Add support for Google Authenticator migration data

app/build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'com.android.application'
+    id 'com.google.protobuf'
 }
 
 android {
@@ -29,6 +30,32 @@ android {
     buildFeatures {
         viewBinding true
     }
+
+    sourceSets {
+        main {
+            java {
+                srcDir "build/generated/source/proto/debug/javalite"
+            }
+            proto {
+                srcDir 'src/main/proto'
+            }
+        }
+    }
+}
+
+protobuf {
+    protoc {
+        artifact = 'com.google.protobuf:protoc:21.0-rc-1'
+    }
+    generateProtoTasks {
+        all().each { task ->
+            task.builtins {
+                java {
+                    option "lite"
+                }
+            }
+        }
+    }
 }
 
 dependencies {
@@ -43,7 +70,7 @@ dependencies {
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
     implementation "androidx.biometric:biometric:1.1.0"
-    implementation 'com.cringe_studios:CringeAuthenticatorLibrary:1.4'
+    implementation 'com.cringe_studios:CringeAuthenticatorLibrary:1.5'
     implementation 'com.google.mlkit:barcode-scanning:17.1.0'
     implementation 'com.google.code.gson:gson:2.8.9'
 
@@ -56,4 +83,6 @@ dependencies {
 
     implementation "androidx.camera:camera-view:${camerax_version}"
     implementation "androidx.camera:camera-extensions:${camerax_version}"
-}
+
+    implementation 'com.google.protobuf:protobuf-javalite:3.20.1'
+}

app/src/main/AndroidManifest.xml

@@ -47,6 +47,7 @@
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
                 <data android:scheme="otpauth" />
+                <data android:scheme="otpauth-migration" />
             </intent-filter>
         </activity>
     </application>

app/src/main/java/com/cringe_studios/cringe_authenticator/MainActivity.java

@@ -30,11 +30,13 @@ import com.cringe_studios.cringe_authenticator.fragment.HomeFragment;
 import com.cringe_studios.cringe_authenticator.fragment.MenuFragment;
 import com.cringe_studios.cringe_authenticator.fragment.NamedFragment;
 import com.cringe_studios.cringe_authenticator.fragment.SettingsFragment;
+import com.cringe_studios.cringe_authenticator.model.OTPData;
 import com.cringe_studios.cringe_authenticator.scanner.QRScannerContract;
 import com.cringe_studios.cringe_authenticator.util.DialogUtil;
 import com.cringe_studios.cringe_authenticator.util.NavigationUtil;
 import com.cringe_studios.cringe_authenticator.util.SettingsUtil;
 import com.cringe_studios.cringe_authenticator.util.StyledDialogBuilder;
+import com.cringe_studios.cringe_authenticator.util.ThemeUtil;
 import com.cringe_studios.cringe_authenticator_library.OTPType;
 
 import java.util.Locale;
@@ -58,12 +60,7 @@ public class MainActivity extends AppCompatActivity {
 
         //getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE); TODO: enable secure flag
 
-        Integer themeID = SettingsUtil.THEMES.get(SettingsUtil.getTheme(this));
+        ThemeUtil.loadTheme(this);
-        if(themeID != null) {
-            setTheme(themeID);
-        }else {
-            setTheme(R.style.Theme_CringeAuthenticator_Blue_Green);
-        }
 
         setLocale(SettingsUtil.getLocale(this));
 
@@ -106,7 +103,7 @@ public class MainActivity extends AppCompatActivity {
             Fragment fragment = NavigationUtil.getCurrentFragment(this);
             if(fragment instanceof GroupFragment) {
                 GroupFragment frag = (GroupFragment) fragment;
-                frag.addOTP(obj.getData());
+                for(OTPData d : obj.getData()) frag.addOTP(d);
             }
         });
     }
@@ -238,7 +235,7 @@ public class MainActivity extends AppCompatActivity {
             if(frag instanceof MenuFragment) {
                 ((MenuFragment) frag).addGroup(group);
             }
-        });
+        }, null);
     }
 
     @Override

app/src/main/java/com/cringe_studios/cringe_authenticator/fragment/MenuFragment.java

