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use std::io::{Read, Write};
use crate::Error;
pub const INFO_MSG: &[u8; 29] = br#"{"system":{"get_sysinfo":{}}}"#;
pub trait SHomeProtocol {
fn recv(&mut self) -> Result<String, Error>;
fn send(&mut self, msg: &str) -> Result<(), Error>;
fn encrypt(msg: &str) -> Vec<u8> {
msg.as_bytes()
.iter()
.scan(0xAB, |key, b| {
*key ^= *b;
Some(*key)
})
.collect()
}
fn decrypt(bytes: &[u8]) -> Result<String, Error> {
let buf: Vec<u8> = bytes
.iter()
.scan(0xAB, |key, b| {
let xor = *b ^ *key;
*key = *b;
Some(xor)
})
.collect();
Ok(std::str::from_utf8(&buf)?.to_owned())
}
}
//impl SHomeProtocol for UdpSocket {
// fn recv(&mut self) -> Result<String, Error> {
// todo!()
// }
//
// fn send(&mut self, msg: &str) -> Result<(), Error> {
// todo!()
// }
//}
impl<T: Read + Write> SHomeProtocol for T {
fn recv(&mut self) -> Result<String, Error> {
let mut buf = [0; 4];
self.read_exact(&mut buf)?;
let mut buf = vec![0; u32::from_be_bytes(buf) as usize];
self.read_exact(&mut buf)?;
Self::decrypt(&buf)
}
fn send(&mut self, msg: &str) -> Result<(), Error> {
let buf = Self::encrypt(msg);
self.write_all(&(buf.len() as u32).to_be_bytes())?;
self.write_all(&buf)?;
Ok(())
}
}
#[cfg(test)]
pub(crate) mod tests {
use crate::Device;
use super::*;
#[test]
fn test_get_sysinfo() -> Result<(), Error> {
let mut device = Device::connect("10.42.0.119:9999")?;
let msg = device.send(r#"{"system":{"get_sysinfo":{}}}"#)?;
assert!(!msg.is_empty());
println!("{msg}");
Ok(())
}
}
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