"arc install-certificate", server-side components

Summary:
Provides a new workflow for making it non-horrible to install certificates.
Basically you run "arc install-certificate" and then copy/paste a short token
off a webpage and it does the ~/.arcrc edits for you.

Test Plan:
Installed certificates, used bad tokens, hit rate limiting.

Reviewed By: aran
Reviewers: aran, jungejason, tuomaspelkonen
CC: aran
Differential Revision: 460

src/applications/conduit/controller/token/PhabricatorConduitTokenController.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class PhabricatorConduitTokenController extends PhabricatorConduitController {
+
+  public function processRequest() {
+
+    $user = $this->getRequest()->getUser();
+
+    $old_token = id(new PhabricatorConduitCertificateToken())
+      ->loadOneWhere(
+        'userPHID = %s',
+        $user->getPHID());
+    if ($old_token) {
+      $old_token->delete();
+    }
+
+    $token = id(new PhabricatorConduitCertificateToken())
+      ->setUserPHID($user->getPHID())
+      ->setToken(sha1(Filesystem::readRandomBytes(128)))
+      ->save();
+
+    $panel = new AphrontPanelView();
+    $panel->setHeader('Certificate Install Token');
+    $panel->setWidth(AphrontPanelView::WIDTH_FORM);
+
+    $panel->appendChild(
+      '<p class="aphront-form-instructions">Copy and paste this token into '.
+      'the prompt given to you by "arc install-certificate":</p>'.
+      '<p style="padding: 0 0 1em 4em;">'.
+        '<strong>'.phutil_escape_html($token->getToken()).'</strong>'.
+      '</p>'.
+      '<p class="aphront-form-instructions">arc will then complete the '.
+      'install process for you.</p>');
+
+
+    return $this->buildStandardPageResponse(
+      $panel,
+      array(
+        'title' => 'Certificate Install Token',
+      ));
+  }
+}

src/applications/conduit/controller/token/__init__.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/conduit/controller/base');
+phutil_require_module('phabricator', 'applications/conduit/storage/token');
+phutil_require_module('phabricator', 'view/layout/panel');
+
+phutil_require_module('phutil', 'filesystem');
+phutil_require_module('phutil', 'markup');
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('PhabricatorConduitTokenController.php');