GitLab Authorization API

openapi: 3.2.0
info:
  title: GitLab api/v4/ Admin Authorization API
  version: v4
  description: Needs description.
  termsOfService: https://about.gitlab.com/terms/
  license:
    name: CC BY-SA 4.0
    url: https://gitlab.com/gitlab-org/gitlab/-/blob/master/LICENSE
servers:
- url: https://www.gitlab.com/api/
security:
- ApiKeyAuth: []
tags:
- name: Authorization
  description: Endpoints for initiating OAuth authorization flows.
paths:
  /oauth/authorize:
    get:
      operationId: authorizeOAuth
      summary: GitLab Authorize OAuth Application
      description: Initiates the OAuth 2.0 authorization code flow. Redirects the user to the GitLab authorization page where they can grant access to the application. Supports PKCE for public clients by including the code_challenge and code_challenge_method parameters.
      tags:
      - Authorization
      parameters:
      - name: client_id
        in: query
        required: true
        description: The application ID registered in GitLab.
        schema:
          type: string
        example: '123456'
      - name: redirect_uri
        in: query
        required: true
        description: The URI to redirect to after authorization.
        schema:
          type: string
          format: uri
        example: example_value
      - name: response_type
        in: query
        required: true
        description: Must be set to code for the authorization code flow.
        schema:
          type: string
          enum:
          - code
        example: code
      - name: state
        in: query
        required: true
        description: A random, unguessable string used to protect against CSRF attacks. Must be returned unchanged in the redirect response.
        schema:
          type: string
        example: '2026-04-17T12:00:00Z'
      - name: scope
        in: query
        required: false
        description: Space-separated list of scopes to request. Available scopes include api, read_api, read_user, read_repository, write_repository, and others.
        schema:
          type: string
        example: example_value
      - name: code_challenge
        in: query
        required: false
        description: A Base64 URL-encoded SHA-256 hash of the code_verifier. Required when using PKCE for public clients.
        schema:
          type: string
        example: example_value
      - name: code_challenge_method
        in: query
        required: false
        description: The method used to generate the code_challenge. Must be S256.
        schema:
          type: string
          enum:
          - S256
        example: S256
      - name: root_namespace_id
        in: query
        required: false
        description: Optional. Limits group access token creation to a specific namespace.
        schema:
          type: integer
        example: 42
      responses:
        '302':
          description: Redirect to the specified redirect_uri with the authorization code.
        '400':
          description: Bad request due to missing or invalid parameters.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /oauth/authorize_device:
    post:
      operationId: authorizeDevice
      summary: GitLab Initiate Device Authorization Grant
      description: Initiates the OAuth 2.0 device authorization grant flow for input-constrained devices. Returns a device code and user code that the user enters on a secondary device to authorize access.
      tags:
      - Authorization
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/DeviceAuthorizationRequest'
      responses:
        '200':
          description: Device authorization initiated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeviceAuthorizationResponse'
        '400':
          description: Bad request due to invalid client credentials.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    DeviceAuthorizationRequest:
      type: object
      required:
      - client_id
      properties:
        client_id:
          type: string
          description: The application ID registered in GitLab.
          example: '123456'
        scope:
          type: string
          description: Space-separated list of requested scopes.
          example: example_value
    DeviceAuthorizationResponse:
      type: object
      properties:
        device_code:
          type: string
          description: The device verification code used to poll for the access token.
          example: example_value
        user_code:
          type: string
          description: The end-user verification code to enter on the authorization page.
          example: example_value
        verification_uri:
          type: string
          format: uri
          description: The end-user verification URI on the authorization server.
          example: '2026-04-17T12:00:00Z'
        verification_uri_complete:
          type: string
          format: uri
          description: The verification URI that includes the user_code.
          example: '2026-04-17T12:00:00Z'
        expires_in:
          type: integer
          description: The lifetime in seconds of the device_code and user_code.
          example: 42
        interval:
          type: integer
          description: Minimum number of seconds between polling requests.
          example: 42