diff --git a/.gitignore b/.gitignore index 53eaa21960..7fd7f19fc0 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,6 @@ -/target +/targetString **/*.rs.bk +/*/target +/test_inbox +.idea +target \ No newline at end of file diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 0000000000..9538a44b66 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,13 @@ +# nym-sfw-provider Changelog + +## 0.2.0 + +* removed the `--local` flag +* introduced `--directory` argument to support arbitrary directory servers. Leaving it out will point the node at the "https://directory.nymtech.net" alpha testnet server +* IPv6 support +* provider version number is now shown at node start +* directory server location is now shown at node start + +## 0.1.0 - Initial Release + +* The bare minimum set of features required by a Nym Store and Forward Provider diff --git a/Cargo.lock b/Cargo.lock index ba7dfe02dc..40004f9c75 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,5 +1,10 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. +[[package]] +name = "adler32" +version = "1.0.4" +source = "registry+https://github.com/rust-lang/crates.io-index" + [[package]] name = "aes-ctr" version = "0.3.0" @@ -31,6 +36,22 @@ dependencies = [ "stream-cipher 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "aho-corasick" +version = "0.7.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "memchr 2.2.1 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"registry+https://github.com/rust-lang/crates.io-index" + [[package]] name = "bitflags" version = "1.2.1" @@ -57,6 +130,16 @@ dependencies = [ "opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "blake2b_simd" +version = "0.5.9" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)", + "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)", + "constant_time_eq 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)", +] + [[package]] name = "block-buffer" version = "0.7.3" @@ -84,6 +167,17 @@ dependencies = [ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "built" +version = "0.3.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "chrono 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)", + "git2 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)", + "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)", + "toml 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)", +] + [[package]] name = "byte-tools" version = "0.3.1" @@ -96,7 +190,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index" [[package]] name = "bytes" -version = "0.5.2" +version = "0.4.12" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)", + "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)", + "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "bytes" +version = "0.5.3" source = "registry+https://github.com/rust-lang/crates.io-index" [[package]] @@ -109,8 +213,12 @@ dependencies = [ [[package]] name = "cc" -version = "1.0.47" +version = "1.0.48" source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "jobserver 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)", + "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)", +] [[package]] name = "cfg-if" @@ -126,12 +234,36 @@ dependencies = [ "keystream 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "chrono" +version = "0.4.10" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "num-integer 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)", + "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)", + "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "clap" +version = "2.33.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)", + "atty 0.2.13 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type AuthToken = [u8; 32]; diff --git a/sfw-provider-requests/src/requests.rs b/sfw-provider-requests/src/requests.rs new file mode 100644 index 0000000000..3dba30c038 --- /dev/null +++ b/sfw-provider-requests/src/requests.rs @@ -0,0 +1,231 @@ +use crate::AuthToken; +use sphinx::route::DestinationAddressBytes; + +const PULL_REQUEST_MESSAGE_PREFIX: [u8; 2] = [1, 0]; +const REGISTER_MESSAGE_PREFIX: [u8; 2] = [0, 1]; + +// TODO: how to do it more nicely, considering all sfw-provider-requests implement same trait that is exercised here? +#[derive(Debug)] +pub enum ProviderRequests { + PullMessages(PullRequest), + Register(RegisterRequest), +} + +impl ProviderRequests { + pub fn to_bytes(&self) -> Vec { + use ProviderRequests::*; + match self { + PullMessages(pr) => pr.to_bytes(), + Register(pr) => pr.to_bytes(), + } + } + + pub fn from_bytes(bytes: &[u8]) -> Result { + use ProviderRequests::*; + if bytes.len() < 2 { + return Err(ProviderRequestError::UnmarshalError); + } + let mut received_prefix = [0; 2]; + received_prefix.copy_from_slice(&bytes[..2]); + match received_prefix { + PULL_REQUEST_MESSAGE_PREFIX => Ok(PullMessages(PullRequest::from_bytes(bytes)?)), + REGISTER_MESSAGE_PREFIX => Ok(Register(RegisterRequest::from_bytes(bytes)?)), + _ => Err(ProviderRequestError::UnmarshalErrorIncorrectPrefix), + } + } +} + +#[derive(Debug)] +pub enum ProviderRequestError { + MarshalError, + UnmarshalError, + UnmarshalErrorIncorrectPrefix, +} + +pub trait ProviderRequest +where + Self: Sized, +{ + fn get_prefix() -> [u8; 2]; + fn to_bytes(&self) -> Vec; + fn from_bytes(bytes: &[u8]) -> Result; +} + +#[derive(Debug)] +pub struct PullRequest { + // TODO: public keys, signatures, tokens, etc. basically some kind of authentication bs + pub auth_token: AuthToken, + pub destination_address: sphinx::route::DestinationAddressBytes, +} + +impl PullRequest { + pub fn new( + destination_address: sphinx::route::DestinationAddressBytes, + auth_token: