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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/. */
use crate::GLOBAL_SETTINGS;
use ffi::FfiBackend;
use once_cell::sync::OnceCell;
mod ffi;
pub fn note_backend(which: &str) {
// If trace logs are enabled: log on every request. Otherwise, just log on
// the first request at `info` level. We remember if the Once was triggered
// to avoid logging twice in the first case.
static NOTE_BACKEND_ONCE: std::sync::Once = std::sync::Once::new();
let mut called = false;
NOTE_BACKEND_ONCE.call_once(|| {
log::info!("Using HTTP backend {}", which);
called = true;
});
if !called {
log::trace!("Using HTTP backend {}", which);
}
}
pub trait Backend: Send + Sync + 'static {
fn send(&self, request: crate::Request) -> Result<crate::Response, crate::Error>;
}
static BACKEND: OnceCell<&'static dyn Backend> = OnceCell::new();
pub fn set_backend(b: &'static dyn Backend) -> Result<(), crate::Error> {
BACKEND
.set(b)
.map_err(|_| crate::error::Error::SetBackendError)
}
pub(crate) fn get_backend() -> &'static dyn Backend {
*BACKEND.get_or_init(|| Box::leak(Box::new(FfiBackend)))
}
pub fn send(request: crate::Request) -> Result<crate::Response, crate::Error> {
validate_request(&request)?;
get_backend().send(request)
}
pub fn validate_request(request: &crate::Request) -> Result<(), crate::Error> {
if request.url.scheme() != "https"
&& match request.url.host() {
Some(url::Host::Domain(d)) => d != "localhost",
Some(url::Host::Ipv4(addr)) => !addr.is_loopback(),
Some(url::Host::Ipv6(addr)) => !addr.is_loopback(),
None => true,
}
&& {
let settings = GLOBAL_SETTINGS.read();
settings
.addn_allowed_insecure_url
.as_ref()
.map(|url| url.host() != request.url.host() || url.scheme() != request.url.scheme())
.unwrap_or(true)
}
{
return Err(crate::Error::NonTlsUrl);
}
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_validate_request() {
let _https_request = crate::Request::new(
crate::Method::Get,
url::Url::parse("https://www.example.com").unwrap(),
);
assert!(validate_request(&_https_request).is_ok());
let _http_request = crate::Request::new(
crate::Method::Get,
url::Url::parse("http://www.example.com").unwrap(),
);
assert!(validate_request(&_http_request).is_err());
let _localhost_https_request = crate::Request::new(
crate::Method::Get,
url::Url::parse("https://127.0.0.1/index.html").unwrap(),
);
assert!(validate_request(&_localhost_https_request).is_ok());
let _localhost_https_request_2 = crate::Request::new(
crate::Method::Get,
url::Url::parse("https://localhost:4242/").unwrap(),
);
assert!(validate_request(&_localhost_https_request_2).is_ok());
let _localhost_http_request = crate::Request::new(
crate::Method::Get,
url::Url::parse("http://localhost:4242/").unwrap(),
);
assert!(validate_request(&_localhost_http_request).is_ok());
let localhost_request = crate::Request::new(
crate::Method::Get,
url::Url::parse("localhost:4242/").unwrap(),
);
assert!(validate_request(&localhost_request).is_err());
let localhost_request_shorthand_ipv6 =
crate::Request::new(crate::Method::Get, url::Url::parse("http://[::1]").unwrap());
assert!(validate_request(&localhost_request_shorthand_ipv6).is_ok());
let localhost_request_ipv6 = crate::Request::new(
crate::Method::Get,
url::Url::parse("http://[0:0:0:0:0:0:0:1]").unwrap(),
);
assert!(validate_request(&localhost_request_ipv6).is_ok());
}
#[test]
fn test_validate_request_addn_allowed_insecure_url() {
let request_root = crate::Request::new(
crate::Method::Get,
url::Url::parse("http://anything").unwrap(),
);
let request = crate::Request::new(
crate::Method::Get,
url::Url::parse("http://anything/path").unwrap(),
);
// This should never be accepted.
let request_ftp = crate::Request::new(
crate::Method::Get,
url::Url::parse("ftp://anything/path").unwrap(),
);
assert!(validate_request(&request_root).is_err());
assert!(validate_request(&request).is_err());
{
let mut settings = GLOBAL_SETTINGS.write();
settings.addn_allowed_insecure_url =
Some(url::Url::parse("http://something-else").unwrap());
}
assert!(validate_request(&request_root).is_err());
assert!(validate_request(&request).is_err());
{
let mut settings = GLOBAL_SETTINGS.write();
settings.addn_allowed_insecure_url = Some(url::Url::parse("http://anything").unwrap());
}
assert!(validate_request(&request_root).is_ok());
assert!(validate_request(&request).is_ok());
assert!(validate_request(&request_ftp).is_err());
}
}
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