add KMSKeyRef inside DBCluster and DBInstance (#71)

Issue #, if available: aws-controllers-k8s/community#1258

Description of changes:
* Add reference for KMSKey inside DBCluster and DBInstance crds
* Currently there is no support to test cross-controller resource reference. Once aws-controllers-k8s/community#1266 is resolved, I will add automated e2e tests
* I manually tested the referencing KMSKey inside DBInstance works as expected.

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

Author: vijtrip2

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2022-04-15T17:51:27Z"
-  build_hash: 50c64871bcaf88b9ee200eb8d6b8245fa8f675eb
+  build_date: "2022-04-19T21:22:13Z"
+  build_hash: db274dc04c0ad2b6a7fc5a8c364909f3cd45ec6c
   go_version: go1.17.5
-  version: v0.18.4
-api_directory_checksum: c5762d0b5707ca20866f2f0e85bc23863733ca11
+  version: v0.18.4-3-gdb274dc
+api_directory_checksum: e7bbd21f4f975f9cf1e1e804ebd450e8e310023d
 api_version: v1alpha1
 aws_sdk_go_version: v1.42.0
 generator_config_info:
-  file_checksum: 3afea95265e7836112e0b1e37166290f18511d09
+  file_checksum: 9526e946bbd1d8b3b4c76b010966f6c0158a6941
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/db_cluster.go

@@ -92,6 +92,11 @@ resources:
         is_primary_key: true
       MasterUserPassword:
         is_secret: true
+      KmsKeyId:
+        references:
+          resource: Key
+          service_name: kms
+          path: Status.ACKResourceMetadata.ARN
   DBClusterParameterGroup:
     renames:
       operations:
@@ -156,6 +161,11 @@ resources:
             from: DBSecurityGroupName
       MasterUserPassword:
         is_secret: true
+      KmsKeyId:
+        references:
+          resource: Key
+          service_name: kms
+          path: Status.ACKResourceMetadata.ARN
   GlobalCluster:
     exceptions:
       terminal_codes:

apis/v1alpha1/db_instance.go

@@ -218,6 +218,20 @@ spec:
                   destination Amazon Web Services Region. This KMS key is used to
                   encrypt the read replica in that Amazon Web Services Region."
                 type: string
+              kmsKeyRef:
+                description: 'AWSResourceReferenceWrapper provides a wrapper around
+                  *AWSResourceReference type to provide more user friendly syntax
+                  for references using ''from'' field Ex: APIIDRef:   from:     name:
+                  my-api'
+                properties:
+                  from:
+                    description: AWSResourceReference provides all the values necessary
+                      to reference another k8s resource for finding the identifier(Id/ARN/Name)
+                    properties:
+                      name:
+                        type: string
+                    type: object
+                type: object
               masterUserPassword:
                 description: "The password for the master database user. This password
                   can contain any printable ASCII character except \"/\", \"\"\",

apis/v1alpha1/generator.yaml

@@ -358,6 +358,20 @@ spec:
                   key when this parameter is empty. You must explicitly specify a
                   key."
                 type: string
+              kmsKeyRef:
+                description: 'AWSResourceReferenceWrapper provides a wrapper around
+                  *AWSResourceReference type to provide more user friendly syntax
+                  for references using ''from'' field Ex: APIIDRef:   from:     name:
+                  my-api'
+                properties:
+                  from:
+                    description: AWSResourceReference provides all the values necessary
+                      to reference another k8s resource for finding the identifier(Id/ARN/Name)
+                    properties:
+                      name:
+                        type: string
+                    type: object
+                type: object
               licenseModel:
                 description: "License model information for this DB instance. \n Valid
                   values: license-included | bring-your-own-license | general-public-license

apis/v1alpha1/zz_generated.deepcopy.go

@@ -32,6 +32,20 @@ rules:
   - list
   - patch
   - watch
+- apiGroups:
+  - kms.services.k8s.aws
+  resources:
+  - keys
+  verbs:
+  - get
+  - list
+- apiGroups:
+  - kms.services.k8s.aws
+  resources:
+  - keys/status
+  verbs:
+  - get
+  - list
 - apiGroups:
   - rds.services.k8s.aws
   resources:

cmd/controller/main.go

@@ -92,6 +92,11 @@ resources:
         is_primary_key: true
       MasterUserPassword:
         is_secret: true
+      KmsKeyId:
+        references:
+          resource: Key
+          service_name: kms
+          path: Status.ACKResourceMetadata.ARN
   DBClusterParameterGroup:
     renames:
       operations:
@@ -156,6 +161,11 @@ resources:
             from: DBSecurityGroupName
       MasterUserPassword:
         is_secret: true
+      KmsKeyId:
+        references:
+          resource: Key
+          service_name: kms
+          path: Status.ACKResourceMetadata.ARN
   GlobalCluster:
     exceptions:
       terminal_codes: