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<?php
namespace PayPalHttp;
/**
* Class HttpClient
* @package PayPalHttp
*
* Client used to make HTTP requests.
*/
class HttpClient
{
/**
* @var Environment
*/
public $environment;
/**
* @var Injector[]
*/
public $injectors = [];
/**
* @var Encoder
*/
public $encoder;
/**
* HttpClient constructor. Pass the environment you wish to make calls to.
*
* @param Environment $environment
* @see Environment
*/
function __construct(Environment $environment)
{
$this->environment = $environment;
$this->encoder = new Encoder();
$this->curlCls = Curl::class;
}
/**
* Injectors are blocks that can be used for executing arbitrary pre-flight logic, such as modifying a request or logging data.
* Executed in first-in first-out order.
*
* @param Injector $inj
*/
public function addInjector(Injector $inj)
{
$this->injectors[] = $inj;
}
/**
* The method that takes an HTTP request, serializes the request, makes a call to given environment, and deserialize response
*
* @param HttpRequest $httpRequest
* @return HttpResponse
*
* @throws HttpException
* @throws IOException
*/
public function execute(HttpRequest $httpRequest)
{
$requestCpy = clone $httpRequest;
$curl = new Curl();
foreach ($this->injectors as $inj) {
$inj->inject($requestCpy);
}
$url = $this->environment->baseUrl() . $requestCpy->path;
$formattedHeaders = $this->prepareHeaders($requestCpy->headers);
if (!array_key_exists("user-agent", $formattedHeaders)) {
$requestCpy->headers["user-agent"] = $this->userAgent();
}
$body = "";
if (!is_null($requestCpy->body)) {
$rawHeaders = $requestCpy->headers;
$requestCpy->headers = $formattedHeaders;
$body = $this->encoder->serializeRequest($requestCpy);
$requestCpy->headers = $this->mapHeaders($rawHeaders,$requestCpy->headers);
}
$curl->setOpt(CURLOPT_URL, $url);
$curl->setOpt(CURLOPT_CUSTOMREQUEST, $requestCpy->verb);
$curl->setOpt(CURLOPT_HTTPHEADER, $this->serializeHeaders($requestCpy->headers));
$curl->setOpt(CURLOPT_RETURNTRANSFER, 1);
$curl->setOpt(CURLOPT_HEADER, 0);
if (!is_null($requestCpy->body)) {
$curl->setOpt(CURLOPT_POSTFIELDS, $body);
}
if (strpos($this->environment->baseUrl(), "https://") === 0) {
$curl->setOpt(CURLOPT_SSL_VERIFYPEER, true);
$curl->setOpt(CURLOPT_SSL_VERIFYHOST, 2);
}
if ($caCertPath = $this->getCACertFilePath()) {
$curl->setOpt(CURLOPT_CAINFO, $caCertPath);
}
$response = $this->parseResponse($curl);
$curl->close();
return $response;
}
/**
* Returns an array representing headers with their keys
* to be lower case
* @param $headers
* @return array
*/
public function prepareHeaders($headers){
$preparedHeaders = array_change_key_case($headers);
if (array_key_exists("content-type", $preparedHeaders)) {
$preparedHeaders["content-type"] = strtolower($preparedHeaders["content-type"]);
}
return $preparedHeaders;
}
/**
* Returns an array representing headers with their key in
* original cases and updated values
* @param $rawHeaders
* @param $formattedHeaders
* @return array
*/
public function mapHeaders($rawHeaders, $formattedHeaders){
$rawHeadersKey = array_keys($rawHeaders);
foreach ($rawHeadersKey as $array_key) {
if(array_key_exists(strtolower($array_key), $formattedHeaders)){
$rawHeaders[$array_key] = $formattedHeaders[strtolower($array_key)];
}
}
return $rawHeaders;
}
/**
* Returns default user-agent
*
* @return string
*/
public function userAgent()
{
return "PayPalHttp-PHP HTTP/1.1";
}
/**
* Return the filepath to your custom CA Cert if needed.
* @return string
*/
protected function getCACertFilePath()
{
return null;
}
protected function setCurl(Curl $curl)
{
$this->curl = $curl;
}
protected function setEncoder(Encoder $encoder)
{
$this->encoder = $encoder;
}
private function serializeHeaders($headers)
{
$headerArray = [];
if ($headers) {
foreach ($headers as $key => $val) {
$headerArray[] = $key . ": " . $val;
}
}
return $headerArray;
}
private function parseResponse($curl)
{
$headers = [];
$curl->setOpt(CURLOPT_HEADERFUNCTION,
function($curl, $header) use (&$headers)
{
$len = strlen($header);
$k = "";
$v = "";
$this->deserializeHeader($header, $k, $v);
$headers[$k] = $v;
return $len;
});
$responseData = $curl->exec();
$statusCode = $curl->getInfo(CURLINFO_HTTP_CODE);
$errorCode = $curl->errNo();
$error = $curl->error();
if ($errorCode > 0) {
throw new IOException($error, $errorCode);
}
$body = $responseData;
if ($statusCode >= 200 && $statusCode < 300) {
$responseBody = NULL;
if (!empty($body)) {
$responseBody = $this->encoder->deserializeResponse($body, $this->prepareHeaders($headers));
}
return new HttpResponse(
$errorCode === 0 ? $statusCode : $errorCode,
$responseBody,
$headers
);
} else {
throw new HttpException($body, $statusCode, $headers);
}
}
private function deserializeHeader($header, &$key, &$value)
{
if (strlen($header) > 0) {
if (empty($header) || strpos($header, ':') === false) {
return NULL;
}
list($k, $v) = explode(":", $header);
$key = trim($k);
$value = trim($v);
}
}
}
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