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|
use hyper::{Body, Method, Request, StatusCode, Uri};
use serde::Deserialize;
use serde_json::json;
pub mod parse;
use parse::UrlQueryParams;
#[derive(Default, Deserialize, Debug, Clone)]
pub struct ProxyConfig {
pub bind_addr: Option<String>, // 127.0.0.1:9292
pub upstream_addr: Option<String>, // 127.0.0.1:9200
pub unsafe_all_indices: Option<bool>,
pub enable_cors: Option<bool>,
pub index: Vec<IndexConfig>,
}
#[derive(Deserialize, Debug, Clone)]
pub struct IndexConfig {
pub name: String,
}
impl ProxyConfig {
pub fn allow_index(&self, name: &str) -> bool {
if self.unsafe_all_indices == Some(true) {
return true;
}
for index in &self.index {
if index.name == name {
return true;
}
}
false
}
}
#[derive(Debug)]
pub enum ProxyError {
HttpError(String),
UpstreamError(String),
ParseError(String),
UnknownIndex(String),
NotSupported(String),
}
impl ProxyError {
pub fn http_status_code(&self) -> StatusCode {
match self {
ProxyError::HttpError(_) => StatusCode::BAD_REQUEST,
ProxyError::UpstreamError(_) => StatusCode::BAD_GATEWAY,
ProxyError::ParseError(_) => StatusCode::BAD_REQUEST,
ProxyError::UnknownIndex(_) => StatusCode::NOT_FOUND,
ProxyError::NotSupported(_) => StatusCode::FORBIDDEN,
}
}
pub fn to_json_value(&self) -> serde_json::Value {
let (type_slug, reason) = match self {
ProxyError::HttpError(s) => ("http-error", s.clone()),
ProxyError::UpstreamError(s) => ("upstream-error", s.clone()),
ProxyError::ParseError(s) => ("parse-error", s.clone()),
ProxyError::UnknownIndex(index) => (
"unknown-index",
format!(
"index does not exists, or public access not allowed: {}",
index
),
),
ProxyError::NotSupported(s) => ("not-supported", s.clone()),
};
json!({
"error": {
"reason": reason,
"type": type_slug,
},
"status": self.http_status_code().as_u16(),
})
}
}
pub async fn filter_request(
req: Request<Body>,
config: &ProxyConfig,
) -> Result<Request<Body>, ProxyError> {
let (parts, body) = req.into_parts();
// split path into at most 3 chunks
let mut req_path = parts.uri.path();
if req_path.starts_with("/") {
req_path = &req_path[1..];
}
let path_chunks: Vec<&str> = req_path.split("/").collect();
if path_chunks.len() > 3 {
return Err(ProxyError::NotSupported(
"only request paths with up to three segments allowed".to_string(),
));
}
let params: UrlQueryParams = serde_urlencoded::from_str(parts.uri.query().unwrap_or(""))
.map_err(|e| ProxyError::ParseError(e.to_string()))?;
// this is sort of like a router
let body = match (&parts.method, path_chunks.as_slice()) {
(&Method::GET, [""]) | (&Method::HEAD, [""]) | (&Method::OPTIONS, [""]) => Body::empty(),
(&Method::HEAD, ["_search", "scroll"]) | (&Method::OPTIONS, ["_search", "scroll"]) => {
Body::empty()
}
(&Method::GET, ["_search", "scroll"])
| (&Method::POST, ["_search", "scroll"])
| (&Method::DELETE, ["_search", "scroll"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::HttpError(e.to_string()))?;
filter_scroll_request(¶ms, &whole_body, config)?
}
(&Method::HEAD, [index, "_search"]) | (&Method::OPTIONS, [index, "_search"]) => {
filter_search_request(index, ¶ms, &[], config)?
}
(&Method::GET, [index, "_search"]) | (&Method::POST, [index, "_search"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::HttpError(e.to_string()))?;
filter_search_request(index, ¶ms, &whole_body, config)?
}
(&Method::HEAD, [index, "_count"]) | (&Method::OPTIONS, [index, "_count"]) => {
filter_search_request(index, ¶ms, &[], config)?
