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94 lines
3.2 KiB
94 lines
3.2 KiB
use anyhow::{Context, Result};
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use monero::consensus::encode::VarInt;
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use monero::cryptonote::hash::Hashable;
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use monero_rpc::monerod;
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use monero_rpc::monerod::{GetBlockResponse, MonerodRpc as _};
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use rand::Rng;
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pub struct Wallet {
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client: monerod::Client,
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}
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impl Wallet {
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/// Chooses 10 random key offsets for use within a new confidential
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/// transactions.
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///
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/// Choosing these offsets randomly is not ideal for privacy, instead they
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/// should be chosen in a way that mimics a real spending pattern as much as
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/// possible.
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pub async fn choose_ten_random_key_offsets(&self) -> Result<[VarInt; 10]> {
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let latest_block = self.client.get_block_count().await?;
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let latest_spendable_block = latest_block.count - 10;
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let block: GetBlockResponse = self.client.get_block(latest_spendable_block).await?;
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let tx_hash = block
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.blob
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.tx_hashes
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.first()
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.copied()
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.unwrap_or_else(|| block.blob.miner_tx.hash());
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let indices = self.client.get_o_indexes(tx_hash).await?;
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let last_index = indices
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.o_indexes
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.into_iter()
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.max()
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.context("Expected at least one output index")?;
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let oldest_index = last_index - (last_index / 100) * 40; // oldest index must be within last 40% TODO: CONFIRM THIS
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let mut rng = rand::thread_rng();
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Ok([
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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VarInt(rng.gen_range(oldest_index, last_index)),
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])
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use monero_harness::image::Monerod;
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use monero_rpc::monerod::{Client, GetOutputsOut};
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use testcontainers::clients::Cli;
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use testcontainers::Docker;
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#[tokio::test]
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async fn get_outs_for_key_offsets() {
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let cli = Cli::default();
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let container = cli.run(Monerod::default());
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let rpc_client = Client::localhost(container.get_host_port(18081).unwrap()).unwrap();
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rpc_client.generateblocks(150, "498AVruCDWgP9Az9LjMm89VWjrBrSZ2W2K3HFBiyzzrRjUJWUcCVxvY1iitfuKoek2FdX6MKGAD9Qb1G1P8QgR5jPmmt3Vj".to_owned()).await.unwrap();
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let wallet = Wallet {
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client: rpc_client.clone(),
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};
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let key_offsets = wallet.choose_ten_random_key_offsets().await.unwrap();
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let result = rpc_client
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.get_outs(
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key_offsets
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.to_vec()
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.into_iter()
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.map(|varint| GetOutputsOut {
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amount: 0,
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index: varint.0,
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})
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.collect(),
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)
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.await
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.unwrap();
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assert_eq!(result.outs.len(), 10);
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}
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}
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