mirror of
https://github.com/kiwix/libkiwix.git
synced 2025-09-08 14:48:25 -04:00
e087f1c82f
Chrome on Android doesn't support displaying PDF documents inline so an attempt to load a PDF into the Kiwix viewer iframe fails in a way that may be confusing to the users. In such situations it is better to offer to the users to download the PDF file so that they can view it with a dedicated application. Making the clicked PDF link to open in a new tab/window achieves exactly that effect.
627 lines
20 KiB
JavaScript
627 lines
20 KiB
JavaScript
// Terminology
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//
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// user url: identifier of the page that has to be displayed in the viewer
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// and that is used as the hash component of the viewer URL. For
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// book resources the user url is {book}/{resource} .
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//
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// iframe url: the URL to be loaded in the viewer iframe.
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let viewerState = {
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uiLanguage: 'en',
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};
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function dropUserLang(query) {
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const q = new URLSearchParams(query);
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q.delete('userlang');
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const pre = (query.startsWith('?') && q.size != 0 ? '?' : '');
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return pre + q.toString();
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}
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function userUrl2IframeUrl(url) {
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if ( url == '' ) {
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return blankPageUrl;
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}
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if ( url.startsWith('search?') ) {
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const q = new URLSearchParams(url.slice("search?".length));
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q.set('userlang', viewerState.uiLanguage);
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return `${root}/search?${q.toString()}`;
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}
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return `${root}/content/${url}`;
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}
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function getBookFromUserUrl(url) {
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if ( url == '' ) {
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return null;
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}
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if ( url.startsWith('search?') ) {
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const p = new URLSearchParams(url.slice("search?".length));
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return p.get('books.name') || p.get('content');
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}
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return url.split('/')[0];
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}
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let currentBook = null;
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let currentBookTitle = null;
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const bookUIGroup = document.getElementById('kiwix_serve_taskbar_book_ui_group');
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const homeButton = document.getElementById('kiwix_serve_taskbar_home_button');
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const contentIframe = document.getElementById('content_iframe');
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function gotoMainPageOfCurrentBook() {
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location.hash = currentBook + '/';
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}
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function gotoUrl(url) {
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contentIframe.src = root + url;
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}
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function gotoRandomPage() {
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gotoUrl(`/random?content=${currentBook}`);
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}
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// URI-encodes only the specified special symbols (note, however, that '%' is
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// always considered a special symbol).
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function quasiUriEncode(s, specialSymbols) {
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if ( specialSymbols.match(/[A-Za-z0-9]/) ) {
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throw "Alphanumeric symbols cannot be special";
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}
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// Set's guarantee of iterating in insertion order ensures that
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// all %s in s will be encoded first.
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for ( const c of new Set('%' + specialSymbols) ) {
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s = s.replaceAll(c, encodeURIComponent(c));
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}
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return s;
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}
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function performSearch() {
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const searchbox = document.getElementById('kiwixsearchbox');
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const q = encodeURIComponent(searchbox.value);
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gotoUrl(`/search?books.name=${currentBook}&pattern=${q}&userlang=${viewerState.uiLanguage}`);
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}
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function makeJSLink(jsCodeString, linkText, linkAttr="") {
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// Values of the href attribute are assumed by the browser to be
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// fully URI-encoded (no matter what the scheme is). Therefore, in
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// order to prevent the browser from decoding any URI-encoded parts
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// in the JS code we have to URI-encode a second time.
