Send mail to targets in the user's translation

Summary: Ref T6367.

Test Plan:
  - Added and executed unit tests.
  - Sent mail to A (en_US) and B (en_A*).
  - Got one mail in English and one mail in ENGLISH.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6367

Differential Revision: https://secure.phabricator.com/D13142

src/__phutil_library_map__.php

@@ -1976,6 +1976,8 @@ phutil_register_library_map(array(
     'PhabricatorListFilterUIExample' => 'applications/uiexample/examples/PhabricatorListFilterUIExample.php',
     'PhabricatorLocalDiskFileStorageEngine' => 'applications/files/engine/PhabricatorLocalDiskFileStorageEngine.php',
     'PhabricatorLocalTimeTestCase' => 'view/__tests__/PhabricatorLocalTimeTestCase.php',
+    'PhabricatorLocaleScopeGuard' => 'infrastructure/internationalization/scope/PhabricatorLocaleScopeGuard.php',
+    'PhabricatorLocaleScopeGuardTestCase' => 'infrastructure/internationalization/scope/__tests__/PhabricatorLocaleScopeGuardTestCase.php',
     'PhabricatorLogTriggerAction' => 'infrastructure/daemon/workers/action/PhabricatorLogTriggerAction.php',
     'PhabricatorLogoutController' => 'applications/auth/controller/PhabricatorLogoutController.php',
     'PhabricatorLunarPhasePolicyRule' => 'applications/policy/rule/PhabricatorLunarPhasePolicyRule.php',
@@ -5389,6 +5391,8 @@ phutil_register_library_map(array(
     'PhabricatorListFilterUIExample' => 'PhabricatorUIExample',
     'PhabricatorLocalDiskFileStorageEngine' => 'PhabricatorFileStorageEngine',
     'PhabricatorLocalTimeTestCase' => 'PhabricatorTestCase',
+    'PhabricatorLocaleScopeGuard' => 'Phobject',
+    'PhabricatorLocaleScopeGuardTestCase' => 'PhabricatorTestCase',
     'PhabricatorLogTriggerAction' => 'PhabricatorTriggerAction',
     'PhabricatorLogoutController' => 'PhabricatorAuthController',
     'PhabricatorLunarPhasePolicyRule' => 'PhabricatorPolicyRule',

src/applications/base/controller/PhabricatorController.php

@@ -114,10 +114,7 @@ abstract class PhabricatorController extends AphrontController {
       $request->setUser($user);
     }
 
-    $locale_code = $user->getTranslation();
-    if ($locale_code) {
-      PhabricatorEnv::setLocaleCode($locale_code);
-    }
+    PhabricatorEnv::setLocaleCode($user->getTranslation());
 
     $preferences = $user->loadPreferences();
     if (PhabricatorEnv::getEnvConfig('darkconsole.enabled')) {

src/applications/repository/worker/PhabricatorRepositoryPushMailWorker.php

@@ -42,7 +42,8 @@ final class PhabricatorRepositoryPushMailWorker
 
     $task_data = $this->getTaskData();
     $viewer = $target->getViewer();
-    // TODO: Swap locale to viewer locale.
+
+    $locale = PhabricatorEnv::beginScopedLocale($viewer->getTranslation());
 
     $logs = $event->getLogs();
 

src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php

@@ -2139,8 +2139,10 @@ abstract class PhabricatorApplicationTransactionEditor
     $mailed = array();
     foreach ($targets as $target) {
       $original_actor = $this->getActor();
-      $this->setActor($target->getViewer());
-      // TODO: Swap locale to viewer locale.
+
+      $viewer = $target->getViewer();
+      $this->setActor($viewer);
+      $locale = PhabricatorEnv::beginScopedLocale($viewer->getTranslation());
 
       $caught = null;
       try {
@@ -2153,6 +2155,8 @@ abstract class PhabricatorApplicationTransactionEditor
       }
 
       $this->setActor($original_actor);
+      unset($locale);
+
       if ($caught) {
         throw $ex;
       }

src/infrastructure/env/PhabricatorEnv.php

@@ -129,7 +129,19 @@ final class PhabricatorEnv {
     self::setLocaleCode('en_US');
   }
 
