use super::*;
#[derive(Debug)]
pub struct WebRequest {
pub initial: Box<[u8]>,
pub initial_remaining: usize,
pub length_hint: usize,
pub body: hyper::body::Body,
pub boundary_finder: multipart::BoundaryFinder,
pub reply_to: oneshot::Sender<WebResponse>,
pub warnings: Warnings,
pub conn: Arc<String>,
pub may_route: MayRoute,
}
#[derive(Debug)]
pub struct WebResponse {
pub warnings: Warnings,
pub data: Result<WebResponseData, AE>,
}
pub type WebResponseData = FrameQueueBuf;
pub type WebResponseBody = BufBody<FrameQueueBuf>;
pub async fn handle(
conn: Arc<String>,
global: Arc<Global>,
req: hyper::Request<hyper::Body>
) -> Result<hyper::Response<WebResponseBody>, hyper::http::Error> {
if req.method() == Method::GET {
let mut resp = hyper::Response::new(BufBody::display("hippotat\r\n"));
resp.headers_mut().insert(
"Content-Type",
"text/plain; charset=US-ASCII".try_into().unwrap()
);
return Ok(resp)
}
let mut warnings: Warnings = default();
async {
let get_header = |hn: &str| {
let mut values = req.headers().get_all(hn).iter();
let v = values.next().ok_or_else(|| anyhow!("missing {}", hn))?;
if values.next().is_some() { throw!(anyhow!("multiple {}!", hn)); }
let v = v.to_str().context(anyhow!("interpret {} as UTF-8", hn))?;
Ok::<_,AE>(v)
};
let mkboundary = |b: &'_ _| format!("\n--{}", b).into_bytes();
let boundary = match (||{
let t = get_header("Content-Type")?;
let t: mime::Mime = t.parse().context("parse Content-Type")?;
if t.type_() != "multipart" { throw!(anyhow!("not multipart/")) }
let b = mime::BOUNDARY;
let b = t.get_param(b).ok_or_else(|| anyhow!("missing boundary=..."))?;
if t.subtype() != "form-data" {
warnings.add(&"Content-Type not /form-data")?;
}
let b = mkboundary(b.as_str());
Ok::<_,AE>(b)
})() {
Ok(y) => y,
Err(e) => {
warnings.add(&e.wrap_err("guessing boundary"))?;
mkboundary("b")
},
};
let length_hint: usize = (||{
let clength = get_header("Content-Length")?;
let clength = clength.parse().context("parse Content-Length")?;
Ok::<_,AE>(clength)
})().unwrap_or_else(
|e| { let _ = warnings.add(&e.wrap_err("parsing Content-Length")); 0 }
);
let mut body = req.into_body();
let initial = match read_limited_bytes(
METADATA_MAX_LEN, default(), length_hint, &mut body
).await {
Ok(all) => all,
Err(ReadLimitedError::Truncated { sofar,.. }) => sofar,
Err(ReadLimitedError::Hyper(e)) => throw!(e),
};
let boundary_finder = memmem::Finder::new(&boundary);
let mut boundary_iter = boundary_finder.find_iter(&initial);
let start = if initial.starts_with(&boundary[1..]) { boundary.len()-1 }
else if let Some(start) = boundary_iter.next() { start + boundary.len() }
else { throw!(anyhow!("initial boundary not found")) };
let comp = multipart::process_boundary
(&mut warnings, &initial[start..], PartName::m)?
.ok_or_else(|| anyhow!(r#"no "m" component"#))?;
if comp.name != PartName::m { throw!(anyhow!(
r#"first multipart component must be name="m""#
)) }
let mut meta = MetadataFieldIterator::new(comp.payload);
let client: ClientName = meta.need_parse().context("client addr")?;
let mut hmac_got = [0; HMAC_L];
let (client_time, hmac_got_l) = (||{
let token: &str = meta.need_next().context(r#"find in "m""#)?;
let (time_t, hmac_b64) = token.split_once(' ')
.ok_or_else(|| anyhow!("split"))?;
let time_t = u64::from_str_radix(time_t, 16).context("parse time_t")?;
let l = io::copy(
&mut base64::read::DecoderReader::new(&mut hmac_b64.as_bytes(),
BASE64_CONFIG),
&mut &mut hmac_got[..]
).context("parse b64 token")?;
let l = l.try_into()?;
Ok::<_,AE>((time_t, l))
})().context("token")?;
let hmac_got = &hmac_got[0..hmac_got_l];
let client_name = client;
let client = global.all_clients.get(&client_name);
let client_exists = subtle::Choice::from(client.is_some() as u8);
let secret = client.map(|c| c.ic.secret.0.as_bytes());
let secret = secret.unwrap_or(&[0x55; HMAC_B][..]);
let client_time_s = format!("{:x}", client_time);
let hmac_exp = token_hmac(secret, client_time_s.as_bytes());
let hmac_ok = hmac_got.ct_eq(&hmac_exp);
if ! bool::from(hmac_ok & client_exists) {
debug!("{} rejected client {}", &conn, &client_name);
let body = BufBody::display("Not authorised\r\n");
return Ok(
hyper::Response::builder()
.status(hyper::StatusCode::FORBIDDEN)
.header("Content-Type", r#"text/plain; charset="utf-8""#)
.body(body)
)
}
let client = client.unwrap();
let now = time_t_now();
let chk_skew = |a: u64, b: u64, c_ahead_behind| {
if let Some(a_ahead) = a.checked_sub(b) {
if a_ahead > client.ic.max_clock_skew.as_secs() {
throw!(anyhow!("too much clock skew (client {} by {})",
c_ahead_behind, a_ahead));
}
}
Ok::<_,AE>(())
};
chk_skew(client_time, now, "ahead")?;
chk_skew(now, client_time, "behind")?;
let initial_remaining = meta.remaining_bytes_len();
let (reply_to, reply_recv) = oneshot::channel();
trace!("{} {} request, Content-Length={}",
&conn, &client_name, length_hint);
let wreq = WebRequest {
initial,
initial_remaining,
length_hint,
boundary_finder: boundary_finder.into_owned(),
body,
warnings: mem::take(&mut warnings),
reply_to,
conn: conn.clone(),
may_route: MayRoute::came_from_outside_hippotatd(),
};
client.web.try_send(wreq)
.map_err(|_| anyhow!("client user task overloaded"))?;
let reply: WebResponse = reply_recv.await?;
warnings = reply.warnings;
let data = reply.data?;
if warnings.warnings.is_empty() {
trace!("{} {} responding, {}",
&conn, &client_name, data.len());
} else {
debug!("{} {} responding, {} warnings={:?}",
&conn, &client_name, data.len(),
&warnings.warnings);
}
let data = BufBody::new(data);
Ok::<_,AE>(
hyper::Response::builder()
.header("Content-Type", r#"application/octet-stream"#)
.body(data)
)
}.await.unwrap_or_else(|e| {
debug!("{} error {}", &conn, &e);
let mut errmsg = format!("ERROR\n\n{:?}\n\n", &e);
for w in warnings.warnings {
writeln!(errmsg, "warning: {}", w).unwrap();
}
hyper::Response::builder()
.status(hyper::StatusCode::BAD_REQUEST)
.header("Content-Type", r#"text/plain; charset="utf-8""#)
.body(BufBody::display(errmsg))
})
}