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Filename : ErrorHandler.php
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Holds class PMA\libraries\ErrorHandler
 *
 * @package PhpMyAdmin
 */
namespace PMA\libraries;

use PMA\libraries\Error;

/**
 * handling errors
 *
 * @package PhpMyAdmin
 */
class ErrorHandler
{
    /**
     * holds errors to be displayed or reported later ...
     *
     * @var Error[]
     */
    protected $errors = array();

    /**
     * Hide location of errors
     */
    protected $hide_location = false;

    /**
     * Initial error reporting state
     */
    protected $error_reporting = 0;

    /**
     * Constructor - set PHP error handler
     *
     */
    public function __construct()
    {
        /**
         * Do not set ourselves as error handler in case of testsuite.
         *
         * This behavior is not tested there and breaks other tests as they
         * rely on PHPUnit doing it's own error handling which we break here.
         */
        if (!defined('TESTSUITE')) {
            set_error_handler(array($this, 'handleError'));
        }
        $this->error_reporting = error_reporting();
    }

    /**
     * Destructor
     *
     * stores errors in session
     *
     */
    public function __destruct()
    {
        if (isset($_SESSION)) {
            if (! isset($_SESSION['errors'])) {
                $_SESSION['errors'] = array();
            }

            // remember only not displayed errors
            foreach ($this->errors as $key => $error) {
                /**
                 * We don't want to store all errors here as it would
                 * explode user session.
                 */
                if (count($_SESSION['errors']) >= 10) {
                    $error = new Error(
                        0,
                        __('Too many error messages, some are not displayed.'),
                        __FILE__,
                        __LINE__
                    );
                    $_SESSION['errors'][$error->getHash()] = $error;
                    break;
                } else if (($error instanceof Error)
                    && ! $error->isDisplayed()
                ) {
                    $_SESSION['errors'][$key] = $error;
                }
            }
        }
    }

    /**
     * Toggles location hiding
     *
     * @param boolean $hide Whether to hide
     *
     * @return void
     */
    public function setHideLocation($hide)
    {
        $this->hide_location = $hide;
    }

    /**
     * returns array with all errors
     *
     * @param bool $check Whether to check for session errors
     *
     * @return Error[]
     */
    public function getErrors($check=true)
    {
        if ($check) {
            $this->checkSavedErrors();
        }
        return $this->errors;
    }

    /**
    * returns the errors occurred in the current run only.
    * Does not include the errors saved in the SESSION
    *
    * @return Error[]
    */
    public function getCurrentErrors()
    {
        return $this->errors;
    }

    /**
     * Pops recent errors from the storage
     *
     * @param int $count Old error count
     *
     * @return Error[]
     */
    public function sliceErrors($count)
    {
        $errors = $this->getErrors(false);
        $this->errors = array_splice($errors, 0, $count);
        return array_splice($errors, $count);
    }

    /**
     * Error handler - called when errors are triggered/occurred
     *
     * This calls the addError() function, escaping the error string
     * Ignores the errors wherever Error Control Operator (@) is used.
     *
     * @param integer $errno   error number
     * @param string  $errstr  error string
     * @param string  $errfile error file
     * @param integer $errline error line
     *
     * @return void
     */
    public function handleError($errno, $errstr, $errfile, $errline)
    {
        /**
         * Check if Error Control Operator (@) was used, but still show
         * user errors even in this case.
         */
        if (error_reporting() == 0 &&
            $this->error_reporting != 0 &&
            ($errno & (E_USER_WARNING | E_USER_ERROR | E_USER_NOTICE)) == 0
        ) {
            return;
        }
        $this->addError($errstr, $errno, $errfile, $errline, true);
    }

    /**
     * Add an error; can also be called directly (with or without escaping)
     *
     * The following error types cannot be handled with a user defined function:
     * E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR,
     * E_COMPILE_WARNING,
     * and most of E_STRICT raised in the file where set_error_handler() is called.
     *
     * Do not use the context parameter as we want to avoid storing the
     * complete $GLOBALS inside $_SESSION['errors']
     *
     * @param string  $errstr  error string
     * @param integer $errno   error number
     * @param string  $errfile error file
     * @param integer $errline error line
     * @param boolean $escape  whether to escape the error string
     *
     * @return void
     */
    public function addError($errstr, $errno, $errfile, $errline, $escape = true)
    {
        if ($escape) {
            $errstr = htmlspecialchars($errstr);
        }
        // create error object
        $error = new Error(
            $errno,
            $errstr,
            $errfile,
            $errline
        );
        $error->setHideLocation($this->hide_location);

