component_ajax.php

См. документацию.

<?php
 
use Bitrix\Main\Web\Json;
 
class CComponentAjax
{
    var $componentID = '';
    var $bAjaxSession = false;
    var $bIFrameMode = false;
    var $componentName;
    var $componentTemplate;
    var $arParams;
    var $arCSSList;
    var $arHeadScripts;
    var $bShadow = true;
    var $bJump = true;
    var $bStyle = true;
    var $bHistory = true;
    var $bWrongRedirect = false;
    var $buffer_start_counter;
    var $buffer_finish_counter;
    var $bRestartBufferCalled;
    var $RestartBufferHandlerId;
    var $LocalRedirectHandlerId;
    var $currentUrl = false;
    var $dirname_currentUrl = false;
    var $basename_currentUrl = false;
    var $__nav_params = null;
 
    public function __construct($componentName, $componentTemplate, &$arParams, $parentComponent)
    {
        global $APPLICATION, $USER;
 
        if ($USER->IsAdmin())
        {
            $disableAjaxInGetParameter = $_GET['bitrix_disable_ajax'] ?? null;
            if ($disableAjaxInGetParameter === 'N')
            {
                unset(\Bitrix\Main\Application::getInstance()->getSession()['bitrix_disable_ajax']);
            }
 
            if ($disableAjaxInGetParameter === 'Y' || \Bitrix\Main\Application::getInstance()->getSession()['bitrix_disable_ajax'] == 'Y')
            {
                \Bitrix\Main\Application::getInstance()->getSession()['bitrix_disable_ajax'] = 'Y';
                return;
            }
        }
 
        if ($parentComponent && $this->_checkParent($parentComponent))
        {
            return;
        }
 
        $this->componentName = $componentName;
        $this->componentTemplate = $componentTemplate;
        $this->arParams = $arParams;
 
        $this->bShadow = !isset($this->arParams['AJAX_OPTION_SHADOW']) || $this->arParams['AJAX_OPTION_SHADOW'] != 'N';
        $this->bJump = !isset($this->arParams['AJAX_OPTION_JUMP']) || $this->arParams['AJAX_OPTION_JUMP'] != 'N';
        $this->bStyle = !isset($this->arParams['AJAX_OPTION_STYLE']) || $this->arParams['AJAX_OPTION_STYLE'] != 'N';
        $this->bHistory = !isset($this->arParams['AJAX_OPTION_HISTORY']) || $this->arParams['AJAX_OPTION_HISTORY'] != 'N';
 
        if (!$this->CheckSession())
        {
            return;
        }
 
        CJSCore::Init(['ajax']);
 
        $arParams['AJAX_ID'] = $this->componentID;
 
        if ($this->bAjaxSession)
        {
            // dirty hack: try to get breadcrumb call params
            for ($i = 0, $cnt = count($APPLICATION->buffer_content_type); $i < $cnt; $i++)
            {
                if (is_array($APPLICATION->buffer_content_type[$i]['F']) && $APPLICATION->buffer_content_type[$i]['F'][1] === 'GetNavChain')
                {
                    $this->__nav_params = $APPLICATION->buffer_content_type[$i]['P'];
                }
            }
 
            $APPLICATION->RestartBuffer();
 
            if (!defined('PUBLIC_AJAX_MODE'))
            {
                define('PUBLIC_AJAX_MODE', 1);
            }
 
            if (isset($_REQUEST['AJAX_CALL']))
            {
                $this->bIFrameMode = true;
            }
        }
 
        if ($this->bStyle)
        {
            $this->arCSSList = $APPLICATION->sPath2css;
        }
 
        $this->arHeadScripts = $APPLICATION->arHeadScripts;
 
        if (!$this->bAjaxSession)
        {
            $APPLICATION->AddBufferContent([$this, '__BufferDelimiter']);
        }
 
        $this->buffer_start_counter = count($APPLICATION->buffer_content);
 
