get user login working

.gitignore

@@ -1 +1,2 @@
 **/target
+**/.env

vtse-common/Cargo.toml

@@ -6,4 +6,5 @@ edition = "2018"
 
 [dependencies]
 serde = { version = "1", features = ["derive"] }
-thiserror = "1"
+thiserror = "1"
+uuid = { version = "0.8", features = ["serde", "v4"] }

vtse-common/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod net;
 pub mod operations;
 pub mod stock;
 

vtse-common/src/net.rs

@@ -0,0 +1,18 @@
+use serde::Serialize;
+use uuid::Uuid;
+
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum ServerResponse {
+    /// Generic success
+    Success,
+    NewApiKey(Uuid),
+    UserError(UserError),
+}
+
+#[derive(Serialize)]
+pub enum UserError {
+    InvalidPassword,
+    InvalidApiKey,
+    NotAuthorized,
+}

vtse-server/Cargo.toml

@@ -5,13 +5,18 @@ authors = ["Edward Shen <code@eddie.sh>"]
 edition = "2018"
 
 [dependencies]
-vtse-common = { path = "../vtse-common" }
-log = "0.4"
-simple_logger = "1.11"
-tokio = { version = "1", features = ["full"] }
-tokio-stream = { version = "0.1", features = ["net"] }
 anyhow = "1"
-uuid = { version = "0.8", features = ["v4"] }
+bytes = "1"
+dotenv = "0.15"
+log = "0.4"
+rand = "0.8"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-bytes = "1"
+simple_logger = "1.11"
+sodiumoxide = "0.2"
+sqlx = { version = "0.5", features = [ "runtime-tokio-rustls", "macros", "uuid", "postgres" ] }
+thiserror = "1"
+tokio = { version = "1", features = ["full"] }
+tokio-stream = { version = "0.1", features = ["net"] }
+uuid = { version = "0.8", features = ["v4"] }
+vtse-common = { path = "../vtse-common" }

vtse-server/src/main.rs

@@ -1,30 +1,47 @@
 use crate::operations::ServerOperation;
-use anyhow::anyhow;
+use anyhow::{bail, Result};
 use bytes::BytesMut;
-use log::{error, info};
-use tokio::io::AsyncReadExt;
+use log::{debug, error, info};
+use operations::{MarketOperation, QueryOperation, UserOperation};
+use sqlx::PgPool;
+use state::AppState;
+use std::env;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::net::{TcpListener, TcpStream};
 use tokio_stream::{wrappers::TcpListenerStream, StreamExt};
 
+mod market;
 mod operations;
-
-pub(crate) type Result<T> = std::result::Result<T, anyhow::Error>;
+mod state;
+mod user;
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    dotenv::dotenv().ok();
+    // If we can't successfully initialize our crypto library, fail immediately.
+    sodiumoxide::init().unwrap();
     simple_logger::SimpleLogger::default().init()?;
 
-    let mut listener_stream = TcpListener::bind("localhost:8080")
+    let mut listener_stream = TcpListener::bind(&env::var("BIND_ADDRESS")?)
         .await
         .map(TcpListenerStream::new)?;
 
-    info!("Successfully bound to port");
+    info!("Successfully bound to port.");
+
+    let db_pool = PgPool::connect(&env::var("DATABASE_URL")?).await?;
+
+    info!("Successfully established connection to database.");
 
     while let Some(Ok(stream)) = listener_stream.next().await {
+        // clone simply clones the arc reference, so this is cheap.
+        let db_pool = db_pool.clone();
         tokio::task::spawn(async {
-            match handle_stream(stream).await {
+            match handle_stream(stream, db_pool).await {
                 Ok(_) => (),
-                Err(e) => error!("{}", e),
+                Err(e) => {
+                    // stream.write_all(e);
+                    error!("{}", e);
+                }
             }
         });
     }
@@ -34,27 +51,44 @@ async fn main() -> Result<()> {
     Ok(())
 }
 
-async fn handle_stream(mut socket: TcpStream) -> Result<()> {
+async fn handle_stream(mut socket: TcpStream, pool: PgPool) -> Result<()> {
     // only accept data that can fit in 256 bytes
+    // the assumption is that a single request should always be within n bytes,
+    // otherwise there's a good chance that it's mal{formed,icious}.
     let mut buffer = BytesMut::with_capacity(256);
+    let mut state = AppState::new();
     loop {
         let bytes_read = socket.read_buf(&mut buffer).await?;
-        match bytes_read {
-            0 => return Err(anyhow!("Failed to read bytes, assuming socket is closed.")),
-            n => {
-                let data = buffer.split_to(n); // O(1)
-                let parsed = serde_json::from_slice::<ServerOperation>(&data)?;
-                match parsed {
-                    ServerOperation::Query(op) => {
-                        dbg!(op);
-                    }
-                    ServerOperation::Meta(op) => {
-                        dbg!(op);
-                    }
-                }
-                buffer.unsplit(data); // O(1)
-            }
+        if bytes_read == 0 {
+            bail!("Failed to read bytes, assuming socket is closed.")
         }
+        let data = buffer.split_to(bytes_read); // O(1)
+        let parsed = serde_json::from_slice::<ServerOperation>(&data)?;
+        debug!("Parsed operation: {:?}", parsed);
+        let response = match parsed {
+            ServerOperation::Query(op) => match op {
+                QueryOperation::StockInfo { stock } => todo!(),
+                QueryOperation::User(_) => todo!(),
+            },
+            ServerOperation::User(op) => match op {
+                UserOperation::Login { api_key } => state.login(api_key, &pool).await?,
+                UserOperation::Register { username, password } => {
+                    state.register(username, password, &pool).await?
+                }
+                UserOperation::GetKey { username, password } => {
+                    state.generate_api_key(username, password, &pool).await?
+                }
+            },
+            ServerOperation::Market(op) => match op {
+                MarketOperation::Buy(stock_name) => state.buy(stock_name)?,
+                MarketOperation::Sell(stock_name) => state.sell(stock_name)?,
+            },
+        };
+
+        socket
+            .write_all(serde_json::to_string(&response).unwrap().as_bytes())
+            .await?;
+        buffer.unsplit(data); // O(1)
         buffer.clear();
     }
 }

