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use crate::request::RequestOrigin;
#[cfg(feature = "alb")]
use aws_lambda_events::alb::AlbTargetGroupResponse;
#[cfg(any(feature = "apigw_rest", feature = "apigw_websockets"))]
use aws_lambda_events::apigw::ApiGatewayProxyResponse;
#[cfg(feature = "apigw_http")]
use aws_lambda_events::apigw::ApiGatewayV2httpResponse;
use aws_lambda_events::encodings::Body;
use encoding_rs::Encoding;
use http::header::CONTENT_ENCODING;
use http::HeaderMap;
use http::{header::CONTENT_TYPE, Response, StatusCode};
use http_body::Body as HttpBody;
use hyper::body::to_bytes;
use mime::{Mime, CHARSET};
use serde::Serialize;
use std::borrow::Cow;
use std::future::ready;
use std::{fmt, future::Future, pin::Pin};
const X_LAMBDA_HTTP_CONTENT_ENCODING: &str = "x-lambda-http-content-encoding";
const TEXT_ENCODING_PREFIXES: [&str; 5] = [
"text",
"application/json",
"application/javascript",
"application/xml",
"application/yaml",
];
const TEXT_ENCODING_SUFFIXES: [&str; 3] = ["+xml", "+yaml", "+json"];
#[doc(hidden)]
#[derive(Serialize, Debug)]
#[serde(untagged)]
pub enum LambdaResponse {
#[cfg(any(feature = "apigw_rest", feature = "apigw_websockets"))]
ApiGatewayV1(ApiGatewayProxyResponse),
#[cfg(feature = "apigw_http")]
ApiGatewayV2(ApiGatewayV2httpResponse),
#[cfg(feature = "alb")]
Alb(AlbTargetGroupResponse),
}
impl LambdaResponse {
pub(crate) fn from_response(request_origin: &RequestOrigin, value: Response<Body>) -> Self {
let (parts, bod) = value.into_parts();
let (is_base64_encoded, body) = match bod {
Body::Empty => (false, None),
b @ Body::Text(_) => (false, Some(b)),
b @ Body::Binary(_) => (true, Some(b)),
};
let headers = parts.headers;
let status_code = parts.status.as_u16();
match request_origin {
#[cfg(feature = "apigw_rest")]
RequestOrigin::ApiGatewayV1 => LambdaResponse::ApiGatewayV1(ApiGatewayProxyResponse {
body,
status_code: status_code as i64,
is_base64_encoded: Some(is_base64_encoded),
headers: headers.clone(),
multi_value_headers: headers,
}),
#[cfg(feature = "apigw_http")]
RequestOrigin::ApiGatewayV2 => {
use http::header::SET_COOKIE;
let mut headers = headers;
let cookies = headers
.get_all(SET_COOKIE)
.iter()
.cloned()
.map(|v| v.to_str().ok().unwrap_or_default().to_string())
.collect();
headers.remove(SET_COOKIE);
LambdaResponse::ApiGatewayV2(ApiGatewayV2httpResponse {
body,
status_code: status_code as i64,
is_base64_encoded: Some(is_base64_encoded),
cookies,
headers: headers.clone(),
multi_value_headers: headers,
})
}
#[cfg(feature = "alb")]
RequestOrigin::Alb => LambdaResponse::Alb(AlbTargetGroupResponse {
body,
status_code: status_code as i64,
is_base64_encoded,
headers: headers.clone(),
multi_value_headers: headers,
status_description: Some(format!(
"{} {}",
status_code,
parts.status.canonical_reason().unwrap_or_default()
)),
}),
#[cfg(feature = "apigw_websockets")]
RequestOrigin::WebSocket => LambdaResponse::ApiGatewayV1(ApiGatewayProxyResponse {
body,
status_code: status_code as i64,
is_base64_encoded: Some(is_base64_encoded),
headers: headers.clone(),
multi_value_headers: headers,
}),
}
}
}
pub trait IntoResponse {
fn into_response(self) -> ResponseFuture;
}
impl<B> IntoResponse for Response<B>
where
B: ConvertBody + Send + 'static,
{
fn into_response(self) -> ResponseFuture {
let (parts, body) = self.into_parts();
let headers = parts.headers.clone();
let fut = async { Response::from_parts(parts, body.convert(headers).await) };
Box::pin(fut)
}
}
impl IntoResponse for String {
fn into_response(self) -> ResponseFuture {
Box::pin(ready(Response::new(Body::from(self))))
}
}
impl IntoResponse for &str {
fn into_response(self) -> ResponseFuture {
