feat: add incognito mode (#534)

Co-authored-by: Jef LeCompte <jeffreylec@gmail.com>

README.md

@@ -88,6 +88,7 @@ Here is a list of variables that you can use to customize your newly copied `.en
 | `EMAIL_TO` | Destination Email | Defaults to username if not set. Can be comma separated |
 | `EMAIL_USERNAME` | Gmail address | E.g.: `jensen.robbed.us@gmail.com` |
 | `HEADLESS` | Puppeteer to run headless or not | Debugging related, default: `true` |
+| `INCOGNITO` | Puppeteer to run incognito or not | Debugging related, default: `false` |
 | `IN_STOCK_WAIT_TIME` | Time to wait between requests to the same link if it has that card in stock | In seconds, default: `0` |
 | `LOG_LEVEL` | [Logging levels](https://github.com/winstonjs/winston#logging-levels) | Debugging related, default: `info` |
 | `LOW_BANDWIDTH` | Blocks images/fonts to reduce traffic | Disables ad blocker, default: `false` |

src/config.ts

@@ -109,6 +109,7 @@ function envOrNumberMax(environmentMin: string | undefined, environmentMax: stri
 
 const browser = {
 	isHeadless: envOrBoolean(process.env.HEADLESS),
+	isIncognito: envOrBoolean(process.env.INCOGNITO, false),
 	isTrusted: envOrBoolean(process.env.BROWSER_TRUSTED, false),
 	lowBandwidth: envOrBoolean(process.env.LOW_BANDWIDTH, false),
 	maxBackoff: envOrNumberMax(process.env.PAGE_BACKOFF_MIN, process.env.PAGE_BACKOFF_MAX, 3600000),

src/store/lookup.ts

@@ -35,7 +35,8 @@ async function lookup(browser: Browser, store: Store) {
 			continue;
 		}
 
-		const page = await browser.newPage();
+		const context = (config.browser.isIncognito ? await browser.createIncognitoBrowserContext() : browser.defaultBrowserContext());
+		const page = (config.browser.isIncognito ? await context.newPage() : await browser.newPage());
 		page.setDefaultNavigationTimeout(config.page.timeout);
 		await page.setUserAgent(config.page.userAgent);
 
@@ -62,8 +63,10 @@ async function lookup(browser: Browser, store: Store) {
 		// used to detect bot traffic, it introduces a 5 second page delay
 		// before redirecting to the next page
 		await processBackoffDelay(store, link, statusCode);
-
 		await closePage(page);
+		if (config.browser.isIncognito) {
+			await context.close();
+		}
 	}
 	/* eslint-enable no-await-in-loop */
 }