use thiserror::Error;

#[derive(Debug, Error)]
pub enum PowError {
    #[error("pow hmac secret is not configured")]
    MissingSecret,
    #[error("unsupported pow algorithm: {0}")]
    UnsupportedAlgorithm(String),
    #[error("pow challenge expired")]
    Expired,
    #[error("invalid pow challenge signature")]
    InvalidSignature,
    #[error("invalid pow solution")]
    InvalidSolution,
    #[error("pow challenge was not issued or already used")]
    NotIssued,
    #[error("pow challenge was issued for a different client")]
    ClientMismatch,
    #[error("pow store error: {0}")]
    Storage(String),
    #[error("pow error: {0}")]
    Altcha(#[from] altcha::Error),
}