docs/app/api/endpoints/page.mdx

export const metadata = {
    title: "API Endpoints",
    description: "Explains all endpoints in Versia's federation API.",
}

# Endpoints

## Well-known

<Warning>
    This endpoint is exempt from the signature requirement. No signatures are required for requests or responses to it.

    The following `Accept` headers are also allowed for requests to this endpoint:
    - `application/jrd+json`
    - `application/json`
</Warning>

<Row>
  <Col>

    <Properties name="Well-known">
        <Property name="endpoint">
            Must be `/.well-known/versia`.
        </Property>
        <Property name="method">
            Must be `GET`.
        </Property>
        <Property name="response">
            A small JSON object with a single attribute:

            - `versions`: Supported Versia Protocol versions.
                  - Versions marked as "Working Draft X" are represented as `0.X`.
        </Property>
    </Properties>

  </Col>
  <Col sticky>

    ```http {{ 'title': 'Example request' }}
    GET /.well-known/versia
    Host: b.social
    Accept: application/jrd+json
    ```
    
    ```http {{ 'title': 'Example response' }}
    HTTP/1.1 200 OK
    Content-Type: application/jrd+json

    {
        "versions": [
            "0.6.0",
            "0.5.0"
        ]
    }
    ```

  </Col>
</Row>

## Instance metadata

<Warning>
    This endpoint is exempt from the signature requirement. No signatures are required for requests or responses to it.
</Warning>

<Row>
  <Col>

    <Properties name="InstanceMetadata">
        <Property name="endpoint">
            Must be `/.versia/v0.6/instance`.
        </Property>
        <Property name="method">
            Must be `GET`.
        </Property>
        <Property name="response">
            Instance's metadata, as defined in the [Instance Metadata](/entities/instance-metadata) document.
        </Property>
    </Properties>

  </Col>
  <Col sticky>

    ```http {{ 'title': 'Example request' }}
    GET /.versia/v0.6/instance
    Host: b.social
    Accept: application/vnd.versia+json
    ```
    
    ```http {{ 'title': 'Example response' }}
    HTTP/1.1 200 OK
    Content-Type: application/vnd.versia+json; charset=utf-8

    {
        "type": "InstanceMetadata",
        "name": "Bob!!",
        // ...
    }
    ```

  </Col>
</Row>

## Entity data

<Row>
    <Col>
        <Properties name="EntityData">
            <Property name="endpoint">
                Must be `/.versia/v0.6/entities/{entity_type}/{id}`.

                - `{entity_type}`: The type of the entity to fetch, URL-encoded.
                - `{id}`: The ID of the entity to fetch, URL-encoded.

                Example: `GET /.versia/v0.6/entities/pub.versia%3Agroups%2FGroup/1234` fetches the [Group](/extensions/groups) entity with ID `1234`.
            </Property>
            <Property name="method">
                Must be `GET`.
            </Property>
            <Property name="response">
                Entity data as JSON, as defined in its [Entity](/entities) definition document.
            </Property>
        </Properties>
    </Col>

    <Col sticky>

        ```http {{ 'title': 'Example request' }}
        GET /.versia/v0.6/entities/user/1234
        Host: b.social
        Accept: application/vnd.versia+json
        ```

        ```http {{ 'title': 'Example response' }}
        HTTP/1.1 200 OK
        Content-Type: application/vnd.versia+json; charset=utf-8

        {
            "type": "User",
            "id": "1234",
            // ...
        }
        ```
    </Col>
</Row>

## Entity collections

<Row>
    <Col>
        <Properties name="EntityCollection">
            <Property name="endpoint">
                Must be `/.versia/v0.6/entities/{entity_type}/{id}/collections/{collection_type}`.

                - `{entity_type}`: The type of the entity to fetch, URL-encoded.
                - `{id}`: The ID of the entity to fetch, URL-encoded.
                - `{collection_type}`: The type of the collection to fetch, URL-encoded.

                Example: `GET /.versia/v0.6/entities/User/1234/collections/followers` fetches the followers of the user with ID `1234`.
            </Property>
            <Property name="method">
                Must be `GET`.
            </Property>
            <Property name="response">
                Must be either a [Collection](/structures/collection) or a [URICollection](/structures/collection#uri-collection) as JSON.
            </Property>
        </Properties>
    </Col>

    <Col sticky>

        ```http {{ 'title': 'Example request' }}
        GET /.versia/v0.6/entities/user/1234/collections/followers
        Host: b.social
        Accept: application/vnd.versia+json
        ```

        ```http {{ 'title': 'Example response' }}
        HTTP/1.1 200 OK
        Content-Type: application/vnd.versia+json; charset=utf-8

        {
            "type": "Followers",
            "id": "1234",
            // ...
        }
        ```
    </Col>
</Row>

### Pagination

Collections MUST support pagination, using the following URI parameters:

- `offset`: The number of items to skip before returning the first item. This is a zero-based index.
- `limit`: The maximum number of items to return. This is a one-based index. Implementations MUST support a minimum of `1` and a maximum of `40` items.

```http {{ 'title': 'Example paginated collection request' }}
GET /.versia/v0.6/entities/user/1234/collections/followers?offset=10&limit=20
Host: b.social
Accept: application/vnd.versia+json
```

## Inbox

The inbox endpoint is used for instances to send entities to each other. It is a single endpoint that can receive messages for every user (also known as a shared inbox).

The delivery mechanism is described further in the [Federation](/federation#inboxes) document.

<Row>
    <Col>
        <Properties name="Inbox">
            <Property name="endpoint">
                Must be `/.versia/v0.6/inbox`.
            </Property>
            <Property name="method">
                Must be `POST`.
            </Property>
        </Properties>
    </Col>

    <Col sticky>

        ```http {{ 'title': 'Example request' }}
        POST /.versia/v0.6/inbox
        Host: b.social
        Accept: application/vnd.versia+json
        Content-Type: application/vnd.versia+json; charset=utf-8

        {
            "type": "Note",
            "id": "1234",
            ...
        }
        ```

    </Col>
</Row>