Stop Playwright tracing during E2E login to prevent credential exposure

packages/e2e/helpers/browser-login.ts

@@ -1,5 +1,24 @@
 import type {Page} from '@playwright/test'
 
+/**
+ * Sets an input field's value via the DOM, bypassing Playwright's fill() API.
+ *
+ * Security (shopify/bugbounty#3638393): Playwright's test runner logs every
+ * fill() call — including the literal value — into trace files, which are
+ * uploaded as publicly downloadable CI artifacts. Using evaluate() to set
+ * the value directly avoids the Playwright action log entirely. The runner's
+ * tracing instruments at a level above context.tracing, so context.tracing.stop()
+ * does NOT prevent the leak.
+ */
+async function fillSensitive(page: Page, selector: string, value: string): Promise<void> {
+  const locator = page.locator(selector).first()
+  await locator.evaluate((el, val) => {
+    ;(el as unknown as {value: string}).value = val
+    el.dispatchEvent(new Event('input', {bubbles: true}))
+    el.dispatchEvent(new Event('change', {bubbles: true}))
+  }, value)
+}
+
 /**
  * Completes the Shopify OAuth login flow on a Playwright page.
  */
@@ -9,12 +28,12 @@ export async function completeLogin(page: Page, loginUrl: string, email: string,
   try {
     // Fill in email
     await page.waitForSelector('input[name="account[email]"], input[type="email"]', {timeout: 60_000})
-    await page.locator('input[name="account[email]"], input[type="email"]').first().fill(email)
+    await fillSensitive(page, 'input[name="account[email]"], input[type="email"]', email)
     await page.locator('button[type="submit"]').first().click()
 
     // Fill in password
     await page.waitForSelector('input[name="account[password]"], input[type="password"]', {timeout: 60_000})
-    await page.locator('input[name="account[password]"], input[type="password"]').first().fill(password)
+    await fillSensitive(page, 'input[name="account[password]"], input[type="password"]', password)
     await page.locator('button[type="submit"]').first().click()
 
     // Handle any confirmation/approval page
@@ -27,12 +46,10 @@ export async function completeLogin(page: Page, loginUrl: string, email: string,
       // No confirmation page — expected
     }
   } catch (error) {
-    const pageContent = await page.content().catch(() => '(failed to get content)')
     const pageUrl = page.url()
-    throw new Error(
-      `Login failed at ${pageUrl}\n` +
-        `Original error: ${error}\n` +
-        `Page HTML (first 2000 chars): ${pageContent.slice(0, 2000)}`,
-    )
+    // Clear the page so failure artifacts (screenshots, trace snapshots) do
+    // not capture the login form with credentials still populated.
+    await page.goto('about:blank').catch(() => {})
+    throw new Error(`Login failed at ${pageUrl}\nOriginal error: ${error}`)
   }
 }