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//! Provides the [`SputnikParts`] trait.
use cookie::Cookie;
use mime::Mime;
use serde::de::DeserializeOwned;
use time::Duration;
use std::{collections::HashMap, sync::Arc};
use crate::response::{SputnikHeaders, delete_cookie};
use crate::http::{HeaderMap, header, request::Parts};
/// Adds convenience methods to [`http::request::Parts`](Parts).
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>;
/// A map of response headers to allow methods of this trait to set response
/// headers without needing to take a [`Response`](crate::http::response::Response) as an argument.
///
/// You need to take care to append these headers to the response yourself.
/// This is intended to be done after your routing logic so that your
/// individual request handlers don't have to worry about it.
fn response_headers(&mut self) -> &mut HeaderMap;
}
impl SputnikParts for Parts {
fn query<T: DeserializeOwned>(&self) -> Result<T,QueryError> {
serde_urlencoded::from_str::<T>(self.uri.query().unwrap_or("")).map_err(QueryError)
}
fn response_headers(&mut self) -> &mut HeaderMap {
if self.extensions.get::<HeaderMap>().is_none() {
self.extensions.insert(HeaderMap::new());
}
self.extensions.get_mut::<HeaderMap>().unwrap()
}
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()))})
}
}
const FLASH_COOKIE_NAME: &str = "flash";
/// Show the user a message after redirecting them.
pub struct Flash {
name: String,
message: String,
}
impl From<Flash> for Cookie<'_> {
fn from(flash: Flash) -> Self {
Cookie::build(FLASH_COOKIE_NAME, format!("{}:{}", flash.name, flash.message))
.max_age(Duration::minutes(5)).finish()
}
}
impl Flash {
/// If the request has a flash cookie retrieve it and append a set-cookie
/// header to delete the cookie to [`SputnikParts::response_headers`].
pub fn from_request(req: &mut Parts) -> Option<Self> {
req.cookies().get(FLASH_COOKIE_NAME)
.and_then(|cookie| {
req.response_headers().set_cookie(delete_cookie(FLASH_COOKIE_NAME));
let mut iter = cookie.value().splitn(2, ':');
if let (Some(name), Some(message)) = (iter.next(), iter.next()) {
return Some(Flash{name: name.to_owned(), message: message.to_owned()})
}
None
})
}
/// Constructs a new Flash message. The name must not contain a colon (`:`).
pub fn new(name: String, message: String) -> Self {
Flash{name, message}
}
/// Constructs a new "success" Flash message.
pub fn success(message: String) -> Self {
Flash{name: "success".to_owned(), message}
}
/// Constructs a new "warning" Flash message.
pub fn warning(message: String) -> Self {
Flash{name: "warning".to_owned(), message}
}
/// Constructs a new "error" Flash message.
pub fn error(message: String) -> Self {
Flash{name: "error".to_owned(), message}
}
/// Returns the name of the Flash message.
pub fn name(&self) -> &str {
&self.name
}
/// Returns the message of the Flash message.
pub fn message(&self) -> &str {
&self.message
}
}
#[derive(thiserror::Error, Debug)]
#[error("query deserialize error: {0}")]
pub struct QueryError(pub serde_urlencoded::de::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>,
}
#[cfg(test)]
mod tests {
use std::convert::TryInto;
use crate::http::{Request, header};
use super::SputnikParts;
#[test]
fn test_enforce_content_type() {
let (mut parts, _body) = Request::new("").into_parts();
assert!(parts.enforce_content_type(mime::APPLICATION_JSON).is_err());
parts.headers.append(header::CONTENT_TYPE, "application/json".try_into().unwrap());
assert!(parts.enforce_content_type(mime::APPLICATION_JSON).is_ok());
parts.headers.insert(header::CONTENT_TYPE, "text/html".try_into().unwrap());
assert!(parts.enforce_content_type(mime::APPLICATION_JSON).is_err());
}
}
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