Get custom data (Flickr feed) in TypoScript using a custom FlowQuery operation in Neos – Included in https://speakerdeck.com/aertmann/tasty-recipes-for-every-day-neos

FlickrOperation.php

<?php
namespace Venstre\VenstreDk\TypoScript\FlowQueryOperations;

use TYPO3\Eel\FlowQuery\FlowQuery;
use TYPO3\Eel\FlowQuery\Operations\AbstractOperation;
use TYPO3\Flow\Annotations as Flow;

class FlickrOperation extends AbstractOperation {

	const API_KEY = '';

	/**
	 * {@inheritdoc}
	 *
	 * @var string
	 */
	static protected $shortName = 'flickr';

	/**
	 * {@inheritdoc}
	 *
	 * @var integer
	 */
	static protected $priority = 100;

	/**
	 * {@inheritdoc}
	 *
	 * @param array (or array-like object) $context onto which this operation should be applied
	 * @return boolean TRUE if the operation can be applied onto the $context, FALSE otherwise
	 */
	public function canEvaluate($context) {
		return TRUE;
	}

	/**
	 * @param FlowQuery $flowQuery the FlowQuery object
	 * @param array $arguments the arguments for this operation
	 * @return void
	 */
	public function evaluate(FlowQuery $flowQuery, array $arguments) {
		$output = array();
		$photos = $this->query('method=flickr.people.getPublicPhotos&api_key=' . self::API_KEY . '&user_id=49542087@N05&safe_search=&per_page=8&page=1&format=json&nojsoncallback=1');
		foreach ($photos['photos']['photo'] as $photo) {
			$sizes = $this->query('method=flickr.photos.getSizes&api_key=' . self::API_KEY . '&photo_id=' . $photo['id'] . '&format=json&nojsoncallback=1');
			$output[] = array('source' => $sizes['sizes']['size'][0]['source'], 'url' => 'https://www.flickr.com/photos/101566716@N03/' . $photo['id'], 'title' => $photo['title']);
		}
		$flowQuery->setContext($output);
	}

	/**
	 * @param string $query
	 * @return array
	 */
	protected function query($query) {
		return json_decode(file_get_contents('https://api.flickr.com/services/rest/?' . $query), TRUE);
	}
}