@@ -59,7 +59,7 @@ public class MenuFragment extends NamedFragment {
                         case 0:
                             DialogUtil.showCreateGroupDialog(getLayoutInflater(), SettingsUtil.getGroupName(requireContext(), group), newName -> {
                                 renameGroup(group, newName);
-                            });
+                            }, null);
 
                             break;
                         case 1:

app/src/main/java/com/cringe_studios/cringe_authenticator/model/OTPData.java

@@ -1,7 +1,5 @@
 package com.cringe_studios.cringe_authenticator.model;
 
-import androidx.annotation.NonNull;
-
 import com.cringe_studios.cringe_authenticator_library.OTP;
 import com.cringe_studios.cringe_authenticator_library.OTPAlgorithm;
 import com.cringe_studios.cringe_authenticator_library.OTPException;
@@ -13,6 +11,7 @@ import java.util.Objects;
 public class OTPData implements Serializable {
 
     private String name;
+    private String issuer;
     private OTPType type;
     private String secret;
     private OTPAlgorithm algorithm;
@@ -24,8 +23,9 @@ public class OTPData implements Serializable {
     // Cached
     private transient OTP otp;
 
-    public OTPData(String name, OTPType type, String secret, OTPAlgorithm algorithm, int digits, int period, long counter, boolean checksum) {
+    public OTPData(String name, String issuer, OTPType type, String secret, OTPAlgorithm algorithm, int digits, int period, long counter, boolean checksum) {
         this.name = name;
+        this.issuer = issuer;
         this.type = type;
         this.secret = secret;
         this.algorithm = algorithm;
@@ -39,6 +39,10 @@ public class OTPData implements Serializable {
         return name;
     }
 
+    public String getIssuer() {
+        return issuer;
+    }
+
     public OTPType getType() {
         return type;
     }
@@ -98,31 +102,17 @@ public class OTPData implements Serializable {
         }
     }
 
-    @NonNull
-    @Override
-    public String toString() {
-        return "OTPData{" +
-                "name='" + name + '\'' +
-                ", type=" + type +
-                ", secret='" + secret + '\'' +
-                ", algorithm=" + algorithm +
-                ", digits=" + digits +
-                ", period=" + period +
-                ", counter=" + counter +
-                ", checksum=" + checksum +
-                '}';
-    }
-
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
         OTPData otpData = (OTPData) o;
-        return digits == otpData.digits && period == otpData.period && counter == otpData.counter && Objects.equals(name, otpData.name) && type == otpData.type && Objects.equals(secret, otpData.secret) && algorithm == otpData.algorithm;
+        return digits == otpData.digits && period == otpData.period && counter == otpData.counter && checksum == otpData.checksum && Objects.equals(name, otpData.name) && Objects.equals(issuer, otpData.issuer) && type == otpData.type && Objects.equals(secret, otpData.secret) && algorithm == otpData.algorithm && Objects.equals(otp, otpData.otp);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(name, type, secret, algorithm, digits, period, counter);
+        return Objects.hash(name, issuer, type, secret, algorithm, digits, period, counter, checksum, otp);
     }
+
 }

app/src/main/java/com/cringe_studios/cringe_authenticator/scanner/QRScannerActivity.java

@@ -2,6 +2,7 @@ package com.cringe_studios.cringe_authenticator.scanner;
 
 import android.Manifest;
 import android.app.Activity;
+import android.app.Dialog;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.media.Image;
@@ -27,9 +28,12 @@ import androidx.camera.core.SurfaceOrientedMeteringPointFactory;
 import androidx.camera.lifecycle.ProcessCameraProvider;
 import androidx.core.content.ContextCompat;
 
+import com.cringe_studios.cringe_authenticator.R;
 import com.cringe_studios.cringe_authenticator.databinding.ActivityQrScannerBinding;
 import com.cringe_studios.cringe_authenticator.model.OTPData;
 import com.cringe_studios.cringe_authenticator.util.OTPParser;
+import com.cringe_studios.cringe_authenticator.util.StyledDialogBuilder;
+import com.cringe_studios.cringe_authenticator.util.ThemeUtil;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.mlkit.vision.barcode.BarcodeScanner;
 import com.google.mlkit.vision.barcode.BarcodeScanning;
@@ -48,12 +52,16 @@ public class QRScannerActivity extends AppCompatActivity {
 
     private BarcodeScanner scanner;
 
