# Archipelago DWN Protocol Definitions

## Overview

These protocol definitions specify the data schemas used when Archipelago nodes exchange data via Decentralized Web Nodes (DWN). By defining protocols in the standard DWN format, any DWN-compatible application can read and write Archipelago data.

Each protocol defines:
- A unique URI identifier
- Data types with JSON schemas
- Structure rules (who can read/write what)

## Protocol 1: Node Identity Announcements

**URI**: `https://archipelago.dev/protocols/node-identity/v1`

Nodes publish their identity information so federated peers can discover capabilities and status.

```json
{
  "protocol": "https://archipelago.dev/protocols/node-identity/v1",
  "published": true,
  "types": {
    "announcement": {
      "schema": "https://archipelago.dev/schemas/node-announcement/v1",
      "dataFormats": ["application/json"]
    }
  },
  "structure": {
    "announcement": {
      "$actions": [
        { "who": "anyone", "can": ["read"] },
        { "who": "author", "of": "announcement", "can": ["write", "update", "delete"] }
      ]
    }
  }
}
```

**Schema**: `node-announcement/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["did", "version", "apps", "timestamp"],
  "properties": {
    "did": {
      "type": "string",
      "description": "Node's DID (did:key or did:dht)"
    },
    "version": {
      "type": "string",
      "description": "Archipelago version (semver)"
    },
    "apps": {
      "type": "array",
      "items": { "type": "string" },
      "description": "List of installed app IDs"
    },
    "capabilities": {
      "type": "array",
      "items": { "type": "string" },
      "description": "Node capabilities (e.g., 'file-sharing', 'dwn-sync', 'tor')"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp of announcement"
    }
  }
}
```

## Protocol 2: File Sharing Catalog

**URI**: `https://archipelago.dev/protocols/file-catalog/v1`

Nodes publish their shared file catalogs so peers can browse available content.

```json
{
  "protocol": "https://archipelago.dev/protocols/file-catalog/v1",
  "published": true,
  "types": {
    "entry": {
      "schema": "https://archipelago.dev/schemas/file-entry/v1",
      "dataFormats": ["application/json"]
    }
  },
  "structure": {
    "entry": {
      "$actions": [
        { "who": "anyone", "can": ["read"] },
        { "who": "author", "of": "entry", "can": ["write", "update", "delete"] }
      ]
    }
  }
}
```

**Schema**: `file-entry/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["id", "title", "access", "size_bytes", "created_at"],
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique file entry ID"
    },
    "title": {
      "type": "string",
      "description": "Display title"
    },
    "description": {
      "type": "string",
      "description": "Optional description"
    },
    "content_type": {
      "type": "string",
      "description": "MIME type (e.g., 'application/pdf')"
    },
    "size_bytes": {
      "type": "integer",
      "description": "File size in bytes"
    },
    "access": {
      "type": "string",
      "enum": ["free", "peers-only", "paid"],
      "description": "Access level"
    },
    "price_sats": {
      "type": "integer",
      "description": "Price in satoshis (for paid access)"
    },
    "hash": {
      "type": "string",
      "description": "SHA-256 hash of file content"
    },
    "created_at": {
      "type": "string",
      "format": "date-time"
    },
    "tags": {
      "type": "array",
      "items": { "type": "string" },
      "description": "Content tags for filtering"
    }
  }
}
```

## Protocol 3: Federation State

**URI**: `https://archipelago.dev/protocols/federation/v1`

Nodes publish their federation membership and peer trust status.

```json
{
  "protocol": "https://archipelago.dev/protocols/federation/v1",
  "published": false,
  "types": {
    "membership": {
      "schema": "https://archipelago.dev/schemas/federation-membership/v1",
      "dataFormats": ["application/json"]
    },
    "peerStatus": {
      "schema": "https://archipelago.dev/schemas/peer-status/v1",
      "dataFormats": ["application/json"]
    }
  },
  "structure": {
    "membership": {
      "$actions": [
        { "who": "recipient", "of": "membership", "can": ["read"] },
        { "who": "author", "of": "membership", "can": ["write", "update", "delete"] }
      ]
    },
    "peerStatus": {
      "$actions": [
        { "who": "recipient", "of": "peerStatus", "can": ["read"] },
        { "who": "author", "of": "peerStatus", "can": ["write", "update"] }
      ]
    }
  }
}
```

