fn create_key_holder()

in tough/src/editor/targets.rs [492:529]
34 lines of code
2 McCabe index (conditional complexity)

    fn create_key_holder(&self, keys: &[Box<dyn KeySource>]) -> Result<KeyHolder> {
        // There isn't a KeyHolder, so create one based on the provided keys
        let mut delegations = Delegations::new();
        // First create the tuf key pairs and keyids
        let mut keyids = Vec::new();
        let mut key_pairs = HashMap::new();
        for source in keys {
            let key_pair = source
                .as_sign()
                .context(error::KeyPairFromKeySourceSnafu)?
                .tuf_key();
            key_pairs.insert(
                key_pair
                    .key_id()
                    .context(error::JsonSerializationSnafu {})?
                    .clone(),
                key_pair.clone(),
            );
            keyids.push(
                key_pair
                    .key_id()
                    .context(error::JsonSerializationSnafu {})?
                    .clone(),
            );
        }
        // Then add the keys to the new delegations keys
        delegations.keys = key_pairs;
        // Now create a DelegatedRole for the new role
        delegations.roles.push(DelegatedRole {
            name: self.name.clone(),
            threshold: NonZeroU64::new(1).unwrap(),
            paths: PathSet::Paths([].to_vec()),
            terminating: false,
            keyids,
            targets: None,
        });
        Ok(KeyHolder::Delegations(delegations))
    }