# Lab9

## Lab9-1 : Add authentication to the App
1. Run this command from the root of your app directory
* **Replace the name for the project into CP[student ID]**

amplify init


2. Run this command from the root of your app directory

amplify add auth


3. Run this command from the root of your app directory

amplify push


4. Add the following imports to the top of the **app/java/com.cloudprog.example/ui/AuthenticatorActivity.java**

import android.app.Activity;
import android.content.Intent;
import android.widget.Toast;

import com.amazonaws.mobile.auth.core.IdentityManager;
import com.amazonaws.mobile.auth.core.DefaultSignInResultHandler;
import com.amazonaws.mobile.auth.core.IdentityProvider;
import com.amazonaws.mobile.auth.ui.AuthUIConfiguration;
import com.amazonaws.mobile.auth.ui.SignInActivity;
import com.example.cloudprog.viewmodels.Injection;

5. Edit the **onCreate()** method of **app/java/com.cloudprog.example/ui/AuthenticatorActivity.java** as follows:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_authenticator);
        //Todo : Handle cognito signin
        Injection.initialize(getApplicationContext());

        final IdentityManager identityManager = Injection.getAWSService().getIdentityManager();
        // Set up the callbacks to handle the authentication response
        identityManager.login(this, new DefaultSignInResultHandler() {
            @Override
            public void onSuccess(Activity activity, IdentityProvider identityProvider) {
                Toast.makeText(AuthenticatorActivity.this,
                        String.format("Logged in as %s", identityManager.getCachedUserID()),
                        Toast.LENGTH_LONG).show();
                // Go to the main activity
                final Intent intent = new Intent(activity, MainActivity.class)
                        .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                activity.startActivity(intent);
                activity.finish();
            }

            @Override
            public boolean onCancel(Activity activity) {
                return false;
            }
        });

        // Start the authentication UI
        AuthUIConfiguration config = new AuthUIConfiguration.Builder()
                .userPools(true)
                .build();
        SignInActivity.startSignInActivity(this, config);
        AuthenticatorActivity.this.finish();
    }

6. Compile and Run app on Emulator


7. Create a new account and Confirm your account


8. Done! Show TA the validation results of Step 6 and 7

## Lab9-2 Create a S3 bucket

1. Add the following imports to the top of the **app/java/com.cloudprog.example/ui/MainActivity.java**

//lab9-2 import
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.AccessControlList;
import com.amazonaws.services.s3.model.CannedAccessControlList;
import com.amazonaws.services.s3.model.CreateBucketRequest;
import com.amazonaws.services.s3.model.GroupGrantee;
import com.amazonaws.services.s3.model.Permission;
import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.regions.Regions;
import android.os.StrictMode;

2. Replace "studentID" with your student ID in **app/res/values/strings.xml**

3. Get Identity pool AWS Credentials
* AWS Console > Cognito > Federated Identities > Choose the pool of your app > Sample code in menu bar
* Copy the **Identitiy pool ID**


4. Add the Credentials and the code below to top of **onCreate()** of **app/java/com.cloudprog.example/ui/MainActivity.java**
* Remember use your **Identitiy pool ID**.

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //network policy
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        // Initialize the Amazon Cognito credentials provider
        CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
                getApplicationContext(),
                "", // Use your Identity pool ID
                Regions.US_EAST_1 // Region
        );
        // Initialize s3Client
        final AmazonS3Client s3Client = new AmazonS3Client(credentialsProvider.getCredentials());

