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Fix STS endpoint for AWS European Sovereign Cloud and honor endpointOverride #42

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Merged
alesapin merged 2 commits into from
Oct 17, 2026
Merged

Fix STS endpoint for AWS European Sovereign Cloud and honor endpointOverride #42

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c488408
Honor endpointOverride in STSCredentialsClient
asya-ch Oct 16, 2026
f802270
Derive the .amazonaws.eu STS suffix for eusc- regions
asya-ch Oct 16, 2026
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2 changes: 2 additions & 0 deletions src/aws-cpp-sdk-core/include/aws/core/internal/AWSHttpResourceClient.h
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Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,8 @@ namespace Aws

STSAssumeRoleWithWebIdentityResult GetAssumeRoleWithWebIdentityCredentials(const STSAssumeRoleWithWebIdentityRequest& request);

const Aws::String& GetEndpoint() const { return m_endpoint; }

private:
Aws::String m_endpoint;
};
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20 changes: 18 additions & 2 deletions src/aws-cpp-sdk-core/source/internal/AWSHttpResourceClient.cpp
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Expand Up @@ -553,6 +553,13 @@ namespace Aws
{
SetErrorMarshaller(Aws::MakeUnique<Aws::Client::XmlErrorMarshaller>(STS_RESOURCE_CLIENT_LOG_TAG));

if (!clientConfiguration.endpointOverride.empty())
{
m_endpoint = clientConfiguration.endpointOverride;
AWS_LOGSTREAM_INFO(STS_RESOURCE_CLIENT_LOG_TAG, "Creating STS ResourceClient with overridden endpoint: " << m_endpoint);
return;
}

Aws::StringStream ss;
if (clientConfiguration.scheme == Aws::Http::Scheme::HTTP)
{
Expand All @@ -567,10 +574,19 @@ namespace Aws
static const int CN_NORTHWEST_1_HASH = Aws::Utils::HashingUtils::HashString(Aws::Region::CN_NORTHWEST_1);
auto hash = Aws::Utils::HashingUtils::HashString(clientConfiguration.region.c_str());

ss << "sts." << clientConfiguration.region << ".amazonaws.com";
ss << "sts." << clientConfiguration.region << ".amazonaws.";
if (hash == CN_NORTH_1_HASH || hash == CN_NORTHWEST_1_HASH)
{
ss << ".cn";
ss << "com.cn";
}
else if (clientConfiguration.region.rfind("eusc-", 0) == 0)
{
// AWS European Sovereign Cloud regions use the .amazonaws.eu suffix.
ss << "eu";
}
else
{
ss << "com";
}

m_endpoint = ss.str();
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