Pull file Document Engine rendering out of "Files" application controllers

Summary:
Ref T13105. This separates document rendering from the Controllers which trigger it so it can be reused elsewhere (notably, in Diffusion).

This shouldn't cause any application behavior to change, it just pulls the rendering logic out so it can be reused elsewhere.

Test Plan: Viewed various types of files in Files; toggled rendering, highlighting, and encoding.

Reviewers: mydeveloperday

Reviewed By: mydeveloperday

Maniphest Tasks: T13105

Differential Revision: https://secure.phabricator.com/D19301

src/__phutil_library_map__.php

@@ -2819,6 +2819,7 @@ phutil_register_library_map(array(
     'PhabricatorDivinerApplication' => 'applications/diviner/application/PhabricatorDivinerApplication.php',
     'PhabricatorDocumentEngine' => 'applications/files/document/PhabricatorDocumentEngine.php',
     'PhabricatorDocumentRef' => 'applications/files/document/PhabricatorDocumentRef.php',
+    'PhabricatorDocumentRenderingEngine' => 'applications/files/document/render/PhabricatorDocumentRenderingEngine.php',
     'PhabricatorDoorkeeperApplication' => 'applications/doorkeeper/application/PhabricatorDoorkeeperApplication.php',
     'PhabricatorDraft' => 'applications/draft/storage/PhabricatorDraft.php',
     'PhabricatorDraftDAO' => 'applications/draft/storage/PhabricatorDraftDAO.php',
@@ -3010,6 +3011,7 @@ phutil_register_library_map(array(
     'PhabricatorFileDeleteController' => 'applications/files/controller/PhabricatorFileDeleteController.php',
     'PhabricatorFileDeleteTransaction' => 'applications/files/xaction/PhabricatorFileDeleteTransaction.php',
     'PhabricatorFileDocumentController' => 'applications/files/controller/PhabricatorFileDocumentController.php',
+    'PhabricatorFileDocumentRenderingEngine' => 'applications/files/document/render/PhabricatorFileDocumentRenderingEngine.php',
     'PhabricatorFileDropUploadController' => 'applications/files/controller/PhabricatorFileDropUploadController.php',
     'PhabricatorFileEditController' => 'applications/files/controller/PhabricatorFileEditController.php',
     'PhabricatorFileEditEngine' => 'applications/files/editor/PhabricatorFileEditEngine.php',
@@ -8401,6 +8403,7 @@ phutil_register_library_map(array(
     'PhabricatorDivinerApplication' => 'PhabricatorApplication',
     'PhabricatorDocumentEngine' => 'Phobject',
     'PhabricatorDocumentRef' => 'Phobject',
+    'PhabricatorDocumentRenderingEngine' => 'Phobject',
     'PhabricatorDoorkeeperApplication' => 'PhabricatorApplication',
     'PhabricatorDraft' => 'PhabricatorDraftDAO',
     'PhabricatorDraftDAO' => 'PhabricatorLiskDAO',
@@ -8624,6 +8627,7 @@ phutil_register_library_map(array(
     'PhabricatorFileDeleteController' => 'PhabricatorFileController',
     'PhabricatorFileDeleteTransaction' => 'PhabricatorFileTransactionType',
     'PhabricatorFileDocumentController' => 'PhabricatorFileController',
+    'PhabricatorFileDocumentRenderingEngine' => 'PhabricatorDocumentRenderingEngine',
     'PhabricatorFileDropUploadController' => 'PhabricatorFileController',
     'PhabricatorFileEditController' => 'PhabricatorFileController',
     'PhabricatorFileEditEngine' => 'PhabricatorEditEngine',

src/applications/files/application/PhabricatorFilesApplication.php

@@ -73,7 +73,7 @@ final class PhabricatorFilesApplication extends PhabricatorApplication {
         => 'PhabricatorFileViewController',
       '/file/' => array(
         '(query/(?P<queryKey>[^/]+)/)?' => 'PhabricatorFileListController',
-        'view/(?P<id>[^/]+)/'.
+        'view/(?P<id>[1-9]\d*)/'.
           '(?:(?P<engineKey>[^/]+)/)?'.
           '(?:\$(?P<lines>\d+(?:-\d+)?))?'
           => 'PhabricatorFileViewController',

src/applications/files/controller/PhabricatorFileDocumentController.php

@@ -3,10 +3,6 @@
 final class PhabricatorFileDocumentController
   extends PhabricatorFileController {
 
