Software: Apache. PHP/5.5.15 uname -a: Windows NT SVR-DMZ 6.1 build 7600 (Windows Server 2008 R2 Enterprise Edition) i586 SYSTEM Safe-mode: OFF (not secure) C:\Extranet\C\Archivos de programa\Mozilla Firefox\components\ drwxrwxrwx | |
| Viewing file: Select action/file-type: //@line 40 "e:\fx19rel\WINNT_5.2_Depend\mozilla\browser\components\microsummaries\src\nsMicrosummaryService.js"
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
const PERMS_FILE = 0644;
const MODE_WRONLY = 0x02;
const MODE_CREATE = 0x08;
const MODE_TRUNCATE = 0x20;
const NS_ERROR_MODULE_DOM = 2152923136;
const NS_ERROR_DOM_BAD_URI = NS_ERROR_MODULE_DOM + 1012;
// How often to check for microsummaries that need updating, in milliseconds.
const CHECK_INTERVAL = 15 * 1000; // 15 seconds
// How often to check for generator updates, in seconds
const GENERATOR_INTERVAL = 7 * 86400; // 1 week
const MICSUM_NS = "http://www.mozilla.org/microsummaries/0.1";
const XSLT_NS = "http://www.w3.org/1999/XSL/Transform";
const ANNO_MICSUM_GEN_URI = "microsummary/generatorURI";
const ANNO_MICSUM_EXPIRATION = "microsummary/expiration";
const ANNO_STATIC_TITLE = "bookmarks/staticTitle";
const ANNO_CONTENT_TYPE = "bookmarks/contentType";
const MAX_SUMMARY_LENGTH = 4096;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
function MicrosummaryService() {
this._obs.addObserver(this, "xpcom-shutdown", true);
Cc["@mozilla.org/preferences-service;1"].
getService(Ci.nsIPrefService).
getBranch("browser.microsummary.").
QueryInterface(Ci.nsIPrefBranch2).
addObserver("", this, true);
this._initTimers();
this._cacheLocalGenerators();
}
MicrosummaryService.prototype = {
// Bookmarks Service
__bms: null,
get _bms() {
if (!this.__bms)
this.__bms = Cc["@mozilla.org/browser/nav-bookmarks-service;1"].
getService(Ci.nsINavBookmarksService);
return this.__bms;
},
// Annotation Service
__ans: null,
get _ans() {
if (!this.__ans)
this.__ans = Cc["@mozilla.org/browser/annotation-service;1"].
getService(Ci.nsIAnnotationService);
return this.__ans;
},
// IO Service
__ios: null,
get _ios() {
if (!this.__ios)
this.__ios = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
return this.__ios;
},
// Observer Service
__obs: null,
get _obs() {
if (!this.__obs)
this.__obs = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
return this.__obs;
},
/**
* Make a URI from a spec.
* @param spec
* The string spec of the URI.
* @returns An nsIURI object.
*/
_uri: function MSS__uri(spec) {
return this._ios.newURI(spec, null, null);
},
// Directory Locator
__dirs: null,
get _dirs() {
if (!this.__dirs)
this.__dirs = Cc["@mozilla.org/file/directory_service;1"].
getService(Ci.nsIProperties);
return this.__dirs;
},
// The update interval as specified by the user (defaults to 30 minutes)
get _updateInterval() {
var updateInterval =
getPref("browser.microsummary.updateInterval", 30);
// the minimum update interval is 1 minute
return Math.max(updateInterval, 1) * 60 * 1000;
},
// A cache of local microsummary generators. This gets built on startup
// by the _cacheLocalGenerators() method.
_localGenerators: {},
// The timer that periodically checks for microsummaries needing updating.
_timer: null,
// XPCOM registration
classDescription: "Microsummary Service",
contractID: "@mozilla.org/microsummary/service;1",
classID: Components.ID("{460a9792-b154-4f26-a922-0f653e2c8f91}"),
QueryInterface: XPCOMUtils.generateQI([Ci.nsIMicrosummaryService,
Ci.nsISupportsWeakReference,
Ci.nsIObserver]),
// nsIObserver
observe: function MSS_observe(subject, topic, data) {
switch (topic) {
case "xpcom-shutdown":
this._destroy();
break;
case "nsPref:changed":
if (data == "enabled")
this._initTimers();
break;
}
},
_initTimers: function MSS__initTimers() {
if (this._timer)
this._timer.cancel();
if (!getPref("browser.microsummary.enabled", true))
return;
// Periodically update microsummaries that need updating.
this._timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
var callback = {
_svc: this,
notify: function(timer) { this._svc._updateMicrosummaries() }
};
this._timer.initWithCallback(callback,
CHECK_INTERVAL,
this._timer.TYPE_REPEATING_SLACK);
// Setup a cross-session timer to periodically check for generator updates.
var updateManager = Cc["@mozilla.org/updates/timer-manager;1"].
getService(Ci.nsIUpdateTimerManager);
var interval = getPref("browser.microsummary.generatorUpdateInterval",
GENERATOR_INTERVAL);
var updateCallback = {
_svc: this,
notify: function(timer) { this._svc._updateGenerators() }
};
updateManager.registerTimer("microsummary-generator-update-timer",
updateCallback, interval);
},
_destroy: function MSS__destroy() {
this._timer.cancel();
this._timer = null;
},
_updateMicrosummaries: function MSS__updateMicrosummaries() {
var bookmarks = this._getBookmarks();
var now = Date.now();
var updateInterval = this._updateInterval;
for ( var i = 0; i < bookmarks.length; i++ ) {
var bookmarkID = bookmarks[i];
// Skip this page if its microsummary hasn't expired yet.
if (this._ans.itemHasAnnotation(bookmarkID, ANNO_MICSUM_EXPIRATION) &&
this._ans.getItemAnnotation(bookmarkID, ANNO_MICSUM_EXPIRATION) > now)
continue;
// Reset the expiration time immediately, so if the refresh is failing
// we don't try it every 15 seconds, potentially overloading the server.
this._setAnnotation(bookmarkID, ANNO_MICSUM_EXPIRATION, now + updateInterval);
// Try to update the microsummary, but trap errors, so an update
// that throws doesn't prevent us from updating the rest of them.
try {
this.refreshMicrosummary(bookmarkID);
}
catch(ex) {
Cu.reportError(ex);
}
}
},
_updateGenerators: function MSS__updateGenerators() {
var generators = this._localGenerators;
var update = getPref("browser.microsummary.updateGenerators", true);
if (!generators || !update)
return;
for (let uri in generators)
generators[uri].update();
},
_updateMicrosummary: function MSS__updateMicrosummary(bookmarkID, microsummary) {
var title = this._bms.getItemTitle(bookmarkID);
// Ensure the user-given title is cached
if (!this._ans.itemHasAnnotation(bookmarkID, ANNO_STATIC_TITLE))
this._setAnnotation(bookmarkID, ANNO_STATIC_TITLE, title);
// A string identifying the bookmark to use when logging the update.
var bookmarkIdentity = bookmarkID;
// Update if the microsummary differs from the current title.
if (!title || title != microsummary.content) {
this._bms.setItemTitle(bookmarkID, microsummary.content);
var subject = new LiveTitleNotificationSubject(bookmarkID, microsummary);
LOG("updated live title for " + bookmarkIdentity +
" from '" + (title == null ? "<no live title>" : title) +
"' to '" + microsummary.content + "'");
this._obs.notifyObservers(subject, "microsummary-livetitle-updated", title);
}
else {
LOG("didn't update live title for " + bookmarkIdentity + "; it hasn't changed");
}
// Whether or not the title itself has changed, we still save any changes
// to the update interval, since the interval represents how long to wait
// before checking again for updates, and that can vary across updates,
// even when the title itself hasn't changed.
this._setAnnotation(bookmarkID, ANNO_MICSUM_EXPIRATION,
Date.now() + (microsummary.updateInterval || this._updateInterval));
},
/**
* Load local generators into the cache.
*
*/
_cacheLocalGenerators: function MSS__cacheLocalGenerators() {
// Load generators from the application directory.
var appDir = this._dirs.get("MicsumGens", Ci.nsIFile);
if (appDir.exists())
this._cacheLocalGeneratorDir(appDir);
// Load generators from the user's profile.
var profileDir = this._dirs.get("UsrMicsumGens", Ci.nsIFile);
if (profileDir.exists())
this._cacheLocalGeneratorDir(profileDir);
},
/**
* Load local generators from a directory into the cache.
