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rero / rero-invenio-thumbnails / 21249873776 / 1
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22 Jan 2026 01:15PM UTC coverage: 94.256% (+0.3%) from 93.931%
21249873776.1

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initial: add rero-invenio-thumbnails extension

Lightweight Invenio extension for discovering book thumbnail URLs from multiple providers.

Features:
- Multi-provider architecture with fallback chain
- 6 built-in providers: Files, OpenLibrary, BNF, DNB, GoogleBooks, GoogleAPI
- Plugin-based system via entry points for custom providers
- Redis-based caching with configurable TTL
- RESTful JSON API: GET /thumbnails-url/<isbn>
- HTTP retry logic with exponential backoff
- Comprehensive test suite: 112 tests, 97% coverage

Providers:
- FilesProvider: Serve from local filesystem directory
- OpenLibraryProvider: Community-driven book cover database
- BnfProvider: Bibliothèque nationale de France covers
- GoogleBooksProvider: Google Books preview service
- GoogleApiProvider: Official Google Books API

Architecture:
- URL discovery only (no image serving/manipulation)
- Chainable provider pattern with first-match-wins strategy
- Configurable provider order and retry behavior
- Full Sphinx documentation with API reference

Co-Authored-by: Peter Weber <peter.weber@rero.ch>

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