-  private $file;
-  private $engine;
-  private $ref;
-
   public function shouldAllowPublic() {
     return true;
   }
@@ -26,102 +22,14 @@ final class PhabricatorFileDocumentController
           'This file ("%s") does not exist or could not be loaded.',
           $file_phid));
     }
-    $this->file = $file;
 
     $ref = id(new PhabricatorDocumentRef())
       ->setFile($file);
-    $this->ref = $ref;
 
-    $engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);
-    $engine_key = $request->getURIData('engineKey');
-    if (!isset($engines[$engine_key])) {
-      return $this->newErrorResponse(
-        pht(
-          'The engine ("%s") is unknown, or unable to render this document.',
-          $engine_key));
-    }
-    $engine = $engines[$engine_key];
-    $this->engine = $engine;
-
-    $encode_setting = $request->getStr('encode');
-    if (strlen($encode_setting)) {
-      $engine->setEncodingConfiguration($encode_setting);
-    }
-
-    $highlight_setting = $request->getStr('highlight');
-    if (strlen($highlight_setting)) {
-      $engine->setHighlightingConfiguration($highlight_setting);
-    }
-
-    try {
-      $content = $engine->newDocument($ref);
-    } catch (Exception $ex) {
-      return $this->newErrorResponse($ex->getMessage());
-    }
-
-    return $this->newContentResponse($content);
-  }
-
-  private function newErrorResponse($message) {
-    $container = phutil_tag(
-      'div',
-      array(
-        'class' => 'document-engine-error',
-      ),
-      array(
-        id(new PHUIIconView())
-          ->setIcon('fa-exclamation-triangle red'),
-        ' ',
-        $message,
-      ));
-
-    return $this->newContentResponse($container);
-  }
-
-
-  private function newContentResponse($content) {
-    $viewer = $this->getViewer();
-    $request = $this->getRequest();
-
-    $file = $this->file;
-    $engine = $this->engine;
-    $ref = $this->ref;
-
-    if ($request->isAjax()) {
-      return id(new AphrontAjaxResponse())
-        ->setContent(
-          array(
-            'markup' => hsprintf('%s', $content),
-          ));
-    }
-
-    $crumbs = $this->buildApplicationCrumbs();
-    if ($file) {
-      $crumbs->addTextCrumb($file->getMonogram(), $file->getInfoURI());
-    }
-
-    $label = $engine->getViewAsLabel($ref);
-    if ($label) {
-      $crumbs->addTextCrumb($label);
-    }
-
-    $crumbs->setBorder(true);
-
-    $content_frame = id(new PHUIObjectBoxView())
-      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
-      ->appendChild($content);
-
-    $page_frame = id(new PHUITwoColumnView())
-      ->setFooter($content_frame);
-
-    return $this->newPage()
-      ->setCrumbs($crumbs)
-      ->setTitle(
-        array(
-          $ref->getName(),
-          pht('Standalone'),
-        ))
-      ->appendChild($page_frame);
+    return id(new PhabricatorFileDocumentRenderingEngine())
+      ->setRequest($request)
+      ->setController($this)
+      ->newRenderResponse($ref);
   }
 
 }

src/applications/files/controller/PhabricatorFileViewController.php

@@ -403,122 +403,15 @@ final class PhabricatorFileViewController extends PhabricatorFileController {
   }
 
   private function newFileContent(PhabricatorFile $file) {
-    $viewer = $this->getViewer();
     $request = $this->getRequest();
 
     $ref = id(new PhabricatorDocumentRef())
       ->setFile($file);
 
-    $engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);
+    $engine = id(new PhabricatorFileDocumentRenderingEngine())
+      ->setRequest($request);
 
