<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Error reporting functions used to generate and submit error reports
 *
 * @package PhpMyAdmin
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 * The generated file that contains the linenumbers for the js files
 * If you change any of the js files you can run the scripts/line-counts.sh
 */
if (is_readable('js/line_counts.php')) {
    include_once 'js/line_counts.php';
}

/**
 * the url where to submit reports to
 */
define('SUBMISSION_URL', "http://reports.phpmyadmin.net/incidents/create");

/**
 * returns the error report data collected from the current configuration or
 * from the request parameters sent by the error reporting js code.
 *
 * @param boolean $json_encode whether to encode the report as a json string
 *
 * @return Array/String the report
 */
function PMA_getReportData($json_encode = true) {
    $exception = $_REQUEST['exception'];
    $exception["stack"] = PMA_translateStacktrace($exception["stack"]);
    List($uri, $script_name) = PMA_sanitizeUrl($exception["url"]);
    $exception["uri"] = $uri;
    unset($exception["url"]);
    $report = array(
        "exception" => $exception,
        "script_name" => $script_name,
        "pma_version" => PMA_VERSION,
        "browser_name" => PMA_USR_BROWSER_AGENT,
        "browser_version" => PMA_USR_BROWSER_VER,
        "user_os" => PMA_USR_OS,
        "server_software" => $_SERVER['SERVER_SOFTWARE'],
        "user_agent_string" => $_SERVER['HTTP_USER_AGENT'],
        "locale" => $_COOKIE['pma_lang'],
        "configuration_storage" =>
            empty($GLOBALS['cfg']['Servers'][1]['pmadb']) ? "disabled" :
            "enabled",
        "php_version" => phpversion(),
        "microhistory" => $_REQUEST['microhistory'],
    );

    if(!empty($_REQUEST['description'])) {
        $report['steps'] = $_REQUEST['description'];
    }

    if($json_encode) {
        return json_encode($report, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
    } else {
        return $report;
    }
}

/**
 * Sanitize a url to remove the identifiable host name and extract the
 * current scriptname from the url fragment
 *
 * It returns two things in an array. The first is the uri without the
 * hostname and identifying query params. The second is the name of the
 * php script in the url
 *
 * @param String the url to sanitize
 * @return Array the uri and script name
 */
function PMA_sanitizeUrl($url) {
    $components = parse_url($url);
    if (isset($components["fragment"]) && preg_match("<PMAURL-\d+:>",
            $components["fragment"], $matches)) {
        $uri = str_replace($matches[0], "", $components["fragment"]);
        $url = "http://dummy_host/" . $uri;
        $components = parse_url($url);
    }

    // get script name
    preg_match("<([a-zA-Z\-_\d]*\.php)$>", $components["path"], $matches);
    $script_name = $matches[1];

    // remove deployment specific details to make uri more generic
    parse_str($components["query"], $query_array);
    unset($query_array["db"]);
    unset($query_array["table"]);
    unset($query_array["token"]);
    unset($query_array["server"]);
    $query = http_build_query($query_array);

    $uri = $script_name . "?" . $query;
    return array($uri, $script_name);
}

/**
 * Sends report data to the error reporting server
 *
 * @param Array $report the report info to be sent
 *
 * @return String the reply of the server
 */
function PMA_sendErrorReport($report) {
    $data_string = json_encode($report);
    if (ini_get('allow_url_fopen') && false) {
        $context = array("http" =>
            array(
                'method'  => 'POST',
                'content' => $data_string,
            )
        );
        if (strlen($GLOBALS['cfg']['ProxyUrl'])) {
            $context['http'] = array(
                'proxy' => $GLOBALS['cfg']['ProxyUrl'],
                'request_fulluri' => true
            );
            if (strlen($GLOBALS['cfg']['ProxyUser'])) {
                $auth = base64_encode(
                    $GLOBALS['cfg']['ProxyUser'] . ':' . $GLOBALS['cfg']['ProxyPass']
                );
                $context['http']['header'] = 'Proxy-Authorization: Basic ' . $auth;
            }
        }
        $response = file_get_contents(
            SUBMISSION_URL,
            false,
            stream_context_create($context)
        );
    } else if (function_exists('curl_init')) {
        $curl_handle = curl_init(SUBMISSION_URL);
        if (strlen($GLOBALS['cfg']['ProxyUrl'])) {
            curl_setopt($curl_handle, CURLOPT_PROXY, $GLOBALS['cfg']['ProxyUrl']);
            if (strlen($GLOBALS['cfg']['ProxyUser'])) {
                curl_setopt(
                    $curl_handle,
                    CURLOPT_PROXYUSERPWD,
                    $GLOBALS['cfg']['ProxyUser'] . ':' . $GLOBALS['cfg']['ProxyPass']
                );
            }
        }
        curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $data_string);
        curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
        $response = curl_exec($curl_handle);
        curl_close($curl_handle);
    }
    return $response;
}

