/models/concerns/checks_kb_client_notification.rb

@@ -4,10 +4,7 @@ module ChecksKbClientNotification
   extend ActiveSupport::Concern
 
   included do
-    after_create  :notify_kb_clients_after_create
+    after_commit :notify_kb_clients_after
-    after_update  :notify_kb_clients_after_update
-    after_touch   :notify_kb_clients_after_touch
-    after_destroy :notify_kb_clients_after_destroy
 
     class_attribute :notify_kb_clients_suspend, default: false
   end
@@ -30,25 +27,9 @@ module ChecksKbClientNotification
 
   # generic call
 
-  def notify_kb_clients(event)
+  def notify_kb_clients_after
     return if self.class.notify_kb_clients_suspend?
 
-    ChecksKbClientNotificationJob.notify_later(self, event)
+    ChecksKbClientNotificationJob.perform_later(self.class.name, id)
-  end
-
-  def notify_kb_clients_after_create
-    notify_kb_clients(:create)
-  end
-
-  def notify_kb_clients_after_update
-    notify_kb_clients(:update)
-  end
-
-  def notify_kb_clients_after_touch
-    notify_kb_clients(:touch)
-  end
-
-  def notify_kb_clients_after_destroy
-    notify_kb_clients(:destroy)
   end
 end

app/models/concerns/checks_kb_client_visibility.rb

@@ -0,0 +1,17 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+module ChecksKbClientVisibility
+  extend ActiveSupport::Concern
+
+  included do
+    after_commit :notify_kb_client_visibility
+  end
+
+  private
+
+  def notify_kb_client_visibility
+    return if self.class.notify_kb_clients_suspend?
+
+    ChecksKbClientVisibilityJob.perform_later
+  end
+end

app/models/knowledge_base.rb

@@ -24,6 +24,11 @@ class KnowledgeBase < ApplicationModel
 
   has_many :answers, through: :categories
 
+  has_many :permissions, class_name: 'KnowledgeBase::Permission',
+                         as:         :permissionable,
+                         autosave:   true,
+                         dependent:  :destroy
+
   validates :category_layout, inclusion: { in: KnowledgeBase::LAYOUTS }
   validates :homepage_layout, inclusion: { in: KnowledgeBase::LAYOUTS }
 
@@ -156,6 +161,24 @@ class KnowledgeBase < ApplicationModel
       .any? { |e| e > 1 }
   end
 
+  def permissions_effective
+    cache_key = KnowledgeBase::Permission.cache_key self
+
+    Rails.cache.fetch cache_key do
+      permissions
+    end
+  end
+
+  def attributes_with_association_ids
+    attrs = super
+    attrs[:permissions_effective] = permissions_effective
+    attrs
+  end
+
+  def self.granular_permissions?
+    KnowledgeBase::Permission.any?
+  end
+
   private
 
   def set_defaults

app/models/knowledge_base/answer.rb

@@ -6,6 +6,7 @@ class KnowledgeBase::Answer < ApplicationModel
   include HasTags
   include CanBePublished
   include ChecksKbClientNotification
+  include ChecksKbClientVisibility
   include CanCloneAttachments
 
   AGENT_ALLOWED_ATTRIBUTES       = %i[category_id promoted internal_note].freeze
@@ -49,7 +50,13 @@ class KnowledgeBase::Answer < ApplicationModel
     siblings = category.answers
 
     if !User.lookup(id: UserInfo.current_user_id)&.permissions?('knowledge_base.editor')
-      siblings = siblings.internal
+      ep = KnowledgeBase::EffectivePermission.new User.find(UserInfo.current_user_id), category
+
+      siblings = if ep.access_effective == 'public_reader'
+                   siblings.published
+                 else
+                   siblings.internal
+                 end
     end
 
     data = ApplicationModel::CanAssets.reduce(siblings, data)

app/models/knowledge_base/category.rb

@@ -4,6 +4,7 @@ class KnowledgeBase::Category < ApplicationModel
   include HasTranslations
   include HasAgentAllowedParams
   include ChecksKbClientNotification
+  include ChecksKbClientVisibility
 
   AGENT_ALLOWED_ATTRIBUTES       = %i[knowledge_base_id parent_id category_icon].freeze
   AGENT_ALLOWED_NESTED_RELATIONS = %i[translations].freeze
@@ -24,6 +25,11 @@ class KnowledgeBase::Category < ApplicationModel
                          touch:      true,
                          optional:   true
 
+  has_many :permissions, class_name: 'KnowledgeBase::Permission',
+                         as:         :permissionable,
+                         autosave:   true,
+                         dependent:  :destroy
+
   validates :category_icon, presence: true
 
   scope :root,   -> { where(parent: nil) }
@@ -119,6 +125,20 @@ class KnowledgeBase::Category < ApplicationModel
     Rails.application.routes.url_helpers.knowledge_base_category_path(knowledge_base, self)
   end
 
+  def permissions_effective
+    cache_key = KnowledgeBase::Permission.cache_key self
+
+    Rails.cache.fetch cache_key do
+      KnowledgeBase::Category::Permission.new(self).permissions_effective
+    end
+  end
+
+  def attributes_with_association_ids
+    attrs = super
+    attrs[:permissions_effective] = permissions_effective
+    attrs
+  end
+
   private
 
   def cannot_be_child_of_parent

app/models/knowledge_base/permission.rb

@@ -0,0 +1,16 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase::Permission < ApplicationModel
+  belongs_to :permissionable, polymorphic: true, touch: true
+  belongs_to :role
+
+  validates :access, inclusion: { in: %w[editor reader none] }
+  validates :role, uniqueness: { scope: %i[permissionable_id permissionable_type] }
+
+  # cache key for calculated permissions
+  # @param permissionable [KnowledgeBase::Category, KnowledgeBase]
+  # @return [String]
+  def self.cache_key(permissionable)
+    "#{permissionable.class}::aws::#{permissionable.id}::permission::#{permissionable.updated_at}"
+  end
+end

app/models/role.rb

@@ -14,11 +14,12 @@ class Role < ApplicationModel
   has_and_belongs_to_many :users, after_add: :cache_update, after_remove: :cache_update
   has_and_belongs_to_many :permissions,
                           before_add:    %i[validate_agent_limit_by_permission validate_permissions],
-                          after_add:     :cache_update,
+                          after_add:     %i[cache_update cache_add_kb_permission],
                           before_remove: :last_admin_check_by_permission,
-                          after_remove:  :cache_update
+                          after_remove:  %i[cache_update cache_remove_kb_permission]
   validates               :name, presence: true
   store                   :preferences
+  has_many                :knowledge_base_permissions, class_name: 'KnowledgeBase::Permission', dependent: :destroy
 
   before_create  :check_default_at_signup_permissions
   before_update  :last_admin_check_by_attribute, :validate_agent_limit_by_attributes, :check_default_at_signup_permissions
@@ -232,4 +233,31 @@ returns
     raise Exceptions::UnprocessableEntity, "Cannot set default at signup when role has #{forbidden_permissions.join(', ')} permissions."
   end
 
