vercel_lambda 0.2.0

Rust bindings for Vercel Lambdas
Documentation 
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//! Provides a Vercel Lambda oriented request and response body entity interface

use std::{borrow::Cow, ops::Deref, str};

use base64::display::Base64Display;
use serde::ser::{Error as SerError, Serialize, Serializer};

/// Representation of http request and response bodies as supported
/// by Vercel.
///
/// These come in three flavors
/// * `Empty` ( no body )
/// * `Text` ( text data )
/// * `Binary` ( binary data )
///
/// Body types can be `Deref` and `AsRef`'d into `[u8]` types much like the `hyper` crate
///
/// # Examples
///
/// Body types are inferred with `From` implementations.
///
/// ## Text
///
/// Types like `String`, `str` whose type reflects
/// text produce `Body::Text` variants
///
/// ```
/// assert!(match vercel_lambda::Body::from("text") {
///   vercel_lambda::Body::Text(_) => true,
///   _ => false
/// })
/// ```
///
/// ## Binary
///
/// Types like `Vec<u8>` and `&[u8]` whose types reflect raw bytes produce `Body::Binary` variants
///
/// ```
/// assert!(match vercel_lambda::Body::from("text".as_bytes()) {
///   vercel_lambda::Body::Binary(_) => true,
///   _ => false
/// })
/// ```
///
/// `Binary` responses bodies will automatically get base64 encoded.
///
/// ## Empty
///
/// The unit type ( `()` ) whose type represents an empty value produces `Body::Empty` variants
///
/// ```
/// assert!(match vercel_lambda::Body::from(()) {
///   vercel_lambda::Body::Empty => true,
///   _ => false
/// })
/// ```
#[derive(Debug, PartialEq)]
pub enum Body {
	/// An empty body
	Empty,
	/// A body containing string data
	Text(String),
	/// A body containing binary data
	Binary(Vec<u8>),
}

impl Default for Body {
	fn default() -> Self {
		Body::Empty
	}
}

impl From<()> for Body {
	fn from(_: ()) -> Self {
		Body::Empty
	}
}

impl From<Body> for () {
	fn from(_: Body) -> Self {}
}

impl<'a> From<&'a str> for Body {
	fn from(s: &'a str) -> Self {
		Body::Text(s.into())
	}
}

impl From<String> for Body {
	fn from(b: String) -> Self {
		Body::Text(b)
	}
}
impl From<Body> for String {
	fn from(b: Body) -> String {
		match b {
			Body::Empty => String::from(""),
			Body::Text(t) => t,
			Body::Binary(b) => str::from_utf8(&b).unwrap().to_owned(),
		}
	}
}

impl From<Cow<'static, str>> for Body {
	#[inline]
	fn from(cow: Cow<'static, str>) -> Body {
		match cow {
			Cow::Borrowed(b) => Body::from(b.to_owned()),
			Cow::Owned(o) => Body::from(o),
		}
	}
}

impl From<Body> for Cow<'static, str> {
	#[inline]
	fn from(b: Body) -> Cow<'static, str> {
		Cow::Owned(String::from(b))
	}
}

impl From<Cow<'static, [u8]>> for Body {
	#[inline]
	fn from(cow: Cow<'static, [u8]>) -> Body {
		match cow {
			Cow::Borrowed(b) => Body::from(b),
			Cow::Owned(o) => Body::from(o),
		}
	}
}

impl From<Body> for Cow<'static, [u8]> {
	#[inline]
	fn from(b: Body) -> Self {
		Cow::Owned(b.as_ref().to_owned())
	}
}

impl From<Vec<u8>> for Body {
	fn from(b: Vec<u8>) -> Self {
		Body::Binary(b)
	}
}

impl From<Body> for Vec<u8> {
	fn from(b: Body) -> Self {
		match b {
			Body::Empty => "".as_bytes().to_owned(),
			Body::Text(t) => t.into_bytes(),
			Body::Binary(b) => b,
		}
	}
}

impl<'a> From<&'a [u8]> for Body {
	fn from(b: &'a [u8]) -> Self {
		Body::Binary(b.to_vec())
	}
}

impl Deref for Body {
	type Target = [u8];

	#[inline]
	fn deref(&self) -> &Self::Target {
		self.as_ref()
	}
}

impl AsRef<[u8]> for Body {
	#[inline]
	fn as_ref(&self) -> &[u8] {
		match self {
			Body::Empty => &[],
			Body::Text(ref bytes) => bytes.as_ref(),
			Body::Binary(ref bytes) => bytes.as_ref(),
		}
	}
}

impl<'a> Serialize for Body {
	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
	where
		S: Serializer,
	{
		match self {
			Body::Text(data) => serializer
				.serialize_str(::std::str::from_utf8(data.as_ref()).map_err(S::Error::custom)?),
			Body::Binary(data) => {
				serializer.collect_str(&Base64Display::with_config(data, base64::STANDARD))
			}
			Body::Empty => serializer.serialize_unit(),
		}
	}
}