phpmyadmin working

1 files changed, 924 insertions, 0 deletions

diff --git a/srcs/phpmyadmin/libraries/classes/Config/FormDisplay.php b/srcs/phpmyadmin/libraries/classes/Config/FormDisplay.php
new file mode 100644
index 0000000..500706c
--- /dev/null
+++ b/srcs/phpmyadmin/libraries/classes/Config/FormDisplay.php
@@ -0,0 +1,924 @@
+<?php
+/* vim: set expandtab sw=4 ts=4 sts=4: */
+/**
+ * Form management class, displays and processes forms
+ *
+ * Explanation of used terms:
+ * o work_path - original field path, eg. Servers/4/verbose
+ * o system_path - work_path modified so that it points to the first server,
+ *                 eg. Servers/1/verbose
+ * o translated_path - work_path modified for HTML field name, a path with
+ *                     slashes changed to hyphens, eg. Servers-4-verbose
+ *
+ * @package PhpMyAdmin
+ */
+declare(strict_types=1);
+
+namespace PhpMyAdmin\Config;
+
+use PhpMyAdmin\Config\Forms\User\UserFormList;
+use PhpMyAdmin\Sanitize;
+use PhpMyAdmin\Util;
+
+/**
+ * Form management class, displays and processes forms
+ *
+ * @package PhpMyAdmin
+ */
+class FormDisplay
+{
+    /**
+     * ConfigFile instance
+     * @var ConfigFile
+     */
+    private $_configFile;
+
+    /**
+     * Form list
+     * @var Form[]
+     */
+    private $_forms = [];
+
+    /**
+     * Stores validation errors, indexed by paths
+     * [ Form_name ] is an array of form errors
+     * [path] is a string storing error associated with single field
+     * @var array
+     */
+    private $_errors = [];
+
+    /**
+     * Paths changed so that they can be used as HTML ids, indexed by paths
+     * @var array
+     */
+    private $_translatedPaths = [];
+
+    /**
+     * Server paths change indexes so we define maps from current server
+     * path to the first one, indexed by work path
+     * @var array
+     */
+    private $_systemPaths = [];
+
+    /**
+     * Language strings which will be sent to Messages JS variable
+     * Will be looked up in $GLOBALS: str{value} or strSetup{value}
+     * @var array
+     */
+    private $_jsLangStrings = [];
+
+    /**
+     * Tells whether forms have been validated
+     * @var bool
+     */
+    private $_isValidated = true;
+
+    /**
+     * Dictionary with user preferences keys
+     * @var array|null
+     */
+    private $_userprefsKeys;
+
+    /**
+     * Dictionary with disallowed user preferences keys
+     * @var array
+     */
+    private $_userprefsDisallow;
+
+    /**
+     * @var FormDisplayTemplate
+     */
+    private $formDisplayTemplate;
+
+    /**
+     * Constructor
+     *
+     * @param ConfigFile $cf Config file instance
+     */
+    public function __construct(ConfigFile $cf)
+    {
+        $this->formDisplayTemplate = new FormDisplayTemplate($GLOBALS['PMA_Config']);
+        $this->_jsLangStrings = [
+            'error_nan_p' => __('Not a positive number!'),
+            'error_nan_nneg' => __('Not a non-negative number!'),
+            'error_incorrect_port' => __('Not a valid port number!'),
+            'error_invalid_value' => __('Incorrect value!'),
+            'error_value_lte' => __('Value must be less than or equal to %s!'),
+        ];
+        $this->_configFile = $cf;
+        // initialize validators
+        Validator::getValidators($this->_configFile);
+    }
+
+    /**
+     * Returns {@link ConfigFile} associated with this instance
+     *
+     * @return ConfigFile
+     */
+    public function getConfigFile()
+    {
+        return $this->_configFile;
+    }
+
+    /**
+     * Registers form in form manager
+     *
+     * @param string $formName Form name
+     * @param array  $form     Form data
+     * @param int    $serverId 0 if new server, validation; >= 1 if editing a server
+     *
+     * @return void
+     */
+    public function registerForm($formName, array $form, $serverId = null)
+    {
+        $this->_forms[$formName] = new Form(
+            $formName,
+            $form,
+            $this->_configFile,
+            $serverId
+        );
+        $this->_isValidated = false;
+        foreach ($this->_forms[$formName]->fields as $path) {
+            $workPath = $serverId === null
+                ? $path
+                : str_replace('Servers/1/', "Servers/$serverId/", $path);
+            $this->_systemPaths[$workPath] = $path;
+            $this->_translatedPaths[$workPath] = str_replace('/', '-', $workPath);
+        }
+    }
+
+    /**
+     * Processes forms, returns true on successful save