+  def cache_add_kb_permission(permission)
+    return if !permission.name.starts_with? 'knowledge_base.'
+    return if !KnowledgeBase.granular_permissions?
+
+    KnowledgeBase::Category.all.each(&:touch)
+  end
+
+  def cache_remove_kb_permission(permission)
+    return if !permission.name.starts_with? 'knowledge_base.'
+    return if !KnowledgeBase.granular_permissions?
+
+    has_editor = permissions.where(name: 'knowledge_base.editor').any?
+    has_reader = permissions.where(name: 'knowledge_base.reader').any?
+
+    KnowledgeBase::Permission
+      .where(role: self)
+      .each do |elem|
+        if !has_editor && !has_reader
+          elem.destroy!
+        elsif !has_editor && has_reader
+          elem.update!(access: 'reader') if permission.access == 'editor'
+        end
+
+      end
+
+    KnowledgeBase::Category.all.each(&:touch)
+  end
 end

app/policies/controllers/knowledge_base/answers_controller_policy.rb

@@ -2,9 +2,34 @@
 
 class Controllers::KnowledgeBase::AnswersControllerPolicy < Controllers::KnowledgeBase::BaseControllerPolicy
   def show?
-    return true if user.permissions?('knowledge_base.editor')
+    access(__method__)
+  end
 
-    object = record.klass.find(record.params[:id])
+  def create?
-    object.can_be_published_aasm.internal? || object.can_be_published_aasm.published?
+    verify_category(__method__)
+  end
+
+  def update?
+    access(__method__) && verify_category(__method__)
+  end
+
+  def destroy?
+    access(__method__)
+  end
+
+  private
+
+  def object
+    @object ||= record.klass.find(record.params[:id])
+  end
+
+  def access(method)
+    KnowledgeBase::AnswerPolicy.new(user, object).send(method)
+  end
+
+  def verify_category(method)
+    new_category = KnowledgeBase::Category.find(record.params[:category_id])
+
+    KnowledgeBase::CategoryPolicy.new(user, new_category).send(method)
   end
 end

app/policies/controllers/knowledge_base/categories_controller_policy.rb

@@ -2,8 +2,38 @@
 
 class Controllers::KnowledgeBase::CategoriesControllerPolicy < Controllers::KnowledgeBase::BaseControllerPolicy
   def show?
-    return if user.permissions?('knowledge_base.editor')
+    access(__method__)
+  end
 
-    record.klass.find(record.params[:id]).internal_content?
+  def create?
+    verify_parent(__method__)
+  end
+
+  def update?
+    access(__method__) && verify_parent(__method__)
+  end
+
+  def destroy?
+    access(__method__)
+  end
+
+  private
+
+  def object
+    @object ||= record.klass.find(record.params[:id])
+  end
+
+  def access(method)
+    KnowledgeBase::CategoryPolicy.new(user, object).send(method)
+  end
+
+  def verify_parent(method)
+    if record.params[:parent_id].blank?
+      return user.permissions?('knowledge_base.editor')
+    end
+
+    parent = KnowledgeBase::Category.find(record.params[:parent_id])
+
+    KnowledgeBase::CategoryPolicy.new(user, parent).send(method)
   end
 end

app/policies/controllers/knowledge_bases_controller_policy.rb

@@ -12,4 +12,18 @@ class Controllers::KnowledgeBasesControllerPolicy < Controllers::KnowledgeBase::
   def destroy?
     false
   end
+
+  def update?
+    access(__method__)
+  end
+
+  private
+
+  def object
+    @object ||= record.klass.find(record.params[:id])
+  end
+
+  def access(method)
+    KnowledgeBase::CategoryPolicy.new(user, object).send(method)
+  end
 end

app/policies/knowledge_base/answer_policy.rb

@@ -2,13 +2,39 @@
 
 class KnowledgeBase::AnswerPolicy < ApplicationPolicy
   def show?
-    return true if user&.permissions?(%w[knowledge_base.editor])
+    return true if access_editor?
 
     record.visible? ||
-      (user&.permissions?(%w[knowledge_base.reader]) && record.visible_internally?)
+      (access_reader? && record.visible_internally?)
+  end
+
+  def show_public?
+    access_editor? || record.visible?
+  end
+
+  def create?
+    access_editor?
+  end
+
+  def update?
+    access_editor?
   end
 
   def destroy?
-    user&.permissions?(%w[knowledge_base.editor])
+    access_editor?
+  end
+
+  private
+
+  def access
+    @access ||= KnowledgeBase::EffectivePermission.new(user, record.category).access_effective
+  end
+
+  def access_editor?
+    access == 'editor'
+  end
+
+  def access_reader?
+    access == 'reader'
   end
 end

app/policies/knowledge_base/category_policy.rb

@@ -2,13 +2,51 @@
 
 class KnowledgeBase::CategoryPolicy < ApplicationPolicy
   def show?
-    return true if user&.permissions?('knowledge_base.editor')
+    access_editor? || access_reader?
+  end
 
-    record.public_content?
+  def show_public?
+    access_editor? || record.public_content?
+  end
+
+  def permissions?
+    access_editor?
+  end
+
+  def create?
+    parent_editor?
+  end
+
+  def update?
+    access_editor?
+  end
+
+  def destroy?
+    parent_editor?
   end
 
   private
 
+  def access
+    @access ||= KnowledgeBase::EffectivePermission.new(user, record).access_effective
+  end
+
+  def access_editor?
+    access == 'editor'
+  end
+
+  def access_reader?
+    access == 'reader'
+  end
+
+  def parent_access
+    @parent_access ||= KnowledgeBase::EffectivePermission.new(user, (record.parent || record.knowledge_base)).access_effective
+  end
+
+  def parent_editor?
+    parent_access == 'editor'
+  end
+
   def user_required?
     false
   end

app/policies/knowledge_base_policy.rb

@@ -1,7 +1,25 @@
 # Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
 
 class KnowledgeBasePolicy < ApplicationPolicy
-  def edit?
+  def show?
-    user&.permissions?('knowledge_base.editor')
+    access_editor? || access_reader?
+  end
+
+  def update?
+    access_editor?
+  end
+
+  private
+
+  def access
+    @access ||= KnowledgeBase::EffectivePermission.new(user, record).access_effective
+  end
+
+  def access_editor?
+    access == 'editor'
+  end
+
+  def access_reader?
+    access == 'reader'
   end
 end

config/routes/knowledge_base.rb

@@ -20,6 +20,7 @@ Zammad::Application.routes.draw do
     resources :knowledge_bases, only: %i[show update] do
       collection do
         post :init
+        get  :visible_ids
         post :search,         controller: 'knowledge_base/search'
         get  :recent_answers, controller: 'knowledge_base/answers'
 
@@ -35,11 +36,17 @@ Zammad::Application.routes.draw do
         end
       end
 
+      member do
+        resource :permissions, controller: 'knowledge_base/permissions', only: %i[update show]
+      end
+
       resources :categories, controller: 'knowledge_base/categories',
                              except:     %i[new edit] do
 
         member do
           patch :reorder_categories, :reorder_answers
+
+          resource :permissions, controller: 'knowledge_base/permissions', only: %i[update show]
         end
 
         collection do

db/migrate/20190531180304_initialize_knowledge_base.rb

@@ -108,6 +108,18 @@ class InitializeKnowledgeBase < ActiveRecord::Migration[5.0]
       t.timestamps # rubocop:disable Zammad/ExistsDateTimePrecision
     end
 
