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#[cfg(any(feature = "apigw_rest", feature = "apigw_http", feature = "apigw_websockets"))]
use crate::ext::extensions::{PathParameters, StageVariables};
use crate::ext::extensions::{QueryStringParameters, RawHttpPath};
#[cfg(feature = "alb")]
use aws_lambda_events::alb::{AlbTargetGroupRequest, AlbTargetGroupRequestContext};
#[cfg(feature = "apigw_rest")]
use aws_lambda_events::apigw::{ApiGatewayProxyRequest, ApiGatewayProxyRequestContext};
#[cfg(feature = "apigw_http")]
use aws_lambda_events::apigw::{ApiGatewayV2httpRequest, ApiGatewayV2httpRequestContext};
#[cfg(feature = "apigw_websockets")]
use aws_lambda_events::apigw::{ApiGatewayWebsocketProxyRequest, ApiGatewayWebsocketProxyRequestContext};
use aws_lambda_events::{encodings::Body, query_map::QueryMap};
use http::header::HeaderName;
use http::{HeaderMap, HeaderValue};
use serde::{Deserialize, Serialize};
use serde_json::error::Error as JsonError;
use std::future::Future;
use std::pin::Pin;
use std::{env, io::Read, mem};
use url::Url;
#[doc(hidden)]
#[derive(Deserialize, Debug)]
#[serde(untagged)]
pub enum LambdaRequest {
#[cfg(feature = "apigw_rest")]
ApiGatewayV1(ApiGatewayProxyRequest),
#[cfg(feature = "apigw_http")]
ApiGatewayV2(ApiGatewayV2httpRequest),
#[cfg(feature = "alb")]
Alb(AlbTargetGroupRequest),
#[cfg(feature = "apigw_websockets")]
WebSocket(ApiGatewayWebsocketProxyRequest),
}
impl LambdaRequest {
pub fn request_origin(&self) -> RequestOrigin {
match self {
#[cfg(feature = "apigw_rest")]
LambdaRequest::ApiGatewayV1 { .. } => RequestOrigin::ApiGatewayV1,
#[cfg(feature = "apigw_http")]
LambdaRequest::ApiGatewayV2 { .. } => RequestOrigin::ApiGatewayV2,
#[cfg(feature = "alb")]
LambdaRequest::Alb { .. } => RequestOrigin::Alb,
#[cfg(feature = "apigw_websockets")]
LambdaRequest::WebSocket { .. } => RequestOrigin::WebSocket,
}
}
}
pub type RequestFuture<'a, R, E> = Pin<Box<dyn Future<Output = Result<R, E>> + Send + 'a>>;
#[doc(hidden)]
#[derive(Debug, Clone)]
pub enum RequestOrigin {
#[cfg(feature = "apigw_rest")]
ApiGatewayV1,
#[cfg(feature = "apigw_http")]
ApiGatewayV2,
#[cfg(feature = "alb")]
Alb,
#[cfg(feature = "apigw_websockets")]
WebSocket,
}
#[cfg(feature = "apigw_http")]
fn into_api_gateway_v2_request(ag: ApiGatewayV2httpRequest) -> http::Request<Body> {
let http_method = ag.request_context.http.method.clone();
let host = ag
.headers
.get(http::header::HOST)
.and_then(|s| s.to_str().ok())
.or(ag.request_context.domain_name.as_deref());
let raw_path = ag.raw_path.unwrap_or_default();
let path = apigw_path_with_stage(&ag.request_context.stage, &raw_path);
let query_string_parameters = if let Some(query) = &ag.raw_query_string {
query.parse().unwrap() } else {
ag.query_string_parameters
};
let mut uri = build_request_uri(&path, &ag.headers, host, None);
if let Some(query) = ag.raw_query_string {
uri.push('?');
uri.push_str(&query);
}
let builder = http::Request::builder()
.uri(uri)
.extension(RawHttpPath(raw_path))
.extension(QueryStringParameters(query_string_parameters))
.extension(PathParameters(QueryMap::from(ag.path_parameters)))
.extension(StageVariables(QueryMap::from(ag.stage_variables)))
.extension(RequestContext::ApiGatewayV2(ag.request_context));
let mut headers = ag.headers;
update_xray_trace_id_header(&mut headers);
if let Some(cookies) = ag.cookies {
if let Ok(header_value) = HeaderValue::from_str(&cookies.join(";")) {
headers.insert(http::header::COOKIE, header_value);
}
}
let base64 = ag.is_base64_encoded;
let mut req = builder
.body(
ag.body
.as_deref()
.map_or_else(Body::default, |b| Body::from_maybe_encoded(base64, b)),
)
.expect("failed to build request");
let _ = mem::replace(req.headers_mut(), headers);
let _ = mem::replace(req.method_mut(), http_method);
req
}
fn update_xray_trace_id_header(headers: &mut HeaderMap) {
if let Ok(xray_trace_id) = env::var("_X_AMZN_TRACE_ID") {
if let Ok(header_value) = HeaderValue::from_str(&xray_trace_id) {
headers.insert(HeaderName::from_static("x-amzn-trace-id"), header_value);
}
}
}
#[cfg(feature = "apigw_rest")]
fn into_proxy_request(ag: ApiGatewayProxyRequest) -> http::Request<Body> {
let http_method = ag.http_method;
