I've successfully used jsctypes in the past but the latest version of firefox (32) has started to give me an odd error message
here is what used to work-
javascript content sends a message to a javascript extension in chrome (the extension uses ctypes to call a special device allocator. it then returns a cdata.finalizer to the content
later when the content is garbage collected the finaizer gets called to release the special device allocation
while this used to work fine, I'm now getting an exception ctypes.CDataFinalizer
Not allowed to define cross-origin object as property on [Object] or [Array] XrayWrapper
searching on Google did not seem to find anything related.
on the extension I have this code( the func... things are access methods for c code)
Any suggestions?
self.addEventListener("allocArray", function (event) {
var info = event.detail.info;
try {
var cBytes = ctypes.int32_t(info.bytes);
var cArrayId = ctypes.uint32_t(0);
var err = funcAllocArray(cBytes, cArrayId.address());
if(err !== 0) {
info.rtnCode = err;
info.arrayId = -1;
info.error = "Error: " + (err === 2)? "out of memory": "allocation failed";
} else {
info.rtnCode = 0;
info.arrayId = ctypes.CDataFinalizer(cArrayId.value, funcReleaseArray);
}
}
catch(exception) {
info.rtnCode = -1;
info.arrayId = -1;
info.error = report(exception);
}
}, true, true);
Related
I have an Angular 7 app that is using ngx-extended-pdf-viewer to render a PDF that I get as a byte array from the web.api. I have no issues rendering the PDF or even printing it from any desktop application. ngx-extended-pdf-viewer as a print button built right in. However, when trying to print from Safari on an iPhone (iOS 12) it only prints a blank page with the url at the bottom. The actual PDF does not print. With Chrome on iOS it doesn't do anything that I can see. I am pretty new to Angular and actually to mobile web development, so perhaps lack of knowledge is getting me. The PDF viewer is in a mat-tab, so not sure if maybe that is causing some issues??
I have tried other packages, but they all seem to be based on the same pdf.js code from Mozilla. Also this is the only one I've found so far that has a print. I was thinking about perhaps trying pdf.js outside of an npm package, but so far have not found solid directions on getting this to work in Angular. I'm sure it will, but all directions I have found seem to omit details. Such as, put this code in your app. They just fail to say where in the app.
From the web.api:
[HttpPost("GetPdfBytes/{PdfId}")]
public ActionResult<byte[]> GetPdfBytesId([FromBody]int id)
{
string exactPath = string.Empty;
if (id == 1)
{
exactPath = Path.GetFullPath("pdf-test.pdf");
}
else if (id == 2)
{
exactPath = Path.GetFullPath("DPP.pdf");
}
else if (id == 3)
{
exactPath = Path.GetFullPath("Request.pdf");
}
else
{
exactPath = Path.GetFullPath("Emergency Issue.pdf");
}
byte[] bytes = System.IO.File.ReadAllBytes(exactPath);
return Ok(bytes);
}
The HTML:
<mat-tab label="PDF">
<ng-template matTabContent>
<ngx-extended-pdf-viewer *ngIf="visible[2]" id="pdf3" [src]="pdfSrc3" useBrowserLocale="true" delayFirstView="1000" showSidebarButton="false"
showOpenFileButton="false" >
</ngx-extended-pdf-viewer>
</ng-template>
</mat-tab>
TypeScript:
getPDFBytesId(id: string) {
this.getPDFFromServicePdfBytesId(Number(id)).subscribe(
(data: any) => {
this.pdfSrc3 = this.convertDataURIToBinary(data);
},
error => {
console.log(error);
}
);
}
// hits the web.api
getPDFFromServicePdfBytesId(id: number): Observable<any> {
const body = id;
return this.http.post<any>('http://localhost:5000/api/values/GetPdfBytes/' + id, body);
}
// converts what we got back to a Uint8Array which is used by the viewer
convertDataURIToBinary(dataURI: string) {
const raw = window.atob(dataURI);
const rawLength = raw.length;
const array = new Uint8Array(new ArrayBuffer(rawLength));
for (let i = 0; i < rawLength; i++) {
array[i] = raw.charCodeAt(i);
}
return array;
}
We are facing this issues with our app, only in safari browser, especially on iOS devices.
Current behavior
Not sure if this is a known issue (I tried searching but found nothing). Safari for Mac appears to be silently dropping web socket connections due to inactivity/idle if the page/tab is not in focus.
The biggest issue is that in mobile iOS X is very persistent.
Steps to reproduce
Open Safari > Website loads > Put Safari in Idle and open any application or lock the device.
On wake up, Safari is closing the connection and the data is not displayed anymore, we get infinite loading of the modules where we request the data.
Expected behavior
Websockets should be kept alive via the heartbeat functionality. Not seeing this behavior in other browsers so unlikely to be the code.