+     *
+     * @param bool $allowPartialSave allows for partial form saving
+     *                               on failed validation
+     * @param bool $checkFormSubmit  whether check for $_POST['submit_save']
+     *
+     * @return boolean whether processing was successful
+     */
+    public function process($allowPartialSave = true, $checkFormSubmit = true)
+    {
+        if ($checkFormSubmit && ! isset($_POST['submit_save'])) {
+            return false;
+        }
+
+        // save forms
+        if (count($this->_forms) > 0) {
+            return $this->save(array_keys($this->_forms), $allowPartialSave);
+        }
+        return false;
+    }
+
+    /**
+     * Runs validation for all registered forms
+     *
+     * @return void
+     */
+    private function _validate()
+    {
+        if ($this->_isValidated) {
+            return;
+        }
+
+        $paths = [];
+        $values = [];
+        foreach ($this->_forms as $form) {
+            /** @var Form $form */
+            $paths[] = $form->name;
+            // collect values and paths
+            foreach ($form->fields as $path) {
+                $workPath = array_search($path, $this->_systemPaths);
+                $values[$path] = $this->_configFile->getValue($workPath);
+                $paths[] = $path;
+            }
+        }
+
+        // run validation
+        $errors = Validator::validate(
+            $this->_configFile,
+            $paths,
+            $values,
+            false
+        );
+
+        // change error keys from canonical paths to work paths
+        if (is_array($errors) && count($errors) > 0) {
+            $this->_errors = [];
+            foreach ($errors as $path => $errorList) {
+                $workPath = array_search($path, $this->_systemPaths);
+                // field error
+                if (! $workPath) {
+                    // form error, fix path
+                    $workPath = $path;
+                }
+                $this->_errors[$workPath] = $errorList;
+            }
+        }
+        $this->_isValidated = true;
+    }
+
+    /**
+     * Outputs HTML for the forms under the menu tab
+     *
+     * @param bool  $showRestoreDefault whether to show "restore default"
+     *                                  button besides the input field
+     * @param array $jsDefault          stores JavaScript code
+     *                                  to be displayed
+     * @param array $js                 will be updated with javascript code
+     * @param bool  $showButtons        whether show submit and reset button
+     *
+     * @return string
+     */
+    private function _displayForms(
+        $showRestoreDefault,
+        array &$jsDefault,
+        array &$js,
+        $showButtons
+    ) {
+        $htmlOutput = '';
+        $validators = Validator::getValidators($this->_configFile);
+
+        foreach ($this->_forms as $form) {
+            /** @var Form $form */
+            $formErrors = isset($this->_errors[$form->name])
+                ? $this->_errors[$form->name] : null;
+            $htmlOutput .= $this->formDisplayTemplate->displayFieldsetTop(
+                Descriptions::get("Form_{$form->name}"),
+                Descriptions::get("Form_{$form->name}", 'desc'),
+                $formErrors,
+                ['id' => $form->name]
+            );
+
+            foreach ($form->fields as $field => $path) {
+                $workPath = array_search($path, $this->_systemPaths);
+                $translatedPath = $this->_translatedPaths[$workPath];
+                // always true/false for user preferences display
+                // otherwise null
+                $userPrefsAllow = isset($this->_userprefsKeys[$path])
+                    ? ! isset($this->_userprefsDisallow[$path])
+                    : null;
+                // display input
+                $htmlOutput .= $this->_displayFieldInput(
+                    $form,
+                    $field,
+                    $path,
+                    $workPath,
+                    $translatedPath,
+                    $showRestoreDefault,
+                    $userPrefsAllow,
+                    $jsDefault
+                );
+                // register JS validators for this field
+                if (isset($validators[$path])) {
+                    $this->formDisplayTemplate->addJsValidate($translatedPath, $validators[$path], $js);
+                }
+            }
+            $htmlOutput .= $this->formDisplayTemplate->displayFieldsetBottom($showButtons);
