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//! Encoding, decoding, signing and verification ([Detached JWS](https://medium.com/gin-and-tonic/implementing-detached-json-web-signature-9ca5665ddcfc))
//!
//! Signing and verifying is done through the [`Sign`] and [`Verify`] traits.
//!
//! # Example with writer:
//! ```
//! use openssl::pkey::PKey;
//! use openssl::rsa::Rsa;
//! use openssl::{hash::MessageDigest};
//! use openssl::{
//!     rsa::Padding,
//!     sign::{Signer, Verifier},
//! };
//! use serde_json::{json, Map, Value};
//! use std::io::{Write};
//! use detached_jws::{SerializeJwsWriter, DeserializeJwsWriter};
//!
//! let keypair = PKey::from_rsa(Rsa::generate(2048).unwrap()).unwrap();
//!
//! let mut signer = Signer::new(MessageDigest::sha256(), &keypair).unwrap();
//! signer.set_rsa_padding(Padding::PKCS1_PSS).unwrap();
//!
//! let mut header = Map::new();
//! header.insert("custom".to_owned(), json!("custom_value"));
//!
//! let mut writer = SerializeJwsWriter::new(Vec::new(),
//!        "PS256".to_owned(),
//!        header,
//!        signer).unwrap();
//! writer.write_all(&[0, 1, 2, 3]);
//! writer.write_all(&[4, 5, 6]);
//!
//! let jws = writer.finish().unwrap();
//!
//! let mut verifier = Verifier::new(MessageDigest::sha256(), &keypair).unwrap();
//! verifier.set_rsa_padding(Padding::PKCS1_PSS).unwrap();
//!
//! let mut writer = DeserializeJwsWriter::new(&jws,
//!     |h| Some(verifier)
//! ).unwrap();
//! writer.write_all(&[0, 1, 2, 3]);
//! writer.write_all(&[4, 5, 6]);
//!
//! let verified_headers = writer.finish().unwrap();
//!
//! assert_eq!(
//!     verified_headers.get("custom").unwrap().as_str().unwrap(),
//!     "custom_value"
//! );
//! ```
//!
//! # Simple example:
//! ```
//! use openssl::pkey::PKey;
//! use openssl::rsa::Rsa;
//! use openssl::{hash::MessageDigest};
//! use openssl::{
//!     rsa::Padding,
//!     sign::{Signer, Verifier},
//! };
//! use serde_json::{json, Map, Value};
//!
//! let keypair = PKey::from_rsa(Rsa::generate(2048).unwrap()).unwrap();
//!
//! let mut signer = Signer::new(MessageDigest::sha256(), &keypair).unwrap();
//! signer.set_rsa_padding(Padding::PKCS1_PSS).unwrap();
//!
//! let mut header = Map::new();
//! header.insert("custom".to_owned(), json!("custom_value"));
//!
//! let payload = vec![0, 1, 2, 3, 4, 5, 6];
//!
//! let jws = detached_jws::serialize(
//!     "PS256".to_owned(),
//!     header,
//!     &mut payload.as_slice(),
//!     signer,
//! )
//! .unwrap();
//!
//! let mut verifier = Verifier::new(MessageDigest::sha256(), &keypair).unwrap();
//! verifier.set_rsa_padding(Padding::PKCS1_PSS).unwrap();
//!
//! let verified_headers =
//!     detached_jws::deserialize(&jws, &mut payload.as_slice(), verifier).unwrap();
//!
//! assert_eq!(
//!     verified_headers.get("custom").unwrap().as_str().unwrap(),
//!     "custom_value"
//! );
//! ```
pub mod decode;
pub mod encode;

pub mod openssl;

use anyhow::Result;
use serde_json::{value::Value, Map};
use std::io::Read;
use std::io::Write;

pub use crate::decode::{deserialize, deserialize_selector, DeserializeJwsWriter};
pub use crate::encode::{serialize, SerializeJwsWriter};

pub type JwsHeader = Map<String, Value>;

/// A signature signer
pub trait Sign: Write {
    fn get_sign(&self) -> Result<Vec<u8>>;

    fn form_detached_jws(
        self,
        algorithm: String,
        header: JwsHeader,
        payload: &mut impl Read,
    ) -> Result<Vec<u8>>
    where
        Self: Sized,
    {
        serialize(algorithm, header, payload, self)
    }
}

/// A signature verifier
pub trait Verify: Write {
    fn verify(&self, signature: &[u8]) -> Result<bool>;

    fn verify_jws_detached(
        self,
        jws: &impl AsRef<[u8]>,
        payload: &mut impl Read,
    ) -> Result<JwsHeader>
    where
        Self: Sized,
    {
        deserialize(jws, payload, self)
    }
}