OpenProject Categories API

openapi: 3.1.2
info:
  description: "You're looking at the current **stable** documentation of the OpenProject APIv3. If you're interested in the current\ndevelopment version, please go to [github.com/opf](https://github.com/opf/openproject/tree/dev/docs/api/apiv3).\n\n## Introduction\n\nThe documentation for the APIv3 is written according to the [OpenAPI 3.1 Specification](https://swagger.io/specification/).\nYou can either view the static version of this documentation on the [website](https://www.openproject.org/docs/api/introduction/)\nor the interactive version, rendered with [OpenAPI Explorer](https://github.com/Rhosys/openapi-explorer/blob/main/README.md),\nin your OpenProject installation under `/api/docs`.\nIn the latter you can try out the various API endpoints directly interacting with our OpenProject data.\nMoreover you can access the specification source itself under `/api/v3/spec.json` and `/api/v3/spec.yml`\n(e.g. [here](https://community.openproject.org/api/v3/spec.yml)).\n\nThe APIv3 is a hypermedia REST API, a shorthand for \"Hypermedia As The Engine Of Application State\" (HATEOAS).\nThis means that each endpoint of this API will have links to other resources or actions defined in the resulting body.\n\nThese related resources and actions for any given resource will be context sensitive. For example, only actions that the\nauthenticated user can take are being rendered. This can be used to dynamically identify actions that the user might take for any\ngiven response.\n\nAs an example, if you fetch a work package through the [Work Package endpoint](https://www.openproject.org/docs/api/endpoints/work-packages/), the `update` link will only\nbe present when the user you authenticated has been granted a permission to update the work package in the assigned project.\n\n## HAL+JSON\n\nHAL is a simple format that gives a consistent and easy way to hyperlink between resources in your API.\nRead more in the following specification: [https://tools.ietf.org/html/draft-kelly-json-hal-08](https://tools.ietf.org/html/draft-kelly-json-hal-08)\n\n**OpenProject API implementation of HAL+JSON format** enriches JSON and introduces a few meta properties:\n\n- `_type` - specifies the type of the resource (e.g.: WorkPackage, Project)\n- `_links` - contains all related resource and action links available for the resource\n- `_embedded` - contains all embedded objects\n\nHAL does not guarantee that embedded resources are embedded in their full representation, they might as well be\npartially represented (e.g. some properties can be left out).\nHowever in this API you have the guarantee that whenever a resource is **embedded**, it is embedded in its **full representation**.\n\n## API response structure\n\nAll API responses contain a single HAL+JSON object, even collections of objects are technically represented by\na single HAL+JSON object that itself contains its members. More details on collections can be found\nin the [Collections Section](https://www.openproject.org/docs/api/collections/).\n\n## Authentication\n\nThe API supports the following authentication schemes:\n\n* Session-based authentication\n* API tokens\n    * passed as Bearer token\n    * passed via Basic auth\n* OAuth 2.0\n    * using built-in authorization server\n    * using an external authorization server (RFC 9068)\n\nDepending on the settings of the OpenProject instance many resources can be accessed without being authenticated.\nIn case the instance requires authentication on all requests the client will receive an **HTTP 401** status code\nin response to any request.\n\nOtherwise unauthenticated clients have all the permissions of the anonymous user.\n\n### Session-based authentication\n\nThis means you have to login to OpenProject via the Web-Interface to be authenticated in the API.\nThis method is well-suited for clients acting within the browser, like the Angular-Client built into OpenProject.\n\nIn this case, you always need to pass the HTTP header `X-Requested-With \"XMLHttpRequest\"` for authentication.\n\n### API token as bearer token\n\nUsers can authenticate towards the API v3 using an API token as a bearer token.\n\nFor example:\n\n```shell\nAPI_KEY=opapi-2519132cdf62dcf5a66fd96394672079f9e9cad1\ncurl -H \"Authorization: Bearer $API_KEY\" https://community.openproject.org/api/v3/users/42\n```\n\nUsers can generate API tokens on their account page.\n\n### API token through Basic Auth\n\nAPI tokens can also be used with basic auth, using the user name `apikey` (NOT your login) and the API token as the password.