master refresh tokens in asp net core building from scratch

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creating a master refresh token system in asp.net core involves a couple of steps. this guide will walk you through the process from scratch, including the creation of a web api that uses refresh tokens for authentication.

overview of refresh tokens

refresh tokens are used in conjunction with access tokens in an oauth2 implementation. access tokens are short-lived, while refresh tokens can be used to obtain new access tokens without requiring the user to re-authenticate.

project setup

1. **create a new asp.net core web api project**.

you can do this using the .net cli:

```bash
dotnet new webapi -n authdemo
cd authdemo
```

2. **add necessary packages**.

you will need to install the following nuget packages:

```bash
dotnet add package microsoft.aspnetcore.authentication.jwtbearer
dotnet add package microsoft.identitymodel.tokens
```

3. **create models**.

create a folder named `models` and add the following classes to represent your tokens and user:

```csharp
// models/user.cs
public class user
{
public string username { get; set; }
public string password { get; set; } // in a real app, store hashed passwords
}

// models/tokenresponse.cs
public class tokenresponse
{
public string accesstoken { get; set; }
public string refreshtoken { get; set; }
}
```

4. **configure jwt authentication**.

open `startup.cs` or `program.cs` (depending on your asp.net core version) and configure jwt authentication:

```csharp
public void configureservices(iservicecollection services)
{
// add jwt authentication
services.addauthentication(options =
{
options.defaultauthenticatescheme = jwtbearerdefaults.authenticationscheme;
options.defaultchallengescheme = jwtbearerdefaults.authenticationscheme;
})
.addjwtbearer(options =
{
options.tokenvalidationparameters = new tokenvalidationparameters
...

#MasterRefreshTokens #ASPNETCore #numpy
Master refresh tokens
ASP.NET Core
token management
authentication
authorization
security best practices
token expiration
API security
user sessions
OAuth 2.0
JWT
refresh token flow
secure storage
identity management
application scalability

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