fix(eks): nested OCI repository names for private ECR helmchart deployments are not properly handled (#23378)

Fixes #22340

I've changed the way of extracting components (registry domain & region) from repository to regexp with named capture groups. 

I've tested it by extending `integ.eks-helm-asset.ts` with second deployment from manually created private ECR. But I didn't provide coverage for this issue, because before deployment private ECR has to be created and filled by an example chart - i'm not aware of any simple way to automate a second part in tests.

----

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### Adding new Construct Runtime Dependencies:

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### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: psemeniuk

packages/@aws-cdk/aws-eks/lib/kubectl-handler/helm/__init__.py

@@ -6,7 +6,6 @@
 import shutil
 import tempfile
 import zipfile
-from urllib.parse import urlparse, unquote
 
 logger = logging.getLogger()
 logger.setLevel(logging.INFO)
@@ -95,26 +94,25 @@ def helm_handler(event, context):
 
 def get_oci_cmd(repository, version):
     # Generates OCI command based on pattern. Public ECR vs Private ECR are treated differently.
-    cmnd = []
-    private_ecr_pattern = '\d+.dkr.ecr.[a-z]+-[a-z]+-\d.amazonaws.com'
-    public_ecr = 'public.ecr.aws'
+    private_ecr_pattern = 'oci://(?P<registry>\d+.dkr.ecr.(?P<region>[a-z]+-[a-z]+-\d).amazonaws.com)*'
+    public_ecr_pattern = 'oci://(?P<registry>public.ecr.aws)*'
 
-    registry = repository.rsplit('/', 1)[0].replace('oci://', '')
+    private_registry = re.match(private_ecr_pattern, repository).groupdict()
+    public_registry = re.match(public_ecr_pattern, repository).groupdict()
 
-    if re.fullmatch(private_ecr_pattern, registry) is not None:
+    if private_registry['registry'] is not None:
         logger.info("Found AWS private repository")
-        region = registry.replace('.amazonaws.com', '').split('.')[-1]
         cmnd = [
-            f"aws ecr get-login-password --region {region} | " \
-            f"helm registry login --username AWS --password-stdin {registry}; helm pull {repository} --version {version} --untar"
+            f"aws ecr get-login-password --region {private_registry['region']} | " \
+            f"helm registry login --username AWS --password-stdin {private_registry['registry']}; helm pull {repository} --version {version} --untar"
             ]
-    elif registry.startswith(public_ecr):
+    elif public_registry['registry'] is not None:
         logger.info("Found AWS public repository, will use default region as deployment")
         region = os.environ.get('AWS_REGION', 'us-east-1')
 
         cmnd = [
             f"aws ecr-public get-login-password --region {region} | " \
-            f"helm registry login --username AWS --password-stdin {public_ecr}; helm pull {repository} --version {version} --untar"
+            f"helm registry login --username AWS --password-stdin {public_registry['registry']}; helm pull {repository} --version {version} --untar"
             ]
     else:
         logger.error("OCI repository format not recognized, falling back to helm pull")

packages/@aws-cdk/aws-eks/test/integ.eks-helm-asset.ts

@@ -60,6 +60,14 @@ class EksClusterStack extends Stack {
       createNamespace: true,
     });
 
+    // there is no opinionated way of testing charts from private ECR, so there is description of manual steps needed to reproduce:
+    // 1. `export AWS_PROFILE=youraccountprofile; aws ecr create-repository --repository-name helm-charts-test/s3-chart --region YOUR_REGION`
+    // 2. `helm pull oci://public.ecr.aws/aws-controllers-k8s/s3-chart --version v0.1.0`
+    // 3. Login to ECR (howto: https://docs.aws.amazon.com/AmazonECR/latest/userguide/push-oci-artifact.html )
+    // 4. `helm push s3-chart-v0.1.0.tgz oci://YOUR_ACCOUNT_ID.dkr.ecr.YOUR_REGION.amazonaws.com/helm-charts-test/`
+    // 5. Change `repository` in above test to oci://YOUR_ACCOUNT_ID.dkr.ecr.YOUR_REGION.amazonaws.com/helm-charts-test
+    // 6. Run integration tests as usual
+
     this.cluster.addHelmChart('test-oci-chart-different-release-name', {
       chart: 'lambda-chart',
       release: 'lambda-chart-release',
@@ -79,4 +87,3 @@ new integ.IntegTest(app, 'aws-cdk-eks-helm', {
 });
 
 app.synth();
-