let host = ag
.headers
.get(http::header::HOST)
.and_then(|s| s.to_str().ok())
.or(ag.request_context.domain_name.as_deref());
let raw_path = ag.path.unwrap_or_default();
let path = apigw_path_with_stage(&ag.request_context.stage, &raw_path);
let builder = http::Request::builder()
.uri(build_request_uri(
&path,
&ag.headers,
host,
Some((&ag.multi_value_query_string_parameters, &ag.query_string_parameters)),
))
.extension(RawHttpPath(raw_path))
.extension(QueryStringParameters(
if ag.multi_value_query_string_parameters.is_empty() {
ag.query_string_parameters
} else {
ag.multi_value_query_string_parameters
},
))
.extension(PathParameters(QueryMap::from(ag.path_parameters)))
.extension(StageVariables(QueryMap::from(ag.stage_variables)))
.extension(RequestContext::ApiGatewayV1(ag.request_context));
let mut headers = ag.multi_value_headers;
headers.extend(ag.headers);
update_xray_trace_id_header(&mut headers);
let base64 = ag.is_base64_encoded.unwrap_or_default();
let mut req = builder
.body(
ag.body
.as_deref()
.map_or_else(Body::default, |b| Body::from_maybe_encoded(base64, b)),
)
.expect("failed to build request");
let _ = mem::replace(req.headers_mut(), headers);
let _ = mem::replace(req.method_mut(), http_method);
req
}
#[cfg(feature = "alb")]
fn into_alb_request(alb: AlbTargetGroupRequest) -> http::Request<Body> {
let http_method = alb.http_method;
let host = alb.headers.get(http::header::HOST).and_then(|s| s.to_str().ok());
let raw_path = alb.path.unwrap_or_default();
let query_string_parameters = decode_query_map(alb.query_string_parameters);
let multi_value_query_string_parameters = decode_query_map(alb.multi_value_query_string_parameters);
let builder = http::Request::builder()
.uri(build_request_uri(
&raw_path,
&alb.headers,
host,
Some((&multi_value_query_string_parameters, &query_string_parameters)),
))
.extension(RawHttpPath(raw_path))
.extension(QueryStringParameters(
if multi_value_query_string_parameters.is_empty() {
query_string_parameters
} else {
multi_value_query_string_parameters
},
))
.extension(RequestContext::Alb(alb.request_context));
let mut headers = alb.multi_value_headers;
headers.extend(alb.headers);
update_xray_trace_id_header(&mut headers);
let base64 = alb.is_base64_encoded;
let mut req = builder
.body(
alb.body
.as_deref()
.map_or_else(Body::default, |b| Body::from_maybe_encoded(base64, b)),
)
.expect("failed to build request");
let _ = mem::replace(req.headers_mut(), headers);
let _ = mem::replace(req.method_mut(), http_method);
req
}
#[cfg(feature = "alb")]
fn decode_query_map(query_map: QueryMap) -> QueryMap {
use std::str::FromStr;
let query_string = query_map.to_query_string();
let decoded = percent_encoding::percent_decode(query_string.as_bytes()).decode_utf8_lossy();
QueryMap::from_str(&decoded).unwrap_or_default()
}
#[cfg(feature = "apigw_websockets")]
fn into_websocket_request(ag: ApiGatewayWebsocketProxyRequest) -> http::Request<Body> {
let http_method = ag.http_method;
let host = ag
.headers
.get(http::header::HOST)
.and_then(|s| s.to_str().ok())
.or(ag.request_context.domain_name.as_deref());
let path = apigw_path_with_stage(&ag.request_context.stage, &ag.path.unwrap_or_default());
let builder = http::Request::builder()
.uri(build_request_uri(
&path,
&ag.headers,
host,
Some((&ag.multi_value_query_string_parameters, &ag.query_string_parameters)),
))
.extension(QueryStringParameters(
if ag.multi_value_query_string_parameters.is_empty() {
ag.query_string_parameters
} else {
ag.multi_value_query_string_parameters
},
))
.extension(PathParameters(QueryMap::from(ag.path_parameters)))
.extension(StageVariables(QueryMap::from(ag.stage_variables)))
.extension(RequestContext::WebSocket(ag.request_context));
let mut headers = ag.multi_value_headers;
headers.extend(ag.headers);
update_xray_trace_id_header(&mut headers);
let base64 = ag.is_base64_encoded.unwrap_or_default();
let mut req = builder
.body(
ag.body
.as_deref()
.map_or_else(Body::default, |b| Body::from_maybe_encoded(base64, b)),
)
.expect("failed to build request");
let _ = mem::replace(req.headers_mut(), headers);
let _ = mem::replace(req.method_mut(), http_method.unwrap_or(http::Method::GET));
req
}