Is this possibly some sort of power-saving feature that is overriding/ignoring the heartbeats?
import 'whatwg-fetch';
import Config from "../config/main";
import WS from "./websocket";
import Helpers from "./helperFunctions";
var Zergling = (function (WS, Config) {
'use strict';
var Zergling = {};
var subscriptions = {}, useWebSocket = false, sessionRequestIsInProgress = false, loginInProgress = false,
uiLogggedIn = false, // uiLogggedIn is the login state displayed in UI (sometimes it differs from real one, see delayedLogoutIfNotRestored func)
authData, session, connectionAvailable, isLoggedIn, longPollUrl;
Zergling.loginStates = {
LOGGED_OUT: 0,
LOGGED_IN: 1,
IN_PROGRESS: 2
};
Zergling.codes = { // Swarm response codes
OK: 0,
SESSION_LOST: 5,
NEED_TO_LOGIN: 12
};
function getLanguageCode (lng) {
if (Config.swarm.languageMap && Config.swarm.languageMap[lng]) {
return Config.swarm.languageMap[lng];
}
return lng;
}
//helper func for fetch
function checkStatus (response) {
if (response.status >= 200 && response.status < 300) {
return response;
} else {
var error = new Error(response.statusText);
error.response = response;
throw error;
}
}
//helper func for fetch
function parseJSON (response) {
return response.json();
}
/**
* #description returns randomly selected(taking weight into consideration) long poll url
* #returns {String} long polling URL
*/
function getLongPollUrl () {
if (!longPollUrl) {
longPollUrl = Helpers.getWeightedRandom(Config.swarm.url).url;
console.debug('long Polling URL selected:', longPollUrl);
}
return longPollUrl;
}
/**
* #description
* Applies the diff on object
* properties having null values in diff are removed from object, others' values are replaced.
*
* Also checks the 'price' field for changes and adds new field 'price_change' as sibling
* which indicates the change direction (1 - up, -1 down, null - unchanged)
*
* #param {Object} current current object
* #param {Object} diff received diff
*/
function destructivelyUpdateObject (current, diff) {
if (current === undefined || !(current instanceof Object)) {
throw new Error('wrong call');
}
for (var key in diff) {
if (!diff.hasOwnProperty(key)) continue;
var val = diff[key];
if (val === null) {
delete current[key];
} else if (typeof val !== 'object') {
current[key] = val;
} else { // diff[key] is Object
if (typeof current[key] !== 'object' || current[key] === null) {
current[key] = val;
} else {
var hasPrice = (current[key].price !== undefined);
var oldPrice;
if (hasPrice) {
oldPrice = current[key].price;
}
destructivelyUpdateObject(current[key], val);
if (hasPrice) {
current[key].price_change = (val.price === oldPrice) ? null : (oldPrice < val.price) * 2 - 1;
}
}
}
}
}
This is and iOS feature that protects users against code draining their battery...
Push notifications for background applications should be performed using iOS's push notification system rather than by keeping an open connection alive.
There are hacks around this limitation, but the truth is that the limitation is good for the users and shouldn't be circumvented.
Read the technical note in the link for more details.
I'm developing a cordova-based multi-platform web-app using sapui5 framework v1.44 and indexedDB for storing data.The app was working fine untill last ios update, 10.3.1, now it crashes when trying to write to indexedDB. I'm using put method for updating data and i did a clean install of the app. The code frame where i try to write to indexedDB is this:
writeToIDB: function (objStoreName, result, success, error) {
//Asynchronous function
var defer = Q.defer();
var res = [];
if (!!result && Array.isArray(result)) {
res = result;
} else if (!!result && result.hasOwnProperty("results") && Array.isArray(result.results)) {
res = result.results;
} else if (!!result && typeof result === 'object') {
res.push(result);
}
if (res.length >= 0) {
if (window.myDB) {
if (!window.myDB.objectStoreNames.contains(objStoreName)) {
console.log("ObjectStore for " + objStoreName + " doesn't exist");
if (error) {
error("ko")
} else {
defer.reject("ko");
}
} else {
var oTransaction = window.myDB.transaction([objStoreName], "readwrite");
var oDataStore = oTransaction.objectStore(objStoreName);
oTransaction.oncomplete = function (event) {
console.log("Transaction completed: database modification for " + objStoreName + " finished.");
if (success) {
success();
} else {
defer.resolve("ok");
}
};
oTransaction.onerror = function (event) {
console.log("Transaction for " + objStoreName + " not opened due to error. Check for duplicate items or missing properties!");
console.log(event.target.error);
if (error) {
error("ko")
} else {
defer.reject("ko");
}
};
var oRecord = {};
for (var i = 0; i < res.length; i++) {
oRecord = res[i];
oDataStore.put(oRecord);
}
}
} else {
this.createIDB().then(
function (resCreate) {
console.log("DB Created successfully");
if (!window.myDB.objectStoreNames.contains(objStoreName)) {
console.log("ObjectStore for " + objStoreName + " doesn't exist");
if (error) {
error("ko")
} else {
defer.reject("ko");
}
} else {
var oTransaction = window.myDB.transaction([objStoreName], "readwrite");
var oDataStore = oTransaction.objectStore(objStoreName);
oTransaction.oncomplete = function (event) {
console.log("Transaction completed: database modification for " + objStoreName + " finished.");
if (success) {
success();
} else {
defer.resolve("ok");
}
};
oTransaction.onerror = function (event) {
console.log("Transaction for " + objStoreName + " not opened due to error. Check for duplicate items or missing properties!");
console.log(event.target.error);
if (error) {
error("ko")
} else {
defer.reject("ko");
}
};
var oRecord = {};
for (var i = 0; i < res.length; i++) {
oRecord = res[i];
oDataStore.put(oRecord);
}
}
}.bind(this),
function (err) {
console.log("DB Creation failed");
if (error) {
error("ko")
} else {
defer.reject("ko");
}
}.bind(this)
);
}
} else {
if (error) {
error("ko")
} else {
defer.reject("ko");
}
}
if (typeof success === 'undefined' && typeof error === 'undefined') {
return defer.promise;
}
},
P.S.I have omitted parts of the code.
