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CleanArchitecture

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Kotlin backend based on the Clean Architecture principles. Ktor, JWT, Exposed, Flyway, OpenAPI/REST & KGraphQL/GraphQL generated endpoints, Gradle.

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# Kotlin Clean Architecture Backend

Kotlin backend based on the Clean Architecture principles.

The application is separated into three modules: Domain, Usecases and Adapters

- Domain module contains all entities, it's validation and repository interfaces
- Usecases module performs actions on the domain entities and repositories and does authorization

The domain and usecases modules do not have any external dependencies.

- Adapter layer: each adapter is implemented as a standalone module, lowering dependence on specific frameworks and
  libraries and making them interchangable. The infrastructure module consumes all adapters (e.g. databases, (graphql)
  endpoints, authentication logic)

GraphQL endpoints are auto-generated from the Usecases

##### Technologies:

Ktor, JWT, Exposed, Flyway, OpenAPI/REST & KGraphQL/GraphQL generated endpoints, Gradle.

![image](https://miro.medium.com/max/800/1*0R0r00uF1RyRFxkxo3HVDg.png)

## OpenAPI REST

Docs URL: http://localhost:8080/docs

API definitions: http://localhost:8080/openapi.json

## GraphQL

Playground URL: http://localhost:8080/graphql

### Login

```
query Login {
  LoginUser(a0: { email: "erik@erikschouten.com", password: "P@ssw0rd!" })
}
```

### Retrieve current user

```
query CurrentUser {
  AuthenticatedUser {
    id
    email
    authorities
  }
}
```

##### HTTP Headers

```
{
  "Authorization": "Bearer [TOKEN FROM LOGIN]"
}
```

### Create new user

```
mutation CreateUser {
  CreateUser(
    a0: {
      email: "calvin@erikschouten.com"
      password: "Penait1!"
      authorities: [USER]
    }
  ) {
    id
    email
    authorities
  }
}
```

##### HTTP Headers

```
{
  "Authorization": "Bearer [TOKEN FROM LOGIN]"
}
```

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