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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * A simple rules engine, that parses and executes the rules in advisory_rules.txt.
 * Adjusted to phpMyAdmin.
 *
 * @package PhpMyAdmin
 */
namespace PMA\libraries;

use \Exception;

require_once 'libraries/advisor.lib.php';

/**
 * Advisor class
 *
 * @package PhpMyAdmin
 */
class Advisor
{
    protected $variables;
    protected $parseResult;
    protected $runResult;

    /**
     * Get variables
     *
     * @return mixed
     */
    public function getVariables()
    {
        return $this->variables;
    }

    /**
     * Set variables
     *
     * @param array $variables Variables
     *
     * @return Advisor
     */
    public function setVariables($variables)
    {
        $this->variables = $variables;

        return $this;
    }

    /**
     * Set a variable and its value
     *
     * @param string|int $variable Variable to set
     * @param mixed      $value    Value to set
     *
     * @return $this
     */
    public function setVariable($variable, $value)
    {
        $this->variables[$variable] = $value;

        return $this;
    }

    /**
     * Get parseResult
     *
     * @return mixed
     */
    public function getParseResult()
    {
        return $this->parseResult;
    }

    /**
     * Set parseResult
     *
     * @param array $parseResult Parse result
     *
     * @return Advisor
     */
    public function setParseResult($parseResult)
    {
        $this->parseResult = $parseResult;

        return $this;
    }

    /**
     * Get runResult
     *
     * @return mixed
     */
    public function getRunResult()
    {
        return $this->runResult;
    }

    /**
     * Set runResult
     *
     * @param array $runResult Run result
     *
     * @return Advisor
     */
    public function setRunResult($runResult)
    {
        $this->runResult = $runResult;

        return $this;
    }

    /**
     * Parses and executes advisor rules
     *
     * @return array with run and parse results
     */
    public function run()
    {
        // HowTo: A simple Advisory system in 3 easy steps.

        // Step 1: Get some variables to evaluate on
        $this->setVariables(
            array_merge(
                $GLOBALS['dbi']->fetchResult('SHOW GLOBAL STATUS', 0, 1),
                $GLOBALS['dbi']->fetchResult('SHOW GLOBAL VARIABLES', 0, 1)
            )
        );

        // Add total memory to variables as well
        include_once 'libraries/sysinfo.lib.php';
        $sysinfo = PMA_getSysInfo();
        $memory  = $sysinfo->memory();
        $this->variables['system_memory']
            = isset($memory['MemTotal']) ? $memory['MemTotal'] : 0;

        // Step 2: Read and parse the list of rules
        $this->setParseResult(static::parseRulesFile());
        // Step 3: Feed the variables to the rules and let them fire. Sets
        // $runResult
        $this->runRules();

        return array(
            'parse' => array('errors' => $this->parseResult['errors']),
            'run'   => $this->runResult
        );
    }

    /**
     * Stores current error in run results.
     *
     * @param string    $description description of an error.
     * @param Exception $exception   exception raised
     *
     * @return void
     */
    public function storeError($description, $exception)
    {
        $this->runResult['errors'][] = $description
            . ' '
            . sprintf(
                __('PHP threw following error: %s'),
                $exception->getMessage()
            );
    }

    /**
     * Executes advisor rules
     *
     * @return boolean
     */
    public function runRules()
    {
        $this->setRunResult(
            array(
                'fired'     => array(),
                'notfired'  => array(),
                'unchecked' => array(),
                'errors'    => array(),
            )
        );

        foreach ($this->parseResult['rules'] as $rule) {
            $this->variables['value'] = 0;
            $precond = true;

            if (isset($rule['precondition'])) {
                try {
                     $precond = $this->ruleExprEvaluate($rule['precondition']);
                } catch (Exception $e) {
                    $this->storeError(
                        sprintf(
                            __('Failed evaluating precondition for rule \'%s\'.'),
                            $rule['name']
                        ),
                        $e
                    );
                    continue;
                }
            }

            if (! $precond) {
                $this->addRule('unchecked', $rule);
            } else {
                try {
                    $value = $this->ruleExprEvaluate($rule['formula']);
                } catch (Exception $e) {
                    $this->storeError(
                        sprintf(
                            __('Failed calculating value for rule \'%s\'.'),
                            $rule['name']
                        ),
                        $e
                    );
                    continue;
                }

