uniauth 2.1.1

Easy-to-use abstraction over authentication
Documentation 
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//! Utility functions and traits

use std::{
	io::{Error, ErrorKind, Result},
	marker::{Send, Unpin}
};

use async_trait::async_trait;
pub use byteorder::{LittleEndian as LE, ReadBytesExt, WriteBytesExt};
use tokio::io::{AsyncReadExt, AsyncWriteExt};

/// Helper function to make a packet vec
#[inline]
pub fn make_packet<F>(n: usize, f: F) -> Result<Vec<u8>>
	where F: Fn(&mut Vec<u8>) -> Result<()>
{
	let mut packet = Vec::with_capacity(n);
	f(&mut packet)?;
	Ok(packet)
}

pub trait WriteExtraExt : WriteBytesExt {
	/// Writes a utf-8 string prepended by a byte with the length, in bytes, of the string
	fn write_str(&mut self, s: &str) -> Result<()> {
		self.write_b8(s.as_bytes())
	}
	/// Writes a Vec of bytes prepended with 1 byte length
	fn write_b8(&mut self, bytes: &[u8]) -> Result<()>;
	/// Writes a Vec of bytes prepended with 2 bytes length
	fn write_b16(&mut self, bytes: &[u8]) -> Result<()>;
	/// Writes a Vec of bytes prepended with 4 bytes length
	fn write_b32(&mut self, bytes: &[u8], max: usize) -> Result<()>;
}

impl <W: WriteBytesExt> WriteExtraExt for W {
	fn write_b8(&mut self, bytes: &[u8]) -> Result<()> {
		if bytes.len() > u8::MAX.into() {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u8(bytes.len() as u8)?;
		self.write_all(bytes)
	}

	fn write_b16(&mut self, bytes: &[u8]) -> Result<()> {
		if bytes.len() > u16::MAX as usize {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u16::<LE>(bytes.len() as u16)?;
		self.write_all(bytes)
	}

	fn write_b32(&mut self, bytes: &[u8], max: usize) -> Result<()> {
		if bytes.len() > max {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u32::<LE>(bytes.len() as u32)?;
		self.write_all(bytes)
	}
}

#[async_trait]
pub trait AsyncWriteExtraExt : AsyncWriteExt {
	/// Writes a utf-8 string prepended by a byte with the length, in bytes, of the string
	async fn write_str(&mut self, s: &str) -> Result<()> {
		self.write_b8(s.as_bytes()).await
	}

	/// Writes a Vec of bytes prepended with 1 byte length
	async fn write_b8(&mut self, bytes: &[u8]) -> Result<()>;
	/// Writes a Vec of bytes prepended with 2 bytes length
	async fn write_b16(&mut self, bytes: &[u8]) -> Result<()>;
	/// Writes a Vec of bytes prepended with 4 bytes length
	async fn write_b32(&mut self, bytes: &[u8], max: usize) -> Result<()>;
}

#[async_trait]
impl <W: AsyncWriteExt + Send + Unpin> AsyncWriteExtraExt for W {
	async fn write_b8(&mut self, bytes: &[u8]) -> Result<()> {
		if bytes.len() > u8::MAX.into() {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u8(bytes.len() as u8).await?;
		self.write_all(bytes).await
	}

	async fn write_b16(&mut self, bytes: &[u8]) -> Result<()> {
		if bytes.len() > u16::MAX as usize {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u16_le(bytes.len() as u16).await?;
		self.write_all(bytes).await
	}

	async fn write_b32(&mut self, bytes: &[u8], max: usize) -> Result<()> {
		if bytes.len() > max {
			return Err(Error::new(ErrorKind::InvalidInput, "Data too long to read back"));
		}

		self.write_u32_le(bytes.len() as u32).await?;
		self.write_all(bytes).await
	}
}

pub trait ReadExtraExt : ReadBytesExt {
	/// Reads a 0-255 byte utf-8 encoded string
	fn read_str(&mut self) -> Result<String> {
		let bytes = self.read_b8()?;
		String::from_utf8(bytes)
			.map_err(|_| Error::new(ErrorKind::InvalidData, "String contains non-utf8 bytes"))
	}

	/// Reads a Vec of bytes prepended with 1 byte length
	fn read_b8(&mut self) -> Result<Vec<u8>>;
	/// Reads a Vec of bytes prepended with 2 bytes length
	fn read_b16(&mut self) -> Result<Vec<u8>>;
	/// Reads a Vec of bytes prepended with 4 bytes length
	fn read_b32(&mut self, max: usize) -> Result<Vec<u8>>;
}

impl <R: ReadBytesExt> ReadExtraExt for R {
	fn read_b8(&mut self) -> Result<Vec<u8>> {
		let len = self.read_u8()? as usize;
		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes)?;
		Ok(bytes)
	}

	fn read_b16(&mut self) -> Result<Vec<u8>> {
		let len = self.read_u16::<LE>()? as usize;
		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes)?;
		Ok(bytes)
	}

	fn read_b32(&mut self, max: usize) -> Result<Vec<u8>> {
		let len = self.read_u32::<LE>()? as usize;
		if len > max {
			return Err(Error::new(ErrorKind::InvalidData, "Data too long"));
		}

		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes)?;
		Ok(bytes)
	}
}

#[async_trait]
pub trait AsyncReadExtraExt : AsyncReadExt {
	/// Reads a 0-255 byte utf-8 encoded string
	async fn read_str(&mut self) -> Result<String> {
		let bytes = self.read_b8().await?;
		String::from_utf8(bytes)
			.map_err(|_| Error::new(ErrorKind::InvalidData, "String contains non-utf8 bytes"))
	}

	/// Reads a Vec of bytes prepended with 1 byte length
	async fn read_b8(&mut self) -> Result<Vec<u8>>;
	/// Reads a Vec of bytes prepended with 2 bytes length
	async fn read_b16(&mut self) -> Result<Vec<u8>>;
	/// Reads a Vec of bytes prepended with 4 bytes length
	async fn read_b32(&mut self, max: usize) -> Result<Vec<u8>>;
}

#[async_trait]
impl <R: AsyncReadExt + Send + Unpin> AsyncReadExtraExt for R {
	async fn read_b8(&mut self) -> Result<Vec<u8>> {
		let len = self.read_u8().await? as usize;
		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes).await?;
		Ok(bytes)
	}

	async fn read_b16(&mut self) -> Result<Vec<u8>> {
		let len = self.read_u16_le().await? as usize;
		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes).await?;
		Ok(bytes)
	}

	async fn read_b32(&mut self, max: usize) -> Result<Vec<u8>> {
		let len = self.read_u32_le().await? as usize;
		if len > max {
			return Err(Error::new(ErrorKind::InvalidData, "Data too long"));
		}

		let mut bytes = vec![0; len];
		self.read_exact(&mut bytes).await?;
		Ok(bytes)
	}
}