Add some create mail handlers for paste and files

Summary: Fixes T1144. Though actually I think T1144 wanted some handy way to email from the command-line / arc, this is cooler. :D

Test Plan: set conf properly and then ./bin/mail receive-test --as btrahan --to pasties@phabricator.dev | README  --> it worked...! couldn't test files as easily but verified exception thrown when I tried to test.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1144

Differential Revision: https://secure.phabricator.com/D6622

src/applications/files/config/PhabricatorFilesConfigOptions.php

@@ -154,6 +154,11 @@ final class PhabricatorFilesConfigOptions
             "Specify this limit in bytes, or using a 'K', 'M', or 'G' ".
             "suffix."))
         ->addExample('10M', pht("Allow Uploads 10MB or Smaller")),
+     $this->newOption(
+        'metamta.files.public-create-email',
+        'string',
+        null)
+       ->setDescription(pht('Allow uploaded files via email.')),
      $this->newOption('files.enable-imagemagick', 'bool', false)
        ->setBoolOptions(
          array(

src/applications/files/mail/FilesCreateMailReceiver.php

@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * @group files
+ */
+final class FilesCreateMailReceiver
+  extends PhabricatorMailReceiver {
+
+  public function isEnabled() {
+    $app_class = 'PhabricatorApplicationFiles';
+    return PhabricatorApplication::isClassInstalled($app_class);
+  }
+
+  public function canAcceptMail(PhabricatorMetaMTAReceivedMail $mail) {
+    $config_key = 'metamta.files.public-create-email';
+    $create_address = PhabricatorEnv::getEnvConfig($config_key);
+    if (!$create_address) {
+      return false;
+    }
+
+    foreach ($mail->getToAddresses() as $to_address) {
+      if ($this->matchAddresses($create_address, $to_address)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  protected function processReceivedMail(
+    PhabricatorMetaMTAReceivedMail $mail,
+    PhabricatorUser $sender) {
+
+    $attachment_phids = $mail->getAttachments();
+    if (empty($attachment_phids)) {
+      throw new PhabricatorMetaMTAReceivedMailProcessingException(
+        MetaMTAReceivedMailStatus::STATUS_UNHANDLED_EXCEPTION,
+        'Ignoring email to create files that did not include attachments.');
+    }
+    $first_phid = head($attachment_phids);
+    $mail->setRelatedPHID($first_phid);
+
+    $attachment_count = count($attachment_phids);
+    if ($attachment_count > 1) {
+      $subject = pht(
+        'You successfully uploaded %d files.',
+        $attachment_count);
+    } else {
+      $subject = pht('You successfully uploaded a file.');
+    }
+
+    $file_uris = array();
+    foreach ($attachment_phids as $phid) {
+      $file_uris[] =
+        PhabricatorEnv::getProductionURI('/file/info/'.$phid.'/');
+    }
+
+    $body = new PhabricatorMetaMTAMailBody();
+    $body->addRawSection($subject);
+    $body->addTextSection(pht('FILE LINKS'), implode("\n", $file_uris));
+
+    id(new PhabricatorMetaMTAMail())
+      ->addTos(array($sender->getPHID()))
+      ->setSubject('[Files] '.$subject)
+      ->setFrom($sender->getPHID())
+      ->setRelatedPHID($first_phid)
+      ->setBody($body->render())
+      ->saveAndSend();
+  }
+
+}