---
lang: en
title: 'API docs: authentication.strategyadapter'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.authentication.strategyadapter.html
---

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[Home](./index.md) &gt; [@loopback/authentication](./authentication.md) &gt; [StrategyAdapter](./authentication.strategyadapter.md)

## StrategyAdapter class

> Warning: This API is now obsolete.
> 
> THIS CLASS IS DEPRECATED. We will be adding a new package to implement one or more new passport strategy adapters.
> 
> Adapter class to invoke passport-strategy 1. provides express dependencies to the passport strategies 2. provides shimming of requests for passport authentication 3. provides lifecycle similar to express to the passport-strategy 3. provides state methods to the strategy instance see: https://github.com/jaredhanson/passport
> 

<b>Signature:</b>

```typescript
export declare class StrategyAdapter 
```

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(strategy)](./authentication.strategyadapter.(constructor).md) |  | Constructs a new instance of the <code>StrategyAdapter</code> class |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [authenticate(request)](./authentication.strategyadapter.authenticate.md) |  | The function to invoke the contained passport strategy. 1. Create an instance of the strategy 2. add success and failure state handlers 3. authenticate using the strategy |


