mirror of https://github.com/rwf2/Rocket.git
601 lines
19 KiB
Rust
601 lines
19 KiB
Rust
use std::fmt;
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use parking_lot::Mutex;
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use crate::Header;
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pub use cookie::{Cookie, SameSite, Iter};
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#[doc(hidden)] pub use self::key::*;
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/// Types and methods to manage a `Key` when private cookies are enabled.
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#[cfg(feature = "private-cookies")]
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mod key {
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pub use cookie::Key;
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}
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/// Types and methods to manage a `Key` when private cookies are disabled.
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#[cfg(not(feature = "private-cookies"))]
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mod key {
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#[derive(Copy, Clone)]
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pub struct Key;
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impl Key {
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pub fn from(_: &[u8]) -> Self { Key }
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pub fn derive_from(_: &[u8]) -> Self { Key }
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pub fn generate() -> Self { Key }
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pub fn try_generate() -> Option<Self> { Some(Key) }
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pub fn master(&self) -> &[u8] {
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static ZERO: &'static [u8; 64] = &[0; 64];
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&ZERO[..]
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}
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}
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impl PartialEq for Key {
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fn eq(&self, _: &Self) -> bool {
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true
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}
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}
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}
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/// Collection of one or more HTTP cookies.
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///
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/// `CookieJar` allows for retrieval of cookies from an incoming request. It
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/// also tracks modifications (additions and removals) and marks them as
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/// pending.
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///
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/// # Pending
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///
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/// Changes to a `CookieJar` are _not_ visible via the normal [`get()`] and
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/// [`get_private()`] methods. This is typically the desired effect as a
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/// `CookieJar` always reflects the cookies in an incoming request. In cases
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/// where this is not desired, the [`get_pending()`] and
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/// [`get_private_pending()`] methods are available, which always return the
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/// latest changes.
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{CookieJar, Cookie};
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///
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/// #[get("/message")]
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/// fn message(jar: &CookieJar<'_>) {
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/// jar.add(Cookie::new("message", "hello!"));
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/// jar.add(Cookie::new("other", "bye!"));
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///
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/// // `get()` does not reflect changes.
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/// assert!(jar.get("other").is_none());
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/// # assert_eq!(jar.get("message").map(|c| c.value()), Some("hi"));
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///
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/// // `get_pending()` does.
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/// let other_pending = jar.get_pending("other");
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/// let message_pending = jar.get_pending("message");
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/// assert_eq!(other_pending.as_ref().map(|c| c.value()), Some("bye!"));
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/// assert_eq!(message_pending.as_ref().map(|c| c.value()), Some("hello!"));
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/// # jar.remove(Cookie::named("message"));
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/// # assert_eq!(jar.get("message").map(|c| c.value()), Some("hi"));
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/// # assert!(jar.get_pending("message").is_none());
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/// }
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/// # fn main() {
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/// # use rocket::local::blocking::Client;
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/// # let rocket = rocket::ignite().mount("/", routes![message]);
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/// # let client = Client::tracked(rocket).unwrap();
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/// # let response = client.get("/message")
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/// # .cookie(Cookie::new("message", "hi"))
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/// # .dispatch();
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/// #
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/// # assert!(response.status().class().is_success());
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/// # }
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/// ```
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///
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/// # Usage
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///
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/// A type of `&CookieJar` can be retrieved via its `FromRequest` implementation
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/// as a request guard or via the [`Request::cookies()`] method. Individual
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/// cookies can be retrieved via the [`get()`] and [`get_private()`] methods.
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/// Pending changes can be observed via the [`get_pending()`] and
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/// [`get_private_pending()`] methods. Cookies can be added or removed via the
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/// [`add()`], [`add_private()`], [`remove()`], and [`remove_private()`]
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/// methods.
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///
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/// [`Request::cookies()`]: rocket::Request::cookies()
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/// [`get()`]: #method.get
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/// [`get_private()`]: #method.get_private
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/// [`get_pending()`]: #method.get_pending
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/// [`get_private_pending()`]: #method.get_private_pending
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/// [`add()`]: #method.add
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/// [`add_private()`]: #method.add_private
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/// [`remove()`]: #method.remove
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/// [`remove_private()`]: #method.remove_private
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///
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/// ## Examples
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///
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/// The following example shows `&CookieJar` being used as a request guard in a
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/// handler to retrieve the value of a "message" cookie.
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::CookieJar;
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///
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/// #[get("/message")]
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/// fn message<'a>(jar: &'a CookieJar<'_>) -> Option<&'a str> {
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/// jar.get("message").map(|cookie| cookie.value())
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/// }
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/// # fn main() { }
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/// ```
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///
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/// The following snippet shows `&CookieJar` being retrieved from a `Request` in
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/// a custom request guard implementation for `User`. A [private cookie]
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/// containing a user's ID is retrieved. If the cookie exists and the ID parses
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/// as an integer, a `User` structure is validated. Otherwise, the guard
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/// forwards.