+        }
+        return $htmlOutput;
+    }
+
+    /**
+     * Outputs HTML for forms
+     *
+     * @param bool       $tabbedForm         if true, use a form with tabs
+     * @param bool       $showRestoreDefault whether show "restore default" button
+     *                                       besides the input field
+     * @param bool       $showButtons        whether show submit and reset button
+     * @param string     $formAction         action attribute for the form
+     * @param array|null $hiddenFields       array of form hidden fields (key: field
+     *                                       name)
+     *
+     * @return string HTML for forms
+     */
+    public function getDisplay(
+        $tabbedForm = false,
+        $showRestoreDefault = false,
+        $showButtons = true,
+        $formAction = null,
+        $hiddenFields = null
+    ) {
+        static $jsLangSent = false;
+
+        $htmlOutput = '';
+
+        $js = [];
+        $jsDefault = [];
+
+        $htmlOutput .= $this->formDisplayTemplate->displayFormTop($formAction, 'post', $hiddenFields);
+
+        if ($tabbedForm) {
+            $tabs = [];
+            foreach ($this->_forms as $form) {
+                $tabs[$form->name] = Descriptions::get("Form_$form->name");
+            }
+            $htmlOutput .= $this->formDisplayTemplate->displayTabsTop($tabs);
+        }
+
+        // validate only when we aren't displaying a "new server" form
+        $isNewServer = false;
+        foreach ($this->_forms as $form) {
+            /** @var Form $form */
+            if ($form->index === 0) {
+                $isNewServer = true;
+                break;
+            }
+        }
+        if (! $isNewServer) {
+            $this->_validate();
+        }
+
+        // user preferences
+        $this->_loadUserprefsInfo();
+
+        // display forms
+        $htmlOutput .= $this->_displayForms(
+            $showRestoreDefault,
+            $jsDefault,
+            $js,
+            $showButtons
+        );
+
+        if ($tabbedForm) {
+            $htmlOutput .= $this->formDisplayTemplate->displayTabsBottom();
+        }
+        $htmlOutput .= $this->formDisplayTemplate->displayFormBottom();
+
+        // if not already done, send strings used for validation to JavaScript
+        if (! $jsLangSent) {
+            $jsLangSent = true;
+            $jsLang = [];
+            foreach ($this->_jsLangStrings as $strName => $strValue) {
+                $jsLang[] = "'$strName': '" . Sanitize::jsFormat($strValue, false) . '\'';
+            }
+            $js[] = "$.extend(Messages, {\n\t"
+                . implode(",\n\t", $jsLang) . '})';
+        }
+
+        $js[] = "$.extend(defaultValues, {\n\t"
+            . implode(",\n\t", $jsDefault) . '})';
+        $htmlOutput .= $this->formDisplayTemplate->displayJavascript($js);
+
+        return $htmlOutput;
+    }
+
+    /**
+     * Prepares data for input field display and outputs HTML code
+     *
+     * @param Form      $form               Form object
+     * @param string    $field              field name as it appears in $form
+     * @param string    $systemPath         field path, eg. Servers/1/verbose
+     * @param string    $workPath           work path, eg. Servers/4/verbose
+     * @param string    $translatedPath     work path changed so that it can be
+     *                                      used as XHTML id
+     * @param bool      $showRestoreDefault whether show "restore default" button
+     *                                      besides the input field
+     * @param bool|null $userPrefsAllow     whether user preferences are enabled
+     *                                      for this field (null - no support,
+     *                                      true/false - enabled/disabled)
+     * @param array     $jsDefault          array which stores JavaScript code
+     *                                      to be displayed
+     *
+     * @return string|null HTML for input field
+     */
+    private function _displayFieldInput(
+        Form $form,
+        $field,
+        $systemPath,
+        $workPath,
+        $translatedPath,
+        $showRestoreDefault,
+        $userPrefsAllow,
+        array &$jsDefault
+    ) {
+        $name = Descriptions::get($systemPath);
+        $description = Descriptions::get($systemPath, 'desc');
+
+        $value = $this->_configFile->get($workPath);
+        $valueDefault = $this->_configFile->getDefault($systemPath);