+  public static function beginScopedLocale($locale_code) {
+    return new PhabricatorLocaleScopeGuard($locale_code);
+  }
+
+  public static function getLocaleCode() {
+    return self::$localeCode;
+  }
+
   public static function setLocaleCode($locale_code) {
+    if (!$locale_code) {
+      return;
+    }
+
     if ($locale_code == self::$localeCode) {
       return;
     }

src/infrastructure/internationalization/scope/PhabricatorLocaleScopeGuard.php

@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Change the effective locale for the lifetime of this guard.
+ *
+ * Use @{method:PhabricatorEnv::beginScopedLocale} to acquire a guard.
+ * Guards are released when they exit scope.
+ */
+final class PhabricatorLocaleScopeGuard
+  extends Phobject {
+
+  private static $stack = array();
+  private $key;
+  private $destroyed;
+
+  public function __construct($code) {
+    // If this is the first time we're building a guard, push the default
+    // locale onto the bottom of the stack. We'll never remove it.
+    if (empty(self::$stack)) {
+      self::$stack[] = PhabricatorEnv::getLocaleCode();
+    }
+
+    // If there's no locale, use the server default locale.
+    if (!$code) {
+      $code = self::$stack[0];
+    }
+
+    // Push this new locale onto the stack and set it as the active locale.
+    // We keep track of which key this guard owns, in case guards are destroyed
+    // out-of-order.
+    self::$stack[] = $code;
+    $this->key = last_key(self::$stack);
+
+    PhabricatorEnv::setLocaleCode($code);
+  }
+
+  public function __destruct() {
+    if ($this->destroyed) {
+      return;
+    }
+    $this->destroyed = true;
+
+    // Remove this locale from the stack and set the new active locale. Usually,
+    // we're the last item on the stack, so this shortens the stack by one item
+    // and sets the locale underneath. However, it's possible that guards are
+    // being destroyed out of order, so we might just be removing an item
+    // somewhere in the middle of the stack. In this case, we won't actually
+    // change the locale, just set it to its current value again.
+
+    unset(self::$stack[$this->key]);
+    PhabricatorEnv::setLocaleCode(end(self::$stack));
+  }
+
+}

src/infrastructure/internationalization/scope/__tests__/PhabricatorLocaleScopeGuardTestCase.php

@@ -0,0 +1,38 @@
+<?php
+
+final class PhabricatorLocaleScopeGuardTestCase
+  extends PhabricatorTestCase {
+
+  public function testLocaleScopeGuard() {
+    $original = PhabricatorEnv::getLocaleCode();
+
+    // Set a guard; it should change the locale, then revert it when destroyed.
+    $guard = PhabricatorEnv::beginScopedLocale('en_GB');
+    $this->assertEqual('en_GB', PhabricatorEnv::getLocaleCode());
+    unset($guard);
+    $this->assertEqual($original, PhabricatorEnv::getLocaleCode());
+
+    // Nest guards, then destroy them out of order.
+    $guard1 = PhabricatorEnv::beginScopedLocale('en_GB');
+    $this->assertEqual('en_GB', PhabricatorEnv::getLocaleCode());
+    $guard2 = PhabricatorEnv::beginScopedLocale('en_A*');
+    $this->assertEqual('en_A*', PhabricatorEnv::getLocaleCode());
+    unset($guard1);
+    $this->assertEqual('en_A*', PhabricatorEnv::getLocaleCode());
+    unset($guard2);
+    $this->assertEqual($original, PhabricatorEnv::getLocaleCode());
+
+    // If you push `null`, that should mean "the default locale", not
+    // "the current locale".
+    $guard3 = PhabricatorEnv::beginScopedLocale('en_GB');
+    $this->assertEqual('en_GB', PhabricatorEnv::getLocaleCode());
+    $guard4 = PhabricatorEnv::beginScopedLocale(null);
+    $this->assertEqual($original, PhabricatorEnv::getLocaleCode());
+    unset($guard4);
+    $this->assertEqual('en_GB', PhabricatorEnv::getLocaleCode());
+    unset($guard3);
+    $this->assertEqual($original, PhabricatorEnv::getLocaleCode());
+
+  }
+
+}