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///
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/// [private cookie]: #method.add_private
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// # #[cfg(feature = "private-cookies")] {
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/// use rocket::http::Status;
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/// use rocket::outcome::IntoOutcome;
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/// use rocket::request::{self, Request, FromRequest};
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///
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/// // In practice, we'd probably fetch the user from the database.
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/// struct User(usize);
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///
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/// #[rocket::async_trait]
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/// impl<'a, 'r> FromRequest<'a, 'r> for User {
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/// type Error = std::convert::Infallible;
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///
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/// async fn from_request(request: &'a Request<'r>) -> request::Outcome<Self, Self::Error> {
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/// request.cookies()
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/// .get_private("user_id")
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/// .and_then(|c| c.value().parse().ok())
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/// .map(|id| User(id))
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/// .or_forward(())
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/// }
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/// }
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/// # }
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/// # fn main() { }
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/// ```
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///
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/// # Private Cookies
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///
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/// _Private_ cookies are just like regular cookies except that they are
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/// encrypted using authenticated encryption, a form of encryption which
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/// simultaneously provides confidentiality, integrity, and authenticity. This
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/// means that private cookies cannot be inspected, tampered with, or
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/// manufactured by clients. If you prefer, you can think of private cookies as
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/// being signed and encrypted.
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///
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/// Private cookies can be retrieved, added, and removed from a `CookieJar`
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/// collection via the [`get_private()`], [`add_private()`], and
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/// [`remove_private()`] methods.
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///
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/// ## Encryption Key
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///
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/// To encrypt private cookies, Rocket uses the 256-bit key specified in the
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/// `secret_key` configuration parameter. If one is not specified, Rocket will
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/// automatically generate a fresh key. Note, however, that a private cookie can
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/// only be decrypted with the same key with which it was encrypted. As such, it
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/// is important to set a `secret_key` configuration parameter when using
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/// private cookies so that cookies decrypt properly after an application
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/// restart. Rocket will emit a warning if an application is run in production
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/// mode without a configured `secret_key`.
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///
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/// Generating a string suitable for use as a `secret_key` configuration value
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/// is usually done through tools like `openssl`. Using `openssl`, for instance,
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/// a 256-bit base64 key can be generated with the command `openssl rand -base64
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/// 32`.
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pub struct CookieJar<'a> {
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jar: cookie::CookieJar,
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key: &'a Key,
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ops: Mutex<Vec<Op>>,
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}
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impl<'a> Clone for CookieJar<'a> {
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fn clone(&self) -> Self {
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CookieJar {
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jar: self.jar.clone(),
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key: self.key,
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ops: Mutex::new(self.ops.lock().clone()),
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}
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}
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}
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#[derive(Clone)]
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enum Op {
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Add(Cookie<'static>, bool),
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Remove(Cookie<'static>, bool),
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}
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impl Op {
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fn cookie(&self) -> &Cookie<'static> {
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match self {
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Op::Add(c, _) | Op::Remove(c, _) => c
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}
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}
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}
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impl<'a> CookieJar<'a> {
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/// Returns a reference to the _original_ `Cookie` inside this container
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/// with the name `name`. If no such cookie exists, returns `None`.
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///
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/// **Note:** This method _does not_ obverse changes made via additions and
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/// removals to the cookie jar. To observe those changes, use
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/// [`CookieJar::get_pending()`].
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// let cookie = jar.get("name");
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/// }
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/// ```
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pub fn get(&self, name: &str) -> Option<&Cookie<'static>> {
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self.jar.get(name)
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}
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/// Retrives the _original_ `Cookie` inside this collection with the name
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/// `name` and authenticates and decrypts the cookie's value. If the cookie
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/// cannot be found, or the cookie fails to authenticate or decrypt, `None`
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/// is returned.
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///
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/// **Note:** This method _does not_ obverse changes made via additions and
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/// removals to the cookie jar. To observe those changes, use
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/// [`CookieJar::get_private_pending()`].