                $this->variables['value'] = $value;

                try {
                    if ($this->ruleExprEvaluate($rule['test'])) {
                        $this->addRule('fired', $rule);
                    } else {
                        $this->addRule('notfired', $rule);
                    }
                } catch (Exception $e) {
                    $this->storeError(
                        sprintf(
                            __('Failed running test for rule \'%s\'.'),
                            $rule['name']
                        ),
                        $e
                    );
                }
            }
        }

        return true;
    }

    /**
     * Escapes percent string to be used in format string.
     *
     * @param string $str string to escape
     *
     * @return string
     */
    public static function escapePercent($str)
    {
        return preg_replace('/%( |,|\.|$|\(|\)|<|>)/', '%%\1', $str);
    }

    /**
     * Wrapper function for translating.
     *
     * @param string $str   the string
     * @param string $param the parameters
     *
     * @return string
     */
    public function translate($str, $param = null)
    {
        $string = _gettext(self::escapePercent($str));
        if (! is_null($param)) {
            $params = $this->ruleExprEvaluate('array(' . $param . ')');
        } else {
            $params = array();
        }
        return vsprintf($string, $params);
    }

    /**
     * Splits justification to text and formula.
     *
     * @param array $rule the rule
     *
     * @return string[]
     */
    public static function splitJustification($rule)
    {
        $jst = preg_split('/\s*\|\s*/', $rule['justification'], 2);
        if (count($jst) > 1) {
            return array($jst[0], $jst[1]);
        }
        return array($rule['justification']);
    }

    /**
     * Adds a rule to the result list
     *
     * @param string $type type of rule
     * @param array  $rule rule itself
     *
     * @return void
     */
    public function addRule($type, $rule)
    {
        switch ($type) {
        case 'notfired':
        case 'fired':
            $jst = self::splitJustification($rule);
            if (count($jst) > 1) {
                try {
                    /* Translate */
                    $str = $this->translate($jst[0], $jst[1]);
                } catch (Exception $e) {
                    $this->storeError(
                        sprintf(
                            __('Failed formatting string for rule \'%s\'.'),
                            $rule['name']
                        ),
                        $e
                    );
                    return;
                }

                $rule['justification'] = $str;
            } else {
                $rule['justification'] = $this->translate($rule['justification']);
            }
            $rule['id'] = $rule['name'];
            $rule['name'] = $this->translate($rule['name']);
            $rule['issue'] = $this->translate($rule['issue']);

            // Replaces {server_variable} with 'server_variable'
            // linking to server_variables.php
            $rule['recommendation'] = preg_replace(
                '/\{([a-z_0-9]+)\}/Ui',
                '<a href="server_variables.php' . PMA_URL_getCommon()
                . '&filter=\1">\1</a>',
                $this->translate($rule['recommendation'])
            );

            // Replaces external Links with PMA_linkURL() generated links
            $rule['recommendation'] = preg_replace_callback(
                '#href=("|\')(https?://[^\1]+)\1#i',
                array($this, 'replaceLinkURL'),
                $rule['recommendation']
            );
            break;
        }

        $this->runResult[$type][] = $rule;
    }

    /**
     * Callback for wrapping links with PMA_linkURL
     *
     * @param array $matches List of matched elements form preg_replace_callback
     *
     * @return string Replacement value
     */
    private function replaceLinkURL($matches)
    {
        return 'href="' . PMA_linkURL($matches[2]) . '" target="_blank" rel="noopener noreferrer"';
    }

    /**
     * Callback for evaluating fired() condition.
     *
     * @param array $matches List of matched elements form preg_replace_callback
     *
     * @return string Replacement value
     */
    private function ruleExprEvaluateFired($matches)
    {
        // No list of fired rules
        if (!isset($this->runResult['fired'])) {
            return '0';
        }