        // do not repeat errors
        $this->errors[$error->getHash()] = $error;

        switch ($error->getNumber()) {
        case E_STRICT:
        case E_DEPRECATED:
        case E_NOTICE:
        case E_WARNING:
        case E_CORE_WARNING:
        case E_COMPILE_WARNING:
        case E_RECOVERABLE_ERROR:
            /* Avoid rendering BB code in PHP errors */
            $error->setBBCode(false);
            break;
        case E_USER_NOTICE:
        case E_USER_WARNING:
        case E_USER_ERROR:
            // just collect the error
            // display is called from outside
            break;
        case E_ERROR:
        case E_PARSE:
        case E_CORE_ERROR:
        case E_COMPILE_ERROR:
        default:
            // FATAL error, display it and exit
            $this->dispFatalError($error);
            exit;
        }
    }

    /**
     * trigger a custom error
     *
     * @param string  $errorInfo   error message
     * @param integer $errorNumber error number
     *
     * @return void
     */
    public function triggerError($errorInfo, $errorNumber = null)
    {
        // we could also extract file and line from backtrace
        // and call handleError() directly
        trigger_error($errorInfo, $errorNumber);
    }

    /**
     * display fatal error and exit
     *
     * @param Error $error the error
     *
     * @return void
     */
    protected function dispFatalError($error)
    {
        if (! headers_sent()) {
            $this->dispPageStart($error);
        }
        $error->display();
        $this->dispPageEnd();
        exit;
    }

    /**
     * Displays user errors not displayed
     *
     * @return void
     */
    public function dispUserErrors()
    {
        echo $this->getDispUserErrors();
    }

    /**
     * Renders user errors not displayed
     *
     * @return string
     */
    public function getDispUserErrors()
    {
        $retval = '';
        foreach ($this->getErrors() as $error) {
            if ($error->isUserError() && ! $error->isDisplayed()) {
                $retval .= $error->getDisplay();
            }
        }
        return $retval;
    }

    /**
     * display HTML header
     *
     * @param Error $error the error
     *
     * @return void
     */
    protected function dispPageStart($error = null)
    {
        Response::getInstance()->disable();
        echo '<html><head><title>';
        if ($error) {
            echo $error->getTitle();
        } else {
            echo 'phpMyAdmin error reporting page';
        }
        echo '</title></head>';
    }

    /**
     * display HTML footer
     *
     * @return void
     */
    protected function dispPageEnd()
    {
        echo '</body></html>';
    }

    /**
     * renders errors not displayed
     *
     * @return string
     */
    public function getDispErrors()
    {
        $retval = '';
        // display errors if SendErrorReports is set to 'ask'.
        if ($GLOBALS['cfg']['SendErrorReports'] != 'never') {
            foreach ($this->getErrors() as $error) {
                if (! $error->isDisplayed()) {
                    $retval .= $error->getDisplay();
                }
            }
        } else {
            $retval .= $this->getDispUserErrors();
        }
        // if preference is not 'never' and
        // there are 'actual' errors to be reported
        if ($GLOBALS['cfg']['SendErrorReports'] != 'never'
            &&  $this->countErrors() !=  $this->countUserErrors()
        ) {
            // add report button.
            $retval .= '<form method="post" action="error_report.php"'
                    . ' id="pma_report_errors_form"';
            if ($GLOBALS['cfg']['SendErrorReports'] == 'always') {
                // in case of 'always', generate 'invisible' form.
                $retval .= ' style="display:none;"';
            }
            $retval .=  '>'
                    . '<input type="hidden" name="token" value="'
                    . $_SESSION[' PMA_token ']
                    . '"/>'
                    . '<input type="hidden" name="exception_type" value="php"/>'
                    . '<input type="hidden" name="send_error_report" value="1" />'
                    . '<input type="submit" value="'
                    . __('Report')
                    . '" id="pma_report_errors" class="floatright">'
                    . '<input type="checkbox" name="always_send"'
                    . ' id="always_send_checkbox" value="true"/>'
                    . '<label for="always_send_checkbox">'
                    . __('Automatically send report next time')
                    . '</label>';

            if ($GLOBALS['cfg']['SendErrorReports'] == 'ask') {
                // add ignore buttons
                $retval .= '<input type="submit" value="'
                        . __('Ignore')
                        . '" id="pma_ignore_errors_bottom" class="floatright">';
            }
            $retval .= '<input type="submit" value="'
                    . __('Ignore All')
                    . '" id="pma_ignore_all_errors_bottom" class="floatright">';
            $retval .= '</form>';
        }
        return $retval;
    }

    /**
     * displays errors not displayed
     *
     * @return void
     */
    public function dispErrors()
    {
        echo $this->getDispErrors();
    }

    /**
     * look in session for saved errors
     *
     * @return void
     */
    protected function checkSavedErrors()
    {
        if (isset($_SESSION['errors'])) {

            // restore saved errors
            foreach ($_SESSION['errors'] as $hash => $error) {
                if ($error instanceof Error && ! isset($this->errors[$hash])) {
                    $this->errors[$hash] = $error;
                }
            }