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// let cookie = jar.get_private("name");
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/// }
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/// ```
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#[cfg(feature = "private-cookies")]
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#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
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pub fn get_private(&self, name: &str) -> Option<Cookie<'static>> {
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self.jar.private(&*self.key).get(name)
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}
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/// Returns a reference to the _original or pending_ `Cookie` inside this
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/// container with the name `name`. If no such cookie exists, returns
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/// `None`.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// let pending_cookie = jar.get_pending("name");
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/// }
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/// ```
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pub fn get_pending(&self, name: &str) -> Option<Cookie<'static>> {
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let ops = self.ops.lock();
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for op in ops.iter().rev().filter(|op| op.cookie().name() == name) {
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match op {
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Op::Add(c, _) => return Some(c.clone()),
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Op::Remove(_, _) => return None,
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}
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}
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drop(ops);
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self.get(name).map(|c| c.clone())
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}
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/// Retrives the _original or pending_ `Cookie` inside this collection with
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/// the name `name` and authenticates and decrypts the cookie's value. If
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/// the cookie cannot be found, or the cookie fails to authenticate or
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/// decrypt, `None` is returned.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// let pending_cookie = jar.get_private_pending("name");
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/// }
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/// ```
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#[cfg(feature = "private-cookies")]
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#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
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pub fn get_private_pending(&self, name: &str) -> Option<Cookie<'static>> {
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let cookie = self.get_pending(name)?;
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self.jar.private(&*self.key).decrypt(cookie)
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}
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/// Adds `cookie` to this collection.
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///
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/// Unless a value is set for the given property, the following defaults are
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/// set on `cookie` before being added to `self`:
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///
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/// * `path`: `"/"`
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/// * `SameSite`: `Strict`
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, SameSite, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// jar.add(Cookie::new("first", "value"));
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///
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/// let cookie = Cookie::build("other", "value_two")
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/// .path("/")
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/// .secure(true)
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/// .same_site(SameSite::Lax);
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///
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/// jar.add(cookie.finish());
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/// }
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/// ```
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pub fn add(&self, mut cookie: Cookie<'static>) {
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Self::set_defaults(&mut cookie);
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self.ops.lock().push(Op::Add(cookie, false));
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}
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/// Adds `cookie` to the collection. The cookie's value is encrypted with
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/// authenticated encryption assuring confidentiality, integrity, and
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/// authenticity. The cookie can later be retrieved using
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/// [`get_private`](#method.get_private) and removed using
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/// [`remove_private`](#method.remove_private).
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///
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/// Unless a value is set for the given property, the following defaults are
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/// set on `cookie` before being added to `self`:
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///
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/// * `path`: `"/"`
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/// * `SameSite`: `Strict`
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/// * `HttpOnly`: `true`
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/// * `Expires`: 1 week from now
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///
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/// These defaults ensure maximum usability and security. For additional
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/// security, you may wish to set the `secure` flag.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// jar.add_private(Cookie::new("name", "value"));
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/// }
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/// ```
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#[cfg(feature = "private-cookies")]
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#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
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pub fn add_private(&self, mut cookie: Cookie<'static>) {
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Self::set_private_defaults(&mut cookie);
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self.ops.lock().push(Op::Add(cookie, true));
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}
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/// Removes `cookie` from this collection and generates a "removal" cookies
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/// to send to the client on response. For correctness, `cookie` must
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/// contain the same `path` and `domain` as the cookie that was initially
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/// set. Failure to provide the initial `path` and `domain` will result in
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/// cookies that are not properly removed. For convenience, if a path is not
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/// set on `cookie`, the `"/"` path will automatically be set.
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///
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/// A "removal" cookie is a cookie that has the same name as the original
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/// cookie but has an empty value, a max-age of 0, and an expiration date
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/// far in the past.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// jar.remove(Cookie::named("name"));
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/// }
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/// ```
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pub fn remove(&self, mut cookie: Cookie<'static>) {
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if cookie.path().is_none() {
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cookie.set_path("/");
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}
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self.ops.lock().push(Op::Remove(cookie, false));
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}
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/// Removes the private `cookie` from the collection.
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///
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/// For correct removal, the passed in `cookie` must contain the same `path`
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/// and `domain` as the cookie that was initially set. If a path is not set
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/// on `cookie`, the `"/"` path will automatically be set.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// jar.remove_private(Cookie::named("name"));
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/// }
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/// ```
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#[cfg(feature = "private-cookies")]
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#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
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pub fn remove_private(&self, mut cookie: Cookie<'static>) {
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if cookie.path().is_none() {
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cookie.set_path("/");
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}
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self.ops.lock().push(Op::Remove(cookie, true));
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}
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/// Returns an iterator over all of the _original_ cookies present in this
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/// collection.
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///
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/// **Note:** This method _does not_ obverse changes made via additions and
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/// removals to the cookie jar.
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///
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/// # Example
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///
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/// ```rust
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/// # #[macro_use] extern crate rocket;
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/// use rocket::http::{Cookie, CookieJar};
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///
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/// #[get("/")]
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/// fn handler(jar: &CookieJar<'_>) {
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/// for c in jar.iter() {
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/// println!("Name: {:?}, Value: {:?}", c.name(), c.value());
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/// }
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/// }
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/// ```
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pub fn iter(&self) -> impl Iterator<Item=&Cookie<'static>> {
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self.jar.iter()
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}
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}
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/// WARNING: These are unstable! Do not use outside of Rocket!