+        $valueIsDefault = false;
+        if ($value === null || $value === $valueDefault) {
+            $value = $valueDefault;
+            $valueIsDefault = true;
+        }
+
+        $opts = [
+            'doc' => $this->getDocLink($systemPath),
+            'show_restore_default' => $showRestoreDefault,
+            'userprefs_allow' => $userPrefsAllow,
+            'userprefs_comment' => Descriptions::get($systemPath, 'cmt'),
+        ];
+        if (isset($form->default[$systemPath])) {
+            $opts['setvalue'] = (string) $form->default[$systemPath];
+        }
+
+        if (isset($this->_errors[$workPath])) {
+            $opts['errors'] = $this->_errors[$workPath];
+        }
+
+        $type = '';
+        switch ($form->getOptionType($field)) {
+            case 'string':
+                $type = 'text';
+                break;
+            case 'short_string':
+                $type = 'short_text';
+                break;
+            case 'double':
+            case 'integer':
+                $type = 'number_text';
+                break;
+            case 'boolean':
+                $type = 'checkbox';
+                break;
+            case 'select':
+                $type = 'select';
+                $opts['values'] = $form->getOptionValueList($form->fields[$field]);
+                break;
+            case 'array':
+                $type = 'list';
+                $value = (array) $value;
+                $valueDefault = (array) $valueDefault;
+                break;
+            case 'group':
+                // :group:end is changed to :group:end:{unique id} in Form class
+                $htmlOutput = '';
+                if (mb_substr($field, 7, 4) != 'end:') {
+                    $htmlOutput .= $this->formDisplayTemplate->displayGroupHeader(
+                        mb_substr($field, 7)
+                    );
+                } else {
+                    $this->formDisplayTemplate->displayGroupFooter();
+                }
+                return $htmlOutput;
+            case 'NULL':
+                trigger_error("Field $systemPath has no type", E_USER_WARNING);
+                return null;
+        }
+
+        // detect password fields
+        if ($type === 'text'
+            && (mb_substr($translatedPath, -9) === '-password'
+               || mb_substr($translatedPath, -4) === 'pass'
+               || mb_substr($translatedPath, -4) === 'Pass')
+        ) {
+            $type = 'password';
+        }
+
+        // TrustedProxies requires changes before displaying
+        if ($systemPath == 'TrustedProxies') {
+            foreach ($value as $ip => &$v) {
+                if (! preg_match('/^-\d+$/', $ip)) {
+                    $v = $ip . ': ' . $v;
+                }
+            }
+        }
+        $this->_setComments($systemPath, $opts);
+
+        // send default value to form's JS
+        $jsLine = '\'' . $translatedPath . '\': ';
+        switch ($type) {
+            case 'text':
+            case 'short_text':
+            case 'number_text':
+            case 'password':
+                $jsLine .= '\'' . Sanitize::escapeJsString($valueDefault) . '\'';
+                break;
+            case 'checkbox':
+                $jsLine .= $valueDefault ? 'true' : 'false';
+                break;
+            case 'select':
+                $valueDefaultJs = is_bool($valueDefault)
+                ? (int) $valueDefault
+                : $valueDefault;
+                $jsLine .= '[\'' . Sanitize::escapeJsString($valueDefaultJs) . '\']';
+                break;
+            case 'list':
+                $jsLine .= '\'' . Sanitize::escapeJsString(implode("\n", $valueDefault))
+                . '\'';
+                break;
+        }
+        $jsDefault[] = $jsLine;
+
+        return $this->formDisplayTemplate->displayInput(
+            $translatedPath,
+            $name,
+            $type,
+            $value,
+            $description,
+            $valueIsDefault,
+            $opts
+        );
+    }
+
+    /**
+     * Displays errors
+     *
+     * @return string|null HTML for errors
+     */
+    public function displayErrors()
+    {
+        $this->_validate();
+        if (count($this->_errors) === 0) {
+            return null;
+        }
+
+        $htmlOutput = '';
+
+        foreach ($this->_errors as $systemPath => $errorList) {
+            if (isset($this->_systemPaths[$systemPath])) {
