How to identify if a user is being impersonated in Symfony2?

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In an application built with Symfony2 we want superadmins to be able to impersonate other users. This is easily done by giving the superadmin user the ROLE_ALLOWED_TO_SWITCH role. The switching is implemented with a call to "somewhere?_switch_user=" as suggesed in the reference documentation.

The problem however, is to detect in a template if the current user is actually impersonated so as to print a link to "somewhere?_switch_user=_exit" on the page, thus enabling the impersonating user to return to her real user.

symfony impersonation
4 Answers

If you need to test role from the previous admin user :

Working on Symfony 3.4

{% if is_granted('ROLE_PREVIOUS_ADMIN') %}
    {% for role in app.token.roles %}
        {% if role.role == 'ROLE_PREVIOUS_ADMIN' %}
            {% for role_from_previous in role.source.roles if role_from_previous.role == "ROLE_DELETE" %}
                {{ role.source.user.username }} has "ROLE_DELETE"
            {% endfor %}
        {% endif %}
    {% endfor %}
{% endif %}
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