8398c9048d
code was modified slightly, so the code differs from the original downloadable 1.9.5 version
450 lines
13 KiB
JavaScript
450 lines
13 KiB
JavaScript
dojo.provide("dojox.off.files");
|
|
|
|
// Author: Brad Neuberg, bkn3@columbia.edu, http://codinginparadise.org
|
|
|
|
// summary:
|
|
// Helps maintain resources that should be
|
|
// available offline, such as CSS files.
|
|
// description:
|
|
// dojox.off.files makes it easy to indicate
|
|
// what resources should be available offline,
|
|
// such as CSS files, JavaScript, HTML, etc.
|
|
dojox.off.files = {
|
|
// versionURL: String
|
|
// An optional file, that if present, records the version
|
|
// of our bundle of files to make available offline. If this
|
|
// file is present, and we are not currently debugging,
|
|
// then we only refresh our offline files if the version has
|
|
// changed.
|
|
versionURL: "version.js",
|
|
|
|
// listOfURLs: Array
|
|
// For advanced usage; most developers can ignore this.
|
|
// Our list of URLs that will be cached and made available
|
|
// offline.
|
|
listOfURLs: [],
|
|
|
|
// refreshing: boolean
|
|
// For advanced usage; most developers can ignore this.
|
|
// Whether we are currently in the middle
|
|
// of refreshing our list of offline files.
|
|
refreshing: false,
|
|
|
|
_cancelID: null,
|
|
|
|
_error: false,
|
|
_errorMessages: [],
|
|
_currentFileIndex: 0,
|
|
_store: null,
|
|
_doSlurp: false,
|
|
|
|
slurp: function(){
|
|
// summary:
|
|
// Autoscans the page to find all resources to
|
|
// cache. This includes scripts, images, CSS, and hyperlinks
|
|
// to pages that are in the same scheme/port/host as this
|
|
// page. We also scan the embedded CSS of any stylesheets
|
|
// to find @import statements and url()'s.
|
|
// You should call this method from the top-level, outside of
|
|
// any functions and before the page loads:
|
|
//
|
|
// <script>
|
|
// dojo.require("dojox.sql");
|
|
// dojo.require("dojox.off");
|
|
// dojo.require("dojox.off.ui");
|
|
// dojo.require("dojox.off.sync");
|
|
//
|
|
// // configure how we should work offline
|
|
//
|
|
// // set our application name
|
|
// dojox.off.ui.appName = "Moxie";
|
|
//
|
|
// // automatically "slurp" the page and
|
|
// // capture the resources we need offline
|
|
// dojox.off.files.slurp();
|
|
//
|
|
// // tell Dojo Offline we are ready for it to initialize itself now
|
|
// // that we have finished configuring it for our application
|
|
// dojox.off.initialize();
|
|
// </script>
|
|
//
|
|
// Note that inline styles on elements are not handled (i.e.
|
|
// if you somehow have an inline style that uses a URL);
|
|
// object and embed tags are not scanned since their format
|
|
// differs based on type; and elements created by JavaScript
|
|
// after page load are not found. For these you must manually
|
|
// add them with a dojox.off.files.cache() method call.
|
|
|
|
// just schedule the slurp once the page is loaded and
|
|
// Dojo Offline is ready to slurp; dojox.off will call
|
|
// our _slurp() method before indicating it is finished
|
|
// loading
|
|
this._doSlurp = true;
|
|
},
|
|
|
|
cache: function(urlOrList){ /* void */
|
|
// summary:
|
|
// Caches a file or list of files to be available offline. This
|
|
// can either be a full URL, such as http://foobar.com/index.html,
|
|
// or a relative URL, such as ../index.html. This URL is not
|
|
// actually cached until dojox.off.sync.synchronize() is called.
