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<?php
// AJAX call to fetch a new background image
// http://stackoverflow.com/a/24707821 => use instead of file_get_contents for external URL's
function curl_get_contents($url, $headers = null) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
// Include potential headers with request
if (!empty($headers)) {
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
}
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
// Traverse a JSON object given a string selector
function traverse_json($json, $selector) {
$regex = "\[\'?([{}a-z0-9_]+)\'?\]";
preg_match_all('/' . $regex . '/i', $selector, $matches);
// Go through each regex match and traverse the JSON object given the keys
$obj = $json;
foreach ($matches[1] as $i => $match) {
if ($match == '{random}' && is_array($obj)) {
// Let's fetch a random index of the array
$rand = rand(0, count($obj));
$obj = $obj[$rand];
} else {
// Keep traversing the object
$obj = $obj[$match];
}
}
return $obj;
}
$config = json_decode(file_get_contents(dirname(__FILE__) . "/../../config.json"), true);
if (!empty($config['custom_url'])) {
// We're fetching from a custom URL
$json = json_decode(curl_get_contents($config['custom_url'], $config['custom_url_headers']), true);
$image_url = traverse_json($json, $config['custom_url_selector']);
echo json_encode(array('success' => 1, 'url' => $image_url));
} else if (!empty($config['unsplash_client_id'])) {
// We're fetching from Unsplash's API
$url = "https://api.unsplash.com/photos/random?per_page=1&client_id=" . $config['unsplash_client_id'];
$json = json_decode(curl_get_contents($url), true);
$image_url = $json['urls']['regular'];
$image_user_name = $json['user']['name'];
$image_user_url = $json['user']['links']['html'];
echo json_encode(array('success' => 1, 'url' => $image_url, 'image_user_name' => $image_user_name, 'image_user_url' => $image_user_url));
}
die();
?>
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