Box::pin(ready(Response::new(Body::from(self))))
}
}
impl IntoResponse for &[u8] {
fn into_response(self) -> ResponseFuture {
Box::pin(ready(Response::new(Body::from(self))))
}
}
impl IntoResponse for Vec<u8> {
fn into_response(self) -> ResponseFuture {
Box::pin(ready(Response::new(Body::from(self))))
}
}
impl IntoResponse for serde_json::Value {
fn into_response(self) -> ResponseFuture {
Box::pin(async move {
Response::builder()
.header(CONTENT_TYPE, "application/json")
.body(
serde_json::to_string(&self)
.expect("unable to serialize serde_json::Value")
.into(),
)
.expect("unable to build http::Response")
})
}
}
impl IntoResponse for (StatusCode, String) {
fn into_response(self) -> ResponseFuture {
let (status, body) = self;
Box::pin(ready(
Response::builder()
.status(status)
.body(Body::from(body))
.expect("unable to build http::Response"),
))
}
}
impl IntoResponse for (StatusCode, &str) {
fn into_response(self) -> ResponseFuture {
let (status, body) = self;
Box::pin(ready(
Response::builder()
.status(status)
.body(Body::from(body))
.expect("unable to build http::Response"),
))
}
}
impl IntoResponse for (StatusCode, &[u8]) {
fn into_response(self) -> ResponseFuture {
let (status, body) = self;
Box::pin(ready(
Response::builder()
.status(status)
.body(Body::from(body))
.expect("unable to build http::Response"),
))
}
}
impl IntoResponse for (StatusCode, Vec<u8>) {
fn into_response(self) -> ResponseFuture {
let (status, body) = self;
Box::pin(ready(
Response::builder()
.status(status)
.body(Body::from(body))
.expect("unable to build http::Response"),
))
}
}
impl IntoResponse for (StatusCode, serde_json::Value) {
fn into_response(self) -> ResponseFuture {
let (status, body) = self;
Box::pin(async move {
Response::builder()
.status(status)
.header(CONTENT_TYPE, "application/json")
.body(
serde_json::to_string(&body)
.expect("unable to serialize serde_json::Value")
.into(),
)
.expect("unable to build http::Response")
})
}
}
pub type ResponseFuture = Pin<Box<dyn Future<Output = Response<Body>> + Send>>;
pub trait ConvertBody {
fn convert(self, parts: HeaderMap) -> BodyFuture;
}
impl<B> ConvertBody for B
where
B: HttpBody + Unpin + Send + 'static,
B::Data: Send,
B::Error: fmt::Debug,
{
fn convert(self, headers: HeaderMap) -> BodyFuture {
if headers.get(CONTENT_ENCODING).is_some() {
return convert_to_binary(self);
}
let content_type = if let Some(value) = headers.get(CONTENT_TYPE) {
value.to_str().unwrap_or_default()
} else {
return convert_to_text(self, "utf-8");
};
for prefix in TEXT_ENCODING_PREFIXES {
if content_type.starts_with(prefix) {
return convert_to_text(self, content_type);
}
}
for suffix in TEXT_ENCODING_SUFFIXES {
if content_type.ends_with(suffix) {
return convert_to_text(self, content_type);
}
}
if let Some(value) = headers.get(X_LAMBDA_HTTP_CONTENT_ENCODING) {
if value == "text" {
return convert_to_text(self, content_type);
}
}
convert_to_binary(self)
}
}
fn convert_to_binary<B>(body: B) -> BodyFuture
where
B: HttpBody + Unpin + Send + 'static,
B::Data: Send,
B::Error: fmt::Debug,
{
Box::pin(async move { Body::from(to_bytes(body).await.expect("unable to read bytes from body").to_vec()) })
}
fn convert_to_text<B>(body: B, content_type: &str) -> BodyFuture
where
B: HttpBody + Unpin + Send + 'static,
B::Data: Send,
B::Error: fmt::Debug,
{
let mime_type = content_type.parse::<Mime>();
let encoding = match mime_type.as_ref() {
Ok(mime) => mime.get_param(CHARSET).unwrap_or(mime::UTF_8),
Err(_) => mime::UTF_8,
};
let label = encoding.as_ref().as_bytes();
let encoding = Encoding::for_label(label).unwrap_or(encoding_rs::UTF_8);
Box::pin(async move {
