Remove dot/Graphviz Remarkup rule

Summary: Ref T9408. This rule is unsafe in principle, and a practical vulnerability has been found by a security researcher.

Test Plan: `grep`

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9408

Differential Revision: https://secure.phabricator.com/D14103

src/__phutil_library_map__.php

···
     'PhabricatorRemarkupCustomBlockRule' => 'infrastructure/markup/rule/PhabricatorRemarkupCustomBlockRule.php',
     'PhabricatorRemarkupCustomInlineRule' => 'infrastructure/markup/rule/PhabricatorRemarkupCustomInlineRule.php',
     'PhabricatorRemarkupFigletBlockInterpreter' => 'infrastructure/markup/interpreter/PhabricatorRemarkupFigletBlockInterpreter.php',
-    'PhabricatorRemarkupGraphvizBlockInterpreter' => 'infrastructure/markup/interpreter/PhabricatorRemarkupGraphvizBlockInterpreter.php',
     'PhabricatorRemarkupUIExample' => 'applications/uiexample/examples/PhabricatorRemarkupUIExample.php',
     'PhabricatorRepositoriesSetupCheck' => 'applications/config/check/PhabricatorRepositoriesSetupCheck.php',
     'PhabricatorRepository' => 'applications/repository/storage/PhabricatorRepository.php',
···
     'PhabricatorRemarkupCustomBlockRule' => 'PhutilRemarkupBlockRule',
     'PhabricatorRemarkupCustomInlineRule' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupFigletBlockInterpreter' => 'PhutilRemarkupBlockInterpreter',
-    'PhabricatorRemarkupGraphvizBlockInterpreter' => 'PhutilRemarkupBlockInterpreter',
     'PhabricatorRemarkupUIExample' => 'PhabricatorUIExample',
     'PhabricatorRepositoriesSetupCheck' => 'PhabricatorSetupCheck',
     'PhabricatorRepository' => array(

src/infrastructure/markup/interpreter/PhabricatorRemarkupGraphvizBlockInterpreter.php

···
-<?php
-
-final class PhabricatorRemarkupGraphvizBlockInterpreter
-  extends PhutilRemarkupBlockInterpreter {
-
-  public function getInterpreterName() {
-    return 'dot';
-  }
-
-  public function markupContent($content, array $argv) {
-    if (!Filesystem::binaryExists('dot')) {
-      return $this->markupError(
-        pht(
-          'Unable to locate the `%s` binary. Install Graphviz.',
-          'dot'));
-    }
-
-    $width = $this->parseDimension(idx($argv, 'width'));
-
-    $future = id(new ExecFuture('dot -T%s', 'png'))
-      ->setTimeout(15)
-      ->write(trim($content));
-
-    list($err, $stdout, $stderr) = $future->resolve();
-
-    if ($err) {
-      return $this->markupError(
-        pht(
-          'Execution of `%s` failed (#%d), check your syntax: %s',
-          'dot',
-          $err,
-          $stderr));
-    }
-
-    $file = PhabricatorFile::buildFromFileDataOrHash(
-      $stdout,
-      array(
-        'name' => 'graphviz.png',
-      ));
-
-    if ($this->getEngine()->isTextMode()) {
-      return '<'.$file->getBestURI().'>';
-    }
-
-    $img = phutil_tag(
-      'img',
-      array(
-        'src' => $file->getBestURI(),
-        'width' => nonempty($width, null),
-      ));
-    return phutil_tag_div('phabricator-remarkup-embed-image-full', $img);
-  }
-
-  // TODO: This is duplicated from PhabricatorEmbedFileRemarkupRule since they
-  // do not share a base class.
-  private function parseDimension($string) {
-    $string = trim($string);
-
-    if (preg_match('/^(?:\d*\\.)?\d+%?$/', $string)) {
-      return $string;
-    }
-
-    return null;
-  }
-}