Develop Reference

How can I get any unique id flutter android and ios

I need to get a unique information of my device. This may be the mac address, it may be the imei address, or something different, ios and android return a constant value after a certain version and do not give the unique id.
The unique id as currently used changes when the application is deleted and reinstalled. I have a chat system and I don't want some members to come back.
Is there a way to access a device's unique information by obtaining a permission if necessary?

you can use a package called firebase_messaging and get device token
String deviceToken = await FirebaseMessaging.instance.getToken();
To get the IMEI of user phone device_information
String imeiNo = await DeviceInformation.deviceIMEINumber;

The token is generated per the client app instance.
On initial startup of your app, the FCM SDK generates a registration token for the client app instance.
See Best practices for FCM registration token management for details.
Only one user at the time is logged in on the app instance. Delete the token when a user logs out and then you get a new token when a new user logs in.

How can i authenticate to my Identity/User Pool with Cognito Identity?

I have been trying to solve this for a few days now but i can't figure out what the problem is.
I have a user pool and an identity pool on AWS Cognito. I have run the sample code and used it to log in and register users with Facebook and Google+ successfully. After login i am able to authenticate using the token to use SNS or the Sync services.
I have registered a user and got a token (after logging in) with Cognito Identity. However the next step is to use the token to authenticate into the identity pool. This is where i keep getting the error
I have followed the instructions from Integrating User Pools with Amazon Cognito Identity and I get a token which I then try to pass it along with the pool id to the credentials provider.
credentialsProvider.clear();
credentialsProvider.withLogins(loginMap).refresh();
My code fails on refresh(). At this point credentialsProvider is a AWSBasicCognitoIdentityProvider and refresh() fails in the super.refresh() which calls getIdentityId() in the abstract parent class AWSAbstractCognitoIdentityProvider
#Override
public String getIdentityId() {
if (identityId == null) {
GetIdRequest getIdRequest = new GetIdRequest()
.withAccountId(getAccountId())
.withIdentityPoolId(getIdentityPoolId())
.withLogins(loginsMap);
appendUserAgent(getIdRequest, getUserAgent());
GetIdResult getIdResult = cib.getId(getIdRequest);
No matter what values i put in the loginsMap, i get the error
Invalid login token. Issuer doesn't match providerName
at cid.getid(getIdRequest).
Most of the code is available to download free if you create an app in the Mobile Hub and generate the code. You can then configure authentication providers - FB, Google , etc.
What am I doing wrong ?
Thanks.
Edit : Here are examples of what i have tried
The token is always the object in the map. Below are the different keys
"cognito-identity.amazonaws.com"
the User Pool id - us-east-1_xxxxxxxxx
the User Pool ARN - cognito-idp:us-east-1:xxxxxxxxxxxx:userpool/us-east-1_xxxxxxxxx

OK i found the answer - I was putting in the wrong key value in the loginMap.
it should be
cognito-idp.<region>.amazonaws.com/<YOUR_USER_POOL_ID>
as it says in the documentation linked in the question
I don't know how I didn't see that.

FB API request without user login

I want to get the events list from a public Facebook page, and to do it I need an access token. This is not a problem when doing it server-side, because I can use both my secret and client app id in order to get an access token, but this is not possible on client-side (for example, on an iOS application), since it would make clear my app secret ID. What can I do? With the Facebook SDK for iOS, I think I can only get an access token making the user log-in, but, in my case, this is not necessary, since I only need to get a public list of events.
With PHP:
require '../facebook-php-sdk/facebook.php'; //MY FACEBOOK SDK
$facebook = new Facebook(array(
'appId' => '<#MYAPPID#>',
'secret' => '<#MYAPPSECRET#>', //<-- I CAN'T USE THIS ON CLIENT-SIDE!
));
Thanks

