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<title>Credentials Handling</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="idp5205440"></a>Credentials Handling</h2></div></div></div>
<p>
        For accessing a service, the application typically needs to
        present credentials. The application can request the
        credentials via GOA. First the application should invoke the
        <a class="link" href="gdbus-org.gnome.OnlineAccounts.Account.html#gdbus-method-org-gnome-OnlineAccounts-Account.EnsureCredentials" title="The EnsureCredentials() method">Account.EnsureCredentials()</a>
        method on the account object. If this succeeds, the
        application can request the credentials using e.g.  <a class="link" href="gdbus-org.gnome.OnlineAccounts.OAuthBased.html#gdbus-method-org-gnome-OnlineAccounts-OAuthBased.GetAccessToken" title="The GetAccessToken() method">OAuthBased.GetAccessToken()</a>
        or <a class="link" href="gdbus-org.gnome.OnlineAccounts.OAuth2Based.html#gdbus-method-org-gnome-OnlineAccounts-OAuth2Based.GetAccessToken" title="The GetAccessToken() method">OAuth2Based.GetAccessToken()</a>
        depending on what kind of credentials the account is using.
        If the service returns an authorization error (say, the access
        token expired), the application should call <a class="link" href="gdbus-org.gnome.OnlineAccounts.Account.html#gdbus-method-org-gnome-OnlineAccounts-Account.EnsureCredentials" title="The EnsureCredentials() method">Account.EnsureCredentials()</a>
        again to e.g. renew the credentials.
      </p>
<p>
        On the other hand, if <a class="link" href="gdbus-org.gnome.OnlineAccounts.Account.html#gdbus-method-org-gnome-OnlineAccounts-Account.EnsureCredentials" title="The EnsureCredentials() method">Account.EnsureCredentials()</a>
        ever fails, then the user will get notified that there is a
        problem with the account so he can take actions to fix it.
        Applications can listen to changes on the <a class="link" href="gdbus-org.gnome.OnlineAccounts.Account.html#gdbus-property-org-gnome-OnlineAccounts-Account.AttentionNeeded" title='The "AttentionNeeded" property'>Account.AttentionNeeded</a>
        property to get notified when it's time to try accessing the
        account again.
      </p>
<p>
        Note that the implementation for a provider may switch from
        e.g. OAuth to OAuth2 in a newer release of GNOME Online
        Accounts. Therefore, applications must never assume that the
        <a class="link" href="GoaObject.html" title="GoaObject"><span class="type">GoaObject</span></a> for an account implements a fixed set of
        interfaces.
      </p>
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