#[cfg(any(feature = "apigw_rest", feature = "apigw_http", feature = "apigw_websockets"))]
fn apigw_path_with_stage(stage: &Option<String>, path: &str) -> String {
match stage {
None => path.into(),
Some(stage) if stage == "$default" => path.into(),
Some(stage) => format!("/{stage}{path}"),
}
}
#[derive(Deserialize, Debug, Clone, Serialize)]
#[serde(untagged)]
pub enum RequestContext {
#[cfg(feature = "apigw_rest")]
ApiGatewayV1(ApiGatewayProxyRequestContext),
#[cfg(feature = "apigw_http")]
ApiGatewayV2(ApiGatewayV2httpRequestContext),
#[cfg(feature = "alb")]
Alb(AlbTargetGroupRequestContext),
#[cfg(feature = "apigw_websockets")]
WebSocket(ApiGatewayWebsocketProxyRequestContext),
}
impl From<LambdaRequest> for http::Request<Body> {
fn from(value: LambdaRequest) -> Self {
match value {
#[cfg(feature = "apigw_rest")]
LambdaRequest::ApiGatewayV1(ag) => into_proxy_request(ag),
#[cfg(feature = "apigw_http")]
LambdaRequest::ApiGatewayV2(ag) => into_api_gateway_v2_request(ag),
#[cfg(feature = "alb")]
LambdaRequest::Alb(alb) => into_alb_request(alb),
#[cfg(feature = "apigw_websockets")]
LambdaRequest::WebSocket(ag) => into_websocket_request(ag),
}
}
}
pub fn from_reader<R>(rdr: R) -> Result<crate::Request, JsonError>
where
R: Read,
{
serde_json::from_reader(rdr).map(LambdaRequest::into)
}
pub fn from_str(s: &str) -> Result<crate::Request, JsonError> {
serde_json::from_str(s).map(LambdaRequest::into)
}
fn x_forwarded_proto() -> HeaderName {
HeaderName::from_static("x-forwarded-proto")
}
fn build_request_uri(
path: &str,
headers: &HeaderMap,
host: Option<&str>,
queries: Option<(&QueryMap, &QueryMap)>,
) -> String {
let mut url = match host {
None => {
let rel_url = Url::parse(&format!("http://localhost{path}")).unwrap();
rel_url.path().to_string()
}
Some(host) => {
let scheme = headers
.get(x_forwarded_proto())
.and_then(|s| s.to_str().ok())
.unwrap_or("https");
let url = format!("{scheme}://{host}{path}");
Url::parse(&url).unwrap().to_string()
}
};
if let Some((mv, sv)) = queries {
if !mv.is_empty() {
url.push('?');
url.push_str(&mv.to_query_string());
} else if !sv.is_empty() {
url.push('?');
url.push_str(&sv.to_query_string());
}
}
url
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ext::RequestExt;
use std::fs::File;
#[test]
fn deserializes_apigw_request_events_from_readables() {
let result = from_reader(File::open("tests/data/apigw_proxy_request.json").expect("expected file"));
assert!(result.is_ok(), "event was not parsed as expected {result:?}");
}
#[test]
fn deserializes_minimal_apigw_http_request_events() {
let input = include_str!("../tests/data/apigw_v2_proxy_request_minimal.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(req.uri(), "https://xxx.execute-api.us-east-1.amazonaws.com/");
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::ApiGatewayV2(_)),
"expected ApiGatewayV2 context, got {req_context:?}"
);
}
#[test]
fn deserializes_apigw_http_request_events() {
let input = include_str!("../tests/data/apigw_v2_proxy_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
let cookie_header = req
.headers()
.get(http::header::COOKIE)
.ok_or_else(|| "Cookie header not found".to_string())
.and_then(|v| v.to_str().map_err(|e| e.to_string()));
assert_eq!(req.method(), "POST");
assert_eq!(req.uri(), "https://id.execute-api.us-east-1.amazonaws.com/my/path?parameter1=value1¶meter1=value2¶meter2=value");
assert_eq!(cookie_header, Ok("cookie1=value1;cookie2=value2"));
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::ApiGatewayV2(_)),
"expected ApiGatewayV2 context, got {req_context:?}"
);
}
#[test]
fn deserializes_apigw_request_events() {
let input = include_str!("../tests/data/apigw_proxy_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(
req.uri(),
"https://wt6mne2s9k.execute-api.us-west-2.amazonaws.com/test/test/hello?name=me"
);
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::ApiGatewayV1(_)),
"expected ApiGateway context, got {req_context:?}"
);
}
#[test]
fn deserializes_lambda_function_url_request_events() {
let input = include_str!("../tests/data/lambda_function_url_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
let cookie_header = req
.headers()
.get_all(http::header::COOKIE)
.iter()
