Add config.json default config option for "disable-tls" (FALSE by default)

src/Composer/Config.php

@@ -39,6 +39,7 @@ class Config
         'optimize-autoloader' => false,
         'prepend-autoloader' => true,
         'github-domains' => array('github.com'),
+        'disable-tls' => false
     );
 
     public static $defaultRepositories = array(
@@ -210,6 +211,9 @@ class Config
                 }
 
                 return $this->config[$key];
+                
+            case 'disable-tls':
+                return $this->config[$key]!== 'false' && (bool) $this->config[$key];
 
             default:
                 if (!isset($this->config[$key])) {

tests/Composer/Test/ConfigTest.php

@@ -117,4 +117,20 @@ class ConfigTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals(array('https'), $config->get('github-protocols'));
     }
+
+    /**
+     * @group TLS
+     */
+    public function testDisableTlsCanBeOverridden()
+    {
+        $config = new Config;
+        $config->merge(
+            array('config' => array('disable-tls' => 'false'))
+        );
+        $this->assertFalse($config->get('disable-tls'));
+        $config->merge(
+            array('config' => array('disable-tls' => 'true'))
+        );
+        $this->assertTrue($config->get('disable-tls'));
+    }
 }

tests/Composer/Test/DefaultConfigTest.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test;
+
+use Composer\Config;
+
+class DefaultConfigTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @group TLS
+     */
+    public function testDefaultValuesAreAsExpected()
+    {
+        $config = new Config;
+        $this->assertFalse($config->get('disable-tls'));
+    }
+
+}