ReadMeABook/documentation/integrations/audible.md

Audible Integration

Status: ✅ Implemented (Audnexus API + Web Scraping)

Audiobook metadata from Audnexus API (primary) and Audible.com scraping (fallback) for discovery, search, and detail pages.

Detail Page Strategy

Primary: Audnexus API

• Endpoint: https://api.audnex.us/books/{asin}
• Structured JSON response (no parsing needed)
• Provides: title, authors, narrators, description, duration, rating, genres, cover art
• Free, no API key required
• ~95% success rate for popular audiobooks

Fallback: Audible Scraping

• Used when Audnexus returns 404
• Parse Audible HTML with Cheerio
• Multiple selector strategies with promotional text filtering
• Extract JSON-LD structured data when available

Region Configuration

Status: ✅ Implemented

Configurable Audible region for accurate metadata matching across different international Audible stores.

Supported Regions:

• United States (us) - audible.com (default, English)
• Canada (ca) - audible.ca (English)
• United Kingdom (uk) - audible.co.uk (English)
• Australia (au) - audible.com.au (English)
• India (in) - audible.in (English)
• Germany (de) - audible.de (non-English)
• Spain (es) - audible.es (non-English)

isEnglish Flag:

• Each region has isEnglish: boolean in AudibleRegionConfig
• Non-English regions (isEnglish: false) display an amber warning in all region dropdowns (setup wizard + admin settings)
• Warning text: "Many features such as search, discovery, and metadata matching are not yet fully supported for non-English regions."
• Dropdown options for non-English regions show * suffix (e.g., "Germany *")

Why Regions Matter:

• Each Audible region uses different ASINs for the same audiobook
• Metadata engines (Audnexus/Audible Agent) in Plex/Audiobookshelf must match RMAB's region
• Mismatched regions cause poor search results and failed metadata matching

Configuration:

• Key: audible.region (stored in database)
• Default: us
• Set during: Setup wizard (Backend Selection step) or Admin Settings (Library tab)
• Help text instructs users to match their metadata engine region

Implementation:

• AudibleService loads region from config on initialization
• Dynamically builds base URL: AUDIBLE_REGIONS[region].baseUrl
• Audnexus API calls include region parameter: ?region={code}
• IP redirect prevention: ?ipRedirectOverride=true on all Audible requests (region only)
• Locale enforcement: ?language=english query parameter on all Audible requests (forces English content regardless of server IP geolocation)
• Configuration service helper: getAudibleRegion() returns configured region
• Auto-detection of region changes: Service checks config before each request and re-initializes if region changed
• Cache clearing: When region changes, ConfigService cache and AudibleService initialization are cleared
• Automatic refresh: Changing region automatically triggers audible_refresh job to fetch new data

Files:

• Types: src/lib/types/audible.ts
• Service: src/lib/integrations/audible.service.ts
• Config: src/lib/services/config.service.ts
• API: src/app/api/admin/settings/audible/route.ts

Discovery Strategy (Popular/New/Search)

• Parse Audible HTML with Cheerio
• Multi-page scraping (20 items/page)
• Rate limit: max 10 req/min, 1.5s delay between pages
• Cache results in database (24hr TTL)

Data Sources

URLs dynamically built based on configured region:

1. Best Sellers: {baseUrl}/adblbestsellers
2. New Releases: {baseUrl}/newreleases
3. Search: {baseUrl}/search?keywords={query}&ipRedirectOverride=true
4. Detail Page: {baseUrl}/pd/{asin}?ipRedirectOverride=true
5. Audnexus API: https://api.audnex.us/books/{asin}?region={code}

Where {baseUrl} is determined by configured region (e.g., https://www.audible.co.uk for UK).

Metadata Extracted

• ASIN (Audible ID)
• Title, author, narrator
• Duration (minutes), release date, rating
• Description, cover art URL
• Genres/categories

Unified Matching (audiobook-matcher.ts)

Status: ✅ Production Ready (ASIN-Only Matching)

Single matching algorithm used everywhere (search, popular, new-releases, jobs).

Process (Library Availability Checks):

1. Query DB directly by ASIN (indexed O(1) lookup)
2. Check ASIN in dedicated field (100% confidence)
3. Check ASIN in plexGuid (backward compatibility)
4. Return match or null (no fuzzy fallback)

Match Priority:

• findPlexMatch(): ASIN (field) → ASIN (GUID) → null
• matchAudiobook(): ASIN → ISBN → null

Benefits:

• Real-time matching at query time (not pre-matched)
• 100% confidence matches only (eliminates false positives)
• O(1) indexed lookups (faster than fuzzy matching)
• Solves race condition with Audiobookshelf ASIN population
• Used by all APIs for consistency

Note: Fuzzy matching (70% threshold) is preserved in ranking-algorithm.ts for Prowlarr torrent ranking, where it's needed to score multiple release candidates. Library availability checks require exact ASIN matches only.

Database-First Approach

Status: ✅ Implemented

Discovery APIs serve cached data from DB with real-time matching.