-    $engine_key = $request->getURIData('engineKey');
-    if (!isset($engines[$engine_key])) {
-      $engine_key = head_key($engines);
-    }
-    $engine = $engines[$engine_key];
-
-    $lines = $request->getURILineRange('lines', 1000);
-    if ($lines) {
-      $engine->setHighlightedLines(range($lines[0], $lines[1]));
-    }
-
-    $encode_setting = $request->getStr('encode');
-    if (strlen($encode_setting)) {
-      $engine->setEncodingConfiguration($encode_setting);
-    }
-
-    $highlight_setting = $request->getStr('highlight');
-    if (strlen($highlight_setting)) {
-      $engine->setHighlightingConfiguration($highlight_setting);
-    }
-
-    $views = array();
-    foreach ($engines as $candidate_key => $candidate_engine) {
-      $label = $candidate_engine->getViewAsLabel($ref);
-      if ($label === null) {
-        continue;
-      }
-
-      $view_uri = '/file/view/'.$file->getID().'/'.$candidate_key.'/';
-
-      $view_icon = $candidate_engine->getViewAsIconIcon($ref);
-      $view_color = $candidate_engine->getViewAsIconColor($ref);
-      $loading = $candidate_engine->newLoadingContent($ref);
-
-      $views[] = array(
-        'viewKey' => $candidate_engine->getDocumentEngineKey(),
-        'icon' => $view_icon,
-        'color' => $view_color,
-        'name' => $label,
-        'engineURI' => $candidate_engine->getRenderURI($ref),
-        'viewURI' => $view_uri,
-        'loadingMarkup' => hsprintf('%s', $loading),
-        'canEncode' => $candidate_engine->canConfigureEncoding($ref),
-        'canHighlight' => $candidate_engine->CanConfigureHighlighting($ref),
-      );
-    }
-
-    $viewport_id = celerity_generate_unique_node_id();
-    $control_id = celerity_generate_unique_node_id();
-    $icon = $engine->newDocumentIcon($ref);
-
-    if ($engine->shouldRenderAsync($ref)) {
-      $content = $engine->newLoadingContent($ref);
-      $config = array(
-        'renderControlID' => $control_id,
-      );
-    } else {
-      $content = $engine->newDocument($ref);
-      $config = array();
-    }
-
-    Javelin::initBehavior('document-engine', $config);
-
-    $viewport = phutil_tag(
-      'div',
-      array(
-        'id' => $viewport_id,
-      ),
-      $content);
-
-    $meta = array(
-      'viewportID' => $viewport_id,
-      'viewKey' => $engine->getDocumentEngineKey(),
-      'views' => $views,
-      'standaloneURI' => $engine->getRenderURI($ref),
-      'encode' => array(
-        'icon' => 'fa-font',
-        'name' => pht('Change Text Encoding...'),
-        'uri' => '/services/encoding/',
-        'value' => $encode_setting,
-      ),
-      'highlight' => array(
-        'icon' => 'fa-lightbulb-o',
-        'name' => pht('Highlight As...'),
-        'uri' => '/services/highlight/',
-        'value' => $highlight_setting,
-      ),
-    );
-
-    $view_button = id(new PHUIButtonView())
-      ->setTag('a')
-      ->setText(pht('View Options'))
-      ->setIcon('fa-file-image-o')
-      ->setColor(PHUIButtonView::GREY)
-      ->setID($control_id)
-      ->setMetadata($meta)
-      ->setDropdown(true)
-      ->addSigil('document-engine-view-dropdown');
-
-    $header = id(new PHUIHeaderView())
-      ->setHeaderIcon($icon)
-      ->setHeader($ref->getName())
-      ->addActionLink($view_button);
-
-    return id(new PHUIObjectBoxView())
-      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
-      ->setHeader($header)
-      ->appendChild($viewport);
+    return $engine->newDocumentView($ref);
   }
 
 }

src/applications/files/document/PhabricatorDocumentEngine.php

@@ -152,18 +152,6 @@ abstract class PhabricatorDocumentEngine
     return null;
   }
 
-  public function getRenderURI(PhabricatorDocumentRef $ref) {
-    $file = $ref->getFile();
-    if (!$file) {
-      throw new PhutilMethodNotImplementedException();
-    }
-
-    $engine_key = $this->getDocumentEngineKey();
-    $file_phid = $file->getPHID();
-
-    return "/file/document/{$engine_key}/{$file_phid}/";
-  }
-
   final public static function getEnginesForRef(
     PhabricatorUser $viewer,
     PhabricatorDocumentRef $ref) {

