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<?php |
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namespace LibLynx\Connect; |
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use GuzzleHttp\ClientInterface; |
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use GuzzleHttp\Exception\RequestException; |
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use GuzzleHttp\Exception\GuzzleException; |
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use GuzzleHttp\Psr7\Request; |
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use LibLynx\Connect\Exception\APIException; |
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use LibLynx\Connect\Exception\LogicException; |
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use LibLynx\Connect\HTTPClient\HTTPClientFactory; |
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use LibLynx\Connect\Resource\Identification; |
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use Psr\Log\LoggerAwareInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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use Psr\SimpleCache\CacheInterface; |
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/** |
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* LibLynx Connect API client |
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* |
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* $liblynx=new Liblynx\Connect\Client; |
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* $liblynx->setCredentials('your client id', 'your client secret'); |
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* |
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* //must set a PSR-16 cache - this can be used for testing |
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* $liblynx->setCache(new \Symfony\Component\Cache\Simple\ArrayCache); |
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* |
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* $identification=$liblynx->authorize(Identification::fromSuperglobals()); |
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* if ($identification->isIdentified()) { |
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* //good to go |
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* } |
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* |
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* if ($identification->requiresWayf()) { |
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* $identification->doWayfRedirect(); |
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* } |
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* |
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* @package LibLynx\Connect |
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*/ |
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class Client implements LoggerAwareInterface |
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{ |
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private $apiroot = 'https://connect.liblynx.com'; |
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/** @var string client ID obtain from LibLynx Connect admin portal */ |
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private $clientId; |
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/** @var string client secret obtain from LibLynx Connect admin portal */ |
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private $clientSecret; |
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/** @var ClientInterface HTTP client for API requests */ |
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private $guzzle; |
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/** @var \stdClass entry point resource */ |
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private $entrypoint; |
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/** @var CacheInterface */ |
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protected $cache; |
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/** @var LoggerInterface */ |
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protected $log; |
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/** @var HTTPClientFactory */ |
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protected $httpClientFactory; |
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/** |
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* Create new LibLynx API client |
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*/ |
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public function __construct(HTTPClientFactory $clientFactory = null) |
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{ |
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if (isset($_SERVER['LIBLYNX_CLIENT_ID'])) { |
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$this->clientId = $_SERVER['LIBLYNX_CLIENT_ID']; |
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} |
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if (isset($_SERVER['LIBLYNX_CLIENT_SECRET'])) { |
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$this->clientSecret = $_SERVER['LIBLYNX_CLIENT_SECRET']; |
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} |
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$this->log = new NullLogger(); |
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$this->httpClientFactory = $clientFactory ?? new HTTPClientFactory; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function setLogger(LoggerInterface $logger) |
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{ |
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$this->log = $logger; |
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} |
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/** |
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* Set API root |
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* An alternative root may be provided to you by LibLynx Technical Support |
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* @param string $url |
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*/ |
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public function setAPIRoot($url) |
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{ |
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$this->apiroot = $url; |
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} |
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/** |
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* Set OAuth2.0 client credentials |
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* These will be provided to you by LibLynx Technical Support |
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* |
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* @param string $clientId |
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* @param string $clientSecret |
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*/ |
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public function setCredentials($clientId, $clientSecret) |
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{ |
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$this->clientId = $clientId; |
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$this->clientSecret = $clientSecret; |
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} |
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/** |
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* @return array containing client id and secret |
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*/ |
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public function getCredentials() |
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{ |
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return [$this->clientId, $this->clientSecret]; |
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} |
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/** |
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* Attempt an identification using the LibLynx API |
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* |
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* @param IdentificationRequest $request |
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* @return Identification|null |
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*/ |
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public function authorize(IdentificationRequest $request) |
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{ |
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$payload = $request->getRequestJSON(); |
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$response = $this->post('@new_identification', $payload); |
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if (!isset($response->id)) { |
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//failed |
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$this->log->critical('Identification request failed {payload}', ['payload' => $payload]); |
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return null; |
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} |
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$identification = new Identification($response); |
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$this->log->info( |
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'Identification request for ip {ip} on URL {url} succeeded status={status} id={id}', |
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[ |
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'status' => $identification->status, |
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'id' => $identification->id, |
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'ip' => $identification->ip, |
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'url' => $identification->url |
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] |
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); |
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return $identification; |
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} |
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/** |
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* General purpose 'GET' request against API |
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* @param $entrypoint string contains either an @entrypoint or full URL obtained from a resource |
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* @return mixed |
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*/ |
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public function get($entrypoint) |
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{ |
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return $this->makeAPIRequest('GET', $entrypoint); |
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} |
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/** |
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* General purpose 'POST' request against API |
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* @param $entrypoint string contains either an @entrypoint or full URL obtained from a resource |
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* @param $json string contains JSON formatted data to post |
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* @return mixed |
