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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! An implementation of the [CORS preflight cache](https://fetch.spec.whatwg.org/#cors-preflight-cache)
//! For now this library is XHR-specific.
//! For stuff involving `<img>`, `<iframe>`, `<form>`, etc please check what
//! the request mode should be and compare with the fetch spec
//! This library will eventually become the core of the Fetch crate
//! with CORSRequest being expanded into FetchRequest (etc)
use hyper::method::Method;
use net_traits::request::{CredentialsMode, Origin, Request};
use servo_url::ServoUrl;
use time::{self, Timespec};
/// Union type for CORS cache entries
///
/// Each entry might pertain to a header or method
#[derive(Clone, Debug)]
pub enum HeaderOrMethod {
HeaderData(String),
MethodData(Method)
}
impl HeaderOrMethod {
fn match_header(&self, header_name: &str) -> bool {
match *self {
HeaderOrMethod::HeaderData(ref s) => (&**s).eq_ignore_ascii_case(header_name),
_ => false
}
}
fn match_method(&self, method: &Method) -> bool {
match *self {
HeaderOrMethod::MethodData(ref m) => m == method,
_ => false
}
}
}
/// An entry in the CORS cache
#[derive(Clone, Debug)]
pub struct CorsCacheEntry {
pub origin: Origin,
pub url: ServoUrl,
pub max_age: u32,
pub credentials: bool,
pub header_or_method: HeaderOrMethod,
created: Timespec
}
impl CorsCacheEntry {
fn new(origin: Origin, url: ServoUrl, max_age: u32, credentials: bool,
header_or_method: HeaderOrMethod) -> CorsCacheEntry {
CorsCacheEntry {
origin: origin,
url: url,
max_age: max_age,
credentials: credentials,
header_or_method: header_or_method,
created: time::now().to_timespec()
}
}
}
fn match_headers(cors_cache: &CorsCacheEntry, cors_req: &Request) -> bool {
cors_cache.origin == cors_req.origin &&
cors_cache.url == cors_req.current_url() &&
(cors_cache.credentials || cors_req.credentials_mode != CredentialsMode::Include)
}
/// A simple, vector-based CORS Cache
#[derive(Clone)]
pub struct CorsCache(Vec<CorsCacheEntry>);
impl CorsCache {
pub fn new() -> CorsCache {
CorsCache(vec![])
}
fn find_entry_by_header<'a>(&'a mut self, request: &Request,
header_name: &str) -> Option<&'a mut CorsCacheEntry> {
self.cleanup();
self.0.iter_mut().find(|e| match_headers(e, request) && e.header_or_method.match_header(header_name))
}
fn find_entry_by_method<'a>(&'a mut self, request: &Request,
method: Method) -> Option<&'a mut CorsCacheEntry> {
// we can take the method from CorSRequest itself
self.cleanup();
self.0.iter_mut().find(|e| match_headers(e, request) && e.header_or_method.match_method(&method))
}
/// [Clear the cache](https://fetch.spec.whatwg.org/#concept-cache-clear)
pub fn clear(&mut self, request: &Request) {
let CorsCache(buf) = self.clone();
let new_buf: Vec<CorsCacheEntry> =
buf.into_iter().filter(|e| e.origin == request.origin &&
request.current_url() == e.url).collect();
*self = CorsCache(new_buf);
}
/// Remove old entries
pub fn cleanup(&mut self) {
let CorsCache(buf) = self.clone();
let now = time::now().to_timespec();
let new_buf: Vec<CorsCacheEntry> = buf.into_iter()
.filter(|e| now.sec < e.created.sec + e.max_age as i64)
.collect();
*self = CorsCache(new_buf);
}
/// Returns true if an entry with a
/// [matching header](https://fetch.spec.whatwg.org/#concept-cache-match-header) is found
pub fn match_header(&mut self, request: &Request, header_name: &str) -> bool {
self.find_entry_by_header(&request, header_name).is_some()
}
/// Updates max age if an entry for a
/// [matching header](https://fetch.spec.whatwg.org/#concept-cache-match-header) is found.
///
/// If not, it will insert an equivalent entry
pub fn match_header_and_update(&mut self, request: &Request,
header_name: &str, new_max_age: u32) -> bool {
match self.find_entry_by_header(&request, header_name).map(|e| e.max_age = new_max_age) {
Some(_) => true,
None => {
self.insert(CorsCacheEntry::new(request.origin.clone(), request.current_url(), new_max_age,
request.credentials_mode == CredentialsMode::Include,
HeaderOrMethod::HeaderData(header_name.to_owned())));
false
}
}
}
/// Returns true if an entry with a
/// [matching method](https://fetch.spec.whatwg.org/#concept-cache-match-method) is found
pub fn match_method(&mut self, request: &Request, method: Method) -> bool {
self.find_entry_by_method(&request, method).is_some()
}
/// Updates max age if an entry for
/// [a matching method](https://fetch.spec.whatwg.org/#concept-cache-match-method) is found.
///
/// If not, it will insert an equivalent entry
pub fn match_method_and_update(&mut self, request: &Request, method: Method, new_max_age: u32) -> bool {
match self.find_entry_by_method(&request, method.clone()).map(|e| e.max_age = new_max_age) {
Some(_) => true,
None => {
self.insert(CorsCacheEntry::new(request.origin.clone(), request.current_url(), new_max_age,
request.credentials_mode == CredentialsMode::Include,
HeaderOrMethod::MethodData(method)));
false
}
}
}
/// Insert an entry
pub fn insert(&mut self, entry: CorsCacheEntry) {
self.cleanup();
self.0.push(entry);
}
}
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