1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
use hyper::{Body, Method, Request, 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 {
Malformed(String),
ParseError(String),
NotAllowed(String),
NotSupported(String),
NotFound(String),
}
impl ProxyError {
pub fn to_json(&self) -> serde_json::Value {
json!({
"error": {
"reason": format!("{:?}", self),
"type": "unknown",
},
"status": 500,
})
}
}
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, [""]) => Body::empty(),
(&Method::POST, ["_search", "scroll"]) | (&Method::DELETE, ["_search", "scroll"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::Malformed(e.to_string()))?;
filter_scroll_request(¶ms, &whole_body, config)?
}
(&Method::GET, [index, "_search"]) | (&Method::POST, [index, "_search"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::Malformed(e.to_string()))?;
filter_search_request(index, ¶ms, &whole_body, config)?
}
(&Method::GET, [index, "_count"]) | (&Method::POST, [index, "_count"]) => {
let whole_body = hyper::body::to_bytes(body)
.await
.map_err(|e| ProxyError::Malformed(e.to_string()))?;
filter_search_request(index, ¶ms, &whole_body, config)?
}
(&Method::GET, [index, "_doc", key]) | (&Method::GET, [index, "_source", key]) => {
filter_read_request(index, path_chunks[1], key, ¶ms, config)?
}
_ => Err(ProxyError::NotSupported("unknown 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,
_key: &str,
_params: &UrlQueryParams,
config: &ProxyConfig,
) -> Result<Body, ProxyError> {
if !config.allow_index(index) {
return Err(ProxyError::NotAllowed(format!(
"index doesn't exist or isn't proxied: {}",
index
)));
}
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::NotAllowed(format!(
"index doesn't exist or isn't proxied: {}",
index
)));
}
// 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())
}
}
|