}
(&Method::GET, [index, "_count"]) | (&Method::POST, [index, "_count"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::HttpError(e.to_string()))?;
filter_search_request(index, ¶ms, &whole_body, config)?
}
(&Method::GET, [index, "_doc", _key])
| (&Method::GET, [index, "_source", _key])
| (&Method::HEAD, [index, "_doc", _key])
| (&Method::OPTIONS, [index, "_source", _key]) => {
filter_read_request(index, path_chunks[1], ¶ms, config)?
}
(&Method::GET, [index, ""])
| (&Method::HEAD, [index, ""])
| (&Method::OPTIONS, [index, ""]) => {
filter_read_request(index, path_chunks[1], ¶ms, config)?
}
(&Method::GET, [index])
| (&Method::HEAD, [index])
| (&Method::OPTIONS, [index]) => {
// only allow operations on index name (no trailing slash) if not "unsafe_all_indices"
// (aka, only if indexes are explicitly enumerated)
// otherwise all top-level API endpoints would be allowed
if config.unsafe_all_indices != Some(true) {
filter_read_request(index, "", ¶ms, config)?
} else {
Err(ProxyError::NotSupported("unknown elasticsearch API endpoint".to_string()))?
}
}
(&Method::GET, [index, "_mapping"])
| (&Method::HEAD, [index, "_mapping"])
| (&Method::OPTIONS, [index, "_mapping"]) => {
filter_read_request(index, path_chunks[1], ¶ms, config)?
}
_ => Err(ProxyError::NotSupported(
"unknown elasticsearch API endpoint".to_string(),
))?,
};
let upstream_query = serde_urlencoded::to_string(params).expect("re-encoding URL parameters");
let upstream_query_and_params = if upstream_query.len() > 0 {
format!("{}?{}", req_path, upstream_query)
} else {
req_path.to_string()
};
let upstream_uri = Uri::builder()
.scheme("http")
.authority(
config
.upstream_addr
.as_ref()
.unwrap_or(&"localhost:9200".to_string())
.as_str(),
)
.path_and_query(upstream_query_and_params.as_str())
.build()
.expect("constructing upstream request URI");
let upstream_req = Request::builder()
.uri(upstream_uri)
.method(&parts.method)
.header("Content-Type", "application/json; charset=UTF-8")
.body(body)
.expect("constructing upstream request");
Ok(upstream_req)
}
pub fn filter_scroll_request(
_params: &UrlQueryParams,
body: &[u8],
_config: &ProxyConfig,
) -> Result<Body, ProxyError> {
if body.len() > 0 {
let parsed: parse::ScrollBody =
serde_json::from_slice(body).map_err(|e| ProxyError::ParseError(e.to_string()))?;
// check that scroll_id is not "_all" or too short
match &parsed.scroll_id {
parse::StringOrArray::String(single) => {
if single == "_all" || single.len() < 8 {
return Err(ProxyError::NotSupported(format!(
"short scroll_id: {}",
single
)));
}
}
parse::StringOrArray::Array(array) => {
for single in array {
if single == "_all" || single.len() < 8 {
return Err(ProxyError::NotSupported(format!(
"short scroll_id: {}",
single
)));
}
}
}
}
Ok(Body::from(serde_json::to_string(&parsed).unwrap()))
} else {
Ok(Body::empty())
}
}
pub fn filter_read_request(
index: &str,
_endpoint: &str,
_params: &UrlQueryParams,
config: &ProxyConfig,
) -> Result<Body, ProxyError> {
if !config.allow_index(index) {
return Err(ProxyError::UnknownIndex(index.to_string()));
}
Ok(Body::empty())
}
pub fn filter_search_request(
index: &str,
_params: &UrlQueryParams,
body: &[u8],
config: &ProxyConfig,
) -> Result<Body, ProxyError> {
if !config.allow_index(index) {
return Err(ProxyError::UnknownIndex(index.to_string()));
}
// XXX: more checks
if body.len() > 0 {
let parsed: parse::SearchBody =
serde_json::from_slice(body).map_err(|e| ProxyError::ParseError(e.to_string()))?;
Ok(Body::from(serde_json::to_string(&parsed).unwrap()))
} else {
Ok(Body::empty())
}
}
|
