feat(redshift): supports excludeCharacters settings for DatabaseSecret (

#30563)

### Issue # (if applicable)

Closes #26847.

### Reason for this change
In the case of passwords generated by [DatabaseSecret](https://docs.aws.amazon.com/cdk/api/v2/docs/@aws-cdk_aws-redshift-alpha.DatabaseSecret.html), there may be a need to exclude certain characters. 

The original issue was to exclude the backtick character from passwords. 
However, the current default value of `excludeCharacters`, `'"@/\ ''`, matches the characters that are not supported in Redshift ([docs](https://docs.aws.amazon.com/redshift/latest/dg/r_CREATE_USER.html#r_CREATE_USER-parameters)).

> It can use any ASCII characters with ASCII codes 33–126, except ' (single quotation mark), " (double quotation mark), \, /, or @.

Instead of including the backtick in the default value of `excludeCharacters`, it was considered appropriate to make it configurable.



### Description of changes
Add `excludeCharacters` property to specify characters to not include in generated passwords.



### Description of how you validated changes
Add unit tests and integ tests.


### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

packages/@aws-cdk/aws-redshift-alpha/README.md

@@ -33,6 +33,20 @@ const cluster = new Cluster(this, 'Redshift', {
 ```
 
 By default, the master password will be generated and stored in AWS Secrets Manager.
+You can specify characters to not include in generated passwords by setting `excludeCharacters` property.
+
+```ts
+import * as ec2 from 'aws-cdk-lib/aws-ec2';
+
+const vpc = new ec2.Vpc(this, 'Vpc');
+const cluster = new Cluster(this, 'Redshift', {
+  masterUser: {
+    masterUsername: 'admin',
+    excludeCharacters: '"@/\\\ \'`',
+  },
+  vpc
+});
+```
 
 A default database named `default_db` will be created in the cluster. To change the name of this database set the `defaultDatabaseName` attribute in the constructor properties.
 
@@ -152,6 +166,16 @@ plaintext for the password will never be present in the CDK application; instead
 Reference](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/dynamic-references.html)
 will be used wherever the password value is required.
 
+You can specify characters to not include in generated passwords by setting `excludeCharacters` property.
+
+```ts fixture=cluster
+new User(this, 'User', {
+  cluster: cluster,
+  databaseName: 'databaseName',
+  excludeCharacters: '"@/\\\ \'`',
+});
+```
+
 ### Creating Tables
 
 Create a table within a Redshift cluster database by instantiating a `Table`
@@ -211,7 +235,7 @@ Tables and their respective columns can be configured to contain comments:
 ```ts fixture=cluster
 new Table(this, 'Table', {
   tableColumns: [
-    { name: 'col1', dataType: 'varchar(4)', comment: 'This is a column comment' }, 
+    { name: 'col1', dataType: 'varchar(4)', comment: 'This is a column comment' },
     { name: 'col2', dataType: 'float', comment: 'This is a another column comment' }
   ],
   cluster: cluster,
@@ -242,7 +266,7 @@ Table columns can also contain an `id` attribute, which can allow table columns
 ```ts fixture=cluster
 new Table(this, 'Table', {
   tableColumns: [
-    { id: 'col1', name: 'col1', dataType: 'varchar(4)' }, 
+    { id: 'col1', name: 'col1', dataType: 'varchar(4)' },
     { id: 'col2', name: 'col2', dataType: 'float' }
   ],
   cluster: cluster,
@@ -580,11 +604,11 @@ new redshift.Cluster(stack, 'Cluster', {
 
 ## Resizing
 
-As your data warehousing needs change, it's possible to resize your Redshift cluster. If the cluster was deployed via CDK, 
-it's important to resize it via CDK so the change is registered in the AWS CloudFormation template. 
+As your data warehousing needs change, it's possible to resize your Redshift cluster. If the cluster was deployed via CDK,
+it's important to resize it via CDK so the change is registered in the AWS CloudFormation template.
 There are two types of resize operations:
 
-* Elastic resize - Number of nodes and node type can be changed, but not at the same time. Elastic resize is the default behavior, 
+* Elastic resize - Number of nodes and node type can be changed, but not at the same time. Elastic resize is the default behavior,
 as it's a fast operation and typically completes in minutes. Elastic resize is only supported on clusters of the following types:
   * dc1.large (if your cluster is in a VPC)
   * dc1.8xlarge (if your cluster is in a VPC)
@@ -596,9 +620,9 @@ as it's a fast operation and typically completes in minutes. Elastic resize is o
   * ra3.4xlarge