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// (see https://stackoverflow.com/questions/33721510)
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const uriEncodedJSCode = encodeURIComponent(jsCodeString);
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const linkPlainText = htmlDecode(linkText, "text/html");
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linkAttr += ` href="javascript:${uriEncodedJSCode}"`;
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linkAttr += ` title="${linkPlainText}"`;
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return `<a ${linkAttr}>${linkText}</a>`;
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}
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function suggestionsApiURL()
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{
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const uriEncodedBookName = encodeURIComponent(currentBook);
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const userLang = viewerState.uiLanguage;
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return `${root}/suggest?userlang=${userLang}&content=${uriEncodedBookName}`;
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}
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function setTitle(element, text) {
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if ( element ) {
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element.title = text;
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if ( element.hasAttribute("aria-label") ) {
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element.setAttribute("aria-label", text);
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}
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}
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}
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function setCurrentBook(book, title) {
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currentBook = book;
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currentBookTitle = title;
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setTitle(homeButton, $t("home-button-text", {BOOK_TITLE: title}));
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homeButton.innerHTML = `<button>${title}</button>`;
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bookUIGroup.style.display = 'inline';
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updateSearchBoxForBookChange();
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}
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function noCurrentBook() {
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currentBook = null;
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currentBookTitle = null;
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bookUIGroup.style.display = 'none';
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updateSearchBoxForBookChange();
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}
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function updateCurrentBookIfNeeded(userUrl) {
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const book = getBookFromUserUrl(userUrl);
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if ( currentBook != book ) {
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updateCurrentBook(book);
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}
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}
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function updateCurrentBook(book) {
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if ( book == null ) {
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noCurrentBook();
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} else {
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fetch(`./raw/${book}/meta/Title`).then(async (resp) => {
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if ( resp.ok ) {
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setCurrentBook(book, await resp.text());
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} else {
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noCurrentBook();
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}
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}).catch((err) => {
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console.log("Error fetching book title: " + err);
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noCurrentBook();
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});
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}
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}
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function iframeUrl2UserUrl(url, query) {
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if ( url == blankPageUrl ) {
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return '';
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}
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if ( url == `${root}/search` ) {
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return `search${dropUserLang(query)}`;
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}
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url = url.slice(root.length);
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return url.split('/').slice(2).join('/');
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}
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function getSearchPattern() {
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const url = window.location.hash.slice(1);
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if ( url.startsWith('search?') ) {
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const p = new URLSearchParams(url.slice("search?".length));
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return p.get("pattern");
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}
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return null;
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}
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let autoCompleteJS = null;
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function closeSuggestions() {
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if ( autoCompleteJS ) {
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autoCompleteJS.close();
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}
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}
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function updateSearchBoxForLocationChange() {
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closeSuggestions();
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document.getElementById("kiwixsearchbox").value = getSearchPattern();
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}
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function updateSearchBoxForBookChange() {
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const searchbox = document.getElementById('kiwixsearchbox');
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const kiwixSearchFormWrapper = document.querySelector('.kiwix_searchform');
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if ( currentBookTitle ) {
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searchbox.title = $t("searchbox-tooltip", {BOOK_TITLE : currentBookTitle});
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searchbox.placeholder = searchbox.title;
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searchbox.setAttribute("aria-label", searchbox.title);
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kiwixSearchFormWrapper.style.display = 'inline';
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} else {
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kiwixSearchFormWrapper.style.display = 'none';
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}
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}
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let previousScrollTop = Infinity;
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function updateToolbarVisibilityState() {
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const iframeDoc = contentIframe.contentDocument;
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const st = iframeDoc.documentElement.scrollTop || iframeDoc.body.scrollTop;
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if ( Math.abs(previousScrollTop - st) <= 5 )
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return;
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const kiwixToolBar = document.querySelector('#kiwixtoolbar');
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if (st > previousScrollTop) {
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kiwixToolBar.style.position = 'fixed';
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kiwixToolBar.style.top = '-100%';
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} else {
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kiwixToolBar.style.position = 'static';
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kiwixToolBar.style.top = '0';
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}
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previousScrollTop = st;
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}
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function handle_visual_viewport_change() {
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const wh = window.visualViewport
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? window.visualViewport.height
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: window.innerHeight;
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contentIframe.height = wh - contentIframe.offsetTop - 4;
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}
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function setIframeUrl(path) {
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try {
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// Don't do anything if we are already at the requested URL.
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// This is needed to break the infinite ping-pong played by
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// handle_location_hash_change() and handle_content_url_change()
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// (when either top-window or content window/iframe URL changes the other
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// one is updated too).
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if ( path == contentIframe.contentWindow.location.pathname )
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return;
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} catch ( error ) {
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// This happens in Firefox when a PDF file is displayed in the iframe
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// (sandboxing of the iframe content and cross-origin mismatch with the
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// builtin PDF viewer result in preventing access to the attributes of
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// contentIframe.contentWindow.location).
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// Fall through and load the requested URL.
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}
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contentIframe.contentWindow.location.replace(path);
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}
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function handle_location_hash_change() {
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const hash = window.location.hash.slice(1);
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console.log("handle_location_hash_change: " + hash);
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updateCurrentBookIfNeeded(hash);
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setIframeUrl(userUrl2IframeUrl(hash));
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updateSearchBoxForLocationChange();
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previousScrollTop = Infinity;
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history.replaceState(viewerState, null);
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}
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function translateErrorPageIfNeeded() {
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const cw = contentIframe.contentWindow;
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if ( cw.KIWIX_RESPONSE_TEMPLATE && cw.KIWIX_RESPONSE_DATA ) {
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const template = htmlDecode(cw.KIWIX_RESPONSE_TEMPLATE);
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// cw.KIWIX_RESPONSE_DATA belongs to the iframe context and running
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// I18n.render() on it directly in the top context doesn't work correctly
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// because the type checks (obj.__proto__ == ???.prototype) in
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// I18n.instantiateParameterizedMessages() always fail (String.prototype
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// refers to different objects in different contexts).
