dwsmith1983 commented on code in PR #5872:
URL: https://github.com/apache/datafusion-comet/pull/5872#discussion_r4174430247
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native/core/src/parquet/objectstore/s3.rs:
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@@ -1000,11 +1174,80 @@ impl CredentialProviderMetadata {
}
}
+/// The STS region the Java SDK falls back to for a role profile when no
region is found.
+const STS_FALLBACK_REGION: &str = "us-east-1";
+
+/// Builds the profile credentials provider on `provider_config`, with
`default_region` standing
+/// in for the SDK's default region chain.
+async fn build_profile_provider(
+ provider_config: ProviderConfig,
+ default_region: &impl ProvideRegion,
+ name: Option<&str>,
+ file: Option<&str>,
+ credentials_only: bool,
+) -> ProfileFileCredentialsProvider {
+ // Hadoop's ProfileAWSCredentialsProvider loads the configured file, or
the shared
+ // credentials file, as a credentials-format file and reads nothing else,
so a same-name
+ // role profile in the SDK's config file never applies.
+ let credentials_file = match (file, credentials_only) {
+ (Some(file), _) => Some(file.to_string()),
+ (None, true) => Some(default_shared_credentials_file(
+ std::env::var("AWS_SHARED_CREDENTIALS_FILE").ok(),
+ std::env::var("HOME").ok(),
+ )),
+ (None, false) => None,
+ };
+ let profile_files = credentials_file.map(|file| {
+ EnvConfigFiles::builder()
+ .with_file(EnvConfigFileKind::Credentials, file)
+ .build()
+ });
+ let region = if credentials_only {
+ // The Java SDK sends a role profile's STS request to the profile's
own `region`, then
+ // to its default region chain's, then to us-east-1. The region
provider here also
+ // tries the profile's `source_profile` chain before the default
chain. A file that
+ // fails to load yields no region here and surfaces from the
credentials provider.
+ let mut region_provider =
ProfileFileRegionProvider::builder().configure(&provider_config);
+ if let Some(name) = name {
+ region_provider = region_provider.profile_name(name);
+ }
+ if let Some(files) = &profile_files {
+ region_provider = region_provider.profile_files(files.clone());
+ }
+ // The default chain can probe IMDS, so it runs only when the profile
has no region.
+ let region = match
ProvideRegion::region(®ion_provider.build()).await {
+ Some(region) => region,
+ None => default_region
+ .region()
+ .await
+ .unwrap_or_else(|| Region::from_static(STS_FALLBACK_REGION)),
Review Comment:
Superseded by aa73a0d6c: the profile provider now resolves through
`HadoopS3ACredentialProviderAdapter`, so the no-region fallback is the Java
SDK's own `sts.amazonaws.com`, signed for us-east-1, including for
`credential_source` chains. Details in
https://github.com/apache/datafusion-comet/pull/5872#discussion_r4173866124.
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