**Schema**: `federation-membership/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["node_did", "trust_level", "joined_at"],
  "properties": {
    "node_did": {
      "type": "string",
      "description": "DID of the federated node"
    },
    "trust_level": {
      "type": "string",
      "enum": ["trusted", "verified", "untrusted"],
      "description": "Trust level assigned to this peer"
    },
    "joined_at": {
      "type": "string",
      "format": "date-time"
    },
    "last_seen": {
      "type": "string",
      "format": "date-time"
    },
    "apps": {
      "type": "array",
      "items": { "type": "string" },
      "description": "Apps reported by this peer"
    },
    "credential_id": {
      "type": "string",
      "description": "VC ID proving federation relationship"
    }
  }
}
```

**Schema**: `peer-status/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["node_did", "online", "timestamp"],
  "properties": {
    "node_did": {
      "type": "string"
    },
    "online": {
      "type": "boolean"
    },
    "cpu_percent": {
      "type": "number"
    },
    "memory_used_mb": {
      "type": "integer"
    },
    "disk_used_percent": {
      "type": "number"
    },
    "container_count": {
      "type": "integer"
    },
    "uptime_seconds": {
      "type": "integer"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time"
    }
  }
}
```

## Protocol 4: App Deployment Requests

**URI**: `https://archipelago.dev/protocols/app-deploy/v1`

Enables trusted peers to request app installations on remote nodes.

```json
{
  "protocol": "https://archipelago.dev/protocols/app-deploy/v1",
  "published": false,
  "types": {
    "request": {
      "schema": "https://archipelago.dev/schemas/deploy-request/v1",
      "dataFormats": ["application/json"]
    },
    "response": {
      "schema": "https://archipelago.dev/schemas/deploy-response/v1",
      "dataFormats": ["application/json"]
    }
  },
  "structure": {
    "request": {
      "$actions": [
        { "who": "recipient", "of": "request", "can": ["read"] },
        { "who": "author", "of": "request", "can": ["write"] }
      ],
      "response": {
        "$actions": [
          { "who": "author", "of": "request", "can": ["read"] },
          { "who": "recipient", "of": "request", "can": ["write"] }
        ]
      }
    }
  }
}
```

**Schema**: `deploy-request/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["app_id", "requester_did", "target_did", "action"],
  "properties": {
    "app_id": {
      "type": "string",
      "description": "Application identifier (e.g., 'bitcoin-knots')"
    },
    "requester_did": {
      "type": "string",
      "description": "DID of the requesting node"
    },
    "target_did": {
      "type": "string",
      "description": "DID of the target node"
    },
    "action": {
      "type": "string",
      "enum": ["install", "update", "uninstall"],
      "description": "Deployment action"
    },
    "image": {
      "type": "string",
      "description": "Docker/OCI image reference"
    },
    "version": {
      "type": "string",
      "description": "Requested version"
    },
    "reason": {
      "type": "string",
      "description": "Human-readable reason for request"
    },
    "requested_at": {
      "type": "string",
      "format": "date-time"
    }
  }
}
```

**Schema**: `deploy-response/v1`

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["request_id", "status"],
  "properties": {
    "request_id": {
      "type": "string",
      "description": "ID of the original request"
    },
    "status": {
      "type": "string",
      "enum": ["accepted", "rejected", "completed", "failed"],
      "description": "Response status"
    },
    "reason": {
      "type": "string",
      "description": "Reason for rejection or failure"
    },
    "completed_at": {
      "type": "string",
      "format": "date-time"
    }
  }
}
```

## Registration

On backend startup, all 4 protocols should be auto-registered via `dwn.register-protocol`:

```rust
const ARCHIPELAGO_PROTOCOLS: &[&str] = &[
    "https://archipelago.dev/protocols/node-identity/v1",
    "https://archipelago.dev/protocols/file-catalog/v1",
    "https://archipelago.dev/protocols/federation/v1",
    "https://archipelago.dev/protocols/app-deploy/v1",
];
```

## Interoperability

These protocols follow the DWN protocol definition format. Any application that implements DWN can:

1. **Read** node announcements to discover Archipelago nodes
2. **Browse** file catalogs to find shared content
3. **Query** federation state to understand network topology
4. **Request** app deployments through the standard DWN messaging interface

The `published: true` flag on protocols 1 and 2 means any DWN node can query for these records. Protocols 3 and 4 are `published: false` (private — only shared with authorized peers).