bookhoard/bruno/koreader

KOReader Integration

Overview

Bookhoard provides full Calibre-compatible wireless sync for KOReader devices, enabling seamless reading progress, highlights, and notes synchronization.

Setup

1. Register Your Device

First, register your KOReader device with Bookhoard:

POST /api/devices/register
{
  "device_name": "My Kindle Paperwhite",
  "device_type": "koreader",
  "device_identifier": "unique-hardware-id"
}

You'll receive:

• A registration URL to approve the device
• A QR code for easy setup
• Setup instructions for your device type

2. Approve Device

Visit the approval URL in your web browser (or scan the QR code) to authenticate the device.

3. Configure KOReader

In KOReader settings, set:

• Calibre wireless URL: https://your-bookhoard-domain.com/api/sync/koreader
• Enable wireless sync: ON
• Sync frequency: Every page turn (recommended)

4. Enter Device Token

After approval, you'll receive a device token. Add this to KOReader:

• Settings → Wireless sync → Password
• Paste the token: dev_xxxxx...

API Endpoints

Sync Progress

Updates reading progress for one or more books.

POST /api/sync/koreader/progress
Authorization: Bearer {device_token}
Content-Type: application/json

{
  "books": [
    {
      "uuid": "book-uuid",
      "title": "Book Title",
      "authors": ["Author Name"],
      "percentage": 0.45,
      "progress": 0.45,
      "chapter": 5,
      "character": 15432,
      "epubcfi": "epubcfi(/6/4/2:15)",
      "page": 89,
      "total_pages": 200,
      "last_read": "2026-01-30T20:00:00Z"
    }
  ],
  "sync_mode": "immediate"
}

Response (202 Accepted):

{
  "sync_status": "accepted",
  "books_synced": 1,
  "conflicts": [],
  "timestamp": "2026-01-30T20:00:00Z",
  "device_updated": true
}

Get Book Metadata

Fetches progress and annotations for a specific book.

GET /api/sync/koreader/metadata/{book_uuid}
Authorization: Bearer {device_token}

Response (200 OK):

{
  "uuid": "book-uuid",
  "title": "Book Title",
  "authors": ["Author Name"],
  "progress": {
    "percentage": 0.45,
    "chapter": 5,
    "epubcfi": "epubcfi(/6/4/2:15)",
    "character": 15432,
    "page": 89,
    "total_pages": 200
  },
  "annotations": {
    "highlights": [
      {
        "text": "highlighted text",
        "pos0": "epubcfi(/6/4/2:15)",
        "pos1": "epubcfi(/6/4/2:20)",
        "color": "#ffff00",
        "datetime": "2026-01-30T19:55:00Z"
      }
    ],
    "notes": [
      {
        "text": "My note",
        "pos0": "epubcfi(/6/4/2:15)",
        "datetime": "2026-01-30T19:55:00Z"
      }
    ]
  },
  "last_sync": "2026-01-30T20:00:00Z"
}

Get Library

Fetches all books available for sync.

GET /api/sync/koreader/library
Authorization: Bearer {device_token}

Response (200 OK):

{
  "library_sync": [
    {
      "uuid": "book-uuid",
      "title": "Book Title",
      "author": "Author Name",
      "content_type": "6",
      "percent_read": 45.0,
      "pages_remaining": 115,
      "bookmark_count": 3,
      "last_modified": "2026-01-30T20:00:00Z"
    }
  ],
  "total_books": 10,
  "last_sync": "2026-01-30T20:00:00Z"
}

Sync Bookmarks/Notes/Highlights

Syncs annotations for a specific book.

POST /api/sync/koreader/bookmarks
Authorization: Bearer {device_token}
Content-Type: application/json

{
  "book_uuid": "book-uuid",
  "bookmarks": [
    {
      "chapter": 3,
      "datetime": "2026-01-30T19:55:00Z",
      "pos0": "epubcfi(/6/4/2:15)",
      "page": 45,
      "text": "Bookmarked text",
      "type": "bookmark"
    }
  ],
  "highlights": [
    {
      "chapter": 3,
      "datetime": "2026-01-30T19:55:00Z",
      "pos0": "epubcfi(/6/4/2:15)",
      "pos1": "epubcfi(/6/4/2:20)",
      "page": 45,
      "text": "highlighted text",
      "color": "#ffff00"
    }
  ],
  "notes": [
    {
      "chapter": 3,
      "datetime": "2026-01-30T19:55:00Z",
      "pos0": "epubcfi(/6/4/2:15)",
      "notes": "My note content",
      "page": 45
    }
  ]
}

Response (200 OK):

{
  "sync_status": "completed",
  "bookmarks_synced": 1,
  "notes_synced": 1,
  "highlights_synced": 1,
  "total_synced": 3,
  "timestamp": "2026-01-30T20:00:00Z"
}

Sync Modes

Immediate Mode (Recommended)

Syncs on every page turn for real-time updates across all devices.