*
* @param dir
* nsIFile object pointing to directory containing generator files
*
*/
_cacheLocalGeneratorDir: function MSS__cacheLocalGeneratorDir(dir) {
var files = dir.directoryEntries.QueryInterface(Ci.nsIDirectoryEnumerator);
var file = files.nextFile;
while (file) {
// Recursively load generators so support packs containing
// lots of generators can organize them into multiple directories.
if (file.isDirectory())
this._cacheLocalGeneratorDir(file);
else
this._cacheLocalGeneratorFile(file);
file = files.nextFile;
}
files.close();
},
/**
* Load a local generator from a file into the cache.
*
* @param file
* nsIFile object pointing to file from which to load generator
*
*/
_cacheLocalGeneratorFile: function MSS__cacheLocalGeneratorFile(file) {
var uri = this._ios.newFileURI(file);
var t = this;
var callback =
function MSS_cacheLocalGeneratorCallback(resource) {
try { t._handleLocalGenerator(resource) }
finally { resource.destroy() }
};
var resource = new MicrosummaryResource(uri);
resource.load(callback);
},
_handleLocalGenerator: function MSS__handleLocalGenerator(resource) {
if (!resource.isXML)
throw(resource.uri.spec + " microsummary generator loaded, but not XML");
var generator = new MicrosummaryGenerator(null, resource.uri);
generator.initFromXML(resource.content);
// Add the generator to the local generators cache.
// XXX Figure out why Firefox crashes on shutdown if we index generators
// by uri.spec but doesn't crash if we index by uri.spec.split().join().
//this._localGenerators[generator.uri.spec] = generator;
this._localGenerators[generator.uri.spec.split().join()] = generator;
LOG("loaded local microsummary generator\n" +
" file: " + generator.localURI.spec + "\n" +
" ID: " + generator.uri.spec);
},
// nsIMicrosummaryService
/**
* Return a microsummary generator for the given URI.
*
* @param generatorURI
* the URI of the generator
*/
getGenerator: function MSS_getGenerator(generatorURI) {
return this._localGenerators[generatorURI.spec] ||
new MicrosummaryGenerator(generatorURI);
},
/**
* Install the microsummary generator from the resource at the supplied URI.
* Callable by content via the addMicrosummaryGenerator() sidebar method.
*
* @param generatorURI
* the URI of the resource providing the generator
*
*/
addGenerator: function MSS_addGenerator(generatorURI) {
var t = this;
var callback =
function MSS_addGeneratorCallback(resource) {
try { t._handleNewGenerator(resource) }
finally { resource.destroy() }
};
var resource = new MicrosummaryResource(generatorURI);
resource.load(callback);
},
_handleNewGenerator: function MSS__handleNewGenerator(resource) {
if (!resource.isXML)
throw(resource.uri.spec + " microsummary generator loaded, but not XML");
// XXX Make sure it's a valid microsummary generator.
var rootNode = resource.content.documentElement;
// Add a reference to the URI from which we got this generator so we have
// a unique identifier for the generator and also so we can check back later
// for updates.
rootNode.setAttribute("uri", "urn:source:" + resource.uri.spec);
this.installGenerator(resource.content);
},
/**
* Install a microsummary generator from the given XML definition.
*
* @param xmlDefinition
* an nsIDOMDocument XML document defining the generator
*
* @returns the newly-installed nsIMicrosummaryGenerator generator
*
*/
installGenerator: function MSS_installGenerator(xmlDefinition) {
var rootNode = xmlDefinition.getElementsByTagNameNS(MICSUM_NS, "generator")[0];
var generatorID = rootNode.getAttribute("uri");
// The existing cache entry for this generator, if it is already installed.
var generator = this._localGenerators[generatorID];
var topic;
if (generator)
topic = "microsummary-generator-updated";
else {
// This generator is not already installed. Save it as a new file.
topic = "microsummary-generator-installed";
var generatorName = rootNode.getAttribute("name");
var fileName = sanitizeName(generatorName) + ".xml";
var file = this._dirs.get("UsrMicsumGens", Ci.nsIFile);
file.append(fileName);
file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, PERMS_FILE);
generator = new MicrosummaryGenerator(null, this._ios.newFileURI(file));
this._localGenerators[generatorID] = generator;
}
// Initialize (or reinitialize) the generator from its XML definition,
// the save the definition to the generator's file.
generator.initFromXML(xmlDefinition);
generator.saveXMLToFile(xmlDefinition);
LOG("installed generator " + generatorID);
this._obs.notifyObservers(generator, topic, null);
return generator;
},
/**
* Get the set of microsummaries available for a given page. The set
* might change after this method returns, since this method will trigger
* an asynchronous load of the page in question (if it isn't already loaded)
* to see if it references any page-specific microsummaries.
*
* If the caller passes a bookmark ID, and one of the microsummaries
* is the current one for the bookmark, this method will retrieve content
* from the datastore for that microsummary, which is useful when callers
* want to display a list of microsummaries for a page that isn't loaded,
* and they want to display the actual content of the selected microsummary
* immediately (rather than after the content is asynchronously loaded).
*
* @param pageURI
* the URI of the page for which to retrieve available microsummaries
*
* @param bookmarkID (optional)
* the ID of the bookmark for which this method is being called
*
* @returns an nsIMicrosummarySet of nsIMicrosummaries for the given page
*
*/
getMicrosummaries: function MSS_getMicrosummaries(pageURI, bookmarkID) {
var microsummaries = new MicrosummarySet();
if (!getPref("browser.microsummary.enabled", true))
return microsummaries;
// Get microsummaries defined by local generators.
for (var genURISpec in this._localGenerators) {
var generator = this._localGenerators[genURISpec];
if (generator.appliesToURI(pageURI)) {
var microsummary = new Microsummary(pageURI, generator);
// If this is the current microsummary for this bookmark, load the content
// from the datastore so it shows up immediately in microsummary picking UI.
if (bookmarkID != -1 && this.isMicrosummary(bookmarkID, microsummary))
microsummary._content = this._bms.getItemTitle(bookmarkID);
microsummaries.AppendElement(microsummary);
}
}
// If a bookmark identifier has been provided, list its microsummary
// synchronously, if any.
if (bookmarkID != -1 && this.hasMicrosummary(bookmarkID)) {
var currentMicrosummary = this.getMicrosummary(bookmarkID);
if (!microsummaries.hasItemForMicrosummary(currentMicrosummary))
microsummaries.AppendElement(currentMicrosummary);
}
// Get microsummaries defined by the page. If we don't have the page,
// download it asynchronously, and then finish populating the set.
var resource = getLoadedMicrosummaryResource(pageURI);
if (resource) {
try { microsummaries.extractFromPage(resource) }
finally { resource.destroy() }
}
else {
// Load the page with a callback that will add the page's microsummaries
// to the set once the page has loaded.
var callback = function MSS_extractFromPageCallback(resource) {
try { microsummaries.extractFromPage(resource) }
finally { resource.destroy() }
};
try {
resource = new MicrosummaryResource(pageURI);
resource.load(callback);
}
catch(e) {
// We don't have to do anything special if the call fails besides
// destroying the Resource object. We can just return the list
// of microsummaries without including page-defined microsummaries.
if (resource)
resource.destroy();
LOG("error downloading page to extract its microsummaries: " + e);
}
}
return microsummaries;
},
/**
* Change all occurrences of a specific value in a given field to a new value.
*
* @param fieldName
* the name of the field whose values should be changed
* @param oldValue
* the value that should be changed
* @param newValue
* the value to which it should be changed
*
*/
_changeField: function MSS__changeField(fieldName, oldValue, newValue) {
var bookmarks = this._getBookmarks();
for ( var i = 0; i < bookmarks.length; i++ ) {
var bookmarkID = bookmarks[i];
if (this._ans.itemHasAnnotation(bookmarkID, fieldName) &&
this._ans.getItemAnnotation(bookmarkID, fieldName) == oldValue)
this._setAnnotation(bookmarkID, fieldName, newValue);
}
},
/**
* Get the set of bookmarks with microsummaries.
*
* This is the internal version of this method, which is not accessible
* via XPCOM but is more performant; inside this component, use this version.
* Outside the component, use getBookmarks (no underscore prefix) instead.