+    create_table :knowledge_base_permissions do |t|
+      t.references :permissionable, polymorphic: true, null: false, index: { name: 'index_knowledge_base_permissions_on_permissionable' }
+      t.references :role, null: false, foreign_key: { to_table: :roles }
+
+      t.string 'access', limit: 50, default: 'full', null: false
+      t.index 'access'
+
+      t.index %i[role_id permissionable_id permissionable_type], unique: true, name: 'knowledge_base_permissions_uniqueness'
+
+      t.timestamps limit: 3
+    end
+
     Setting.create_if_not_exists(
       title:       'Kb multi-lingual support',
       name:        'kb_multi_lingual_support',
@@ -173,7 +185,8 @@ class InitializeKnowledgeBase < ActiveRecord::Migration[5.0]
       note:         'Access %s',
       preferences:  {
         translations: ['Knowledge Base']
-      }
+      },
+      allow_signup: true,
     )
 
     Permission.create_if_not_exists(

db/migrate/20210918163819_create_knowledge_base_permissions.rb

@@ -0,0 +1,22 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+# Using older 5.0 migration to stick to Integer primary keys. Otherwise migration fails in MySQL.
+class CreateKnowledgeBasePermissions < ActiveRecord::Migration[5.0]
+  def change
+    return if !Setting.exists?(name: 'system_init_done')
+
+    create_table :knowledge_base_permissions do |t|
+      t.references :permissionable, polymorphic: true, null: false, index: { name: 'index_knowledge_base_permissions_on_permissionable' }
+      t.references :role, null: false, foreign_key: { to_table: :roles }
+
+      t.string 'access', limit: 50, default: 'full', null: false
+      t.index 'access'
+
+      t.index %i[role_id permissionable_id permissionable_type], unique: true, name: 'knowledge_base_permissions_uniqueness'
+
+      t.timestamps limit: 3
+    end
+
+    Permission.where(name: 'knowledge_base.reader').update_all(allow_signup: true) # rubocop:disable Rails/SkipsModelValidations
+  end
+end

db/seeds/permissions.rb

@@ -445,7 +445,8 @@ Permission.create_if_not_exists(
   note:         __('Manage %s'),
   preferences:  {
     translations: [__('Knowledge Base Reader')]
-  }
+  },
+  allow_signup: true,
 )
 
 admin = Role.find_by(name: 'Admin')

i18n/zammad.pot

@@ -5163,6 +5163,10 @@ msgstr ""
 msgid "Invalid payload, need data:image in logo param"
 msgstr ""
 
+#: lib/knowledge_base/permissions_update.rb
+msgid "Invalid permissions, do not lock out yourself"
+msgstr ""
+
 #: app/models/concerns/checks_condition_validation.rb
 msgid "Invalid ticket selector conditions"
 msgstr ""
@@ -7613,6 +7617,7 @@ msgstr ""
 #: app/assets/javascripts/app/controllers/_ui_element/core_workflow_condition.coffee
 #: app/assets/javascripts/app/controllers/role.coffee
 #: app/assets/javascripts/app/views/integration/ldap.jst.eco
+#: app/assets/javascripts/app/views/knowledge_base/permissions_dialog.jst.eco
 msgid "Role"
 msgstr ""
 
@@ -9570,6 +9575,14 @@ msgstr ""
 msgid "URL (AJAX endpoint)"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/knowledge_base/permissions_dialog.coffee
+msgid "Unable to load changes"
+msgstr ""
+
+#: app/assets/javascripts/app/controllers/knowledge_base/permissions_dialog.coffee
+msgid "Unable to save changes"
+msgstr ""
+
 #: app/controllers/first_steps_controller.rb
 #: db/seeds/overviews.rb
 msgid "Unassigned & Open Tickets"
@@ -10024,11 +10037,11 @@ msgid "Visibility"
 msgstr ""
 
 #: app/assets/javascripts/app/controllers/knowledge_base/content_can_be_published_form.coffee
-msgid "Visible to agents & editors"
+msgid "Visible to everyone"
 msgstr ""
 
 #: app/assets/javascripts/app/controllers/knowledge_base/content_can_be_published_form.coffee
-msgid "Visible to everyone"
+msgid "Visible to readers & editors"
 msgstr ""
 
 #: app/assets/javascripts/app/controllers/_integration/placetel.coffee

lib/core_ext/active_record/calculations/pluck_as_hash.rb

@@ -37,3 +37,24 @@ module ActiveRecord
     end
   end
 end
+
+module Enumerable
+  def pluck_as_hash(*column_names)
+    column_names.flatten! # flatten args in case array was given
+
+    pluck(*column_names)
+      .map { |elem| pluck_as_hash_map(column_names, elem) }
+  end
+
+  private
+
+  def pluck_as_hash_map(keys, values)
+    if keys.one?
+      {
+        keys.first => values
+      }
+    else
+      keys.zip(values).to_h
+    end
+  end
+end

lib/knowledge_base/category/permission.rb

@@ -0,0 +1,33 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase
+  class Category
+    class Permission
+      def initialize(category)
+        @category = category
+      end
+
+      def permissions_effective
+        parents_for_category
+          .map(&:permissions)
+          .flatten
+          .each_with_object([]) do |elem, memo|
+            memo << elem if !memo.find { |added| added.role == elem.role }
+          end
+      end
+
+      private
+
+      def parents_for_category
+        categories_tree = @category.self_with_parents
+
+        categories_with_permissions = KnowledgeBase::Category.where(id: categories_tree).includes(:permissions).to_a
+
+        sorted_with_permissions = categories_tree
+          .map { |elem| categories_with_permissions.find { |elem_with_permissions| elem_with_permissions == elem } }
+
+        sorted_with_permissions + [@category.knowledge_base]
+      end
+    end
+  end
+end

lib/knowledge_base/effective_permission.rb

@@ -0,0 +1,58 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase
+  class EffectivePermission
+    def initialize(user, object)
+      @user   = user
+      @object = object
+    end
+
+    def access_effective
+      return 'none' if !@user
+
+      @user.roles.reduce('none') do |memo, role|
+        access = access_role_effective(role)
+
+        return access if access == 'editor'
+
+        memo == 'reader' ? memo : access
+      end
+    end
+
+    private
+
+    def permissions
+      @permissions ||= @object.permissions_effective
+    end
+
+    def access_role_effective(role)
+      permission = permissions.find { |elem| elem.role == role }
+
+      return default_role_access(role) if !permission
+
+      calculate_role(role, permission)
+    end
+
+    def calculate_role(role, permission)
+      if permission.access == 'editor' && role.with_permission?('knowledge_base.editor')
+        'editor'
+      elsif %w[editor reader].include?(permission.access) && role.with_permission?(%w[knowledge_base.editor knowledge_base.reader])
+        'reader'
+      elsif @object.public_content?
+        'public_reader'
+      else
+        'none'
+      end
+    end
+
+    def default_role_access(role)
+      if role.with_permission?('knowledge_base.editor')
+        'editor'
+      elsif role.with_permission?('knowledge_base.reader')
+        'reader'
+      else
+        'none'
+      end
+    end
+  end
+end