AuthToken, + ) -> Self { + PullRequest { + auth_token, + destination_address, + } + } +} + +impl ProviderRequest for PullRequest { + fn get_prefix() -> [u8; 2] { + PULL_REQUEST_MESSAGE_PREFIX + } + + fn to_bytes(&self) -> Vec { + Self::get_prefix() + .to_vec() + .into_iter() + .chain(self.destination_address.iter().cloned()) + .chain(self.auth_token.iter().cloned()) + .collect() + } + + fn from_bytes(bytes: &[u8]) -> Result { + if bytes.len() != 2 + 32 + 32 { + return Err(ProviderRequestError::UnmarshalError); + } + + let mut received_prefix = [0u8; 2]; + received_prefix.copy_from_slice(&bytes[..2]); + if received_prefix != Self::get_prefix() { + return Err(ProviderRequestError::UnmarshalErrorIncorrectPrefix); + } + + let mut destination_address = [0u8; 32]; + destination_address.copy_from_slice(&bytes[2..34]); + + let mut auth_token = [0u8; 32]; + auth_token.copy_from_slice(&bytes[34..]); + + Ok(PullRequest { + auth_token, + destination_address, + }) + } +} + +#[derive(Debug)] +pub struct RegisterRequest { + pub destination_address: DestinationAddressBytes, +} + +impl RegisterRequest { + pub fn new(destination_address: DestinationAddressBytes) -> Self { + RegisterRequest { + destination_address, + } + } +} + +impl ProviderRequest for RegisterRequest { + fn get_prefix() -> [u8; 2] { + REGISTER_MESSAGE_PREFIX + } + + fn to_bytes(&self) -> Vec { + Self::get_prefix() + .to_vec() + .into_iter() + .chain(self.destination_address.iter().cloned()) + .collect() + } + + fn from_bytes(bytes: &[u8]) -> Result { + if bytes.len() != 2 + 32 { + return Err(ProviderRequestError::UnmarshalError); + } + + let mut received_prefix = [0u8; 2]; + received_prefix.copy_from_slice(&bytes[..2]); + if received_prefix != Self::get_prefix() { + return Err(ProviderRequestError::UnmarshalErrorIncorrectPrefix); + } + + let mut destination_address = [0u8; 32]; + destination_address.copy_from_slice(&bytes[2..]); + + Ok(RegisterRequest { + destination_address, + }) + } +} + +#[cfg(test)] +mod creating_pull_request { + use super::*; + + #[test] + fn it_is_possible_to_recover_it_from_bytes() { + let address = [ + 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 0, 1, 2, + ]; + let auth_token = [1u8; 32]; + let pull_request = PullRequest::new(address, auth_token); + let bytes = pull_request.to_bytes(); + + let recovered = PullRequest::from_bytes(&bytes).unwrap(); + assert_eq!(address, recovered.destination_address); + assert_eq!(auth_token, recovered.auth_token); + } + + #[test] + fn it_is_possible_to_recover_it_from_bytes_with_enum_wrapper() { + let address = [ + 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 0, 1, 2, + ]; + let auth_token = [1u8; 32]; + let pull_request = PullRequest::new(address, auth_token); + let bytes = pull_request.to_bytes(); + + let recovered = ProviderRequests::from_bytes(&bytes).unwrap(); + match recovered { + ProviderRequests::PullMessages(req) => { + assert_eq!(address, req.destination_address); + assert_eq!(auth_token, req.auth_token); + } + _ => panic!("expected to recover pull request!"), + } + } +} + +#[cfg(test)] +mod creating_register_request { + use super::*; + + #[test] + fn it_is_possible_to_recover_it_from_bytes() { + let address = [ + 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 0, 1, 2, + ]; + let register_request = RegisterRequest::new(address); + let bytes = register_request.to_bytes(); + + let recovered = RegisterRequest::from_bytes(&bytes).unwrap(); + assert_eq!(address, recovered.destination_address); + } + + #[test] + fn it_is_possible_to_recover_it_from_bytes_with_enum_wrapper() { + let address = [ + 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 0, 1, 2, + ]; + let register_request = RegisterRequest::new(address); + let bytes = register_request.to_bytes(); + + let recovered = ProviderRequests::from_bytes(&bytes).unwrap(); + match recovered { + ProviderRequests::Register(req) => { + assert_eq!(address, req.destination_address); + } + _ => panic!("expected to recover pull request!"), + } + } +} diff --git a/sfw-provider-requests/src/responses.rs b/sfw-provider-requests/src/responses.rs new file mode 100644 index 0000000000..870f527334 --- /dev/null +++ b/sfw-provider-requests/src/responses.rs @@ -0,0 +1,151 @@ +use crate::AuthToken; +use std::convert::TryInto; + +#[derive(Debug)] +pub enum ProviderResponseError { + MarshalError, + UnmarshalError, + UnmarshalErrorInvalidLength, +} + +pub trait ProviderResponse +where + Self: Sized, +{ + fn to_bytes(&self) -> Vec; + fn from_bytes(bytes: &[u8]) -> Result; +} + +#[derive(Debug)] +pub struct PullResponse { + pub messages: Vec>, +} + +#[derive(Debug)] +pub struct RegisterResponse { + pub auth_token: AuthToken, +} + +impl PullResponse { + pub fn new(messages: Vec>) -> Self { + PullResponse { messages } + } +} + +impl RegisterResponse { + pub fn new(auth_token: AuthToken) -> Self { + RegisterResponse { auth_token } + } +} + +// TODO: This should go into some kind of utils module/crate +fn read_be_u16(input: &mut &[u8]) -> u16 { + let (int_bytes, rest) = input.split_at(std::mem::size_of::()); + *input = rest; + u16::from_be_bytes(int_bytes.try_into().unwrap()) +} + +// TODO: currently this allows for maximum 64kB payload - if we go over that in sphinx, +// we need to update this code. +impl ProviderResponse for PullResponse { + // num_msgs || len1 || len2 || ... || msg1 || msg2 || ... + fn to_bytes(&self) -> Vec { + let num_msgs = self.messages.len() as u16; + let msgs_lens: Vec = self.messages.iter().map(|msg| msg.len() as u16).collect(); + + num_msgs + .to_be_bytes() + .to_vec() + .into_iter() + .chain( + msgs_lens + .into_iter() + .flat_map(|len| len.to_be_bytes().to_vec().into_iter()), + ) + .chain(self.messages.iter().flat_map(|msg| msg.clone().into_iter())) + .collect() + } + + fn from_bytes(bytes: &[u8]) -> Result { + // can we read number of messages? + if bytes.len() < 2 { + return Err(ProviderResponseError::UnmarshalErrorInvalidLength); + } + + let mut bytes_copy = bytes.clone(); + let num_msgs = read_be_u16(&mut bytes_copy); + + // can we read all lengths of messages? + if bytes_copy.len() < (num_msgs * 2) as usize { + return Err(ProviderResponseError::UnmarshalErrorInvalidLength); + } + + let msgs_lens: Vec<_> = (0..num_msgs) + .map(|_| read_be_u16(&mut bytes_copy)) + .collect(); + + let required_remaining_len = msgs_lens + .iter() + .fold(0usize, |acc, &len| acc + (len as usize)); + + // can we read messages themselves? + if bytes_copy.len() != required_remaining_len { + return Err(ProviderResponseError::UnmarshalErrorInvalidLength); + } + + let msgs = msgs_lens + .iter() + .scan(0usize, |i, &len| { + let j = *i + (len as usize); + let msg = bytes_copy[*i..j].to_vec(); + *i = j; + Some(msg) + }) + .collect(); + + Ok(PullResponse { messages: msgs }) + } +} + +impl ProviderResponse for RegisterResponse { + fn to_bytes(&self) -> Vec { + self.auth_token.to_vec() + } + + fn from_bytes(bytes: &[u8]) -> Result { + match bytes.len() { + 32 => { + let mut auth_token = [0u8; 32]; + auth_token.copy_from_slice(&bytes[..32]); + Ok(RegisterResponse { auth_token }) + } + _ => Err(ProviderResponseError::UnmarshalErrorInvalidLength), + } + } +} + +#[cfg(test)] +mod creating_pull_response { + use super::*; + + #[test] + fn it_is_possible_to_recover_it_from_bytes() { + let msg1 = vec![1, 2, 3, 4, 5]; + let msg2 = vec![]; + let msg3 = vec![ + 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, + 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, + 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, + 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, + 2, 3, 4, 5, 1, 2, 3, 4, 5, + ]; + let msg4 = vec![1, 2, 3, 4, 5, 6, 7]; + + let msgs = vec![msg1, msg2, msg3, msg4]; + let pull_response = PullResponse::new(msgs.clone()); + let bytes = pull_response.to_bytes(); + + let recovered = PullResponse::from_bytes(&bytes).unwrap(); + assert_eq!(msgs, recovered.messages); + } +} diff --git a/src/main.rs b/src/main.rs index c4ef9706d4..ce39e86615 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,41 +1,187 @@ -use tokio::net::TcpListener; -use tokio::prelude::*; -use sphinx::SphinxPacket; +use crate::provider::ServiceProvider; +use clap::{App, Arg, ArgMatches, SubCommand}; +use nym_client::identity::mixnet::KeyPair; +use std::net::ToSocketAddrs; +use std::path::PathBuf; +use std::process; -#[tokio::main] -async fn main() -> Result<(), Box> { - let my_address = "127.0.0.1:8081"; - let mut listener = TcpListener::bind(my_address).await?; +pub mod provider; - println!("Starting Nym store-and-forward Provider on address {:?}", my_address); - println!("Waiting for input..."); +fn main() { + let arg_matches = App::new("Nym Service Provider") + .version("0.1.0") + .author("Nymtech") + .about("Implementation of the Loopix-based Service Provider") + .subcommand( + SubCommand::with_name("run") + .about("Starts the service provider") + .arg( + Arg::with_name("mixHost") + .long("mixHost") + .help("The custom host on which the service provider will be running for receiving sphinx packets") + .takes_value(true), + ) + .arg( + Arg::with_name("mixPort") + .long("mixPort") + .help("The port on which the service provider will be listening for sphinx packets") + .takes_value(true) + ) + .arg( + Arg::with_name("clientHost") + .long("clientHost") + .help("The custom host on which the service provider will be running for receiving client sfw-provider-requests") + .takes_value(true), + ) + .arg( + Arg::with_name("clientPort") + .long("clientPort") + .help("The port on which the service provider will be listening for client sfw-provider-requests") + .takes_value(true) + ) + .arg( + Arg::with_name("storeDir") + .short("s") + .long("storeDir") + .help("Directory storing all packets for the clients") + .takes_value(true) + ) + .arg( + Arg::with_name("registeredLedger") + .short("r") + .long("registeredLedger") + .help("Directory of the ledger of registered clients") + .takes_value(true) + ) + .arg( + Arg::with_name("directory") + .long("directory") + .help("Address of the directory server the node is sending presence and metrics to") + .takes_value(true), + ), + ) + .get_matches(); - loop { - let (mut inbound, _) = listener.accept().await?; - - tokio::spawn(async move { - let mut buf = [0; 1024]; - - loop { - let _ = match inbound.read(&mut buf).await { - Ok(length) if length == 0 => - { - println!("Remote connection closed."); - return - } - Ok(_) => { - println!("Received a packet!"); - let packet = SphinxPacket::from_bytes(buf.to_vec()).unwrap(); - let (unwrapped_packet, _) = packet.process(Default::default()); - let message = unwrapped_packet.payload.content; - println!("Got message: {:?}", String::from_utf8(message).unwrap()); - } - Err(e) => { - println!("failed to read from socket; err = {:?}", e); - return; - } - }; - } - }); + if let Err(e) = execute(arg_matches) { + println!("{}", e); + process::exit(1); } } + +fn run(matches: &ArgMatches) { + let config = new_config(matches); + let provider = ServiceProvider::new(&config); + + provider.start().unwrap() +} + +fn new_config(matches: &ArgMatches) -> provider::Config { + println!("Running the service provider!"); + + let directory_server = matches + .value_of("directory") + .unwrap_or("https://directory.nymtech.net") + .to_string(); + + let mix_host = matches.value_of("mixHost").unwrap(); + let mix_port = match matches.value_of("mixPort").unwrap_or("8085").parse::() { + Ok(n) => n, + Err(err) => panic!