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//! Provides the [`SputnikParts`] and [`SputnikBody`] traits.
use cookie::Cookie;
use mime::Mime;
use serde::{Deserialize, de::DeserializeOwned};
use hyper::{body::Bytes, header, http::{request::Parts, response::Builder}};
use time::Duration;
use std::{collections::HashMap, sync::Arc};
use rand::{Rng, distributions::Alphanumeric};
use async_trait::async_trait;
use crate::response::SputnikBuilder;
const CSRF_COOKIE_NAME : &str = "csrf";
pub trait SputnikParts {
/// Parses the query string of the request into a given struct.
fn query<X: DeserializeOwned>(&self) -> Result<X,QueryError>;
/// Parses the cookies of the request.
fn cookies(&mut self) -> Arc<HashMap<String, Cookie<'static>>>;
/// Enforces a specific Content-Type.
fn enforce_content_type(&self, mime: Mime) -> Result<(), WrongContentTypeError>;
/// Retrievs the CSRF token from a cookie or generates
/// a new token and stores it as a cookie if it doesn't exist.
/// Returns a hidden HTML input to be embedded in forms that are received
/// with [`crate::request::SputnikBody::into_form_csrf`].
fn csrf_html_input(&mut self, builder: &mut Builder) -> String;
}
impl SputnikParts for hyper::http::request::Parts {
fn query<T: DeserializeOwned>(&self) -> Result<T,QueryError> {
serde_urlencoded::from_str::<T>(self.uri.query().unwrap_or("")).map_err(QueryError)
}
fn cookies(&mut self) -> Arc<HashMap<String, Cookie<'static>>> {
let cookies: Option<&Arc<HashMap<String, Cookie>>> = self.extensions.get();
if let Some(cookies) = cookies {
return cookies.clone();
}
let mut cookies = HashMap::new();
for header in self.headers.get_all(header::COOKIE) {
let raw_str = match std::str::from_utf8(header.as_bytes()) {
Ok(string) => string,
Err(_) => continue
};
for cookie_str in raw_str.split(';').map(|s| s.trim()) {
if let Ok(cookie) = Cookie::parse_encoded(cookie_str) {
cookies.insert(cookie.name().to_string(), cookie.into_owned());
}
}
}
let cookies = Arc::new(cookies);
self.extensions.insert(cookies.clone());
cookies
}
fn enforce_content_type(&self, mime: Mime) -> Result<(), WrongContentTypeError> {
if let Some(content_type) = self.headers.get(header::CONTENT_TYPE) {
if *content_type == mime.to_string() {
return Ok(())
}
}
Err(WrongContentTypeError{expected: mime, received: self.headers.get(header::CONTENT_TYPE).as_ref().and_then(|h| h.to_str().ok().map(|s| s.to_owned()))})
}
fn csrf_html_input(&mut self, builder: &mut Builder) -> String {
let token = csrf_token_from_cookies(self).unwrap_or_else(|| {
let token: String = rand::thread_rng().sample_iter(Alphanumeric).take(16).collect();
let mut c = Cookie::new(CSRF_COOKIE_NAME, token.clone());
c.set_secure(Some(true));
c.set_max_age(Some(Duration::hours(1)));
builder.set_cookie(c);
token
});
format!("<input name=csrf type=hidden value=\"{}\">", token)
}
}
#[async_trait]
pub trait SputnikBody {
async fn into_bytes(self) -> Result<Bytes, BodyError>;
/// Parses a `application/x-www-form-urlencoded` request body into a given struct.
///
/// This does make you vulnerable to CSRF, so you normally want to use
/// [`SputnikBody::into_form_csrf()`] instead.
async fn into_form<T: DeserializeOwned>(self) -> Result<T, FormError>;
/// Parses a `application/x-www-form-urlencoded` request body into a given struct.
/// Protects from CSRF by checking that the request body contains the same token retrieved from the cookies.
///
/// The HTML form must embed a hidden input generated with [`crate::request::SputnikParts::csrf_html_input`].
async fn into_form_csrf<T: DeserializeOwned>(self, req: &mut Parts) -> Result<T, CsrfProtectedFormError>;
}
fn csrf_token_from_cookies(req: &mut Parts) -> Option<String> {
req.cookies().get(CSRF_COOKIE_NAME).map(|c| c.value().to_string())
}
#[async_trait]
impl SputnikBody for hyper::Body {
async fn into_bytes(self) -> Result<Bytes, BodyError> {
hyper::body::to_bytes(self).await.map_err(BodyError)
}
async fn into_form<T: DeserializeOwned>(self) -> Result<T, FormError> {
let full_body = self.into_bytes().await?;
Ok(serde_urlencoded::from_bytes::<T>(&full_body)?)
}
async fn into_form_csrf<T: DeserializeOwned>(self, req: &mut Parts) -> Result<T, CsrfProtectedFormError> {
let full_body = self.into_bytes().await?;
let csrf_data = serde_urlencoded::from_bytes::<CsrfData>(&full_body).map_err(|_| CsrfProtectedFormError::NoCsrf)?;
match csrf_token_from_cookies(req) {
Some(token) => if token == csrf_data.csrf {
Ok(serde_urlencoded::from_bytes::<T>(&full_body)?)
} else {
Err(CsrfProtectedFormError::Mismatch)
}
None => Err(CsrfProtectedFormError::NoCookie)
}
}
}
#[derive(Deserialize)]
struct CsrfData {
csrf: String,
}
#[derive(thiserror::Error, Debug)]
#[error("query deserialize error: {0}")]
pub struct QueryError(pub serde_urlencoded::de::Error);
#[derive(thiserror::Error, Debug)]
#[error("failed to read body")]
pub struct BodyError(pub hyper::Error);
#[derive(thiserror::Error, Debug)]
#[error("expected Content-Type {expected} but received {}", received.as_ref().unwrap_or(&"nothing".to_owned()))]
pub struct WrongContentTypeError {
pub expected: Mime,
pub received: Option<String>,
}
#[derive(thiserror::Error, Debug)]
pub enum FormError {
#[error("{0}")]
Body(#[from] BodyError),
#[error("form deserialize error: {0}")]
Deserialize(#[from] serde_urlencoded::de::Error),
}
#[derive(thiserror::Error, Debug)]
pub enum CsrfProtectedFormError {
#[error("{0}")]
Body(#[from] BodyError),
#[error("form deserialize error: {0}")]
Deserialize(#[from] serde_urlencoded::de::Error),
#[error("no csrf token in form data")]
NoCsrf,
#[error("no csrf cookie")]
NoCookie,
#[error("csrf parameter doesn't match csrf cookie")]
Mismatch,
}
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