---
date: "2019-04-19:44:00+01:00"
title: "OAuth2 provider"
slug: "oauth2-provider"
weight: 41
toc: false
draft: false
menu:
  sidebar:
    parent: "developers"
    name: "OAuth2 Provider"
    weight: 41
    identifier: "oauth2-provider"
---

# OAuth2 provider

**Table of Contents**

{{< toc >}}

Gitea supports acting as an OAuth2 provider to allow third party applications to access its resources with the user's consent. This feature is available since release 1.8.0.

## Endpoints

| Endpoint                 | URL                                 |
| ------------------------ | ----------------------------------- |
| OpenID Connect Discovery | `/.well-known/openid-configuration` |
| Authorization Endpoint   | `/login/oauth/authorize`            |
| Access Token Endpoint    | `/login/oauth/access_token`         |
| OpenID Connect UserInfo  | `/login/oauth/userinfo`             |
| JSON Web Key Set         | `/login/oauth/keys`                 |

## Supported OAuth2 Grants

At the moment Gitea only supports the [**Authorization Code Grant**](https://tools.ietf.org/html/rfc6749#section-1.3.1) standard with additional support of the following extensions:

- [Proof Key for Code Exchange (PKCE)](https://tools.ietf.org/html/rfc7636)
- [OpenID Connect (OIDC)](https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth)

To use the Authorization Code Grant as a third party application it is required to register a new application via the "Settings" (`/user/settings/applications`) section of the settings.

## Scopes

Currently Gitea does not support scopes (see [#4300](https://github.com/go-gitea/gitea/issues/4300)) and all third party applications will be granted access to all resources of the user and their organizations.

## Client types

Gitea supports both confidential and public client types, [as defined by RFC 6749](https://datatracker.ietf.org/doc/html/rfc6749#section-2.1).

For public clients, a redirect URI of a loopback IP address such as `http://127.0.0.1/` allows any port. Avoid using `localhost`, [as recommended by RFC 8252](https://datatracker.ietf.org/doc/html/rfc8252#section-8.3).

## Example

**Note:** This example does not use PKCE.

1. Redirect to user to the authorization endpoint in order to get their consent for accessing the resources:

   ```curl
   https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI& response_type=code&state=STATE
   ```

   The `CLIENT_ID` can be obtained by registering an application in the settings. The `STATE` is a random string that will be send back to your application after the user authorizes. The `state` parameter is optional but should be used to prevent CSRF attacks.

   ![Authorization Page](/authorize.png)

   The user will now be asked to authorize your application. If they authorize it, the user will be redirected to the `REDIRECT_URL`, for example:

   ```curl
   https://[REDIRECT_URI]?code=RETURNED_CODE&state=STATE
   ```

2. Using the provided `code` from the redirect, you can request a new application and refresh token. The access token endpoints accepts POST requests with `application/json` and `application/x-www-form-urlencoded` body, for example:

   ```curl
   POST https://[YOUR-GITEA-URL]/login/oauth/access_token
   ```

   ```json
   {
     "client_id": "YOUR_CLIENT_ID",
     "client_secret": "YOUR_CLIENT_SECRET",
     "code": "RETURNED_CODE",
     "grant_type": "authorization_code",
     "redirect_uri": "REDIRECT_URI"
   }
   ```

   Response:

   ```json
   {
     "access_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjowLCJleHAiOjE1NTUxNzk5MTIsImlhdCI6MTU1NTE3NjMxMn0.0-iFsAwBtxuckA0sNZ6QpBQmywVPz129u75vOM7wPJecw5wqGyBkmstfJHAjEOqrAf_V5Z-1QYeCh_Cz4RiKug",
     "token_type": "bearer",
     "expires_in": 3600,
     "refresh_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjoxLCJjbnQiOjEsImV4cCI6MTU1NzgwNDMxMiwiaWF0IjoxNTU1MTc2MzEyfQ.S_HZQBy4q9r5SEzNGNIoFClT43HPNDbUdHH-GYNYYdkRfft6XptJBkUQscZsGxOW975Yk6RbgtGvq1nkEcklOw"
   }
   ```

   The `CLIENT_SECRET` is the unique secret code generated for this application. Please note that the secret will only be visible after you created/registered the application with Gitea and cannot be recovered. If you lose the secret you must regenerate the secret via the application's settings.

   The `REDIRECT_URI` in the `access_token` request must match the `REDIRECT_URI` in the `authorize` request.

3. Use the `access_token` to make [API requests](https://docs.gitea.io/en-us/api-usage#oauth2) to access the user's resources.