*
* @returns an array of place: uris representing bookmarks items
*
*/
_getBookmarks: function MSS__getBookmarks() {
var bookmarks;
// This try/catch block is a temporary workaround for bug 336194.
try {
bookmarks = this._ans.getItemsWithAnnotation(ANNO_MICSUM_GEN_URI, {});
}
catch(e) {
bookmarks = [];
}
return bookmarks;
},
_setAnnotation: function MSS__setAnnotation(aBookmarkId, aFieldName, aFieldValue) {
this._ans.setItemAnnotation(aBookmarkId,
aFieldName,
aFieldValue,
0,
this._ans.EXPIRE_NEVER);
},
/**
* Get the set of bookmarks with microsummaries.
*
* This is the external version of this method and is accessible via XPCOM.
* Use it outside this component. Inside the component, use _getBookmarks
* (with underscore prefix) instead for performance.
*
* @returns an nsISimpleEnumerator enumeration of bookmark IDs
*
*/
getBookmarks: function MSS_getBookmarks() {
return new ArrayEnumerator(this._getBookmarks());
},
/**
* Get the current microsummary for the given bookmark.
*
* @param bookmarkID
* the bookmark for which to get the current microsummary
*
* @returns the current microsummary for the bookmark, or null
* if the bookmark does not have a current microsummary
*
*/
getMicrosummary: function MSS_getMicrosummary(bookmarkID) {
if (!this.hasMicrosummary(bookmarkID))
return null;
var pageURI = this._bms.getBookmarkURI(bookmarkID);
var generatorURI = this._uri(this._ans.getItemAnnotation(bookmarkID,
ANNO_MICSUM_GEN_URI));
var generator = this.getGenerator(generatorURI);
return new Microsummary(pageURI, generator);
},
/**
* Get a microsummary for a given page URI and generator URI.
*
* @param pageURI
* the URI of the page to be summarized
*
* @param generatorURI
* the URI of the microsummary generator
*
* @returns an nsIMicrosummary for the given page and generator URIs.
*
*/
createMicrosummary: function MSS_createMicrosummary(pageURI, generatorURI) {
var generator = this.getGenerator(generatorURI);
return new Microsummary(pageURI, generator);
},
/**
* Set the current microsummary for the given bookmark.
*
* @param bookmarkID
* the bookmark for which to set the current microsummary
*
* @param microsummary
* the microsummary to set as the current one
*
*/
setMicrosummary: function MSS_setMicrosummary(bookmarkID, microsummary) {
this._setAnnotation(bookmarkID, ANNO_MICSUM_GEN_URI, microsummary.generator.uri.spec);
if (microsummary.content)
this._updateMicrosummary(bookmarkID, microsummary);
else
this.refreshMicrosummary(bookmarkID);
},
/**
* Remove the current microsummary for the given bookmark.
*
* @param bookmarkID
* the bookmark for which to remove the current microsummary
*
*/
removeMicrosummary: function MSS_removeMicrosummary(bookmarkID) {
// Restore the user's title
if (this._ans.itemHasAnnotation(bookmarkID, ANNO_STATIC_TITLE))
this._bms.setItemTitle(bookmarkID, this._ans.getItemAnnotation(bookmarkID, ANNO_STATIC_TITLE));
var fields = [ANNO_MICSUM_GEN_URI,
ANNO_MICSUM_EXPIRATION,
ANNO_STATIC_TITLE,
ANNO_CONTENT_TYPE];
for (let i = 0; i < fields.length; i++) {
var field = fields[i];
if (this._ans.itemHasAnnotation(bookmarkID, field))
this._ans.removeItemAnnotation(bookmarkID, field);
}
},
/**
* Whether or not the given bookmark has a current microsummary.
*
* @param bookmarkID
* the bookmark for which to set the current microsummary
*
* @returns a boolean representing whether or not the given bookmark
* has a current microsummary
*
*/
hasMicrosummary: function MSS_hasMicrosummary(bookmarkID) {
return this._ans.itemHasAnnotation(bookmarkID, ANNO_MICSUM_GEN_URI);
},
/**
* Whether or not the given microsummary is the current microsummary
* for the given bookmark.
*
* @param bookmarkID
* the bookmark to check
*
* @param microsummary
* the microsummary to check
*
* @returns whether or not the microsummary is the current one
* for the bookmark
*
*/
isMicrosummary: function MSS_isMicrosummary(aBookmarkID, aMicrosummary) {
if (!aMicrosummary || !aBookmarkID)
throw Cr.NS_ERROR_INVALID_ARG;
if (this.hasMicrosummary(aBookmarkID)) {
currentMicrosummarry = this.getMicrosummary(aBookmarkID);
if (aMicrosummary.equals(currentMicrosummarry))
return true;
}
return false
},
/**
* Refresh a microsummary, updating its value in the datastore and UI.
* If this method can refresh the microsummary instantly, it will.
* Otherwise, it'll asynchronously download the necessary information
* (the generator and/or page) before refreshing the microsummary.
*
* Callers should check the "content" property of the returned microsummary
* object to distinguish between sync and async refreshes. If its value
* is "null", then it's an async refresh, and the caller should register
* itself as an nsIMicrosummaryObserver via nsIMicrosummary.addObserver()
* to find out when the refresh completes.
*
* @param bookmarkID
* the bookmark whose microsummary is being refreshed
*
* @returns the microsummary being refreshed
*
*/
refreshMicrosummary: function MSS_refreshMicrosummary(bookmarkID) {
if (!this.hasMicrosummary(bookmarkID))
throw "bookmark " + bookmarkID + " does not have a microsummary";
var pageURI = this._bms.getBookmarkURI(bookmarkID);
if (!pageURI)
throw("can't get URL for bookmark with ID " + bookmarkID);
var generatorURI = this._uri(this._ans.getItemAnnotation(bookmarkID,
ANNO_MICSUM_GEN_URI));
var generator = this._localGenerators[generatorURI.spec] ||
new MicrosummaryGenerator(generatorURI);
var microsummary = new Microsummary(pageURI, generator);
// A microsummary observer that calls the microsummary service
// to update the datastore when the microsummary finishes loading.
var observer = {
_svc: this,
_bookmarkID: bookmarkID,
onContentLoaded: function MSS_observer_onContentLoaded(microsummary) {
try {
this._svc._updateMicrosummary(this._bookmarkID, microsummary);
}
finally {
this._svc = null;
this._bookmarkID = null;
microsummary.removeObserver(this);
}
},
onError: function MSS_observer_onError(microsummary) {
if (microsummary.needsRemoval)
this._svc.removeMicrosummary(this._bookmarkID);
}
};
// Register the observer with the microsummary and trigger the microsummary
// to update itself.
microsummary.addObserver(observer);
microsummary.update();
return microsummary;
}
};
function LiveTitleNotificationSubject(bookmarkID, microsummary) {
this.bookmarkID = bookmarkID;
this.microsummary = microsummary;
}
LiveTitleNotificationSubject.prototype = {
bookmarkID: null,
microsummary: null,
// nsISupports
QueryInterface: XPCOMUtils.generateQI([Ci.nsILiveTitleNotificationSubject]),
};
function Microsummary(aPageURI, aGenerator) {
this._observers = [];
this._pageURI = aPageURI || null;
this._generator = aGenerator || null;
this._content = null;
this._pageContent = null;
this._updateInterval = null;
this._needsRemoval = false;
}
Microsummary.prototype = {
// The microsummary service.
__mss: null,
get _mss() {
if (!this.__mss)
this.__mss = Cc["@mozilla.org/microsummary/service;1"].
getService(Ci.nsIMicrosummaryService);
return this.__mss;
},
// IO Service
__ios: null,
get _ios() {
if (!this.__ios)
this.__ios = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
return this.__ios;
},
/**
* Make a URI from a spec.
* @param spec
* The string spec of the URI.
* @returns An nsIURI object.
