Lookup a secret value in the secret service.
The attributes should be a set of key and value string pairs.
If service is null, then secret.service.Service.getSync will be called to get the default classService proxy.
This method may block indefinitely and should not be used in user interface threads.
the schema for the attributes
the attribute keys and values
optional cancellation object
a newly allocated structValue, which should be released with secret.value.Value.unref, or null if no secret found
Lookup a secret value in the secret service.
The attributes should be a set of key and value string pairs.
If service is null, then secret.service.Service.getSync will be called to get the default classService proxy.
This method may block indefinitely and should not be used in user interface threads.