# module_args · FT4 Rell API · Chromia Docs (concept)

> configuration used by the auth module, as defined in the chromia.yml file struct module_ args {
 evm_ signatures_ authorized_ operations: gtv? = null;
 aut

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.auth/module_args/

STRUCT

# module\_args

configuration used by the auth module, as defined in the `chromia.yml` file

```signature
struct module_args {
 evm_signatures_authorized_operations: gtv? = null;
 auth_op_blacklisted_operations: gtv? = null;
}
```

`evm_signatures_authorized_operations: gtv? = null;`
:   List of operations which require the `evm_signatures` operation.
    Generally, these operations will have a call to `verify_signers` inside.

    Standard FT4 operations which require `evm_signatures` do not need to be added here.

    If a transaction contains `evm_signatures`, but this operation is not used to
    authorize an operation in this list, the transaction will fail. This prevents users
    from adding a lot of signatures to make the transaction arbitrarily heavy.

    Defined in the `chromia.yml` file as:

    Plain text

    ```
      evm_signatures_authorized_operations:
        - op_1
        - op_2
    ```

    The value of this field will be
    `["op_1", "op_2"].to_gtv()`

    When parsing it, it will be converted to `set<text>`, which means duplicate entries
    will make the parsing fail

`auth_op_blacklisted_operations: gtv? = null;`
:   List of operations which should never follow an auth operation.
    Generally, any operations which does not call `authenticate` and does not prevent the
    users from repeatedly calling by rate limiting them should be included here.

    Standard operations which cannot be used with an auth operation do not need to be added
    here.

    Defined in the `chromia.yml` file as:

    Plain text

    ```
      evm_signatures_authorized_operations:
        - op_1
        - op_2
    ```

    The value of this field will be
    `["op_1", "op_2"].to_gtv()`

    When parsing it, it will be converted to `set<text>`, which means duplicate entries
    will make the parsing fail

    **See Also**

    * [is\_auth\_op](https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.auth/is_auth_op/) — for information on built-in auth operation

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/module.rell#lines-14)

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.auth/module_args/index.html)Generated API reference, mirrored from the live docs