src/applications/files/document/render/PhabricatorDocumentRenderingEngine.php

@@ -0,0 +1,285 @@
+<?php
+
+abstract class PhabricatorDocumentRenderingEngine
+  extends Phobject {
+
+  private $request;
+  private $controller;
+  private $activeEngine;
+
+  final public function setRequest(AphrontRequest $request) {
+    $this->request = $request;
+    return $this;
+  }
+
+  final public function getRequest() {
+    if (!$this->request) {
+      throw new PhutilInvalidStateException('setRequest');
+    }
+
+    return $this->request;
+  }
+
+  final public function setController(PhabricatorController $controller) {
+    $this->controller = $controller;
+    return $this;
+  }
+
+  final public function getController() {
+    if (!$this->controller) {
+      throw new PhutilInvalidStateException('setController');
+    }
+
+    return $this->controller;
+  }
+
+  final protected function getActiveEngine() {
+    if (!$this->activeEngine) {
+      throw new PhutilInvalidStateException('setActiveEngine');
+    }
+
+    return $this->activeEngine;
+  }
+
+  final public function newDocumentView(PhabricatorDocumentRef $ref) {
+    $request = $this->getRequest();
+    $viewer = $request->getViewer();
+
+    $engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);
+
+    $engine_key = $this->getSelectedDocumentEngineKey();
+    if (!isset($engines[$engine_key])) {
+      $engine_key = head_key($engines);
+    }
+    $engine = $engines[$engine_key];
+
+    $lines = $request->getURILineRange('lines', 1000);
+    if ($lines) {
+      $engine->setHighlightedLines(range($lines[0], $lines[1]));
+    }
+
+    $encode_setting = $request->getStr('encode');
+    if (strlen($encode_setting)) {
+      $engine->setEncodingConfiguration($encode_setting);
+    }
+
+    $highlight_setting = $request->getStr('highlight');
+    if (strlen($highlight_setting)) {
+      $engine->setHighlightingConfiguration($highlight_setting);
+    }
+
+    $views = array();
+    foreach ($engines as $candidate_key => $candidate_engine) {
+      $label = $candidate_engine->getViewAsLabel($ref);
+      if ($label === null) {
+        continue;
+      }
+
+      $view_uri = $this->newRefViewURI($ref, $candidate_engine);
+
+      $view_icon = $candidate_engine->getViewAsIconIcon($ref);
+      $view_color = $candidate_engine->getViewAsIconColor($ref);
+      $loading = $candidate_engine->newLoadingContent($ref);
+
+      $views[] = array(
+        'viewKey' => $candidate_engine->getDocumentEngineKey(),
+        'icon' => $view_icon,
+        'color' => $view_color,
+        'name' => $label,
+        'engineURI' => $this->newRefRenderURI($ref, $candidate_engine),
+        'viewURI' => $view_uri,
+        'loadingMarkup' => hsprintf('%s', $loading),
+        'canEncode' => $candidate_engine->canConfigureEncoding($ref),
+        'canHighlight' => $candidate_engine->CanConfigureHighlighting($ref),
+      );
+    }
+
+    $viewport_id = celerity_generate_unique_node_id();
+    $control_id = celerity_generate_unique_node_id();
+    $icon = $engine->newDocumentIcon($ref);
+
+    if ($engine->shouldRenderAsync($ref)) {
+      $content = $engine->newLoadingContent($ref);
+      $config = array(
+        'renderControlID' => $control_id,
+      );
+    } else {
+      $content = $engine->newDocument($ref);
+      $config = array();
+    }
+
+    Javelin::initBehavior('document-engine', $config);
+
+    $viewport = phutil_tag(
+      'div',
+      array(
+        'id' => $viewport_id,
+      ),
+      $content);
+
+    $meta = array(
+      'viewportID' => $viewport_id,
+      'viewKey' => $engine->getDocumentEngineKey(),
+      'views' => $views,
+      'encode' => array(
+        'icon' => 'fa-font',
+        'name' => pht('Change Text Encoding...'),
+        'uri' => '/services/encoding/',
+        'value' => $encode_setting,
+      ),
+      'highlight' => array(
+        'icon' => 'fa-lightbulb-o',
+        'name' => pht('Highlight As...'),
+        'uri' => '/services/highlight/',
+        'value' => $highlight_setting,
+      ),
+    );
+
+    $view_button = id(new PHUIButtonView())
+      ->setTag('a')
+      ->setText(pht('View Options'))
+      ->setIcon('fa-file-image-o')
+      ->setColor(PHUIButtonView::GREY)
+      ->setID($control_id)
+      ->setMetadata($meta)
+      ->setDropdown(true)
+      ->addSigil('document-engine-view-dropdown');
+
+    $header = id(new PHUIHeaderView())
+      ->setHeaderIcon($icon)
+      ->setHeader($ref->getName())
+      ->addActionLink($view_button);
+
+    return id(new PHUIObjectBoxView())
+      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
+      ->setHeader($header)
+      ->appendChild($viewport);
+  }
+
+  abstract protected function newRefViewURI(
+    PhabricatorDocumentRef $ref,
+    PhabricatorDocumentEngine $engine);
+
+  abstract protected function newRefRenderURI(
+    PhabricatorDocumentRef $ref,
+    PhabricatorDocumentEngine $engine);
+
+  protected function getSelectedDocumentEngineKey() {
+    return $this->getRequest()->getURIData('engineKey');
+  }
+
+  final public function newRenderResponse(PhabricatorDocumentRef $ref) {
+    $request = $this->getRequest();
+    $viewer = $request->getViewer();
+
+    $engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);
+    $engine_key = $request->getURIData('engineKey');
+    if (!isset($engines[$engine_key])) {
+      return $this->newErrorResponse(
+        $ref,
+        pht(
+          'The engine ("%s") is unknown, or unable to render this document.',
+          $engine_key));
+    }
+    $engine = $engines[$engine_key];
+
+    $this->activeEngine = $engine;
+
+    $encode_setting = $request->getStr('encode');
+    if (strlen($encode_setting)) {
+      $engine->setEncodingConfiguration($encode_setting);
+    }
+
+    $highlight_setting = $request->getStr('highlight');
+    if (strlen($highlight_setting)) {
+      $engine->setHighlightingConfiguration($highlight_setting);
+    }
+
+    try {
+      $content = $engine->newDocument($ref);
+    } catch (Exception $ex) {
+      return $this->newErrorResponse($ref, $ex->getMessage());
+    }
+
+    return $this->newContentResponse($ref, $content);
+  }
+
+  private function newErrorResponse(
+    PhabricatorDocumentRef $ref,
+    $message) {
+
+    $container = phutil_tag(
+      'div',
+      array(
+        'class' => 'document-engine-error',
+      ),
+      array(
+        id(new PHUIIconView())
+          ->setIcon('fa-exclamation-triangle red'),
+        ' ',
+        $message,
+      ));
+
+    return $this->newContentResponse($ref, $container);
+  }
+
+  private function newContentResponse(
+    PhabricatorDocumentRef $ref,
+    $content) {
+
+    $request = $this->getRequest();
+    $viewer = $request->getViewer();
+    $controller = $this->getController();
+
+    if ($request->isAjax()) {
+      return id(new AphrontAjaxResponse())
+        ->setContent(
+          array(
+            'markup' => hsprintf('%s', $content),
+          ));
+    }
+
+    $crumbs = $this->newCrumbs($ref);
+    if ($crumbs) {
+      $crumbs->setBorder(true);
+    }
+
+    $content_frame = id(new PHUIObjectBoxView())
+      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
+      ->appendChild($content);
+
+    $page_frame = id(new PHUITwoColumnView())
+      ->setFooter($content_frame);
+
+    return $controller->newPage()
+      ->setCrumbs($crumbs)
+      ->setTitle(
+        array(
+          $ref->getName(),
+          pht('Standalone'),
+        ))
+      ->appendChild($page_frame);
+  }
+
+  protected function newCrumbs(PhabricatorDocumentRef $ref) {
+    $controller = $this->getController();
+    $crumbs = $controller->buildApplicationCrumbsForEditEngine();
+
+    $this->addApplicationCrumbs($ref, $crumbs);
+
+    $engine = $this->getActiveEngine();
+    $label = $engine->getViewAsLabel($ref);
+    if ($label) {
+      $crumbs->addTextCrumb($label);
+    }
+
+    return $crumbs;
+  }
+
+  protected function addApplicationCrumbs(
+    PhabricatorDocumentRef $ref,
+    PHUICrumbsView $crumbs) {
+    return;
+  }
+
+}