5. Add the code below to **button2.setOnClickListener()**
* Use **alt+enter** to import Toast automatically.
* If you encounter the error: "**InvalidBucketAclWithObjectOwnership**", replace "s3Client.createBucket(**createBucketRequest**);" into "s3Client.createBucket(**getString(R.string.bucket_name)**);"

button2.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            //Todo : create a s3 bucket & add permission
            try{
                //Check bucket name in app/res/values/string.xml
                AccessControlList acl = new AccessControlList();
                acl.grantPermission(GroupGrantee.AllUsers, Permission.FullControl);
                CreateBucketRequest createBucketRequest = new CreateBucketRequest(getString(R.string.bucket_name))
                            .withAccessControlList(acl).withCannedAcl(CannedAccessControlList.PublicReadWrite);
                s3Client.createBucket(createBucketRequest);
                Toast.makeText(MainActivity.this, "Create success", Toast.LENGTH_LONG).show();
            }catch(Exception e){
                e.printStackTrace();
                Toast.makeText(MainActivity.this, "Create fail", Toast.LENGTH_LONG).show();
            }
        }
    });

6. Add **S3FullAccess** policy to **amplify-CP[student ID]-env-XXXXXXX-authRole**

7. Done! Compile, Run, Click button and Check the bucket you created in S3.

## Lab9-3 : Upload a Object to S3
Note :
* Make sure you have finished lab9-1 and 9-2, or you may get some error in lab9-3.
* If camera on virtual device doesn't work, just close the camera and reopen it.

1. Add the following imports to the top of the **app/java/ui/CameraActivity.java**

import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3Client;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

2. Add the Credentials and the code below to top of **onCreate()** of **app/java/com.cloudprog.example/ui/CameraActivity.java**
* Use **alt+enter** to import StrictMode automatically.
* Use your **Identitiy pool ID**.

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera);
        this.imageView = (ImageView)this.findViewById(R.id.image_view);
        
        //network policy
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        //CredentialsProvider initialization
        CognitoCachingCredentialsProvider credentialsProvider;
        credentialsProvider = new CognitoCachingCredentialsProvider(
                getApplicationContext(),
                "", // Use your Identity Pool ID
                Regions.US_EAST_1 // Region
        );

        //s3client initialization
        final AmazonS3Client s3Client = new AmazonS3Client(credentialsProvider.getCredentials());

3.Add the code below to **uploadbutton.setOnClickListener()**

uploadButton.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        //Todo : Upload a picture to S3
        //create a file to write bitmap data
        File f = new File(getCacheDir(), "test1.jpg");
        try {
            f.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }

        //Convert bitmap to byte array
        Bitmap bitmap = upload_image;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
        byte[] bitmapdata = bos.toByteArray();

        //write the bytes in file && send image to s3-bucket
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(f);
            fos.write(bitmapdata);
            fos.flush();
            fos.close();
            s3Client.putObject(getString(R.string.bucket_name), "upload_image.jpg", f);
            Toast.makeText(CameraActivity.this, "Upload success", Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(CameraActivity.this, "Upload fail", Toast.LENGTH_LONG).show();
        }
    }
});

4. Done! Take a picture and upload to S3
* Open camera

* Upload Image

<!-- ## Lab9-4 Third party login
1. Follow the Lab9 slides to setup cognito and FB application

2. Add application ID and protocol_scheme in res/values/strings
protocol shceme is fb+app_id

<resources>
    <string name="app_name">CloudProg</string>
    <string name="bucket_name">cloudprog-hw3-studentID</string>
    <string name="queue_name">cloudprog-hw3</string>
    <string name="facebook_app_id">280920040359127</string>
    <string name="fb_login_protocol_scheme">fb280920040359127</string>
</resources>

3. Add fb activities to AndroidManifest.xml

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id" />
        <activity android:name=".ui.AuthenticatorActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.facebook.FacebookActivity"
            android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name" />
        <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
        </activity>
        <activity android:name=".ui.CameraActivity" />
        <activity android:name=".ui.MainActivity">

        </activity>
    </application>

4. Add dependencies to build.gradle

// FB
    implementation 'com.facebook.android:facebook-login:[5,6)'
    implementation 'com.amazonaws:aws-android-sdk-auth-facebook:2.15.+@aar'