lib/knowledge_base/internal_assets.rb

@@ -0,0 +1,120 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase
+  class InternalAssets
+    CategoriesCache = Struct.new(:editor, :reader, :public_reader, keyword_init: true) do
+      def all
+        editor + reader + public_reader
+      end
+    end
+
+    attr_reader :assets
+
+    def initialize(user, answer_translation_content_ids: [])
+      @user = user
+      @assets = {}
+      @answer_translation_content_ids = answer_translation_content_ids
+    end
+
+    def collect_assets
+      collect_base_assets
+
+      add_to_assets accessible_categories.all, type: :essential
+      add_to_assets KnowledgeBase::Category::Translation.where(category: accessible_categories.all)
+
+      collect_all_answer_assets
+
+      @assets
+    end
+
+    def accessible_categories
+      @accessible_categories ||= accessible_categories_calculate
+    end
+
+    def all_answer_ids
+      all_answer_batches.each_with_object([]) do |elem, sum|
+        sum.concat elem.pluck(:id)
+      end
+    end
+
+    def all_category_ids
+      accessible_categories.all.pluck(:id)
+    end
+
+    def visible_ids
+      {
+        answer_ids:   all_answer_ids,
+        category_ids: all_category_ids
+      }
+    end
+
+    private
+
+    def accessible_categories_calculate
+      struct = CategoriesCache.new editor: [], reader: [], public_reader: []
+
+      KnowledgeBase::Category.all.find_in_batches do |group|
+        group.each do |cat|
+          case KnowledgeBase::EffectivePermission.new(@user, cat).access_effective
+          when 'editor'
+            struct.editor << cat
+          when 'reader'
+            struct.reader << cat if cat.internal_content?
+          when 'public_reader'
+            struct.public_reader << cat if cat.public_content?
+          end
+        end
+      end
+
+      struct
+    end
+
+    def add_to_assets(objects, type: nil)
+      @assets = ApplicationModel::CanAssets.reduce(objects, @assets, type)
+    end
+
+    def collect_base_assets
+      [KnowledgeBase, KnowledgeBase::Translation, KnowledgeBase::Locale]
+        .each do |klass|
+          klass.find_in_batches do |group|
+            add_to_assets group, type: :essential
+          end
+        end
+    end
+
+    def all_answer_batches
+      [
+        KnowledgeBase::Answer.where(category: accessible_categories.editor),
+        KnowledgeBase::Answer.internal.where(category: accessible_categories.reader),
+        KnowledgeBase::Answer.published.where(category: accessible_categories.public_reader)
+      ]
+    end
+
+    def collect_all_answer_assets
+      all_answer_batches.each do |batch|
+        collect_answers_assets batch
+      end
+    end
+
+    def collect_answers_assets(scope)
+      scope.find_in_batches do |group|
+        add_to_assets group, type: :essential
+
+        translations = KnowledgeBase::Answer::Translation.where(answer: group)
+
+        add_to_assets translations, type: :essential
+
+        if @answer_translation_content_ids.present?
+          contents = KnowledgeBase::Answer::Translation::Content
+            .joins(:translation)
+            .where(
+              id:                                 @answer_translation_content_ids,
+              knowledge_base_answer_translations: { answer_id: group }
+            )
+
+          add_to_assets contents
+        end
+      end
+    end
+  end
+end

lib/knowledge_base/permissions_update.rb

@@ -0,0 +1,97 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class KnowledgeBase
+  class PermissionsUpdate
+    def initialize(object, user = nil)
+      @object = object
+      @user   = user
+    end
+
+    def update!(**roles_to_permissions)
+      ActiveRecord::Base.transaction do
+        update_object(roles_to_permissions)
+
+        next if !@object.changed_for_autosave?
+
+        @object.save!
+
+        update_all_children
+        ensure_editable!
+      end
+    end
+
+    def update_using_params!(params)
+      roles_to_permissions = params[:permissions].transform_keys { |key| Role.find key }
+
+      update!(**roles_to_permissions)
+    end
+
+    private
+
+    def update_object(roles_to_permissions)
+      @object.permissions.reject { |elem| roles_to_permissions.key? elem.role }.each(&:mark_for_destruction)
+
+      roles_to_permissions.each do |role, access|
+        update_object_permission(role, access)
+      end
+    end
+
+    def update_object_permission(role, access)
+      permission = @object.permissions.detect { |elem| elem.role == role } || @object.permissions.build(role: role)
+      permission.access = access
+
+      mark_permission_for_cleanup_if_needed(permission, parent_object_permissions)
+    end
+
+    def parent_object_permissions
+      @parent_object_permissions ||= begin
+        if @object.is_a? KnowledgeBase::Category
+          (@object.parent || @object.knowledge_base).permissions_effective || []
+        else
+          []
+        end
+      end
+    end
+
+    def all_children
+      case @object
+      when KnowledgeBase::Category
+        @object.self_with_children - [@object]
+      when KnowledgeBase
+        @object.categories.root.map(&:self_with_children).flatten
+      end
+    end
+
+    def update_single_child(child)
+      inherited_permissions = child.permissions_effective
+
+      child.permissions.each do |child_permission|
+        mark_permission_for_cleanup_if_needed(child_permission, inherited_permissions)
+      end
+
+      child.changed_for_autosave? ? child.save! : child.touch # rubocop:disable Rails/SkipsModelValidations
+    end
+
+    def update_all_children
+      all_children.each do |child|
+        update_single_child(child)
+      end
+    end
+
+    def ensure_editable!
+      return if !@user
+      return if KnowledgeBase::EffectivePermission.new(@user, @object).access_effective == 'editor'
+
+      raise Exceptions::UnprocessableEntity, __('Invalid permissions, do not lock out yourself')
+    end
+
+    def mark_permission_for_cleanup_if_needed(permission, parents)
+      matching = parents.find { |elem| elem.role == permission.role }
+
+      return if !matching
+      return if matching.access != permission.access && matching.access != 'none'
+
+      permission.mark_for_destruction
+    end
+  end
+end

spec/factories/knowledge_base_permissions.rb

@@ -0,0 +1,9 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+FactoryBot.define do
+  factory 'knowledge_base/permission', aliases: %i[knowledge_base_permission] do
+    permissionable { create(:knowledge_base_category) }
+    role           { create(:role) }
+    access         { 'editor' }
+  end
+end

spec/factories/role.rb

@@ -6,6 +6,12 @@ FactoryBot.define do
     created_by_id   { 1 }
     updated_by_id   { 1 }
 
+    transient do
+      permission_names { nil }
+    end
+
+    permissions { Permission.where(name: permission_names) }
+
     factory :agent_role do
       permissions { Permission.where(name: 'ticket.agent') }
     end

spec/lib/knowledge_base/category/permission_spec.rb

@@ -0,0 +1,73 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe KnowledgeBase::Category::Permission do
+  include_context 'basic Knowledge Base'
+
+  describe '#permissions_effective' do
+    let(:child_category)    { create(:knowledge_base_category, knowledge_base: knowledge_base, parent: category) }
+    let(:child_permission)  { create(:knowledge_base_permission, permissionable: child_category, access: 'reader') }
+    let(:parent_permission) { create(:knowledge_base_permission, permissionable: category) }
+
+    context 'when no permissions exist' do
+      it 'parent category returns nil' do
+        expect(described_class.new(category).permissions_effective).to be_blank
+      end
+
+      it 'child category returns nil' do
+        expect(described_class.new(child_category).permissions_effective).to be_blank
+      end
+    end
+
+    context 'when parent category has permissions' do
+      before { parent_permission && child_category }
+
+      it 'parent category returns parent permission' do
+        expect(described_class.new(category).permissions_effective).to eq [parent_permission]
+      end
+
+      it 'child category returns parent permission' do
+        expect(described_class.new(child_category).permissions_effective).to eq [parent_permission]
+      end
+    end
+
+    context 'when child category has permissions' do
+      before { child_permission }
+
+      it 'parent category returns parent permission' do
+        expect(described_class.new(category).permissions_effective).to be_blank
+      end
+
+      it 'child category returns parent permission' do
+        expect(described_class.new(child_category).permissions_effective).to eq [child_permission]
+      end
+    end
+
+    context 'when both parent and child categories have permissions' do
+      before { child_permission && parent_permission }
+
+      it 'parent category returns parent permission' do
+        expect(described_class.new(category).permissions_effective).to eq [parent_permission]
+      end
+
+      it 'child category returns parent permission' do
+        expect(described_class.new(child_category).permissions_effective).to eq [child_permission, parent_permission]
+      end
+    end
+
+    context 'when both parent child categories have colliding permissions for the same role' do
+      let(:child_permission_on_same_role) { create(:knowledge_base_permission, permissionable: child_category, access: 'reader', role: parent_permission.role) }
+
+      before { parent_permission && child_permission && child_permission_on_same_role }
+
+      it 'parent category returns parent permission' do
+        expect(described_class.new(category).permissions_effective).to eq [parent_permission]
+      end
+
+      it 'child category returns child permission override' do
+        expect(described_class.new(child_category).permissions_effective).to eq [child_permission, child_permission_on_same_role]
+      end
+    end
+  end
+end

