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savepage.js
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savepage.js
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/*
* Copyright © 2010 Eugeniy Meshcheryakov <eugen@debian.org>
*
* This file is licensed under GNU LGPL version 3 or later.
* See file LGPL-3 for details. This is the script run on pages reproduced on an
* already saved HTML file...
*/
function makeDataUrl(contentType, data) {
return 'data:' + contentType + ';base64,' + toBase64(data);
}
function makeDataUrlFromUTF8(contentType, data) {
return makeDataUrl(contentType, unescape(encodeURIComponent(data)));
}
function DocumentSaver() {
this.cloneRoot = null; // Root of the cloned document
this.stylesheets = [];
//this.params = params_t;
/*
* Add meta tag with HTML content type and encoding set to UTF-8
*/
this.addMetaTag = function() {
var head = this.cloneRoot.getElementsByTagName('head')[0];
if (!head) {
// FIXME should never happen
console.error('HTML document without <head>');
return;
}
var meta = this.doc.createElement('meta');
meta.httpEquiv = 'Content-Type';
meta.content = 'text/html; charset=utf-8';
head.appendChild(meta);
}
this.processLink = function(clone, elem) {
switch (elem.rel.toLowerCase()) {
case 'stylesheet':
return;
}
clone.appendChild(elem.cloneNode(false));
}
/* ============== Element processing funtcions ========================== */
/*
* for <a> and <area>
* Converts URLs to absolute if they are nonlocal.
* FIX ME Avoid XSS..
*/
// for <a> and <area>
this.processAnchor = function(clone, elem) {
var newClone = elem.cloneNode(false);
var href = elem.getAttribute('href');
/* convert href to an absolute url, if it does not point to current page */
if (href && (href[0] != '#')) newClone.href = elem.href;
clone.appendChild(newClone);
return newClone;
}
this.processImage = function(clone, elem) {
var newClone = elem.cloneNode(false);
var url = elem.src;
newClone.url = url; // convert to absolute for now
console.log('Image url: ' + url);
clone.appendChild(newClone);
}
/* FIXME this does not work on images.google.com and maybe others
this.processCanvas = function(clone, elem) {
var newClone = document.createElement('img');
// copy all attributes from canvas, FIXME should be ok?
var attrs = elem.attributes;
for (var i = 0; i < attrs.length; i++)
newClone.setAttribute(attrs[i].name, attrs[i].value); // FIXME or textValue? what about namespace?
// and save the data itself
try {
newClone.src = elem.toDataURL();
}
catch (e) {
console.error(e.message);
}
clone.appendChild(newClone);
}
*/
/*
* Process meta elements
* Removes attributes that can conflict with correct saving/restoring
*/
this.processMeta = function(clone, elem) {
if (elem.httpEquiv &&
(elem.httpEquiv.toLowerCase() == 'refresh' ||
elem.httpEquiv.toLowerCase() == 'content-type'))
return;
var newClone = elem.cloneNode(false);
clone.appendChild(newClone);
return newClone;
}
//We already processed all the i frames...
this.processFrame = function(clone, elem) {
var newClone = elem.cloneNode(false);
// TODO convert src to absolute
/*if (elem.contentDocument) {
var frameSaver = new DocumentSaver();
frameSaver.processDocument(elem.contentDocument,
function(clone) {
var newURL = makeDataUrlFromUTF8('text/html; charset=utf-8',
new XMLSerializer().serializeToString(clone));
newClone.src = newURL;
});
}
else
console.error('iframe without contentDocument');*/
clone.appendChild(newClone);
return newClone;
}
/*
* Process an HTML element and it's children.
* Parameters:
* clone - clone of the parent element
* elem - current element (in original document)
*/
this.processElement = function(clone, elem) {
var newClone = null;
switch (elem.nodeName.toLowerCase()) {
case 'link':
//All links node were already processed...and removed...
return;
case 'area':
case 'a':
newClone = this.processAnchor(clone, elem);
break;
case 'img':
this.processImage(clone, elem);
break;
/* FIXME does not work
case 'canvas':
processCanvas(clone,elem);
return;
*/
case 'style':
newClone = elem.cloneNode(false);
clone.appendChild(newClone);
break;
case 'script':
/* ignore, it will not work in many cases */
return;
case 'meta':
newClone = this.processMeta(clone, elem);
break;
case 'div':
if((elem.id && elem.id.toString().trim()== 'sbsite-bottom-bar') || elem.id.trim()=='sbnotes5832'){
return;
}
case 'iframe':
case 'frame':
newClone = this.processFrame(clone, elem);
break;
default:
newClone = elem.cloneNode(false);
clone.appendChild(newClone);
}
if (newClone != null) {
for (var child = elem.firstChild; child != null; child = child.nextSibling)
this.processRecursive(newClone, child);
}
}
this.processRecursive = function(clone, node) {
switch (node.nodeType) {
case node.TEXT_NODE:
case node.CDATA_SECTION_NODE:
clone.appendChild(node.cloneNode(false));
break;
case node.COMMENT_NODE:
/* ignore */
break;
case node.ELEMENT_NODE:
this.processElement(clone, node);
break;
default:
console.log('Unhandled node: ' + node);
break; /* TODO */
}
}
this.processDoc = function(clone, node) {
for (var child = node.firstChild; child != null; child = child.nextSibling)
this.processRecursive(clone, child);
}
this.processStyleSheet = function(styleSheet) {
// XXX See issues 45786 and 49001
if (!styleSheet.cssRules) {
console.warn('Empty cssRules. Saved page will look incorrect.');
return '';
}
var rules = [];
for (var i = 0; i < styleSheet.cssRules.length; i++) {
var rule = styleSheet.cssRules[i];
if (rule.type == rule.IMPORT_RULE) {
rules.push(this.processStyleSheet(rule.styleSheet));
} else if (rule.type == rule.CHARSET_RULE) {
// ignore
} else {
rules.push(rule.cssText);
}
}
return rules.join('\n');
}
/*
* Process document inlining images/stylesheets/etc.. and removing scripts.
*/
this.processDocument = function(doc, callback) {
this.doc = doc;
this.callback = callback;
var rootNode = this.doc.getElementsByTagName('html')[0];
if (!rootNode) {
console.error("No html node in document");
return;
}
this.cloneRoot = rootNode.cloneNode(false);
this.processDoc(this.cloneRoot, rootNode);
//
this.addMetaTag();
this.callback(this.cloneRoot);
}
}