Add custom endpoint option to DynamoDB storage adapter (#120)

* add custom endpoint option to dynamostorage provider

* Adds support for a custom DynamoDB endpoint which enables use of a amazon/dynamodb-local container.

* add usage example

Author: raphaeltm

.changeset/young-tips-argue.md

@@ -0,0 +1,14 @@
+---
+"@openauthjs/openauth": patch
+---
+
+Adds support for a custom DynamoDB endpoint which enables use of a amazon/dynamodb-local container.
+
+Usabe example:
+
+```ts
+  storage: DynamoStorage({ 
+    table: 'openauth-users',
+    endpoint: 'http://localhost:8000',
+  }),
+```

packages/openauth/src/storage/dynamo.ts

@@ -47,6 +47,11 @@ export interface DynamoStorageOptions {
    * The sort key column name.
    */
   sk?: string
+  /**
+   * Endpoint URL for the DynamoDB service. Useful for local testing.
+   * @default "https://dynamodb.{region}.amazonaws.com"
+   */
+  endpoint?: string
 }
 
 /**
@@ -74,8 +79,9 @@ export function DynamoStorage(options: DynamoStorageOptions): StorageAdapter {
 
   async function dynamo(action: string, payload: any) {
     const client = await c
+    const endpoint = options.endpoint || `https://dynamodb.${client.region}.amazonaws.com`
     const response = await client.fetch(
-      `https://dynamodb.${client.region}.amazonaws.com`,
+      endpoint,
       {
         method: "POST",
         headers: {