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// Work arround that issue by copying the object into our context.
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const params = JSON.parse(JSON.stringify(cw.KIWIX_RESPONSE_DATA));
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const html = I18n.render(template, params);
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const htmlDoc = new DOMParser().parseFromString(html, "text/html");
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cw.document.documentElement.innerHTML = htmlDoc.documentElement.innerHTML;
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}
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}
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function handle_content_url_change() {
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const iframeLocation = contentIframe.contentWindow.location;
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console.log('handle_content_url_change: ' + iframeLocation.href);
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document.title = contentIframe.contentDocument.title;
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const iframeContentUrl = iframeLocation.pathname;
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const iframeContentQuery = iframeLocation.search;
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const newHash = iframeUrl2UserUrl(iframeContentUrl, iframeContentQuery);
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history.replaceState(viewerState, null, makeURL(location.search, newHash));
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updateCurrentBookIfNeeded(newHash);
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translateErrorPageIfNeeded();
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};
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////////////////////////////////////////////////////////////////////////////////
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// External link blocking
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////////////////////////////////////////////////////////////////////////////////
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function matchingAncestorElement(el, context, selector) {
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while (el && el.matches && el !== context) {
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if ( el.matches(selector) )
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return el;
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el = el.parentElement;
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}
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return null;
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}
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const block_path = `${root}/catch/external`;
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function blockLink(url) {
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return viewerSettings.linkBlockingEnabled
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? block_path + "?source=" + encodeURIComponent(url)
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: url;
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}
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function urlMustBeHandledByAnExternalApp(url) {
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const WHITELISTED_URL_SCHEMATA = ['http:', 'https:', 'about:', 'javascript:'];
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return WHITELISTED_URL_SCHEMATA.indexOf(url.protocol) == -1;
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}
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function isExternalUrl(url) {
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if ( url.startsWith(window.location.origin) )
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return false;
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return url.startsWith("//")
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|| url.startsWith("http:")
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|| url.startsWith("https:");
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}
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function getRealHref(target) {
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// In case of wombat in the middle, wombat will rewrite the href value to the original url (external link)
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// This is not what we want. Let's ask wombat to not rewrite href
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const old_no_rewrite = target._no_rewrite;
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target._no_rewrite = true;
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const target_href = target.href;
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target._no_rewrite = old_no_rewrite;
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return target_href;
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}
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function setHrefAvoidingWombatRewriting(target, url) {
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const old_no_rewrite = target._no_rewrite;
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target._no_rewrite = true;
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target.setAttribute("href", url);
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target._no_rewrite = old_no_rewrite;
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}
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function linkShouldBeOpenedInANewWindow(linkElement, mouseEvent) {
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return linkElement.getAttribute("target") == "_blank"
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|| mouseEvent.ctrlKey
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|| mouseEvent.shiftKey
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|| mouseEvent.metaKey /* on Macs */;
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}
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function goingToOpenALinkToAnUndisplayableResource(url) {
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return !navigator.pdfViewerEnabled && url.pathname.endsWith('.pdf');
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}
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function onClickEvent(e) {
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const iframeDocument = contentIframe.contentDocument;
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const target = matchingAncestorElement(e.target, iframeDocument, "a");
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if (target !== null && "href" in target) {
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const target_href = getRealHref(target);
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const target_url = new URL(target_href, iframeDocument.location);
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const isExternalAppUrl = urlMustBeHandledByAnExternalApp(target_url);
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if ( (isExternalAppUrl && !viewerSettings.linkBlockingEnabled)
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|| goingToOpenALinkToAnUndisplayableResource(target_url) ) {
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target.setAttribute("target", "_blank");
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}
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if (isExternalAppUrl || isExternalUrl(target_href)) {
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const possiblyBlockedLink = blockLink(target_href);
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if ( linkShouldBeOpenedInANewWindow(target, e) ) {
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// The link will be loaded in a new tab/window - update the link
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// and let the browser handle the rest.