|
|
// urlOrList: String or Array[]
|
|
// A URL of a file to cache or an Array of Strings of files to
|
|
// cache
|
|
|
|
//console.debug("dojox.off.files.cache, urlOrList="+urlOrList);
|
|
|
|
if(dojo.isString(urlOrList)){
|
|
var url = this._trimAnchor(urlOrList+"");
|
|
if(!this.isAvailable(url)){
|
|
this.listOfURLs.push(url);
|
|
}
|
|
}else if(urlOrList instanceof dojo._Url){
|
|
var url = this._trimAnchor(urlOrList.uri);
|
|
if(!this.isAvailable(url)){
|
|
this.listOfURLs.push(url);
|
|
}
|
|
}else{
|
|
dojo.forEach(urlOrList, function(url){
|
|
url = this._trimAnchor(url);
|
|
if(!this.isAvailable(url)){
|
|
this.listOfURLs.push(url);
|
|
}
|
|
}, this);
|
|
}
|
|
},
|
|
|
|
printURLs: function(){
|
|
// summary:
|
|
// A helper function that will dump and print out
|
|
// all of the URLs that are cached for offline
|
|
// availability. This can help with debugging if you
|
|
// are trying to make sure that all of your URLs are
|
|
// available offline
|
|
console.debug("The following URLs are cached for offline use:");
|
|
dojo.forEach(this.listOfURLs, function(i){
|
|
console.debug(i);
|
|
});
|
|
},
|
|
|
|
remove: function(url){ /* void */
|
|
// summary:
|
|
// Removes a URL from the list of files to cache.
|
|
// description:
|
|
// Removes a URL from the list of URLs to cache. Note that this
|
|
// does not actually remove the file from the offline cache;
|
|
// instead, it just prevents us from refreshing this file at a
|
|
// later time, so that it will naturally time out and be removed
|
|
// from the offline cache
|
|
// url: String
|
|
// The URL to remove
|
|
for(var i = 0; i < this.listOfURLs.length; i++){
|
|
if(this.listOfURLs[i] == url){
|
|
this.listOfURLs = this.listOfURLs.splice(i, 1);
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
|
|
isAvailable: function(url){ /* boolean */
|
|
// summary:
|
|
// Determines whether the given resource is available offline.
|
|
// url: String
|
|
// The URL to check
|
|
for(var i = 0; i < this.listOfURLs.length; i++){
|
|
if(this.listOfURLs[i] == url){
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
},
|
|
|
|
refresh: function(callback){ /* void */
|
|
//console.debug("dojox.off.files.refresh");
|
|
// summary:
|
|
// For advanced usage; most developers can ignore this.
|
|
// Refreshes our list of offline resources,
|
|
// making them available offline.
|
|
// callback: Function
|
|
// A callback that receives two arguments: whether an error
|
|
// occurred, which is a boolean; and an array of error message strings
|
|
// with details on errors encountered. If no error occured then message is
|
|
// empty array with length 0.
|
|
try{
|
|
if(dojo.config.isDebug){
|
|
this.printURLs();
|
|
}
|
|
|
|
this.refreshing = true;
|
|
|
|
if(this.versionURL){
|
|
this._getVersionInfo(function(oldVersion, newVersion, justDebugged){
|
|
//console.warn("getVersionInfo, oldVersion="+oldVersion+", newVersion="+newVersion
|
|
// + ", justDebugged="+justDebugged+", isDebug="+dojo.config.isDebug);
|
|
if(dojo.config.isDebug || !newVersion || justDebugged
|
|
|| !oldVersion || oldVersion != newVersion){
|
|
console.warn("Refreshing offline file list");
|
|
this._doRefresh(callback, newVersion);
|
|
}else{
|
|
console.warn("No need to refresh offline file list");
|
|
callback(false, []);
|
|
}
|
|
});
|
|
}else{
|
|
console.warn("Refreshing offline file list");
|
|
this._doRefresh(callback);
|
|
}
|
|
}catch(e){
|
|
this.refreshing = false;
|
|
|
|
// can't refresh files -- core operation --
|
|
// fail fast
|
|
dojox.off.coreOpFailed = true;
|
|
dojox.off.enabled = false;
|
|
dojox.off.onFrameworkEvent("coreOperationFailed");
|
|
}
|
|
},
|
|
|
|
abortRefresh: function(){
|
|
// summary:
|
|
// For advanced usage; most developers can ignore this.
|
|
// Aborts and cancels a refresh.