*/
_uri: function MSS__uri(spec) {
return this._ios.newURI(spec, null, null);
},
// nsISupports
QueryInterface: XPCOMUtils.generateQI([Ci.nsIMicrosummary]),
// nsIMicrosummary
get content() {
// If we have everything we need to generate the content, generate it.
if (!this._content &&
this.generator.loaded &&
(this.pageContent || !this.generator.needsPageContent)) {
this._content = this.generator.generateMicrosummary(this.pageContent);
this._updateInterval = this.generator.calculateUpdateInterval(this.pageContent);
}
// Note: we return "null" if the content wasn't already generated and we
// couldn't retrieve it from the generated title annotation or generate it
// ourselves. So callers shouldn't count on getting content; instead,
// they should call update if the return value of this getter is "null",
// setting an observer to tell them when content generation is done.
return this._content;
},
get generator() { return this._generator },
set generator(newValue) { return this._generator = newValue },
get pageURI() { return this._pageURI },
equals: function(aOther) {
if (this._generator &&
this._pageURI.equals(aOther.pageURI) &&
this._generator.equals(aOther.generator))
return true;
return false;
},
get pageContent() {
if (!this._pageContent) {
// If the page is currently loaded into a browser window, use that.
var resource = getLoadedMicrosummaryResource(this.pageURI);
if (resource) {
this._pageContent = resource.content;
resource.destroy();
}
}
return this._pageContent;
},
set pageContent(newValue) { return this._pageContent = newValue },
get updateInterval() { return this._updateInterval; },
set updateInterval(newValue) { return this._updateInterval = newValue; },
get needsRemoval() { return this._needsRemoval; },
// nsIMicrosummary
addObserver: function MS_addObserver(observer) {
// Register the observer, but only if it isn't already registered,
// so that we don't call the same observer twice for any given change.
if (this._observers.indexOf(observer) == -1)
this._observers.push(observer);
},
removeObserver: function MS_removeObserver(observer) {
//NS_ASSERT(this._observers.indexOf(observer) != -1,
// "can't remove microsummary observer " + observer + ": not registered");
//this._observers =
// this._observers.filter(function(i) { observer != i });
if (this._observers.indexOf(observer) != -1)
this._observers.splice(this._observers.indexOf(observer), 1);
},
/**
* Regenerates the microsummary, asynchronously downloading its generator
* and content as needed.
*
*/
update: function MS_update() {
LOG("microsummary.update called for page:\n " + this.pageURI.spec +
"\nwith generator:\n " + this.generator.uri.spec);
var t = this;
// We use a common error callback here to flag this microsummary for removal
// if either the generator or page content have gone permanently missing.
var errorCallback = function MS_errorCallback(resource) {
if (resource.status == 410) {
t._needsRemoval = true;
LOG("server indicated " + resource.uri.spec + " is gone. flagging for removal");
}
resource.destroy();
for (let i = 0; i < t._observers.length; i++)
t._observers[i].onError(t);
};
// If we don't have the generator, download it now. After it downloads,
// we'll re-call this method to continue updating the microsummary.
if (!this.generator.loaded) {
// If this generator is identified by a URN, then it's a local generator
// that should have been cached on application start, so it's missing.
if (this.generator.uri.scheme == "urn") {
// If it was installed via nsSidebar::addMicrosummaryGenerator (i.e. it
// has a URN that identifies the source URL from which we installed it),
// try to reinstall it (once).
if (/^source:/.test(this.generator.uri.path)) {
this._reinstallMissingGenerator();
return;
}
else
throw "missing local generator: " + this.generator.uri.spec;
}
LOG("generator not yet loaded; downloading it");
var generatorCallback =
function MS_generatorCallback(resource) {
try { t._handleGeneratorLoad(resource) }
finally { resource.destroy() }
};
var resource = new MicrosummaryResource(this.generator.uri);
resource.load(generatorCallback, errorCallback);
return;
}
// If we need the page content, and we don't have it, download it now.
// Afterwards we'll re-call this method to continue updating the microsummary.
if (this.generator.needsPageContent && !this.pageContent) {
LOG("page content not yet loaded; downloading it");
var pageCallback =
function MS_pageCallback(resource) {
try { t._handlePageLoad(resource) }
finally { resource.destroy() }
};
var resource = new MicrosummaryResource(this.pageURI);
resource.load(pageCallback, errorCallback);
return;
}
LOG("generator (and page, if needed) both loaded; generating microsummary");
// Now that we have both the generator and (if needed) the page content,
// generate the microsummary, then let the observers know about it.
this._content = this.generator.generateMicrosummary(this.pageContent);
this._updateInterval = this.generator.calculateUpdateInterval(this.pageContent);
this.pageContent = null;
for ( var i = 0; i < this._observers.length; i++ )
this._observers[i].onContentLoaded(this);
LOG("generated microsummary: " + this.content);
},
_handleGeneratorLoad: function MS__handleGeneratorLoad(resource) {
LOG(this.generator.uri.spec + " microsummary generator downloaded");
if (resource.isXML)
this.generator.initFromXML(resource.content);
else if (resource.contentType == "text/plain")
this.generator.initFromText(resource.content);
else if (resource.contentType == "text/html")
this.generator.initFromText(resource.content.body.textContent);
else
throw("generator is neither XML nor plain text");
// Only trigger a [content] update if we were able to init the generator.
if (this.generator.loaded)
this.update();
},
_handlePageLoad: function MS__handlePageLoad(resource) {
if (!resource.isXML && resource.contentType != "text/html")
throw("page is neither HTML nor XML");
this.pageContent = resource.content;
this.update();
},
/**
* Try to reinstall a missing local generator that was originally installed
* from a URL using nsSidebar::addMicrosumaryGenerator.
*
*/
_reinstallMissingGenerator: function MS__reinstallMissingGenerator() {
LOG("attempting to reinstall missing generator " + this.generator.uri.spec);
var t = this;
var loadCallback =
function MS_missingGeneratorLoadCallback(resource) {
try { t._handleMissingGeneratorLoad(resource) }
finally { resource.destroy() }
};
var errorCallback =
function MS_missingGeneratorErrorCallback(resource) {
try { t._handleMissingGeneratorError(resource) }
finally { resource.destroy() }
};
try {
// Extract the URI from which the generator was originally installed.
var sourceURL = this.generator.uri.path.replace(/^source:/, "");
var sourceURI = this._uri(sourceURL);
var resource = new MicrosummaryResource(sourceURI);
resource.load(loadCallback, errorCallback);
}
catch(ex) {
Cu.reportError(ex);
this._handleMissingGeneratorError();
}
},
/**
* Handle a load event for a missing local generator by trying to reinstall
* the generator. If this fails, call _handleMissingGeneratorError to unset
* microsummaries for bookmarks using this generator so we don't repeatedly
* try to reinstall the generator, creating too much traffic to the website
* from which we downloaded it.
*
* @param resource
* the nsIMicrosummaryResource representing the downloaded generator
*
*/
_handleMissingGeneratorLoad: function MS__handleMissingGeneratorLoad(resource) {
try {
// Make sure the generator is XML, since local generators have to be.
if (!resource.isXML)
throw("downloaded, but not XML " + this.generator.uri.spec);
// Store the generator's ID in its XML definition.
var generatorID = this.generator.uri.spec;
resource.content.documentElement.setAttribute("uri", generatorID);
// Reinstall the generator and replace our placeholder generator object
// with the newly installed generator.
this.generator = this._mss.installGenerator(resource.content);
// A reinstalled generator should always be loaded. But just in case
// it isn't, throw an error so we don't get into an infinite loop
// (otherwise this._update would try again to reinstall it).
if (!this.generator.loaded)
throw("supposedly installed, but not in cache " + this.generator.uri.spec);
}
catch(ex) {
Cu.reportError(ex);
this._handleMissingGeneratorError(resource);
return;
}
LOG("reinstall succeeded; resuming update " + this.generator.uri.spec);
this.update();
},
/**
* Handle an error event for a missing local generator load by unsetting
* the microsummaries for bookmarks using this generator so we don't
* repeatedly try to reinstall the generator, creating too much traffic
* to the website from which we downloaded it.
*
* @param resource
* the nsIMicrosummaryResource representing the downloaded generator
*
*/
_handleMissingGeneratorError: function MS__handleMissingGeneratorError(resource) {
LOG("reinstall failed; removing microsummaries " + this.generator.uri.spec);
var bookmarks = this._mss.getBookmarks();
while (bookmarks.hasMoreElements()) {
var bookmarkID = bookmarks.getNext();
var microsummary = this._mss.getMicrosummary(bookmarkID);
if (microsummary.generator.uri.equals(this.generator.uri)) {
LOG("removing microsummary for " + microsummary.pageURI.spec);
this._mss.removeMicrosummary(bookmarkID);
}
}
}
};
function MicrosummaryGenerator(aURI, aLocalURI, aName) {
this._uri = aURI || null;
this._localURI = aLocalURI || null;
this._name = aName || null;
this._loaded = false;
this._rules = [];
this._template = null;
this._content = null;
}
MicrosummaryGenerator.prototype = {
// IO Service
__ios: null,
get _ios() {
if (!this.__ios)
this.__ios = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
return this.__ios;
},
// nsISupports
QueryInterface: XPCOMUtils.generateQI([Ci.nsIMicrosummaryGenerator]),
// nsIMicrosummaryGenerator
// Normally this is just the URL from which we download the generator,
// but for generators stored in the app or profile generators directory
// it's the value of the generator tag's "uri" attribute (or its local URI
// should the "uri" attribute be missing).
get uri() { return this._uri || this.localURI },
// For generators bundled with the browser or installed by the user,
// the local URI is the URI of the local file containing the generator XML.
get localURI() { return this._localURI },
get name() { return this._name },
get loaded() { return this._loaded },
equals: function(aOther) {
// XXX: could the uri attribute for an exposed generator ever be null?
return aOther.uri.equals(this.uri);
},
/**
* Determines whether or not the generator applies to a given URI.
