MM-32396 Create endpoint for listing all the roles (#16988)

* Create an endpoint for listing roles

* Add function to client model

* Create tests for listing roles endpoint

* Apply code review suggestions

* Restore GetAllRoles app method

* Use AppContext instead of App

* Minor fix

* Refactor according to new changes

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/app_iface.go

@@ -543,6 +543,7 @@ type AppIface interface {
 	GetAllPrivateTeams() ([]*model.Team, *model.AppError)
 	GetAllPublicTeams() ([]*model.Team, *model.AppError)
 	GetAllRemoteClusters(filter model.RemoteClusterQueryFilter) ([]*model.RemoteCluster, *model.AppError)
+	GetAllRoles() ([]*model.Role, *model.AppError)
 	GetAllStatuses() map[string]*model.Status
 	GetAllTeams() ([]*model.Team, *model.AppError)
 	GetAllTeamsPage(offset int, limit int, opts *model.TeamSearch) ([]*model.Team, *model.AppError)

app/opentracing/opentracing_layer.go

@@ -4369,6 +4369,28 @@ func (a *OpenTracingAppLayer) GetAllRemoteClusters(filter model.RemoteClusterQue
 	return resultVar0, resultVar1
 }
 
+func (a *OpenTracingAppLayer) GetAllRoles() ([]*model.Role, *model.AppError) {
+	origCtx := a.ctx
+	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.GetAllRoles")
+
+	a.ctx = newCtx
+	a.app.Srv().Store.SetContext(newCtx)
+	defer func() {
+		a.app.Srv().Store.SetContext(origCtx)
+		a.ctx = origCtx
+	}()
+
+	defer span.Finish()
+	resultVar0, resultVar1 := a.app.GetAllRoles()
+
+	if resultVar1 != nil {
+		span.LogFields(spanlog.Error(resultVar1))
+		ext.Error.Set(span, true)
+	}
+
+	return resultVar0, resultVar1
+}
+
 func (a *OpenTracingAppLayer) GetAllStatuses() map[string]*model.Status {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.GetAllStatuses")

app/role.go

@@ -37,6 +37,20 @@ func (a *App) GetRole(id string) (*model.Role, *model.AppError) {
 	return role, nil
 }
 
+func (a *App) GetAllRoles() ([]*model.Role, *model.AppError) {
+	roles, err := a.Srv().Store.Role().GetAll()
+	if err != nil {
+		return nil, model.NewAppError("GetAllRoles", "app.role.get_all.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	appErr := a.Srv().mergeChannelHigherScopedPermissions(roles)
+	if appErr != nil {
+		return nil, appErr
+	}
+
+	return roles, nil
+}
+
 func (s *Server) GetRoleByName(ctx context.Context, name string) (*model.Role, *model.AppError) {
 	role, nErr := s.Store.Role().GetByName(ctx, name)
 	if nErr != nil {

app/role_test.go

@@ -61,6 +61,20 @@ func TestGetRoleByID(t *testing.T) {
 	})
 }
 
+func TestGetAllRoles(t *testing.T) {
+	testPermissionInheritance(t, func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData) {
+		actualRoles, err := th.App.GetAllRoles()
+		require.Nil(t, err)
+		for _, actualRole := range actualRoles {
+			if actualRole.Id == testData.channelRole.Id {
+				require.NotNil(t, actualRole)
+				require.Equal(t, testData.channelRole.Id, actualRole.Id)
+				require.Equal(t, testData.shouldHavePermission, utils.StringInSlice(testData.permission.Id, actualRole.Permissions), "row: %+v", testData.truthTableRow)
+			}
+		}
+	})
+}
+
 // testPermissionInheritance tests 48 combinations of scheme, permission, role data.
 func testPermissionInheritance(t *testing.T, testCallback func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData)) {
 	th := Setup(t).InitBasic()