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iframe_zip_loader.js
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iframe_zip_loader.js
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// Copyright (c) 2014 Readium Foundation and/or its licensees. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// 3. Neither the name of the organization nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
define(['URIjs', 'readium_shared_js/views/iframe_loader', 'underscore', './discover_content_type', 'bowser'], function(URI, IFrameLoader, _, ContentTypeDiscovery, bowser) {
var zipIframeLoader = function( getCurrentResourceFetcher, contentDocumentTextPreprocessor) {
var isIE = (window.navigator.userAgent.indexOf("Trident") > 0 || window.navigator.userAgent.indexOf("Edge") > 0);
var basicIframeLoader = new IFrameLoader();
var self = this;
var _contentDocumentTextPreprocessor = contentDocumentTextPreprocessor;
this.addIFrameEventListener = function (eventName, callback, context) {
basicIframeLoader.addIFrameEventListener(eventName, callback, context);
};
this.updateIframeEvents = function (iframe) {
basicIframeLoader.updateIframeEvents(iframe);
};
this.loadIframe = function(iframe, src, callback, caller, attachedData) {
if (!iframe.baseURI) {
if (isIE && iframe.ownerDocument.defaultView.frameElement) {
//console.debug(iframe.ownerDocument.defaultView.location);
iframe.baseURI = iframe.ownerDocument.defaultView.frameElement.getAttribute("data-loadUri");
console.log("EPUB doc iframe src (BEFORE):");
console.log(src);
src = new URI(src).absoluteTo(iframe.baseURI).search('').hash('').toString();
}
else if (typeof location !== 'undefined') {
iframe.baseURI = location.href + "";
}
console.error("!iframe.baseURI => " + iframe.baseURI);
}
console.log("EPUB doc iframe src:");
console.log(src);
iframe.setAttribute("data-src", src);
console.log("EPUB doc iframe base URI:");
console.log(iframe.baseURI);
iframe.setAttribute("data-baseUri", iframe.baseURI);
var loadedDocumentUri = new URI(src).absoluteTo(iframe.baseURI).search('').hash('').toString();
console.log("EPUB doc iframe LOAD URI:");
console.log(loadedDocumentUri);
iframe.setAttribute("data-loadUri", loadedDocumentUri);
var shouldConstructDomProgrammatically = getCurrentResourceFetcher().shouldConstructDomProgrammatically();
if (shouldConstructDomProgrammatically) {
console.log("shouldConstructDomProgrammatically...");
getCurrentResourceFetcher().fetchContentDocument(attachedData, loadedDocumentUri,
function (resolvedContentDocumentDom) {
self._loadIframeWithDocument(iframe,
attachedData,
resolvedContentDocumentDom.documentElement.outerHTML,
function () {
callback.call(caller, true, attachedData);
});
}, function (err) {
callback.call(caller, false, attachedData);
}
);
} else {
fetchContentDocument(loadedDocumentUri, function (contentDocumentHtml) {
if (!contentDocumentHtml) {
//failed to load content document
callback.call(caller, false, attachedData);
} else {
self._loadIframeWithDocument(iframe, attachedData, contentDocumentHtml, function () {
callback.call(caller, true, attachedData);
});
}
});
}
};
this._loadIframeWithDocument = function (iframe, attachedData, contentDocumentData, callback) {
var documentDataUri, blob;
var chromeIOS = bowser.ios && bowser.chrome;
// IE and Safari 6 for iOS don't handle Blobs correctly
// Chrome on iOS fails to access iframe.contentWindow with BlobURI and data URL :(
var isBlobHandled = !chromeIOS // fallback to srcdoc
&& !bowser.msie
&& !(bowser.ios && (parseInt(bowser.version, 10) < 7))
&& !bowser.samsungBrowser;
if (isBlobHandled) {
var contentType = 'text/html';
if (attachedData.spineItem.media_type && attachedData.spineItem.media_type.length) {
contentType = attachedData.spineItem.media_type;
}
// prefer BlobBuilder as some browser supports Blob constructor but fails using it
if (window.BlobBuilder) {
var builder = new BlobBuilder();
builder.append(contentDocumentData);
blob = builder.getBlob(contentType);
} else {
blob = new Blob([contentDocumentData], {'type': contentType});
}
documentDataUri = window.URL.createObjectURL(blob);
//Chrome on iOS:
//data URL as substitute to BlobURI ... still iframe.contentWindow silent crash :(
// var reader = new FileReader();
// reader.onload = function(e){
// documentDataUri = reader.result;
// iframe.setAttribute("src", documentDataUri);
// // iframe.src = documentDataUri;
// }
// reader.readAsDataURL(blob);
} else if (!chromeIOS) {
// Note that this does not support CSS selectors with XHTML namespaces (e.g. epub:type)
iframe.contentWindow.document.open();
// Currently not handled automatically by winstore-jscompat,
// so we're doing it manually. See:
// https://github.com/MSOpenTech/winstore-jscompat/
if (window.MSApp && window.MSApp.execUnsafeLocalFunction) {
window.MSApp.execUnsafeLocalFunction(function() {
iframe.contentWindow.document.write(contentDocumentData);
});
} else {
iframe.contentWindow.document.write(contentDocumentData);
}
}
iframe.onload = function () {
var doc = iframe.contentDocument || iframe.contentWindow.document;
// $('iframe', doc).each(function(i, child_iframe){
// console.debug(child_iframe);
// console.log(child_iframe.attr("data-src"));
// });
if (iframe.contentWindow.frames) {
for (var i = 0; i < iframe.contentWindow.frames.length; i++) {
var child_iframe = iframe.contentWindow.frames[i];
// console.debug(child_iframe);
// console.log(child_iframe.frameElement.baseURI);
// console.log(child_iframe.location);
var childSrc = undefined;
try{
childSrc = child_iframe.frameElement.getAttribute("data-src");
} catch(err) {
// HTTP(S) cross-origin access?
