Hyperlink-Android/app/src/main/java/dev/garrettmills/starship/hyperlink/LoginTokenScannerActivity.java

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Java
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package dev.garrettmills.starship.hyperlink;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Size;
import android.widget.Toast;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.ExecutionException;
import dev.garrettmills.starship.hyperlink.scanner.QRCodeImageAnalyzer;
import dev.garrettmills.starship.hyperlink.scanner.QRCodeListener;
import dev.garrettmills.starship.hyperlink.util.InvalidLoginTokenException;
import dev.garrettmills.starship.hyperlink.util.LoginToken;
public class LoginTokenScannerActivity extends AppCompatActivity implements QRCodeListener {
private PreviewView previewView;
private ListenableFuture<ProcessCameraProvider> cameraProviderFuture;
private String qrCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_token_scanner);
previewView = findViewById(R.id.activity_login_token_scanner_previewView);
cameraProviderFuture = ProcessCameraProvider.getInstance(this);
requestCamera();
}
protected void requestCamera() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
startCamera();
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, Hyperlink.REQUEST_PERMISSION_CAMERA);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == Hyperlink.REQUEST_PERMISSION_CAMERA) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
startCamera();
} else {
if ( BuildConfig.DEBUG ) {
Toast.makeText(this, "Camera permission denied", Toast.LENGTH_SHORT).show();
}
// If we denied, go back up to the main activity, w/o any login token
finish();
}
}
}
private void startCamera() {
cameraProviderFuture.addListener(() -> {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindCameraPreview(cameraProvider);
} catch (ExecutionException | InterruptedException e) {
if ( BuildConfig.DEBUG ) {
Toast.makeText(this, "Error starting camera: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
finish();
}
}, ContextCompat.getMainExecutor(this));
}
private void bindCameraPreview(@NonNull ProcessCameraProvider cameraProvider) {
previewView.setPreferredImplementationMode(PreviewView.ImplementationMode.SURFACE_VIEW);
Preview preview = new Preview.Builder().build();
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build();
preview.setSurfaceProvider(previewView.createSurfaceProvider());
ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
.setTargetResolution(new Size(1280, 720))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();
imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(this), new QRCodeImageAnalyzer(this));
Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner) this, cameraSelector, imageAnalysis, preview);
}
public void onQRCodeFound(String qrCode) {
if ( !isValidLoginToken(qrCode) ) return;
Intent result = new Intent();
result.putExtra(Hyperlink.EXTRA_LOGIN_TOKEN, qrCode);
setResult(RESULT_OK, result);
finish();
}
public void onQRCodeNotFound() {}
public boolean isValidLoginToken(String token) {
try {
new LoginToken(token);
return true;
} catch (InvalidLoginTokenException e) {
return false;
}
}
}