src/applications/files/document/render/PhabricatorFileDocumentRenderingEngine.php

@@ -0,0 +1,47 @@
+<?php
+
+final class PhabricatorFileDocumentRenderingEngine
+  extends PhabricatorDocumentRenderingEngine {
+
+  protected function newRefViewURI(
+    PhabricatorDocumentRef $ref,
+    PhabricatorDocumentEngine $engine) {
+
+    $file = $ref->getFile();
+    $engine_key = $engine->getDocumentEngineKey();
+
+    return urisprintf(
+      '/file/view/%d/%s/',
+      $file->getID(),
+      $engine_key);
+  }
+
+  protected function newRefRenderURI(
+    PhabricatorDocumentRef $ref,
+    PhabricatorDocumentEngine $engine) {
+    $file = $ref->getFile();
+    if (!$file) {
+      throw new PhutilMethodNotImplementedException();
+    }
+
+    $engine_key = $engine->getDocumentEngineKey();
+    $file_phid = $file->getPHID();
+
+    return urisprintf(
+      '/file/document/%s/%s/',
+      $engine_key,
+      $file_phid);
+  }
+
+  protected function addApplicationCrumbs(
+    PhabricatorDocumentRef $ref,
+    PHUICrumbsView $crumbs) {
+
+    $file = $ref->getFile();
+    if ($file) {
+      $crumbs->addTextCrumb($file->getMonogram(), $file->getInfoURI());
+    }
+
+  }
+
+}