Drupal 9 Geocoder with OSM Nominatim

Typically, we used Drupal Cloud Console's Google Maps Geocoding API for Geolocation search, but a customer asked us to use OSM Nominatim instead.

I first had to find out, how to enable this provider in Drupal's Geocoder Module for Drupal 9 but finally found out (as documented on the Geodcoer providers page), that providers can be provided via composer:

composer require geocoder-php/nominatim-provider

(https://github.com/geocoder-php/nominatim-provider)

Afterwards you can select and enable them on the Geocoder admin page: admin/config/system/geocoder/geocoder-provider

Eventually you'll have to clear cache first!

As you can see on the screenshot, the module provides a link for a list of geocoder providers: https://packagist.org/providers/geocoder-php/provider-implementation

Nominatim works simply great! And without any costs for small projects!

php-http/client-implementation dependency

Should you encounter a composer error like this:

Problem 1
    - geocoder-php/common-http[4.1.0, ..., 4.4.0] require php-http/client-implementation ^1.0 -> could not be found in any version, but the following packages provide it:
      - symfony/http-client Provides powerful methods to fetch HTTP resources synchronously or asynchronously
      - php-http/guzzle6-adapter Guzzle 6 HTTP Adapter
      - symfony/symfony The Symfony PHP framework
      - php-http/curl-client PSR-18 and HTTPlug Async client with cURL
      - php-http/guzzle7-adapter Guzzle 7 HTTP Adapter
      - kriswallsmith/buzz Lightweight HTTP client
      - php-http/mock-client Mock HTTP client
      - php-http/socket-client Socket client for PHP-HTTP
      - php-http/guzzle5-adapter Guzzle 5 HTTP Adapter
      - php-http/react-adapter React HTTP Adapter
      - voku/httpful A Readable, Chainable, REST friendly, PHP HTTP Client
      - php-http/buzz-adapter Buzz HTTP Adapter
      - php-http/cakephp-adapter Cake adapter for PHP-HTTP
      - code-tool/curl-client cURL client
      - windwalker/http Windwalker Http package
      - swisnl/php-http-fixture-client Fixture client for PHP-HTTP
      - jorge-matricali/http-client A wrapper of libcurl that implements PSR-7 HTTP message interface.
      - windwalker/framework The next generation PHP framework.
      - juststeveking/http-slim A slim psr compliant http client to provide better interoperability.
      - betalabs/guzzle6-adapter Guzzle 6 HTTP Adapter
      ... and 33 more.
      Consider requiring one of these to satisfy the php-http/client-implementation requirement.
    - geocoder-php/nominatim-provider[5.5.0, ..., 5.5.1] require geocoder-php/common-http ^4.1 -> satisfiable by geocoder-php/common-http[4.1.0, 4.2.0, 4.3.0, 4.4.0].
    - Root composer.json requires geocoder-php/nominatim-provider ^5.5 -> satisfiable by geocoder-php/nominatim-provider[5.5.0, 5.5.1].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
 - It's a private package and you forgot to add a custom repository to find it

You may have to install one of the suggested dependencies which matches your environment best. For Drupal 9 I chose the Symfony implementation:

composer require symfony/http-client