("Invalid mix host port value provided - {:?}", err), + }; + + let client_host = matches.value_of("clientHost").unwrap(); + let client_port = match matches + .value_of("clientPort") + .unwrap_or("9000") + .parse::() + { + Ok(n) => n, + Err(err) => panic!("Invalid client port value provided - {:?}", err), + }; + + let key_pair = KeyPair::new(); // TODO: persist this so keypairs don't change every restart + let store_dir = PathBuf::from( + matches + .value_of("storeDir") + .unwrap_or("/tmp/nym-provider/inboxes"), + ); + let registered_client_ledger_dir = PathBuf::from( + matches + .value_of("registeredLedger") + .unwrap_or("/tmp/nym-provider/registered_clients"), + ); + + println!("The value of mix_host is: {:?}", mix_host); + println!("The value of mix_port is: {:?}", mix_port); + println!("The value of client_host is: {:?}", client_host); + println!("The value of client_port is: {:?}", client_port); + println!("The value of key is: {:?}", key_pair.private.clone()); + println!("The value of store_dir is: {:?}", store_dir); + println!( + "The value of registered_client_ledger_dir is: {:?}", + registered_client_ledger_dir + ); + + let mix_socket_address = (mix_host, mix_port) + .to_socket_addrs() + .expect("Failed to combine host and port") + .next() + .expect("Failed to extract the socket address from the iterator"); + + let client_socket_address = (client_host, client_port) + .to_socket_addrs() + .expect("Failed to combine host and port") + .next() + .expect("Failed to extract the socket address from the iterator"); + + println!( + "The full combined mix socket address is {}", + mix_socket_address + ); + println!( + "The full combined client socket address is {}", + client_socket_address + ); + + provider::Config { + mix_socket_address, + directory_server, + public_key: key_pair.public, + client_socket_address, + secret_key: key_pair.private, + store_dir: PathBuf::from(store_dir), + } +} + +pub mod built_info { + // The file has been placed there by the build script. + include!(concat!(env!("OUT_DIR"), "/built.rs")); +} + +fn execute(matches: ArgMatches) -> Result<(), String> { + match matches.subcommand() { + ("run", Some(m)) => Ok(run(m)), + _ => Err(usage()), + } +} + +fn usage() -> String { + banner() + "usage: --help to see available options.\n\n" +} + +fn banner() -> String { + format!( + r#" + + _ __ _ _ _ __ ___ + | '_ \| | | | '_ \ _ \ + | | | | |_| | | | | | | + |_| |_|\__, |_| |_| |_| + |___/ + + (store-and-forward provider - version {:}) + + "#, + built_info::PKG_VERSION + ) +} diff --git a/src/provider/client_handling/mod.rs b/src/provider/client_handling/mod.rs new file mode 100644 index 0000000000..d252fc3cc2 --- /dev/null +++ b/src/provider/client_handling/mod.rs @@ -0,0 +1,270 @@ +use crate::provider::storage::{ClientStorage, StoreError}; +use crate::provider::ClientLedger; +use curve25519_dalek::scalar::Scalar; +use futures::lock::Mutex as FMutex; +use hmac::{Hmac, Mac}; +use sfw_provider_requests::requests::{ + ProviderRequestError, ProviderRequests, PullRequest, RegisterRequest, +}; +use sfw_provider_requests::responses::{ProviderResponse, PullResponse, RegisterResponse}; +use sfw_provider_requests::AuthToken; +use sha2::Sha256; +use std::io; +use std::path::{Path, PathBuf}; +use std::sync::Arc; + +type HmacSha256 = Hmac; + +#[derive(Debug)] +pub enum ClientProcessingError { + ClientDoesntExistError, + StoreError, + InvalidRequest, + WrongToken, + IOError, +} + +impl From for ClientProcessingError { + fn from(_: ProviderRequestError) -> Self { + use ClientProcessingError::*; + + InvalidRequest + } +} + +impl From for ClientProcessingError { + fn from(e: StoreError) -> Self { + match e { + StoreError::ClientDoesntExistError => ClientProcessingError::ClientDoesntExistError, + _ => ClientProcessingError::StoreError, + } + } +} + +impl From for ClientProcessingError { + fn from(_: io::Error) -> Self { + use ClientProcessingError::*; + + IOError + } +} + +#[derive(Debug)] +pub(crate) struct ClientProcessingData { + store_dir: PathBuf, + registered_clients_ledger: Arc>, + secret_key: Scalar, +} + +impl ClientProcessingData { + pub(crate) fn new( + store_dir: PathBuf, + registered_clients_ledger: Arc>, + secret_key: Scalar, + ) -> Self { + ClientProcessingData { + store_dir, + registered_clients_ledger, + secret_key, + } + } + + pub(crate) fn add_arc(self) -> Arc { + Arc::new(self) + } +} + +pub(crate) struct ClientRequestProcessor; + +impl ClientRequestProcessor { + pub(crate) async fn process_client_request( + data: &[u8], + processing_data: Arc, + ) -> Result, ClientProcessingError> { + let client_request = ProviderRequests::from_bytes(&data)?; + println!("Received the following request: {:?}", client_request); + match client_request { + ProviderRequests::Register(req) => Ok(ClientRequestProcessor::register_new_client( + req, + processing_data, + ) + .await? + .to_bytes()), + ProviderRequests::PullMessages(req) => Ok( + ClientRequestProcessor::process_pull_messages_request(req, processing_data) + .await? + .to_bytes(), + ), + } + } + + async fn process_pull_messages_request( + req: PullRequest, + processing_data: Arc, + ) -> Result { + // TODO: this lock is completely unnecessary as we're only reading the data. + // Wait for https://github.com/nymtech/nym-sfw-provider/issues/19 to resolve. + let unlocked_ledger = processing_data.registered_clients_ledger.lock().await; + + println!