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use thiserror::Error;
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub enum RpcFilterType {
DataSize(u64),
Memcmp(Memcmp),
}
impl RpcFilterType {
pub fn verify(&self) -> Result<(), RpcFilterError> {
match self {
RpcFilterType::DataSize(_) => Ok(()),
RpcFilterType::Memcmp(compare) => {
let encoding = compare.encoding.as_ref().unwrap_or(&MemcmpEncoding::Binary);
match encoding {
MemcmpEncoding::Binary => {
let MemcmpEncodedBytes::Binary(bytes) = &compare.bytes;
bs58::decode(&bytes)
.into_vec()
.map(|_| ())
.map_err(|e| e.into())
}
}
}
}
}
}
#[derive(Error, Debug)]
pub enum RpcFilterError {
#[error("bs58 decode error")]
DecodeError(#[from] bs58::decode::Error),
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub enum MemcmpEncoding {
Binary,
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase", untagged)]
pub enum MemcmpEncodedBytes {
Binary(String),
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct Memcmp {
pub offset: usize,
pub bytes: MemcmpEncodedBytes,
pub encoding: Option<MemcmpEncoding>,
}
impl Memcmp {
pub fn bytes_match(&self, data: &[u8]) -> bool {
match &self.bytes {
MemcmpEncodedBytes::Binary(bytes) => {
let bytes = bs58::decode(bytes).into_vec();
if bytes.is_err() {
return false;
}
let bytes = bytes.unwrap();
if self.offset > data.len() {
return false;
}
if data[self.offset..].len() < bytes.len() {
return false;
}
data[self.offset..self.offset + bytes.len()] == bytes[..]
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_bytes_match() {
let data = vec![1, 2, 3, 4, 5];
assert!(Memcmp {
offset: 0,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![1, 2, 3, 4, 5]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(Memcmp {
offset: 0,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![1, 2]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(Memcmp {
offset: 2,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![3, 4]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(!Memcmp {
offset: 0,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![2]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(!Memcmp {
offset: 2,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![3, 4, 5, 6]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(!Memcmp {
offset: 6,
bytes: MemcmpEncodedBytes::Binary(bs58::encode(vec![5]).into_string()),
encoding: None,
}
.bytes_match(&data));
assert!(!Memcmp {
offset: 0,
bytes: MemcmpEncodedBytes::Binary("III".to_string()),
encoding: None,
}
.bytes_match(&data));
}
}