spec/lib/knowledge_base/effective_permission_spec.rb

@@ -0,0 +1,91 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe KnowledgeBase::EffectivePermission do
+  include_context 'basic Knowledge Base'
+
+  describe '#access_effective' do
+    let(:role_editor) { create(:role, permission_names: 'knowledge_base.editor') }
+    let(:role_reader) { create(:role, permission_names: 'knowledge_base.reader') }
+    let(:role_non_kb) { create(:role, :admin) }
+
+    let(:user) { create(:user, roles: [role_editor, role_reader, role_non_kb]) }
+    let(:user_editor) { create(:user, roles: [role_editor]) }
+    let(:user_admin) { create(:admin) }
+    let(:user_reader) { create(:user, roles: [role_reader]) }
+    let(:user_nonkb) { create(:user, roles: [role_non_kb]) }
+
+    let(:child_category) { create(:knowledge_base_category, parent: category) }
+
+    it 'editor with no permissions defined returns editor' do
+      expect(described_class.new(user_editor, category).access_effective).to eq 'editor'
+    end
+
+    it 'user with multiple permissions defined returns editor' do
+      expect(described_class.new(user, category).access_effective).to eq 'editor'
+    end
+
+    it 'reader with no permissions defined returns reader' do
+      expect(described_class.new(user_reader, category).access_effective).to eq 'reader'
+    end
+
+    it 'non-kb with no permissions defined returns none' do
+      expect(described_class.new(user_nonkb, category).access_effective).to eq 'none'
+    end
+
+    it 'editor with both reader and editor permissions returns editor' do
+      create_permission(role_reader, 'reader')
+      create_permission(role_editor, 'editor')
+
+      expect(described_class.new(user_admin, category).access_effective).to eq 'editor'
+    end
+
+    it 'editor with reader permission on parent category returns reader' do
+      create_permission(role_editor, 'reader')
+
+      expect(described_class.new(user_editor, child_category).access_effective).to eq 'reader'
+    end
+
+    it 'editor with reader permission on KB returns reader' do
+      create_permission(role_editor, 'reader', permissionable: knowledge_base)
+
+      expect(described_class.new(user_editor, category).access_effective).to eq 'reader'
+    end
+
+    it 'editor with reader permission on parent category but editor permission on category returns editor' do
+      create_permission(role_editor, 'reader', permissionable: category)
+      create_permission(role_editor, 'editor', permissionable: child_category)
+
+      expect(described_class.new(user_editor, child_category).access_effective).to eq 'editor'
+    end
+
+    it 'editor with editor permission on parent category but reader permission on category returns reader' do
+      create_permission(role_editor, 'editor', permissionable: category)
+      create_permission(role_editor, 'reader', permissionable: child_category)
+
+      expect(described_class.new(user_editor, child_category).access_effective).to eq 'reader'
+    end
+
+    it 'reader with reader and non-effective permissions returns reader' do
+      create_permission(role_reader, 'reader')
+      create_permission(role_editor, 'editor')
+
+      expect(described_class.new(user_reader, category).access_effective).to eq 'reader'
+    end
+
+    it 'reader with no matching permissions returns reader' do
+      create_permission(role_editor, 'editor')
+
+      expect(described_class.new(user_reader, category).access_effective).to eq 'reader'
+    end
+
+    it 'retuns none when user not given' do
+      expect(described_class.new(nil, category).access_effective).to eq 'none'
+    end
+  end
+
+  def create_permission(role, access, permissionable: category)
+    create(:knowledge_base_permission, role: role, permissionable: permissionable, access: access)
+  end
+end

spec/lib/knowledge_base/internal_assets_spec.rb

@@ -0,0 +1,87 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe KnowledgeBase::InternalAssets do
+  include_context 'basic Knowledge Base' do
+    before do
+      draft_answer
+      internal_answer
+      published_answer
+    end
+  end
+
+  describe '#collect_assets' do
+    subject(:assets) { described_class.new(user).collect_assets }
+
+    context 'when for KB editor' do
+      let(:user) { create(:user, roles: Role.where(name: 'Admin')) }
+
+      it 'returns assets for all KB objects' do
+        expect(assets).to include_assets_of(knowledge_base, category, draft_answer, internal_answer, published_answer)
+      end
+
+      context 'when has editor permission' do
+        before do
+          KnowledgeBase::PermissionsUpdate.new(category).update! user.roles.first => 'editor'
+        end
+
+        it 'returns assets for all KB objects' do
+          expect(assets).to include_assets_of(knowledge_base, category, draft_answer, internal_answer, published_answer)
+        end
+      end
+
+      context 'when has reader permission' do
+        before do
+          KnowledgeBase::PermissionsUpdate.new(category).update! user.roles.first => 'reader'
+        end
+
+        it 'returns assets for internally visible KB objects' do
+          expect(assets)
+            .to include_assets_of(knowledge_base, category, internal_answer, published_answer)
+            .and not_include_assets_of(draft_answer)
+        end
+      end
+
+      context 'when has none permission' do
+        before do
+          KnowledgeBase::PermissionsUpdate.new(category).update! user.roles.first => 'none'
+        end
+
+        it 'does not return assets for internally visible KB objects' do
+          published_answer.destroy # make sure public item does not make category visible
+
+          expect(assets)
+            .to  include_assets_of(knowledge_base)
+            .and not_include_assets_of(category, draft_answer, internal_answer, published_answer)
+        end
+
+        it 'returns assets for published answer and it\'s category' do
+          expect(assets)
+            .to  include_assets_of(knowledge_base, category, published_answer)
+            .and not_include_assets_of(draft_answer, internal_answer)
+        end
+      end
+    end
+
+    context 'when for agent' do
+      let(:user) { create(:agent) }
+
+      it 'returns assets for all KB objects' do
+        expect(assets)
+          .to include_assets_of(knowledge_base, category, internal_answer, published_answer)
+          .and not_include_assets_of(draft_answer)
+      end
+    end
+
+    context 'when for customer' do
+      let(:user) { create(:customer) }
+
+      it 'returns assets for all KB objects' do
+        expect(assets)
+          .to  include_assets_of(knowledge_base)
+          .and not_include_assets_of(category, draft_answer, internal_answer, published_answer)
+      end
+    end
+  end
+end

