From 15c7894becd9ddd7a3748069f06035d0ef7cba51 Mon Sep 17 00:00:00 2001
From: jjbrunton <jamie@jbrunton.co.uk>
Date: Sun, 6 Sep 2026 20:54:19 +0100
Subject: [PATCH] fix(web): redact invite replay requests

---
 apps/web/app/PostHogPageView.test.ts | 32 +++++++++++++++++++++++++++-
 apps/web/app/providers.tsx           | 16 +++++++++++++-
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/apps/web/app/PostHogPageView.test.ts b/apps/web/app/PostHogPageView.test.ts
index 4c3cb84..94ec24d 100644
--- a/apps/web/app/PostHogPageView.test.ts
+++ b/apps/web/app/PostHogPageView.test.ts
@@ -1,6 +1,7 @@
 import { readFile } from 'node:fs/promises'
 import { describe, expect, it } from 'vitest'
-import { redactInvitePaths } from './providers'
+import type { CapturedNetworkRequest } from 'posthog-js'
+import { redactInviteNetworkRequest, redactInvitePaths } from './providers'
 
 const pageViewPath = new URL('./PostHogPageView.tsx', import.meta.url)
 const providerPath = new URL('./providers.tsx', import.meta.url)
@@ -20,6 +21,7 @@ describe('PostHog invite privacy boundary', () => {
     expect(source).toContain('capture_pageleave: false')
     expect(source).toContain('get_current_url: redactInviteUrl')
     expect(source).toContain('before_send: redactInvitePathsBeforeSend')
+    expect(source).toContain('maskCapturedNetworkRequestFn: redactInviteNetworkRequest')
     expect(source).toContain("url.pathname.startsWith('/join/')")
     expect(source).toContain('/join/[invite]')
   })
@@ -43,4 +45,32 @@ describe('PostHog invite privacy boundary', () => {
     expect(serialized).toContain('/join/[invite]')
     expect(serialized).toContain('join_page_viewed')
   })
+
+  it('redacts invite codes from replay network request URLs, headers, and bodies without mutating the capture', () => {
+    const inviteCode = 'A4K9BT2Q'
+    const request = {
+      name: `https://sauci.app/join/${inviteCode}`,
+      entryType: 'resource',
+      startTime: 1,
+      duration: 2,
+      requestHeaders: {
+        referer: `https://sauci.app/join/${inviteCode}`,
+      },
+      requestBody: JSON.stringify({ invite_path: `/join/${inviteCode}` }),
+      responseHeaders: {
+        location: `https://sauci.app/join/${inviteCode}`,
+      },
+      responseBody: JSON.stringify({ referrer: `https://sauci.app/join/${inviteCode}` }),
+    } as CapturedNetworkRequest
+
+    const redacted = redactInviteNetworkRequest(request)
+    const serialized = JSON.stringify(redacted)
+
+    expect(redacted).not.toBe(request)
+    expect(redacted.requestHeaders).not.toBe(request.requestHeaders)
+    expect(redacted.responseHeaders).not.toBe(request.responseHeaders)
+    expect(serialized).not.toContain(inviteCode)
+    expect(serialized).toContain('/join/[invite]')
+    expect(JSON.stringify(request)).toContain(inviteCode)
+  })
 })
diff --git a/apps/web/app/providers.tsx b/apps/web/app/providers.tsx
index 1347779..8c43243 100644
--- a/apps/web/app/providers.tsx
+++ b/apps/web/app/providers.tsx
@@ -2,7 +2,7 @@
 
 import posthog from 'posthog-js'
 import { PostHogProvider as PHProvider } from 'posthog-js/react'
-import type { CaptureResult } from 'posthog-js'
+import type { CapturedNetworkRequest, CaptureResult } from 'posthog-js'
 import { useEffect } from 'react'
 import { usePathname } from 'next/navigation'
 
@@ -38,6 +38,17 @@ export function redactInvitePathsBeforeSend(event: CaptureResult | null): Captur
   return event ? redactInvitePaths(event) : null
 }
 
+export function redactInviteNetworkRequest(request: CapturedNetworkRequest): CapturedNetworkRequest {
+  return {
+    ...request,
+    name: redactInvitePaths(request.name),
+    requestHeaders: request.requestHeaders ? redactInvitePaths({ ...request.requestHeaders }) : request.requestHeaders,
+    requestBody: redactInvitePaths(request.requestBody),
+    responseHeaders: request.responseHeaders ? redactInvitePaths({ ...request.responseHeaders }) : request.responseHeaders,
+    responseBody: redactInvitePaths(request.responseBody),
+  }
+}
+
 export function PostHogProvider({ children }: { children: React.ReactNode }) {
   const pathname = usePathname()
 
@@ -51,6 +62,9 @@ export function PostHogProvider({ children }: { children: React.ReactNode }) {
         capture_pageleave: false,
         get_current_url: redactInviteUrl,
         before_send: redactInvitePathsBeforeSend,
+        session_recording: {
+          maskCapturedNetworkRequestFn: redactInviteNetworkRequest,
+        },
         // This must be part of initialization, not only the navigation effect
         // below, so an initially loaded invite page is protected before its DOM
         // can be considered for capture or recording.