feat(ui): close modal window when user hits the Escape key

ui/package.json

@@ -34,6 +34,7 @@
     "react-datepicker": "2.8.0",
     "react-dom": "16.8.6",
     "react-highlighter": "0.4.3",
+    "react-hotkeys": "2.0.0",
     "react-idle-timer": "4.2.8",
     "react-input-range": "1.3.0",
     "react-js-pagination": "3.0.2",

ui/src/Components/Grid/AlertGrid/AlertGroup/Silence/DeleteSilence.js

@@ -281,7 +281,7 @@ const DeleteSilence = observer(
             <FontAwesomeIcon className="mr-1" icon={faTrash} />
             Delete
           </span>
-          <Modal isOpen={this.toggle.visible}>
+          <Modal isOpen={this.toggle.visible} toggleOpen={this.toggle.toggle}>
             <DeleteSilenceModalContent
               alertStore={alertStore}
               alertmanager={alertmanager}

ui/src/Components/MainModal/index.js

@@ -59,7 +59,7 @@ const MainModal = observer(
               </span>
             </TooltipWrapper>
           </li>
-          <Modal isOpen={this.toggle.show}>
+          <Modal isOpen={this.toggle.show} toggleOpen={this.toggle.toggle}>
             <React.Suspense
               fallback={
                 <h1 className="display-1 text-secondary p-5 m-auto">

ui/src/Components/Modal/index.js

@@ -6,6 +6,8 @@ import { observer } from "mobx-react";
 
 import { disableBodyScroll, clearAllBodyScrollLocks } from "body-scroll-lock";
 
+import { HotKeys } from "react-hotkeys";
+
 import {
   MountModal,
   MountModalBackdrop
@@ -16,6 +18,7 @@ const Modal = observer(
     static propTypes = {
       size: PropTypes.oneOf(["lg", "xl"]),
       isOpen: PropTypes.bool.isRequired,
+      toggleOpen: PropTypes.func.isRequired,
       children: PropTypes.node.isRequired
     };
     static defaultProps = {
@@ -25,11 +28,13 @@ const Modal = observer(
     constructor(props) {
       super(props);
       this.modalRef = React.createRef();
+      this.HotKeysRef = React.createRef();
     }
 
     toggleBodyClass = isOpen => {
       document.body.classList.toggle("modal-open", isOpen);
       if (isOpen) {
+        this.HotKeysRef.current.focus();
         disableBodyScroll(this.modalRef.current);
       } else {
         clearAllBodyScrollLocks();
@@ -51,10 +56,14 @@ const Modal = observer(
     }
 
     render() {
-      const { size, isOpen, children, ...props } = this.props;
+      const { size, isOpen, toggleOpen, children, ...props } = this.props;
 
       return ReactDOM.createPortal(
-        <React.Fragment>
+        <HotKeys
+          innerRef={this.HotKeysRef}
+          keyMap={{ CLOSE: "Escape" }}
+          handlers={{ CLOSE: toggleOpen }}
+        >
           <MountModal in={isOpen} unmountOnExit {...props}>
             <div ref={this.modalRef} className="modal d-block" role="dialog">
               <div className={`modal-dialog modal-${size}`} role="document">
@@ -65,7 +74,7 @@ const Modal = observer(
           <MountModalBackdrop in={isOpen} unmountOnExit>
             <div className="modal-backdrop d-block" />
           </MountModalBackdrop>
-        </React.Fragment>,
+        </HotKeys>,
         document.body
       );
     }

ui/src/Components/Modal/index.test.js

@@ -4,14 +4,20 @@ import { mount } from "enzyme";
 
 import { Modal } from ".";
 
+const fakeToggle = jest.fn();
+
 const MountedModal = isOpen => {
   return mount(
-    <Modal isOpen={isOpen}>
+    <Modal isOpen={isOpen} toggleOpen={fakeToggle}>
       <div />
     </Modal>
   );
 };
 
+afterEach(() => {
+  jest.resetAllMocks();
+});
+
 describe("<Modal />", () => {
   it("'modal-open' class is appended to body node when modal is visible", () => {
     MountedModal(true);
@@ -32,11 +38,17 @@ describe("<Modal />", () => {
   it("passes extra props down to the MountModal animation component", () => {
     const onExited = jest.fn();
     const tree = mount(
-      <Modal isOpen={true} onExited={onExited}>
+      <Modal isOpen={true} toggleOpen={fakeToggle} onExited={onExited}>
         <div />
       </Modal>
     );
     const mountModal = tree.find("MountModal");
     expect(mountModal.props().onExited).toBe(onExited);
   });
+
+  it("toggleOpen is called after pressing 'esc'", () => {
+    const tree = MountedModal(true);
+    tree.simulate("keyDown", { key: "Escape", keyCode: 27, which: 27 });
+    expect(fakeToggle).toHaveBeenCalled();
+  });
 });

ui/src/Components/OverviewModal/index.js

@@ -58,7 +58,11 @@ const OverviewModal = observer(
               </div>
             </Flash>
           </TooltipWrapper>
-          <Modal size="xl" isOpen={this.toggle.show}>
+          <Modal
+            size="xl"
+            isOpen={this.toggle.show}
+            toggleOpen={this.toggle.toggle}
+          >
             <React.Suspense
               fallback={
                 <h1 className="display-1 text-secondary p-5 m-auto">

ui/src/Components/SilenceModal/index.js

@@ -51,6 +51,7 @@ const SilenceModal = observer(
           </li>
           <Modal
             isOpen={silenceFormStore.toggle.visible}
+            toggleOpen={silenceFormStore.toggle.toggle}
             onExited={silenceFormStore.data.resetProgress}
           >
             <React.Suspense