spec/lib/knowledge_base/permissions_update_spec.rb

@@ -0,0 +1,180 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe KnowledgeBase::PermissionsUpdate do
+  describe '#update!' do
+    include_context 'basic Knowledge Base'
+    let(:role_editor) { create(:role, permission_names: %w[knowledge_base.editor]) }
+    let(:role_another) { create(:role, permission_names: %w[knowledge_base.editor]) }
+    let(:child_category) { create(:knowledge_base_category, parent: category) }
+
+    describe 'updating itself' do
+      shared_examples 'updating itself' do |object_name:|
+        let(:object) { send(object_name) }
+        it 'adds role permission for self' do
+          described_class.new(object).update! role_editor => 'editor'
+
+          expect(object.permissions)
+            .to contain_exactly have_attributes(permissionable: object, role: role_editor, access: 'editor')
+        end
+
+        it 'adds additional role permission for self' do
+          described_class.new(object).update! role_editor => 'reader'
+          described_class.new(object).update! role_editor => 'reader', role_another => 'reader'
+
+          expect(object.permissions)
+            .to contain_exactly(have_attributes(role: role_editor), have_attributes(role: role_another))
+        end
+
+        it 'does not update when re-adding an existing permission' do
+          described_class.new(object).update! role_editor => 'reader'
+
+          travel 1.minute
+
+          expect { described_class.new(object).update! role_editor => 'reader' }
+            .not_to change(object, :updated_at)
+        end
+      end
+
+      context 'when saving role on KB itself' do
+        include_context 'updating itself', object_name: :knowledge_base
+      end
+
+      context 'when saving role on KB category' do
+        include_context 'updating itself', object_name: :category
+      end
+    end
+
+    describe 'updating descendants' do
+      context 'when saving role on KB itself' do
+        it 'adds effective permissions to descendant categories' do
+          described_class.new(knowledge_base).update! role_editor => 'reader'
+
+          expect(category.permissions_effective)
+            .to contain_exactly have_attributes(role: role_editor, access: 'reader', permissionable: knowledge_base)
+        end
+
+        it 'removing permission opens up access to descendants' do
+          described_class.new(knowledge_base).update! role_editor => 'editor'
+          described_class.new(knowledge_base).update!(**{})
+
+          expect(category.permissions_effective).to be_blank
+        end
+
+        context 'when category has editor role has editor role with editor permission' do
+          before do
+            described_class.new(category).update! role_editor => 'editor'
+            category.reload
+
+            travel 1.minute
+          end
+
+          it 'removes identical permissions on descendant roles' do
+            described_class.new(knowledge_base).update! role_editor => 'editor'
+            category.reload
+
+            expect(category.permissions_effective)
+              .to contain_exactly have_attributes(role: role_editor, access: 'editor', permissionable: knowledge_base)
+          end
+        end
+      end
+
+      context 'when saving role on KB category' do
+        it 'adds effective permissions to descendant roles' do
+          described_class.new(category).update! role_editor => 'reader'
+
+          expect(child_category.permissions_effective)
+            .to contain_exactly have_attributes(role: role_editor, access: 'reader', permissionable: category)
+        end
+
+        context 'when child category has editor role with editor permission' do
+          before do
+            described_class.new(child_category).update! role_editor => 'editor'
+            category.reload
+            child_category.reload
+
+            travel 1.minute
+          end
+
+          it 'removes conflicting permissions on descendant roles' do
+            described_class.new(category).update! role_editor => 'none'
+            category.reload
+            child_category.reload
+
+            expect(child_category.permissions_effective)
+              .to contain_exactly have_attributes(role: role_editor, access: 'none', permissionable: category)
+          end
+
+          it 'removes identical permissions on descendant roles' do
+            described_class.new(category).update! role_editor => 'editor'
+            category.reload
+            child_category.reload
+
+            expect(child_category.permissions_effective)
+              .to contain_exactly have_attributes(role: role_editor, access: 'editor', permissionable: category)
+          end
+        end
+
+        context 'when category has role editor with none permission' do
+          before do
+            described_class.new(category).update! role_editor => 'none'
+            category.reload
+
+            travel 1.minute
+          end
+
+          it 'removing permission opens up access to descendants' do
+            described_class.new(category).update!(**{})
+            category.reload
+
+            expect(child_category.permissions_effective).to be_blank
+          end
+        end
+      end
+    end
+
+    describe 'preventing user lockout' do
+      let(:user) { create(:admin) }
+      let(:role) { user.roles.first }
+
+      shared_examples 'preventing user lockout' do |object_name:|
+        let(:object) { send(object_name) }
+
+        it 'raises an error when saving a lockout change for a given user' do
+          expect { described_class.new(object, user).update! role => 'reader' }
+            .to raise_error(Exceptions::UnprocessableEntity)
+        end
+
+        it 'allows to save same change without a user' do
+          expect { described_class.new(object).update! role => 'reader' }.not_to raise_error
+        end
+      end
+
+      context 'when saving role on KB itself' do
+        include_context 'preventing user lockout', object_name: 'knowledge_base'
+      end
+
+      context 'when saving role on KB category' do
+        include_context 'preventing user lockout', object_name: 'category'
+      end
+    end
+  end
+
+  describe '#update_using_params!' do
+    subject(:updater) { described_class.new(category) }
+
+    let(:role) { create(:role, permission_names: %w[knowledge_base.editor]) }
+    let(:category) { create(:knowledge_base_category) }
+
+    it 'calls update! with given roles' do
+      updater.update_using_params!({ permissions: { role.id => 'editor' } })
+      expect(category.permissions.first).to have_attributes(role: role, access: 'editor', permissionable: category)
+    end
+
+    it 'raises an error when given a non existant role' do
+      expect { updater.update_using_params!({ permissions: { (role.id + 1) => 'editor' } }) }
+        .to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+end

spec/models/knowledge_base/category_spec.rb

@@ -16,6 +16,7 @@ RSpec.describe KnowledgeBase::Category, type: :model, current_user_id: 1 do
 
   it { is_expected.to have_many(:answers) }
   it { is_expected.to have_many(:children) }
+  it { is_expected.to have_many(:permissions) }
   it { is_expected.to belong_to(:parent).optional }
   it { is_expected.to belong_to(:knowledge_base) }
 

spec/models/knowledge_base/permission_spec.rb

@@ -0,0 +1,50 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+require 'models/contexts/factory_context'
+
+RSpec.describe KnowledgeBase::Permission, type: :model do
+  subject(:kb_category_permission) { create(:knowledge_base_permission) }
+
+  include_context 'basic Knowledge Base'
+  include_context 'factory'
+
+  describe '#permissionable' do
+    it { is_expected.to belong_to(:permissionable).touch(true) }
+
+    it 'allows multiple permissions for the same category' do
+      permission = build(:knowledge_base_permission, permissionable: kb_category_permission.permissionable)
+      permission.save
+
+      expect(permission).to be_persisted
+    end
+
+    it 'does not allow same role/permission conbination' do
+      permission = build(:knowledge_base_permission,
+                         permissionable: kb_category_permission.permissionable,
+                         role:           kb_category_permission.role)
+      permission.save
+
+      expect(permission).not_to be_persisted
+    end
+  end
+
+  describe '#role' do
+    it { is_expected.to belong_to(:role) }
+
+    it 'allows multiple permissions for the same category' do
+      permission = build(:knowledge_base_permission, role: kb_category_permission.role)
+      permission.save
+
+      expect(permission).to be_persisted
+    end
+  end
+
+  describe '#access' do
+    it { is_expected.to validate_presence_of(:access).with_message(%r{}) }
+    it { is_expected.to allow_value('editor').for(:access) }
+    it { is_expected.to allow_value('reader').for(:access) }
+    it { is_expected.to allow_value('none').for(:access) }
+    it { is_expected.not_to allow_value('foobar').for(:access) }
+  end
+end

