microledger 0.1.1

Microledger is an authentic data provider leveraging the concept of data provenance log. Provenance logs are intended to be a generalized form of a linked list data structure that uses cryptographic primitives to ensure integrity with a strong cryptographic link to a controller of the log.
Documentation 
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use ::microledger::microledger::MicroLedger;
use keri::{
    derivation::{basic::Basic, self_signing::SelfSigning},
    keys::{PrivateKey, PublicKey},
};
use microledger::{
    controlling_identifier::ControllingIdentifier,
    error::Error,
    seal_bundle::{SealBundle, SealData},
    signature::Signature,
    Serialization,
};
use rand::rngs::OsRng;

fn generate_key_pair() -> (PublicKey, PrivateKey) {
    let kp = ed25519_dalek::Keypair::generate(&mut OsRng {});
    let (vk, sk) = (kp.public, kp.secret);
    let vk = PublicKey::new(vk.to_bytes().to_vec());
    let sk = PrivateKey::new(sk.to_bytes().to_vec());
    (vk, sk)
}

#[test]
fn test() -> Result<(), Error> {
    let mut microledger = MicroLedger::new();
    let (pk, sk) = generate_key_pair();

    let payload = "some message";
    let bp = ControllingIdentifier::Basic(Basic::Ed25519.derive(pk));

    let seal_bundle = SealBundle::new().attach(SealData::AttachedData(payload.to_string()));

    let block = microledger.pre_anchor_block(vec![bp], &seal_bundle);

    // Sign block, attach signature and seal provider.
    let signature_raw = sk.sign_ed(&block.serialize()).unwrap();
    let s = Signature::SelfSigning(SelfSigning::Ed25519Sha512.derive(signature_raw));
    let signed_block = block.to_signed_block(vec![s], &seal_bundle);

    // Attach block to microledger.
    microledger = microledger.anchor(signed_block)?;
    assert_eq!(1, microledger.blocks.len());

    // Prepeare data for new block.
    let payload = "another message";
    let (npk, _nsk) = generate_key_pair();
    let nbp = ControllingIdentifier::Basic(Basic::Ed25519.derive(npk));

    let seal_bundle = SealBundle::new().attach(SealData::AttachedData(payload.to_string()));

    let block0 = microledger.pre_anchor_block(vec![nbp.clone()], &seal_bundle);

    // try to append block with wrong signature
    let (_wrong_pk, wrong_sk) = generate_key_pair();
    let signature_raw = wrong_sk.sign_ed(&block0.serialize()).unwrap();
    let s = Signature::SelfSigning(SelfSigning::Ed25519Sha512.derive(signature_raw));

    let signed_block0 = block0.to_signed_block(vec![s], &seal_bundle);
    let result = microledger.anchor(signed_block0);
    assert!(result.is_err());
    assert_eq!(1, microledger.blocks.len());

    // Now sign block the same block with proper keys and append it.
    let block1 = microledger.pre_anchor_block(vec![nbp], &seal_bundle);

    let signature_raw = sk.sign_ed(&block1.serialize()).unwrap();
    let s = Signature::SelfSigning(SelfSigning::Ed25519Sha512.derive(signature_raw));
    let signed_block1 = block1.to_signed_block(vec![s], &seal_bundle);
    let microledger0 = microledger.anchor(signed_block1)?;

    assert_eq!(2, microledger0.blocks.len());
    assert_eq!(1, microledger.blocks.len());

    // Try to add concurent block.
    let payload = "one more message";
    let (nnpk, nnsk) = generate_key_pair();
    let nnbp = ControllingIdentifier::Basic(Basic::Ed25519.derive(nnpk));

    let seal_bundle = SealBundle::new().attach(SealData::AttachedData(payload.to_string()));

    let block2 = microledger.pre_anchor_block(vec![nnbp], &seal_bundle);

    let signature_raw = sk.sign_ed(&block2.serialize()).unwrap();
    let s = Signature::SelfSigning(SelfSigning::Ed25519Sha512.derive(signature_raw));
    let signed_block2 = block2.to_signed_block(vec![s], &seal_bundle);
    let microledger1 = microledger.anchor(signed_block2)?;

    assert_eq!(2, microledger1.blocks.len());
    assert_eq!(1, microledger.blocks.len());

    let payload = "again, one more message";
    let (nnpk, _nnsk) = generate_key_pair();
    let nnbp = ControllingIdentifier::Basic(Basic::Ed25519.derive(nnpk));

    let seal_bundle = SealBundle::new().attach(SealData::AttachedData(payload.to_string()));

    let block3 = microledger1.pre_anchor_block(vec![nnbp], &seal_bundle);

    let signature_raw = nnsk.sign_ed(&block3.serialize()).unwrap();
    let s = Signature::SelfSigning(SelfSigning::Ed25519Sha512.derive(signature_raw));
    let signed_block2 = block3.to_signed_block(vec![s], &seal_bundle);
    let microledger2 = microledger1.anchor(signed_block2)?;

    assert_eq!(3, microledger2.blocks.len());
    assert_eq!(1, microledger.blocks.len());
    println!("{}", serde_json::to_string(&microledger2).unwrap());

    Ok(())
}