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setHrefAvoidingWombatRewriting(target, possiblyBlockedLink);
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} else {
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// Load the external URL in the viewer window (rather than iframe)
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contentIframe.contentWindow.parent.location = possiblyBlockedLink;
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e.preventDefault();
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}
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}
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}
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}
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// helper for enabling IE 8 event bindings
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function addEventHandler(el, eventType, handler) {
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if (el.attachEvent)
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el.attachEvent('on'+eventType, handler);
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else
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el.addEventListener(eventType, handler);
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}
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function setupEventHandler(context, selector, eventType, callback) {
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addEventHandler(context, eventType, function(e) {
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const eventElement = e.target || e.srcElement;
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const el = matchingAncestorElement(eventElement, context, selector);
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if (el)
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callback.call(el, e);
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});
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}
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// matches polyfill
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this.Element && function(ElementPrototype) {
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ElementPrototype.matches = ElementPrototype.matches ||
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ElementPrototype.matchesSelector ||
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ElementPrototype.webkitMatchesSelector ||
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ElementPrototype.msMatchesSelector ||
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function(selector) {
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var node = this, nodes = (node.parentNode || node.document).querySelectorAll(selector), i = -1;
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while (nodes[++i] && nodes[i] != node);
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return !!nodes[i];
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}
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}(Element.prototype);
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function setup_external_link_blocker() {
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setupEventHandler(contentIframe.contentDocument, 'a', 'click', onClickEvent);
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}
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////////////////////////////////////////////////////////////////////////////////
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// End of external link blocking
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////////////////////////////////////////////////////////////////////////////////
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let viewerSetupComplete = false;
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function on_content_load() {
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if ( viewerSetupComplete ) {
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handle_content_url_change();
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}
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setup_external_link_blocker();
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}
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function htmlDecode(input) {
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var doc = new DOMParser().parseFromString(input, "text/html");
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return doc.documentElement.textContent;
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}
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function setupAutoHidingOfTheToolbar() {
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setInterval(updateToolbarVisibilityState, 250);
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}
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function setupSuggestions() {
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const kiwixSearchBox = document.querySelector('#kiwixsearchbox');
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const kiwixSearchFormWrapper = document.querySelector('.kiwix_searchform');
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autoCompleteJS = new autoComplete(
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{
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selector: "#kiwixsearchbox",
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placeHolder: kiwixSearchBox.title,
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threshold: 1,
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debounce: 300,
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data : {
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src: async (query) => {
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try {
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// Fetch Data from external Source
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const source = await fetch(`${suggestionsApiURL()}&term=${encodeURIComponent(query)}`);
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const data = await source.json();
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return data;
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} catch (error) {
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return error;
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}
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},
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keys: ['label'],
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},
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submit: true,
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searchEngine: (query, record) => {
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// We accept all records
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return true;
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},
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resultsList: {
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noResults: true,
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// We must display 10 results (requested) + 1 potential link to do a full text search.
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maxResults: 11,
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},
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resultItem: {
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element: (item, data) => {
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const uriEncodedBookName = encodeURIComponent(currentBook);
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let url;
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if (data.value.kind == "path") {
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// The double quote and backslash symbols are included in the list
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// of special symbols to URI-encode so that the resulting URL can
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// be safely quoted inside a dynamically executed piece of
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// Javascript code a few lines later.
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const path = htmlDecode(data.value.path);
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const quasiUriEncodedPath = quasiUriEncode(path, '#?"\\');
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url = `/content/${uriEncodedBookName}/${quasiUriEncodedPath}`;
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} else {
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const pattern = encodeURIComponent(htmlDecode(data.value.value));
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url = `/search?content=${uriEncodedBookName}&pattern=${pattern}`;
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}
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// url can't contain any double quote and/or backslash symbols
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// since they should have been URI-encoded. Therefore putting it
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// inside double quotes should result in valid javascript.