("Processing pull!"); + if unlocked_ledger.has_token(req.auth_token) { + // drop the mutex so that we could do IO without blocking others wanting to get the lock + drop(unlocked_ledger); + let retrieved_messages = ClientStorage::retrieve_client_files( + req.destination_address, + processing_data.store_dir.as_path(), + )?; + Ok(PullResponse::new(retrieved_messages)) + } else { + Err(ClientProcessingError::WrongToken) + } + } + + async fn register_new_client( + req: RegisterRequest, + processing_data: Arc, + ) -> Result { + println!("Processing register new client request!"); + let mut unlocked_ledger = processing_data.registered_clients_ledger.lock().await; + + let auth_token = ClientRequestProcessor::generate_new_auth_token( + req.destination_address.to_vec(), + processing_data.secret_key, + ); + if !unlocked_ledger.has_token(auth_token) { + unlocked_ledger.insert_token(auth_token, req.destination_address); + ClientRequestProcessor::create_storage_dir( + req.destination_address, + processing_data.store_dir.as_path(), + )?; + } + Ok(RegisterResponse::new(auth_token)) + } + + fn create_storage_dir( + client_address: sphinx::route::DestinationAddressBytes, + store_dir: &Path, + ) -> io::Result<()> { + let client_dir_name = hex::encode(client_address); + let full_store_dir = store_dir.join(client_dir_name); + std::fs::create_dir_all(full_store_dir) + } + + fn generate_new_auth_token(data: Vec, key: Scalar) -> AuthToken { + let mut auth_token_raw = + HmacSha256::new_varkey(&key.to_bytes()).expect("HMAC can take key of any size"); + auth_token_raw.input(&data); + let mut auth_token = [0u8; 32]; + auth_token.copy_from_slice(&auth_token_raw.result().code().to_vec()); + auth_token + } +} + +#[cfg(test)] +mod register_new_client { + // use super::*; + + // TODO: those tests require being called in async context. we need to research how to test this stuff... + // #[test] + // fn registers_new_auth_token_for_each_new_client() { + // let req1 = RegisterRequest { + // destination_address: [1u8; 32], + // }; + // let registered_client_ledger = ClientLedger::new(); + // let store_dir = PathBuf::from("./foo/"); + // let key = Scalar::from_bytes_mod_order([1u8; 32]); + // let client_processing_data = ClientProcessingData::new(store_dir, registered_client_ledger, key).add_arc_futures_mutex(); + // + // + // // need to do async.... + // client_processing_data.lock().await; + // assert_eq!(0, registered_client_ledger.0.len()); + // ClientRequestProcessor::register_new_client( + // req1, + // client_processing_data.clone(), + // ); + // + // assert_eq!(1, registered_client_ledger.0.len()); + // + // let req2 = RegisterRequest { + // destination_address: [2u8; 32], + // }; + // ClientRequestProcessor::register_new_client( + // req2, + // client_processing_data, + // ); + // assert_eq!(2, registered_client_ledger.0.len()); + // } + // + // #[test] + // fn registers_given_token_only_once() { + // let req1 = RegisterRequest { + // destination_address: [1u8; 32], + // }; + // let registered_client_ledger = ClientLedger::new(); + // let store_dir = PathBuf::from("./foo/"); + // let key = Scalar::from_bytes_mod_order([1u8; 32]); + // let client_processing_data = ClientProcessingData::new(store_dir, registered_client_ledger, key).add_arc_futures_mutex(); + // + // ClientRequestProcessor::register_new_client( + // req1, + // client_processing_data.clone(), + // ); + // let req2 = RegisterRequest { + // destination_address: [1u8; 32], + // }; + // ClientRequestProcessor::register_new_client( + // req2, + // client_processing_data.clone(), + // ); + // + // client_processing_data.lock().await; + // + // assert_eq!(1, registered_client_ledger.0.len()) + // } +} + +#[cfg(test)] +mod create_storage_dir { + use super::*; + use sphinx::route::DestinationAddressBytes; + + #[test] + fn it_creates_a_correct_storage_directory() { + let client_address: DestinationAddressBytes = [1u8; 32]; + let store_dir = Path::new("./foo/"); + ClientRequestProcessor::create_storage_dir(client_address, store_dir).unwrap(); + } +} + +#[cfg(test)] +mod generating_new_auth_token { + use super::*; + + #[test] + fn for_the_same_input_generates_the_same_auth_token() { + let data1 = vec![1u8; 55]; + let data2 = vec![1u8; 55]; + let key = Scalar::from_bytes_mod_order([1u8; 32]); + let token1 = ClientRequestProcessor::generate_new_auth_token(data1, key); + let token2 = ClientRequestProcessor::generate_new_auth_token(data2, key); + assert_eq!(token1, token2); + } + + #[test] + fn for_different_inputs_generates_different_auth_tokens() { + let data1 = vec![1u8; 55]; + let data2 = vec![2u8; 55]; + let key = Scalar::from_bytes_mod_order([1u8; 32]); + let token1 = ClientRequestProcessor::generate_new_auth_token(data1, key); + let token2 = ClientRequestProcessor::generate_new_auth_token(data2, key); + assert_ne!(token1, token2); + + let data1 = vec![1u8; 50]; + let data2 = vec![2u8; 55]; + let key = Scalar::from_bytes_mod_order([1u8; 32]); + let token1 = ClientRequestProcessor::generate_new_auth_token(data1, key); + let token2 = ClientRequestProcessor::generate_new_auth_token(data2, key); + assert_ne!