.map(|v| v.to_str().unwrap().to_string())
.reduce(|acc, nxt| [acc, nxt].join(";"));
assert_eq!(req.method(), "GET");
assert_eq!(
req.uri(),
"https://id.lambda-url.eu-west-2.on.aws/my/path?parameter1=value1¶meter1=value2¶meter2=value"
);
assert_eq!(cookie_header, Some("test=hi".to_string()));
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::ApiGatewayV2(_)),
"expected ApiGatewayV2 context, got {req_context:?}"
);
}
#[test]
fn deserializes_alb_request_events() {
let input = include_str!("../tests/data/alb_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(
req.uri(),
"https://lambda-846800462-us-east-2.elb.amazonaws.com/?myKey=val2"
);
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::Alb(_)),
"expected Alb context, got {req_context:?}"
);
}
#[test]
fn deserializes_alb_request_encoded_query_parameters_events() {
let input = include_str!("../tests/data/alb_request_encoded_query_parameters.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(
req.uri(),
"https://lambda-846800462-us-east-2.elb.amazonaws.com/?myKey=%3FshowAll%3Dtrue"
);
let req_context = req.request_context_ref().expect("Request is missing RequestContext");
assert!(
matches!(req_context, &RequestContext::Alb(_)),
"expected Alb context, got {req_context:?}"
);
}
#[test]
fn deserializes_apigw_multi_value_request_events() {
let input = include_str!("../tests/data/apigw_multi_value_proxy_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event is was not parsed as expected {result:?} given {input}"
);
let request = result.expect("failed to parse request");
assert!(!request
.query_string_parameters_ref()
.expect("Request is missing query parameters")
.is_empty());
assert_eq!(
request
.query_string_parameters_ref()
.and_then(|params| params.all("multivalueName")),
Some(vec!["you", "me"])
);
}
#[test]
fn deserializes_alb_multi_value_request_events() {
let input = include_str!("../tests/data/alb_multi_value_request.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event is was not parsed as expected {result:?} given {input}"
);
let request = result.expect("failed to parse request");
assert!(!request
.query_string_parameters_ref()
.expect("Request is missing query parameters")
.is_empty());
assert_eq!(
request
.query_string_parameters_ref()
.and_then(|params| params.all("myKey")),
Some(vec!["val1", "val2"])
);
}
#[test]
fn deserializes_alb_multi_value_request_encoded_query_parameters_events() {
let input = include_str!("../tests/data/alb_multi_value_request_encoded_query_parameters.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event is was not parsed as expected {result:?} given {input}"
);
let request = result.expect("failed to parse request");
assert!(!request
.query_string_parameters_ref()
.expect("Request is missing query parameters")
.is_empty());
assert_eq!(
request
.query_string_parameters_ref()
.and_then(|params| params.all("myKey")),
Some(vec!["?showAll=true", "?showAll=false"])
);
}
#[test]
fn deserialize_apigw_http_sam_local() {
let input = include_str!("../tests/data/apigw_v2_sam_local.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(req.uri(), "http://127.0.0.1:3000/hello");
}
#[test]
fn deserialize_apigw_no_host() {
let input = include_str!("../tests/data/apigw_no_host.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(req.uri(), "/test/test/hello?name=me");
}
#[test]
fn deserialize_alb_no_host() {
let input = include_str!("../tests/data/alb_no_host.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.method(), "GET");
assert_eq!(req.uri(), "/v1/health/");
}
#[test]
fn deserialize_apigw_path_with_space() {
let input = include_str!("../tests/data/apigw_request_path_with_space.json");
let result = from_str(input);
assert!(
result.is_ok(),
"event was not parsed as expected {result:?} given {input}"
);
let req = result.expect("failed to parse request");
assert_eq!(req.uri(), "https://id.execute-api.us-east-1.amazonaws.com/my/path-with%20space?parameter1=value1¶meter1=value2¶meter2=value");
}
#[test]
fn parse_paths_with_spaces() {
let url = build_request_uri("/path with spaces/and multiple segments", &HeaderMap::new(), None, None);
assert_eq!("/path%20with%20spaces/and%20multiple%20segments", url);
}
}