|
|
if(!this.refreshing){
|
|
return;
|
|
}
|
|
|
|
this._store.abortCapture(this._cancelID);
|
|
this.refreshing = false;
|
|
},
|
|
|
|
_slurp: function(){
|
|
if(!this._doSlurp){
|
|
return;
|
|
}
|
|
|
|
var handleUrl = dojo.hitch(this, function(url){
|
|
if(this._sameLocation(url)){
|
|
this.cache(url);
|
|
}
|
|
});
|
|
|
|
handleUrl(window.location.href);
|
|
|
|
dojo.query("script").forEach(function(i){
|
|
try{
|
|
handleUrl(i.getAttribute("src"));
|
|
}catch(exp){
|
|
//console.debug("dojox.off.files.slurp 'script' error: "
|
|
// + exp.message||exp);
|
|
}
|
|
});
|
|
|
|
dojo.query("link").forEach(function(i){
|
|
try{
|
|
if(!i.getAttribute("rel")
|
|
|| i.getAttribute("rel").toLowerCase() != "stylesheet"){
|
|
return;
|
|
}
|
|
|
|
handleUrl(i.getAttribute("href"));
|
|
}catch(exp){
|
|
//console.debug("dojox.off.files.slurp 'link' error: "
|
|
// + exp.message||exp);
|
|
}
|
|
});
|
|
|
|
dojo.query("img").forEach(function(i){
|
|
try{
|
|
handleUrl(i.getAttribute("src"));
|
|
}catch(exp){
|
|
//console.debug("dojox.off.files.slurp 'img' error: "
|
|
// + exp.message||exp);
|
|
}
|
|
});
|
|
|
|
dojo.query("a").forEach(function(i){
|
|
try{
|
|
handleUrl(i.getAttribute("href"));
|
|
}catch(exp){
|
|
//console.debug("dojox.off.files.slurp 'a' error: "
|
|
// + exp.message||exp);
|
|
}
|
|
});
|
|
|
|
// FIXME: handle 'object' and 'embed' tag
|
|
|
|
// parse our style sheets for inline URLs and imports
|
|
dojo.forEach(document.styleSheets, function(sheet){
|
|
try{
|
|
if(sheet.cssRules){ // Firefox
|
|
dojo.forEach(sheet.cssRules, function(rule){
|
|
var text = rule.cssText;
|
|
if(text){
|
|
var matches = text.match(/url\(\s*([^\) ]*)\s*\)/i);
|
|
if(!matches){
|
|
return;
|
|
}
|
|
|
|
for(var i = 1; i < matches.length; i++){
|
|
handleUrl(matches[i])
|
|
}
|
|
}
|
|
});
|
|
}else if(sheet.cssText){ // IE
|
|
var matches;
|
|
var text = sheet.cssText.toString();
|
|
// unfortunately, using RegExp.exec seems to be flakey
|
|
// for looping across multiple lines on IE using the
|
|
// global flag, so we have to simulate it
|
|
var lines = text.split(/\f|\r|\n/);
|
|
for(var i = 0; i < lines.length; i++){
|
|
matches = lines[i].match(/url\(\s*([^\) ]*)\s*\)/i);
|
|
if(matches && matches.length){
|
|
handleUrl(matches[1]);
|
|
}
|
|
}
|
|
}
|
|
}catch(exp){
|
|
//console.debug("dojox.off.files.slurp stylesheet parse error: "
|
|
// + exp.message||exp);
|
|
}
|
|
});
|
|
|
|
//this.printURLs();
|
|
},
|
|
|
|
_sameLocation: function(url){
|
|
if(!url){ return false; }
|
|
|
|
// filter out anchors
|
|
if(url.length && url.charAt(0) == "#"){
|
|
return false;
|
|
}
|
|
|
|
// FIXME: dojo._Url should be made public;
|
|
// it's functionality is very useful for
|
|
// parsing URLs correctly, which is hard to
|
|
// do right
|
|
url = new dojo._Url(url);
|
|
|
|
// totally relative -- ../../someFile.html
|
|
if(!url.scheme && !url.port && !url.host){
|
|
return true;
|
|
}
|
|
|
|
// scheme relative with port specified -- brad.com:8080
|
|
if(!url.scheme && url.host && url.port
|
|
&& window.location.hostname == url.host
|
|
&& window.location.port == url.port){
|
|
return true;
|
|
}
|
|
|
|
// scheme relative with no-port specified -- brad.com
|
|
