code-server/extensions/markdown-language-features/preview-src/csp.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { MessagePoster } from './messaging';
import { getSettings } from './settings';
import { getStrings } from './strings';
/**
* Shows an alert when there is a content security policy violation.
*/
export class CspAlerter {
private didShow = false;
private didHaveCspWarning = false;
private messaging?: MessagePoster;
constructor() {
document.addEventListener('securitypolicyviolation', () => {
this.onCspWarning();
});
window.addEventListener('message', (event) => {
if (event && event.data && event.data.name === 'vscode-did-block-svg') {
this.onCspWarning();
}
});
}
public setPoster(poster: MessagePoster) {
this.messaging = poster;
if (this.didHaveCspWarning) {
this.showCspWarning();
}
}
private onCspWarning() {
this.didHaveCspWarning = true;
this.showCspWarning();
}
private showCspWarning() {
const strings = getStrings();
const settings = getSettings();
if (this.didShow || settings.disableSecurityWarnings || !this.messaging) {
return;
}
this.didShow = true;
const notification = document.createElement('a');
notification.innerText = strings.cspAlertMessageText;
notification.setAttribute('id', 'code-csp-warning');
notification.setAttribute('title', strings.cspAlertMessageTitle);
notification.setAttribute('role', 'button');
notification.setAttribute('aria-label', strings.cspAlertMessageLabel);
notification.onclick = () => {
this.messaging!.postMessage('showPreviewSecuritySelector', { source: settings.source });
};
document.body.appendChild(notification);
}
}