Implementation of NFC on Android Chrome 81 not working - javascript

Im trying to read NFC tags from chrome 81 on andriod with the following code:
<html>
<head>
<title>NFC</title>
</head>
<body>
<button onclick="reader()">Scan</button>
<script>
function reader(){
const reader = new NDEFReader();
reader.scan().then(() => {
alert("Scan started successfully.");
reader.onerror = () => {
alert("Cannot read data from the NFC tag. Try another one?");
};
reader.onreading = event => {
alert("NDEF message read.");
};
}).catch(error => {
alert(`Error! Scan failed to start: ${error}.`);
});
}
</script>
</body>
the problem im having with it is that it reads the entry from the nfc tag but doesnt give alerts like the code suggests, instead it trys to direct me to installed apps on my phone. However, when i use https://googlechrome.github.io/samples/web-nfc/ that is using the full API it works and displays in the webpage as data. The main difference is that im using the Enabling via chrome://flags method to allow the NFC API.
out of reading the tag, my only aim is to save the content to sessionStorage as a variable to be used by other parts of the website.
Thanks in advance

One difference between https://googlechrome.github.io/samples/web-nfc/ and your code that would matter is the fact this demo used to have an origin trial token in its web page.
For now, to experiment with Web NFC on Android, enable the #experimental-web-platform-features flag in chrome://flags as described in https://web.dev/nfc/#use
Hopefully this flag won't be required once it is shipped to the web platform.

Related

How to find the ID / Program name of a phone app application in web form?

What I am doing
I am creating a web form that is being used as a QR code to open an application installed in an android / IOS phone. When the user scans the QR code the phone shall run the web form and the web form will check if the application is installed inside the phone, if the application is installed, the web form will open the application, if not it will open the google play store/app store web page based on which OS system is being used.
My problem
Right now my problem is that I do not know what is the name/id of the application to trigger/open it, the only thing I about the app know is that it is called Rymtime inside the setting and also the home screen. The application's google play store link is at here and here for the app store.
PS. I do not own/create the application and do not have any access to modify its code.
What I have tried
I have tried to put its name directly into the code:
window.location = "Rymtime://";
I have also tried to put the "id" thingy found inside its google play store website "www...id=com.time2clock.wai.timeemployee"
window.location = "com.time2clock.wai.timeemployee://";
My Code
I created my code based on this stack overflow question.
Below is my code:
<body>
...
<button name="data1" type="button" onclick="getOS()">Click</button> //I use button to test out the function
...
</body>
<script type="text/javascript">
function getOS() {
var userAgent = window.navigator.userAgent,
platform = window.navigator.platform,
windowsPlatforms = ['Win32', 'Win64', 'Windows', 'WinCE'], //as I do not own an Iphone I use this to test out the IOS part
iosPlatforms = ['iPhone', 'iPad', 'iPod'],
os = null;
if (iosPlatforms.indexOf(platform) !== -1) {
ios();
} else if (windowsPlatforms.indexOf(platform) !== -1) {
ios(); //as I do not own an Iphone I use this to test out the IOS part
} else if (/Android/.test(userAgent)) {
android();
}
}
function ios() {
setTimeout(function () { window.location = "https://apps.apple.com/my/app/rymtime/id1447217174"; }, 25);
window.location = "Rymtime://"; //I do not test this part because I do not own an Iphone an I am using window to see if the code is being executed, I only check if the website above is runned
}
function android() {
setTimeout(function () { window.location = "https://play.google.com/store/apps/details?id=com.time2clock.wai.timeemployee"; }, 25);
window.location = "Rymtime://"; //The application is not executed thus it redirect to the play store page.
}
</script>
Btw is the location of an application installed inside a phone the same as the others? Like this:
somefile\somefile\packageName
Or something like this:
Username(differ)\somefile\somefile\packageName
Thanks.
I am not sure what it is for IOS but I found out that I can just add &launch=true at the end of the URL of the application's google play store page to launch the app if it is installed.

How do you obtain permissions from web-nfc API?

