Initial

mastodon/src/main/java/org/joinmastodon/android/OAuthActivity.java

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+package org.joinmastodon.android;
+
+import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+import android.widget.Toast;
+
+import org.joinmastodon.android.api.requests.accounts.GetOwnAccount;
+import org.joinmastodon.android.api.requests.oauth.GetOauthToken;
+import org.joinmastodon.android.api.session.AccountSessionManager;
+import org.joinmastodon.android.model.Account;
+import org.joinmastodon.android.model.Application;
+import org.joinmastodon.android.model.Instance;
+import org.joinmastodon.android.model.Token;
+
+import androidx.annotation.Nullable;
+import me.grishka.appkit.api.Callback;
+import me.grishka.appkit.api.ErrorResponse;
+
+public class OAuthActivity extends Activity{
+	@Override
+	protected void onCreate(@Nullable Bundle savedInstanceState){
+		super.onCreate(savedInstanceState);
+		Uri uri=getIntent().getData();
+		if(uri==null || isTaskRoot()){
+			finish();
+			return;
+		}
+		if(uri.getQueryParameter("error")!=null){
+			String error=uri.getQueryParameter("error_description");
+			if(TextUtils.isEmpty(error))
+				error=uri.getQueryParameter("error");
+			Toast.makeText(this, error, Toast.LENGTH_LONG).show();
+			finish();
+			restartMainActivity();
+			return;
+		}
+		String code=uri.getQueryParameter("code");
+		if(TextUtils.isEmpty(code)){
+			finish();
+			return;
+		}
+		Instance instance=AccountSessionManager.getInstance().getAuthenticatingInstance();
+		Application app=AccountSessionManager.getInstance().getAuthenticatingApp();
+		if(instance==null || app==null){
+			finish();
+			return;
+		}
+		ProgressDialog progress=new ProgressDialog(this);
+		progress.setMessage(getString(R.string.finishing_auth));
+		progress.setCancelable(false);
+		progress.show();
+		new GetOauthToken(app.clientId, app.clientSecret, code)
+				.setCallback(new Callback<>(){
+					@Override
+					public void onSuccess(Token token){
+						new GetOwnAccount()
+								.setCallback(new Callback<>(){
+									@Override
+									public void onSuccess(Account account){
+										AccountSessionManager.getInstance().addAccount(instance, token, account, app);
+										progress.dismiss();
+										finish();
+										// not calling restartMainActivity() here on purpose to have it recreated (notice different flags)
+										Intent intent=new Intent(OAuthActivity.this, MainActivity.class);
+										intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+										startActivity(intent);
+									}
+
+									@Override
+									public void onError(ErrorResponse error){
+										handleError(error);
+										progress.dismiss();
+									}
+								})
+								.exec(instance.uri, token);
+					}
+
+					@Override
+					public void onError(ErrorResponse error){
+						handleError(error);
+						progress.dismiss();
+					}
+				})
+				.execNoAuth(instance.uri);
+	}
+
+	private void handleError(ErrorResponse error){
+		error.showToast(OAuthActivity.this);
+		finish();
+		restartMainActivity();
+	}
+
+	private void restartMainActivity(){
+		Intent intent=new Intent(this, MainActivity.class);
+		intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
+		startActivity(intent);
+	}
+}