if(!url.scheme && url.host && !url.port
|
|
&& window.location.hostname == url.host
|
|
&& window.location.port == 80){
|
|
return true;
|
|
}
|
|
|
|
// else we have everything
|
|
return window.location.protocol == (url.scheme + ":")
|
|
&& window.location.hostname == url.host
|
|
&& (window.location.port == url.port || !window.location.port && !url.port);
|
|
},
|
|
|
|
_trimAnchor: function(url){
|
|
return url.replace(/\#.*$/, "");
|
|
},
|
|
|
|
_doRefresh: function(callback, newVersion){
|
|
// get our local server
|
|
var localServer;
|
|
try{
|
|
localServer = google.gears.factory.create("beta.localserver", "1.0");
|
|
}catch(exp){
|
|
dojo.setObject("google.gears.denied", true);
|
|
dojox.off.onFrameworkEvent("coreOperationFailed");
|
|
throw "Google Gears must be allowed to run";
|
|
}
|
|
|
|
var storeName = "dot_store_"
|
|
+ window.location.href.replace(/[^0-9A-Za-z_]/g, "_");
|
|
|
|
// clip at 64 characters, the max length of a resource store name
|
|
if(storeName.length >= 64){
|
|
storeName = storeName.substring(0, 63);
|
|
}
|
|
|
|
// refresh everything by simply removing
|
|
// any older stores
|
|
localServer.removeStore(storeName);
|
|
|
|
// open/create the resource store
|
|
localServer.openStore(storeName);
|
|
var store = localServer.createStore(storeName);
|
|
this._store = store;
|
|
|
|
// add our list of files to capture
|
|
var self = this;
|
|
this._currentFileIndex = 0;
|
|
this._cancelID = store.capture(this.listOfURLs, function(url, success, captureId){
|
|
//console.debug("store.capture, url="+url+", success="+success);
|
|
if(!success && self.refreshing){
|
|
self._cancelID = null;
|
|
self.refreshing = false;
|
|
var errorMsgs = [];
|
|
errorMsgs.push("Unable to capture: " + url);
|
|
callback(true, errorMsgs);
|
|
return;
|
|
}else if(success){
|
|
self._currentFileIndex++;
|
|
}
|
|
|
|
if(success && self._currentFileIndex >= self.listOfURLs.length){
|
|
self._cancelID = null;
|
|
self.refreshing = false;
|
|
if(newVersion){
|
|
dojox.storage.put("oldVersion", newVersion, null,
|
|
dojox.off.STORAGE_NAMESPACE);
|
|
}
|
|
dojox.storage.put("justDebugged", dojo.config.isDebug, null,
|
|
dojox.off.STORAGE_NAMESPACE);
|
|
callback(false, []);
|
|
}
|
|
});
|
|
},
|
|
|
|
_getVersionInfo: function(callback){
|
|
var justDebugged = dojox.storage.get("justDebugged",
|
|
dojox.off.STORAGE_NAMESPACE);
|
|
var oldVersion = dojox.storage.get("oldVersion",
|
|
dojox.off.STORAGE_NAMESPACE);
|
|
var newVersion = null;
|
|
|
|
callback = dojo.hitch(this, callback);
|
|
|
|
dojo.xhrGet({
|
|
url: this.versionURL + "?browserbust=" + new Date().getTime(),
|
|
timeout: 5 * 1000,
|
|
handleAs: "javascript",
|
|
error: function(err){
|
|
//console.warn("dojox.off.files._getVersionInfo, err=",err);
|
|
dojox.storage.remove("oldVersion", dojox.off.STORAGE_NAMESPACE);
|
|
dojox.storage.remove("justDebugged", dojox.off.STORAGE_NAMESPACE);
|
|
callback(oldVersion, newVersion, justDebugged);
|
|
},
|
|
load: function(data){
|
|
//console.warn("dojox.off.files._getVersionInfo, load=",data);
|
|
|
|
// some servers incorrectly return 404's
|
|
// as a real page
|
|
if(data){
|
|
newVersion = data;
|
|
}
|
|
|
|
callback(oldVersion, newVersion, justDebugged);
|
|
}
|
|
});
|
|
}
|
|
}
|