spec/policies/knowledge_base/answer_policy_spec.rb

@@ -0,0 +1,64 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+require 'policies/knowledge_base_policy_examples'
+
+describe KnowledgeBase::AnswerPolicy do
+  subject(:policy) { described_class.new(user, record) }
+
+  let(:record) { create(:knowledge_base_answer) }
+  let(:user)   { create(:user) }
+
+  shared_context 'with answer visibility' do |visible:, visible_internally:|
+    before do
+      allow(record).to receive(:visible?).and_return(visible)
+      allow(record).to receive(:visible_internally?).and_return(visible_internally)
+    end
+  end
+
+  describe '#show?' do
+    context 'when visible and visible internally' do
+      include_examples 'with answer visibility', visible: true, visible_internally: true
+      include_examples 'with KB policy check', editor: true, reader: true, none: true, method: :show?
+    end
+
+    context 'when visible internally only' do
+      include_examples 'with answer visibility', visible: false, visible_internally: true
+      include_examples 'with KB policy check', editor: true, reader: true, none: false, method: :show?
+    end
+
+    context 'when not visible' do
+      include_examples 'with answer visibility', visible: false, visible_internally: false
+      include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :show?
+    end
+  end
+
+  describe '#show_public?' do
+    context 'when visible and visible internally' do
+      include_examples 'with answer visibility', visible: true, visible_internally: true
+      include_examples 'with KB policy check', editor: true, reader: true, none: true, method: :show_public?
+    end
+
+    context 'when visible internally only' do
+      include_examples 'with answer visibility', visible: false, visible_internally: true
+      include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :show_public?
+    end
+
+    context 'when not visible' do
+      include_examples 'with answer visibility', visible: false, visible_internally: false
+      include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :show_public?
+    end
+  end
+
+  describe '#update?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :update?
+  end
+
+  describe '#create?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :create?
+  end
+
+  describe '#destroy?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :destroy?
+  end
+end

spec/policies/knowledge_base/category_policy_spec.rb

@@ -0,0 +1,45 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+require 'policies/knowledge_base_policy_examples'
+
+describe KnowledgeBase::CategoryPolicy do
+  subject(:policy) { described_class.new(user, record) }
+
+  let(:record) { create(:knowledge_base_category) }
+  let(:user)   { create(:user) }
+
+  describe '#show?' do
+    include_examples 'with KB policy check', editor: true, reader: true, none: false, method: :show?
+  end
+
+  describe '#show_public?' do
+    context 'when category has public content' do
+      before { allow(record).to receive(:public_content?).and_return(true) }
+
+      include_examples 'with KB policy check', editor: true, reader: true, none: true, method: :show_public?
+    end
+
+    context 'when category has no public content' do
+      before { allow(record).to receive(:public_content?).and_return(false) }
+
+      include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :show_public?
+    end
+  end
+
+  describe '#permissions?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :permissions?
+  end
+
+  describe '#update?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :update?
+  end
+
+  describe '#create?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :create?, access_method: :parent_access
+  end
+
+  describe '#destroy?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :destroy?, access_method: :parent_access
+  end
+end

spec/policies/knowledge_base_policy_examples.rb

@@ -0,0 +1,29 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+RSpec.shared_context 'with KB policy check' do |editor:, reader:, none:, method:, access_method: :access|
+  let(:access_method) { access_method }
+
+  it 'returns true if editor' do
+    mock_permission 'editor'
+
+    expect(policy.send(method)).to be editor
+  end
+
+  it 'returns true if reader' do
+    mock_permission 'reader'
+
+    expect(policy.send(method)).to be reader
+  end
+
+  it 'returns false if none' do
+    mock_permission 'none'
+
+    expect(policy.send(method)).to be none
+  end
+
+  def mock_permission(access)
+    allow(policy)
+      .to receive(access_method)
+      .and_return(access)
+  end
+end

spec/policies/knowledge_base_policy_spec.rb

@@ -0,0 +1,19 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+require 'policies/knowledge_base_policy_examples'
+
+describe KnowledgeBasePolicy do
+  subject(:policy) { described_class.new(user, record) }
+
+  let(:record) { create(:knowledge_base) }
+  let(:user)   { create(:user) }
+
+  describe '#show?' do
+    include_examples 'with KB policy check', editor: true, reader: true, none: false, method: :show?
+  end
+
+  describe 'update?' do
+    include_examples 'with KB policy check', editor: true, reader: false, none: false, method: :update?
+  end
+end

spec/support/assets_matchers.rb

@@ -54,7 +54,9 @@ RSpec::Matchers.define :include_assets_of do
   #
   # @return [Hash, nil]
   def find_assets_of(object, actual)
-    actual.dig(object.class.name.gsub(%r{::}, ''), object.id.to_s)
+    actual
+      .deep_stringify_keys
+      .dig(object.class.name.gsub(%r{::}, ''), object.id.to_s)
   end
 end
 

spec/system/knowledge_base/locale/answer/edit_spec.rb

@@ -96,18 +96,6 @@ RSpec.describe 'Knowledge Base Locale Answer Edit', type: :system do
     let(:new_tag_name) { 'capybara_kb_tag' }
 
     it 'adds a new tag' do
-      within :active_content do
-        click '.js-newTagLabel'
-
-        elem = find('.js-newTagInput')
-        elem.fill_in with: new_tag_name
-        elem.send_keys :return
-
-        expect(page).to have_css('a.js-tag', text: new_tag_name)
-      end
-    end
-
-    it 'saves new tag to the database' do
       within :active_content do
         click '.js-newTagLabel'
 
@@ -116,6 +104,7 @@ RSpec.describe 'Knowledge Base Locale Answer Edit', type: :system do
         elem.send_keys :return
 
         wait.until_exists { published_answer_with_tag.reload.tag_list.include? new_tag_name }
+        expect(page).to have_css('a.js-tag', text: new_tag_name)
       end
     end
 
@@ -127,22 +116,10 @@ RSpec.describe 'Knowledge Base Locale Answer Edit', type: :system do
 
     it 'deletes a tag' do
       within :active_content do
-        click '.js-newTagLabel'
-
         find('.list-item', text: published_answer_tag_name)
           .find('.js-delete').click
 
         expect(page).to have_no_css('a.js-tag', text: published_answer_tag_name)
-      end
-    end
-
-    it 'deletes the tag from the database' do
-      within :active_content do
-        click '.js-newTagLabel'
-
-        find('.list-item', text: published_answer_tag_name)
-          .find('.js-delete').click
-
         wait.until_exists { published_answer_with_tag.reload.tag_list.exclude? published_answer_tag_name }
       end
     end