(token1, token2); + } +} diff --git a/src/provider/mix_handling/mod.rs b/src/provider/mix_handling/mod.rs new file mode 100644 index 0000000000..23d46c2d86 --- /dev/null +++ b/src/provider/mix_handling/mod.rs @@ -0,0 +1,83 @@ +use crate::provider::storage::StoreData; +use curve25519_dalek::scalar::Scalar; +use sphinx::{ProcessedPacket, SphinxPacket}; +use std::path::PathBuf; +use std::sync::{Arc, RwLock}; + +// TODO: this will probably need to be moved elsewhere I imagine +// DUPLICATE WITH MIXNODE CODE!!! +#[derive(Debug)] +pub enum MixProcessingError { + SphinxRecoveryError, + ReceivedForwardHopError, + InvalidPayload, + NonMatchingRecipient, + FileIOFailure, +} + +impl From for MixProcessingError { + // for time being just have a single error instance for all possible results of sphinx::ProcessingError + fn from(_: sphinx::ProcessingError) -> Self { + use MixProcessingError::*; + + SphinxRecoveryError + } +} + +impl From for MixProcessingError { + fn from(_: std::io::Error) -> Self { + use MixProcessingError::*; + + FileIOFailure + } +} + +// ProcessingData defines all data required to correctly unwrap sphinx packets +#[derive(Debug, Clone)] +pub(crate) struct MixProcessingData { + secret_key: Scalar, + pub(crate) store_dir: PathBuf, +} + +impl MixProcessingData { + pub(crate) fn new(secret_key: Scalar, store_dir: PathBuf) -> Self { + MixProcessingData { + secret_key, + store_dir, + } + } + + pub(crate) fn add_arc_rwlock(self) -> Arc> { + Arc::new(RwLock::new(self)) + } +} + +pub(crate) struct MixPacketProcessor(()); + +impl MixPacketProcessor { + pub fn process_sphinx_data_packet( + packet_data: &[u8], + processing_data: &RwLock, + ) -> Result { + let packet = SphinxPacket::from_bytes(packet_data.to_vec())?; + let read_processing_data = processing_data.read().unwrap(); + let (client_address, client_surb_id, payload) = + match packet.process(read_processing_data.secret_key) { + ProcessedPacket::ProcessedPacketFinalHop(client_address, surb_id, payload) => { + (client_address, surb_id, payload) + } + _ => return Err(MixProcessingError::ReceivedForwardHopError), + }; + + // TODO: should provider try to be recovering plaintext? this would potentially make client retrieve messages of non-constant length, + // perhaps provider should be re-padding them on retrieval or storing full data? + let (payload_destination, message) = payload + .try_recover_destination_and_plaintext() + .ok_or_else(|| MixProcessingError::InvalidPayload)?; + if client_address != payload_destination { + return Err(MixProcessingError::NonMatchingRecipient); + } + + Ok(StoreData::new(client_address, client_surb_id, message)) + } +} diff --git a/src/provider/mod.rs b/src/provider/mod.rs new file mode 100644 index 0000000000..c673496f58 --- /dev/null +++ b/src/provider/mod.rs @@ -0,0 +1,321 @@ +use crate::provider::client_handling::{ClientProcessingData, ClientRequestProcessor}; +use crate::provider::mix_handling::{MixPacketProcessor, MixProcessingData}; +use crate::provider::storage::ClientStorage; +use curve25519_dalek::montgomery::MontgomeryPoint; +use curve25519_dalek::scalar::Scalar; +use futures::io::Error; +use futures::lock::Mutex as FMutex; +use nym_client::clients::directory::presence::MixProviderClient; +use sfw_provider_requests::AuthToken; +use sphinx::route::DestinationAddressBytes; +use std::collections::HashMap; +use std::net::{Shutdown, SocketAddr}; +use std::path::PathBuf; +use std::sync::Arc; +use std::sync::RwLock; +use tokio::prelude::*; +use tokio::runtime::Runtime; + +mod client_handling; +mod mix_handling; +pub mod presence; +mod storage; + +// TODO: if we ever create config file, this should go there +const STORED_MESSAGE_FILENAME_LENGTH: usize = 16; +const MESSAGE_RETRIEVAL_LIMIT: usize = 5; + +pub struct Config { + pub client_socket_address: SocketAddr, + pub directory_server: String, + pub mix_socket_address: SocketAddr, + pub public_key: MontgomeryPoint, + pub secret_key: Scalar, + pub store_dir: PathBuf, +} + +impl Config { + pub fn public_key_string(public_key: MontgomeryPoint) -> String { + let key_bytes = public_key.to_bytes().to_vec(); + base64::encode_config(&key_bytes, base64::URL_SAFE) + } +} + +#[derive(Debug)] +pub enum ProviderError { + TcpListenerBindingError, + TcpListenerConnectionError, + TcpListenerUnexpectedEof, + + TcpListenerUnknownError, +} + +impl From for ProviderError { + fn from(err: Error) -> Self { + use ProviderError::*; + match err.kind() { + io::ErrorKind::ConnectionRefused => TcpListenerConnectionError, + io::ErrorKind::ConnectionReset => TcpListenerConnectionError, + io::ErrorKind::ConnectionAborted => TcpListenerConnectionError, + io::ErrorKind::NotConnected => TcpListenerConnectionError, + + io::ErrorKind::AddrInUse => TcpListenerBindingError, + io::ErrorKind::AddrNotAvailable => TcpListenerBindingError, + io::ErrorKind::UnexpectedEof => TcpListenerUnexpectedEof, + _ => TcpListenerUnknownError, + } + } +} + +#[derive(Debug)] +pub struct ClientLedger(HashMap); + +impl ClientLedger { + fn new() -> Self { + ClientLedger(HashMap::new()) + } + + fn add_arc_futures_mutex(self) -> Arc> { + Arc::new(FMutex::new(self)) + } + + fn has_token(&self, auth_token: AuthToken) -> bool { + return self.0.contains_key(&auth_token); + } + + fn insert_token( + &mut self, + auth_token: AuthToken, + client_address: DestinationAddressBytes, + ) -> Option { + self.0.insert(auth_token, client_address) + } + + fn current_clients(&self) -> Vec { + self.0 + .iter() + .map(|(_, &v)| Config::public_key_string(MontgomeryPoint(v))) + .map(|pub_key| MixProviderClient { pub_key }) + .collect() + } + + #[allow(dead_code)] + fn load(_file: PathBuf) -> Self { + unimplemented!() + } +} + +pub struct ServiceProvider { + directory_server: String, + mix_network_address: SocketAddr, + client_network_address: SocketAddr, + secret_key: Scalar, + public_key: MontgomeryPoint, + store_dir: PathBuf, + registered_clients_ledger: ClientLedger, +} + +impl ServiceProvider { + pub fn new(config: &Config) -> Self { + ServiceProvider { + mix_network_address: config.mix_socket_address, + client_network_address: config.client_socket_address, + secret_key: config.secret_key, + public_key: config.public_key, + store_dir: PathBuf::from(config.store_dir.clone()), + // TODO: load initial ledger from file + registered_clients_ledger: ClientLedger::new(), + directory_server: config.directory_server.clone(), + } + } + + async fn process_mixnet_socket_connection( + mut socket: tokio::net::TcpStream, + processing_data: Arc>, + ) { + let mut buf = [0u8; sphinx::PACKET_SIZE]; + + // In a loop, read data from the socket and write the data back. + loop { + match socket.read(&mut buf).await { + // socket closed + Ok(n) if n == 0 => { + println!