Android Facebook app integration with GAE

I'm thinking about how to solve the next problem:
An Android App which I want to connect to facebook, and to a Server backend(Srv).
Server backend(Srv) which I want to connect to facebook.
The server will run a task that will Get all the Friends of the user(on fb), and the user Statuses(on Fb), and store them on it.
Base assumptions:
I use android as a Mobile device
Server is GAE
Entity key in GAE is the user’s FB-id
User Entity contains:
User fb_id
User verified list(FB_ID String)=> friends of the user that have the app) // maybe use HT?
User statuses list(Status text, date, url)=> whatever I can get from a Status of a user in facebook..
Main questions:
Is the Data representation thought out? can it be better?
How do I handle a situation where two users which are connected to one another add the app at the same time- how can I avoid overlapping?
Should the device Authenticate itself, also with the GAE server?
How to Authenticate GAE with FB
Algorithm:
Android side:
User login and get access token from FB
Posting to my server(Srv) FB Token & myUserFBId // Should I use REST protocol or HTTP
POST?
Server side:
A Servlet handles the POST
{
Query FB ->for the user's friends ids(into friendList = arrayList<FBItem))
foreach FBItem item in friendList
{
//check which FB-ids are in my DB
friendEntity = getKey(item.fb_id)
if(friendEntity != null)
{
// friend exists
verifiedFriendsList.add(item.fb_id) //verifiedFriendsList is ArrayList<String>
friendEntity.getVerifiedFriendList().add(myUserFBId)
}
}
Query FB ->for the user's statuses(into statuses = arrayList<StatusItem))
add new FBEntity(myUserFBId, verifiedFriendsList, statuses) to DB }
Thanks

I have not done anything like this but I think you will need to
Ask user to authenticate your application to use FB- Read about OAuth Api of Facebook
Once your app is authenticated with sufficient permissions you can get users data as per your requirements .
Once you get the data you can process it.
Oauth on FB is what you are searching for..

I'll give you my 4 cents:
The questions that should lead you in developing the DS are: (A) On the
server side, How does the data persist? to a File? to a Database? (B) How much of that data is required to perform the calculations you want done, and how do plan to access it (for example, for an O(n) run, I wouldn't use a HashTable) (C) How does the persist / de-persist work? with an ORM? custom queries?
About concurrency, you'll have to explain what's bugging you. People sign in to SO simultaneously all the time.
3/4. Not an android developer, can't help.

Using authToken for Google Health Data

We have developed and published an app for Google Health. Now we want to avoid every time logging into the gmail account by asking username and password.
So as to do this i have heard that I can have following options.
1. OAuth
2. Account Manager
3.
The problem with OAuth is that it will go via Android -> Web App -> Health path so i will need to develop an web app as well which we dont wish to do it right now.
So I am trying to use Account Manager, here is my code with which I could get list of accounts and an valid authToken for the selected account.
AccountManager mgr = AccountManager.get(getApplicationContext());
System.out.println("Got account manager");
Account[] accts = mgr.getAccounts();
}
Account acct = accts[0];
AccountManagerFuture<Bundle> accountManagerFuture = mgr.getAuthToken(acct, "android", null, this, null, null);
Bundle authTokenBundle = accountManagerFuture.getResult();
System.out.println("Account name "+accts[0].name);
String authToken = authTokenBundle.get(AccountManager.KEY_AUTHTOKEN).toString();
System.out.println("Got token:"+authToken);
But now I am confused about how to use this token to access the health data.
For getting the demographic feed we used the following code,where we explicitly made user to login into our application.
String queryURL = "https://www.google.com/health/feeds/profile/ui/" + profileId +"/-/DEMOGRAPHICS";
getDemoGrInfoQuery = new Query(new URL(queryURL));
Feed dempGrResultFeed;
globals = new Globals();
dempGrResultFeed = healthService.query(getDemoGrInfoQuery, Feed.class);
And thus we used to get the Feed using the URL.
And now I want to skip the login process and use the above authToken for retrieving the feed. How can this be done?
Any help would be really appreciated!!!
Thanks in advance,

As the standard OAuth procedure is supposed to work, you open the OAuth URL in a WebView (or anything similar) with all the required parameters, users provide Google (not your app) with their user name and password, then google gives you a token which you can use for your future communications.
This way the user doesn't have to give you their login credentials. They give it only to google, and google gives you a token which will authenticate your app every time you use it.
I think you should be good to go with this, since it requires you to open a WebView only once, unless the user logs out of google using your application or denies access to your application.
After getting the token, you just start polling google with that token and never ask user for their login credentials. quite seamless.
UPDATE
After our conversation in chat, let me tell you that you'll have to register an application with google, which will give you an appID, this appID will be used by your Android app to tell google that it is requesting permission on behalf of the Application which this appID refers to.
UPDATE 2
open the Google OAUth with all the parameters, google will give you a code
use that code and create a POST request again to google, and google will now return a long lasting AccessToken
You can then use this AccessToken in all your future communications