\n\nFor example:\n\n```shell\nAPI_KEY=opapi-2519132cdf62dcf5a66fd96394672079f9e9cad1\ncurl -u apikey:$API_KEY https://community.openproject.org/api/v3/users/42\n```\n\n### OAuth 2.0 authentication\n\nOpenProject allows authentication and authorization with OAuth2 with *Authorization code flow*, as well as *Client credentials* operation modes.\n\nTo get started, you first need to register an application in the OpenProject OAuth administration section of your installation.\nThis will save an entry for your application with a client unique identifier (`client_id`) and an accompanying secret key (`client_secret`).\n\nYou can then use one the following guides to perform the supported OAuth 2.0 flows:\n\n- [Authorization code flow](https://oauth.net/2/grant-types/authorization-code)\n\n- [Authorization code flow with PKCE](https://doorkeeper.gitbook.io/guides/ruby-on-rails/pkce-flow), recommended for clients unable to keep the client_secret confidential\n\n- [Client credentials](https://oauth.net/2/grant-types/client-credentials/) - Requires an application to be bound to an impersonating user for non-public access\n\n### OAuth 2.0 using an external authorization server\n\nThere is a possibility to use JSON Web Tokens (JWT) generated by an OIDC provider configured in OpenProject as a bearer token to do authenticated requests against the API.\nThe following requirements must be met:\n\n- OIDC provider must be configured in OpenProject with **jwks_uri**\n- JWT must be signed using RSA algorithm\n- JWT **iss** claim must be equal to OIDC provider **issuer**\n- JWT **aud** claim must contain the OpenProject **client ID** used at the OIDC provider\n- JWT **scope** claim must include a valid scope to access the desired API (e.g. `api_v3` for APIv3)\n- JWT must be actual (neither expired or too early to be used)\n- JWT must be passed in Authorization header like: `Authorization: Bearer {jwt}`\n- User from **sub** claim must be linked to OpenProject before (e.g. by logging in), otherwise it will be not authenticated\n\nIn more general terms, OpenProject should be compliant to [RFC 9068](https://www.rfc-editor.org/rfc/rfc9068) when validating access tokens.\n\n### Why not username and password?\n\nThe simplest way to do basic auth would be to use a user's username and password naturally.\nHowever, OpenProject already has supported API keys in the past for the API v2, though not through basic auth.\n\nUsing **username and password** directly would have some advantages:\n\n* It is intuitive for the user who then just has to provide those just as they would when logging into OpenProject.\n\n* No extra logic for token management necessary.\n\nOn the other hand using **API keys** has some advantages too, which is why we went for that:\n\n* If compromised while saved on an insecure client the user only has to regenerate the API key instead of changing their password, too.\n\n* They are naturally long and random which makes them invulnerable to dictionary attacks and harder to crack in general.\n\nMost importantly users may not actually have a password to begin with. Specifically when they have registered\nthrough an OpenID Connect provider.\n\n## Cross-Origin Resource Sharing (CORS)\n\nBy default, the OpenProject API is _not_ responding with any CORS headers.\nIf you want to allow cross-domain AJAX calls against your OpenProject instance, you need to enable CORS headers being returned.\n\nPlease see [our API settings documentation](https://www.openproject.org/docs/system-admin-guide/api-and-webhooks/) on\nhow to selectively enable CORS.\n\n## Allowed HTTP methods\n\n- `GET` - Get a single resource or collection of resources\n\n- `POST` - Create a new resource or perform\n\n- `PATCH` - Update a resource\n\n- `DELETE` - Delete a resource\n\n## Compression\n\nResponses are compressed if requested by the client. Currently [gzip](https://www.gzip.org/) and [deflate](https://tools.ietf.org/html/rfc1951)\nare supported. The client signals the desired compression by setting the [`Accept-Encoding` header](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3).\nIf no `Accept-Encoding` header is send, `Accept-Encoding: identity` is assumed which will result in the API responding uncompressed."
  title: OpenProject API V3 (Stable) Actions & Capabilities Categories API
  version: '3'
servers:
- url: https://qa.openproject-edge.com
  description: Edge QA instance
- url: https://qa.openproject-stage.com
  description: Staging instance
- url: https://community.openproject.org
  description: Community instance
security:
- BasicAuth: []
tags:
- description: 'The categories endpoints return collections or single entities of type `Category`. The following tables list the different properties