spec/system/knowledge_base/locale/category/permissions_spec.rb

@@ -0,0 +1,177 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe 'Knowledge Base Locale Category Permissions', type: :system do
+  include_context 'basic Knowledge Base'
+
+  let(:role_editor) { Role.find_by name: 'Admin' }
+  let(:role_another_editor) { create(:role, permission_names: %w[knowledge_base.editor]) }
+  let(:role_reader) { Role.find_by name: 'Agent' }
+
+  let(:child_category) { create(:knowledge_base_category, parent: category) }
+
+  it 'shows roles with has KB permissions only' do
+    open_page category
+
+    find('[data-action=permissions]').click
+
+    in_modal disappears: false do
+      expect(page)
+        .to have_text(%r{Admin}i)
+        .and(have_text(%r{Agent}i))
+        .and(have_no_text(%r{Customer}i))
+    end
+  end
+
+  describe 'permissions shown' do
+    it 'shows existing permissions when category has no permissions' do
+      open_page category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_editor.id}'][value='editor'][checked]:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_editor.id}'][value='reader']:not([disabled])", visible: :all))
+          .and(have_css("input[name='#{role_editor.id}'][value='none']:not([disabled])", visible: :all))
+      end
+    end
+
+    it 'shows existing permissions when category has inerited permissions only' do
+      KnowledgeBase::PermissionsUpdate.new(category).update! role_reader => 'none'
+
+      open_page category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_reader.id}'][value='reader']:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_reader.id}'][value='none'][checked]:not([disabled])", visible: :all))
+      end
+    end
+
+    it 'shows existing permissions' do
+      KnowledgeBase::PermissionsUpdate.new(child_category).update! role_reader => 'none'
+
+      open_page child_category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_reader.id}'][value='reader']:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_reader.id}'][value='none'][checked]:not([disabled])", visible: :all))
+      end
+    end
+
+    it 'shows editor permission not limited by parent category being read only' do
+      KnowledgeBase::PermissionsUpdate.new(category).update! role_another_editor => 'reader'
+
+      open_page child_category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_another_editor.id}'][value='none']:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_another_editor.id}'][value='reader'][checked]:not([disabled])", visible: :all))
+          .and(have_css("input[name='#{role_another_editor.id}'][value='editor'][disabled]", visible: :all))
+      end
+    end
+
+    it 'shows editor permissions limited by parent category' do
+      KnowledgeBase::PermissionsUpdate.new(category).update! role_another_editor => 'none'
+
+      open_page child_category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_another_editor.id}'][value='none'][checked]:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_another_editor.id}'][value='reader'][disabled]", visible: :all))
+          .and(have_css("input[name='#{role_another_editor.id}'][value='editor'][disabled]", visible: :all))
+      end
+    end
+
+    it 'shows reader permissions limited by parent category' do
+      KnowledgeBase::PermissionsUpdate.new(category).update! role_reader => 'none'
+
+      open_page child_category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_reader.id}'][value='none'][checked]:not([disabled])", visible: :all)
+          .and(have_css("input[name='#{role_reader.id}'][value='reader'][disabled]", visible: :all))
+      end
+    end
+  end
+
+  describe 'saving changes' do
+    it 'saves permissions' do
+      open_page category
+
+      find('[data-action=permissions]').click
+
+      in_modal do
+        find("input[name='#{role_reader.id}'][value='none']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+      end
+
+      expect(category.reload.permissions)
+        .to contain_exactly(
+          have_attributes(role: role_reader, access: 'none', permissionable: category),
+          have_attributes(role: role_editor, access: 'editor', permissionable: category)
+        )
+    end
+
+    it 'allows to modify existing permissions' do
+      KnowledgeBase::PermissionsUpdate.new(category).update! role_reader => 'none'
+
+      open_page category
+
+      find('[data-action=permissions]').click
+
+      in_modal do
+        find("input[name='#{role_reader.id}'][value='reader']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+      end
+
+      expect(category.reload.permissions)
+        .to contain_exactly(
+          have_attributes(role: role_reader, access: 'reader', permissionable: category),
+          have_attributes(role: role_editor, access: 'editor', permissionable: category)
+        )
+    end
+
+    it 'does not allow to lock user himself' do
+      open_page category
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        find("input[name='#{role_editor.id}'][value='reader']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+
+        expect(page).to have_css('.alert')
+      end
+    end
+  end
+
+  def open_page(category)
+    visit "knowledge_base/#{knowledge_base.id}/locale/#{Locale.first.locale}/category/#{category.id}/edit"
+  end
+end

spec/system/knowledge_base/locale/knowledge_base/permissions_spec.rb

@@ -0,0 +1,118 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe 'Knowledge Base Locale Knowledge Base Permissions', type: :system do
+  include_context 'basic Knowledge Base'
+
+  let(:role_editor) { Role.find_by name: 'Admin' }
+  let(:role_another_editor) { create(:role, permission_names: %w[knowledge_base.editor]) }
+  let(:role_reader) { Role.find_by name: 'Agent' }
+
+  it 'shows roles with has KB permissions only' do
+    open_page
+
+    find('[data-action=permissions]').click
+
+    in_modal disappears: false do
+      expect(page)
+        .to have_text(%r{Admin}i)
+        .and(have_text(%r{Agent}i))
+        .and(have_no_text(%r{Customer}i))
+    end
+  end
+
+  describe 'permissions shown' do
+    it 'shows existing permissions when KB has no permissions' do
+      open_page
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_editor.id}'][value='editor'][checked]", visible: :all)
+          .and(have_css("input[name='#{role_editor.id}'][value='reader']", visible: :all))
+      end
+    end
+
+    it 'shows existing permissions' do
+      KnowledgeBase::PermissionsUpdate.new(knowledge_base).update! role_another_editor => 'reader'
+
+      open_page
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        expect(page)
+          .to have_css("input[name='#{role_another_editor.id}'][value='reader'][checked]", visible: :all)
+          .and(have_css("input[name='#{role_another_editor.id}'][value='editor']", visible: :all))
+      end
+    end
+  end
+
+  describe 'saving changes' do
+    it 'saves permissions' do
+      role_another_editor
+      open_page
+
+      find('[data-action=permissions]').click
+
+      in_modal do
+        find("input[name='#{role_another_editor.id}'][value='reader']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+      end
+
+      expect(knowledge_base.reload.permissions)
+        .to contain_exactly(
+          have_attributes(role: role_reader, access: 'reader', permissionable: knowledge_base),
+          have_attributes(role: role_another_editor, access: 'reader', permissionable: knowledge_base),
+          have_attributes(role: role_editor, access: 'editor', permissionable: knowledge_base)
+        )
+    end
+
+    it 'allows to modify existing permissions' do
+      KnowledgeBase::PermissionsUpdate.new(knowledge_base).update! role_another_editor => 'reader'
+      open_page
+
+      find('[data-action=permissions]').click
+
+      in_modal do
+        find("input[name='#{role_another_editor.id}'][value='editor']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+      end
+
+      expect(knowledge_base.reload.permissions)
+        .to contain_exactly(
+          have_attributes(role: role_reader, access: 'reader', permissionable: knowledge_base),
+          have_attributes(role: role_another_editor, access: 'editor', permissionable: knowledge_base),
+          have_attributes(role: role_editor, access: 'editor', permissionable: knowledge_base)
+        )
+    end
+
+    it 'does not allow to lock user himself' do
+      open_page
+
+      find('[data-action=permissions]').click
+
+      in_modal disappears: false do
+        find("input[name='#{role_editor.id}'][value='reader']", visible: :all)
+          .ancestor('label')
+          .click
+
+        click_on 'Submit'
+
+        expect(page).to have_css('.alert')
+      end
+    end
+  end
+
+  def open_page
+    visit "knowledge_base/#{knowledge_base.id}/locale/#{Locale.first.locale}/edit"
+  end
+end

spec/system/ticket/zoom_spec.rb

@@ -939,7 +939,6 @@ RSpec.describe 'Ticket zoom', type: :system do
 
     def forward
       within :active_content do
-        # binding.pry
         wait.until_exists { find('.textBubble-content .richtext-content') }
         click '.js-ArticleAction[data-type=emailForward]'
         fill_in 'To', with: 'customer@example.com'