Move Delegation to an extension

app/changelog/page.mdx

@@ -12,6 +12,7 @@ This page lists changes since Working Draft 3. {{ className: 'lead' }}
 
 - Added a new `content-type` for Versia entities: `application/vnd.versia+json`.
 - Removed per-User keypairs: now, only the instance keypair is used for signing.
+- Moved [Delegation](/extensions/delegation) to an extension
 - Modified how URIs and references to other entities are handled:
     - The `uri` field has been removed from all entities.
     - Every field that used to be a URI now uses that entity's `id` field.

app/extensions/delegation/page.mdx

@@ -0,0 +1,78 @@
+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>

components/Navigation.tsx

@@ -267,7 +267,6 @@ export const navigation: NavGroup[] = [
             { title: "HTTP", href: "/federation/http" },
             { title: "Validation", href: "/federation/validation" },
             { title: "Discovery", href: "/federation/discovery" },
-            { title: "Delegation", href: "/federation/delegation" },
             { title: "Example", href: "/federation/example" },
         ],
     },
@@ -295,6 +294,7 @@ export const navigation: NavGroup[] = [
         title: "Extensions",
         links: [
             { title: "Custom Emojis", href: "/extensions/custom-emojis" },
+            { title: "Delegation", href: "/extensions/delegation" },
             { title: "Groups", href: "/extensions/groups" },
             {
                 title: "Instance Messaging",

components/mdx.tsx

@@ -44,6 +44,37 @@ function InfoIcon(props: ComponentPropsWithoutRef<"svg">) {
     );
 }
 
+function WarningIcon(props: ComponentPropsWithoutRef<"svg">) {
+    return (
+        <svg viewBox="0 0 24 24" aria-hidden="true" {...props}>
+            <path
+                fill="none"
+                stroke="currentColor"
+                strokeWidth={1.5}
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3"
+            />
+            <path
+                fill="none"
+                stroke="currentColor"
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth="1.5"
+                d="M12 9v4"
+            />
+            <path
+                fill="none"
+                stroke="currentColor"
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth="2"
+                d="M12 17h.01"
+            />
+        </svg>
+    );
+}
+
 export function Note({ children }: { children: ReactNode }) {
     return (
         <div className="my-6 flex gap-2.5 rounded-md border border-brand-500/20 bg-brand-50/50 p-4 leading-6 text-brand-900 dark:border-brand-500/30 dark:bg-brand-500/5 dark:text-brand-200 dark:[--tw-prose-links-hover:theme(colors.brand.300)] dark:[--tw-prose-links:theme(colors.white)]">
@@ -55,6 +86,17 @@ export function Note({ children }: { children: ReactNode }) {
     );
 }
 
+export function Warning({ children }: { children: ReactNode }) {
+    return (
+        <div className="my-6 flex gap-2.5 rounded-md border border-yellow-500/20 bg-yellow-50/50 p-4 leading-6 text-yellow-900 dark:border-yellow-500/30 dark:bg-yellow-500/5 dark:text-yellow-200 dark:[--tw-prose-links-hover:theme(colors.yellow.300)] dark:[--tw-prose-links:theme(colors.white)]">
+            <WarningIcon className="mt-1 h-4 w-4 flex-none fill-yellow-500 stroke-white dark:fill-yellow-200/20 dark:stroke-yellow-200" />
+            <div className="[&>:first-child]:mt-0 [&>:last-child]:mb-0">
+                {children}
+            </div>
+        </div>
+    );
+}
+
 export function Row({ children }: { children: ReactNode }) {
     return (
         <div className="grid grid-cols-1 items-start gap-x-16 gap-y-10 xl:max-w-none xl:grid-cols-2">