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web/core/tests/Drupal/Tests/BrowserHtmlDebugTrait.php

@@ -0,0 +1,222 @@
+<?php
+
+namespace Drupal\Tests;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Utility\Error;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Provides the debug functions for browser tests.
+ */
+trait BrowserHtmlDebugTrait {
+
+  /**
+   * Class name for HTML output logging.
+   *
+   * @var string
+   */
+  protected $htmlOutputClassName;
+
+  /**
+   * Directory name for HTML output logging.
+   *
+   * @var string
+   */
+  protected $htmlOutputDirectory;
+
+  /**
+   * Counter storage for HTML output logging.
+   *
+   * @var string
+   */
+  protected $htmlOutputCounterStorage;
+
+  /**
+   * Counter for HTML output logging.
+   *
+   * @var int
+   */
+  protected $htmlOutputCounter = 1;
+
+  /**
+   * HTML output output enabled.
+   *
+   * @var bool
+   */
+  protected $htmlOutputEnabled = FALSE;
+
+  /**
+   * The file name to write the list of URLs to.
+   *
+   * This file is read by the PHPUnit result printer.
+   *
+   * @var string
+   *
+   * @see \Drupal\Tests\Listeners\HtmlOutputPrinter
+   */
+  protected $htmlOutputFile;
+
+  /**
+   * HTML output test ID.
+   *
+   * @var int
+   */
+  protected $htmlOutputTestId;
+
+  /**
+   * Formats HTTP headers as string for HTML output logging.
+   *
+   * @param array[] $headers
+   *   Headers that should be formatted.
+   *
+   * @return string
+   *   The formatted HTML string.
+   */
+  protected function formatHtmlOutputHeaders(array $headers) {
+    $flattened_headers = array_map(function ($header) {
+      if (is_array($header)) {
+        return implode(';', array_map('trim', $header));
+      }
+      else {
+        return $header;
+      }
+    }, $headers);
+    return '<hr />Headers: <pre>' . Html::escape(var_export($flattened_headers, TRUE)) . '</pre>';
+  }
+
+  /**
+   * Returns headers in HTML output format.
+   *
+   * @return string
+   *   HTML output headers.
+   */
+  protected function getHtmlOutputHeaders() {
+    return $this->formatHtmlOutputHeaders($this->getSession()->getResponseHeaders());
+  }
+
+  /**
+   * Logs a HTML output message in a text file.
+   *
+   * The link to the HTML output message will be printed by the results printer.
+   *
+   * @param string|null $message
+   *   (optional) The HTML output message to be stored. If not supplied the
+   *   current page content is used.
+   *
+   * @see \Drupal\Tests\Listeners\VerbosePrinter::printResult()
+   */
+  protected function htmlOutput($message = NULL) {
+    if (!$this->htmlOutputEnabled) {
+      return;
+    }
+    $message = $message ?: $this->getSession()->getPage()->getContent();
+    $message = '<hr />ID #' . $this->htmlOutputCounter . ' (<a href="' . $this->htmlOutputClassName . '-' . ($this->htmlOutputCounter - 1) . '-' . $this->htmlOutputTestId . '.html">Previous</a> | <a href="' . $this->htmlOutputClassName . '-' . ($this->htmlOutputCounter + 1) . '-' . $this->htmlOutputTestId . '.html">Next</a>)<hr />' . $message;
+    $html_output_filename = $this->htmlOutputClassName . '-' . $this->htmlOutputCounter . '-' . $this->htmlOutputTestId . '.html';
+    file_put_contents($this->htmlOutputDirectory . '/' . $html_output_filename, $message);
+    file_put_contents($this->htmlOutputCounterStorage, $this->htmlOutputCounter++);
+    // Do not use file_create_url() as the module_handler service might not be
+    // available.
+    $uri = $GLOBALS['base_url'] . '/sites/simpletest/browser_output/' . $html_output_filename;
+    file_put_contents($this->htmlOutputFile, $uri . "\n", FILE_APPEND);
+  }
+
+  /**
+   * Creates the directory to store browser output.