+                $name = Descriptions::get($this->_systemPaths[$systemPath]);
+            } else {
+                $name = Descriptions::get('Form_' . $systemPath);
+            }
+            $htmlOutput .= $this->formDisplayTemplate->displayErrors($name, $errorList);
+        }
+
+        return $htmlOutput;
+    }
+
+    /**
+     * Reverts erroneous fields to their default values
+     *
+     * @return void
+     */
+    public function fixErrors()
+    {
+        $this->_validate();
+        if (count($this->_errors) === 0) {
+            return;
+        }
+
+        $cf = $this->_configFile;
+        foreach (array_keys($this->_errors) as $workPath) {
+            if (! isset($this->_systemPaths[$workPath])) {
+                continue;
+            }
+            $canonicalPath = $this->_systemPaths[$workPath];
+            $cf->set($workPath, $cf->getDefault($canonicalPath));
+        }
+    }
+
+    /**
+     * Validates select field and casts $value to correct type
+     *
+     * @param string $value   Current value
+     * @param array  $allowed List of allowed values
+     *
+     * @return bool
+     */
+    private function _validateSelect(&$value, array $allowed)
+    {
+        $valueCmp = is_bool($value)
+            ? (int) $value
+            : $value;
+        foreach ($allowed as $vk => $v) {
+            // equality comparison only if both values are numeric or not numeric
+            // (allows to skip 0 == 'string' equalling to true)
+            // or identity (for string-string)
+            if (($vk == $value && ! (is_numeric($valueCmp) xor is_numeric($vk)))
+                || $vk === $value
+            ) {
+                // keep boolean value as boolean
+                if (! is_bool($value)) {
+                    settype($value, gettype($vk));
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Validates and saves form data to session
+     *
+     * @param array|string $forms            array of form names
+     * @param bool         $allowPartialSave allows for partial form saving on
+     *                                       failed validation
+     *
+     * @return boolean true on success (no errors and all saved)
+     */
+    public function save($forms, $allowPartialSave = true)
+    {
+        $result = true;
+        $forms = (array) $forms;
+
+        $values = [];
+        $toSave = [];
+        $isSetupScript = $GLOBALS['PMA_Config']->get('is_setup');
+        if ($isSetupScript) {
+            $this->_loadUserprefsInfo();
+        }
+
+        $this->_errors = [];
+        foreach ($forms as $formName) {
+            /** @var Form $form */
+            if (isset($this->_forms[$formName])) {
+                $form = $this->_forms[$formName];
+            } else {
+                continue;
+            }
+            // get current server id
+            $changeIndex = $form->index === 0
+                ? $this->_configFile->getServerCount() + 1
+                : false;
+            // grab POST values
+            foreach ($form->fields as $field => $systemPath) {
+                $workPath = array_search($systemPath, $this->_systemPaths);
+                $key = $this->_translatedPaths[$workPath];
+                $type = $form->getOptionType($field);
+
+                // skip groups
+                if ($type == 'group') {
+                    continue;
+                }
+
+                // ensure the value is set
+                if (! isset($_POST[$key])) {
+                    // checkboxes aren't set by browsers if they're off
+                    if ($type == 'boolean') {
+                        $_POST[$key] = false;
+                    } else {
+                        $this->_errors[$form->name][] = sprintf(
+                            __('Missing data for %s'),
+                            '<i>' . Descriptions::get($systemPath) . '</i>'
+                        );
+                        $result = false;
+                        continue;
+                    }
+                }
+
+                // user preferences allow/disallow
+                if ($isSetupScript
+                    && isset($this->_userprefsKeys[$systemPath])
+                ) {
+                    if (isset($this->_userprefsDisallow[$systemPath])
+                        && isset($_POST[$key . '-userprefs-allow'])
+                    ) {
+                        unset($this->_userprefsDisallow[$systemPath]);
+                    } elseif (! isset($_POST[$key . '-userprefs-allow'])) {
