Struct cookie::CookieJar

pub struct CookieJar { /* fields omitted */ }

A collection of cookies that tracks its modifications.

A CookieJar provides storage for any number of cookies. Any changes made to the jar are tracked; the changes can be retrieved via the delta method which returns an interator over the changes.

Usage

A jar's life begins via new and calls to add_original:

use cookie::{Cookie, CookieJar};

let mut jar = CookieJar::new();
jar.add_original(Cookie::new("name", "value"));
jar.add_original(Cookie::new("second", "another"));

Cookies can be added via add and removed via remove. Finally, cookies can be looked up via get:

let mut jar = CookieJar::new();
jar.add(Cookie::new("a", "one"));
jar.add(Cookie::new("b", "two"));

assert_eq!(jar.get("a").map(|c| c.value()), Some("one"));
assert_eq!(jar.get("b").map(|c| c.value()), Some("two"));

jar.remove(Cookie::named("b"));
assert!(jar.get("b").is_none());

Deltas

A jar keeps track of any modifications made to it over time. The modifications are recorded as cookies. The modifications can be retrieved via delta. Any new Cookie added to a jar via add results in the same Cookie appearing in the delta; cookies added via add_original do not count towards the delta. Any original cookie that is removed from a jar results in a "removal" cookie appearing in the delta. A "removal" cookie is a cookie that a server sends so that the cookie is removed from the client's machine.

Deltas are typically used to create Set-Cookie headers corresponding to the changes made to a cookie jar over a period of time.

let mut jar = CookieJar::new();

// original cookies don't affect the delta
jar.add_original(Cookie::new("original", "value"));
assert_eq!(jar.delta().count(), 0);

// new cookies result in an equivalent `Cookie` in the delta
jar.add(Cookie::new("a", "one"));
jar.add(Cookie::new("b", "two"));
assert_eq!(jar.delta().count(), 2);

// removing an original cookie adds a "removal" cookie to the delta
jar.remove(Cookie::named("original"));
assert_eq!(jar.delta().count(), 3);

// removing a new cookie that was added removes that `Cookie` from the delta
jar.remove(Cookie::named("a"));
assert_eq!(jar.delta().count(), 2);

Methods

impl CookieJar

pub fn new() -> CookieJar

Creates an empty cookie jar.

Example

use cookie::CookieJar;

let jar = CookieJar::new();
assert_eq!(jar.iter().count(), 0);

pub fn get(&self, name: &str) -> Option<&Cookie<'static>>

Returns a reference to the Cookie inside this jar with the name name. If no such cookie exists, returns None.

Example

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();
assert!(jar.get("name").is_none());

jar.add(Cookie::new("name", "value"));
assert_eq!(jar.get("name").map(|c| c.value()), Some("value"));

pub fn add_original(&mut self, cookie: Cookie<'static>)

Adds an "original" cookie to this jar. Adding an original cookie does not affect the delta computation. This method is intended to be used to seed the cookie jar with cookies received from a client's HTTP message.

For accurate delta computations, this method should not be called after calling remove.

Example

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();
jar.add_original(Cookie::new("name", "value"));
jar.add_original(Cookie::new("second", "two"));

assert_eq!(jar.get("name").map(|c| c.value()), Some("value"));
assert_eq!(jar.get("second").map(|c| c.value()), Some("two"));
assert_eq!(jar.iter().count(), 2);
assert_eq!(jar.delta().count(), 0);

pub fn add(&mut self, cookie: Cookie<'static>)

Adds cookie to this jar.

Example

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();
jar.add(Cookie::new("name", "value"));
jar.add(Cookie::new("second", "two"));

assert_eq!(jar.get("name").map(|c| c.value()), Some("value"));
assert_eq!(jar.get("second").map(|c| c.value()), Some("two"));
assert_eq!(jar.iter().count(), 2);
assert_eq!(jar.delta().count(), 2);

pub fn remove(&mut self, cookie: Cookie<'static>)

Removes cookie from this jar. If an original cookie with the same name as cookie is present in the jar, a removal cookie will be present in the delta computation. To properly generate the removal cookie, cookie must contain the same path and domain as the cookie that was initially set.

A "removal" cookie is a cookie that has the same name as the original cookie but has an empty value, a max-age of 0, and an expiration date far in the past.

Example

Removing an original cookie results in a removal cookie:

extern crate time;

use cookie::{CookieJar, Cookie};
use time::Duration;

let mut jar = CookieJar::new();

// Assume this cookie originally had a path of "/" and domain of "a.b".
jar.add_original(Cookie::new("name", "value"));

// If the path and domain were set, they must be provided to `remove`.
jar.remove(Cookie::build("name", "").path("/").domain("a.b").finish());

// The delta will contain the removal cookie.
let delta: Vec<_> = jar.delta().collect();
assert_eq!(delta.len(), 1);
assert_eq!(delta[0].name(), "name");
assert_eq!(delta[0].max_age(), Some(Duration::seconds(0)));

Removing a new cookie does not result in a removal cookie:

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();
jar.add(Cookie::new("name", "value"));
assert_eq!(jar.delta().count(), 1);

jar.remove(Cookie::named("name"));
assert_eq!(jar.delta().count(), 0);

pub fn clear(&mut self)

Deprecated since 0.7.0

: calling this method may not remove all cookies since the path and domain are not specified; use remove instead

Removes all cookies from this cookie jar.

