feat: implement decryption

Signed-off-by: Giovanni De Giorgio <[email protected]>

Author: gioddiggi

libs/providers/aws-ssm/README.md

@@ -30,6 +30,26 @@ OpenFeature.setProvider(
   })
 );
 ```
+
+# AWS SSM Provider Configuration
+
+## AwsSsmProviderConfig
+
+| Property         | Type               | Description                                  | Default |
+|-----------------|--------------------|----------------------------------------------|---------|
+| `ssmClientConfig` | `SSMClientConfig` | AWS SSM Client configuration options.       | See [here](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/ssm/)    |
+| `enableDecryption`      | `boolean`   | Enable decryption for SecureString parameters      | false |
+| `cacheOpts`      | `LRUCacheConfig`   | Configuration for the local LRU cache.      | See below |
+
+## LRUCacheConfig
+
+| Property  | Type    | Description                                    | Default |
+|-----------|--------|------------------------------------------------|---------|
+| `enabled` | `boolean` | Whether caching is enabled.                 | `true`  |
+| `ttl`     | `number`  | Time-to-live (TTL) for cached items (in ms). | `300000` (5 minutes) |
+| `size`    | `number`  | Maximum number of items in the cache.       | `1000`  |
+
+
 ## Retrieve Feature Flag!
 
 Create a new SSM Param called 'my-feature-flag' in your AWS Account and then retrieve it via OpenFeature Client!

libs/providers/aws-ssm/src/lib/aws-ssm-provider.ts

@@ -22,7 +22,7 @@ export class AwsSsmProvider implements Provider {
   cache: Cache;
 
   constructor(config: AwsSsmProviderConfig) {
-    this.service = new SSMService(config.ssmClientConfig);
+    this.service = new SSMService(config.ssmClientConfig, config.enableDecryption);
     this.cache = new Cache(config.cacheOpts);
   }
 

libs/providers/aws-ssm/src/lib/cache.ts

@@ -8,10 +8,10 @@ export class Cache {
   private enabled: boolean;
   constructor(opts: LRUCacheConfig) {
     this.cache = new LRUCache({
-      maxSize: opts.size,
+      maxSize: opts.size ?? 1000,
       sizeCalculation: () => 1,
     });
-    this.ttl = opts.ttl;
+    this.ttl = opts.ttl ?? 300000;
     this.enabled = opts.enabled;
   }
 

libs/providers/aws-ssm/src/lib/ssm-service.ts

@@ -18,9 +18,9 @@ import {
 export class SSMService {
   client: SSMClient;
   enableDecryption: boolean;
-  constructor(config: SSMClientConfig, enableDecryption: boolean = false) {
+  constructor(config: SSMClientConfig, enableDecryption?: boolean) {
     this.client = new SSMClient(config);
-    this.enableDecryption = enableDecryption;
+    this.enableDecryption = enableDecryption ?? false;
   }
 
   async getBooleanValue(name: string): Promise<ResolutionDetails<boolean>> {

libs/providers/aws-ssm/src/lib/types.ts

@@ -3,10 +3,11 @@ import { SSMClientConfig } from '@aws-sdk/client-ssm';
 export type AwsSsmProviderConfig = {
   ssmClientConfig: SSMClientConfig;
   cacheOpts: LRUCacheConfig;
+  enableDecryption?: boolean;
 };
 
 export type LRUCacheConfig = {
   enabled: boolean;
-  ttl: number;
-  size: number;
+  ttl?: number;
+  size?: number;
 };