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//! ref: composer/src/Composer/Util/Http/ProxyManager.php
use crate::downloader::TransportException;
use crate::util::NoProxyPattern;
use crate::util::http::ProxyItem;
use crate::util::http::RequestProxy;
use std::sync::Mutex;
use std::sync::atomic::{AtomicU64, Ordering};
static INSTANCE: Mutex<Option<ProxyManager>> = Mutex::new(None);
// Distinguishes ProxyManager instances so tests can mirror PHP `===` identity of the singleton,
// which the Rust value-based singleton does not otherwise expose.
static NEXT_GENERATION: AtomicU64 = AtomicU64::new(0);
#[derive(Debug)]
pub struct ProxyManager {
error: Option<String>,
http_proxy: Option<ProxyItem>,
https_proxy: Option<ProxyItem>,
no_proxy_handler: std::cell::RefCell<Option<NoProxyPattern>>,
generation: u64,
}
impl ProxyManager {
fn new() -> Self {
let mut instance = Self {
error: None,
http_proxy: None,
https_proxy: None,
no_proxy_handler: std::cell::RefCell::new(None),
generation: NEXT_GENERATION.fetch_add(1, Ordering::Relaxed),
};
if let Err(e) = instance.get_proxy_data() {
instance.error = Some(e.to_string());
}
instance
}
// Returns the singleton already locked, rather than the bare `Mutex`, so that ensuring the
// instance is constructed and reading it happen under a single lock. Returning the `Mutex`
// itself would let a caller's own separate `.lock()` race a concurrent `reset()` in the gap
// between the two locks.
pub fn get_instance() -> std::sync::MutexGuard<'static, Option<ProxyManager>> {
// Mirrors PHP `getInstance`'s `if (self::$instance === null) { self::$instance = new self(); }`:
// construction is lazy, so it observes the environment at first use after a `reset`
// rather than at `reset` time.
let mut guard = INSTANCE.lock().unwrap();
if guard.is_none() {
*guard = Some(ProxyManager::new());
}
guard
}
/// Clears the persistent instance (mirrors PHP `ProxyManager::reset`, which sets
/// `self::$instance = null` rather than eagerly reconstructing it).
pub fn reset() {
*INSTANCE.lock().unwrap() = None;
}
/// For testing only: a unique id per constructed instance, used to mirror PHP `===` identity
/// comparison of the ProxyManager singleton across `get_instance`/`reset`.
pub fn __generation(&self) -> u64 {
self.generation
}
pub fn has_proxy(&self) -> bool {
self.http_proxy.is_some() || self.https_proxy.is_some()
}
pub fn get_proxy_for_request(
&self,
request_url: &str,
) -> Result<RequestProxy, TransportException> {
if let Some(ref error) = self.error {
return Err(TransportException::new(
format!("Unable to use a proxy: {}", error),
0,
));
}
let scheme = request_url.split("://").next().unwrap_or("").to_string();
let proxy = self.get_proxy_for_scheme(&scheme);
if proxy.is_none() {
return Ok(RequestProxy::none());
}
if self.no_proxy(request_url) {
return Ok(RequestProxy::no_proxy());
}
Ok(proxy.unwrap().to_request_proxy(scheme))
}
fn get_proxy_for_scheme(&self, scheme: &str) -> Option<&ProxyItem> {
if scheme == "http" {
return self.http_proxy.as_ref();
}
if scheme == "https" {
return self.https_proxy.as_ref();
}
None
}
fn get_proxy_data(&mut self) -> anyhow::Result<()> {
// handle http_proxy/HTTP_PROXY on CLI only for security reasons
// PHP_SAPI is always 'cli' for this application
let (env, name) = Self::get_proxy_env("http_proxy");
if let Some(env) = env {
self.http_proxy = Some(ProxyItem::new(env, name)?);
}
if self.http_proxy.is_none() {
let (env, name) = Self::get_proxy_env("cgi_http_proxy");
if let Some(env) = env {
self.http_proxy = Some(ProxyItem::new(env, name)?);
}
}
let (env, name) = Self::get_proxy_env("https_proxy");
if let Some(env) = env {
self.https_proxy = Some(ProxyItem::new(env, name)?);
}
let (env, _name) = Self::get_proxy_env("no_proxy");
if let Some(env) = env {
*self.no_proxy_handler.borrow_mut() = Some(NoProxyPattern::new(&env));
}
Ok(())
}
fn get_proxy_env(env_name: &str) -> (Option<String>, String) {
for name in [env_name.to_lowercase(), env_name.to_uppercase()] {
if let Ok(val) = std::env::var(&name)
&& !val.is_empty()
{
return (Some(val), name);
}
}
(None, String::new())
}
fn no_proxy(&self, request_url: &str) -> bool {
match self.no_proxy_handler.borrow_mut().as_mut() {
None => false,
Some(handler) => handler.test(request_url).unwrap_or(false),
}
}
}
|
