Fixed validation of TRUSTED CA bundles

`CaBundle::validateCaFile` uses function openssl_x509_parse, which can only
parse regular certificate files, to parse trusted CA bundles (`BEGIN TRUSTED
CERTIFICATE` format).

Since there's no alternative to parse such format directly, this little
hack will let the parsing succeed.

src/CaBundle.php

@@ -174,6 +174,7 @@ public static function validateCaFile($filename, LoggerInterface $logger = null)
 
             $isValid = !empty($contents);
         } else {
+            $contents = preg_replace("/^(\\-+(?:BEGIN|END))\\s+TRUSTED\\s+(CERTIFICATE\\-+)\$/m", '$1 $2', $contents);
             $isValid = (bool) openssl_x509_parse($contents);
         }
 

tests/CaBundleTest.php

@@ -85,6 +85,15 @@ public function testValidateCaFile()
         $this->assertTrue($validResult);
     }
 
+    public function testValidateTrustedCaFile()
+    {
+        $certFilePath = __DIR__.'/Fixtures/ca-bundle.trust.crt';
+        $caBundle = new CaBundle();
+        $validResult = $caBundle::validateCaFile($certFilePath, null);
+
+        $this->assertTrue($validResult);
+    }
+
     public function testIsOpensslParseSafeTrue()
     {
         $stub = $this->getMockBuilder('Composer\CaBundle\CaBundleMock')->getMock();

tests/Fixtures/ca-bundle.trust.crt

@@ -0,0 +1,46 @@
+# ACCVRAIZ1
+-----BEGIN TRUSTED CERTIFICATE-----
+MIIH0zCCBbugAwIBAgIIXsO3pkN/pOAwDQYJKoZIhvcNAQEFBQAwQjESMBAGA1UE
+AwwJQUNDVlJBSVoxMRAwDgYDVQQLDAdQS0lBQ0NWMQ0wCwYDVQQKDARBQ0NWMQsw
+CQYDVQQGEwJFUzAeFw0xMTA1MDUwOTM3MzdaFw0zMDEyMzEwOTM3MzdaMEIxEjAQ
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+BQUHAwQGCCsGAQUFBwMBDAlBQ0NWUkFJWjE=
+-----END TRUSTED CERTIFICATE-----