export const metadata = {
    title: 'Delegation Extension',
    description: 'Lets users perform actions on other accounts\' behalf.'
}

# Delegation Extension

Delegation is used to authorize actions on behalf of another user. {{ className: 'lead '}}

## Vocabulary

- **Delegator**: The user that is delegating actions to another user. (The user that owns the key)
- **Delegate**: The user that is being delegated actions. (The user that the key is pointing to)

## Implementation Details

Any actions or entities created by the **delegate** should be attributed to the **delegator** user in clients transparently to end-users (e.g. showing the **delegator** user's name and avatar). This allows for a form of "consensual impersonation" that is authorized by the **delegators** and **delegates**.

This is useful as a way to centralize all of a user's many "alt accounts" into a single, unified feed.

<Warning>
    If an instance encounters an action from a User that has a Delegator listed, but that Delegator does not allow the User to perform actions on their behalf, the actions **MUST** be shown as the User's own.

    Also, if a User has a Delegator listed, but that Delegator does not allow the User to perform actions on their behalf, instances **SHOULD** mark the User with a warning about possible impersonation or fraud.
</Warning>

## Extension Definition

<Row>
    <Col>
        <Properties name="Delegation">
            The Delegation extension uses an ID of `pub.versia:delegation`.

            If the extension is present, exactly **one** of the fields **MUST** be specified:

            <Property name="delegator" type="Reference">
                If this user performs actions on behalf on another user, **MUST** have a reference to that user.
            </Property>
            <Property name="allowed_delegates" type="Reference[]">
                If other users perform actions on behalf of this user, **MUST** have a list of references to all such users.
            </Property>
        </Properties>
    </Col>

    <Col sticky>

    ```jsonc {{ title: "Example Delegator" }}
    {
        // ...
        "type": "User",
        "id": "73cb1728-75d7-4080-8d28-4adf49bb0a0d",
        // ...
        "extensions": { // [!code focus:5]
            "pub.versia:delegation": {
                "delegator": "versia.example.com:bfb6bb39-bb08-4226-91ac-8adebc3da046"
            }
        }
    }
    ```

    ```jsonc {{ title: "Example Delegates List" }}
    {
        // ...
        "type": "User",
        "id": "bfb6bb39-bb08-4226-91ac-8adebc3da046",
        // ...
        "extensions": { // [!code focus:7]
            "pub.versia:delegation": {
                "allowed_delegates": [
                    "versia.social:73cb1728-75d7-4080-8d28-4adf49bb0a0d"
                ]
            }
        }
    }
    ```

    </Col>
</Row>