+                        $this->_userprefsDisallow[$systemPath] = true;
+                    }
+                }
+
+                // cast variables to correct type
+                switch ($type) {
+                    case 'double':
+                        $_POST[$key] = Util::requestString($_POST[$key]);
+                        settype($_POST[$key], 'float');
+                        break;
+                    case 'boolean':
+                    case 'integer':
+                        if ($_POST[$key] !== '') {
+                            $_POST[$key] = Util::requestString($_POST[$key]);
+                            settype($_POST[$key], $type);
+                        }
+                        break;
+                    case 'select':
+                        $successfullyValidated = $this->_validateSelect(
+                            $_POST[$key],
+                            $form->getOptionValueList($systemPath)
+                        );
+                        if (! $successfullyValidated) {
+                            $this->_errors[$workPath][] = __('Incorrect value!');
+                            $result = false;
+                            // "continue" for the $form->fields foreach-loop
+                            continue 2;
+                        }
+                        break;
+                    case 'string':
+                    case 'short_string':
+                        $_POST[$key] = Util::requestString($_POST[$key]);
+                        break;
+                    case 'array':
+                        // eliminate empty values and ensure we have an array
+                        $postValues = is_array($_POST[$key])
+                        ? $_POST[$key]
+                        : explode("\n", $_POST[$key]);
+                        $_POST[$key] = [];
+                        $this->_fillPostArrayParameters($postValues, $key);
+                        break;
+                }
+
+                // now we have value with proper type
+                $values[$systemPath] = $_POST[$key];
+                if ($changeIndex !== false) {
+                    $workPath = str_replace(
+                        "Servers/$form->index/",
+                        "Servers/$changeIndex/",
+                        $workPath
+                    );
+                }
+                $toSave[$workPath] = $systemPath;
+            }
+        }
+
+        // save forms
+        if (! $allowPartialSave && ! empty($this->_errors)) {
+            // don't look for non-critical errors
+            $this->_validate();
+            return $result;
+        }
+
+        foreach ($toSave as $workPath => $path) {
+            // TrustedProxies requires changes before saving
+            if ($path == 'TrustedProxies') {
+                $proxies = [];
+                $i = 0;
+                foreach ($values[$path] as $value) {
+                    $matches = [];
+                    $match = preg_match(
+                        "/^(.+):(?:[ ]?)(\\w+)$/",
+                        $value,
+                        $matches
+                    );
+                    if ($match) {
+                        // correct 'IP: HTTP header' pair
+                        $ip = trim($matches[1]);
+                        $proxies[$ip] = trim($matches[2]);
+                    } else {
+                        // save also incorrect values
+                        $proxies["-$i"] = $value;
+                        $i++;
+                    }
+                }
+                $values[$path] = $proxies;
+            }
+            $this->_configFile->set($workPath, $values[$path], $path);
+        }
+        if ($isSetupScript) {
+            $this->_configFile->set(
+                'UserprefsDisallow',
+                array_keys($this->_userprefsDisallow)
+            );
+        }
+
+        // don't look for non-critical errors
+        $this->_validate();
+
+        return $result;
+    }
+
+    /**
+     * Tells whether form validation failed
+     *
+     * @return boolean
+     */
+    public function hasErrors()
+    {
+        return count($this->_errors) > 0;
+    }
+
+
+    /**
+     * Returns link to documentation
+     *
+     * @param string $path Path to documentation
+     *
+     * @return string
+     */
+    public function getDocLink($path)
+    {
+        $test = mb_substr($path, 0, 6);
+        if ($test == 'Import' || $test == 'Export') {
+            return '';
+        }
+        return Util::getDocuLink(