{ "sync_mode": "immediate" }

Checkpoint Mode

Syncs periodically to save bandwidth.

{
  "sync_mode": "checkpoint",
  "checkpoint_id": "checkpoint-uuid",
  "since_timestamp": "2026-01-30T19:00:00Z"
}

Rate Limits

• Sync requests: 60/minute
• Progress updates: 120/minute
• Metadata requests: 30/minute

Device Matching

Bookhoard tries multiple strategies to match books:

1. By UUID: Most reliable if your book files have unique IDs (confidence: 1.0)
2. By SHA-256: Hash-based matching for reliable identification (confidence: 0.9)
3. By file path: Matches exact file path and creates device alias (confidence: 0.7)
4. By title + author: Fallback for unmatched books (confidence: 0.5)
5. By title only: Last resort match (confidence: 0.4)

SHA-256 Matching (Phase 7 Enhancement)

Bookhoard now supports SHA-256 hash matching for reliable book identification:

{
  "books": [
    {
      "sha256": "a1b2c3d4e5f6...",
      "file_path": "/mnt/onboard/Book.epub",
      "percentage": 0.65,
      "page": 142,
      "total_pages": 310
    }
  ]
}

Benefits:

• Works even if file path changes
• Reliable across device re-formats
• Automatic device file alias creation
• Per-annotation SHA-256 support for mixed-book syncs

Device File Alias System

When a book is matched with a file path, Bookhoard automatically creates a device file alias:

• UUID + FilePath: Creates alias with confidence 1.0
• SHA-256 + FilePath: Creates alias with confidence 0.9
• FilePath only: Creates alias with confidence 0.7
• Title match + FilePath: Creates alias with confidence 0.5-0.7

Once created, aliases enable future syncs without UUID or SHA-256:

{
  "books": [
    {
      "file_path": "/mnt/onboard/Book.epub",
      "percentage": 0.70
    }
  ]
}

Per-Annotation SHA-256

Sync bookmarks/notes/highlights for multiple books in one request:

{
  "highlights": [
    {
      "text": "Quote from book 1",
      "pos0": "/6/4[chap1]!/4/2/1:0",
      "pos1": "/6/4[chap1]!/4/2/1:50",
      "color": "#ffff00",
      "book_sha256": "abc123..."
    },
    {
      "text": "Quote from book 2",
      "pos0": "/6/4[chap1]!/4/2/1:0",
      "pos1": "/6/4[chap1]!/4/2/1:50",
      "color": "#00ff00",
      "book_sha256": "def456..."
    }
  ]
}

Conflict Resolution

When the same book is read on multiple devices within 5 minutes:

• Auto-resolution uses "most recent progress wins"
• Conflicts are logged for review
• Users can manually resolve conflicts via the web UI

Troubleshooting

Sync Not Working

1. Check device token: Ensure token is valid and not revoked
2. Verify sync enabled: Device must have sync_enabled: true
3. Check rate limits: Device may be rate-limited
4. Book matching: Ensure books can be matched by UUID, path, or title

Progress Not Updating

1. Verify percentage value: Must be between 0.0 and 1.0
2. Check book ownership: User must have access to the book
3. Review sync logs: Check for error messages

Authentication Errors

1. Token expired: Re-register device
2. Device revoked: Check device status in web UI
3. Invalid token format: Ensure Bearer dev_xxxxx... format

Testing

Use the Bruno API collection in /bruno/koreader/ to test endpoints:

• Sync Progress.bru - Test progress sync
• Get Book Metadata.bru - Test metadata retrieval
• Get Library.bru - Test library sync
• Sync Bookmarks.bru - Test annotation sync

Required variables:

• baseUrl - Your Bookhoard server URL
• device_token - Device authentication token
• book_uuid - UUID of a test book

Implementation Notes

• Compatible with Calibre wireless protocol
• Supports EPUB CFI for precise locations
• Handles reflowable and fixed-layout formats
• Bidirectional sync (KOReader ↔ Bookhoard)
• Real-time updates via WebSocket (coming in Phase 3b)

Next Steps

See Phase 3 implementation guide for:

• WebSocket real-time sync
• Advanced conflict resolution
• Offline sync queue management
• Performance optimization