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services:
  https-portal:
    image: steveltn/https-portal:1
    ports:
      - 80:80
      - 443:443
    restart: always
    networks:
      - front-tier
    environment:

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Imports

    const session =  require("express-session");
    const Keycloak =  require("keycloak-connect");    
    const express =  require("express");    
    const app =  express(); 

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Dependancies build.gradle(Module: app)

implementation ('org.jboss.aerogear:aerogear-android-authz:2.0.0') {  
        exclude module : 'compatibility-v4'  
        transitive = true  
    }

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OAuth2 Guide for Node Rest APIs and Android clients using KeyCloak Identity Server

What is KeyCloak ?

Keycloak is an open source Identity and Access Management solution aimed at modern applications and services. It makes it easy to secure applications and services with little to no code. It's open source and free to use

When to use KeyCloak ?

• When you don't know how to implement complex role based user authentication/ authorization mechanism to your app.
• Accelerated development time? maybe you'll have great business logic to focus on.

Few steps to complete !

1. Setup and deploy KeyCloak Server. ( In 5 Mins ?😎😎 )
2. Setup Realms and Clients.

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private static final String CHANNEL_ID = "com.apps.testnotifications" ;

private void createNotificationChannel() {
     
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        CharSequence name = getString(R.string.app_name);
        String description = getString(R.string.app_name);
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
        channel.setDescription(description);

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import android.os.Environment;
import org.junit.Test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

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import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;


try {
    String privateKeyContent = sharedPreferences.getString("SAMPLE_KEY_PRI",null); // load private key here

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data class Repo(
    val `private`: Boolean,
    val archive_url: String,
    val archived: Boolean,
    val assignees_url: String,
    val blobs_url: String,
    val branches_url: String,
    val clone_url: String,
    val collaborators_url: String,
    val comments_url: String,

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var app = angular.module('app',[]);

app.controller('homeCtrl', function($scope){
var DWObject;
$scope.initiate = function () {
    Dynamsoft.WebTwainEnv.Load();
}    

$scope.AcquireImage = function(){ 
    Dynamsoft.WebTwainEnv.RegisterEvent('OnWebTwainReady', $scope.Dynamsoft_OnReady());