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*/ |
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public function post($entrypoint, $json) |
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{ |
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return $this->makeAPIRequest('POST', $entrypoint, $json); |
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} |
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/** |
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* General purpose 'PUT' request against API |
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* @param $entrypoint string contains either an @entrypoint or full URL obtained from a resource |
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* @return mixed string contains JSON formatted data to put |
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*/ |
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public function put($entrypoint, $json) |
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{ |
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return $this->makeAPIRequest('PUT', $entrypoint, $json); |
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} |
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/** |
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* @param $method |
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* @param $entrypoint |
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* @param null $json |
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* @return \stdClass object containing JSON decoded response - note this can be an error response for normally |
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* handled errors |
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* @throws LogicException for integration errors, e.g. not setting a cache |
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* @throws APIException for unexpected API failures |
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*/ |
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protected function makeAPIRequest($method, $entrypoint, $json = null) |
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{ |
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$this->log->debug('{method} {entry} {json}', ['method' => $method, 'entry' => $entrypoint, 'json' => $json]); |
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$url = $this->resolveEntryPoint($entrypoint); |
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$client = $this->getClient(); |
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$headers = ['Accept' => 'application/json']; |
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if (!empty($json)) { |
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$headers['Content-Type'] = 'application/json'; |
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} |
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$request = new Request($method, $url, $headers, $json); |
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try { |
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$response = $client->send($request); |
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$this->log->debug( |
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'{method} {entry} succeeded {status}', |
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['method' => $method, 'entry' => $entrypoint, 'status' => $response->getStatusCode()] |
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); |
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} catch (RequestException $e) { |
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//we usually have a response available, but it's not guaranteed |
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$response = $e->getResponse(); |
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$this->log->error( |
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'{method} {entrypoint} {json} failed ({status}): {body}', |
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[ |
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'method' => $method, |
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'json' => $json, |
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'entrypoint' => $entrypoint, |
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'status' => $response ? $response->getStatusCode() : 0, |
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'body' => $response ? $response->getBody() : '' |
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] |
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); |
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throw new APIException("$method $entrypoint request failed", $e->getCode(), $e); |
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} catch (GuzzleException $e) { |
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$this->log->critical( |
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'{method} {entry} {json} failed', |
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['method' => $method, 'json' => $json, 'entry' => $entrypoint] |
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); |
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throw new APIException("$method $entrypoint failed", 0, $e); |
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} |
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return json_decode($response->getBody()); |
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} |
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public function resolveEntryPoint($nameOrUrl) |
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{ |
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if ($nameOrUrl[0] === '@') { |
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$resolved = $this->getEntryPoint($nameOrUrl); |
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$this->log->debug( |
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'Entrypoint {entrypoint} resolves to {url}', |
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['entrypoint' => $nameOrUrl, 'url' => $resolved] |
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); |
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return $resolved; |
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} |
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//it's a URL |
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return $nameOrUrl; |
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} |
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public function getEntryPoint($name) |
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{ |
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if (!is_array($this->entrypoint)) { |
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$this->entrypoint = $this->getEntrypointResource(); |
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} else { |
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$this->log->debug('using previously loaded entrypoint'); |
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} |
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if (!isset($this->entrypoint->_links->$name->href)) { |
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throw new LogicException("Invalid LibLynx API entrypoint $name requested"); |
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} |
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return $this->entrypoint->_links->$name->href; |
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} |
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protected function getEntrypointResource() |
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{ |
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$key = 'entrypoint' . $this->clientId; |
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$cache = $this->getCache(); |
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if ($cache->has($key)) { |
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$this->log->debug('loading entrypoint from persistent cache'); |
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$entrypointResource = $cache->get($key); |
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; |
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} else { |
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$this->log->debug('entrypoint not cached, requesting from API'); |
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$entrypointResource = $this->get('api'); |
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$cache->set($key, $entrypointResource, 86400); |
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$this->log->info('entrypoint loaded from API and cached'); |
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} |
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return $entrypointResource; |
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} |
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public function getCache() |
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{ |
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if (is_null($this->cache)) { |
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throw new LogicException('LibLynx Connect Client requires a PSR-16 compatible cache'); |
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} |
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return $this->cache; |
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} |
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public function setCache(CacheInterface $cache) |
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{ |
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$this->cache = $cache; |
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} |
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/** |
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* Internal helper to provide an OAuth2 capable HTTP client |
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*/ |
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protected function getClient() |
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{ |
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if (empty($this->clientId)) { |
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throw new LogicException('Cannot make API calls until setCredentials has been called'); |
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} |
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if (!is_object($this->guzzle)) { |
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$this->guzzle = $this->httpClientFactory->create( |
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$this->apiroot, |
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$this->clientId, |
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$this->clientSecret, |
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$this->getCache() |
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); |
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} |
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return $this->guzzle; |
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} |
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} |
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