        // Did matching rule fire?
        foreach ($this->runResult['fired'] as $rule) {
            if ($rule['id'] == $matches[2]) {
                return '1';
            }
        }

        return '0';
    }

    /**
     * Callback for evaluating variables in expression.
     *
     * @param array $matches List of matched elements form preg_replace_callback
     *
     * @return string Replacement value
     */
    private function ruleExprEvaluateVariable($matches)
    {
        if (! isset($this->variables[$matches[1]])) {
            return $matches[1];
        }
        if (is_numeric($this->variables[$matches[1]])) {
            return $this->variables[$matches[1]];
        } else {
            return '\'' . addslashes($this->variables[$matches[1]]) . '\'';
        }
    }

    /**
     * Runs a code expression, replacing variable names with their respective
     * values
     *
     * @param string $expr expression to evaluate
     *
     * @return integer result of evaluated expression
     *
     * @throws Exception
     */
    public function ruleExprEvaluate($expr)
    {
        // Evaluate fired() conditions
        $expr = preg_replace_callback(
            '/fired\s*\(\s*(\'|")(.*)\1\s*\)/Ui',
            array($this, 'ruleExprEvaluateFired'),
            $expr
        );
        // Evaluate variables
        $expr = preg_replace_callback(
            '/\b(\w+)\b/',
            array($this, 'ruleExprEvaluateVariable'),
            $expr
        );
        $value = 0;
        $err = 0;

        // Actually evaluate the code
        ob_start();
        try {
            eval('$value = ' . $expr . ';');
            $err = ob_get_contents();
        } catch (Exception $e) {
            // In normal operation, there is just output in the buffer,
            // but when running under phpunit, error in eval raises exception
            $err = $e->getMessage();
        }
        ob_end_clean();

        // Error handling
        if ($err) {
            throw new Exception(
                strip_tags($err)
                . '<br />Executed code: $value = ' . htmlspecialchars($expr) . ';'
            );
        }
        return $value;
    }

    /**
     * Reads the rule file into an array, throwing errors messages on syntax
     * errors.
     *
     * @return array with parsed data
     */
    public static function parseRulesFile()
    {
        $filename = 'libraries/advisory_rules.txt';
        $file = file($filename, FILE_IGNORE_NEW_LINES);

        $errors = array();
        $rules = array();
        $lines = array();

        if ($file === FALSE) {
            $errors[] = sprintf(
                __('Error in reading file: The file \'%s\' does not exist or is not readable!'),
                $filename
            );
            return array('rules' => $rules, 'lines' => $lines, 'errors' => $errors);
        }

        $ruleSyntax = array(
            'name', 'formula', 'test', 'issue', 'recommendation', 'justification'
        );
        $numRules = count($ruleSyntax);
        $numLines = count($file);
        $ruleNo = -1;
        $ruleLine = -1;

        for ($i = 0; $i < $numLines; $i++) {
            $line = $file[$i];
            if ($line == "" || $line[0] == '#') {
                continue;
            }

            // Reading new rule
            if (substr($line, 0, 4) == 'rule') {
                if ($ruleLine > 0) {
                    $errors[] = sprintf(
                        __(
                            'Invalid rule declaration on line %1$s, expected line '
                            . '%2$s of previous rule.'
                        ),
                        $i + 1,
                        $ruleSyntax[$ruleLine++]
                    );
                    continue;
                }
                if (preg_match("/rule\s'(.*)'( \[(.*)\])?$/", $line, $match)) {
                    $ruleLine = 1;
                    $ruleNo++;
                    $rules[$ruleNo] = array('name' => $match[1]);
                    $lines[$ruleNo] = array('name' => $i + 1);
                    if (isset($match[3])) {
                        $rules[$ruleNo]['precondition'] = $match[3];
                        $lines[$ruleNo]['precondition'] = $i + 1;
                    }
                } else {
                    $errors[] = sprintf(
                        __('Invalid rule declaration on line %s.'),
                        $i + 1
                    );
                }
                continue;
            } else {
                if ($ruleLine == -1) {
                    $errors[] = sprintf(
                        __('Unexpected characters on line %s.'),
                        $i + 1
                    );
                }
            }

