call_user_func doesn't work in this context with private or protected functions. This should solve an issue encountered when using php-vcr with the PayPal SDK (paypal/PayPal-PHP-SDK#1057).

Author: alnorth

src/VCR/Util/CurlHelper.php

@@ -58,7 +58,7 @@ public static function handleOutput(Response $response, array $curlOptions, $ch)
  $headerList = array_merge($headerList, HttpUtil::formatHeadersForCurl($response->getHeaders()));
  $headerList[] = '';
  foreach ($headerList as $header) {
- \call_user_func($curlOptions[CURLOPT_HEADERFUNCTION], $ch, $header);
+ self::callFunction($curlOptions[CURLOPT_HEADERFUNCTION], $ch, $header);
  }
  }
 
@@ -69,7 +69,7 @@ public static function handleOutput(Response $response, array $curlOptions, $ch)
  }
 
  if (isset($curlOptions[CURLOPT_WRITEFUNCTION])) {
- \call_user_func($curlOptions[CURLOPT_WRITEFUNCTION], $ch, $body);
+ self::callFunction($curlOptions[CURLOPT_WRITEFUNCTION], $ch, $body);
  } elseif (isset($curlOptions[CURLOPT_RETURNTRANSFER]) && true == $curlOptions[CURLOPT_RETURNTRANSFER]) {
  return $body;
  } elseif (isset($curlOptions[CURLOPT_FILE])) {
@@ -213,4 +213,28 @@ public static function validateCurlPOSTBody(Request $request, $curlHandle = null
  $body = \call_user_func_array($readFunction, [$curlHandle, fopen('php://memory', 'r'), $bodySize]);
  $request->setBody($body);
  }
+
+ /**
+ * A wrapper around call_user_func that attempts to properly handle private
+ * and protected methods on objects.
+ *
+ * @param mixed $callback The callable to pass to call_user_func
+ * @param resource $curlHandle cURL handle associated with the request
+ * @param mixed $argument The third argument to pass to call_user_func
+ *
+ * @return mixed value returned by the callback function
+ */
+ private static function callFunction($callback, $curlHandle, $argument)
+ {
+ if (!\is_callable($callback) && \is_array($callback) && 2 === \count($callback)) {
+ // This is probably a private or protected method on an object. Try and
+ // make it accessible.
+ $method = new \ReflectionMethod($callback[0], $callback[1]);
+ $method->setAccessible(true);
+
+ return $method->invoke($callback[0], $curlHandle, $argument);
+ } else {
+ return \call_user_func($callback, $curlHandle, $argument);
+ }
+ }
 }

tests/VCR/Util/CurlHelperTest.php

@@ -267,6 +267,81 @@ public function testHandleOutputHeaderFunction()
  $this->assertEquals($expected, $actualHeaders);
  }
 
+ public function testHandleOutputHeaderFunctionWithPublicFunction()
+ {
+ $this->headersFound = [];
+ $curlOptions = [
+ CURLOPT_HEADERFUNCTION => [$this, 'publicCurlHeaderFunction'],
+ ];
+ $status = [
+ 'code' => 200,
+ 'message' => 'OK',
+ 'http_version' => '1.1',
+ ];
+ $headers = [
+ 'Content-Length' => 0,
+ ];
+ $response = new Response($status, $headers, 'example response');
+ CurlHelper::handleOutput($response, $curlOptions, curl_init());
+
+ $expected = [
+ 'HTTP/1.1 200 OK',
+ 'Content-Length: 0',
+ '',
+ ];
+ $this->assertEquals($expected, $this->headersFound);
+ }
+
+ public function testHandleOutputHeaderFunctionWithProtectedFunction()
+ {
+ $this->headersFound = [];
+ $curlOptions = [
+ CURLOPT_HEADERFUNCTION => [$this, 'protectedCurlHeaderFunction'],
+ ];
+ $status = [
+ 'code' => 200,
+ 'message' => 'OK',
+ 'http_version' => '1.1',
+ ];
+ $headers = [
+ 'Content-Length' => 0,
+ ];
+ $response = new Response($status, $headers, 'example response');
+ CurlHelper::handleOutput($response, $curlOptions, curl_init());
+
+ $expected = [
+ 'HTTP/1.1 200 OK',
+ 'Content-Length: 0',
+ '',
+ ];
+ $this->assertEquals($expected, $this->headersFound);
+ }
+
+ public function testHandleOutputHeaderFunctionWithPrivateFunction()
+ {
+ $this->headersFound = [];
+ $curlOptions = [
+ CURLOPT_HEADERFUNCTION => [$this, 'privateCurlHeaderFunction'],
+ ];
+ $status = [
+ 'code' => 200,
+ 'message' => 'OK',
+ 'http_version' => '1.1',
+ ];
+ $headers = [
+ 'Content-Length' => 0,
+ ];
+ $response = new Response($status, $headers, 'example response');
+ CurlHelper::handleOutput($response, $curlOptions, curl_init());
+
+ $expected = [
+ 'HTTP/1.1 200 OK',
+ 'Content-Length: 0',
+ '',
+ ];
+ $this->assertEquals($expected, $this->headersFound);
+ }
+
  public function testHandleResponseUsesWriteFunction()
  {
  $test = $this;
@@ -285,6 +360,19 @@ public function testHandleResponseUsesWriteFunction()
  CurlHelper::handleOutput($response, $curlOptions, $expectedCh);
  }
 
+ public function testHandleResponseUsesWriteFunctionWithPrivateFunction()
+ {
+ $test = $this;
+ $expectedCh = curl_init();
+ $expectedBody = 'example response';
+ $curlOptions = [
+ CURLOPT_WRITEFUNCTION => [$this, 'privateCurlWriteFunction'],
+ ];
+ $response = new Response(200, [], $expectedBody);
+
+ CurlHelper::handleOutput($response, $curlOptions, $expectedCh);
+ }
+
  public function testHandleResponseWritesFile()
  {
  vfsStream::setup('test');
@@ -441,4 +529,31 @@ public function testCurlCustomRequestAlwaysOverridesMethod()
 
  $this->assertEquals('DELETE', $request->getMethod());
  }
+
+ // Function used for testing CURLOPT_HEADERFUNCTION
+ public function publicCurlHeaderFunction($ch, $header)
+ {
+ $this->headersFound[] = $header;
+ }
+
+ // Function used for testing CURLOPT_HEADERFUNCTION
+ protected function protectedCurlHeaderFunction($ch, $header)
+ {
+ $this->headersFound[] = $header;
+ }
+
+ // Function used for testing CURLOPT_HEADERFUNCTION
+ private function privateCurlHeaderFunction($ch, $header)
+ {
+ $this->headersFound[] = $header;
+ }
+
+ // Function used for testing CURLOPT_WRITEFUNCTION
+ private function privateCurlWriteFunction($ch, $body)
+ {
+ $this->assertEquals('resource', \gettype($ch));
+ $this->assertEquals('example response', $body);
+
+ return \strlen($body);
+ }
 }