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const jsAction = `gotoUrl("${url}")`;
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const linkText = htmlDecode(data.value.label);
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item.innerHTML = makeJSLink(jsAction, linkText, 'class="suggest"');
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},
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highlight: "autoComplete_highlight",
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selected: "autoComplete_selected"
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}
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}
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);
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document.querySelector('#kiwixsearchform').addEventListener('submit', function(event) {
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closeSuggestions();
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try {
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const selectedElem = document.querySelector('.autoComplete_selected > a');
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if (selectedElem) {
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event.preventDefault();
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selectedElem.click();
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}
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} catch (err) {}
|
|
});
|
|
|
|
kiwixSearchBox.addEventListener('focus', () => {
|
|
kiwixSearchFormWrapper.classList.add('full_width');
|
|
document.querySelector('label[for="kiwix_button_show_toggle"]').classList.add('searching');
|
|
document.querySelector('.kiwix_button_cont').classList.add('searching');
|
|
});
|
|
kiwixSearchBox.addEventListener('blur', () => {
|
|
kiwixSearchFormWrapper.classList.remove('full_width');
|
|
document.querySelector('label[for="kiwix_button_show_toggle"]').classList.remove('searching');
|
|
document.querySelector('.kiwix_button_cont').classList.remove('searching');
|
|
});
|
|
}
|
|
|
|
function makeURL(search, hash) {
|
|
let url = location.origin + location.pathname;
|
|
if (search != "") {
|
|
url += (search[0] == '?' ? search : '?' + search);
|
|
}
|
|
|
|
url += (hash[0] == '#' ? hash : '#' + hash);
|
|
return url;
|
|
}
|
|
|
|
function updateUILanguageSelector(userLang) {
|
|
console.log(`updateUILanguageSelector(${userLang})`);
|
|
const languageSelector = document.getElementById("ui_language");
|
|
for (const opt of languageSelector.children ) {
|
|
if ( opt.value == userLang ) {
|
|
opt.selected = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
function handle_history_state_change(event) {
|
|
console.log(`handle_history_state_change`);
|
|
if ( event.state ) {
|
|
viewerState = event.state;
|
|
updateUILanguageSelector(viewerState.uiLanguage);
|
|
setUserLanguage(viewerState.uiLanguage, updateUIText);
|
|
}
|
|
}
|
|
|
|
function changeUILanguage() {
|
|
window.modalUILanguageSelector.close();
|
|
const s = document.getElementById("ui_language");
|
|
const lang = s.options[s.selectedIndex].value;
|
|
viewerState.uiLanguage = lang;
|
|
setUserLanguage(lang, () => {
|
|
updateUIText();
|
|
translateErrorPageIfNeeded();
|
|
history.pushState(viewerState, null);
|
|
});
|
|
}
|
|
|
|
function setupViewer() {
|
|
// Defer the call of handle_visual_viewport_change() until after the
|
|
// presence or absence of the taskbar as determined by this function
|
|
// has been settled.
|
|
setTimeout(handle_visual_viewport_change, 0);
|
|
|
|
window.onresize = handle_visual_viewport_change;
|
|
|
|
const kiwixToolBarWrapper = document.getElementById('kiwixtoolbarwrapper');
|
|
if ( ! viewerSettings.toolbarEnabled ) {
|
|
return;
|
|
}
|
|
|
|
const lang = getUserLanguage();
|
|
setUserLanguage(lang, finishViewerSetupOnceTranslationsAreLoaded);
|
|
viewerState.uiLanguage = lang;
|
|
const cleanedUpQuery = dropUserLang(window.location.search);
|
|
const rewrittenURL = makeURL(cleanedUpQuery, location.hash);
|
|
history.replaceState(viewerState, null, rewrittenURL);
|
|
|
|
kiwixToolBarWrapper.style.display = 'block';
|
|
if ( ! viewerSettings.libraryButtonEnabled ) {
|
|
document.getElementById("kiwix_serve_taskbar_library_button").remove();
|
|
}
|
|
|
|
initUILanguageSelector(viewerState.uiLanguage, changeUILanguage);
|
|
setupSuggestions();
|
|
|
|
// cybook hack
|
|
if (navigator.userAgent.indexOf("bookeen/cybook") != -1) {
|
|
document.querySelector('html').classList.add('cybook');
|
|
}
|
|
|
|
if (document.body.clientWidth < 520) {
|
|
setupAutoHidingOfTheToolbar();
|
|
}
|
|
}
|
|
|
|
function updateUIText() {
|
|
currentBook = getBookFromUserUrl(location.hash.slice(1));
|
|
updateCurrentBook(currentBook);
|
|
|
|
setTitle(document.getElementById("kiwix_serve_taskbar_library_button"),
|
|
$t("library-button-text"));
|
|
|
|
setTitle(document.getElementById("kiwix_serve_taskbar_random_button"),
|
|
$t("random-page-button-text"));
|
|
}
|
|
|
|
function finishViewerSetupOnceTranslationsAreLoaded()
|
|
{
|
|
updateUIText();
|
|
handle_location_hash_change();
|
|
|
|
window.onhashchange = handle_location_hash_change;
|
|
window.onpopstate = handle_history_state_change;
|
|
|
|
viewerSetupComplete = true;
|
|
}
|