Add the ability to create a macro from a url

Test Plan: Enter in a url and create a macro. :)

Reviewers: epriestley

Reviewed By: epriestley

CC: epriestley, aran, dctrwatson, Korvin

Differential Revision: https://secure.phabricator.com/D5039

src/applications/files/storage/PhabricatorFile.php

@@ -333,7 +333,12 @@ final class PhabricatorFile extends PhabricatorFileDAO
   }
 
 
-  public static function newFromFileDownload($uri, array $params) {
+  public static function newFromFileDownload($uri, array $params = array()) {
+    // Make sure we're allowed to make a request first
+    if (!PhabricatorEnv::getEnvConfig('security.allow-outbound-http')) {
+      throw new Exception("Outbound HTTP requests are disabled!");
+    }
+
     $uri = new PhutilURI($uri);
 
     $protocol = $uri->getProtocol();
@@ -352,6 +357,10 @@ final class PhabricatorFile extends PhabricatorFileDAO
         ->setTimeout($timeout)
         ->resolvex();
 
+    $params = $params + array(
+      'name' => basename($uri),
+    );
+
     return self::newFromFileData($file_data, $params);
   }