Add Security Warning Bar for untrusted notebooks (#970)

* Add Security Warning Bar for untrusted notebooks

* Update

* Another update

* Add a snapshot test

* UX updates

* More updates

* Add tests

* Update test snapshot

* Update string

* Update security message

src/Explorer/Notebook/SecurityWarningBar/SecurityWarningBar.tsx

@@ -0,0 +1,93 @@
+import { MessageBar, MessageBarButton, MessageBarType } from "@fluentui/react";
+import { actions, AppState } from "@nteract/core";
+import React from "react";
+import { connect } from "react-redux";
+import { Dispatch } from "redux";
+import { NotebookUtil } from "../NotebookUtil";
+
+export interface SecurityWarningBarPureProps {
+  contentRef: string;
+}
+
+interface SecurityWarningBarDispatchProps {
+  markNotebookAsTrusted: (contentRef: string) => void;
+  saveNotebook: (contentRef: string) => void;
+}
+
+type SecurityWarningBarProps = SecurityWarningBarPureProps & StateProps & SecurityWarningBarDispatchProps;
+
+interface SecurityWarningBarState {
+  isBarDismissed: boolean;
+}
+
+export class SecurityWarningBar extends React.Component<SecurityWarningBarProps, SecurityWarningBarState> {
+  constructor(props: SecurityWarningBarProps) {
+    super(props);
+
+    this.state = {
+      isBarDismissed: false,
+    };
+  }
+
+  render(): JSX.Element {
+    return this.props.isNotebookUntrusted && !this.state.isBarDismissed ? (
+      <MessageBar
+        messageBarType={MessageBarType.warning}
+        isMultiline={false}
+        onDismiss={() => this.setState({ isBarDismissed: true })}
+        dismissButtonAriaLabel="Close"
+        actions={
+          <MessageBarButton
+            onClick={() => {
+              this.props.markNotebookAsTrusted(this.props.contentRef);
+              this.props.saveNotebook(this.props.contentRef);
+            }}
+          >
+            Trust Notebook
+          </MessageBarButton>
+        }
+      >
+        {" "}
+        This notebook was downloaded from the public gallery. Running code cells from a notebook authored by someone
+        else may involve security risks.
+      </MessageBar>
+    ) : (
+      <></>
+    );
+  }
+}
+
+interface StateProps {
+  isNotebookUntrusted: boolean;
+}
+
+interface InitialProps {
+  contentRef: string;
+}
+
+// Redux
+const makeMapStateToProps = (state: AppState, initialProps: InitialProps) => {
+  const mapStateToProps = (state: AppState): StateProps => ({
+    isNotebookUntrusted: NotebookUtil.isNotebookUntrusted(state, initialProps.contentRef),
+  });
+  return mapStateToProps;
+};
+
+const makeMapDispatchToProps = () => {
+  const mapDispatchToProps = (dispatch: Dispatch): SecurityWarningBarDispatchProps => {
+    return {
+      markNotebookAsTrusted: (contentRef: string) => {
+        return dispatch(
+          actions.deleteMetadataField({
+            contentRef,
+            field: "untrusted",
+          })
+        );
+      },
+      saveNotebook: (contentRef: string) => dispatch(actions.save({ contentRef })),
+    };
+  };
+  return mapDispatchToProps;
+};
+
+export default connect(makeMapStateToProps, makeMapDispatchToProps)(SecurityWarningBar);