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/*!
Provides a set of simple helper functions to make ARNs for the IAM service.

These resource definitions ae take from the AWS
[documentation](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_identityandaccessmanagement.html#identityandaccessmanagement-resources-for-iam-policies).
With the exception  of the root account ARN described
[here](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_identifiers.html#identifiers-arns).
[*/

use crate::builder::{ArnBuilder, ResourceBuilder};
use crate::{ArnError, ARN};

// ------------------------------------------------------------------------------------------------
// Public Functions
// ------------------------------------------------------------------------------------------------

///
/// The service name portion of the ARN.
///
pub const SERVICE_NAME: &str = "iam";

///
/// `arn:aws:iam::123456789012:root`
///
pub fn root(account: &str) -> Result<ARN, ArnError> {
    ArnBuilder::new(SERVICE_NAME)
        .owned_by(account)
        .is(ResourceBuilder::new("root").build()?)
        .build()
}

///
/// `arn:${Partition}:iam::${Account}:user/${UserNameWithPath}`
///
pub fn user(partition: &str, account: &str, user_name: &str) -> Result<ARN, ArnError> {
    ArnBuilder::new(SERVICE_NAME)
        .in_partition(partition)
        .owned_by(account)
        .is(ResourceBuilder::new(user_name).is_an("user").build()?)
        .build()
}

///
/// `arn:${Partition}:iam::${Account}:role/${RoleNameWithPath}`
///
pub fn role(partition: &str, account: &str, role_name: &str) -> Result<ARN, ArnError> {
    ArnBuilder::new(SERVICE_NAME)
        .in_partition(partition)
        .owned_by(account)
        .is(ResourceBuilder::new(role_name).is_an("role").build()?)
        .build()
}

///
/// `arn:${Partition}:iam::${Account}:group/${GroupNameWithPath}`
///
pub fn group(partition: &str, account: &str, group_name: &str) -> Result<ARN, ArnError> {
    ArnBuilder::new(SERVICE_NAME)
        .in_partition(partition)
        .owned_by(account)
        .is(ResourceBuilder::new(group_name).is_an("group").build()?)
        .build()
}

///
/// `arn:${Partition}:iam::${Account}:policy/${PolicyNameWithPath}`
///
pub fn policy(partition: &str, account: &str, policy_name: &str) -> Result<ARN, ArnError> {
    ArnBuilder::new(SERVICE_NAME)
        .in_partition(partition)
        .owned_by(account)
        .is(ResourceBuilder::new(policy_name).is_an("policy").build()?)
        .build()
}