5. Change codes in AuthenticatorActivity.java

package com.example.cloudprog.ui;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

import com.amazonaws.mobile.config.AWSConfiguration;
import com.example.cloudprog.R;

import android.app.Activity;
import android.content.Intent;
import android.widget.Toast;
import com.facebook.AccessToken;
import com.amazonaws.mobile.auth.facebook.FacebookButton;
import com.amazonaws.mobile.auth.facebook.FacebookSignInProvider;

import com.amazonaws.mobile.auth.core.IdentityManager;
import com.amazonaws.mobile.auth.core.DefaultSignInResultHandler;
import com.amazonaws.mobile.auth.core.IdentityProvider;
import com.amazonaws.mobile.auth.ui.AuthUIConfiguration;
import com.amazonaws.mobile.auth.ui.SignInActivity;
import com.example.cloudprog.viewmodels.Injection;

import java.util.HashMap;
import java.util.Map;


public class AuthenticatorActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Todo : Handle cognito signin

        Injection.initialize(getApplicationContext());

        initializeApplication();
        final IdentityManager identityAWSManager = Injection.getAWSService().getIdentityManager();
        final IdentityManager identityFBManager = IdentityManager.getDefaultIdentityManager();


//        FacebookSdk.sdkInitialize(getApplicationContext());
//        AppEventsLogger.activateApp(this);
        // AWS: Set up the callbacks to handle the authentication response
        identityAWSManager.login(this, new DefaultSignInResultHandler() {
                    @Override
                    public void onSuccess(Activity activity, IdentityProvider identityProvider) {
                        Toast.makeText(AuthenticatorActivity.this,
                                String.format("Logged in as %s", identityAWSManager.getCachedUserID()),
                                Toast.LENGTH_LONG).show();
                        // Go to the function activity
                        final Intent intent = new Intent(activity, MainActivity.class) //MainActivity
                                .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        activity.startActivity(intent);
                        activity.finish();
                    }

                    @Override
                    public boolean onCancel(Activity activity) {
                        return false;
                    }
                }
        );

        // FB: Set up the callbacks to handle the authentication response
        identityFBManager.login(this, new DefaultSignInResultHandler() {
                    @Override
                    public void onSuccess(Activity activity, IdentityProvider identityProvider) {
                        Map<String, String> logins = new HashMap<String, String>();
                        logins.put("graph.facebook.com", AccessToken.getCurrentAccessToken().getToken());
                        AccessToken accessToken = AccessToken.getCurrentAccessToken();
                        boolean isLoggedIn = accessToken != null && !accessToken.isExpired();

                        Toast.makeText(AuthenticatorActivity.this,
                                String.format("Signed in with %s",
                                        identityProvider.getDisplayName()), Toast.LENGTH_LONG).show();
                        // Go to the function activity
                        final Intent intent = new Intent(activity, MainActivity.class)
                                .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        activity.startActivity(intent);
                        activity.finish();
                    }

                    @Override
                    public boolean onCancel(Activity activity) {
                        return false;
                    }
                }
        );

        // Start the authentication UI
        AuthUIConfiguration config = new AuthUIConfiguration.Builder()
                .userPools(true)
                .signInButton(FacebookButton.class) // Show Facebook button
                .build();
        SignInActivity.startSignInActivity(this, config);
        AuthenticatorActivity.this.finish();
    }


    private void initializeApplication() {
        AWSConfiguration awsConfiguration = new AWSConfiguration(getApplicationContext());

        // If IdentityManager is not created, create it
        if(IdentityManager.getDefaultIdentityManager() == null){
            IdentityManager identityFBManager =
                    new IdentityManager(getApplicationContext(),awsConfiguration);
            IdentityManager.setDefaultIdentityManager(identityFBManager);
        }

        // Add Facebook as Identity Provider
        IdentityManager.getDefaultIdentityManager().addSignInProvider(
                FacebookSignInProvider.class);

        FacebookSignInProvider.setPermissions("public_profile");

    }
}

7. Build and run
 -->