129 lines
4.0 KiB
Rust
129 lines
4.0 KiB
Rust
pub use goauth::scopes::Scope;
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/// A module for managing a Google API access token
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use {
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crate::CredentialType,
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goauth::{
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auth::{JwtClaims, Token},
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credentials::Credentials,
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},
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log::*,
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smpl_jwt::Jwt,
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std::{
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str::FromStr,
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sync::{
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atomic::{AtomicBool, Ordering},
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{Arc, RwLock},
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},
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time::Instant,
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},
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};
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fn load_credentials(filepath: Option<String>) -> Result<Credentials, String> {
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let path = match filepath {
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Some(f) => f,
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None => std::env::var("GOOGLE_APPLICATION_CREDENTIALS").map_err(|_| {
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"GOOGLE_APPLICATION_CREDENTIALS environment variable not found".to_string()
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})?,
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};
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Credentials::from_file(&path)
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.map_err(|err| format!("Failed to read GCP credentials from {}: {}", path, err))
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}
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fn load_stringified_credentials(credential: String) -> Result<Credentials, String> {
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Credentials::from_str(&credential).map_err(|err| format!("{}", err))
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}
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#[derive(Clone)]
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pub struct AccessToken {
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credentials: Credentials,
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scope: Scope,
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refresh_active: Arc<AtomicBool>,
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token: Arc<RwLock<(Token, Instant)>>,
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}
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impl AccessToken {
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pub async fn new(scope: Scope, credential_type: CredentialType) -> Result<Self, String> {
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let credentials = match credential_type {
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CredentialType::Filepath(fp) => load_credentials(fp)?,
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CredentialType::Stringified(s) => load_stringified_credentials(s)?,
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};
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if let Err(err) = credentials.rsa_key() {
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Err(format!("Invalid rsa key: {}", err))
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} else {
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let token = Arc::new(RwLock::new(Self::get_token(&credentials, &scope).await?));
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let access_token = Self {
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credentials,
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scope,
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token,
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refresh_active: Arc::new(AtomicBool::new(false)),
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};
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Ok(access_token)
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}
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}
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/// The project that this token grants access to
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pub fn project(&self) -> String {
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self.credentials.project()
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}
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async fn get_token(
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credentials: &Credentials,
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scope: &Scope,
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) -> Result<(Token, Instant), String> {
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info!("Requesting token for {:?} scope", scope);
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let claims = JwtClaims::new(
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credentials.iss(),
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scope,
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credentials.token_uri(),
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None,
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None,
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);
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let jwt = Jwt::new(claims, credentials.rsa_key().unwrap(), None);
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let token = goauth::get_token(&jwt, credentials)
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.await
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.map_err(|err| format!("Failed to refresh access token: {}", err))?;
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info!("Token expires in {} seconds", token.expires_in());
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Ok((token, Instant::now()))
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}
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/// Call this function regularly to ensure the access token does not expire
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pub async fn refresh(&self) {
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// Check if it's time to try a token refresh
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{
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let token_r = self.token.read().unwrap();
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if token_r.1.elapsed().as_secs() < token_r.0.expires_in() as u64 / 2 {
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return;
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}
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#[allow(deprecated)]
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if self
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.refresh_active
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.compare_and_swap(false, true, Ordering::Relaxed)
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{
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// Refresh already pending
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return;
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}
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}
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info!("Refreshing token");
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let new_token = Self::get_token(&self.credentials, &self.scope).await;
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{
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let mut token_w = self.token.write().unwrap();
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match new_token {
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Ok(new_token) => *token_w = new_token,
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Err(err) => warn!("{}", err),
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}
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self.refresh_active.store(false, Ordering::Relaxed);
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}
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}
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/// Return an access token suitable for use in an HTTP authorization header
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pub fn get(&self) -> String {
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let token_r = self.token.read().unwrap();
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format!("{} {}", token_r.0.token_type(), token_r.0.access_token())
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}
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}
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