winding-lines commented on code in PR #3541:
URL: https://github.com/apache/arrow-rs/pull/3541#discussion_r1085355009
##########
object_store/src/gcp/credential.rs:
##########
@@ -222,3 +327,118 @@ fn b64_encode_obj<T: serde::Serialize>(obj: &T) ->
Result<String> {
let string = serde_json::to_string(obj).context(EncodeSnafu)?;
Ok(BASE64_URL_SAFE_NO_PAD.encode(string))
}
+
+/// A provider that uses the Google Cloud Platform metadata server to fetch a
token.
+#[derive(Debug, Default)]
+pub struct InstanceCredentialProvider {
+ audience: String,
+}
+
+impl InstanceCredentialProvider {
+ pub fn new<T: Into<String>>(audience: T) -> Self {
+ Self {
+ audience: audience.into(),
+ }
+ }
+}
+
+#[async_trait]
+impl TokenProvider for InstanceCredentialProvider {
+ async fn fetch_token(
+ &self,
+ client: &Client,
+ retry: &RetryConfig,
+ ) -> Result<TemporaryToken<String>> {
+ println!("fetching token from metadata server");
+ const TOKEN_URL: &str =
+
"http://metadata/computeMetadata/v1/instance/service-accounts/default/token";;
+ let response: TokenResponse = client
+ .request(Method::GET, TOKEN_URL)
+ .header("Metadata-Flavor", "Google")
+ .query(&[("audience", &self.audience)])
+ .send_retry(retry)
+ .await
+ .context(TokenRequestSnafu)?
+ .json()
+ .await
+ .context(TokenResponseBodySnafu)?;
+ let token = TemporaryToken {
+ token: response.access_token,
+ expiry: Instant::now() + Duration::from_secs(response.expires_in),
+ };
+ Ok(token)
+ }
+}
+
+/// A deserialized `application_default_credentials.json`-file.
+#[derive(serde::Deserialize, Debug)]
Review Comment:
Nice!
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