feat: Throw an InvalidRequest whenever a curl request fails

TROUBLESHOOTING.md

@@ -3,6 +3,7 @@ If you can't find a solution below, please open an [issue](https://github.com/se
 ## Table of Contents
 
 * [Viewing the Request Body](#request-body)
+* [Handling SSL Errors](#ssl-errors)
 
 <a name="request-body"></a>
 ## Viewing the Request Body
@@ -14,3 +15,10 @@ echo $response->statusCode();
 echo $response->body();
 echo $response->headers();
 ```
+
+<a name="ssl-errors">
+## Handling SSL Errors
+
+If any SSL errors occur during API calls, an `InvalidRequest` will be thrown. This will provide information to help debug the issue further.
+
+If the issue is caused by an unrecognized certificate, it may be possible that PHP is unable to locate your system's CA bundle. An easy fix would be requiring the `composer/ca-bundle` package - this library will automatically detect and use that to locate the CA bundle, or use Mozilla's as a fallback.

composer.json

@@ -27,6 +27,9 @@
         "squizlabs/php_codesniffer": "~2.0",
         "friendsofphp/php-cs-fixer": "^2.16"
     },
+    "suggest": {
+        "composer/ca-bundle": "Including this library will ensure that a valid CA bundle is available for secure connections"
+    },
     "autoload": {
         "psr-4": {
             "SendGrid\\": "lib/"

lib/Client.php

@@ -369,6 +369,15 @@ private function createCurlOptions($method, $body = null, $headers = null)
         }
         $options[CURLOPT_HTTPHEADER] = $headers;
 
+        if (class_exists('\\Composer\\CaBundle\\CaBundle') && method_exists('\\Composer\\CaBundle\\CaBundle', 'getSystemCaRootBundlePath')) {
+            $caPathOrFile = \Composer\CaBundle\CaBundle::getSystemCaRootBundlePath();
+            if (is_dir($caPathOrFile) || (is_link($caPathOrFile) && is_dir(readlink($caPathOrFile)))) {
+                $options[CURLOPT_CAPATH] = $caPathOrFile;
+            } else {
+                $options[CURLOPT_CAINFO] = $caPathOrFile;
+            }
+        }
+
         return $options;
     }
 
@@ -492,6 +501,8 @@ public function makeRequest($method, $url, $body = null, $headers = null, $retry
      * @param array $requests
      *
      * @return Response[]
+     *
+     * @throws InvalidRequest
      */
     public function makeAllRequests(array $requests = [])
     {
@@ -512,6 +523,11 @@ public function makeAllRequests(array $requests = [])
         $sleepDurations = 0;
         foreach ($channels as $id => $channel) {
             $content = curl_multi_getcontent($channel);
+
+            if ($content === false) {
+                throw new InvalidRequest(curl_error($channel), curl_errno($channel));
+            }
+
             $response = $this->parseResponse($channel, $content);
 
             if ($requests[$id]['retryOnLimit'] && $response->statusCode() === self::TOO_MANY_REQUESTS_HTTP_CODE) {

test/unit/ClientTest.php

@@ -33,7 +33,7 @@ public function testConstructor()
         $this->assertAttributeEquals([], 'path', $this->client);
         $this->assertAttributeEquals([], 'curlOptions', $this->client);
         $this->assertAttributeEquals(false, 'retryOnLimit', $this->client);
-        $this->assertAttributeEquals(['get', 'post', 'patch',  'put', 'delete'], 'methods', $this->client);
+        $this->assertAttributeEquals(['get', 'post', 'patch', 'put', 'delete'], 'methods', $this->client);
     }
 
     public function test_()
@@ -209,6 +209,15 @@ public function testThrowExceptionOnInvalidCall()
         $client->get();
     }
 
+    public function testMakeRequestWithUntrustedRootCert()
+    {
+        $this->expectException(InvalidRequest::class);
+        $this->expectExceptionMessageRegExp('/certificate/i');
+
+        $client = new Client('https://untrusted-root.badssl.com/');
+        $client->makeRequest('GET', 'https://untrusted-root.badssl.com/');
+    }
+
     /**
      * @param object $obj
      * @param string $name