+            'config',
+            'cfg_' . $this->_getOptName($path)
+        );
+    }
+
+    /**
+     * Changes path so it can be used in URLs
+     *
+     * @param string $path Path
+     *
+     * @return string
+     */
+    private function _getOptName($path)
+    {
+        return str_replace(['Servers/1/', '/'], ['Servers/', '_'], $path);
+    }
+
+    /**
+     * Fills out {@link userprefs_keys} and {@link userprefs_disallow}
+     *
+     * @return void
+     */
+    private function _loadUserprefsInfo()
+    {
+        if ($this->_userprefsKeys !== null) {
+            return;
+        }
+
+        $this->_userprefsKeys = array_flip(UserFormList::getFields());
+        // read real config for user preferences display
+        $userPrefsDisallow = $GLOBALS['PMA_Config']->get('is_setup')
+            ? $this->_configFile->get('UserprefsDisallow', [])
+            : $GLOBALS['cfg']['UserprefsDisallow'];
+        $this->_userprefsDisallow = array_flip($userPrefsDisallow);
+    }
+
+    /**
+     * Sets field comments and warnings based on current environment
+     *
+     * @param string $systemPath Path to settings
+     * @param array  $opts       Chosen options
+     *
+     * @return void
+     */
+    private function _setComments($systemPath, array &$opts)
+    {
+        // RecodingEngine - mark unavailable types
+        if ($systemPath == 'RecodingEngine') {
+            $comment = '';
+            if (! function_exists('iconv')) {
+                $opts['values']['iconv'] .= ' (' . __('unavailable') . ')';
+                $comment = sprintf(
+                    __('"%s" requires %s extension'),
+                    'iconv',
+                    'iconv'
+                );
+            }
+            if (! function_exists('recode_string')) {
+                $opts['values']['recode'] .= ' (' . __('unavailable') . ')';
+                $comment .= ($comment ? ", " : '') . sprintf(
+                    __('"%s" requires %s extension'),
+                    'recode',
+                    'recode'
+                );
+            }
+            /* mbstring is always there thanks to polyfill */
+            $opts['comment'] = $comment;
+            $opts['comment_warning'] = true;
+        }
+        // ZipDump, GZipDump, BZipDump - check function availability
+        if ($systemPath == 'ZipDump'
+            || $systemPath == 'GZipDump'
+            || $systemPath == 'BZipDump'
+        ) {
+            $comment = '';
+            $funcs = [
+                'ZipDump'  => [
+                    'zip_open',
+                    'gzcompress',
+                ],
+                'GZipDump' => [
+                    'gzopen',
+                    'gzencode',
+                ],
+                'BZipDump' => [
+                    'bzopen',
+                    'bzcompress',
+                ],
+            ];
+            if (! function_exists($funcs[$systemPath][0])) {
+                $comment = sprintf(
+                    __(
+                        'Compressed import will not work due to missing function %s.'
+                    ),
+                    $funcs[$systemPath][0]
+                );
+            }
+            if (! function_exists($funcs[$systemPath][1])) {
+                $comment .= ($comment ? '; ' : '') . sprintf(
+                    __(
+                        'Compressed export will not work due to missing function %s.'
+                    ),
+                    $funcs[$systemPath][1]
+                );
+            }
+            $opts['comment'] = $comment;
+            $opts['comment_warning'] = true;
+        }
+        if (! $GLOBALS['PMA_Config']->get('is_setup')) {
+            if ($systemPath == 'MaxDbList' || $systemPath == 'MaxTableList'
+                || $systemPath == 'QueryHistoryMax'
+            ) {
+                $opts['comment'] = sprintf(
+                    __('maximum %s'),
+                    $GLOBALS['cfg'][$systemPath]
+                );
+            }
+        }
+    }
+
+    /**
+     * Copy items of an array to $_POST variable
+     *
+     * @param array  $postValues List of parameters
+     * @param string $key        Array key
+     *
+     * @return void
+     */
+    private function _fillPostArrayParameters(array $postValues, $key)
+    {
+        foreach ($postValues as $v) {
+            $v = Util::requestString($v);
+            if ($v !== '') {
+                $_POST[$key][] = $v;
+            }
+        }
+    }
+}