+   *
+   * Creates the directory to store browser output in if a file to write
+   * URLs to has been created by \Drupal\Tests\Listeners\HtmlOutputPrinter.
+   */
+  protected function initBrowserOutputFile() {
+    $browser_output_file = getenv('BROWSERTEST_OUTPUT_FILE');
+    $this->htmlOutputEnabled = is_file($browser_output_file);
+    if ($this->htmlOutputEnabled) {
+      $this->htmlOutputFile = $browser_output_file;
+      $this->htmlOutputClassName = str_replace("\\", "_", get_called_class());
+      $this->htmlOutputDirectory = DRUPAL_ROOT . '/sites/simpletest/browser_output';
+      // Do not use the file_system service so this method can be called before
+      // it is available.
+      if (!is_dir($this->htmlOutputDirectory)) {
+        mkdir($this->htmlOutputDirectory, 0775, TRUE);
+      }
+      if (!file_exists($this->htmlOutputDirectory . '/.htaccess')) {
+        file_put_contents($this->htmlOutputDirectory . '/.htaccess', "<IfModule mod_expires.c>\nExpiresActive Off\n</IfModule>\n");
+      }
+      $this->htmlOutputCounterStorage = $this->htmlOutputDirectory . '/' . $this->htmlOutputClassName . '.counter';
+      $this->htmlOutputTestId = str_replace('sites/simpletest/', '', $this->siteDirectory);
+      if (is_file($this->htmlOutputCounterStorage)) {
+        $this->htmlOutputCounter = max(1, (int) file_get_contents($this->htmlOutputCounterStorage)) + 1;
+      }
+    }
+  }
+
+  /**
+   * Provides a Guzzle middleware handler to log every response received.
+   *
+   * @return callable
+   *   The callable handler that will do the logging.
+   */
+  protected function getResponseLogHandler() {
+    return function (callable $handler) {
+      return function (RequestInterface $request, array $options) use ($handler) {
+        return $handler($request, $options)
+          ->then(function (ResponseInterface $response) use ($request) {
+            if ($this->htmlOutputEnabled) {
+
+              $caller = $this->getTestMethodCaller();
+              $html_output = 'Called from ' . $caller['function'] . ' line ' . $caller['line'];
+              $html_output .= '<hr />' . $request->getMethod() . ' request to: ' . $request->getUri();
+
+              // On redirect responses (status code starting with '3') we need
+              // to remove the meta tag that would do a browser refresh. We
+              // don't want to redirect developers away when they look at the
+              // debug output file in their browser.
+              $body = $response->getBody();
+              $status_code = (string) $response->getStatusCode();
+              if ($status_code[0] === '3') {
+                $body = preg_replace('#<meta http-equiv="refresh" content=.+/>#', '', $body, 1);
+              }
+              $html_output .= '<hr />' . $body;
+              $html_output .= $this->formatHtmlOutputHeaders($response->getHeaders());
+
+              $this->htmlOutput($html_output);
+            }
+            return $response;
+          });
+      };
+    };
+  }
+
+  /**
+   * Retrieves the current calling line in the class under test.
+   *
+   * @return array
+   *   An associative array with keys 'file', 'line' and 'function'.
+   */
+  protected function getTestMethodCaller() {
+    $backtrace = debug_backtrace();
+    // Find the test class that has the test method.
+    while ($caller = Error::getLastCaller($backtrace)) {
+      if (isset($caller['class']) && $caller['class'] === get_class($this)) {
+        break;
+      }
+      // If the test method is implemented by a test class's parent then the
+      // class name of $this will not be part of the backtrace.
+      // In that case we process the backtrace until the caller is not a
+      // subclass of $this and return the previous caller.
+      if (isset($last_caller) && (!isset($caller['class']) || !is_subclass_of($this, $caller['class']))) {
+        // Return the last caller since that has to be the test class.
+        $caller = $last_caller;
+        break;
+      }
+      // Otherwise we have not reached our test class yet: save the last caller
+      // and remove an element from to backtrace to process the next call.
+      $last_caller = $caller;
+      array_shift($backtrace);
+    }
+
+    return $caller;
+  }
+
+}