    of `Category` entities.


    ## Linked Properties


    |  Link           | Description                                         | Type          | Constraints | Supported operations |

    |:---------------:| --------------------------------------------------- | ------------- | ----------- | -------------------- |

    | self            | This category                                       | Category      | not null    | READ                 |

    | project         | The project of this category                        | Project       | not null    | READ                 |

    | defaultAssignee | Default assignee for work packages of this category | User          |             | READ                 |


    ## Local Properties


    | Property   | Description   | Type    | Constraints | Supported operations |

    | :--------: | ------------- | ------- | ----------- | -------------------- |

    | id         | Category id   | Integer | x > 0       | READ                 |

    | name       | Category name | String  |             | READ                 |'
  name: Categories
paths:
  /api/v3/categories/{id}:
    get:
      parameters:
      - description: Category id
        example: '1'
        in: path
        name: id
        required: true
        schema:
          type: integer
      responses:
        '200':
          content:
            application/hal+json:
              examples:
                response:
                  value:
                    _links:
                      defaultAssignee:
                        href: /api/v3/users/42
                        title: John Sheppard
                      project:
                        href: /api/v3/projects/11
                        title: Example project
                      self:
                        href: /api/v3/categories/10
                        title: Category with assignee
                    _type: Category
                    id: 10
                    name: Foo
              schema:
                $ref: '#/components/schemas/CategoryModel'
          description: OK
          headers: {}
        '404':
          content:
            application/hal+json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              examples:
                response:
                  value:
                    _type: Error
                    errorIdentifier: urn:openproject-org:api:v3:errors:NotFound
                    message: The specified category does not exist.
          description: 'Returned if the category does not exist or the client does not have sufficient permissions

            to see it.


            **Required permission:** view project (defining the category)


            *Note: A client without sufficient permissions shall not be able to test for the existence of

            a category. That''s why a 404 is returned here, even if a 403 might be more appropriate.*'
          headers: {}
      tags:
      - Categories
      description: ''
      operationId: View_Category
      summary: View Category
  /api/v3/projects/{id}/categories:
    get:
      parameters:
      - description: ID of the project whose categories will be listed
        example: 1
        in: path
        name: id
        required: true
        schema:
          type: integer
      responses:
        '200':
          content:
            application/hal+json:
              examples:
                response:
                  value:
                    _embedded:
                      elements:
                      - _links:
                          defaultAssignee:
                            href: /api/v3/users/42
                            title: John Sheppard
                          project:
                            href: /api/v3/projects/11
                            title: Example project
                          self:
                            href: /api/v3/categories/10
                            title: Category with assignee
                        _type: Category
                        id: 10
                        name: Foo
                      - _links:
                          project:
                            href: /api/v3/projects/11
                          self:
                            href: /api/v3/categories/11
                        _type: Category
                        id: 11
                        name: Bar
                    _links:
                      self:
                        href: /api/v3/projects/11/categories
                    _type: Collection
                    count: 2
                    total: 2
              schema:
                $ref: '#/components/schemas/Categories_by_WorkspaceModel'
          description: OK
          headers: {}
        '404':
          content:
            application/hal+json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              examples:
                response:
                  value:
                    _type: Error
                    errorIdentifier: urn:openproject-org:api:v3:errors:NotFound
                    message: The specified project does not exist.
          description: 'Returned if the project does not exist or the client does not have sufficient permissions

            to see it.


            **Required permission:** view project


            *Note: A client without sufficient permissions shall not be able to test for the existence of a project.

            That''s why a 404 is returned here, even if a 403 might be more appropriate.*'
          headers: {}
      tags:
      - Categories
      description: 'List all categories of a project

        This endpoint is deprecated and replaced by [`/api/v3/workspaces/{id}/categories`](https://www.openproject.org/docs/api/endpoints/categories/#list-categories-of-a-workspace) '
      operationId: List_categories_of_a_project
      summary: List categories of a project
  /api/v3/workspaces/{id}/categories:
    get:
      parameters:
      - description: ID of the workspace whose categories will be listed
        example: 1
        in: path
        name: id
        required: true
        schema:
          type: integer
      responses:
        '200':
          content:
            application/hal+json:
              examples:
                response:
                  value:
                    _embedded:
                      elements:
                      - _links:
                          defaultAssignee:
                            href: /api/v3/users/42
                            title: John Sheppard
                          project:
                            href: /api/v3/projects/11
                            title: Example project
                          self:
                            href: /api/v3/categories/10
                            title: Category with assignee
                        _type: Category
                        id: 10
                        name: Foo
                      - _links:
                          project:
                            href: /api/v3/projects/11
                          self:
                            href: /api/v3/categories/11
                        _type: Category
                        id: 11
                        name: Bar
                    _links:
                      self:
                        href: /api/v3/projects/11/categories
                    _type: Collection
                    count: 2
                    total: 2
              schema:
                $ref: '#/components/schemas/Categories_by_WorkspaceModel'
          description: OK
          headers: {}
        '404':
          content:
            application/hal+json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              examples:
                response:
                  value:
                    _type: Error
                    errorIdentifier: urn:openproject-org:api:v3:errors:NotFound
                    message: The specified project does not exist.
          description: 'Returned if the workspace does not exist or the client does not have sufficient permissions

            to see it.