This was working fine with the previous version of ios, i think i had installed the 10.2.1, now it simply crashes after calling the put method. I tried upgrading now ios to the beta of 10.3.2 but the result is the same. Anyone else noticed this or have any idea of how to resolve this problem?
Thanks
K
UPDATE
I've found the issue: the complex dataTypes. Since IndexedDB supports saving and retrieving complex dataTypes, i had some properties which were arrays or objects that i used to save in some of my ObjectStores. This is definitely a big problem for me because the only workaround i can think for this is to stingify the complex fields but since i work with a lot of data this would create a big performance issue. I hope the ios developer team will find a solution for this soon enough
Are you sure every key in the res[] array is a valid key? There is a closed bug here:
https://bugs.webkit.org/show_bug.cgi?id=170000
It looks if you pass in an invalid key it will cause webkit to crash.
This fix for this will likely be contained in the next public release of iOS.
To determine what a valid key is see this section of the W3.org spec:
3.1.3 Keys
In order to efficiently retrieve records stored in an indexed database, each record is organized according to its key. A value is said to be a valid key if it is one of the following ECMAScript [ECMA-262] types: Number primitive value, String primitive value, Date object, or Array object. An Array is only a valid key if every item in the array is defined and is a valid key (i.e. sparse arrays can not be valid keys) and if the Array doesn't directly or indirectly contain itself. Any non-numeric properties on an Array are ignored, and thus do not affect whether the Array is a valid key. If the value is of type Number, it is only a valid key if it is not NaN. If the value is of type Date it is only a valid key if its [[PrimitiveValue]] internal property, as defined by [ECMA-262], is not NaN. Conforming user agents must support all valid keys as keys.
This was taken from here:
https://www.w3.org/TR/IndexedDB/#key-construct
Not sure if it's the same issue, but I had a crash on iOS 10.3 that I didnt get in any other browser. Using Dexie wrapper for indexedDB, I did a get all records from table search:
db.table.toArray(function (results) {
// process...
})
and got flames from Xcode to what looked like a threading issue in WebKit so I just added setTimeout( ... ,1) and that hacked around the problem for me.
I have a plugin which I have to support both on Chrome and Firefox browsers. The plugin does cross script loading.
In Chrome, by adding the content security policy in my manifest.json file, I could get away with it. How can I do it Firefox extension?
I couldn't find a simple solution for my problem and upon looking up some firefox plugin extensions i had to come up with my own solution as below. The below solution was tested on FF 24.0 but should work on other versions as well.
Cc["#mozilla.org/observer-service;1"].getService(Ci.nsIObserverService)
.addObserver(_httpExamineCallback, "http-on-examine-response", false);
function _httpExamineCallback(aSubject, aTopic, aData) {
var httpChannel = aSubject.QueryInterface(Ci.nsIHttpChannel);
if (httpChannel.responseStatus !== 200) {
return;
}
var cspRules;
var mycsp;
// thre is no clean way to check the presence of csp header. an exception
// will be thrown if it is not there.
// https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIHttpChannel
try {
cspRules = httpChannel.getResponseHeader("Content-Security-Policy");
mycsp = _getCspAppendingMyHostDirective(cspRules);
httpChannel.setResponseHeader('Content-Security-Policy', mycsp, false);
} catch (e) {
try {
// Fallback mechanism support
cspRules = httpChannel.getResponseHeader("X-Content-Security-Policy");
mycsp = _getCspAppendingMyHostDirective(cspRules);
httpChannel.setResponseHeader('X-Content-Security-Policy', mycsp, false);
} catch (e) {
// no csp headers defined
return;
}
}
};
/**
* #var cspRules : content security policy
* For my requirement i have to append rule just to 'script-src' directive. But you can
* modify this function to your need.