            // Reading rule lines
            if ($ruleLine > 0) {
                if (!isset($line[0])) {
                    continue; // Empty lines are ok
                }
                // Non tabbed lines are not
                if ($line[0] != "\t") {
                    $errors[] = sprintf(
                        __(
                            'Unexpected character on line %1$s. Expected tab, but '
                            . 'found "%2$s".'
                        ),
                        $i + 1,
                        $line[0]
                    );
                    continue;
                }
                $rules[$ruleNo][$ruleSyntax[$ruleLine]] = chop(
                    mb_substr($line, 1)
                );
                $lines[$ruleNo][$ruleSyntax[$ruleLine]] = $i + 1;
                ++$ruleLine;
            }

            // Rule complete
            if ($ruleLine == $numRules) {
                $ruleLine = -1;
            }
        }

        return array('rules' => $rules, 'lines' => $lines, 'errors' => $errors);
    }
}

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Name Type Size Permission Actions
bfShapeFiles Folder 0755
config Folder 0755
controllers Folder 0755
dbi Folder 0755
di Folder 0755
engines Folder 0755
gis Folder 0755
navigation Folder 0755
plugins Folder 0755
properties Folder 0755
rte Folder 0755
sql-parser Folder 0755
Advisor.php File 15.13 KB 0644
Config.php File 54.7 KB 0644
Console.php File 14.82 KB 0644
DatabaseInterface.php File 95.6 KB 0644
DbList.php File 1.9 KB 0644
DbQbe.php File 68.87 KB 0644
DbSearch.php File 17.21 KB 0644
DisplayResults.php File 206 KB 0644
Error.php File 12.7 KB 0644
ErrorHandler.php File 16.48 KB 0644
File.php File 18.82 KB 0644
Font.php File 4.24 KB 0644
Footer.php File 10.52 KB 0644
Header.php File 25.34 KB 0644
Index.php File 23.79 KB 0644
IndexColumn.php File 4.46 KB 0644
Language.php File 4.27 KB 0644
LanguageManager.php File 20.75 KB 0644
Linter.php File 5.02 KB 0644
ListAbstract.php File 3.15 KB 0644
ListDatabase.php File 4.62 KB 0644
Menu.php File 21.14 KB 0644
Message.php File 18.67 KB 0644
OutputBuffering.php File 3.59 KB 0644
PDF.php File 3.94 KB 0644
Partition.php File 7.26 KB 0644
Psr4Autoloader.php File 4.85 KB 0644
RecentFavoriteTable.php File 11.78 KB 0644
Response.php File 12.61 KB 0644
SavedSearches.php File 11.67 KB 0644
Scripts.php File 7.38 KB 0644
ServerStatusData.php File 15.72 KB 0644
StorageEngine.php File 13.61 KB 0644
SubPartition.php File 3.52 KB 0644
SysInfo.php File 799 B 0644
SysInfoLinux.php File 1.92 KB 0644
SysInfoSunOS.php File 1.86 KB 0644
SysInfoWINNT.php File 3.08 KB 0644
SystemDatabase.php File 3.66 KB 0644
Table.php File 88.12 KB 0644
Template.php File 4.45 KB 0644
Theme.php File 11.34 KB 0644
ThemeManager.php File 12.91 KB 0644
Tracker.php File 30.35 KB 0644
Types.php File 6.08 KB 0644
TypesMySQL.php File 17.26 KB 0644
Util.php File 172.46 KB 0644
VersionInformation.php File 7.87 KB 0644
ZipFile.php File 6.63 KB 0644
advisor.lib.php File 1.6 KB 0644
advisory_rules.txt File 25.94 KB 0644
autoloader.php File 450 B 0644
bookmark.lib.php File 8.5 KB 0644
browse_foreigners.lib.php File 9.83 KB 0644
central_columns.lib.php File 49.38 KB 0644
charset_conversion.lib.php File 3.54 KB 0644
check_user_privileges.lib.php File 10.65 KB 0644
