Use ephemeral S3 buckets for E2E tests

Use S3 buckets created during the lifecycle of a test instead of a
static one and provide the capability to make them read-only public.

Signed-off-by: Arnaud Meukam <[email protected]>

tests/e2e/kubetest2-kops/aws/s3.go

@@ -0,0 +1,155 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package aws
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsconfig "github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+	"github.com/aws/aws-sdk-go-v2/service/sts"
+	"k8s.io/klog/v2"
+)
+
+// It contains S3Client, an Amazon S3 service client that is used to perform bucket
+// and object actions.
+type awsClient struct {
+	S3Client *s3.Client
+}
+
+func AWSBucketName(ctx context.Context) (string, error) {
+	config, err := awsconfig.LoadDefaultConfig(ctx)
+	if err != nil {
+		return "", fmt.Errorf("failed to load AWS config: %w", err)
+	}
+
+	stsSvc := sts.NewFromConfig(config)
+	callerIdentity, err := stsSvc.GetCallerIdentity(ctx, &sts.GetCallerIdentityInput{})
+	if err != nil {
+		return "", fmt.Errorf("building AWS STS presigned request: %w", err)
+	}
+
+	// Add timestamp suffix
+	timestamp := time.Now().Format("01022006")
+	bucket := fmt.Sprintf("k8s-infra-kops-%s", *callerIdentity.Account)
+	bucket = fmt.Sprintf("%s-%s", bucket, timestamp)
+
+	bucket = strings.ToLower(bucket)
+	bucket = regexp.MustCompile("[^a-z0-9-]").ReplaceAllString(bucket, "") // Only allow lowercase letters, numbers, and hyphens
+
+	if len(bucket) > 63 {
+		bucket = bucket[:63] // Max length is 63
+	}
+
+	return bucket, nil
+}
+
+func (client awsClient) EnsureS3Bucket(ctx context.Context, bucketName string, publicRead bool) error {
+	_, err := client.S3Client.CreateBucket(ctx, &s3.CreateBucketInput{
+		Bucket: aws.String(bucketName),
+		CreateBucketConfiguration: &types.CreateBucketConfiguration{
+			LocationConstraint: types.BucketLocationConstraintUsEast2,
+		},
+	})
+
+	var exists *types.BucketAlreadyExists
+	if err != nil {
+		if errors.As(err, &exists) {
+			klog.Infof("Bucket %s already exists.\n", bucketName)
+			err = exists
+		}
+	} else {
+		err := s3.NewBucketExistsWaiter(client.S3Client).Wait(
+			ctx, &s3.HeadBucketInput{
+				Bucket: aws.String(bucketName),
+			},
+			time.Minute)
+		if err != nil {
+			klog.Infof("Failed attempt to wait for bucket %s to exist.", bucketName)
+		}
+	}
+
+	if err == nil && publicRead {
+		err = client.setPublicReadPolicy(ctx, bucketName)
+		if err != nil {
+			klog.Errorf("Failed to set public read policy on bucket %s: %v", bucketName, err)
+			return err
+		}
+		klog.Infof("Public read policy set on bucket %s", bucketName)
+	}
+
+	return err
+}
+
+func (client awsClient) DeleteS3Bucket(ctx context.Context, bucketName string) error {
+	_, err := client.S3Client.DeleteBucket(ctx, &s3.DeleteBucketInput{
+		Bucket: aws.String(bucketName),
+	})
+	if err != nil {
+		var noBucket *types.NoSuchBucket
+		if errors.As(err, &noBucket) {
+			klog.Infof("Bucket %s does not exits", bucketName)
+			err = noBucket
+		} else {
+			klog.Infof("Couldn't delete bucket %s. Reason: %v", bucketName, err)
+		}
+	} else {
+		err = s3.NewBucketNotExistsWaiter(client.S3Client).Wait(
+			ctx, &s3.HeadBucketInput{
+				Bucket: aws.String(bucketName),
+			},
+			time.Minute)
+		if err != nil {
+			klog.Infof("Failed attempt to wait for bucket %s to be deleted", bucketName)
+		} else {
+			klog.Infof("Bucket %s deleted", bucketName)
+		}
+	}
+	return err
+}
+
+func (client awsClient) setPublicReadPolicy(ctx context.Context, bucketName string) error {
+	policy := fmt.Sprintf(`{
+    "Version": "2012-10-17",
+    "Statement": [
+      {
+        "Sid": "PublicReadGetObject",
+        "Effect": "Allow",
+        "Principal": "*",
+        "Action": "s3:GetObject",
+        "Resource": "arn:aws:s3:::%s/*"
+      }
+    ]
+  }`, bucketName)
+
+	_, err := client.S3Client.PutBucketPolicy(ctx, &s3.PutBucketPolicyInput{
+		Bucket: aws.String(bucketName),
+		Policy: aws.String(policy),
+	})
+	if err != nil {
+		return fmt.Errorf("failed to put bucket policy for %s: %w", bucketName, err)
+	}
+
+	return err
+}