vtse-server/src/market/generator.rs

@@ -0,0 +1,37 @@
+use rand::rngs::ThreadRng;
+use rand::thread_rng;
+use rand::{distributions::Uniform, prelude::Distribution};
+
+#[derive(Copy, Clone, PartialEq, PartialOrd, Debug)]
+pub(crate) struct MarketModifier(f64);
+
+#[derive(Clone, Debug)]
+pub(crate) struct MarketGenerator {
+    rng: ThreadRng,
+    sample_range: Uniform<f64>,
+    volatility: f64,
+    old_price: MarketModifier,
+}
+
+impl MarketGenerator {
+    pub(crate) fn new(volatility: f64, initial_value: f64) -> Self {
+        Self {
+            rng: thread_rng(),
+            sample_range: Uniform::new_inclusive(-0.5, 0.5),
+            volatility,
+            old_price: MarketModifier(initial_value),
+        }
+    }
+}
+
+impl Iterator for MarketGenerator {
+    type Item = MarketModifier;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        // Algorithm from https://stackoverflow.com/a/8597889
+        let rng_multiplier = self.sample_range.sample(&mut self.rng);
+        let delta = 2f64 * self.volatility * rng_multiplier;
+        self.old_price.0 += self.old_price.0 * delta;
+        Some(self.old_price)
+    }
+}

vtse-server/src/market/mod.rs

@@ -0,0 +1 @@
+mod generator;

vtse-server/src/operations.rs

@@ -1,23 +1,43 @@
 use serde::Deserialize;
 use vtse_common::stock::StockName;
 
+use crate::user::{ApiKey, Password, Username};
+
 #[derive(Deserialize, Debug, PartialEq)]
 #[serde(untagged)]
 pub(crate) enum ServerOperation {
     Query(QueryOperation),
-    Meta(MetaOperation),
+    User(UserOperation),
+    Market(MarketOperation),
 }
 
 #[derive(Deserialize, Debug, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub(crate) enum QueryOperation {
     StockInfo { stock: StockName },
+    User(Username),
 }
 
 #[derive(Deserialize, Debug, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
-pub(crate) enum MetaOperation {
-    Register { username: String, password: String },
+pub(crate) enum UserOperation {
+    Login {
+        api_key: ApiKey,
+    },
+    Register {
+        username: Username,
+        password: Password,
+    },
+    GetKey {
+        username: Username,
+        password: Password,
+    },
+}
+
+#[derive(Deserialize, Debug, PartialEq)]
+pub(crate) enum MarketOperation {
+    Buy(StockName),
+    Sell(StockName),
 }
 
 #[cfg(test)]

