Ref T8989, Add a "Visit URL" link to Phurl items.

Summary: Ref T8989, Add a "Visit URL" link to Phurl items and make it actionable if the URI has a valid protocol.

Test Plan:
- Create a Phurl object with a URI of "google.com".
- "Visit URL" action in action view should be greyed out.
- Edit object to have URI "http://google.com" and save. "Visit URL" link should be available and should redirect to the intended URL.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: chad, Korvin

Maniphest Tasks: T8989

Differential Revision: https://secure.phabricator.com/D14379

src/applications/phurl/controller/PhabricatorPhurlURLViewController.php

@@ -96,13 +96,33 @@ final class PhabricatorPhurlURLViewController
       $url,
       PhabricatorPolicyCapability::CAN_EDIT);
 
-    $actions->addAction(
-      id(new PhabricatorActionView())
-        ->setName(pht('Edit'))
-        ->setIcon('fa-pencil')
-        ->setHref($this->getApplicationURI("url/edit/{$id}/"))
-        ->setDisabled(!$can_edit)
-        ->setWorkflow(!$can_edit));
+    $allowed_protocols = PhabricatorEnv::getEnvConfig('uri.allowed-protocols');
+    $uri = new PhutilURI($url->getLongURL());
+    $url_protocol = $uri->getProtocol();
+
+    $can_access = false;
+    $redirect_uri = $url->getMonogram();
+
+    if (strlen($url_protocol)) {
+      $can_access = in_array($url_protocol, $allowed_protocols);
+      $redirect_uri = $uri;
+    }
+
+    $actions
+      ->addAction(
+        id(new PhabricatorActionView())
+          ->setName(pht('Edit'))
+          ->setIcon('fa-pencil')
+          ->setHref($this->getApplicationURI("url/edit/{$id}/"))
+          ->setDisabled(!$can_edit)
+          ->setWorkflow(!$can_edit))
+      ->addAction(
+        id(new PhabricatorActionView())
+          ->setName(pht('Visit URL'))
+          ->setIcon('fa-external-link')
+          ->setHref($redirect_uri)
+          ->setDisabled(!$can_edit || !$can_access)
+          ->setWorkflow(!$can_edit));
 
     return $actions;
   }