        $this->LocalRedirectHandlerId = AddEventHandler('main', 'OnBeforeLocalRedirect', [$this, "LocalRedirectHandler"]);
        $this->RestartBufferHandlerId = AddEventHandler('main', 'OnBeforeRestartBuffer', [$this, 'RestartBufferHandler']);
    }

    protected function _checkParent($parent)
    {
        if (($parent->arParams['AJAX_MODE'] ?? null) === 'Y')
        {
            return true;
        }
        elseif (($parentComponent = $parent->GetParent()))
        {
            return $this->_checkParent($parentComponent);
        }
 
        return false;
    }

    public function __BufferDelimiter()
    {
        return '';
    }
 
    protected function __removeHandlers()
    {
        RemoveEventHandler('main', 'OnBeforeRestartBuffer', $this->RestartBufferHandlerId);
        RemoveEventHandler('main', 'OnBeforeLocalRedirect', $this->LocalRedirectHandlerId);
    }

    public function RestartBufferHandler()
    {
        global $APPLICATION;
 
        $this->bRestartBufferCalled = true;
        //ob_end_clean();
 
        $APPLICATION->AddBufferContent([$this, '__BufferDelimiter']);
        $this->buffer_start_counter = count($APPLICATION->buffer_content);
 
        $this->__removeHandlers();
    }

    public function LocalRedirectHandler(&$url)
    {
        if (!$this->bAjaxSession)
        {
            return;
        }
 
        if ($this->__isAjaxURL($url))
        {
            if (!$this->bIFrameMode)
            {
                Header('X-Bitrix-Ajax-Status: OK');
            }
        }
        else
        {
            if (!$this->bRestartBufferCalled)
            {
                ob_end_clean();
            }
 
            if (!$this->bIFrameMode)
            {
                Header('X-Bitrix-Ajax-Status: Redirect');
            }
 
            $this->bWrongRedirect = true;
 
            echo '<script>' . ($this->bIFrameMode ? 'top.' : 'window.') . 'location.href = \'' . CUtil::JSEscape($url) . '\'</script>';
 
            require_once($_SERVER["DOCUMENT_ROOT"] . BX_ROOT . "/modules/main/include/epilog_after.php");
            exit();
        }
 
        $url = CAjax::AddSessionParam($url, $this->componentID);
 
        $this->__removeHandlers();
    }
 
    protected function CheckSession()
    {
        if ($this->componentID = CAjax::GetComponentID($this->componentName, $this->componentTemplate, $this->arParams['AJAX_OPTION_ADDITIONAL'] ?? null))
        {
            if ($current_session = CAjax::GetSession())
            {
                if ($this->componentID == $current_session)
                {
                    $this->bAjaxSession = true;
                    return true;
                }
                else
                {
                    return false;
                }
            }
            return true;
        }
        return false;
    }
 
    protected function __GetSEFRealUrl($url)
    {
        $arResult = \Bitrix\Main\UrlRewriter::getList(SITE_ID, ['QUERY' => $url]);
 
        if (is_array($arResult) && !empty($arResult))
        {
            return $arResult[0]['PATH'];
        }
        else
        {
            return false;
        }
    }
 
    protected function __isAjaxURL($url)
    {
        global $APPLICATION;
 
        if (preg_match("/^(#|mailto:|javascript:|callto:)/", $url))
        {
            return false;
        }
 
        if (str_contains($url, '://'))
        {
            return false;
        }
 
        if (CFile::IsImage($url))
        {
            return false;
        }
 
        $url = preg_replace('/#.*/', '', $url);
 
        if (($this->arParams['SEF_MODE'] ?? null) === 'Y')
        {
            if ($url == POST_FORM_ACTION_URI)
            {
                return true;
            }
 