*
*/
function _getCspAppendingMyHostDirective(cspRules) {
var rules = cspRules.split(';'),
scriptSrcDefined = false,
defaultSrcIndex = -1;
for (var ii = 0; ii < rules.length; ii++) {
if ( rules[ii].toLowerCase().indexOf('script-src') != -1 ) {
rules[ii] = rules[ii] + ' <My CSP Rule gets appended here>';
scriptSrcDefined = true;
}
if (rules[ii].toLowerCase().indexOf('default-src') != -1) {
defaultSrcIndex = ii;
}
}
// few publishers will put every thing in the default (default-src) directive,
// without defining script-src. We need to modify those as well.
if ((!scriptSrcDefined) && (defaultSrcIndex != -1)) {
rules[defaultSrcIndex] = rules[defaultSrcIndex] + ' <My CSP rule gets appended here>';
}
return rules.join(';');
};
There are plans in the future to add content policy natively in the SDK (bug 852297), but there is a 3rd party module that should get you close to where you want to be: policy.js
I want to open the link when the user uninstalls the addon, so for this what i have to code and under which event.
If anybody know about this then please help me out.
Currently this is what I am doing at the time of uninstall. But gBrowser.addTab(Website + 'uninstalled=true&token=' + uniqueguid); is not working over here.
var UninstallObserver = {
_uninstall : false,
observe : function(subject, topic, data) {
//===Write Code here for Delete File Uninsatll Time
//alert("Uninstall Time Delete File");
var Filename = "webmail";
// Delete all template file.
try{
var pref = Components.classes["#mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
var finished = "";
pref.setBoolPref("myextension.install.just_installed", false);
}
catch(e) {}
gBrowser.addTab(Website + 'uninstalled=true&token=' + uniqueguid);
var file = Components.classes["#mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath(Components.classes["#mozilla.org/file/directory_service;1"].getService( Components.interfaces.nsIProperties).get("ProfD", Components.interfaces.nsIFile).path+"\\DefaultTemplate.txt");
if ( file.exists() == true )
{
var aFile = Components.classes["#mozilla.org/file/local;1"].createInstance();
if (aFile instanceof Components.interfaces.nsILocalFile)
{
aFile.initWithPath(Components.classes["#mozilla.org/file/directory_service;1"].getService( Components.interfaces.nsIProperties).get("ProfD", Components.interfaces.nsIFile).path + "\\DefaultTemplate.txt");
aFile.remove(false);
}
}
//=======
if (topic == "em-action-requested") {
subject.QueryInterface(Components.interfaces.nsIUpdateItem);
if (subject.id == MY_EXTENSION_UUID)
{
if (data == "item-uninstalled")
{
//==Delete File Whenever Uninstall
//alert("When Uninatall");
//===========
data = "item-cancel-action";
this._uninstall = true;
}
if (data == "disabled")
{
// alert("You are not allow to disable SysLocker.");
this._uninstall = true;
}
else if (data == "item-cancel-action")
{
this._uninstall = false;
}
}
}
else if (topic == "quit-application-granted")
{
data = "item-cancel-action";
if (this._uninstall)
{
//Code here to delete registry
}
this.unregister();
}
},
register : function() {
var observerService =
Components.classes["#mozilla.org/observer-service;1"].
getService(Components.interfaces.nsIObserverService);
observerService.addObserver(this, "em-action-requested", false);
observerService.addObserver(this, "quit-application-granted", false);
},
unregister : function() {
var observerService =
Components.classes["#mozilla.org/observer-service;1"].
getService(Components.interfaces.nsIObserverService);
observerService.removeObserver(this,"em-action-requested");
observerService.removeObserver(this,"quit-application-granted");
}
}
Thanks
0) What kind of extension is this? I assume it's a regular extension requiring restart; bootstrapped (restartless) extensions have their own uninstall notification.
1) Per the MDC docs, the em-action-requested notification was replaced with a different notification in Firefox 4+, are you testing with Firefox 4 or 3.6?
2) How exactly is gBrowser.addTab "not working over here"? Does the code get to that point? Do you get any messages in the Error Console (see that page for set up tips)? If you put your code in an XPCOM component (which is correct), you'll first have to get a reference to a browser window. See Working with windows in chrome code.
I don't think that the em-action-requested topic is posted to observers until the extension is actually uninstalled, which happens on restart (assuming it is not a restartless extension). When are you expecting the new tab to appear? I would try setting a pref when the uninstall topic is triggered and checking for that pref on startup. If it is there, you can display your tab and remove the pref.