vtse-server/src/state.rs

@@ -0,0 +1,167 @@
+use crate::user::{ApiKey, Password, Username};
+use sodiumoxide::crypto::pwhash::argon2id13::{pwhash_verify, HashedPassword};
+use sqlx::{query, PgPool};
+use thiserror::Error;
+use vtse_common::{
+    net::{ServerResponse, UserError},
+    stock::StockName,
+};
+
+#[derive(Error, Debug)]
+pub(crate) enum StateError {
+    #[error("Was not in the correct state")]
+    WrongState,
+    #[error("Got SQLx error: {0}`")]
+    Database(#[from] sqlx::Error),
+    #[error("Failed to hash password")]
+    PasswordHash,
+}
+
+type OperationResult = Result<ServerResponse, StateError>;
+
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
+pub(crate) enum AppState {
+    Unauthorized,
+    Authorized { user_id: i32 },
+}
+
+impl AppState {
+    pub(crate) fn new() -> Self {
+        Self::Unauthorized
+    }
+
+    fn assert_state(&self, expected_state: AppState) -> Result<(), StateError> {
+        if *self != expected_state {
+            Err(StateError::WrongState)
+        } else {
+            Ok(())
+        }
+    }
+}
+
+/// User operation implementation
+impl AppState {
+    pub(crate) async fn login(&mut self, api_key: ApiKey, pool: &PgPool) -> OperationResult {
+        self.assert_state(AppState::Unauthorized)?;
+        let user_id = {
+            let query = query!(
+                "SELECT (user_id) FROM user_api_keys
+                JOIN api_keys ON user_api_keys.key_id = api_keys.key_id
+                WHERE key = $1",
+                api_key.0
+            )
+            .fetch_optional(pool)
+            .await?;
+            match query {
+                Some(id) => id.user_id,
+                None => return Ok(ServerResponse::UserError(UserError::InvalidApiKey)),
+            }
+        };
+        *self = AppState::Authorized { user_id };
+        Ok(ServerResponse::Success)
+    }
+
+    pub(crate) async fn register(
+        &mut self,
+        username: Username,
+        password: Password,
+        pool: &PgPool,
+    ) -> OperationResult {
+        self.assert_state(AppState::Unauthorized)?;
+        query!(
+            "INSERT INTO users
+            (username, pwhash_data)
+            VALUES ($1::varchar, $2::bytea)",
+            username as Username,
+            password.salt().map_err(|_| StateError::PasswordHash)?.0,
+        )
+        .execute(pool)
+        .await?;
+        Ok(ServerResponse::Success)
+    }
+
+    pub(crate) async fn generate_api_key(
+        &self,
+        username: Username,
+        password: Password,
+        pool: &PgPool,
+    ) -> OperationResult {
+        self.assert_state(AppState::Unauthorized)?;
+        match self.validate_password(&username, &password, pool).await {
+            Ok(None) => Ok(ServerResponse::UserError(UserError::InvalidPassword)),
+            Ok(Some(user_id)) => self.create_api_key(user_id, pool).await,
+            Err(_) => todo!(),
+        }
+    }
+
+    async fn create_api_key(&self, user_id: i32, pool: &PgPool) -> OperationResult {
+        let mut transaction = pool.begin().await?;
+        let api_key = uuid::Uuid::new_v4();
+        let api_key_id = query!(
+            "INSERT INTO api_keys (key)
+            VALUES ($1)
+            RETURNING api_keys.key_id;",
+            &api_key,
+        )
+        .fetch_one(&mut transaction)
+        .await?
+        .key_id;
+
+        query!(
+            "INSERT INTO user_api_keys (user_id, key_id)
+            VALUES ($1, $2)",
+            user_id,
+            api_key_id
+        )
+        .execute(&mut transaction)
+        .await?;
+
+        transaction.commit().await?;
+
+        Ok(ServerResponse::NewApiKey(api_key))
+    }
+
+    async fn validate_password(
+        &self,
+        username: &Username,
+        password: &Password,
+        pool: &PgPool,
+    ) -> Result<Option<i32>, StateError> {
+        let result = query!(
+            "SELECT user_id, pwhash_data FROM users
+            WHERE username = $1::varchar",
+            username as &Username
+        )
+        .fetch_one(pool)
+        .await?;
+
+        let login_attempt = HashedPassword::from_slice(&result.pwhash_data)
+            .map(|pw| pwhash_verify(&pw, password.as_bytes()))
+            .unwrap();
+
+        if login_attempt {
+            Ok(Some(result.user_id))
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+/// Market operation implementation
+impl AppState {
+    pub(crate) fn buy(&self, stock_name: StockName) -> OperationResult {
+        // self.assert_state(AppState::Authorized)?;
+        todo!()
+    }
+
+    pub(crate) fn sell(&self, stock_name: StockName) -> OperationResult {
+        // self.assert_state(AppState::Authorized)?;
+        todo!()
+    }
+}
+
+impl Default for AppState {
+    fn default() -> Self {
+        Self::new()
+    }
+}

vtse-server/src/user.rs

@@ -1 +1,36 @@
-pub(crate) struct ApiKey(String);
+use serde::Deserialize;
+use sodiumoxide::crypto::pwhash::argon2id13::{pwhash, MEMLIMIT_INTERACTIVE, OPSLIMIT_INTERACTIVE};
+use uuid::Uuid;
+
+#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default, Deserialize, sqlx::Type)]
+#[sqlx(transparent)]
+pub(crate) struct ApiKey(pub(crate) Uuid);
+
+#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default, Deserialize, sqlx::Type)]
+#[sqlx(transparent)]
+pub(crate) struct Username(String);
+
+#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default, Deserialize)]
+pub(crate) struct Password(String);
+
+#[derive(sqlx::Type)]
+#[sqlx(transparent)]
+pub(crate) struct SaltedPasswordData(pub(crate) Vec<u8>);
+
+impl Password {
+    pub(crate) fn salt(self) -> Result<SaltedPasswordData, ()> {
+        Ok(SaltedPasswordData(
+            pwhash(
+                self.0.as_bytes(),
+                OPSLIMIT_INTERACTIVE,
+                MEMLIMIT_INTERACTIVE,
+            )?
+            .as_ref()
+            .to_vec(),
+        ))
+    }
+
+    pub(crate) fn as_bytes(&self) -> &[u8] {
+        self.0.as_bytes()
+    }
+}