contract_authz_example.rs

contract_authz_example.rs

// use protobuf
use cosmos_sdk_proto::{
    cosmos::feegrant::v1beta1::{BasicAllowance, MsgGrantAllowance},
    traits::{MessageExt, TypeUrl},
};

// example code Exec

    #[msg(exec)]
    fn authz_exec(&self, ctx: ExecCtx, grantee: String) -> Result<Response, Self::Error> {
        deps.api.addr_validate(&grantee)?;

        let feegrant_msg = MsgGrantAllowance {
            granter: env.contract.address.to_string(),
            grantee,
            allowance: Some(
                BasicAllowance {
                    // There is no spending limit for this grantee
                    spend_limit: vec![],
                    expiration: None,
                }
                .to_any()?,
            ),
        }
        .to_any()?;

        let msg = CosmosMsg::Stargate {
            type_url: feegrant_msg.type_url,
            value: feegrant_msg.value.into(),
        };
        Response::new().add_message(msg);
    }