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actions: Add a decorator for marking superuser actions

Sunil Mohan Adapa requested to merge sunilmohan/freedombox:privileged-decorator into master

Any privileged action (a method) can be marked as such with the new decorator. A call to the method will be serialized into a sudo call (or later into a D-Bus call). The method arguments are turned to JSON and method is called as superuser. Arguments are de-serialized and are verified for type before the actual call as superuser. Return values are serialized and returned where they are de-serialized. Exceptions are also serialized and de-serialized.

The method must have be strictly typed and should not have keyword-only arguments. Currently supported types are int, float, str, dict/Dict, list/List and Optional.

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org

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