/**
 * returns the translated linenumber and the file name from the cumulative line
 * number and an array of files
 *
 * uses the $LINE_COUNT global array of file names and line numbers
 *
 * @param Array $filenames list of files in order of concatenation
 * @param Integer $cumulative_number the cumulative line number in the
 *    concatenated files
 *
 * returns two variables in an array:
 * - A String $filename the filename where the requested cumulative number
 *   exists
 * - Integer $linenumber the translated line number in the returned file
 *
 * @return Array the filename and linenumber
 */
function PMA_getLineNumber($filenames, $cumulative_number) {
  global $LINE_COUNT;
  $cumulative_sum = 0;
  foreach($filenames as $filename) {
    $filecount = $LINE_COUNT[$filename];
    if ($cumulative_number <= $cumulative_sum + $filecount + 2) {
      $linenumber = $cumulative_number - $cumulative_sum;
      break;
    }
    $cumulative_sum += $filecount + 2;
  }
  return array($filename, $linenumber);
}

/**
 * translates the cumulative line numbers in the stactrace as well as sanitize
 * urls and trim long lines in the context
 *
 * @param Array $stack the stacktrace
 *
 * @return Array $stack the modified stacktrace
 */
function PMA_translateStacktrace($stack) {
    if(!defined('LINE_COUNTS')) {
        return $stack;
    }

    foreach ($stack as &$level) {
        foreach ($level["context"] as &$line) {
            if (strlen($line) > 80) {
                $line = substr($line, 0, 75) . "//...";
            }
        }
        if(preg_match("<js/get_scripts.js.php\?(.*)>", $level["url"], $matches)) {
            parse_str($matches[1], $vars);
            List($file_name, $line_number) =
                    PMA_getLineNumber($vars["scripts"], $level["line"]);
            $level["filename"] = $file_name;
            $level["line"] = $line_number;
        } else {
            unset($level["context"]);
            List($uri, $script_name) = PMA_sanitizeUrl($level["url"]);
            $level["uri"] = $uri;
            $level["scriptname"] = $script_name;
        }
        unset($level["url"]);
    }
    unset($level);
    return $stack;
}

/**
 * generates the error report form to collect user description and preview the
 * report before being sent
 *
 * @return String the form
 */
function PMA_getErrorReportForm() {
    $html = "";
    $html .= '<form action="error_report.php" method="post" name="report_frm"'
            .' id="report_frm" class="ajax">'
            .'<fieldset style="padding-top:0px">';

    $html .= '<p>'
            . __('Phpmyadmin has encountered an error. We have collected data about'
            .' this error as well as information about relevant configuration'
            .' settings to send to phpmyadmin for processing to help us in'
            .' debugging the problem')
            .'</p>';

    $html .= '<div class="label"><label><p>'
            . __('You may examine the data in the error report:')
            .'</p></label></div>'
            .'<textarea style="height:13em; overflow-y:scroll; width:570px" disabled>'
            .PMA_getReportData()
            .'</textarea>';

    $html .= '<div class="label"><label><p>'
            . __('Please explain the steps that lead to the error:')
            .'</p></label></div>'
            .'<textarea style="height:10em; width:570px" name="description"'
            .'id="report_description"></textarea>';

    $html .= '<input type="checkbox" name="always_send"'
            .' id="always_send_checkbox"/>'
            .'<span>'
            . __('Automatically send report next time')
            .'</span>';

    $html .= '</fieldset>';

    $form_params = array(
        'db'    => $db,
        'table' => $table,
    );

    $html .= PMA_URL_getHiddenInputs($form_params);
    $html .= PMA_getHiddenFields(PMA_getReportData(false));

    $html .= '</form>';

    return $html;
}

/**
 * generates the error report form to collect user description and preview the
 * report before being sent
 *
 * @return String the form
 */
function PMA_hasLatestLineCounts() {
    $line_counts_time = filemtime("js/line_counts.php");
    $js_time = filemtime("js");
    return $line_counts_time >= $js_time;
}