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remoteStorage protocol support by melvincarvalho · Pull Request #162 · JavaScriptSolidServer/JavaScriptSolidServer · GitHub

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remoteStorage protocol support #162

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melvincarvalho merged 7 commits into from
Mar 10, 2026
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remoteStorage protocol support #162

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338f0ae
Add remoteStorage protocol support
melvincarvalho Mar 10, 2026
f5e1fcc
Fix Copilot review: harden remoteStorage security and consistency
melvincarvalho Mar 10, 2026
aff948a
Add Mastodon API, OAuth 2.0, and remoteStorage docs to README
melvincarvalho Mar 10, 2026
7548004
Bump version to 0.0.97
melvincarvalho Mar 10, 2026
e704adc
Wire remoteStorage username to singleUserName, not apUsername
melvincarvalho Mar 10, 2026
33e069b
Remove unused BLOCKED_NAMES constant
melvincarvalho Mar 10, 2026
a289965
Update docs: RS requires --activitypub for discovery and OAuth
melvincarvalho Mar 10, 2026
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108 changes: 107 additions & 1 deletion README.md
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Expand Up @@ -18,6 +18,9 @@ A minimal, fast, JSON-LD native Solid server.
- **HTTP Range Requests** - Partial content delivery for large files and media streaming
- **Single-User Mode** - Simplified setup for personal pod servers
- **ActivityPub Federation** - Fediverse integration with WebFinger, inbox/outbox, HTTP signatures
- **Mastodon-compatible API** - Dynamic client registration, instance info, account verification
- **OAuth 2.0 Authorization** - Shared auth flow for Mastodon clients, remoteStorage apps, and third-party panes
- **remoteStorage Protocol** - [draft-dejong-remotestorage-22](https://remotestorage.io/spec/) file sync (requires `--activitypub` for WebFinger discovery + OAuth)
- **LDP CRUD Operations** - GET, PUT, POST, DELETE, HEAD
- **N3 Patch** - Solid's native patch format for RDF updates
- **SPARQL Update** - Standard SPARQL UPDATE protocol for PATCH
Expand Down Expand Up @@ -554,6 +557,106 @@ curl -H "Accept: application/activity+json" http://localhost:3000/profile/card
curl http://localhost:3000/.well-known/nodeinfo/2.1
```

## Mastodon-compatible API

JSS exposes Mastodon API endpoints so that Mastodon clients (Elk, Phanpy, Ice Cubes) can connect:

```bash
jss start --activitypub --idp
```

### Endpoints

| Endpoint | Description |
|----------|-------------|
| `POST /api/v1/apps` | Dynamic client registration |
| `GET /api/v1/accounts/verify_credentials` | Current user profile |
| `GET /api/v1/instance` | Instance metadata |
| `GET /oauth/authorize` | OAuth authorize page |
| `POST /oauth/authorize` | Process login |
| `POST /oauth/token` | Exchange code for Bearer token |

### OAuth 2.0 Flow

The OAuth layer is shared between Mastodon clients, remoteStorage apps, and third-party Solid panes:

1. Client registers via `POST /api/v1/apps` (gets `client_id` + `client_secret`)
2. Client redirects user to `GET /oauth/authorize?client_id=...&redirect_uri=...&response_type=code`
3. User logs in, JSS redirects back with `?code=...`
4. Client exchanges code for Bearer token via `POST /oauth/token`
5. Bearer token works with all JSS endpoints (Solid, ActivityPub, remoteStorage)

Supports out-of-band (OOB) redirect for CLI/desktop clients.

### Testing

```bash
# Register a client
curl -X POST http://localhost:3000/api/v1/apps \
-H "Content-Type: application/json" \
-d '{"client_name": "Test App", "redirect_uris": "urn:ietf:wg:oauth:2.0:oob"}'

# Check instance info
curl http://localhost:3000/api/v1/instance
```

## remoteStorage

JSS implements the [remoteStorage protocol](https://remotestorage.io/spec/draft-dejong-remotestorage-22). The storage routes are always available, but WebFinger discovery and OAuth require `--activitypub` (which provides the WebFinger and OAuth endpoints). Any remoteStorage-compatible app can store and sync data on your pod.

```bash
jss start --activitypub --idp
```

### Discovery

remoteStorage clients discover the storage endpoint via WebFinger:

```bash
curl "http://localhost:3000/.well-known/webfinger?resource=acct:me@localhost:3000"
```

The response includes a `remotestorage` link relation pointing to `/storage/me/`.

### Endpoints

| Method | Endpoint | Description |
|--------|----------|-------------|
| `GET` | `/storage/:user/*` | Read file or list folder (JSON-LD) |
| `HEAD` | `/storage/:user/*` | Get metadata (ETag, Content-Type, size) |
| `PUT` | `/storage/:user/*` | Write file (creates parent folders) |
| `DELETE` | `/storage/:user/*` | Delete file |

### How It Works

- **Auth**: Bearer token via OAuth 2.0 (same flow as Mastodon clients)
- **Public folder**: `/storage/me/public/*` is readable without auth
- **Conditional requests**: If-Match, If-None-Match (uses shared ETag utilities)
- **Dotfile protection**: `.acl`, `.meta`, and other dotfiles are blocked
- **Read-only mode**: Respects `--read-only` flag
- **Streaming**: Large files are streamed, not buffered

### Testing

```bash
# Write a file (needs Bearer token from OAuth flow)
curl -X PUT http://localhost:3000/storage/me/documents/hello.txt \
-H "Authorization: Bearer YOUR_TOKEN" \
-H "Content-Type: text/plain" \
-d "Hello, remoteStorage!"

