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use byteorder::ReadBytesExt; use bytes::{BufMut, Bytes, BytesMut}; use interledger_packet::{ oer::{predict_var_octet_string, BufOerExt, MutBufOerExt}, Fulfill, FulfillBuilder, ParseError, Prepare, PrepareBuilder, }; use std::{ fmt, str, time::{Duration, SystemTime}, }; static ILDCP_DESTINATION: &'static [u8] = b"peer.config"; static PEER_PROTOCOL_FULFILLMENT: [u8; 32] = [0; 32]; static PEER_PROTOCOL_CONDITION: [u8; 32] = [ 102, 104, 122, 173, 248, 98, 189, 119, 108, 143, 193, 139, 142, 159, 142, 32, 8, 151, 20, 133, 110, 226, 51, 179, 144, 42, 89, 29, 13, 95, 41, 37, ]; const ASSET_SCALE_LEN: usize = 1; lazy_static! { static ref PEER_PROTOCOL_EXPIRY_DURATION: Duration = Duration::from_secs(60); } pub fn is_ildcp_request(prepare: &Prepare) -> bool { prepare.execution_condition() == PEER_PROTOCOL_CONDITION && prepare.destination() == ILDCP_DESTINATION } #[derive(Debug, Default)] pub struct IldcpRequest {} impl IldcpRequest { pub fn new() -> Self { IldcpRequest {} } pub fn to_prepare(&self) -> Prepare { PrepareBuilder { destination: ILDCP_DESTINATION, amount: 0, execution_condition: &PEER_PROTOCOL_CONDITION, expires_at: SystemTime::now() + *PEER_PROTOCOL_EXPIRY_DURATION, data: &[], } .build() } } impl From<IldcpRequest> for Prepare { fn from(request: IldcpRequest) -> Self { request.to_prepare() } } #[derive(Clone, PartialEq)] pub struct IldcpResponse { buffer: Bytes, asset_scale: u8, asset_code_offset: usize, } impl From<IldcpResponse> for Bytes { fn from(response: IldcpResponse) -> Self { response.buffer } } impl From<IldcpResponse> for Fulfill { fn from(response: IldcpResponse) -> Self { FulfillBuilder { fulfillment: &PEER_PROTOCOL_FULFILLMENT, data: &response.buffer[..], } .build() } } impl IldcpResponse { pub fn try_from(buffer: Bytes) -> Result<Self, ParseError> { let mut reader = &buffer[..]; let buffer_len = reader.len(); reader.skip_var_octet_string()?; let asset_scale = reader.read_u8()?; let asset_code_offset = buffer_len - reader.len(); reader.skip_var_octet_string()?; Ok(IldcpResponse { buffer, asset_scale, asset_code_offset, }) } pub fn client_address(&self) -> &[u8] { (&self.buffer[..]).peek_var_octet_string().unwrap() } pub fn asset_scale(&self) -> u8 { self.asset_scale } pub fn asset_code(&self) -> &[u8] { (&self.buffer[self.asset_code_offset..]) .peek_var_octet_string() .unwrap() } } impl fmt::Debug for IldcpResponse { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!( f, "IldcpResponse {{ client_address: \"{}\", asset_code: \"{}\", asset_scale: {} }}", str::from_utf8(self.client_address()).unwrap_or("<not utf8>"), str::from_utf8(self.asset_code()).unwrap_or("<not utf8>"), self.asset_scale ) } } #[derive(Debug, PartialEq)] pub struct IldcpResponseBuilder<'a> { pub client_address: &'a [u8], pub asset_scale: u8, pub asset_code: &'a str, } impl<'a> IldcpResponseBuilder<'a> { pub fn build(&self) -> IldcpResponse { let address_size = predict_var_octet_string(self.client_address.len()); let asset_code_size = predict_var_octet_string(self.asset_code.len()); let buf_size = ASSET_SCALE_LEN + address_size + asset_code_size; let mut buffer = BytesMut::with_capacity(buf_size); buffer.put_var_octet_string_length(self.client_address.len()); buffer.put_slice(self.client_address); buffer.put_u8(self.asset_scale); buffer.put_var_octet_string_length(self.asset_code.len()); buffer.put_slice(self.asset_code.as_bytes()); IldcpResponse { buffer: buffer.freeze(), asset_scale: self.asset_scale, asset_code_offset: address_size + ASSET_SCALE_LEN, } } }