            $url = $this->__GetSEFRealUrl($url);
 
            if ($url === false)
            {
                return false;
            }
        }
        else
        {
            if (str_contains($url, '?'))
            {
                $url = mb_substr($url, 0, mb_strpos($url, '?'));
            }
 
            if (!str_ends_with($url, '.php'))
            {
                if (!str_ends_with($url, '/'))
                {
                    $url .= '/';
                }
 
                $url .= 'index.php';
            }
        }
 
        if (!$this->currentUrl)
        {
            $currentUrl = $APPLICATION->GetCurPage();
 
            if (($this->arParams['SEF_MODE'] ?? null) === 'Y')
            {
                $currentUrl = $this->__getSEFRealUrl($currentUrl);
            }
 
            if (str_contains($currentUrl, '?'))
            {
                $currentUrl = mb_substr($currentUrl, 0, mb_strpos($currentUrl, '?'));
            }
 
            if (!str_ends_with($currentUrl, '.php'))
            {
                if (!str_ends_with($currentUrl, '/'))
                {
                    $currentUrl .= '/';
                }
 
                $currentUrl .= 'index.php';
            }
 
            $this->currentUrl = $currentUrl;
            $this->dirname_currentUrl = dirname($currentUrl);
            $this->basename_currentUrl = basename($currentUrl);
        }
 
        $dirname = dirname($url);
        if (
            (
                $dirname == $this->dirname_currentUrl
                ||
                $dirname == ''
                ||
                $dirname == '.'
            )
            &&
            basename($url) == $this->basename_currentUrl
        )
        {
            return true;
        }
 
        return false;
    }
 
    protected function _checkPcreLimit($data)
    {
        $pcre_backtrack_limit = intval(ini_get("pcre.backtrack_limit"));
        $text_len = strlen($data);
        $text_len++;
 
        if ($pcre_backtrack_limit > 0 && $pcre_backtrack_limit < $text_len)
        {
            @ini_set("pcre.backtrack_limit", $text_len);
            $pcre_backtrack_limit = intval(ini_get("pcre.backtrack_limit"));
        }
 
        return $pcre_backtrack_limit >= $text_len;
    }
 
    protected function __PrepareLinks(&$data)
    {
        $add_param = CAjax::GetSessionParam($this->componentID);
 
        $regexp_links = '/(<a\s[^>]*?>.*?<\/a>)/isu';
        $regexp_params = '/([\w\-]+)\s*=\s*([\"\'])(.*?)\2/isu';
 
        $this->_checkPcreLimit($data);
        $arData = preg_split($regexp_links, $data, -1, PREG_SPLIT_DELIM_CAPTURE);
 
        if (!is_array($arData))
        {
            return;
        }
 
        $cData = count($arData);
        if ($cData < 2)
        {
            return;
        }
 
        $arIgnoreAttributes = ['onclick' => true, 'target' => true];
        $arSearch = [
            $add_param . '&',
            $add_param,
            'AJAX_CALL=Y&',
            'AJAX_CALL=Y',
        ];
        $bDataChanged = false;
 
        for ($iData = 1; $iData < $cData; $iData += 2)
        {
            if (!preg_match('/^<a\s([^>]*?)>(.*?)<\/a>$/isu', $arData[$iData], $match))
            {
                continue;
            }
 
            $params = $match[1];
 
            if (!preg_match_all($regexp_params, $params, $arLinkParams))
            {
                continue;
            }
 
            $strAdditional = ' ';
            $url_key = -1;
            $bIgnoreLink = false;
 
            foreach ($arLinkParams[0] as $pkey => $value)
            {
                if ($value == '')
                {
                    continue;
                }
 
                $param_name = mb_strtolower($arLinkParams[1][$pkey]);
 
                if ($param_name === 'href')
                {
                    $url_key = $pkey;
                }
                elseif (isset($arIgnoreAttributes[$param_name]))
                {
                    $bIgnoreLink = true;
                    break;
                }
                else
                {
                    $strAdditional .= $value . ' ';
                }
            }
 
            if ($url_key >= 0 && !$bIgnoreLink)
            {
                $url = \Bitrix\Main\Text\Converter::getHtmlConverter()->decode($arLinkParams[3][$url_key]);
                $url = str_replace($arSearch, '', $url);
 
                if ($this->__isAjaxURL($url))
                {
                    $real_url = $url;
 