let bytes = to_bytes(body).await.expect("unable to read bytes from body");
let (content, _, _) = encoding.decode(&bytes);
match content {
Cow::Borrowed(content) => Body::from(content),
Cow::Owned(content) => Body::from(content),
}
})
}
pub type BodyFuture = Pin<Box<dyn Future<Output = Body> + Send>>;
#[cfg(test)]
mod tests {
use super::{Body, IntoResponse, LambdaResponse, RequestOrigin, X_LAMBDA_HTTP_CONTENT_ENCODING};
use http::{
header::{CONTENT_ENCODING, CONTENT_TYPE},
Response, StatusCode,
};
use hyper::Body as HyperBody;
use serde_json::{self, json};
const SVG_LOGO: &str = include_str!("../tests/data/svg_logo.svg");
#[tokio::test]
async fn json_into_response() {
let response = json!({ "hello": "lambda"}).into_response().await;
match response.body() {
Body::Text(json) => assert_eq!(json, r#"{"hello":"lambda"}"#),
_ => panic!("invalid body"),
}
assert_eq!(
response
.headers()
.get(CONTENT_TYPE)
.map(|h| h.to_str().expect("invalid header")),
Some("application/json")
)
}
#[tokio::test]
async fn text_into_response() {
let response = "text".into_response().await;
match response.body() {
Body::Text(text) => assert_eq!(text, "text"),
_ => panic!("invalid body"),
}
}
#[tokio::test]
async fn bytes_into_response() {
let response = "text".as_bytes().into_response().await;
match response.body() {
Body::Binary(data) => assert_eq!(data, "text".as_bytes()),
_ => panic!("invalid body"),
}
}
#[tokio::test]
async fn json_with_status_code_into_response() {
let response = (StatusCode::CREATED, json!({ "hello": "lambda"})).into_response().await;
match response.body() {
Body::Text(json) => assert_eq!(json, r#"{"hello":"lambda"}"#),
_ => panic!("invalid body"),
}
match response.status() {
StatusCode::CREATED => (),
_ => panic!("invalid status code"),
}
assert_eq!(
response
.headers()
.get(CONTENT_TYPE)
.map(|h| h.to_str().expect("invalid header")),
Some("application/json")
)
}
#[tokio::test]
async fn text_with_status_code_into_response() {
let response = (StatusCode::CREATED, "text").into_response().await;
match response.status() {
StatusCode::CREATED => (),
_ => panic!("invalid status code"),
}
match response.body() {
Body::Text(text) => assert_eq!(text, "text"),
_ => panic!("invalid body"),
}
}
#[tokio::test]
async fn bytes_with_status_code_into_response() {
let response = (StatusCode::CREATED, "text".as_bytes()).into_response().await;
match response.status() {
StatusCode::CREATED => (),
_ => panic!("invalid status code"),
}
match response.body() {
Body::Binary(data) => assert_eq!(data, "text".as_bytes()),
_ => panic!("invalid body"),
}
}
#[tokio::test]
async fn content_encoding_header() {
let response = Response::builder()
.header(CONTENT_ENCODING, "gzip")
.body(HyperBody::from("000000".as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
let response = LambdaResponse::from_response(&RequestOrigin::ApiGatewayV2, response);
let json = serde_json::to_string(&response).expect("failed to serialize to json");
assert_eq!(
json,
r#"{"statusCode":200,"headers":{"content-encoding":"gzip"},"multiValueHeaders":{"content-encoding":["gzip"]},"body":"MDAwMDAw","isBase64Encoded":true,"cookies":[]}"#
)
}
#[tokio::test]
async fn content_type_header() {
let response = Response::builder()
.header(CONTENT_TYPE, "application/json")
.body(HyperBody::from("000000".as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
let response = LambdaResponse::from_response(&RequestOrigin::ApiGatewayV2, response);
let json = serde_json::to_string(&response).expect("failed to serialize to json");
assert_eq!(
json,
r#"{"statusCode":200,"headers":{"content-type":"application/json"},"multiValueHeaders":{"content-type":["application/json"]},"body":"000000","isBase64Encoded":false,"cookies":[]}"#
