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import {defer, isXml, parse} from "./utils/core";
import request from "./utils/request";
import mime from "./utils/mime";
import Path from "./utils/path";
import JSZip from "jszip/dist/jszip";
/**
* Handles Unzipping a requesting files from an Epub Archive
* @class
*/
class Archive {
constructor() {
this.zip = undefined;
this.urlCache = {};
this.checkRequirements();
}
/**
* Checks to see if JSZip exists in global namspace,
* Requires JSZip if it isn't there
* @private
*/
checkRequirements(){
try {
this.zip = new JSZip();
} catch (e) {
throw new Error("JSZip lib not loaded");
}
}
/**
* Open an archive
* @param {binary} input
* @param {boolean} [isBase64] tells JSZip if the input data is base64 encoded
* @return {Promise} zipfile
*/
open(input, isBase64){
return this.zip.loadAsync(input, {"base64": isBase64});
}
/**
* Load and Open an archive
* @param {string} zipUrl
* @param {boolean} [isBase64] tells JSZip if the input data is base64 encoded
* @return {Promise} zipfile
*/
openUrl(zipUrl, isBase64){
return request(zipUrl, "binary")
.then(function(data){
return this.zip.loadAsync(data, {"base64": isBase64});
}.bind(this));
}
/**
* Request a url from the archive
* @param {string} url a url to request from the archive
* @param {string} [type] specify the type of the returned result
* @return {Promise<Blob | string | JSON | Document | XMLDocument>}
*/
request(url, type){
var deferred = new defer();
var response;
var path = new Path(url);
// If type isn't set, determine it from the file extension
if(!type) {
type = path.extension;
}
if(type == "blob"){
response = this.getBlob(url);
} else {
response = this.getText(url);
}
if (response) {
response.then(function (r) {
let result = this.handleResponse(r, type);
deferred.resolve(result);
}.bind(this));
} else {
deferred.reject({
message : "File not found in the epub: " + url,
stack : new Error().stack
});
}
return deferred.promise;
}
/**
* Handle the response from request
* @private
* @param {any} response
* @param {string} [type]
* @return {any} the parsed result
*/
handleResponse(response, type){
var r;
if(type == "json") {
r = JSON.parse(response);
}
else
if(isXml(type)) {
r = parse(response, "text/xml");
}
else
if(type == "xhtml") {
r = parse(response, "application/xhtml+xml");
}
else
if(type == "html" || type == "htm") {
r = parse(response, "text/html");
} else {
r = response;
}
return r;
}
/**
* Get a Blob from Archive by Url
* @param {string} url
* @param {string} [mimeType]
* @return {Blob}
*/
getBlob(url, mimeType){
var decodededUrl = window.decodeURIComponent(url.substr(1)); // Remove first slash
var entry = this.zip.file(decodededUrl);
if(entry) {
mimeType = mimeType || mime.lookup(entry.name);
return entry.async("uint8array").then(function(uint8array) {
return new Blob([uint8array], {type : mimeType});
});
}
}
/**
* Get Text from Archive by Url
* @param {string} url
* @param {string} [encoding]
* @return {string}
*/
getText(url, encoding){
var decodededUrl = window.decodeURIComponent(url.substr(1)); // Remove first slash
var entry = this.zip.file(decodededUrl);
if(entry) {
return entry.async("string").then(function(text) {
return text;
});
}
}
/**
* Get a base64 encoded result from Archive by Url
* @param {string} url
* @param {string} [mimeType]
* @return {string} base64 encoded
*/
getBase64(url, mimeType){
var decodededUrl = window.decodeURIComponent(url.substr(1)); // Remove first slash
var entry = this.zip.file(decodededUrl);
if(entry) {
mimeType = mimeType || mime.lookup(entry.name);
return entry.async("base64").then(function(data) {
return "data:" + mimeType + ";base64," + data;
});
}
}
/**
* Create a Url from an unarchived item
* @param {string} url
* @param {object} [options.base64] use base64 encoding or blob url
* @return {Promise} url promise with Url string
*/
createUrl(url, options){
var deferred = new defer();
var _URL = window.URL || window.webkitURL || window.mozURL;
var tempUrl;
var response;
var useBase64 = options && options.base64;
if(url in this.urlCache) {
deferred.resolve(this.urlCache[url]);
return deferred.promise;
}
if (useBase64) {
response = this.getBase64(url);
if (response) {
response.then(function(tempUrl) {
this.urlCache[url] = tempUrl;
deferred.resolve(tempUrl);
}.bind(this));
}
} else {
response = this.getBlob(url);
if (response) {
response.then(function(blob) {
tempUrl = _URL.createObjectURL(blob);
this.urlCache[url] = tempUrl;
deferred.resolve(tempUrl);
}.bind(this));
}
}
if (!response) {
deferred.reject({
message : "File not found in the epub: " + url,
stack : new Error().stack
});
}
return deferred.promise;
}
/**
* Revoke Temp Url for a achive item
* @param {string} url url of the item in the archive
*/
revokeUrl(url){
var _URL = window.URL || window.webkitURL || window.mozURL;
var fromCache = this.urlCache[url];
if(fromCache) _URL.revokeObjectURL(fromCache);
}
destroy() {
var _URL = window.URL || window.webkitURL || window.mozURL;
for (let fromCache in this.urlCache) {
_URL.revokeObjectURL(fromCache);
}
this.zip = undefined;
this.urlCache = {};
}
}
export default Archive;
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