                    $pos = mb_strpos($url, '#');
                    if ($pos !== false)
                    {
                        $real_url = mb_substr($real_url, 0, $pos);
                    }
 
                    $real_url .= !str_contains($url, '?') ? '?' : '&';
                    $real_url .= $add_param;
 
                    $url_str = CAjax::GetLinkEx($real_url, $url, $match[2], 'comp_' . $this->componentID, $strAdditional);
 
                    $arData[$iData] = $url_str;
                    $bDataChanged = true;
                }
            }
        }
 
        if ($bDataChanged)
        {
            $data = implode('', $arData);
        }
    }
 
    protected function __PrepareForms(&$data)
    {
        $this->_checkPcreLimit($data);
        $arData = preg_split('/(<form([^>]*)>)/iu', $data, -1, PREG_SPLIT_DELIM_CAPTURE);
 
        $bDataChanged = false;
        if (is_array($arData))
        {
            for ($key = 0, $l = count($arData); $key < $l; $key++)
            {
                if ($key % 3 != 0)
                {
                    $arIgnoreAttributes = ['target'];
                    $bIgnore = false;
                    foreach ($arIgnoreAttributes as $attr)
                    {
                        if (mb_strpos($arData[$key], $attr . '="') !== false)
                        {
                            $bIgnore = true;
                            break;
                        }
                    }
 
                    if (!$bIgnore)
                    {
                        preg_match_all('/action=(["\']{1})(.*?)\1/i', $arData[$key], $arAction);
                        $url = $arAction[2][0];
 
                        if ($url === '' || $this->__isAjaxURL($url) || $this->__isAjaxURL(urldecode($url)))
                        {
                            $arData[$key] = CAjax::GetForm($arData[$key + 1], 'comp_' . $this->componentID, $this->componentID, true, $this->bShadow);
                        }
                        else
                        {
                            $new_url = str_replace(CAjax::GetSessionParam($this->componentID), '', $url);
                            $arData[$key] = str_replace($url, $new_url, $arData[$key]);
                        }
 
                        $bDataChanged = true;
                    }
 
                    unset($arData[$key + 1]);
                    $key++;
                }
            }
        }
 
        if ($bDataChanged)
        {
            $data = implode('', $arData);
        }
    }
 
    protected function __prepareScripts(&$data)
    {
        $regexp = '/(<script(?:[^>]*)?>)(.*?)<\/script>/isu';
 
        $this->_checkPcreLimit($data);
        $scripts_num = preg_match_all($regexp, $data, $out);
 
        $arScripts = [];
 
        if (false !== $scripts_num)
        {
            for ($i = 0; $i < $scripts_num; $i++)
            {
                $data = str_replace($out[0][$i], '', $data);
 
                if ($out[1][$i] <> '' && str_contains($out[1][$i], 'src='))
                {
                    $regexp_src = '/src="([^"]*)?"/i';
                    if (preg_match($regexp_src, $out[1][$i], $out1) != 0)
                    {
                        $arScripts[] = [
                            'TYPE' => 'SCRIPT_SRC',
                            'DATA' => $out1[1],
                        ];
                    }
                }
                else
                {
                    $out[2][$i] = str_replace('<!--', '', $out[2][$i]);
                    $arScripts[] = [
                        'TYPE' => 'SCRIPT',
                        'DATA' => $out[2][$i],
                    ];
                }
            }
        }
 
        if (!empty($arScripts))
        {
            $data .= "
<script>
parent.bxcompajaxframeonload = function() {
    parent.BX.CaptureEventsGet();
    parent.BX.CaptureEvents(parent, 'load');
    parent.BX.evalPack(" . Json::encode($arScripts) . ");
    setTimeout('parent.BX.ajax.__runOnload();', 300);
}</script>
";
        }
    }

    public function _PrepareAdditionalData()
    {
        global $APPLICATION;
 
