1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124

//! A data implementation that ensures that it's bytes correspond to a particular encoding like
//! UTF-8, ASCII etc.
//!
//! This mod is used to constrain the HTTP header parts to their context-specific encoding.

pub mod encodings;

use crate::{
	HttpError,
	data::encodings::{ Encoding, Utf8Subset, Integer }
};
use std::{
	str, u128, convert::TryFrom, marker::PhantomData, num::ParseIntError, ops::Deref,
	hash::{ Hash, Hasher }, fmt::{ self, Display, Formatter }
};


/// A helper macro to convert a static `$str` into a `Data`-target using the `TryInto`-trait
///
/// _Panics if `try_into` fails_
#[macro_export] macro_rules! data {
	($str:expr) => ({
		let str: &'static str = $str;
		::std::convert::TryInto::try_into(str).unwrap()
	});
}


/// Some data that conforms to a specific encoding
#[derive(Clone, Debug)]
pub struct Data<E: Encoding> {
	bytes: Vec<u8>,
	_encoding: PhantomData<E>
}
impl<E: Encoding> Data<E> {
	/// Validates that `bytes` conform to the encoding `M`
	pub fn validate(bytes: &[u8]) -> bool {
		E::is_valid(bytes)
	}
}
impl<E: Encoding> Deref for Data<E> {
	type Target = [u8];
	fn deref(&self) -> &Self::Target {
		&self.bytes
	}
}
impl<E: Encoding> AsRef<[u8]> for Data<E> {
	fn as_ref(&self) -> &[u8] {
		self
	}
}
impl<E: Encoding + Utf8Subset> AsRef<str> for Data<E> {
	fn as_ref(&self) -> &str {
		str::from_utf8(self).unwrap()
	}
}
impl<E: Encoding + Utf8Subset> Display for Data<E> {
	fn fmt(&self, f: &mut Formatter) -> fmt::Result {
		f.write_str(self.as_ref())
	}
}
impl<E: Encoding> PartialEq for Data<E> {
	fn eq(&self, other: &Data<E>) -> bool {
		E::is_eq(self, other)
	}
}
impl<E: Encoding> PartialEq<&str> for Data<E> {
	fn eq(&self, other: &&str) -> bool {
		E::is_eq(self, other.as_bytes())
	}
}
impl<E: Encoding> PartialEq<Data<E>> for &str {
	fn eq(&self, other: &Data<E>) -> bool {
		E::is_eq(self.as_bytes(), other)
	}
}
impl<E: Encoding> Eq for Data<E> {}
impl<E: Encoding> Hash for Data<E> {
	fn hash<H: Hasher>(&self, state: &mut H) {
		E::hash(self, state)
	}
}


impl<E: Encoding> TryFrom<&str> for Data<E> {
	type Error = HttpError;
	fn try_from(source: &str) -> Result<Self, Self::Error> {
		Self::try_from(source.as_bytes())
	}
}
impl<E: Encoding> TryFrom<&[u8]> for Data<E> {
	type Error = HttpError;
	fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
		Self::try_from(bytes.to_vec())
	}
}
impl<E: Encoding> TryFrom<Vec<u8>> for Data<E> {
	type Error = HttpError;
	fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
		match Self::validate(&bytes) {
			true => Ok(Self{ bytes, _encoding: PhantomData }),
			false => Err(HttpError::InvalidEncoding)
		}
	}
}


impl<E: Encoding> From<Data<E>> for Vec<u8> {
	fn from(data: Data<E>) -> Self {
		data.bytes
	}
}
impl TryFrom<Data<Integer>> for u128 {
	type Error = ParseIntError;
	fn try_from(data: Data<Integer>) -> Result<Self, Self::Error> {
		Self::from_str_radix(data.as_ref(), 10)
	}
}
impl<'a> TryFrom<Data<Integer>> for u16 {
	type Error = ParseIntError;
	fn try_from(data: Data<Integer>) -> Result<Self, Self::Error> {
		Self::from_str_radix(data.as_ref(), 10)
	}
}