Flow:

1. audible_refresh job runs daily → fetches 200 popular + 200 new releases
2. Downloads and caches cover thumbnails locally (reduces Audible load)
3. Stores in DB with flags (isPopular, isNewRelease) and rankings
4. Cleans up unused thumbnails after sync
5. API routes query DB → apply real-time matching → return enriched results
6. Homepage loads instantly (no Audible API hits)

Thumbnail Caching

Status: ✅ Implemented

Cover images cached locally to reduce external requests and improve performance.

Features:

• Downloads covers during audible_refresh job
• Stores in /app/cache/thumbnails (Docker volume)
• Serves via /api/cache/thumbnails/[filename]
• Auto-cleanup of unused thumbnails
• Falls back to original URL if cache fails
• 24-hour browser cache headers

Implementation:

• Service: src/lib/services/thumbnail-cache.service.ts
• API Route: src/app/api/cache/thumbnails/[filename]/route.ts
• Storage: Docker volume cache mounted at /app/cache
• Filename: {asin}.{ext} (e.g., B08G9PRS1K.jpg)

API Endpoints:

GET /api/audiobooks/popular?page=1&limit=20 GET /api/audiobooks/new-releases?page=1&limit=20

Response:

{
  success: boolean;
  audiobooks: EnrichedAudibleAudiobook[];
  count: number;
  totalCount: number;
  page: number;
  totalPages: number;
  hasMore: boolean;
  lastSync: string | null; // ISO timestamp
  message?: string; // if no data
}

Data Models

interface AudibleAudiobook {
  asin: string;
  title: string;
  author: string;
  narrator?: string;
  description?: string;
  coverArtUrl?: string;
  durationMinutes?: number;
  releaseDate?: string;
  rating?: number;
  genres?: string[];
}

interface EnrichedAudibleAudiobook extends AudibleAudiobook {
  availabilityStatus: 'available' | 'requested' | 'unknown';
  isAvailable: boolean;
  plexGuid: string | null;
  dbId: string;
}

Tech Stack

• axios (HTTP)
• cheerio (HTML parsing)
• Redis (caching, optional)
• Database (PostgreSQL)
• string-similarity (matching)

Fixed Issues

Search returning empty results (2026-01-07)

• Problem: Audible changed HTML structure for search results from .productListItem to .s-result-item
• Impact: All search queries returned 0 results
• Fix: Updated search() method to support both .s-result-item (current) and .productListItem (legacy)
• Selectors updated:
  • Main: .s-result-item, .productListItem
  • Title: h2 (new) or h3 a (legacy)
  • Author: a[href*="/author/"] (new) or .authorLabel (legacy)
  • Narrator: a[href*="searchNarrator="] (new) or .narratorLabel (legacy)
  • Runtime: span:contains("Length:") (new) or .runtimeLabel (legacy)
  • Rating: .a-icon-star span (new) or .ratingsLabel (legacy)
• Location: src/lib/integrations/audible.service.ts:235

Some audiobooks missing from search results (2026-01-07)

• Problem: ASIN extraction only matched /pd/ URLs but some audiobooks use /ac/ URLs
• Impact: Books like "Beatitude" by DJ Krimmer (ASIN: B0DVH7XL36) were skipped
• Fix: Updated ASIN regex to match both /pd/ and /ac/ URL patterns: /\/(?:pd|ac)\/[^\/]+\/([A-Z0-9]{10})/
• Location: src/lib/integrations/audible.service.ts:75, 161, 240
• Affects: getPopularAudiobooks(), getNewReleases(), search() methods

Audiobookshelf metadata matching not respecting configured region (2026-01-28)

• Problem: triggerABSItemMatch() hardcoded 'audible' provider (audible.com) instead of respecting user's configured Audible region
• Impact: Users with non-US regions (CA, UK, AU, IN) had incorrect metadata matching in Audiobookshelf, causing wrong ASINs and poor search results
• Fix: Added mapRegionToABSProvider() to convert RMAB region codes to AudiobookShelf provider values. US → 'audible', others → 'audible.{region}' (e.g., 'audible.ca', 'audible.uk')
• Location: src/lib/services/audiobookshelf/api.ts:14, 147
• Affects: All Audiobookshelf metadata matching operations

Non-English locale pages served to users outside US (2026-02-05)

• Problem: Audible uses IP geolocation to serve locale-specific pages (e.g., Spanish content for Dominican Republic IPs). ipRedirectOverride=true only prevents region redirects (audible.com → audible.co.uk), NOT language/locale changes.
• Impact: Users self-hosting from non-English-speaking countries got non-English bestsellers/new releases on their homepage.
• Fix: Added language=english query parameter to all Audible requests via axios default params. Audible respects this parameter and serves English content regardless of IP geolocation. Fails gracefully for regions where English isn't available.
• Location: src/lib/integrations/audible.service.ts — initialize() (axios default params)
• Affects: All Audible scraping: popular, new releases, search, detail pages