feat(test-server): Add Go V4 test server

.github/workflows/test.yml

@@ -22,6 +22,9 @@ jobs:
         uses: actions/checkout@v5
         with:
           submodules: true
+          # This is Ryan Emery's (seebees) PAT.
+          # To grant this workflow access to a new private repo,
+          # ask Ryan to edit this PAT's permissions to add access to a new private repo.
           token: ${{ secrets.PAT_FOR_PRIVATE_RUBY }}
 
       - name: Checkout CPP code

.gitmodules

@@ -12,6 +12,9 @@
 	path = test-server/php-v3-server/local-php-sdk
 	url = git@github.com:aws/private-aws-sdk-php-staging.git
 	branch = s3ec/improved
+[submodule "test-server/go-v4-server/local-go-s3ec"]
+	path = test-server/go-v4-server/local-go-s3ec
+	url = https://github.com/aws/private-amazon-s3-encryption-client-go-staging
 [submodule "test-server/java-v3-transition-server/s3ec-staging"]
 	path = test-server/java-v3-transition-server/s3ec-staging
 	url = git@github.com:aws/private-amazon-s3-encryption-client-java-staging.git

test-server/go-v4-server/Makefile

@@ -0,0 +1,25 @@
+# Makefile for S3 Encryption Client Testing
+
+.PHONY: start-server stop-server wait-for-server
+
+PID_FILE := server.pid
+PORT := 8089
+
+start-server:
+	@echo "Starting Go V4 server..."
+	go mod tidy
+	AWS_ACCESS_KEY_ID="$$AWS_ACCESS_KEY_ID" \
+	AWS_SECRET_ACCESS_KEY="$$AWS_SECRET_ACCESS_KEY" \
+	AWS_SESSION_TOKEN="$$AWS_SESSION_TOKEN" \
+	AWS_REGION="us-west-2" \
+	go run . & echo $$! > $(PID_FILE)
+	@echo "Go V4 server starting..."
+
+stop-server:
+	@if [ -f $(PID_FILE) ]; then \
+		kill $$(cat $(PID_FILE)) 2>/dev/null || true; \
+		rm $(PID_FILE); \
+	fi
+
+wait-for-server:
+	$(MAKE) -C .. wait-for-port PORT=$(PORT)

test-server/go-v4-server/README.md

@@ -0,0 +1,23 @@
+# S3EC Go V4 Test Server
+
+This is the Go implementation of the S3ECTestServer framework for S3EC Go V4. It provides a server implementation for testing Go S3 Encryption Client V4 functionality.
+
+## Overview
+
+The S3EC Go test server implements the S3ECTestServer service defined in the shared Smithy model. It provides endpoints for:
+
+- Creating S3 Encryption Clients
+- Putting objects with encryption
+- Getting and decrypting objects
+
+## Usage
+
+To run the server:
+
+```console
+go run .
+```
+
+This will start the server running on port `8089`.
+
+The server is used as part of the testing framework to verify cross-language compatibility of the S3 Encryption Client implementations.

test-server/go-v4-server/go.mod

@@ -0,0 +1,35 @@
+module github.com/aws/amazon-s3-encryption-client-python/test-server/go-server
+
+go 1.21
+
+require (
+	github.com/aws/amazon-s3-encryption-client-go/v4 v4.0.0
+	github.com/aws/aws-sdk-go-v2 v1.24.0
+	github.com/aws/aws-sdk-go-v2/config v1.26.1
+	github.com/aws/aws-sdk-go-v2/service/kms v1.27.4
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.47.5
+	github.com/google/uuid v1.5.0
+	github.com/gorilla/mux v1.8.1
+)
+
+require (
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.5.4 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.16.12 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.14.10 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.2.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.5.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.7.2 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.2.9 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.10.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.2.9 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.10.9 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.16.9 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.18.5 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.21.5 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.26.5 // indirect
+	github.com/aws/smithy-go v1.19.0 // indirect
+)
+
+// S3EC Go V4 is not released to pkg.go.dev as of writing.
+// It is included as a submodule and referenced locally.
+replace github.com/aws/amazon-s3-encryption-client-go/v4 => ./local-go-s3ec/v4

test-server/go-v4-server/go.sum

@@ -0,0 +1,45 @@
+
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