            // delete stored errors
            $_SESSION['errors'] = array();
            unset($_SESSION['errors']);
        }
    }

    /**
     * return count of errors
     *
     * @param bool $check Whether to check for session errors
     *
     * @return integer number of errors occurred
     */
    public function countErrors($check=true)
    {
        return count($this->getErrors($check));
    }

    /**
     * return count of user errors
     *
     * @return integer number of user errors occurred
     */
    public function countUserErrors()
    {
        $count = 0;
        if ($this->countErrors()) {
            foreach ($this->getErrors() as $error) {
                if ($error->isUserError()) {
                    $count++;
                }
            }
        }

        return $count;
    }

    /**
     * whether use errors occurred or not
     *
     * @return boolean
     */
    public function hasUserErrors()
    {
        return (bool) $this->countUserErrors();
    }

    /**
     * whether errors occurred or not
     *
     * @return boolean
     */
    public function hasErrors()
    {
        return (bool) $this->countErrors();
    }

    /**
     * number of errors to be displayed
     *
     * @return integer number of errors to be displayed
     */
    public function countDisplayErrors()
    {
        if ($GLOBALS['cfg']['SendErrorReports'] != 'never') {
            return $this->countErrors();
        } else {
            return $this->countUserErrors();
        }
    }

    /**
     * whether there are errors to display or not
     *
     * @return boolean
     */
    public function hasDisplayErrors()
    {
        return (bool) $this->countDisplayErrors();
    }

    /**
    * Deletes previously stored errors in SESSION.
    * Saves current errors in session as previous errors.
    * Required to save current errors in case  'ask'
    *
    * @return void
    */
    public function savePreviousErrors()
    {
        unset($_SESSION['prev_errors']);
        $_SESSION['prev_errors'] = $GLOBALS['error_handler']->getCurrentErrors();
    }

    /**
     * Function to check if there are any errors to be prompted.
     * Needed because user warnings raised are
     *      also collected by global error handler.
     * This distinguishes between the actual errors
     *      and user errors raised to warn user.
     *
     *@return boolean true if there are errors to be "prompted", false otherwise
     */
    public function hasErrorsForPrompt()
    {
        return (
            $GLOBALS['cfg']['SendErrorReports'] != 'never'
            && $this->countErrors() !=  $this->countUserErrors()
        );
    }

    /**
     * Function to report all the collected php errors.
     * Must be called at the end of each script
     *      by the $GLOBALS['error_handler'] only.
     *
     * @return void
     */
    public function reportErrors()
    {
        // if there're no actual errors,
        if (!$this->hasErrors()
            || $this->countErrors() ==  $this->countUserErrors()
        ) {
            // then simply return.
            return;
        }
        // Delete all the prev_errors in session & store new prev_errors in session
        $this->savePreviousErrors();
        $response = Response::getInstance();
        $jsCode = '';
        if ($GLOBALS['cfg']['SendErrorReports'] == 'always') {
            if ($response->isAjax()) {
                // set flag for automatic report submission.
                $response->addJSON('_sendErrorAlways', '1');
            } else {
                // send the error reports asynchronously & without asking user
                $jsCode .= '$("#pma_report_errors_form").submit();'
                        . 'PMA_ajaxShowMessage(
                            PMA_messages["phpErrorsBeingSubmitted"], false
                        );';
                // js code to appropriate focusing,
                $jsCode .= '$("html, body").animate({
                                scrollTop:$(document).height()
                            }, "slow");';
            }
        } elseif ($GLOBALS['cfg']['SendErrorReports'] == 'ask') {
            //ask user whether to submit errors or not.
            if (!$response->isAjax()) {
                // js code to show appropriate msgs, event binding & focusing.
                $jsCode = 'PMA_ajaxShowMessage(PMA_messages["phpErrorsFound"]);'
                        . '$("#pma_ignore_errors_popup").bind("click", function() {
                            PMA_ignorePhpErrors()
                        });'
                        . '$("#pma_ignore_all_errors_popup").bind("click",
                            function() {
                                PMA_ignorePhpErrors(false)
                            });'
                        . '$("#pma_ignore_errors_bottom").bind("click", function(e) {
                            e.preventDefaulut();
                            PMA_ignorePhpErrors()
                        });'
                        . '$("#pma_ignore_all_errors_bottom").bind("click",
                            function(e) {
                                e.preventDefault();
                                PMA_ignorePhpErrors(false)
                            });'
                        . '$("html, body").animate({
                            scrollTop:$(document).height()
                        }, "slow");';
            }
        }
        // The errors are already sent from the response.
        // Just focus on errors division upon load event.
        $response->getFooter()->getScripts()->addCode($jsCode);
    }
}