anotherim/src/main/java/eu/siacs/conversations/ui/UriHandlerActivity.java

package eu.siacs.conversations.ui;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v13.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.widget.Toast;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.persistance.DatabaseBackend;
import eu.siacs.conversations.utils.XmppUri;
import rocks.xmpp.addr.Jid;

public class UriHandlerActivity extends AppCompatActivity {

	public static final String ACTION_SCAN_QR_CODE = "scan_qr_code";
	private static final int REQUEST_SCAN_QR_CODE = 0x1234;
	private static final int REQUEST_CAMERA_PERMISSIONS_TO_SCAN = 0x6789;

	private boolean handled = false;

	public static void scan(Activity activity) {
		if (ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
			Intent intent = new Intent(activity, UriHandlerActivity.class);
			intent.setAction(UriHandlerActivity.ACTION_SCAN_QR_CODE);
			intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
			activity.startActivity(intent);
		} else {
			ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSIONS_TO_SCAN);
		}
	}

	public static void onRequestPermissionResult(Activity activity, int requestCode, int[] grantResults) {
		if (requestCode != REQUEST_CAMERA_PERMISSIONS_TO_SCAN) {
			return;
		}
		if (grantResults.length > 0) {
			if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
				scan(activity);
			} else {
				Toast.makeText(activity, R.string.qr_code_scanner_needs_access_to_camera, Toast.LENGTH_SHORT).show();
			}
		}
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.handled = savedInstanceState != null && savedInstanceState.getBoolean("handled", false);
		getLayoutInflater().inflate(R.layout.toolbar, findViewById(android.R.id.content));
		setSupportActionBar(findViewById(R.id.toolbar));
	}

	@Override
	public void onStart() {
		super.onStart();
		handleIntent(getIntent());
	}

	@Override
	public void onSaveInstanceState(Bundle savedInstanceState) {
		savedInstanceState.putBoolean("handled", this.handled);
		super.onSaveInstanceState(savedInstanceState);
	}

	@Override
	public void onNewIntent(Intent intent) {
		handleIntent(intent);
	}

	private void handleUri(Uri uri) {
		handleUri(uri, false);
	}

	private void handleUri(Uri uri, final boolean scanned) {
		final Intent intent;
		final XmppUri xmppUri = new XmppUri(uri);
		final List<Jid> accounts = DatabaseBackend.getInstance(this).getAccountJids(); //TODO only look at enabled accounts

		if (!xmppUri.isJidValid()) {
			Toast.makeText(this, R.string.invalid_jid, Toast.LENGTH_SHORT).show();
			return;
		}

		if (accounts.size() == 0 && Config.MAGIC_CREATE_DOMAIN != null) {
			intent = new Intent(getApplicationContext(), WelcomeActivity.class);
			WelcomeActivity.addInviteUri(intent, xmppUri);
			startActivity(intent);
			return;
		}

		if (xmppUri.isAction(XmppUri.ACTION_MESSAGE)) {
			final Jid jid = xmppUri.getJid();
			final String body = xmppUri.getBody();

			if (jid != null) {
				intent = new Intent(getApplicationContext(), ShareViaAccountActivity.class);
				intent.putExtra(ShareViaAccountActivity.EXTRA_CONTACT, jid.toString());
				intent.putExtra(ShareViaAccountActivity.EXTRA_BODY, body);
			} else {
				intent = new Intent(getApplicationContext(), ShareWithActivity.class);
				intent.setAction(Intent.ACTION_SEND);
				intent.setType("text/plain");
				intent.putExtra(Intent.EXTRA_TEXT, body);
			}
		} else if (accounts.contains(xmppUri.getJid())) {
			intent = new Intent(getApplicationContext(), EditAccountActivity.class);
			intent.setAction(Intent.ACTION_VIEW);
			intent.putExtra("jid", xmppUri.getJid().asBareJid().toString());
			intent.setData(uri);
			intent.putExtra("scanned", scanned);
		} else {
			intent = new Intent(getApplicationContext(), StartConversationActivity.class);
			intent.setAction(Intent.ACTION_VIEW);
			intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
			intent.putExtra("scanned", scanned);
			intent.setData(uri);
		}

		startActivity(intent);
	}

	private void handleIntent(Intent data) {
		if (handled) {
			return;
		}
		if (data == null || data.getAction() == null) {
			finish();
			return;
		}

		handled = true;

		switch (data.getAction()) {
			case Intent.ACTION_VIEW:
			case Intent.ACTION_SENDTO:
				handleUri(data.getData());
				break;
			case ACTION_SCAN_QR_CODE:
				Intent intent = new Intent(this, ScanActivity.class);
				startActivityForResult(intent, REQUEST_SCAN_QR_CODE);
				return;
		}

		finish();
	}

	private static final Pattern VCARD_XMPP_PATTERN = Pattern.compile("\nIMPP([^:]*):(xmpp:.+)\n");

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent intent) {
		super.onActivityResult(requestCode, requestCode, intent);
		if (requestCode == REQUEST_SCAN_QR_CODE && resultCode == RESULT_OK) {
			String result = intent.getStringExtra(ScanActivity.INTENT_EXTRA_RESULT);
			if (result != null) {
				if (result.startsWith("BEGIN:VCARD\n")) {
					Matcher matcher = VCARD_XMPP_PATTERN.matcher(result);
					if (matcher.find()) {
						result = matcher.group(2);
					}
				}
				Uri uri = Uri.parse(result);
				handleUri(uri, true);
			}
		}
		finish();
	}
}