feat: #11067 prevent removing last grafana admin permissions

pkg/api/admin_users.go

@@ -76,6 +76,7 @@ func AdminUpdateUserPassword(c *m.ReqContext, form dtos.AdminUpdateUserPasswordF
 	c.JsonOK("User password updated")
 }
 
+// PUT /api/admin/users/:id/permissions
 func AdminUpdateUserPermissions(c *m.ReqContext, form dtos.AdminUpdateUserPermissionsForm) {
 	userID := c.ParamsInt64(":id")
 
@@ -85,6 +86,11 @@ func AdminUpdateUserPermissions(c *m.ReqContext, form dtos.AdminUpdateUserPermis
 	}
 
 	if err := bus.Dispatch(&cmd); err != nil {
+		if err == m.ErrLastGrafanaAdmin {
+			c.JsonApiErr(400, m.ErrLastGrafanaAdmin.Error(), nil)
+			return
+		}
+
 		c.JsonApiErr(500, "Failed to update user permissions", err)
 		return
 	}

pkg/api/admin_users_test.go

@@ -0,0 +1,50 @@
+package api
+
+import (
+	"testing"
+
+	"github.com/grafana/grafana/pkg/api/dtos"
+	"github.com/grafana/grafana/pkg/bus"
+	m "github.com/grafana/grafana/pkg/models"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestAdminApiEndpoint(t *testing.T) {
+	role := m.ROLE_ADMIN
+	Convey("Given a server admin attempts to remove themself as an admin", t, func() {
+
+		updateCmd := dtos.AdminUpdateUserPermissionsForm{
+			IsGrafanaAdmin: false,
+		}
+
+		bus.AddHandler("test", func(cmd *m.UpdateUserPermissionsCommand) error {
+			return m.ErrLastGrafanaAdmin
+		})
+
+		putAdminScenario("When calling PUT on", "/api/admin/users/1/permissions", "/api/admin/users/:id/permissions", role, updateCmd, func(sc *scenarioContext) {
+			sc.fakeReqWithParams("PUT", sc.url, map[string]string{}).exec()
+			So(sc.resp.Code, ShouldEqual, 400)
+		})
+	})
+}
+
+func putAdminScenario(desc string, url string, routePattern string, role m.RoleType, cmd dtos.AdminUpdateUserPermissionsForm, fn scenarioFunc) {
+	Convey(desc+" "+url, func() {
+		defer bus.ClearBusHandlers()
+
+		sc := setupScenarioContext(url)
+		sc.defaultHandler = Wrap(func(c *m.ReqContext) {
+			sc.context = c
+			sc.context.UserId = TestUserID
+			sc.context.OrgId = TestOrgID
+			sc.context.OrgRole = role
+
+			AdminUpdateUserPermissions(c, cmd)
+		})
+
+		sc.m.Put(routePattern, sc.defaultHandler)
+
+		fn(sc)
+	})
+}