* By default, the generator does not apply to any URI. In order for it
* to apply to a URI, the URI must match one or more of the generator's
* "include" rules and not match any of the generator's "exclude" rules.
*
* @param uri
* the URI to test to see if this generator applies to it
*
* @returns boolean
* whether or not the generator applies to the given URI
*
*/
appliesToURI: function(uri) {
var applies = false;
for ( var i = 0 ; i < this._rules.length ; i++ ) {
var rule = this._rules[i];
switch (rule.type) {
case "include":
if (rule.regexp.test(uri.spec))
applies = true;
break;
case "exclude":
if (rule.regexp.test(uri.spec))
return false;
break;
}
}
return applies;
},
get needsPageContent() {
if (this._template)
return true;
if (this._content)
return false;
throw("needsPageContent called on uninitialized microsummary generator");
},
/**
* Initializes a generator from text content. Generators initialized
* from text content merely return that content when their generate() method
* gets called.
*
* @param text
* the text content
*/
initFromText: function(text) {
this._content = text;
this._loaded = true;
},
/**
* Initializes a generator from an XML description of it.
*
* @param xmlDocument
* An XMLDocument object describing a microsummary generator.
*
*/
initFromXML: function(xmlDocument) {
// XXX Make sure the argument is a valid generator XML document.
// XXX I would have wanted to retrieve the info from the XML via E4X,
// but we'll need to pass the XSLT transform sheet to the XSLT processor,
// and the processor can't deal with an E4X-wrapped template node.
// XXX Right now the code retrieves the first "generator" element
// in the microsummaries namespace, regardless of whether or not
// it's the root element. Should it matter?
var generatorNode = xmlDocument.getElementsByTagNameNS(MICSUM_NS, "generator")[0];
if (!generatorNode)
throw Cr.NS_ERROR_FAILURE;
this._name = generatorNode.getAttribute("name");
// We have to retrieve the URI from local generators via the "uri" attribute
// of its generator tag.
if (this.localURI && generatorNode.hasAttribute("uri"))
this._uri = this._ios.newURI(generatorNode.getAttribute("uri"), null, null);
function getFirstChildByTagName(tagName, parentNode, namespace) {
var nodeList = parentNode.getElementsByTagNameNS(namespace, tagName);
for (var i = 0; i < nodeList.length; i++) {
// Make sure that the node is a direct descendent of the generator node
if (nodeList[i].parentNode == parentNode)
return nodeList[i];
}
return null;
}
// Slurp the include/exclude rules that determine the pages to which
// this generator applies. Order is important, so we add the rules
// in the order in which they appear in the XML.
this._rules.splice(0);
var pages = getFirstChildByTagName("pages", generatorNode, MICSUM_NS);
if (pages) {
// XXX Make sure the pages tag exists.
for ( var i = 0; i < pages.childNodes.length ; i++ ) {
var node = pages.childNodes[i];
if (node.nodeType != node.ELEMENT_NODE ||
node.namespaceURI != MICSUM_NS ||
(node.nodeName != "include" && node.nodeName != "exclude"))
continue;
var urlRegexp = node.textContent.replace(/^\s+|\s+$/g, "");
this._rules.push({ type: node.nodeName, regexp: new RegExp(urlRegexp) });
}
}
// allow the generators to set individual update values (even varying
// depending on certain XPath expressions)
var update = getFirstChildByTagName("update", generatorNode, MICSUM_NS);
if (update) {
function _parseInterval(string) {
// convert from minute fractions to milliseconds
// and ensure a minimum value of 1 minute
return Math.round(Math.max(parseFloat(string) || 0, 1) * 60 * 1000);
}
this._unconditionalUpdateInterval =
update.hasAttribute("interval") ?
_parseInterval(update.getAttribute("interval")) : null;
// collect the <condition expression="XPath Expression" interval="time"/> clauses
this._updateIntervals = new Array();
for (i = 0; i < update.childNodes.length; i++) {
node = update.childNodes[i];
if (node.nodeType != node.ELEMENT_NODE || node.namespaceURI != MICSUM_NS ||
node.nodeName != "condition")
continue;
if (!node.getAttribute("expression") || !node.getAttribute("interval")) {
LOG("ignoring incomplete conditional update interval for " + this.uri.spec);
continue;
}
this._updateIntervals.push({
expression: node.getAttribute("expression"),
interval: _parseInterval(node.getAttribute("interval"))
});
}
}
var templateNode = getFirstChildByTagName("template", generatorNode, MICSUM_NS);
if (templateNode) {
this._template = getFirstChildByTagName("transform", templateNode, XSLT_NS) ||
getFirstChildByTagName("stylesheet", templateNode, XSLT_NS);
}
// XXX Make sure the template is a valid XSL transform sheet.
this._loaded = true;
},
generateMicrosummary: function MSD_generateMicrosummary(pageContent) {
var content;
if (this._content)
content = this._content;
else if (this._template)
content = this._processTemplate(pageContent);
else
throw("generateMicrosummary called on uninitialized microsummary generator");
// Clean up the output
content = content.replace(/^\s+|\s+$/g, "");
if (content.length > MAX_SUMMARY_LENGTH)
content = content.substring(0, MAX_SUMMARY_LENGTH);
return content;
},
calculateUpdateInterval: function MSD_calculateUpdateInterval(doc) {
if (this._content || !this._updateIntervals || !doc)
return null;
for (var i = 0; i < this._updateIntervals.length; i++) {
try {
if (doc.evaluate(this._updateIntervals[i].expression, doc, null,
Ci.nsIDOMXPathResult.BOOLEAN_TYPE, null).booleanValue)
return this._updateIntervals[i].interval;
}
catch (ex) {
Cu.reportError(ex);
// remove the offending conditional update interval
this._updateIntervals.splice(i--, 1);
}
}
return this._unconditionalUpdateInterval;
},
_processTemplate: function MSD__processTemplate(doc) {
LOG("processing template " + this._template + " against document " + doc);
// XXX Should we just have one global instance of the processor?
var processor = Cc["@mozilla.org/document-transformer;1?type=xslt"].
createInstance(Ci.nsIXSLTProcessor);
// Turn off document loading of all kinds (document(), <include>, <import>)
// for security (otherwise local generators would be able to load local files).
processor.flags |= Ci.nsIXSLTProcessorPrivate.DISABLE_ALL_LOADS;
processor.importStylesheet(this._template);
var fragment = processor.transformToFragment(doc, doc);
LOG("template processing result: " + fragment.textContent);
// XXX When we support HTML microsummaries we'll need to do something
// more sophisticated than just returning the text content of the fragment.
return fragment.textContent;
},
saveXMLToFile: function MSD_saveXMLToFile(xmlDefinition) {
var file = this.localURI.QueryInterface(Ci.nsIFileURL).file.clone();
LOG("saving definition to " + file.path);
// Write the generator XML to the local file.
var outputStream = Cc["@mozilla.org/network/safe-file-output-stream;1"].
createInstance(Ci.nsIFileOutputStream);
var localFile = file.QueryInterface(Ci.nsILocalFile);
outputStream.init(localFile, (MODE_WRONLY | MODE_TRUNCATE | MODE_CREATE),
PERMS_FILE, 0);
var serializer = Cc["@mozilla.org/xmlextras/xmlserializer;1"].
createInstance(Ci.nsIDOMSerializer);
serializer.serializeToStream(xmlDefinition, outputStream, null);
if (outputStream instanceof Ci.nsISafeOutputStream) {
try { outputStream.finish() }
catch (e) { outputStream.close() }
}
else
outputStream.close();
},
update: function MSD_update() {
// Update this generator if it was downloaded from a remote source and has
// been modified since we last downloaded it.
