made-core 0.8.0

Domain core of MADE: entities, value objects, events, ports. No IO.
Documentation 
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use sha2::{Digest, Sha256};

use crate::error::DomainError;

use super::{CeremonyId, ChildGroupId, ChildPosition};

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ChildCeremonyId(CeremonyId);

impl ChildCeremonyId {
    pub fn derive(group_id: &ChildGroupId, position: ChildPosition) -> Result<Self, DomainError> {
        let mut digest = Sha256::new();
        digest.update(b"made.child-ceremony.v1\0");
        for part in [group_id.as_str().to_owned(), position.get().to_string()] {
            digest.update((part.len() as u64).to_be_bytes());
            digest.update(part.as_bytes());
        }
        CeremonyId::new(format!("child-{:x}", digest.finalize())).map(Self)
    }
    #[must_use]
    pub fn as_ceremony_id(&self) -> &CeremonyId {
        &self.0
    }
    #[must_use]
    pub fn into_ceremony_id(self) -> CeremonyId {
        self.0
    }
}