console.warn(err);
continue;
}
// console.log(childSrc);
if (!childSrc) {
if (child_iframe.frameElement.localName == "iframe") {
console.error("IFRAME data-src missing?!");
}
continue;
}
// console.debug(attachedData);
var contentDocumentPathRelativeToPackage = attachedData.spineItem.href;
var publicationFetcher = getCurrentResourceFetcher();
var contentDocumentPathRelativeToBase = publicationFetcher.convertPathRelativeToPackageToRelativeToBase(contentDocumentPathRelativeToPackage);
// console.log("contentDocumentPathRelativeToBase: " + contentDocumentPathRelativeToBase);
var refAttrOrigVal_RelativeToBase = (new URI(childSrc)).absoluteTo(contentDocumentPathRelativeToBase).toString();
// console.log("refAttrOrigVal_RelativeToBase: " + refAttrOrigVal_RelativeToBase);
var packageFullPath = publicationFetcher.getPackageFullPathRelativeToBase();
// console.log("packageFullPath: " + packageFullPath);
var refAttrOrigVal_RelativeToPackage = (new URI("/"+refAttrOrigVal_RelativeToBase)).relativeTo("/"+packageFullPath).toString();
// console.log("refAttrOrigVal_RelativeToPackage: " + refAttrOrigVal_RelativeToPackage);
var mimetype = ContentTypeDiscovery.identifyContentTypeFromFileName(refAttrOrigVal_RelativeToPackage);
var childIframeLoader = new zipIframeLoader(getCurrentResourceFetcher, contentDocumentTextPreprocessor);
childIframeLoader.loadIframe(
child_iframe.frameElement,
childSrc,
function() {
console.log("CHILD IFRAME LOADED.");
},
self,
{
spineItem:
{
media_type: mimetype, //attachedData.spineItem.media_type,
href: refAttrOrigVal_RelativeToPackage
}
}
);
}
}
$('svg', doc).on("load", function(){
console.log('SVG loaded');
});
self.updateIframeEvents(iframe);
var mathJax = iframe.contentWindow.MathJax;
if (mathJax) {
console.log("MathJax VERSION: " + mathJax.cdnVersion + " // " + mathJax.fileversion + " // " + mathJax.version);
var useFontCache = true; // default in MathJax
// Firefox fails to render SVG otherwise
if (mathJax.Hub.Browser.isFirefox) {
useFontCache = false;
}
// Chrome 49+ fails to render SVG otherwise
// https://github.com/readium/readium-js/issues/138
if (mathJax.Hub.Browser.isChrome) {
useFontCache = false;
}
// Edge fails to render SVG otherwise
// https://github.com/readium/readium-js-viewer/issues/394#issuecomment-185382196
if (window.navigator.userAgent.indexOf("Edge") > 0) {
useFontCache = false;
}
mathJax.Hub.Config({showMathMenu:false, messageStyle: "none", showProcessingMessages: true, SVG:{useFontCache:useFontCache}});
// If MathJax is being used, delay the callback until it has completed rendering
var mathJaxCallback = _.once(callback);
try {
mathJax.Hub.Queue(mathJaxCallback);
} catch (err) {
console.error("MathJax fail!");
callback();
}
// Or at an 8 second timeout, which ever comes first
// window.setTimeout(mathJaxCallback, 8000);
} else {
callback();
}
if (isBlobHandled) {
window.URL.revokeObjectURL(documentDataUri);
}
};
if (isBlobHandled) {
iframe.setAttribute("src", documentDataUri);
} else if (!chromeIOS) {
iframe.contentWindow.document.close();
} else { // chromeIOS
iframe.setAttribute("srcdoc", contentDocumentData);
}
};
function fetchHtmlAsText(path, callback) {
$.ajax({
url: path,
dataType: 'html',
async: true,
success: function (result) {
callback(result);
},
error: function (xhr, status, errorThrown) {
console.error('Error when AJAX fetching ' + path);
console.error(status);
console.error(errorThrown);
callback();
}
});
}
function fetchContentDocument(src, callback) {
fetchHtmlAsText(src, function (contentDocumentHtml) {
if (!contentDocumentHtml) {
callback();
return;
}
if (_contentDocumentTextPreprocessor) {
contentDocumentHtml = _contentDocumentTextPreprocessor(src, contentDocumentHtml);
}
callback(contentDocumentHtml);
});
}
};
return zipIframeLoader;
});