var genURI = this.uri;
if (genURI && /^urn:source:/i.test(genURI.spec)) {
let genURL = genURI.spec.replace(/^urn:source:/, "");
genURI = this._ios.newURI(genURL, null, null);
}
// Only continue if we have a valid remote URI
if (!genURI || !/^https?/.test(genURI.scheme)) {
LOG("generator did not have valid URI; skipping update: " + genURI.spec);
return;
}
// We use a HEAD request to check if the generator has been modified since
// the last time we downloaded it. If it has, we move to _preformUpdate() to
// actually download and save the new generator.
var t = this;
var loadCallback = function(resource) {
if (resource.status != 304)
t._performUpdate(genURI);
else
LOG("generator is already up to date: " + genURI.spec);
resource.destroy();
};
var errorCallback = function(resource) {
resource.destroy();
};
var file = this.localURI.QueryInterface(Ci.nsIFileURL).file.clone();
var lastmod = new Date(file.lastModifiedTime);
LOG("updating generator: " + genURI.spec);
var resource = new MicrosummaryResource(genURI);
resource.lastMod = lastmod.toUTCString();
resource.method = "HEAD";
resource.load(loadCallback, errorCallback);
},
_performUpdate: function MSD__performUpdate(uri) {
var t = this;
var loadCallback = function(resource) {
try { t._handleUpdateLoad(resource) }
finally { resource.destroy() }
};
var errorCallback = function(resource) {
resource.destroy();
};
var resource = new MicrosummaryResource(uri);
resource.load(loadCallback, errorCallback);
},
_handleUpdateLoad: function MSD__handleUpdateLoad(resource) {
if (!resource.isXML)
throw("update failed, downloaded resource is not XML: " + this.uri.spec);
// Preserve the generator's ID.
// XXX Check for redirects and update the URI if it changes.
var generatorID = this.uri.spec;
resource.content.documentElement.setAttribute("uri", generatorID);
// Reinitialize this generator with the newly downloaded XML and save to disk.
this.initFromXML(resource.content);
this.saveXMLToFile(resource.content);
// Let observers know we've updated this generator
var obs = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
obs.notifyObservers(this, "microsummary-generator-updated", null);
}
};
// Microsummary sets are collections of microsummaries. They allow callers
// to register themselves as observers of the set, and when any microsummary
// in the set changes, the observers get notified. Thus a caller can observe
// the set instead of each individual microsummary.
function MicrosummarySet() {
this._observers = [];
this._elements = [];
}
MicrosummarySet.prototype = {
// IO Service
__ios: null,
get _ios() {
if (!this.__ios)
this.__ios = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
return this.__ios;
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIMicrosummarySet,
Ci.nsIMicrosummaryObserver]),
// nsIMicrosummaryObserver
onContentLoaded: function MSSet_onContentLoaded(microsummary) {
for ( var i = 0; i < this._observers.length; i++ )
this._observers[i].onContentLoaded(microsummary);
},
onError: function MSSet_onError(microsummary) {
for ( var i = 0; i < this._observers.length; i++ )
this._observers[i].onError(microsummary);
},
// nsIMicrosummarySet
addObserver: function MSSet_addObserver(observer) {
if (this._observers.length == 0) {
for ( var i = 0 ; i < this._elements.length ; i++ )
this._elements[i].addObserver(this);
}
// Register the observer, but only if it isn't already registered,
// so that we don't call the same observer twice for any given change.
if (this._observers.indexOf(observer) == -1)
this._observers.push(observer);
},
removeObserver: function MSSet_removeObserver(observer) {
//NS_ASSERT(this._observers.indexOf(observer) != -1,
// "can't remove microsummary observer " + observer + ": not registered");
//this._observers =
// this._observers.filter(function(i) { observer != i });
if (this._observers.indexOf(observer) != -1)
this._observers.splice(this._observers.indexOf(observer), 1);
if (this._observers.length == 0) {
for ( var i = 0 ; i < this._elements.length ; i++ )
this._elements[i].removeObserver(this);
}
},
extractFromPage: function MSSet_extractFromPage(resource) {
if (!resource.isXML && resource.contentType != "text/html")
throw("page is neither HTML nor XML");
// XXX Handle XML documents, whose microsummaries are specified
// via processing instructions.
var links = resource.content.getElementsByTagName("link");
for ( var i = 0; i < links.length; i++ ) {
var link = links[i];
if(!link.hasAttribute("rel"))
continue;
var relAttr = link.getAttribute("rel");
// The attribute's value can be a space-separated list of link types,
// check to see if "microsummary" is one of them.
var linkTypes = relAttr.split(/\s+/);
if (!linkTypes.some( function(v) { return v.toLowerCase() == "microsummary"; }))
continue;
// Look for a TITLE attribute to give the generator a nice name in the UI.
var linkTitle = link.getAttribute("title");
// Unlike the "href" attribute, the "href" property contains
// an absolute URI spec, so we use it here to create the URI.
var generatorURI = this._ios.newURI(link.href,
resource.content.characterSet,
null);
if (!/^https?$/i.test(generatorURI.scheme)) {
LOG("can't load generator " + generatorURI.spec + " from page " +
resource.uri.spec);
continue;
}
var generator = new MicrosummaryGenerator(generatorURI, null, linkTitle);
var microsummary = new Microsummary(resource.uri, generator);
if (!this.hasItemForMicrosummary(microsummary))
this.AppendElement(microsummary);
}
},
/**
* Determines whether the given microsumary is already represented in the
* set.
*/
hasItemForMicrosummary: function MSSet_hasItemForMicrosummary(aMicrosummary) {
for (var i = 0; i < this._elements.length; i++) {
if (this._elements[i].equals(aMicrosummary))
return true;
}
return false;
},
// XXX Turn this into a complete implementation of nsICollection?
AppendElement: function MSSet_AppendElement(element) {
// Query the element to a microsummary.
// XXX Should we NS_ASSERT if this fails?
element = element.QueryInterface(Ci.nsIMicrosummary);
if (this._elements.indexOf(element) == -1) {
this._elements.push(element);
element.addObserver(this);
}
// Notify observers that an element has been appended.
for ( var i = 0; i < this._observers.length; i++ )
this._observers[i].onElementAppended(element);
},
Enumerate: function MSSet_Enumerate() {
return new ArrayEnumerator(this._elements);
}
};
/**
* An enumeration of items in a JS array.
* @constructor
*/
function ArrayEnumerator(aItems) {
if (aItems) {
for (var i = 0; i < aItems.length; ++i) {
if (!aItems[i])
aItems.splice(i--, 1);
}
this._contents = aItems;
} else {
this._contents = [];
}
}
ArrayEnumerator.prototype = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsISimpleEnumerator]),
_index: 0,
hasMoreElements: function() {
return this._index < this._contents.length;
},
getNext: function() {
return this._contents[this._index++];
}
};
/**
* Outputs aText to the JavaScript console as well as to stdout if the
* microsummary logging pref (browser.microsummary.log) is set to true.
*
* @param aText
* the text to log
*/
function LOG(aText) {
var f = arguments.callee;
if (!("_enabled" in f))
f._enabled = getPref("browser.microsummary.log", false);
if (f._enabled) {
dump("*** Microsummaries: " + aText + "\n");
var consoleService = Cc["@mozilla.org/consoleservice;1"].
getService(Ci.nsIConsoleService);
consoleService.logStringMessage(aText);
}
}
/**
* A resource (page, microsummary, generator, etc.) identifiable by URI.
* This object abstracts away much of the code for loading resources
* and parsing their content if they are XML or HTML.
*
* @constructor
*
* @param uri
* the location of the resource
*
*/
function MicrosummaryResource(uri) {
// Make sure we're not loading javascript: or data: URLs, which could
// take advantage of the load to run code with chrome: privileges.
// XXX Perhaps use nsIScriptSecurityManager.checkLoadURI instead.
if (!(uri.schemeIs("http") || uri.schemeIs("https") || uri.schemeIs("file")))
throw NS_ERROR_DOM_BAD_URI;
this._uri = uri;
this._content = null;
this._contentType = null;
this._isXML = false;
this.__authFailed = false;
this._status = null;
this._method = "GET";
this._lastMod = null;
// A function to call when we finish loading/parsing the resource.
this._loadCallback = null;
// A function to call if we get an error while loading/parsing the resource.
this._errorCallback = null;
// A hidden iframe to parse HTML content.
this._iframe = null;
}
MicrosummaryResource.prototype = {
// IO Service
__ios: null,
get _ios() {
if (!this.__ios)
this.__ios = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
return this.__ios;
},
get uri() {
return this._uri;
},
get content() {
return this._content;
},
get contentType() {
return this._contentType;
},
get isXML() {
return this._isXML;
},
get status() { return this._status },
set status(aStatus) { this._status = aStatus },
get method() { return this._method },
set method(aMethod) { this._method = aMethod },
get lastMod() { return this._lastMod },
set lastMod(aMod) { this._lastMod = aMod },
// Implement notification callback interfaces so we can suppress UI
// and abort loads for bad SSL certs and HTTP authorization requests.