Important traits for Delta<'a>

impl<'a> Iterator for Delta<'a> type Item = &'a Cookie<'static>;

pub fn delta(&self) -> Delta

Returns an iterator over cookies that represent the changes to this jar over time. These cookies can be rendered directly as Set-Cookie header values to affect the changes made to this jar on the client.

Example

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();
jar.add_original(Cookie::new("name", "value"));
jar.add_original(Cookie::new("second", "two"));

// Add new cookies.
jar.add(Cookie::new("new", "third"));
jar.add(Cookie::new("another", "fourth"));
jar.add(Cookie::new("yac", "fifth"));

// Remove some cookies.
jar.remove(Cookie::named("name"));
jar.remove(Cookie::named("another"));

// Delta contains two new cookies ("new", "yac") and a removal ("name").
assert_eq!(jar.delta().count(), 3);

Important traits for Iter<'a>

impl<'a> Iterator for Iter<'a> type Item = &'a Cookie<'static>;

pub fn iter(&self) -> Iter

Returns an iterator over all of the cookies present in this jar.

Example

use cookie::{CookieJar, Cookie};

let mut jar = CookieJar::new();

jar.add_original(Cookie::new("name", "value"));
jar.add_original(Cookie::new("second", "two"));

jar.add(Cookie::new("new", "third"));
jar.add(Cookie::new("another", "fourth"));
jar.add(Cookie::new("yac", "fifth"));

jar.remove(Cookie::named("name"));
jar.remove(Cookie::named("another"));

// There are three cookies in the jar: "second", "new", and "yac".
for cookie in jar.iter() {
    match cookie.name() {
        "second" => assert_eq!(cookie.value(), "two"),
        "new" => assert_eq!(cookie.value(), "third"),
        "yac" => assert_eq!(cookie.value(), "fifth"),
        _ => unreachable!("there are only three cookies in the jar")
    }
}

pub fn private(&mut self, key: &Key) -> PrivateJar

Returns a PrivateJar with self as its parent jar using the key key to sign/encrypt and verify/decrypt cookies added/retrieved from the child jar.

Any modifications to the child jar will be reflected on the parent jar, and any retrievals from the child jar will be made from the parent jar.

This method is only available when the secure feature is enabled.

Example

use cookie::{Cookie, CookieJar, Key};

// Generate a secure key.
let key = Key::generate();

// Add a private (signed + encrypted) cookie.
let mut jar = CookieJar::new();
jar.private(&key).add(Cookie::new("private", "text"));

// The cookie's contents are encrypted.
assert_ne!(jar.get("private").unwrap().value(), "text");

// They can be decrypted and verified through the child jar.
assert_eq!(jar.private(&key).get("private").unwrap().value(), "text");

// A tampered with cookie does not validate but still exists.
let mut cookie = jar.get("private").unwrap().clone();
jar.add(Cookie::new("private", cookie.value().to_string() + "!"));
assert!(jar.private(&key).get("private").is_none());
assert!(jar.get("private").is_some());

pub fn signed(&mut self, key: &Key) -> SignedJar

Returns a SignedJar with self as its parent jar using the key key to sign/verify cookies added/retrieved from the child jar.

Any modifications to the child jar will be reflected on the parent jar, and any retrievals from the child jar will be made from the parent jar.

This method is only available when the secure feature is enabled.

Example

use cookie::{Cookie, CookieJar, Key};

// Generate a secure key.
let key = Key::generate();

// Add a signed cookie.
let mut jar = CookieJar::new();
jar.signed(&key).add(Cookie::new("signed", "text"));

// The cookie's contents are signed but still in plaintext.
assert_ne!(jar.get("signed").unwrap().value(), "text");
assert!(jar.get("signed").unwrap().value().contains("text"));

// They can be verified through the child jar.
assert_eq!(jar.signed(&key).get("signed").unwrap().value(), "text");

// A tampered with cookie does not validate but still exists.
let mut cookie = jar.get("signed").unwrap().clone();
jar.add(Cookie::new("signed", cookie.value().to_string() + "!"));
assert!(jar.signed(&key).get("signed").is_none());
assert!(jar.get("signed").is_some());

Trait Implementations

impl Default for CookieJar

fn default() -> CookieJar

Returns the "default value" for a type.

impl Clone for CookieJar

fn clone(&self) -> CookieJar

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CookieJar

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.