            **Required permission:** view workspace


            *Note: A client without sufficient permissions shall not be able to test for the existence of a workspace.

            That''s why a 404 is returned here, even if a 403 might be more appropriate.*'
          headers: {}
      tags:
      - Categories
      description: List all categories of a project
      operationId: List_categories_of_a_workspace
      summary: List categories of a workspace
components:
  schemas:
    CollectionModel:
      type: object
      required:
      - _type
      - total
      - count
      - _links
      properties:
        _type:
          type: string
          enum:
          - Collection
        total:
          type: integer
          description: The total amount of elements available in the collection.
          minimum: 0
        count:
          type: integer
          description: Actual amount of elements in this response.
          minimum: 0
        _links:
          $ref: '#/components/schemas/CollectionLinks'
    CollectionLinks:
      type: object
      required:
      - self
      properties:
        self:
          allOf:
          - $ref: '#/components/schemas/Link'
          - description: 'This collection resource.


              **Resource**: Collection'
    Link:
      type: object
      required:
      - href
      properties:
        href:
          type:
          - string
          - 'null'
          description: URL to the referenced resource (might be relative)
        title:
          type: string
          description: Representative label for the resource
        templated:
          type: boolean
          default: false
          description: If true the href contains parts that need to be replaced by the client
        method:
          type: string
          default: GET
          description: The HTTP verb to use when requesting the resource
        payload:
          type: object
          description: The payload to send in the request to achieve the desired result
        identifier:
          type: string
          description: An optional unique identifier to the link object
        type:
          type: string
          description: The MIME-Type of the returned resource.
      example:
        href: /api/v3/work_packages
        method: POST
    CategoryModel:
      type: object
      properties:
        id:
          type: integer
          description: Category id
          readOnly: true
          exclusiveMinimum: 0
        name:
          type: string
          description: Category name
        _links:
          type: object
          required:
          - self
          - project
          properties:
            self:
              allOf:
              - $ref: '#/components/schemas/Link'
              - description: 'This category


                  **Resource**: Category'
                readOnly: true
            project:
              allOf:
              - $ref: '#/components/schemas/Link'
              - description: 'The project of this category


                  **Resource**: Project'
                readOnly: true
            defaultAssignee:
              allOf:
              - $ref: '#/components/schemas/Link'
              - description: 'Default assignee for work packages of this category


                  **Resource**: User'
                readOnly: true
      example:
        _links:
          self:
            href: /api/v3/categories/10
            title: Category with assignee
          project:
            href: /api/v3/projects/11
            title: Example project
          defaultAssignee:
            href: /api/v3/users/42
            title: John Sheppard
        _type: Category
        id: 10
        name: Foo
    ErrorResponse:
      type: object
      required:
      - _type
      - errorIdentifier
      - message
      properties:
        _embedded:
          type: object
          properties:
            details:
              type: object
              properties:
                attribute:
                  type: string
                  example: project
        _type:
          type: string
          enum:
          - Error
        errorIdentifier:
          type: string
          example: urn:openproject-org:api:v3:errors:PropertyConstraintViolation
        message:
          type: string
          example: Project can't be blank.
    Categories_by_WorkspaceModel:
      allOf:
      - $ref: '#/components/schemas/CollectionModel'
      - type: object
        required:
        - _links
        - _embedded
        properties:
          _links:
            type: object
            required:
            - self
            properties:
              self:
                allOf:
                - $ref: '#/components/schemas/Link'
                - description: 'The categories collection


                    **Resource**: CategoriesCollection'
                  readOnly: true
          _embedded:
            type: object
            properties:
              elements:
                type: array
                readOnly: true
                items:
                  allOf:
                  - $ref: '#/components/schemas/CategoryModel'
                  - description: Collection of Categories
  securitySchemes:
    BasicAuth:
      type: http
      scheme: basic