("Remote connection closed."); + return; + } + Ok(_) => { + let store_data = match MixPacketProcessor::process_sphinx_data_packet( + buf.as_ref(), + processing_data.as_ref(), + ) { + Ok(sd) => sd, + Err(e) => { + eprintln!("failed to process sphinx packet; err = {:?}", e); + return; + } + }; + ClientStorage::store_processed_data( + store_data, + processing_data.read().unwrap().store_dir.as_path(), + ) + .unwrap_or_else(|e| { + eprintln!("failed to store processed sphinx message; err = {:?}", e); + return; + }); + } + Err(e) => { + eprintln!("failed to read from socket; err = {:?}", e); + return; + } + }; + + // Write the some data back + if let Err(e) = socket.write_all(b"foomp").await { + eprintln!("failed to write reply to socket; err = {:?}", e); + return; + } + } + } + + async fn send_response(mut socket: tokio::net::TcpStream, data: &[u8]) { + if let Err(e) = socket.write_all(data).await { + eprintln!("failed to write reply to socket; err = {:?}", e) + } + if let Err(e) = socket.shutdown(Shutdown::Write) { + eprintln!("failed to close write part of the socket; err = {:?}", e) + } + } + + // TODO: FIGURE OUT HOW TO SET READ_DEADLINES IN TOKIO + async fn process_client_socket_connection( + mut socket: tokio::net::TcpStream, + processing_data: Arc, + ) { + let mut buf = [0; 1024]; + + // TODO: restore the for loop once we go back to persistent tcp socket connection + let response = match socket.read(&mut buf).await { + // socket closed + Ok(n) if n == 0 => { + println!("Remote connection closed."); + Err(()) + } + Ok(n) => { + match ClientRequestProcessor::process_client_request( + buf[..n].as_ref(), + processing_data, + ) + .await + { + Err(e) => { + eprintln!("failed to process client request; err = {:?}", e); + Err(()) + } + Ok(res) => Ok(res), + } + } + Err(e) => { + eprintln!("failed to read from socket; err = {:?}", e); + Err(()) + } + }; + + if let Err(e) = socket.shutdown(Shutdown::Read) { + eprintln!("failed to close read part of the socket; err = {:?}", e) + } + + match response { + Ok(res) => { + println!("should send this response! {:?}", res); + ServiceProvider::send_response(socket, &res).await; + } + _ => { + println!("we failed..."); + ServiceProvider::send_response(socket, b"bad foomp").await; + } + } + } + + async fn start_mixnet_listening( + address: SocketAddr, + secret_key: Scalar, + store_dir: PathBuf, + ) -> Result<(), ProviderError> { + let mut listener = tokio::net::TcpListener::bind(address).await?; + let processing_data = MixProcessingData::new(secret_key, store_dir).add_arc_rwlock(); + + loop { + let (socket, _) = listener.accept().await?; + // do note that the underlying data is NOT copied here; arc is incremented and lock is shared + // (if I understand it all correctly) + let thread_processing_data = processing_data.clone(); + tokio::spawn(async move { + ServiceProvider::process_mixnet_socket_connection(socket, thread_processing_data) + .await + }); + } + } + + async fn start_client_listening( + address: SocketAddr, + store_dir: PathBuf, + client_ledger: Arc>, + secret_key: Scalar, + ) -> Result<(), ProviderError> { + let mut listener = tokio::net::TcpListener::bind(address).await?; + let processing_data = + ClientProcessingData::new(store_dir, client_ledger, secret_key).add_arc(); + + loop { + let (socket, _) = listener.accept().await?; + // do note that the underlying data is NOT copied here; arc is incremented and lock is shared + // (if I understand it all correctly) + let thread_processing_data = processing_data.clone(); + tokio::spawn(async move { + ServiceProvider::process_client_socket_connection(socket, thread_processing_data) + .await + }); + } + } + + // Note: this now consumes the provider + pub fn start(self) -> Result<(), Box> { + // Create the runtime, probably later move it to Provider struct itself? + // TODO: figure out the difference between Runtime and Handle + let mut rt = Runtime::new()?; + // let mut h = rt.handle(); + + let initial_client_ledger = self.registered_clients_ledger; + let thread_shareable_ledger = initial_client_ledger.add_arc_futures_mutex(); + + let presence_notifier = presence::Notifier::new( + self.directory_server, + self.mix_network_address.clone(), + self.public_key, + thread_shareable_ledger.clone(), + ); + + let presence_future = rt.spawn(presence_notifier.run()); + let mix_future = rt.spawn(ServiceProvider::start_mixnet_listening( + self.mix_network_address, + self.secret_key, + self.store_dir.clone(), + )); + let client_future = rt.spawn(ServiceProvider::start_client_listening( + self.client_network_address, + self.store_dir.clone(), + thread_shareable_ledger, + self.secret_key, + )); + // Spawn the root task + rt.block_on(async { + let future_results = + futures::future::join3(mix_future, client_future, presence_future).await; + assert!(future_results.0.is_ok() && future_results.1.is_ok()); + }); + + // this line in theory should never be reached as the runtime should be permanently blocked on listeners + eprintln!