89 lines
2.6 KiB
JavaScript
89 lines
2.6 KiB
JavaScript
const { net } = require('electron')
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const requestTimeoutSeconds = 10;
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// Simple promise wrapper around Electron's net.request feature.
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// https://www.electronjs.org/docs/api/client-request
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const netRequestPromise = url => new Promise((resolve, reject) => {
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try {
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const request = net.request(url);
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// We don't worry about canceling the request timeout timer once a
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// request ends because: request.abort() has no effect after a request
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// ends and the promise will already have been completed, so a rejection
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// has no effect either.
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const requestTimeout =
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setTimeout(() => {
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request.abort();
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reject(new Error('Request timeout'));
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}, requestTimeoutSeconds * 1000);
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request.on('error', reject);
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request.on('response', resolve);
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request.end();
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} catch (e) {
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reject(e);
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}
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});
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// Provides a singleton class instance to enable a consistent view of
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// runtime settings across the application.
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// Runtime settings are any configuration, especially user-specified,
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// set up at runtime. For example, the Boundary origin is a runtime setting.
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class RuntimeSettings {
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// Internal private origin is exposed via getter/setter below.
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#origin = undefined;
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/**
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* The user-specified Boundary origin, which should be allowed by CSP.
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* @type {?string}
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*/
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get origin() { return this.#origin; }
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set origin(origin) {
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if (this.#origin !== origin) {
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this.#origin = origin;
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this.triggerOriginChanged();
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}
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}
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/**
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* Validates the origin is reachable and has a scopes endpoint.
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*/
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async validateOrigin(origin) {
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// If the origin is the Electron origin, it is automatically valid.
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if (origin === 'serve://boundary') return true;
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// Otherwise, check if scopes can be loaded from the specified origin.
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// Scopes are required by the desktop client, so this is a simple smoke
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// test to see if the origin is API-compatible with the desktop client.
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const scopesEndpoint = `${origin}/v1/scopes`;
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try {
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await netRequestPromise(scopesEndpoint);
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} catch (e) {
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throw new Error(`Origin ${origin} could not be validated.`);
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}
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}
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/**
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* Sets the origin to null.
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*/
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async resetOrigin() {
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this.origin = null;
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}
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// Quick and dirty event handler pattern to enable the application to respond
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// when the origin is changed.
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#originWatchers = [];
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onOriginChange(fn) {
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this.#originWatchers.push(fn);
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}
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triggerOriginChanged() {
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this.#originWatchers.forEach(fn => fn(this.#origin));
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}
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}
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const runtimeSettings = new RuntimeSettings();
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module.exports = runtimeSettings;
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