/**
* Gets a script url from sourcepoint and caches it for a day.
*
* @return array
*/
protected function getAsScript()
{
$apiUrl = trim($this->getTemplateVariable('api_url'));
$apiKey = trim($this->getTemplateVariable('api_key'));
$failedValue = '<!--sourcepoint-failed-->';
$cacheKey = 'wblib:sourcepoint:script';
if (empty($apiUrl) || empty($apiKey)) {
return ['data' => ['script' => $failedValue]];
}
$cachedScript = $this->cacheStore->get($cacheKey);
if (false !== $cachedScript) {
return ['data' => ['script' => $cachedScript]];
}
$scriptEndpoint = sprintf('%sscript?delivery=script', $apiUrl);
$script = null;
try {
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $scriptEndpoint);
curl_setopt($curl, CURLOPT_HTTPHEADER, [sprintf('Authorization: Token %s', $apiKey)]);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 1);
curl_setopt($curl, CURLOPT_TIMEOUT, 1);
$script = trim(curl_exec($curl));
curl_close($curl);
// validate script tag
// e.g.: "<script async="async" data-client-id="RXcVfPPwlbdGjwq" type="text/javascript" src="//d3ujids68p6xmq.cloudfront.net/abw.js"></script>"
if (preg_match('/^<script/i', $script)) {
$this->cacheStore->put($cacheKey, $script, $this->cacheTtl);
} else {
$this->Logger->error(sprintf('Expected a script tag but got: %s', $script));
$script = $failedValue;
$this->cacheStore->put($cacheKey, $failedValue, $this->failedCacheTtl);
}
} catch (\Exception $e) {
$this->Logger->error(sprintf('CURL to [%s] failed with: %s', $scriptEndpoint, $e->getMessage()));
$this->cacheStore->put($cacheKey, $failedValue, $this->failedCacheTtl);
}
return ['data' => ['script' => $script]];
}
/**
* Creates lock for the given slug. Lock will only last for 10 seconds.
*
* @param string $slug
* @throws \Exception
*/
protected function getLock($slug)
{
$i = 0;
do {
if ($existingLock = $this->cacheStore->get($this->getLockKey($slug))) {
usleep(200000);
// 200 milliseconds
$i += 0.2;
}
} while ($existingLock && $i < 5);
if ($existingLock) {
throw new \Exception(sprintf('Failed to acquire lock for slug "%s", currently locked by "%s".', $slug, $existingLock));
}
$this->cacheStore->put($this->getLockKey($slug), $this->getUser()->Slug, 10);
}