# Read it back
curl -H "Authorization: Bearer YOUR_TOKEN" \
http://localhost:3000/storage/me/documents/hello.txt

# List a folder
curl -H "Authorization: Bearer YOUR_TOKEN" \
http://localhost:3000/storage/me/documents/

# Read from public folder (no auth needed)
curl http://localhost:3000/storage/me/public/readme.txt
```

### Linking Nostr to WebID (did:nostr)

Bridge your Nostr identity to a Solid WebID for seamless authentication:
Expand Down Expand Up @@ -1097,7 +1200,10 @@ src/
│ ├── actor.js # Actor JSON-LD
│ ├── inbox.js # Receive activities
│ ├── outbox.js # User's activities
│ └── collections.js # Followers/following
│ ├── collections.js # Followers/following
│ ├── mastodon.js # Mastodon API (apps, instance, verify_credentials)
│ └── oauth.js # OAuth 2.0 authorize/token flow
├── remotestorage.js # remoteStorage protocol (draft-dejong-remotestorage-22)
├── rdf/
│ ├── turtle.js # Turtle <-> JSON-LD
│ └── conneg.js # Content negotiation
Expand Down
2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
{
"name": "javascript-solid-server",
"version": "0.0.96",
"version": "0.0.97",
"description": "A minimal, fast Solid server",
"main": "src/index.js",
"type": "module",
Expand Down
13 changes: 12 additions & 1 deletion src/ap/index.js
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Expand Up @@ -108,6 +108,17 @@ export async function activityPubPlugin(fastify, options = {}) {
{ profileUrl }
)

// Add remoteStorage link relation
response.links.push({
rel: 'http://tools.ietf.org/id/draft-dejong-remotestorage',
href: `${baseUrl}/storage/${config.username}/`,
properties: {
Comment on lines +111 to +115

Copilot AI Mar 10, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The WebFinger response advertises storage at /storage/${config.username} regardless of the acct: username requested. This prevents multi-user discovery and can mislead clients if the requested acct doesn't match config.username. Consider using the parsed WebFinger username in the storage href (and ensuring the storage routes validate/authorize that user appropriately).

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Comment on lines +113 to +115

Copilot AI Mar 10, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The advertised remoteStorage href does not include a trailing slash, while storage routes are defined as /storage/:user/* (which may not match /storage/:user without /). To avoid clients hitting a 404 when dereferencing the advertised URL, either advertise /storage/:user/ or add a handler/redirect for /storage/:user.

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'http://remotestorage.io/spec/version': 'draft-dejong-remotestorage-22',
'http://tools.ietf.org/html/rfc6749#section-4.2': `${baseUrl}/oauth/authorize`,
'http://tools.ietf.org/html/rfc6750#section-2.3': 'Bearer'
}
})
Comment on lines +111 to +120

Copilot AI Mar 10, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The remoteStorage discovery link is added inside activityPubPlugin’s WebFinger handler. Since activitypub is disabled by default (and /oauth/* is also registered only in this plugin), remoteStorage clients won’t be able to discover the storage endpoint or complete the OAuth flow unless ActivityPub is enabled—contradicting the PR/README claim that remoteStorage is “always on, no flag needed”. Consider moving the WebFinger + OAuth pieces to an always-on plugin, or update the docs/description to reflect the --activitypub requirement.

Copilot uses AI. Check for mistakes.

return reply
.header('Content-Type', 'application/jrd+json')
.header('Access-Control-Allow-Origin', '*')
Expand Down Expand Up @@ -137,7 +148,7 @@ export async function activityPubPlugin(fastify, options = {}) {
version: '2.1',
software: {
name: 'jss',
version: '0.0.67',
version: '0.0.97',
repository: 'https://github.com/JavaScriptSolidServer/JavaScriptSolidServer'
},
protocols: ['activitypub', 'solid'],
Expand Down
2 changes: 1 addition & 1 deletion src/ap/routes/mastodon.js
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Expand Up @@ -115,7 +115,7 @@ export function createInstanceHandler (config) {
title: config.displayName || 'JSS',
description: 'SAND Stack: Solid + ActivityPub + Nostr + DID',
short_description: 'Solid pod with Mastodon-compatible API',
version: '4.0.0 (compatible; JSS 0.0.67)',
version: '4.0.0 (compatible; JSS 0.0.97)',
urls: {
streaming_api: `${wsProtocol}://${host}`
},
Expand Down
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