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abp/docs/en/UI/Angular/Authorization.md

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## Authorization in Angular UI
OAuth is preconfigured in Angular application templates. So, when you start a project using the CLI (or Suite, for that matter), authorization already works. ABP Angular UI packages are using [angular-oauth2-oidc library](https://github.com/manfredsteyer/angular-oauth2-oidc#logging-in) for managing OAuth in the Angular client.
You can find **OAuth configuration** in the _environment.ts_ files.
### Authorization Code Flow
```js
import { Config } from '@abp/ng.core';
const baseUrl = 'http://localhost:4200';
export const environment = {
// other options removed for sake of brevity
oAuthConfig: {
issuer: 'https://localhost:44305',
redirectUri: baseUrl,
clientId: 'MyProjectName_App',
responseType: 'code',
scope: 'offline_access MyProjectName',
},
// other options removed for sake of brevity
} as Config.Environment;
```
This configuration results in an [OAuth authorization code flow with PKCE](https://tools.ietf.org/html/rfc7636).
According to this flow, the user is redirected to an external login page which is built with MVC. So, if you need **to customize the login page**, please follow [this community article](https://community.abp.io/articles/how-to-customize-the-login-page-for-mvc-razor-page-applications-9a40f3cd).
### Resource Owner Password Flow
If you implemented the [Angular UI account module](./Account-Module) to your project, you can switch the flow to resource owner password flow by changing the OAuth configuration in the _environment.ts_ files as shown below:
```js
import { Config } from '@abp/ng.core';
export const environment = {
// other options removed for sake of brevity
oAuthConfig: {
issuer: 'https://localhost:44305',
clientId: 'MyProjectName_App',
dummyClientSecret: '1q2w3e*',
scope: 'offline_access MyProjectName',
},
// other options removed for sake of brevity
} as Config.Environment;
```
According to this flow, the user is redirected to the login page in the account module.