)
}
#[tokio::test]
async fn charset_content_type_header() {
let response = Response::builder()
.header(CONTENT_TYPE, "application/json; charset=utf-16")
.body(HyperBody::from("000000".as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
let response = LambdaResponse::from_response(&RequestOrigin::ApiGatewayV2, response);
let json = serde_json::to_string(&response).expect("failed to serialize to json");
assert_eq!(
json,
r#"{"statusCode":200,"headers":{"content-type":"application/json; charset=utf-16"},"multiValueHeaders":{"content-type":["application/json; charset=utf-16"]},"body":"〰〰〰","isBase64Encoded":false,"cookies":[]}"#
)
}
#[tokio::test]
async fn content_headers_unset() {
let response = Response::builder()
.body(HyperBody::from("000000".as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
let response = LambdaResponse::from_response(&RequestOrigin::ApiGatewayV2, response);
let json = serde_json::to_string(&response).expect("failed to serialize to json");
assert_eq!(
json,
r#"{"statusCode":200,"headers":{},"multiValueHeaders":{},"body":"000000","isBase64Encoded":false,"cookies":[]}"#
)
}
#[test]
fn serialize_multi_value_headers() {
let res = LambdaResponse::from_response(
&RequestOrigin::ApiGatewayV1,
Response::builder()
.header("multi", "a")
.header("multi", "b")
.body(Body::from(()))
.expect("failed to create response"),
);
let json = serde_json::to_string(&res).expect("failed to serialize to json");
assert_eq!(
json,
r#"{"statusCode":200,"headers":{"multi":"a"},"multiValueHeaders":{"multi":["a","b"]},"isBase64Encoded":false}"#
)
}
#[test]
fn serialize_cookies() {
let res = LambdaResponse::from_response(
&RequestOrigin::ApiGatewayV2,
Response::builder()
.header("set-cookie", "cookie1=a")
.header("set-cookie", "cookie2=b")
.body(Body::from(()))
.expect("failed to create response"),
);
let json = serde_json::to_string(&res).expect("failed to serialize to json");
assert_eq!(
"{\"statusCode\":200,\"headers\":{},\"multiValueHeaders\":{},\"isBase64Encoded\":false,\"cookies\":[\"cookie1=a\",\"cookie2=b\"]}",
json
)
}
#[tokio::test]
async fn content_type_xml_as_text() {
let response = Response::builder()
.header(CONTENT_TYPE, "image/svg+xml")
.body(HyperBody::from(SVG_LOGO.as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
match response.body() {
Body::Text(body) => assert_eq!(SVG_LOGO, body),
_ => panic!("invalid body"),
}
assert_eq!(
response
.headers()
.get(CONTENT_TYPE)
.map(|h| h.to_str().expect("invalid header")),
Some("image/svg+xml")
)
}
#[tokio::test]
async fn content_type_custom_encoding_as_text() {
let response = Response::builder()
.header(CONTENT_TYPE, "image/svg")
.header(X_LAMBDA_HTTP_CONTENT_ENCODING, "text")
.body(HyperBody::from(SVG_LOGO.as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
match response.body() {
Body::Text(body) => assert_eq!(SVG_LOGO, body),
_ => panic!("invalid body"),
}
assert_eq!(
response
.headers()
.get(CONTENT_TYPE)
.map(|h| h.to_str().expect("invalid header")),
Some("image/svg")
)
}
#[tokio::test]
async fn content_type_yaml_as_text() {
let yaml = r#"---
foo: bar
"#;
let formats = ["application/yaml", "custom/vdn+yaml"];
for format in formats {
let response = Response::builder()
.header(CONTENT_TYPE, format)
.body(HyperBody::from(yaml.as_bytes()))
.expect("unable to build http::Response");
let response = response.into_response().await;
match response.body() {
Body::Text(body) => assert_eq!(yaml, body),
_ => panic!("invalid body"),
}
assert_eq!(
response
.headers()
.get(CONTENT_TYPE)
.map(|h| h.to_str().expect("invalid header")),
Some(format)
)
}
}
}