PLT-6492 Use new cookie to determine if user is logged in (#6317)

* Use new cookie to determine if user is logged in

* Add temporary code for 3.9 to prevent forced re-login

api/context.go

@@ -185,6 +185,20 @@ func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	// TEMPORARY CODE FOR 3.9, REMOVE FOR 3.10
+	if cookie, err := r.Cookie(model.SESSION_COOKIE_TOKEN); err == nil && c.Session.UserId != "" {
+		if _, err = r.Cookie(model.SESSION_COOKIE_USER); err != nil {
+			http.SetCookie(w, &http.Cookie{
+				Name:    model.SESSION_COOKIE_USER,
+				Value:   c.Session.UserId,
+				Path:    "/",
+				MaxAge:  cookie.MaxAge,
+				Expires: cookie.Expires,
+				Secure:  cookie.Secure,
+			})
+		}
+	}
+
 	if h.isApi || h.isTeamIndependent {
 		c.setTeamURL(c.GetSiteURLHeader(), false)
 		c.Path = r.URL.Path
@@ -357,7 +371,15 @@ func (c *Context) RemoveSessionCookie(w http.ResponseWriter, r *http.Request) {
 		HttpOnly: true,
 	}
 
+	userCookie := &http.Cookie{
+		Name:   model.SESSION_COOKIE_USER,
+		Value:  "",
+		Path:   "/",
+		MaxAge: -1,
+	}
+
 	http.SetCookie(w, cookie)
+	http.SetCookie(w, userCookie)
 }
 
 func (c *Context) SetInvalidParam(where string, name string) {