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|
use std::{
fmt,
ops::Deref,
sync::atomic::{AtomicU8, AtomicUsize},
};
use axum::{
RequestPartsExt,
extract::{FromRequestParts, OptionalFromRequestParts},
http::{HeaderName, StatusCode, header, request::Parts},
};
use sha2::{Digest, Sha256};
static REQUEST_ID: AtomicU8 = AtomicU8::new(0);
#[derive(Debug, Clone)]
pub struct RequestContext {
id: u8,
hash: SessionHash,
referer: Option<Referer>,
}
impl RequestContext {
pub fn hash(&self) -> &SessionHash {
&self.hash
}
pub fn referer(&self) -> Option<&str> {
self.referer.as_deref()
}
pub fn identifying_string(&self) -> String {
format!("[{}|{:>3}]", self.hash, self.id)
}
}
impl<S> FromRequestParts<S> for RequestContext
where
S: Send + Sync,
{
type Rejection = (StatusCode, &'static str);
async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
let id = REQUEST_ID.fetch_add(1, std::sync::atomic::Ordering::Acquire);
let hash = parts.extract::<SessionHash>().await?;
let referer = parts.extract::<Option<Referer>>().await?;
Ok(Self { id, hash, referer })
}
}
impl fmt::Display for RequestContext {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let id = self.id;
match self.referer() {
None => write!(f, "[{}|{id:>3}]", self.hash),
Some(refer) => write!(f, "[{}|{id:>3}] (refer {refer})", self.hash),
}
}
}
#[derive(Debug, Clone)]
pub struct RemoteIp(String);
impl<S> FromRequestParts<S> for RemoteIp
where
S: Send + Sync,
{
type Rejection = (StatusCode, &'static str);
async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
if let Some(forwarded_for) = parts
.headers
.get(HeaderName::from_static("x-forwarded-for"))
{
match forwarded_for.to_str() {
Err(_e) => Err((StatusCode::INTERNAL_SERVER_ERROR, "server error")),
Ok(remoteip) => Ok(Self(remoteip.to_owned())),
}
} else {
Err((StatusCode::INTERNAL_SERVER_ERROR, "server error"))
}
}
}
impl Deref for RemoteIp {
type Target = str;
fn deref(&self) -> &Self::Target {
&self.0
}
}
#[derive(Debug, Copy, Clone)]
pub struct SessionHash([u8; 4]);
impl<S> FromRequestParts<S> for SessionHash
where
S: Send + Sync,
{
type Rejection = (StatusCode, &'static str);
async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
let remote = parts
.extract::<RemoteIp>()
.await
.map(|rip| rip.0)
.unwrap_or(String::from("127.0.0.1"));
let agent = parts
.headers
.get(header::USER_AGENT)
.and_then(|ua| ua.to_str().ok())
.unwrap_or("unknown");
let date = timeparse::whichever_now();
let date_str = timeparse::format::iso_date(&date.date());
let string = format!("{remote} - {agent} - {date_str}");
let mut hasher = Sha256::new();
hasher.update(string.as_bytes());
let hash = hasher.finalize();
let slc: [u8; 4] = hash.as_slice()[0..4].try_into().unwrap();
Ok(Self(slc))
}
}
impl fmt::Display for SessionHash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for byte in self.0.as_slice() {
write!(f, "{byte:02X}")?;
}
Ok(())
}
}
#[derive(Debug, Clone)]
pub struct Referer(String);
impl<S> OptionalFromRequestParts<S> for Referer
where
S: Send + Sync,
{
type Rejection = (StatusCode, &'static str);
async fn from_request_parts(
parts: &mut Parts,
_state: &S,
) -> Result<Option<Self>, Self::Rejection> {
if let Some(refer) = parts.headers.get(header::REFERER) {
match refer.to_str() {
Err(_e) => Err((StatusCode::INTERNAL_SERVER_ERROR, "server error")),
Ok(refer) => match url::Url::parse(refer) {
Err(_e) => Err((
StatusCode::INTERNAL_SERVER_ERROR,
"failed to parse referer url",
)),
Ok(url) => match url.host_str() {
None => Err((StatusCode::INTERNAL_SERVER_ERROR, "referer url had no host")),
Some(str) => Ok(Some(Referer(str.to_owned()))),
},
},
}
} else {
Ok(None)
}
}
}
impl Deref for Referer {
type Target = str;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl fmt::Display for Referer {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
|