   * ra3.16xlarge
 
-* Classic resize - Number of nodes, node type, or both, can be changed. This operation takes longer to complete, 
+* Classic resize - Number of nodes, node type, or both, can be changed. This operation takes longer to complete,
 but is useful when the resize operation doesn't meet the criteria of an elastic resize. If you prefer classic resizing,
 you can set the `classicResizing` flag when creating the cluster.
 
-There are other constraints to be aware of, for example, elastic resizing does not support single-node clusters and there are 
+There are other constraints to be aware of, for example, elastic resizing does not support single-node clusters and there are
 limits on the number of nodes you can add to a cluster. See the [AWS Redshift Documentation](https://docs.aws.amazon.com/redshift/latest/mgmt/managing-cluster-operations.html#rs-resize-tutorial) and [AWS API Documentation](https://docs.aws.amazon.com/redshift/latest/APIReference/API_ResizeCluster.html) for more details.

packages/@aws-cdk/aws-redshift-alpha/lib/cluster.ts

@@ -104,6 +104,13 @@ export interface Login {
    * @default - default master key
    */
   readonly encryptionKey?: kms.IKey;
+
+  /**
+   * Characters to not include in the generated password.
+   *
+   * @default '"@/\\\ \''
+   */
+  readonly excludeCharacters?: string;
 }
 
 /**
@@ -527,6 +534,7 @@ export class Cluster extends ClusterBase {
       secret = new DatabaseSecret(this, 'Secret', {
         username: props.masterUser.masterUsername,
         encryptionKey: props.masterUser.encryptionKey,
+        excludeCharacters: props.masterUser.excludeCharacters,
       });
     }
 

packages/@aws-cdk/aws-redshift-alpha/lib/database-secret.ts

@@ -17,6 +17,13 @@ export interface DatabaseSecretProps {
    * @default default master key
    */
   readonly encryptionKey?: kms.IKey;
+
+  /**
+   * Characters to not include in the generated password.
+   *
+   * @default '"@/\\\ \''
+   */
+  readonly excludeCharacters?: string;
 }
 
 /**
@@ -32,7 +39,7 @@ export class DatabaseSecret extends secretsmanager.Secret {
         passwordLength: 30, // Redshift password could be up to 64 characters
         secretStringTemplate: JSON.stringify({ username: props.username }),
         generateStringKey: 'password',
-        excludeCharacters: '"@/\\\ \'',
+        excludeCharacters: props.excludeCharacters ?? '"@/\\\ \'',
       },
     });
   }

packages/@aws-cdk/aws-redshift-alpha/lib/user.ts

@@ -31,6 +31,13 @@ export interface UserProps extends DatabaseOptions {
    */
   readonly encryptionKey?: kms.IKey;
 
+  /**
+   * Characters to not include in the generated password.
+   *
+   * @default '"@/\\\ \''
+   */
+  readonly excludeCharacters?: string;
+
   /**
    * The policy to apply when this resource is removed from the application.
    *
@@ -153,6 +160,7 @@ export class User extends UserBase {
     const secret = new DatabaseSecret(this, 'Secret', {
       username,
       encryptionKey: props.encryptionKey,
+      excludeCharacters: props.excludeCharacters,
     });
     const attachedSecret = secret.attach(props.cluster);
     this.password = attachedSecret.secretValueFromJson('password');

packages/@aws-cdk/aws-redshift-alpha/test/cluster.test.ts

@@ -132,6 +132,54 @@ test('creates a secret when master credentials are not specified', () => {
   });
 });
 
+test('creates a secret with a custom excludeCharacters', () => {
+  // WHEN
+  new Cluster(stack, 'Redshift', {
+    masterUser: {
+      masterUsername: 'admin',
+      excludeCharacters: '"@/\\\ \'`',
+    },
+    vpc,
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::Redshift::Cluster', {
+    MasterUsername: {
+      'Fn::Join': [
+        '',
+        [
+          '{{resolve:secretsmanager:',
+          {
+            Ref: 'RedshiftSecretA08D42D6',
+          },
+          ':SecretString:username::}}',
+        ],
+      ],
+    },
+    MasterUserPassword: {
+      'Fn::Join': [
+        '',
+        [
+          '{{resolve:secretsmanager:',
+          {
+            Ref: 'RedshiftSecretA08D42D6',
+          },
+          ':SecretString:password::}}',
+        ],
+      ],
+    },
+  });
+
+  Template.fromStack(stack).hasResourceProperties('AWS::SecretsManager::Secret', {
+    GenerateSecretString: {
+      ExcludeCharacters: '"@/\\\ \'`',
+      GenerateStringKey: 'password',
+      PasswordLength: 30,
+      SecretStringTemplate: '{"username":"admin"}',
+    },
+  });
+});
+
 describe('node count', () => {
 
   test('Single Node Clusters do not define node count', () => {