fix: revert cookie expiration to maintain backward compatibility

To ensure backward compatibility, we need to retain the previous cookie expiration time.
This prevents issues when some parts of the application are running an older version of the agent,
allowing for a gradual update to the latest version without breaking functionality.

packages/web/src/session/constants.ts

@@ -19,4 +19,5 @@ export const SESSION_ID_LENGTH = 32
 export const SESSION_DURATION_SECONDS = 4 * 60 * 60 // 4 hours
 export const SESSION_DURATION_MS = SESSION_DURATION_SECONDS * 1000
 export const SESSION_INACTIVITY_TIMEOUT_MS = 15 * 60 * 1000 // 15 minutes
+export const SESSION_INACTIVITY_TIMEOUT_SECONDS = SESSION_INACTIVITY_TIMEOUT_MS / 1000
 export const SESSION_STORAGE_KEY = '_splunk_rum_sid'

packages/web/src/session/cookie-session.ts

@@ -17,7 +17,7 @@
  */
 import { isIframe } from '../utils'
 import { SessionState } from './types'
-import { SESSION_DURATION_SECONDS, SESSION_STORAGE_KEY } from './constants'
+import { SESSION_INACTIVITY_TIMEOUT_SECONDS, SESSION_STORAGE_KEY } from './constants'
 import { isSessionDurationExceeded, isSessionInactivityTimeoutReached, isSessionState } from './utils'
 import { throttle } from '../utils/throttle'
 
@@ -91,7 +91,8 @@ export function renewCookieTimeout(
 
 	const cookieValue = encodeURIComponent(JSON.stringify(sessionState))
 	const domain = cookieDomain ? `domain=${cookieDomain};` : ''
-	let cookie = SESSION_STORAGE_KEY + '=' + cookieValue + '; path=/;' + domain + 'max-age=' + SESSION_DURATION_SECONDS
+	let cookie =
+		SESSION_STORAGE_KEY + '=' + cookieValue + '; path=/;' + domain + 'max-age=' + SESSION_INACTIVITY_TIMEOUT_SECONDS
 
 	if (isIframe()) {
 		cookie += ';SameSite=None; Secure'