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/// API handlers, the ends of each filter chain
use log::debug;
use parking_lot::RwLockUpgradableReadGuard;
use serde_json;
use serde_json::json;
use std::convert::Infallible;
use warp::{http::Response, http::StatusCode, reply};
use blake2::{Blake2s, Digest};
use std::fs;
use gradecoin::schema::{AuthRequest, Block, Db, MetuId, NakedBlock, Transaction, User};
/// POST /register
/// Enables a student to introduce themselves to the system
/// Can fail
pub async fn authenticate_user(
request: AuthRequest,
db: Db,
) -> Result<impl warp::Reply, warp::Rejection> {
let given_id = request.student_id.clone();
if let Some(priv_student_id) = MetuId::new(request.student_id) {
let userlist = db.users.upgradable_read();
if userlist.contains_key(&given_id) {
let res = Response::builder()
.status(StatusCode::BAD_REQUEST)
.body("This user is already authenticated");
Ok(res)
} else {
let new_user = User {
user_id: priv_student_id,
public_key: request.public_key,
balance: 0,
};
let user_json = serde_json::to_string(&new_user).unwrap();
fs::write(format!("users/{}.guy", new_user.user_id), user_json).unwrap();
let mut userlist = RwLockUpgradableReadGuard::upgrade(userlist);
userlist.insert(given_id, new_user);
// TODO: signature of the public key, please <11-04-21, yigit> //
let res = Response::builder()
.status(StatusCode::CREATED)
.body("Ready to use Gradecoin");
Ok(res)
}
} else {
let res = Response::builder()
.status(StatusCode::BAD_REQUEST)
.body("This user cannot have a gradecoin account");
Ok(res)
}
}
/// GET /transaction
/// Returns JSON array of transactions
/// Cannot fail
pub async fn list_transactions(db: Db) -> Result<impl warp::Reply, Infallible> {
debug!("list all transactions");
let mut result = Vec::new();
let transactions = db.pending_transactions.read();
// let transactions = transactions.clone().into_iter().collect();
for (_, value) in transactions.iter() {
result.push(value)
}
Ok(reply::with_status(reply::json(&result), StatusCode::OK))
}
/// GET /block
/// Returns JSON array of blocks
/// Cannot fail
/// Mostly around for debug purposes
pub async fn list_blocks(db: Db) -> Result<impl warp::Reply, Infallible> {
debug!("list all block");
let block = db.blockchain.read();
Ok(reply::with_status(reply::json(&*block), StatusCode::OK))
}
/// POST /transaction
/// Pushes a new transaction for pending transaction pool
/// Can reject the transaction proposal
/// TODO: when is a new transaction rejected <07-04-21, yigit> //
pub async fn propose_transaction(
new_transaction: Transaction,
db: Db,
) -> Result<impl warp::Reply, warp::Rejection> {
debug!("new transaction request {:?}", new_transaction);
// let mut transactions = db.lock().await;
let mut transactions = db.pending_transactions.write();
transactions.insert(new_transaction.source.to_owned(), new_transaction);
Ok(StatusCode::CREATED)
}
/// POST /block
/// Proposes a new block for the next round
/// Can reject the block
pub async fn propose_block(new_block: Block, db: Db) -> Result<impl warp::Reply, warp::Rejection> {
debug!("new block request {:?}", new_block);
// https://blog.logrocket.com/create-an-async-crud-web-service-in-rust-with-warp/ (this has
// error.rs, error struct, looks very clean)
let pending_transactions = db.pending_transactions.upgradable_read();
let blockchain = db.blockchain.upgradable_read();
// check 1, new_block.transaction_list from pending_transactions pool? <07-04-21, yigit> //
for transaction_hash in new_block.transaction_list.iter() {
if !pending_transactions.contains_key(transaction_hash) {
return Ok(StatusCode::BAD_REQUEST);
}
}
let naked_block = NakedBlock {
transaction_list: new_block.transaction_list.clone(),
nonce: new_block.nonce.clone(),
timestamp: new_block.timestamp.clone(),
};
let naked_block_flat = serde_json::to_vec(&naked_block).unwrap();
let hashvalue = Blake2s::digest(&naked_block_flat);
let hash_string = format!("{:x}", hashvalue);
// 6 rightmost bits are zero
let should_zero = hashvalue[31] as i32 + hashvalue[30] as i32 + hashvalue[29] as i32;
if should_zero == 0 {
// one last check to see if block is telling the truth
if hash_string == new_block.hash {
let mut blockchain = RwLockUpgradableReadGuard::upgrade(blockchain);
let block_json = serde_json::to_string(&new_block).unwrap();
fs::write(
format!("blocks/{}.block", new_block.timestamp.timestamp()),
block_json,
)
.unwrap();
*blockchain = new_block;
let mut pending_transactions = RwLockUpgradableReadGuard::upgrade(pending_transactions);
pending_transactions.clear();
Ok(StatusCode::CREATED)
} else {
Ok(StatusCode::BAD_REQUEST)
}
} else {
// reject
Ok(StatusCode::BAD_REQUEST)
}
}
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