I'm trying to get Web NFC to work through the Web NFC API, but I can't get it past an error message of NotAllowedError: NFC permission request denied.
I'm using this on Chrome 89 Dev on a Windows 10 computer, and the source code is being run locally.
I have tried the examples posted on the Internet also, including the Google sample but it returns the same error. I'm not concerned with it being experimental at this point as referring to this does show it has successfully passed the necessary tests, including permissions.
The HTML/JS code I'm using is below, and I've read the specification point 9.3, but I can't make sense of it to write it as code, so is there a guideline algorithm that would be helpful here to resolve this?
async function readTag() {
if ("NDEFReader" in window) {
const reader = new NDEFReader();
try {
await reader.scan();
reader.onreading = event => {
const decoder = new TextDecoder();
for (const record of event.message.records) {
consoleLog("Record type: " + record.recordType);
consoleLog("MIME type: " + record.mediaType);
consoleLog("=== data ===\n" + decoder.decode(record.data));
}
}
} catch(error) {
consoleLog(error);
}
} else {
consoleLog("Web NFC is not supported.");
}
}
async function writeTag() {
if ("NDEFWriter" in window) {
const writer = new NDEFWriter();
try {
await writer.write("helloworld");
consoleLog("NDEF message written!");
} catch(error) {
consoleLog(error);
}
} else {
consoleLog("Web NFC is not supported.");
}
}
function consoleLog(data) {
var logElement = document.getElementById('log');
logElement.innerHTML += data + '\n';
};
<!DOCTYPE html>
<html>
<head>
<script src="webnfc.js"></script>
</head>
<body>
<p>
<button onclick="readTag()">Test NFC Read</button>
<button onclick="writeTag()">Test NFC Write</button>
</p>
<pre id="log"></pre>
</body>
</html>
From https://web.dev/nfc/#security-and-permissions
Web NFC is only available to top-level frames and secure browsing contexts (HTTPS only). Origins must first request the "nfc" permission while handling a user gesture (e.g a button click). The NDEFReader scan() and write() methods trigger a user prompt, if access was not previously granted.
I guess you are running from a file:// URL as you said "locally" which is not supported.
You need to host it from a local web server using a https:// URL
Once in the right scope trying to scan or write should trigger a user prompt.
You can also check permissions see https://web.dev/nfc/#check-for-permission
Update:
So I tried the sample page https://googlechrome.github.io/samples/web-nfc/
And this works for me on Android Chrome 87 with "Experimental Web Platform features" enabled
When you hit the scan button A dialog asking for permission pops up.
Comparing the code in this sample to yours I notice that does:-
ndef.addEventListener("reading" , ({ message, serialNumber }) => { ...
Where as yours does:-
ndef.onreading = event => { ...
I don't know if it is the style setting what happens on the Event or something else (Hey this is all experimental)
Update2
To answer the question from the comments of Desktop support.
So you should be some of the desktop/browser combinations at the moment and may be in the future there will be wider support as this is no longer experimental standards. Obviously as your test link suggest Chrome on a Linux Desktop should work as this is really similar to Android Support, with all the NFC device handling done by libnfc and the browser just has to know about this library instead of every type usb or other device than can do NFC.
From what seen of NFC support on Windows, most of this is focussed on direct controlling the NFC reader via USB as just another USB device, while there is a libnfc equivalent in Windows.Networking.Proximity API's I've not come across any NFC reader saying they support this or anybody using it.
For Mac Deskstop, given that Apple are behind the curve with NFC support in iOS, I feel their desktop support will be even further behind even though it could be similar to Linux.
As you can read at https://web.dev/nfc/#browser-support, Web NFC only supports Android for now which is why you get "NotAllowedError: NFC permission request denied." error on Windows.

Uploading a file using an HtmlService form in Google Apps always causes "server error" and a stack trace

I am trying to make a script for my Google spreadsheet in which I upload an XML file and process its data. I am able to create a form, display it in a modal dialog, but I get a strange error when I attempt to submit a form with a file: Nothing is logged for the error in Stackdriver Error Reporting. However, the web browser console logs the following error message:
Error: We're sorry, a server error occurred. Please wait a bit and try again.
The error message comes with a stack trace:
Zd https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:56
bf https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:71
G https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:15
J https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:99
Id https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:47
Ed https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:48
b https://n-z7hx4jjtvixobmaqkddve7tkcdyndjsnh3plmfq-0lu-script.googleusercontent.com/static/macros/client/js/2745927008-mae_html_user_bin_i18n_mae_html_user__en_gb.js:44
Of course, the stack trace doesn't help here, as it points to a huge minified JavaScript file on Google's servers.
I have tried replicating the examples in the current Google Apps documentation as well as a few old and recent examples I could find on StackOverflow, and the issue is always the same: When comes the time to submit the form data, the script crashes.
I know that this is specifically caused by the file input field. If I remove it, I'm able to submit the form and process its data. If I add the file input field, I get the error as soon as I submit the form.
I can tell the issue is not the file. I have tried uploading a big (125 kb) text file at first, followed by one a few bytes in size, and even not submitting any file at all, and I get the same error. I'm encountering this issue on both Chrome and Firefox, on two separate Google accounts.
Here is my Google script. The updateTracker method is called when clicking on a drawing object that I placed in the spreadhseet.
function updateTracker()
{
var thisUI = SpreadsheetApp.getUi();
var htmlUpdatePage = HtmlService.createHtmlOutputFromFile('myPage');
var updatePrompt = thisUI.showModalDialog(htmlUpdatePage, 'Update');
}
function digestXml(theForm) {
//var fileBlob = theForm.xmlFile;
var thisUI = SpreadsheetApp.getUi();
thisUI.alert("Test");
}
Here is my HTML file, "myPage":
<!DOCTYPE html>
<html>
<head>
<base target="_top">
<script>
// Prevent forms from submitting.
function preventFormSubmit() {
var forms = document.querySelectorAll('form');
for (var i = 0; i < forms.length; i++) {
forms[i].addEventListener('submit', function(event) {
event.preventDefault();
});
}
}
window.addEventListener('load', preventFormSubmit);
function submitXml(objForm)
{
google.script.run.withSuccessHandler(updateUrl).digestXml(objForm);
}
function updateUrl(url) {
var div = document.getElementById('output');
div.innerHTML = 'Got it!';
}
</script>
</head>
<body>
<form id="xmlForm" onsubmit="submitXml(this)">
<input type="file" value="Browse" name="xmlFile" />
<input type="submit" value="Digest" />
</form>
<div id="output"></div>
</body>
</html>
I can tell that the issue occurs precisely when trying to pass objForm from the HTML to the Google Script. I'm able to write to the console right before the line google.script.run.withSuccessHandler(updateUrl).digestXml(objForm); in HTML, but I don't get to thisUI.alert("Test"); in the Google Script. If I remove the parameter objForm from digestXml() in the HTML, the crash does not occur.
It appears that the issue only occurs in a recently released version of Google App's scripting interface, "V8".
When I create a script, I am prompted to use this version of their scripting interface. Trusting Google to test their functionalities, I accepted without thinking.
If I edit my script's configuration file to use STABLE instead of V8, I do not encounter the issue. If you're having this issue, here's how to do that:
Open the Script Editor.
In the top menu, select View > Show manifest file.
In the files list, open appsscript.json.
Replace "runtimeVersion": "V8" with "runtimeVersion": "STABLE"
Save.
This is however alarming as I presume the current stable version will be deprecated eventually in favor of V8. I logged an issue for this: https://issuetracker.google.com/issues/149980602

