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// vim: set ts=4 sw=4:
/*
* @file htmlview.c htmlview reader mode switching and CSS handling
*
* Copyright (C) 2021-2023 Lars Windolf <lars.windolf@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
function setBase(uri) {
var base = document.createElement("base");
base.setAttribute("href", uri);
document.head.appendChild(base);
}
/**
* loadContent() will be run on each internal / Readability.js rendering
*
* This method can be called multiple times for a single rendering, so it
* needs to be idempotent on what is done. Primary use case for this is
* when in internal browser + reader mode we first render layout with parameter
* content being empty, while asynchronously downloading content. Once the
* download finishes loadContent() is called again with the actual content
* which is then inserted in the layout.
*
* @returns: false if loading with reader failed (true otherwise)
*/
function loadContent(readerEnabled, content) {
var internalBrowsing = false;
if (false == readerEnabled) {
if (document.location.href === 'liferea://') {
console.log('[liferea] reader mode is off');
document.body.innerHTML = decodeURIComponent(content);
} else {
console.log('[liferea] reader mode off for website');
}
}
if (true == readerEnabled) {
try {
console.log('[liferea] reader mode is on');
var documentClone = document.cloneNode(true);
// When we are internally browsing than we need basic
// structure to insert Reader mode content
if (document.getElementById('content') !== null) {
internalBrowsing = true;
console.log('[liferea] adding <div id="content"> for website content');
document.body.innerHTML += '<div id=\"content\"></div>';
}
// Decide where we get the content from
if (document.location.href === 'liferea://') {
// Add all content in shadow DOM and split decoration from content
// only pass the content to Readability.js
console.log('[liferea] load content passed by variable');
content = decodeURIComponent(content);
} else {
console.log('[liferea] using content from original document');
content = document.documentElement.innerHTML;
}
// Add content to clone doc as input for Readability.js
documentClone.body.innerHTML = content;
// When we run with internal URI schema we get layout AND content
// from variable and split it, apply layout to document
// and copy content to documentClone
if (document.location.href === 'liferea://' && documentClone.getElementById('content') != null) {
documentClone.getElementById('content').innerHTML = '';
document.body.innerHTML = documentClone.body.innerHTML;
documentClone.body.innerHTML = content;
documentClone.body.innerHTML = documentClone.getElementById('content').innerHTML;
}
try {
if (!isProbablyReaderable(documentClone))
throw "notreaderable";
// Show the results
// Kill all foreign styles
var links = document.querySelectorAll('link');
for (var l of links) {
l.parentNode.removeChild(l);
}
var styles = document.querySelectorAll('style');
for (var s of styles) {
s.parentNode.removeChild(s);
}
var article = new Readability(documentClone, {
charThreshold: 25
}).parse();
if (!article)
throw "noarticle";
document.getElementById('content').innerHTML = article.content;
} catch (e) {
console.log('[liferea] reader mode not possible (' + e + ')! fallback to unfiltered content');
if (internalBrowsing)
document.getElementById('content').innerHTML = "Reader mode not possible. Loading URL unfiltered..."; // FIXME: provide good error info
else
document.body.innerHTML = content;
return false;
}
// Kill all foreign styles
var links = document.querySelectorAll('link');
for (var l of links) {
l.parentNode.removeChild(l);
}
var styles = document.querySelectorAll('style');
for (var s of styles) {
s.parentNode.removeChild(s);
}
} catch (e) {
console.log('[liferea] reader mode failed: ' + e);
if (!internalBrowsing) {
// Force load original document at top level to get rid of all decoration
document.documentElement.innerHTML = content;
} else {
document.getElementById('content').innerHTML = "Reader mode failed. Loading URL unfiltered...";
return false;
}
}
}
// Run DOMPurify
content = document.getElementById('content').innerHTML;
document.getElementById('content').innerHTML = DOMPurify.sanitize(content);
// Fix inline SVG sizes
const svgMinWidth = 50;
document.getElementById('content')
.querySelectorAll('svg')
.forEach((el) => {
const h = el.getAttribute('height');
const w = el.getAttribute('width');
if(h && w) {
if(w < svgMinWidth)
el.parentNode.removeChild(el);
return;
}
const viewbox = el.getAttribute('viewBox');
if(!viewbox)
return;
const size = viewbox.split(/\s+/);
if(size.length != 4)
return;
// Drop smaller SVGs that are usually just layout decorations
if((size[2] - size[0]) < svgMinWidth) {
el.parentNode.removeChild(el);
return;
}
// Properly size larger SVGs
el.width = size[2] - size[0];
el.heigth = size[3] - size[1];
});
// Drop empty elements (to get rid of empty picture/video/iframe divs)
const emptyRegex = new RegExp("^\s*$");
document.getElementById('content')
.querySelectorAll(":only-child")
.forEach((el) => {
if(el.innerHTML.length == 1)
el.parentNode.removeChild(el);
});
// Setup audio/video <select> handler
document.querySelector('#enclosureVideo select')?.addEventListener("change", (e) => {
document.querySelector('#enclosureVideo video').src = e.target.options[e.target.selectedIndex].value;
document.querySelector('#enclosureVideo video').play();
});
document.getElementById('#enclosureAudio select')?.addEventListener("change", (e) => {
document.querySelector('#enclosureAudio audio').src = e.target.options[e.target.selectedIndex].value;
document.querySelector('#enclosureVideo audio').play();
});
return true;
}
function youtube_embed(id) {
var container = document.getElementById(id);
container.innerHTML = '<iframe width="640" height="480" src="https://www.youtube.com/embed/' + id + '?autoplay=1" frameborder="0" allowfullscreen="1" allow="autoplay; allowfullscreen"></iframe>';
return false;
}
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