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use std::time::Duration;
use async_trait::async_trait;
use hyper::{Body, Request};
use crate::request::HttpClient;
use crate::{
non_empty_env_var, parse_credentials_from_aws_service, AwsCredentials, CredentialsError,
ProvideAwsCredentials,
};
const AWS_CREDENTIALS_PROVIDER_IP: &str = "169.254.170.2";
const AWS_CONTAINER_CREDENTIALS_RELATIVE_URI: &str = "AWS_CONTAINER_CREDENTIALS_RELATIVE_URI";
const AWS_CONTAINER_CREDENTIALS_FULL_URI: &str = "AWS_CONTAINER_CREDENTIALS_FULL_URI";
const AWS_CONTAINER_AUTHORIZATION_TOKEN: &str = "AWS_CONTAINER_AUTHORIZATION_TOKEN";
#[derive(Clone, Debug)]
pub struct ContainerProvider {
client: HttpClient,
timeout: Duration,
}
impl ContainerProvider {
pub fn new() -> Self {
ContainerProvider {
client: HttpClient::new(),
timeout: Duration::from_secs(30),
}
}
pub fn set_timeout(&mut self, timeout: Duration) {
self.timeout = timeout;
}
}
impl Default for ContainerProvider {
fn default() -> Self {
Self::new()
}
}
#[async_trait]
impl ProvideAwsCredentials for ContainerProvider {
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError> {
let req = request_from_env_vars().map_err(|err| CredentialsError {
message: format!(
"Could not get request from environment: {}",
err.to_string()
),
})?;
let resp = self
.client
.request(req, self.timeout)
.await
.map_err(|err| CredentialsError {
message: format!(
"Could not get credentials from container: {}",
err.to_string()
),
})?;
parse_credentials_from_aws_service(&resp)
}
}
fn request_from_env_vars() -> Result<Request<Body>, CredentialsError> {
let relative_uri = non_empty_env_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI)
.map(|path| format!("http://{}{}", AWS_CREDENTIALS_PROVIDER_IP, path));
match relative_uri {
Some(ref uri) => new_request(uri, AWS_CONTAINER_CREDENTIALS_RELATIVE_URI),
None => match non_empty_env_var(AWS_CONTAINER_CREDENTIALS_FULL_URI) {
Some(ref uri) => {
let mut request = new_request(uri, AWS_CONTAINER_CREDENTIALS_FULL_URI)?;
if let Some(token) = non_empty_env_var(AWS_CONTAINER_AUTHORIZATION_TOKEN) {
match token.parse() {
Ok(parsed_token) => {
request.headers_mut().insert("authorization", parsed_token);
}
Err(err) => {
return Err(CredentialsError::new(format!(
"failed to parse token: {}",
err
)));
}
}
}
Ok(request)
}
None => Err(CredentialsError::new(format!(
"Neither environment variable '{}' nor '{}' is set",
AWS_CONTAINER_CREDENTIALS_FULL_URI, AWS_CONTAINER_CREDENTIALS_RELATIVE_URI
))),
},
}
}
fn new_request(uri: &str, env_var_name: &str) -> Result<Request<Body>, CredentialsError> {
Request::get(uri).body(Body::empty()).map_err(|error| {
CredentialsError::new(format!(
"Error while parsing URI '{}' derived from environment variable '{}': {}",
uri, env_var_name, error
))
})
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_utils::lock_env;
use std::env;
#[test]
fn request_from_relative_uri() {
let path = "/xxx";
let _guard = lock_env();
env::set_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI, path);
env::set_var(AWS_CONTAINER_CREDENTIALS_FULL_URI, "dummy");
env::set_var(AWS_CONTAINER_AUTHORIZATION_TOKEN, "dummy");
let result = request_from_env_vars();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
env::remove_var(AWS_CONTAINER_AUTHORIZATION_TOKEN);
assert!(result.is_ok());
let request = result.ok().unwrap();
assert_eq!(request.uri().path(), path);
assert_eq!(request.headers().contains_key("authorization"), false);
}
#[test]
fn error_from_missing_env_vars() {
let _guard = lock_env();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
let result = request_from_env_vars();
assert!(result.is_err());
}
#[test]
fn error_from_empty_env_vars() {
let _guard = lock_env();
env::set_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI, "");
env::set_var(AWS_CONTAINER_CREDENTIALS_FULL_URI, "");
env::set_var(AWS_CONTAINER_AUTHORIZATION_TOKEN, "");
let result = request_from_env_vars();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
env::remove_var(AWS_CONTAINER_AUTHORIZATION_TOKEN);
assert!(result.is_err());
}
#[test]
fn request_from_full_uri_with_token() {
let url = "http://localhost/xxx";
let _guard = lock_env();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::set_var(AWS_CONTAINER_CREDENTIALS_FULL_URI, url);
env::set_var(AWS_CONTAINER_AUTHORIZATION_TOKEN, "dummy");
let result = request_from_env_vars();
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
env::remove_var(AWS_CONTAINER_AUTHORIZATION_TOKEN);
assert!(result.is_ok());
let request = result.ok().unwrap();
assert_eq!(request.uri().to_string(), url);
assert_eq!(request.headers().contains_key("authorization"), true);
}
#[test]
fn request_from_full_uri_without_token() {
let url = "http://localhost/xxx";
let _guard = lock_env();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::set_var(AWS_CONTAINER_CREDENTIALS_FULL_URI, url);
env::remove_var(AWS_CONTAINER_AUTHORIZATION_TOKEN);
let result = request_from_env_vars();
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
assert!(result.is_ok());
let request = result.ok().unwrap();
assert_eq!(request.uri().to_string(), url);
assert_eq!(request.headers().contains_key("authorization"), false);
}
#[test]
fn request_from_full_uri_with_empty_token() {
let url = "http://localhost/xxx";
let _guard = lock_env();
env::remove_var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI);
env::set_var(AWS_CONTAINER_CREDENTIALS_FULL_URI, url);
env::set_var(AWS_CONTAINER_AUTHORIZATION_TOKEN, "");
let result = request_from_env_vars();
env::remove_var(AWS_CONTAINER_CREDENTIALS_FULL_URI);
env::remove_var(AWS_CONTAINER_AUTHORIZATION_TOKEN);
assert!(result.is_ok());
let request = result.ok().unwrap();
assert_eq!(request.uri().to_string(), url);
assert_eq!(request.headers().contains_key("authorization"), false);
}
}