        // get CSS changes list
        if ($this->bStyle)
        {
            $arCSSList = $APPLICATION->sPath2css;
            $cnt_old = count($this->arCSSList);
            $cnt_new = count($arCSSList);
            $arCSSNew = [];
 
            if ($cnt_old != $cnt_new)
            {
                for ($i = $cnt_old; $i < $cnt_new; $i++)
                {
                    $css_path = $arCSSList[$i];
                    if (mb_strtolower(mb_substr($css_path, 0, 7)) != 'http://' && mb_strtolower(mb_substr($css_path, 0, 8)) != 'https://')
                    {
                        if (($p = mb_strpos($css_path, "?")) > 0)
                        {
                            $css_file = mb_substr($css_path, 0, $p);
                        }
                        else
                        {
                            $css_file = $css_path;
                        }
 
                        if (file_exists($_SERVER["DOCUMENT_ROOT"] . $css_file))
                        {
                            $arCSSNew[] = $arCSSList[$i];
                        }
                    }
                    else
                    {
                        $arCSSNew[] = $arCSSList[$i];
                    }
                }
            }
        }
 
        // get scripts changes list
        $arHeadScripts = $APPLICATION->arHeadScripts;
 
        $cnt_old = count($this->arHeadScripts);
        $cnt_new = count($arHeadScripts);
        $arHeadScriptsNew = [];
 
        if ($cnt_old != $cnt_new)
        {
            for ($i = $cnt_old; $i < $cnt_new; $i++)
            {
                $arHeadScriptsNew[] = $arHeadScripts[$i];
            }
        }
 
        if (!$APPLICATION->oAsset->optimizeJs())
        {
            $arHeadScriptsNew = array_merge(CJSCore::GetScriptsList(), $arHeadScriptsNew);
        }
 
        // prepare additional data
        $arAdditionalData = [];
        $arAdditionalData['TITLE'] = htmlspecialcharsback($APPLICATION->GetTitle());
        $arAdditionalData['WINDOW_TITLE'] = htmlspecialcharsback($APPLICATION->GetTitle('title'));
 
        $arAdditionalData['SCRIPTS'] = [];
        $arHeadScriptsNew = array_unique($arHeadScriptsNew);
 
        foreach ($arHeadScriptsNew as $script)
        {
            $arAdditionalData['SCRIPTS'][] = CUtil::GetAdditionalFileURL($script);
        }
 
        if (null !== $this->__nav_params)
        {
            $arAdditionalData['NAV_CHAIN'] = $APPLICATION->GetNavChain($this->__nav_params[0], $this->__nav_params[1], $this->__nav_params[2], $this->__nav_params[3], $this->__nav_params[4]);
        }
 
        if ($this->bStyle)
        {
            $arAdditionalData["CSS"] = [];
            $arCSSNew = array_unique($arCSSNew);
            foreach ($arCSSNew as $style)
            {
                $arAdditionalData['CSS'][] = CUtil::GetAdditionalFileURL($style);
            }
        }
 
        $additional_data = '<script bxrunfirst="true">' . "\n";
        $additional_data .= 'var arAjaxPageData = ' . Json::encode($arAdditionalData) . ";\r\n";
        $additional_data .= 'parent.BX.ajax.UpdatePageData(arAjaxPageData)' . ";\r\n";
 