cleanup.lib.php File 1.29 KB 0644
common.inc.php File 34.38 KB 0644
config.default.php File 66.5 KB 0644
config.values.php File 10.17 KB 0644
core.lib.php File 29.94 KB 0644
create_addfield.lib.php File 15.68 KB 0644
database_interface.inc.php File 2.63 KB 0644
db_common.inc.php File 3.12 KB 0644
db_designer.lib.php File 10.4 KB 0644
db_table_exists.lib.php File 3.21 KB 0644
display_change_password.lib.php File 5.45 KB 0644
display_create_table.lib.php File 1.53 KB 0644
display_export.lib.php File 38.11 KB 0644
display_git_revision.lib.php File 3.04 KB 0644
display_import.lib.php File 24.34 KB 0644
display_import_ajax.lib.php File 3.13 KB 0644
display_select_lang.lib.php File 2.36 KB 0644
error.inc.php File 1.21 KB 0644
error_report.lib.php File 10.25 KB 0644
export.lib.php File 35.16 KB 0644
file_listing.lib.php File 2.37 KB 0644
iconv_wrapper.lib.php File 3.88 KB 0644
import.lib.php File 50.64 KB 0644
index.lib.php File 1.37 KB 0644
information_schema_relations.lib.php File 10.95 KB 0644
insert_edit.lib.php File 112.79 KB 0644
ip_allow_deny.lib.php File 9.35 KB 0644
js_escape.lib.php File 4.43 KB 0644
kanji-encoding.lib.php File 4.46 KB 0644
language_stats.inc.php File 1.45 KB 0644
logging.lib.php File 521 B 0644
mime.lib.php File 704 B 0644
mult_submits.inc.php File 10.64 KB 0644
mult_submits.lib.php File 20.44 KB 0644
mysql_charsets.inc.php File 4.09 KB 0644
mysql_charsets.lib.php File 10.47 KB 0644
mysql_relations.lib.php File 5.12 KB 0644
normalization.lib.php File 33.98 KB 0644
opendocument.lib.php File 7.94 KB 0644
operations.lib.php File 73.64 KB 0644
parse_analyze.lib.php File 2.12 KB 0644
plugin_interface.lib.php File 19.69 KB 0644
plugin_interface.lib.php.bak File 19.69 KB 0644
pmd_common.php File 24.2 KB 0644
relation.lib.php File 68.41 KB 0644
relation_cleanup.lib.php File 13.84 KB 0644
replication.inc.php File 8.82 KB 0644
replication_gui.lib.php File 37.45 KB 0644
sanitizing.lib.php File 6.3 KB 0644
select_server.lib.php File 3.4 KB 0644
server_common.inc.php File 1.22 KB 0644
server_common.lib.php File 1.92 KB 0644
server_privileges.lib.php File 179.22 KB 0644
server_status.lib.php File 9.92 KB 0644
server_status_advisor.lib.php File 1.89 KB 0644
server_status_monitor.lib.php File 26.22 KB 0644
server_status_processes.lib.php File 9.57 KB 0644
server_status_queries.lib.php File 4.86 KB 0644
server_status_variables.lib.php File 28.95 KB 0644
server_user_groups.lib.php File 12.8 KB 0644
server_users.lib.php File 1.35 KB 0644
session.inc.php File 5.22 KB 0644
session.lib.php File 735 B 0644
special_schema_links.lib.php File 17.51 KB 0644
sql.lib.php File 77.51 KB 0644
sql.lib.php.bak File 77.51 KB 0644
sql_query_form.lib.php File 15.71 KB 0644
string.lib.php File 800 B 0644
stringMb.lib.php File 1.86 KB 0644
stringNative.lib.php File 6.82 KB 0644
sysinfo.lib.php File 1.34 KB 0644
tbl_columns_definition_form.inc.php File 13.55 KB 0644
tbl_common.inc.php File 1.3 KB 0644
tbl_info.inc.php File 3.54 KB 0644
tbl_partition_definition.inc.php File 5.55 KB 0644
tracking.lib.php File 54.93 KB 0644
transformations.lib.php File 14.63 KB 0644
url_generating.lib.php File 6.77 KB 0644
user_preferences.inc.php File 2.38 KB 0644
user_preferences.lib.php File 8.17 KB 0644
util.lib.php File 749 B 0644
vendor_config.php File 2.49 KB 0644
zip_extension.lib.php File 5.38 KB 0644