// Interfaces this component implements.
interfaces: [Ci.nsIAuthPromptProvider,
Ci.nsIAuthPrompt,
Ci.nsIBadCertListener2,
Ci.nsISSLErrorListener,
Ci.nsIPrompt,
Ci.nsIProgressEventSink,
Ci.nsIInterfaceRequestor,
Ci.nsISupports],
// nsISupports
QueryInterface: function MSR_QueryInterface(iid) {
if (!this.interfaces.some( function(v) { return iid.equals(v) } ))
throw Cr.NS_ERROR_NO_INTERFACE;
// nsIAuthPrompt and nsIPrompt need separate implementations because
// their method signatures conflict. The other interfaces we implement
// within MicrosummaryResource itself.
switch(iid) {
case Ci.nsIAuthPrompt:
return this.authPrompt;
case Ci.nsIPrompt:
return this.prompt;
default:
return this;
}
},
// nsIInterfaceRequestor
getInterface: function MSR_getInterface(iid) {
return this.QueryInterface(iid);
},
// nsIBadCertListener2
// Suppress any certificate errors
notifyCertProblem: function MSR_certProblem(socketInfo, status, targetSite) {
return true;
},
// nsISSLErrorListener
// Suppress any ssl errors
notifySSLError: function MSR_SSLError(socketInfo, error, targetSite) {
return true;
},
// Suppress UI and abort loads for files secured by authentication.
// Auth requests appear to succeed when we cancel them (since the server
// redirects us to a "you're not authorized" page), so we have to set a flag
// to let the load handler know to treat the load as a failure.
get _authFailed() { return this.__authFailed; },
set _authFailed(newValue) { return this.__authFailed = newValue },
// nsIAuthPromptProvider
getAuthPrompt: function(aPromptReason, aIID) {
this._authFailed = true;
throw Cr.NS_ERROR_NOT_AVAILABLE;
},
// HTTP always requests nsIAuthPromptProvider first, so it never needs
// nsIAuthPrompt, but not all channels use nsIAuthPromptProvider, so we
// implement nsIAuthPrompt too.
// nsIAuthPrompt
get authPrompt() {
var resource = this;
return {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIPrompt]),
prompt: function(dialogTitle, text, passwordRealm, savePassword, defaultText, result) {
resource._authFailed = true;
return false;
},
promptUsernameAndPassword: function(dialogTitle, text, passwordRealm, savePassword, user, pwd) {
resource._authFailed = true;
return false;
},
promptPassword: function(dialogTitle, text, passwordRealm, savePassword, pwd) {
resource._authFailed = true;
return false;
}
};
},
// nsIPrompt
get prompt() {
var resource = this;
return {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIPrompt]),
alert: function(dialogTitle, text) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
alertCheck: function(dialogTitle, text, checkMessage, checkValue) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
confirm: function(dialogTitle, text) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
confirmCheck: function(dialogTitle, text, checkMessage, checkValue) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
confirmEx: function(dialogTitle, text, buttonFlags, button0Title, button1Title, button2Title, checkMsg, checkValue) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
prompt: function(dialogTitle, text, value, checkMsg, checkValue) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
},
promptPassword: function(dialogTitle, text, password, checkMsg, checkValue) {
resource._authFailed = true;
return false;
},
promptUsernameAndPassword: function(dialogTitle, text, username, password, checkMsg, checkValue) {
resource._authFailed = true;
return false;
},
select: function(dialogTitle, text, count, selectList, outSelection) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
}
};
},
// XXX We implement nsIProgressEventSink because otherwise bug 253127
// would cause too many extraneous errors to get reported to the console.
// Fortunately this doesn't screw up XMLHttpRequest, because it ensures
// that its implementation of nsIProgressEventSink will always get called
// in addition to whatever notification callbacks we set on the channel.
// nsIProgressEventSink
onProgress: function(aRequest, aContext, aProgress, aProgressMax) {},
onStatus: function(aRequest, aContext, aStatus, aStatusArg) {},
/**
* Initialize the resource from an existing DOM document object.
*
* @param document
* a DOM document object
*
*/
initFromDocument: function MSR_initFromDocument(document) {
this._content = document;
this._contentType = document.contentType;
// Normally we set this property based on whether or not
// XMLHttpRequest parsed the content into an XML document object,
// but since we already have the content, we have to analyze
// its content type ourselves to see if it is XML.
this._isXML = (this.contentType == "text/xml" ||
this.contentType == "application/xml" ||
/^.+\/.+\+xml$/.test(this.contentType));
},
/**
* Destroy references to avoid leak-causing cycles. Instantiators must call
* this method on all instances they instantiate once they're done with them.
*
*/
destroy: function MSR_destroy() {
this._uri = null;
this._content = null;
this._loadCallback = null;
this._errorCallback = null;
this._loadTimer = null;
this._authFailed = false;
if (this._iframe) {
if (this._iframe && this._iframe.parentNode)
this._iframe.parentNode.removeChild(this._iframe);
this._iframe = null;
}
},
/**
* Load the resource.
*
* @param loadCallback
* a function to invoke when the resource finishes loading
* @param errorCallback
* a function to invoke when an error occurs during the load
*
*/
load: function MSR_load(loadCallback, errorCallback) {
LOG(this.uri.spec + " loading");
this._loadCallback = loadCallback;
this._errorCallback = errorCallback;
var request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance();
var loadHandler = {
_self: this,
handleEvent: function MSR_loadHandler_handleEvent(event) {
if (this._self._loadTimer)
this._self._loadTimer.cancel();
this._self.status = event.target.status;
if (this._self._authFailed || this._self.status >= 400) {
// Technically the request succeeded, but we treat it as a failure,
// since we won't be able to extract anything relevant from the result.
// XXX For now HTTP is the only protocol we handle that might fail
// auth. This message will need to change once we support FTP, which
// returns 0 for all statuses.
LOG(this._self.uri.spec + " load failed; HTTP status: " + this._self.status);
try { this._self._handleError(event) }
finally { this._self = null }
}
else if (event.target.channel.contentType == "multipart/x-mixed-replace") {
// Technically the request succeeded, but we treat it as a failure,
// since we aren't able to handle multipart content.
LOG(this._self.uri.spec + " load failed; contains multipart content");
try { this._self._handleError(event) }
finally { this._self = null }
}
else {
LOG(this._self.uri.spec + " load succeeded; invoking callback");
try { this._self._handleLoad(event) }
finally { this._self = null }
}
}
};
var errorHandler = {
_self: this,
handleEvent: function MSR_errorHandler_handleEvent(event) {
if (this._self._loadTimer)
this._self._loadTimer.cancel();
LOG(this._self.uri.spec + " load failed");
try { this._self._handleError(event) }
finally { this._self = null }
}
};
// cancel loads that take too long
// timeout specified in seconds at browser.microsummary.requestTimeout,
// or 300 seconds (five minutes)
var timeout = getPref("browser.microsummary.requestTimeout", 300) * 1000;
var timerObserver = {
_self: this,
observe: function MSR_timerObserver_observe() {
LOG("timeout loading microsummary resource " + this._self.uri.spec + ", aborting request");
request.abort();
try { this._self.destroy() }
finally { this._self = null }
}
};
this._loadTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
this._loadTimer.init(timerObserver, timeout, Ci.nsITimer.TYPE_ONE_SHOT);
request = request.QueryInterface(Ci.nsIDOMEventTarget);
request.addEventListener("load", loadHandler, false);
request.addEventListener("error", errorHandler, false);
request = request.QueryInterface(Ci.nsIXMLHttpRequest);
request.open(this.method, this.uri.spec, true);
request.setRequestHeader("X-Moz", "microsummary");
if (this.lastMod)
request.setRequestHeader("If-Modified-Since", this.lastMod);
// Register ourselves as a listener for notification callbacks so we
// can handle authorization requests and SSL issues like cert mismatches.