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#[doc(hidden)]
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impl<'a> CookieJar<'a> {
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#[inline(always)]
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pub fn new(key: &'a Key) -> Self {
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CookieJar {
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jar: cookie::CookieJar::new(),
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key, ops: Mutex::new(Vec::new()),
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}
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}
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#[inline(always)]
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pub fn from(jar: cookie::CookieJar, key: &'a Key) -> CookieJar<'a> {
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CookieJar { jar, key, ops: Mutex::new(Vec::new()) }
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}
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/// Removes all delta cookies.
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#[inline(always)]
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pub fn reset_delta(&self) {
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self.ops.lock().clear();
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}
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/// TODO: This could be faster by just returning the cookies directly via
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/// an ordered hash-set of sorts.
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#[inline(always)]
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pub fn take_delta_jar(&self) -> cookie::CookieJar {
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let ops = std::mem::replace(&mut *self.ops.lock(), Vec::new());
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let mut jar = cookie::CookieJar::new();
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for op in ops {
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match op {
|
|
Op::Add(c, false) => jar.add(c),
|
|
#[cfg(feature = "private-cookies")]
|
|
Op::Add(c, true) => jar.private_mut(self.key).add(c),
|
|
Op::Remove(mut c, _) => {
|
|
if self.jar.get(c.name()).is_some() {
|
|
c.make_removal();
|
|
jar.add(c);
|
|
} else {
|
|
jar.remove(c);
|
|
}
|
|
}
|
|
#[allow(unreachable_patterns)]
|
|
_ => unreachable!()
|
|
}
|
|
}
|
|
|
|
jar
|
|
}
|
|
|
|
/// Adds an original `cookie` to this collection.
|
|
#[inline(always)]
|
|
pub fn add_original(&mut self, cookie: Cookie<'static>) {
|
|
self.jar.add_original(cookie)
|
|
}
|
|
|
|
/// Adds an original, private `cookie` to the collection.
|
|
#[inline(always)]
|
|
#[cfg(feature = "private-cookies")]
|
|
#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
|
|
pub fn add_original_private(&mut self, cookie: Cookie<'static>) {
|
|
self.jar.private_mut(&*self.key).add_original(cookie);
|
|
}
|
|
|
|
/// For each property mentioned below, this method checks if there is a
|
|
/// provided value and if there is none, sets a default value. Default
|
|
/// values are:
|
|
///
|
|
/// * `path`: `"/"`
|
|
/// * `SameSite`: `Strict`
|
|
///
|
|
fn set_defaults(cookie: &mut Cookie<'static>) {
|
|
if cookie.path().is_none() {
|
|
cookie.set_path("/");
|
|
}
|
|
|
|
if cookie.same_site().is_none() {
|
|
cookie.set_same_site(SameSite::Strict);
|
|
}
|
|
}
|
|
|
|
/// For each property mentioned below, this method checks if there is a
|
|
/// provided value and if there is none, sets a default value. Default
|
|
/// values are:
|
|
///
|
|
/// * `path`: `"/"`
|
|
/// * `SameSite`: `Strict`
|
|
/// * `HttpOnly`: `true`
|
|
/// * `Expires`: 1 week from now
|
|
///
|
|
#[cfg(feature = "private-cookies")]
|
|
#[cfg_attr(nightly, doc(cfg(feature = "secrets")))]
|
|
fn set_private_defaults(cookie: &mut Cookie<'static>) {
|
|
if cookie.path().is_none() {
|
|
cookie.set_path("/");
|
|
}
|
|
|
|
if cookie.same_site().is_none() {
|
|
cookie.set_same_site(SameSite::Strict);
|
|
}
|
|
|
|
if cookie.http_only().is_none() {
|
|
cookie.set_http_only(true);
|
|
}
|
|
|
|
if cookie.expires().is_none() {
|
|
cookie.set_expires(time::OffsetDateTime::now_utc() + time::Duration::weeks(1));
|
|
}
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for CookieJar<'_> {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
let pending: Vec<_> = self.ops.lock()
|
|
.iter()
|
|
.map(|c| c.cookie())
|
|
.cloned()
|
|
.collect();
|
|
|
|
f.debug_struct("CookieJar")
|
|
.field("original", &self.jar)
|
|
.field("pending", &pending)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
impl From<Cookie<'_>> for Header<'static> {
|
|
fn from(cookie: Cookie<'_>) -> Header<'static> {
|
|
Header::new("Set-Cookie", cookie.encoded().to_string())
|
|
}
|
|
}
|
|
|
|
impl From<&Cookie<'_>> for Header<'static> {
|
|
fn from(cookie: &Cookie<'_>) -> Header<'static> {
|
|
Header::new("Set-Cookie", cookie.encoded().to_string())
|
|
}
|
|
}
|