("The server went kaput..."); + Ok(()) + } +} diff --git a/src/provider/presence.rs b/src/provider/presence.rs new file mode 100644 index 0000000000..d1790b685a --- /dev/null +++ b/src/provider/presence.rs @@ -0,0 +1,64 @@ +use crate::provider::{ClientLedger, Config}; +use curve25519_dalek::montgomery::MontgomeryPoint; +use futures::lock::Mutex as FMutex; +use nym_client::clients::directory; +use nym_client::clients::directory::presence::MixProviderPresence; +use nym_client::clients::directory::requests::presence_providers_post::PresenceMixProviderPoster; +use nym_client::clients::directory::DirectoryClient; +use std::net::SocketAddr; +use std::sync::Arc; +use std::time::Duration; + +pub struct Notifier { + pub net_client: directory::Client, + client_ledger: Arc>, + host: String, + pub_key: String, +} + +impl Notifier { + pub fn new( + directory_server_address: String, + host: SocketAddr, + pub_key: MontgomeryPoint, + client_ledger: Arc>, + ) -> Notifier { + let directory_config = directory::Config { + base_url: directory_server_address, + }; + let net_client = directory::Client::new(directory_config); + + Notifier { + net_client, + host: host.to_string(), + pub_key: Config::public_key_string(pub_key), + client_ledger, + } + } + + async fn make_presence(&self) -> MixProviderPresence { + let unlocked_ledger = self.client_ledger.lock().await; + + MixProviderPresence { + host: self.host.clone(), + pub_key: self.pub_key.clone(), + registered_clients: unlocked_ledger.current_clients(), + } + } + + pub fn notify(&self, presence: MixProviderPresence) { + self.net_client + .presence_providers_post + .post(&presence) + .unwrap(); + } + + pub async fn run(self) { + loop { + let presence = self.make_presence().await; + self.notify(presence); + let delay_duration = Duration::from_secs(5); + tokio::time::delay_for(delay_duration).await; + } + } +} diff --git a/src/provider/storage/mod.rs b/src/provider/storage/mod.rs new file mode 100644 index 0000000000..a44f76a8e7 --- /dev/null +++ b/src/provider/storage/mod.rs @@ -0,0 +1,129 @@ +use crate::provider::{MESSAGE_RETRIEVAL_LIMIT, STORED_MESSAGE_FILENAME_LENGTH}; +use rand::Rng; +use sfw_provider_requests::DUMMY_MESSAGE_CONTENT; +use sphinx::route::{DestinationAddressBytes, SURBIdentifier}; +use std::fs::File; +use std::io; +use std::io::Write; +use std::path::{Path, PathBuf}; + +pub enum StoreError { + ClientDoesntExistError, + FileIOFailure, +} + +impl From for StoreError { + fn from(_: std::io::Error) -> Self { + use StoreError::*; + + FileIOFailure + } +} + +pub struct StoreData { + client_address: DestinationAddressBytes, + #[allow(dead_code)] + client_surb_id: SURBIdentifier, + message: Vec, +} + +impl StoreData { + pub(crate) fn new( + client_address: DestinationAddressBytes, + client_surb_id: SURBIdentifier, + message: Vec, + ) -> Self { + StoreData { + client_address, + client_surb_id, + message, + } + } +} + +// TODO: replace with database +pub struct ClientStorage(()); + +// TODO: change it to some generic implementation to inject fs +impl ClientStorage { + pub(crate) fn generate_random_file_name() -> String { + rand::thread_rng() + .sample_iter(&rand::distributions::Alphanumeric) + .take(STORED_MESSAGE_FILENAME_LENGTH) + .collect::() + } + + fn dummy_message() -> Vec { + // TODO: should it be padded to constant length? + DUMMY_MESSAGE_CONTENT.to_vec() + } + + pub fn store_processed_data(store_data: StoreData, store_dir: &Path) -> io::Result<()> { + let client_dir_name = hex::encode(store_data.client_address); + let full_store_dir = store_dir.join(client_dir_name); + let full_store_path = full_store_dir.join(ClientStorage::generate_random_file_name()); + println!( + "going to store: {:?} in file: {:?}", + store_data.message, full_store_path + ); + + println!( + "string message: {:?}", + std::str::from_utf8(&store_data.message) + ); + + // TODO: what to do with surbIDs?? + + // we can use normal io here, no need for tokio as it's all happening in one thread per connection + let mut file = File::create(full_store_path)?; + file.write_all(store_data.message.as_ref())?; + + Ok(()) + } + + pub fn retrieve_client_files( + client_address: DestinationAddressBytes, + store_dir: &Path, + ) -> Result>, StoreError> { + let client_dir_name = hex::encode(client_address); + let full_store_dir = store_dir.join(client_dir_name); + + println!("going to lookup: {:?}!", full_store_dir); + if !full_store_dir.exists() { + return Err(StoreError::ClientDoesntExistError); + } + + let msgs: Vec<_> = std::fs::read_dir(full_store_dir)? + .map(|entry| entry.unwrap()) + .filter(|entry| { + let is_file = entry.metadata().unwrap().is_file(); + if !is_file { + eprintln!( + "potentially corrupted client inbox! - found a non-file - {:?}", + entry.path() + ); + } + is_file + }) + .map(|entry| { + let content = std::fs::read(entry.path()).unwrap(); + ClientStorage::delete_file(entry.path()).unwrap(); + content + }) // TODO: THIS MAP IS UNSAFE (BOTH FOR READING AND DELETING)!! - in the case where there are multiple requests from the same client being processed in parallel + .chain(std::iter::repeat(ClientStorage::dummy_message())) + .take(MESSAGE_RETRIEVAL_LIMIT) + .collect(); + + println!("retrieved the following data: {:?}", msgs); + + Ok(msgs) + } + + // TODO: THIS NEEDS A LOCKING MECHANISM!!! (or a db layer on top - basically 'ClientStorage' on steroids) + // TODO 2: This should only be called AFTER we sent the reply. Because if client's connection failed after sending request + // the messages would be deleted but he wouldn't have received them + fn delete_file(path: PathBuf) -> io::Result<()> { + println!("Here {:?} will be deleted!", path); + std::fs::remove_file(path) // another argument for db layer -> remove_file is NOT guaranteed to immediately get rid of the file + } +}