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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| /* | ||
| * (c) Copyright Ascensio System SIA 2010-2023 | ||
| * | ||
| * This program is a free software product. You can redistribute it and/or | ||
| * modify it under the terms of the GNU Affero General Public License (AGPL) | ||
| * version 3 as published by the Free Software Foundation. In accordance with | ||
| * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect | ||
| * that Ascensio System SIA expressly excludes the warranty of non-infringement | ||
| * of any third-party rights. | ||
| * | ||
| * This program is distributed WITHOUT ANY WARRANTY; without even the implied | ||
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For | ||
| * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html | ||
| * | ||
| * You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish | ||
| * street, Riga, Latvia, EU, LV-1050. | ||
| * | ||
| * The interactive user interfaces in modified source and object code versions | ||
| * of the Program must display Appropriate Legal Notices, as required under | ||
| * Section 5 of the GNU AGPL version 3. | ||
| * | ||
| * Pursuant to Section 7(b) of the License you must retain the original Product | ||
| * logo when distributing the program. Pursuant to Section 7(e) we decline to | ||
| * grant you any rights under trademark law for use of our trademarks. | ||
| * | ||
| * All the Product's GUI elements, including illustrations and icon sets, as | ||
| * well as technical writing content are licensed under the terms of the | ||
| * Creative Commons Attribution-ShareAlike 4.0 International. See the License | ||
| * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode | ||
| * | ||
| */ | ||
| function checkExtendedPDF(directUrl, key, url, token, callback) { | ||
| var limit = 110; | ||
| if (directUrl) { | ||
| downloadPartialy(directUrl, limit, null, function(text) { | ||
| callback(isExtendedPDFFile(text)) | ||
| }); | ||
| } else { | ||
| let postData = JSON.stringify({ | ||
| 'url': url, | ||
| "token": token | ||
| }); | ||
| var handlerUrl = "../../../../downloadfile/"+encodeURIComponent(key); | ||
| downloadPartialy(handlerUrl, limit, postData, function(text) { | ||
| callback(isExtendedPDFFile(text)) | ||
| }); | ||
| } | ||
| } | ||
| function isExtendedPDFFile(text) { | ||
| if (!text) { | ||
| return false; | ||
| } | ||
| const indexFirst = text.indexOf('%\xCD\xCA\xD2\xA9\x0D'); | ||
| if (indexFirst === -1) { | ||
| return false; | ||
| } | ||
|
|
||
| let pFirst = text.substring(indexFirst + 6); | ||
|
|
||
| if (!(pFirst.lastIndexOf('1 0 obj\x0A<<\x0A', 0) === 0)) { | ||
| return false; | ||
| } | ||
|
|
||
| pFirst = pFirst.substring(11); | ||
|
|
||
| let signature = 'ONLYOFFICEFORM'; | ||
| const indexStream = pFirst.indexOf('stream\x0D\x0A'); | ||
| const indexMeta = pFirst.indexOf(signature); | ||
|
|
||
| if (indexStream === -1 || indexMeta === -1 || indexStream < indexMeta) { | ||
| return false; | ||
| } | ||
|
|
||
| let pMeta = pFirst.substring(indexMeta); | ||
| pMeta = pMeta.substring(signature.length + 3); | ||
|
|
||
| let indexMetaLast = pMeta.indexOf(' '); | ||
| if (indexMetaLast === -1) { | ||
| return false; | ||
| } | ||
|
|
||
| pMeta = pMeta.substring(indexMetaLast + 1); | ||
|
|
||
| indexMetaLast = pMeta.indexOf(' '); | ||
| if (indexMetaLast === -1) { | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
| function downloadPartialy(url, limit, postData, callback) { | ||
| var callbackCalled = false; | ||
| var xhr = new XMLHttpRequest(); | ||
| //value of responseText always has the current content received from the server, even if it's incomplete | ||
| // xhr.responseType = "json"; it raises an IE error. bug 66160 | ||
| xhr.overrideMimeType('text/xml; charset=iso-8859-1'); | ||
| xhr.onreadystatechange = function () { | ||
| if (callbackCalled) { | ||
| return; | ||
| } | ||
| if (xhr.readyState === 4) { | ||
| callbackCalled = true; | ||
| callback(xhr.responseText); | ||
| } else if (xhr.readyState === 3 && xhr.responseText.length >= limit) { | ||
| callbackCalled = true; | ||
| var res = xhr.responseText; | ||
| xhr.abort(); | ||
| callback(res); | ||
| } | ||
| }; | ||
| let method = postData ? 'POST' : 'GET'; | ||
| xhr.open(method, url, true); | ||
| xhr.setRequestHeader('Range', 'bytes=0-' + limit); // the bytes (incl.) you request | ||
| xhr.send(postData); | ||
| } | ||
|
|
||
| var startCallback; | ||
| var eventFn = function(msg) { | ||
| if (msg.origin !== window.parentOrigin && msg.origin !== window.location.origin && !(msg.origin==="null" && (window.parentOrigin==="file://" || window.location.origin==="file://"))) return; | ||
|
|
||
| var data = msg.data; | ||
| if (Object.prototype.toString.apply(data) !== '[object String]' || !window.JSON) { | ||
| return; | ||
| } | ||
| try { | ||
| data = window.JSON.parse(data) | ||
| } catch(e) { | ||
| data = ''; | ||
| } | ||
|
|
||
| if (data && data.command==="checkParams") { | ||
| data = data.data || {}; | ||
| checkExtendedPDF(data.directUrl, data.key, data.url, data.token, startCallback); | ||
| _unbindWindowEvents(); | ||
| } | ||
| }; | ||
|
|
||
| var _bindWindowEvents = function() { | ||
| if (window.addEventListener) { | ||
| window.addEventListener("message", eventFn, false) | ||
| } else if (window.attachEvent) { | ||
| window.attachEvent("onmessage", eventFn); | ||
| } | ||
| }; | ||
|
|
||
| var _unbindWindowEvents = function() { | ||
| if (window.removeEventListener) { | ||
| window.removeEventListener("message", eventFn) | ||
| } else if (window.detachEvent) { | ||
| window.detachEvent("onmessage", eventFn); | ||
| } | ||
| }; | ||
|
|
||
| function listenApiMsg(callback) { | ||
| startCallback = callback; | ||
| _bindWindowEvents(); | ||
| } |
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