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use openssl::{pkey::PKey, rsa::Rsa};
use std::io::{Error, ErrorKind};

pub struct Keypair {
  pub private_key: String,
  pub public_key: String,
}

/// Generate the asymmetric keypair for ActivityPub HTTP signatures.
pub fn generate_actor_keypair() -> Result<Keypair, Error> {
  let rsa = Rsa::generate(2048)?;
  let pkey = PKey::from_rsa(rsa)?;
  let public_key = pkey.public_key_to_pem()?;
  let private_key = pkey.private_key_to_pem_pkcs8()?;
  let key_to_string = |key| match String::from_utf8(key) {
    Ok(s) => Ok(s),
    Err(e) => Err(Error::new(
      ErrorKind::Other,
      format!("Failed converting key to string: {}", e),
    )),
  };
  Ok(Keypair {
    private_key: key_to_string(private_key)?,
    public_key: key_to_string(public_key)?,
  })
}