// XMLHttpRequest will handle the notifications we don't handle.
request.channel.notificationCallbacks = this;
// If this is a bookmarked resource, and the bookmarks service recorded
// its charset in the bookmarks datastore the last time the user visited it,
// then specify the charset in the channel so XMLHttpRequest loads
// the resource correctly.
try {
var resolver = Cc["@mozilla.org/embeddor.implemented/bookmark-charset-resolver;1"].
getService(Ci.nsICharsetResolver);
if (resolver) {
var charset = resolver.requestCharset(null, request.channel, {}, {});
if (charset != "");
request.channel.contentCharset = charset;
}
}
catch(ex) {}
request.send(null);
},
_handleLoad: function MSR__handleLoad(event) {
var request = event.target;
if (request.responseXML) {
this._isXML = true;
// XXX Figure out the parsererror format and log a specific error.
if (request.responseXML.documentElement.nodeName == "parsererror") {
this._handleError(event);
return;
}
this._content = request.responseXML;
this._contentType = request.channel.contentType;
this._loadCallback(this);
}
else if (request.channel.contentType == "text/html") {
this._parse(request.responseText);
}
else {
// This catches text/plain as well as any other content types
// not accounted for by the content type-specific code above.
this._content = request.responseText;
this._contentType = request.channel.contentType;
this._loadCallback(this);
}
},
_handleError: function MSR__handleError(event) {
// Call the error callback, then destroy ourselves to prevent memory leaks.
try { if (this._errorCallback) this._errorCallback(this) }
finally { this.destroy() }
},
/**
* Parse a string of HTML text. Used by _load() when it retrieves HTML.
* We do this via hidden XUL iframes, which according to bz is the best way
* to do it currently, since bug 102699 is hard to fix.
*
* @param htmlText
* a string containing the HTML content
*
*/
_parse: function MSR__parse(htmlText) {
// Find a window to stick our hidden iframe into.
var windowMediator = Cc['@mozilla.org/appshell/window-mediator;1'].
getService(Ci.nsIWindowMediator);
var window = windowMediator.getMostRecentWindow("navigator:browser");
// XXX We can use other windows, too, so perhaps we should try to get
// some other window if there's no browser window open. Perhaps we should
// even prefer other windows, since there's less chance of any browser
// window machinery like throbbers treating our load like one initiated
// by the user.
if (!window) {
this._handleError(event);
return;
}
var document = window.document;
var rootElement = document.documentElement;
// Create an iframe, make it hidden, and secure it against untrusted content.
this._iframe = document.createElement('iframe');
this._iframe.setAttribute("collapsed", true);
this._iframe.setAttribute("type", "content");
// Insert the iframe into the window, creating the doc shell.
rootElement.appendChild(this._iframe);
// When we insert the iframe into the window, it immediately starts loading
// about:blank, which we don't need and could even hurt us (for example
// by triggering bugs like bug 344305), so cancel that load.
var webNav = this._iframe.docShell.QueryInterface(Ci.nsIWebNavigation);
webNav.stop(Ci.nsIWebNavigation.STOP_NETWORK);
// Turn off JavaScript and auth dialogs for security and other things
// to reduce network load.
// XXX We should also turn off CSS.
this._iframe.docShell.allowJavascript = false;
this._iframe.docShell.allowAuth = false;
this._iframe.docShell.allowPlugins = false;
this._iframe.docShell.allowMetaRedirects = false;
this._iframe.docShell.allowSubframes = false;
this._iframe.docShell.allowImages = false;
var parseHandler = {
_self: this,
handleEvent: function MSR_parseHandler_handleEvent(event) {
event.target.removeEventListener("DOMContentLoaded", this, false);
try { this._self._handleParse(event) }
finally { this._self = null }
}
};
// Convert the HTML text into an input stream.
var converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"].
createInstance(Ci.nsIScriptableUnicodeConverter);
converter.charset = "UTF-8";
var stream = converter.convertToInputStream(htmlText);
// Set up a channel to load the input stream.
var channel = Cc["@mozilla.org/network/input-stream-channel;1"].
createInstance(Ci.nsIInputStreamChannel);
channel.setURI(this._uri);
channel.contentStream = stream;
// Load in the background so we don't trigger web progress listeners.
var request = channel.QueryInterface(Ci.nsIRequest);
request.loadFlags |= Ci.nsIRequest.LOAD_BACKGROUND;
// Specify the content type since we're not loading content from a server,
// so it won't get specified for us, and if we don't specify it ourselves,
// then Firefox will prompt the user to download content of "unknown type".
var baseChannel = channel.QueryInterface(Ci.nsIChannel);
baseChannel.contentType = "text/html";
// Load as UTF-8, which it'll always be, because XMLHttpRequest converts
// the text (i.e. XMLHTTPRequest.responseText) from its original charset
// to UTF-16, then the string input stream component converts it to UTF-8.
baseChannel.contentCharset = "UTF-8";
// Register the parse handler as a load event listener and start the load.
// Listen for "DOMContentLoaded" instead of "load" because background loads
// don't fire "load" events.
this._iframe.addEventListener("DOMContentLoaded", parseHandler, true);
var uriLoader = Cc["@mozilla.org/uriloader;1"].getService(Ci.nsIURILoader);
uriLoader.openURI(channel, true, this._iframe.docShell);
},
/**
* Handle a load event for the iframe-based parser.
*
* @param event
* the event object representing the load event
*
*/
_handleParse: function MSR__handleParse(event) {
// XXX Make sure the parse was successful?
this._content = this._iframe.contentDocument;
this._contentType = this._iframe.contentDocument.contentType;
this._loadCallback(this);
}
};
/**
* Get a resource currently loaded into a browser window. Checks windows
* one at a time, starting with the frontmost (a.k.a. most recent) one.
*
* @param uri
* the URI of the resource
*
* @returns a Resource object, if the resource is currently loaded
* into a browser window; otherwise null
*
*/
function getLoadedMicrosummaryResource(uri) {
var mediator = Cc["@mozilla.org/appshell/window-mediator;1"].
getService(Ci.nsIWindowMediator);
// Apparently the Z order enumerator is broken on Linux per bug 156333.
//var windows = mediator.getZOrderDOMWindowEnumerator("navigator:browser", true);
var windows = mediator.getEnumerator("navigator:browser");
while (windows.hasMoreElements()) {
var win = windows.getNext();
var tabBrowser = win.document.getElementById("content");
for ( var i = 0; i < tabBrowser.browsers.length; i++ ) {
var browser = tabBrowser.browsers[i];
if (uri.equals(browser.currentURI)) {
var resource = new MicrosummaryResource(uri);
resource.initFromDocument(browser.contentDocument);
return resource;
}
}
}
return null;
}
/**
* Get a value from a pref or a default value if the pref doesn't exist.
*
* @param prefName
* @param defaultValue
* @returns the pref's value or the default (if it is missing)
*/
function getPref(prefName, defaultValue) {
try {
var prefBranch = Cc["@mozilla.org/preferences-service;1"].
getService(Ci.nsIPrefBranch);
var type = prefBranch.getPrefType(prefName);
switch (type) {
case prefBranch.PREF_BOOL:
return prefBranch.getBoolPref(prefName);
case prefBranch.PREF_INT:
return prefBranch.getIntPref(prefName);
}
}
catch (ex) { /* return the default value */ }
return defaultValue;
}
// From http://lxr.mozilla.org/mozilla/source/browser/components/search/nsSearchService.js
/**
* Removes all characters not in the "chars" string from aName.
*
* @returns a sanitized name to be used as a filename, or a random name
* if a sanitized name cannot be obtained (if aName contains
* no valid characters).
*/
function sanitizeName(aName) {
const chars = "-abcdefghijklmnopqrstuvwxyz0123456789";
const maxLength = 60;
var name = aName.toLowerCase();
name = name.replace(/ /g, "-");
//name = name.split("").filter(function (el) {
// return chars.indexOf(el) != -1;
// }).join("");
var filteredName = "";
for ( var i = 0 ; i < name.length ; i++ )
if (chars.indexOf(name[i]) != -1)
filteredName += name[i];
name = filteredName;
if (!name) {
// Our input had no valid characters - use a random name
for (var i = 0; i < 8; ++i)
name += chars.charAt(Math.round(Math.random() * (chars.length - 1)));
}
if (name.length > maxLength)
name = name.substring(0, maxLength);
return name;
}
function NSGetModule(compMgr, fileSpec) {
return XPCOMUtils.generateModule([MicrosummaryService]);
}
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