        $additional_data .= '</script><script>';
 
        if (!$this->bIFrameMode && $this->bHistory)
        {
            $additional_data .= 'top.BX.ajax.history.put(window.AJAX_PAGE_STATE.getState(), \'' . CUtil::JSEscape(CAjax::encodeURI($APPLICATION->GetCurPageParam('', [BX_AJAX_PARAM_ID], false))) . '\')' . ";\r\n";
        }
 
        if ($this->bJump)
        {
            $additional_data .= (
            $this->bIFrameMode
                ? 'setTimeout(\'BX.scrollToNode("comp_' . $this->componentID . '")\', 100)' . ";\r\n"
                : 'top.BX.scrollToNode(\'comp_' . $this->componentID . '\')' . ";\r\n"
            );
        }
 
        $additional_data .= '</script>';
 
        return $additional_data;
    }

    public function _PrepareData()
    {
        global $APPLICATION;
 
        if ($this->bWrongRedirect)
        {
            return null;
        }
 
        $arBuffer = array_slice($APPLICATION->buffer_content, $this->buffer_start_counter, $this->buffer_finish_counter - $this->buffer_start_counter);
 
        $delimiter = '###AJAX_' . $APPLICATION->GetServerUniqID() . '###';
 
        $data = implode($delimiter, $arBuffer);
 
        $this->__PrepareLinks($data);
        $this->__PrepareForms($data);
 
        if (!$this->bAjaxSession)
        {
            $data = '<div id="comp_' . $this->componentID . '">' . $data . '</div>';
 
            if ($this->bHistory)
            {
                $data =
                    '<script>if (window.location.hash != \'\' && window.location.hash != \'#\') top.BX.ajax.history.checkRedirectStart(\'' . CUtil::JSEscape(BX_AJAX_PARAM_ID) . '\', \'' . CUtil::JSEscape($this->componentID) . '\')</script>'
                    . $data
                    . '<script>if (top.BX.ajax.history.bHashCollision) top.BX.ajax.history.checkRedirectFinish(\'' . CUtil::JSEscape(BX_AJAX_PARAM_ID) . '\', \'' . CUtil::JSEscape($this->componentID) . '\');</script>'
                    . '<script>top.BX.ready(BX.defer(function() {window.AJAX_PAGE_STATE = new top.BX.ajax.component(\'comp_' . $this->componentID . '\'); top.BX.ajax.history.init(window.AJAX_PAGE_STATE);}))</script>';
            }
        }
        else
        {
            if ($this->bIFrameMode)
            {
                $this->__PrepareScripts($data);
 
                // fix IE bug;
                $data = '<html><head></head><body>' . $data . '</body></html>';
            }
        }
 
        $arBuffer = explode($delimiter, $data);
        for ($i = 0, $cnt = count($arBuffer); $i < $cnt; $i++)
        {
            $APPLICATION->buffer_content[$this->buffer_start_counter + $i] = $arBuffer[$i];
        }
 
        return '';
    }
 
    public function Process()
    {
        global $APPLICATION;
 
        if ($this->componentID == '')
        {
            return;
        }
 
        $this->buffer_finish_counter = count($APPLICATION->buffer_content) + 1;
 
        $APPLICATION->AddBufferContent([$this, '_PrepareData']);
 
        $this->__removeHandlers();
 
        if ($this->bAjaxSession)
        {
            $eventManager = \Bitrix\Main\EventManager::getInstance();
 
            $eventManager->addEventHandlerCompatible('main', 'onAfterAjaxResponse', [$this, '_PrepareAdditionalData']);
            $eventManager->addEventHandlerCompatible('main', 'OnEndBufferContent', ['CComponentAjax', 'executeEvents']);
 
            require_once($_SERVER["DOCUMENT_ROOT"] . BX_ROOT . "/modules/main/include/epilog_after.php");
            exit();
        }
    }
 
    // will be called as delay function and not in class entity context
    public static function executeEvents(&$content = '')
    {
        ob_start();
 
        foreach (GetModuleEvents('main', 'onAfterAjaxResponse', true) as $arEvent)
        {
            echo ExecuteModuleEventEx($arEvent);
        }
 
        $content = ob_get_clean() . $content;
    }
}