Contract Ownership

The following example implements access control to restrict functionality to a privileged user.

ABI

The interface contains a function to set the owner and a function that only the owner can use.

{{#include ../../code/examples/access-control/ownership/src/main.sw:abi}}

Identity

We must keep track of the owner in storage and compare them against the caller via msg_sender().

Initially there is no owner so we'll set them to None.

{{#include ../../code/examples/access-control/ownership/src/main.sw:identity}}

Implementation

To set the owner one of two conditions must be met:

• There is no owner
• The current owner is calling the function

To call our action() function the caller must be the owner of the contract.

{{#include ../../code/examples/access-control/ownership/src/main.sw:implementation}}