Deep linking opening both installed app on the android and playstore url

I am trying to acheive deeplinking through below javascrip piece of code, but the issue is if I have an installed app on android device it is opening both application and playstore url at sametime.Any suggestions to this?
<html>
<body>
<button onclick="launchAndroidApp()">Deep linking test</button>
<script>
function launchAndroidApp() {
var test = window.open('DeeplinkingURL', "_self");
setTimeout("window.location = 'Playstoreurl", 1000);
}
</script>
</body>
</html>
You can use a single URL using Android Intents with Chrome. For example, supposing DeeplinkingUrl="https://example.com/hello" and you expect it to be opened by the com.example.Hello application,
intent://example.com/hello
#Intent;
scheme=https;
package=com.example.Hello;
S.browser_fallback_url=market%3A%2F%2Fdetails%3Fid%3Dcom.example.Hello;
end
without the spaces, will use com.example.Hello to launch https://example.com/hello if available, and open the Play store listing for the app otherwise. (Of course you could use http://play.google.com/store/apps/details?id= instead of market://details?id=.)
The setTimeout method simply gets executed regardless after 1 second. This is not the right approach to doing so, but if you are convinced on this method, I'd try using a try-catch.
try{
window.open('DeeplinkingURL', "_self");
} catch {
window.location = 'Playstoreurl';
}
Instead, I'd recommend using Branch. You can do this with their SDK for free and much cleaner.

Adobe DPS Android Entitlement

We are stuck with an Adobe DPS project. We cant get our DPS android app to do Entitlement for our print subscribers and we were wondering if anyone out there has managed to get this right.
We've used Adobe's tutorial here:
http://www.adobe.com/devnet/digitalpublishingsuite/articles/library-store-combined-template.html, with isEntitlementViewer set to true.
The code asks for a username and password and then via Adobe's API AdobeLibraryAPI.js, it authenticates a user via our own API. the very same code is working 100% in the iPad version of the app.
The file that actually processes the login (called LoginDialog.js) contains the following code within a function called clickHandler (we’ve added a few javascript alerts to try debug the login process)
// Login using the authenticationService.
var transaction = adobeDPS.authenticationService.login($username.val(), $password.val());
alert("1: "+transaction.state ); //returns “1: 0”
transaction.completedSignal.addOnce(function(transaction) {
alert("2: "+transaction.state ); //never returns
var transactionStates = adobeDPS.transactionManager.transactionStates;
if (transaction.state == transactionStates.FAILED) {
$("#login .error").html("Authentication Failed.")
} else if (transaction.state == transactionStates.FINISHED){
this.$el.trigger("loginSuccess");
this.close();
}
alert("3: "+transaction.state ); //never returns
}, this);
alert("4: "+transaction.error ); //never returns
Anyone out there with some DPS/android/Entitlement experience?
Android Entitlement only works after an integrator ID is registered with Adobe, as the android viewers service routes are only configured via the integrator ID.
If you do not have an integrator ID, you need to acquire one from Adobe Support.
Also it is worth mentioning, that in contrary to iOS, Android DPS viewers only support one base Route/URL for Authentication and Entitlements.
For Example whereas in iOS you can have the login been done via the first URL:
https://example.com/api/v1/SignInWithCredentials
The second URL for entitlements can be on a different URL:
http://server2.example.com/v1/api/entitlements
In android both URLs have to be the same, e.g.:
https://example.com/api/v1/SignInWithCredentials and
https://example.com/api/v1/entitlements

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