TubeLab-App-Android/app/src/main/java/app/fedilab/fedilabtube/LoginActivity.java

package app.fedilab.fedilabtube;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.ForegroundColorSpan;
import android.text.style.UnderlineSpan;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;

import app.fedilab.fedilabtube.asynctasks.UpdateAccountInfoAsyncTask;
import app.fedilab.fedilabtube.client.HttpsConnection;
import app.fedilab.fedilabtube.helper.Helper;
import es.dmoral.toasty.Toasty;


public class LoginActivity extends AppCompatActivity {


    private static String client_id;
    private static String client_secret;
    private static String instance;
    private static String host;
    private EditText login_uid;
    private EditText login_passwd;
    private Button connectionButton;
    private String actionToken;
    private Spinner info_instance;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_login);
        if (getSupportActionBar() != null)
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        TextView create_an_account_peertube = findViewById(R.id.create_an_account_peertube);



        create_an_account_peertube.setOnClickListener(v -> {
            Intent mainActivity = new Intent(LoginActivity.this, PeertubeRegisterActivity.class);
            Bundle b = new Bundle();
            b.putString("instance", host);
            mainActivity.putExtras(b);
            startActivity(mainActivity);
        });


        login_uid = findViewById(R.id.login_uid);
        login_passwd = findViewById(R.id.login_passwd);
        connectionButton = findViewById(R.id.login_button);
        info_instance = findViewById(R.id.info_instance);

        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, Helper.academies);
        info_instance.setAdapter(arrayAdapter);

        info_instance.setSelection(0);
        info_instance.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                host = Helper.academies[position];
                SpannableString content_create = new SpannableString(getString(R.string.join_peertube_on, host));
                content_create.setSpan(new UnderlineSpan(), 0, content_create.length(), 0);
                content_create.setSpan(new ForegroundColorSpan(ContextCompat.getColor(LoginActivity.this, R.color.colorAccent)), 0, content_create.length(),
                        Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
                create_an_account_peertube.setText(content_create);
                retrievesClientId();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });


        connectionButton.setEnabled(false);

    }

    @Override
    protected void onResume() {
        super.onResume();
        retrievesClientId();
    }

    private void retrievesClientId() {
        String instanceFromField = info_instance.getSelectedItem().toString();
        if (instanceFromField.startsWith("http://")) {
            instanceFromField = instanceFromField.replace("http://", "");
        }
        if (instanceFromField.startsWith("https://")) {
            instanceFromField = instanceFromField.replace("https://", "");
        }
        String host = instanceFromField;
        try {
            URL url = new URL(instanceFromField);
            host = url.getHost();
        } catch (MalformedURLException ignored) {
        }
        instance = Helper.getPeertubeUrl(host);
        try {
            instance = URLEncoder.encode(instance, "utf-8");
        } catch (UnsupportedEncodingException e) {
            Toasty.error(LoginActivity.this, getString(R.string.client_error), Toast.LENGTH_LONG).show();
        }
        actionToken = "/api/v1/oauth-clients/local";
        final HashMap<String, String> parameters = new HashMap<>();
        parameters.put(Helper.CLIENT_NAME, Helper.CLIENT_NAME_VALUE);
        parameters.put(Helper.REDIRECT_URIS, Helper.REDIRECT_CONTENT);
        parameters.put(Helper.SCOPES, Helper.OAUTH_SCOPES_PEERTUBE);
        parameters.put(Helper.WEBSITE, Helper.WEBSITE_VALUE);
        new Thread(() -> {
            try {
                String response = new HttpsConnection(LoginActivity.this, instance).get("https://" + instance + actionToken, 30, parameters, null);
                runOnUiThread(() -> {
                    JSONObject resobj;
                    try {
                        resobj = new JSONObject(response);
                        client_id = resobj.get(Helper.CLIENT_ID).toString();
                        client_secret = resobj.get(Helper.CLIENT_SECRET).toString();
                        manageClient(client_id, client_secret);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                });
            } catch (final Exception e) {
                e.printStackTrace();

                runOnUiThread(() -> {

                    String message = null;
                    if (e.getLocalizedMessage() != null) {
                        message = e.getMessage();
                    }
                    if (message == null) {
                        message = getString(R.string.client_error);
                    }

                    Toasty.error(LoginActivity.this, message, Toast.LENGTH_LONG).show();
                });
            }
        }).start();
        String finalHost = host;
        connectionButton.setOnClickListener(v -> {

            connectionButton.setEnabled(false);
            parameters.clear();
            SharedPreferences sharedpreferences = getSharedPreferences(Helper.APP_PREFS, MODE_PRIVATE);
            parameters.put(Helper.CLIENT_ID, sharedpreferences.getString(Helper.CLIENT_ID, null));
            parameters.put(Helper.CLIENT_SECRET, sharedpreferences.getString(Helper.CLIENT_SECRET, null));
            parameters.put("grant_type", "password");
            try {
                parameters.put("username", URLEncoder.encode(login_uid.getText().toString().trim().toLowerCase(), "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                parameters.put("username", login_uid.getText().toString().trim().toLowerCase());
            }
            try {
                parameters.put("password", URLEncoder.encode(login_passwd.getText().toString(), "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                parameters.put("password", login_passwd.getText().toString());
            }
            parameters.put("scope", "user");
            String oauthUrl = "/api/v1/users/token";
            new Thread(() -> {
                try {
                    String response = new HttpsConnection(LoginActivity.this, instance).post("https://" + instance + oauthUrl, 30, parameters, null);
                    runOnUiThread(() -> {
                        JSONObject resobj;
                        try {
                            resobj = new JSONObject(response);
                            String token = resobj.get("access_token").toString();
                            String refresh_token = null;
                            if (resobj.has("refresh_token"))
                                refresh_token = resobj.getString("refresh_token");
                            SharedPreferences.Editor editor = sharedpreferences.edit();
                            editor.putString(Helper.PREF_KEY_OAUTH_TOKEN, token);
                            editor.apply();
                            //Update the account with the token;
                            new UpdateAccountInfoAsyncTask(LoginActivity.this, token, client_id, client_secret, refresh_token, finalHost).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    });
                } catch (final Exception e) {
                    e.printStackTrace();
                    runOnUiThread(() -> {
                        connectionButton.setEnabled(true);
                        runOnUiThread(() -> {
                            String message;
                            if (e.getLocalizedMessage() != null && e.getLocalizedMessage().trim().length() > 0)
                                message = e.getLocalizedMessage();
                            else if (e.getMessage() != null && e.getMessage().trim().length() > 0)
                                message = e.getMessage();
                            else
                                message = getString(R.string.client_error);
                            Toasty.error(LoginActivity.this, message, Toast.LENGTH_LONG).show();
                        });
                    });
                }
            }).start();
        });
    }

    private void manageClient(String client_id, String client_secret) {

        SharedPreferences sharedpreferences = getSharedPreferences(Helper.APP_PREFS, MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedpreferences.edit();
        editor.putString(Helper.CLIENT_ID, client_id);
        editor.putString(Helper.CLIENT_SECRET, client_secret);
        editor.apply();
        connectionButton.setEnabled(true);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            finish();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


}