+    private boolean process = true;
+
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
 
+        ThemeUtil.loadTheme(this);
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
             requestPermissions(new String[] {Manifest.permission.CAMERA}, 1234);
         }
@@ -113,6 +121,8 @@ public class QRScannerActivity extends AppCompatActivity {
         @OptIn(markerClass = ExperimentalGetImage.class)
         @Override
         public void analyze(@NonNull ImageProxy image) {
+            if(!process) return;
+
             Image mediaImage = image.getImage();
             if(mediaImage != null) {
                 InputImage input = InputImage.fromMediaImage(mediaImage, image.getImageInfo().getRotationDegrees());
@@ -132,18 +142,40 @@ public class QRScannerActivity extends AppCompatActivity {
                         if(code == null) return;
 
                         Uri uri = Uri.parse(code.getRawValue());
-                        try {
+                        process = false;
-                            success(OTPParser.parse(uri));
+                        importUri(uri);
-                        }catch(IllegalArgumentException e) {
-                            error(e.getMessage());
-                        }
                     }
                 }).addOnFailureListener(e -> {});
             }
         }
     }
 
-    private void success(@NonNull OTPData data) {
+    private void importUri(Uri uri) {
+        if("otpauth-migration".equalsIgnoreCase(uri.getScheme())) {
+            Dialog dialog = new StyledDialogBuilder(this)
+                    .setTitle(R.string.qr_scanner_migration_title)
+                    .setMessage(R.string.qr_scanner_migration_message)
+                    .setPositiveButton(R.string.yes, (d, which) -> {
+                        try {
+                            success(OTPParser.parseMigration(uri));
+                        }catch(IllegalArgumentException e) {
+                            error(e.getMessage());
+                        }
+                    })
+                    .setNegativeButton(R.string.no, (d, which) -> cancel())
+                    .setOnDismissListener(d -> cancel())
+                    .show();
+            return;
+        }
+
+        try {
+            success(OTPParser.parse(uri));
+        }catch(IllegalArgumentException e) {
+            error(e.getMessage());
+        }
+    }
+
+    private void success(@NonNull OTPData... data) {
         Intent result = new Intent();
         result.putExtra("data", data);
         setResult(Activity.RESULT_OK, result);
@@ -157,4 +189,9 @@ public class QRScannerActivity extends AppCompatActivity {
         finish();
     }
 
+    private void cancel() {
+        setResult(RESULT_CANCELED);
+        finish();
+    }
+
 }

app/src/main/java/com/cringe_studios/cringe_authenticator/scanner/QRScannerContract.java

@@ -28,7 +28,7 @@ public class QRScannerContract extends ActivityResultContract<Void, ScannerResul
             return null;
         }
 
-        return new ScannerResult((OTPData) intent.getSerializableExtra("data"));
+        return new ScannerResult((OTPData[]) intent.getSerializableExtra("data"));
     }
 
 }

app/src/main/java/com/cringe_studios/cringe_authenticator/scanner/ScannerResult.java

@@ -7,10 +7,10 @@ import com.cringe_studios.cringe_authenticator.model.OTPData;
 
 public class ScannerResult {
 
-    private OTPData data;
+    private OTPData[] data;
     private String errorMessage;
 
-    public ScannerResult(@NonNull OTPData data) {
+    public ScannerResult(@NonNull OTPData[] data) {
         this.data = data;
     }
 
@@ -22,7 +22,7 @@ public class ScannerResult {
         return data != null;
     }
 
-    public OTPData getData() {
+    public OTPData[] getData() {
         return data;
     }
 

app/src/main/java/com/cringe_studios/cringe_authenticator/urihandler/URIHandlerActivity.java

@@ -1,8 +1,8 @@
 package com.cringe_studios.cringe_authenticator.urihandler;
 
 import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
-import android.widget.Toast;
 
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
@@ -10,11 +10,11 @@ import androidx.appcompat.app.AppCompatActivity;
 
 import com.cringe_studios.cringe_authenticator.R;
 import com.cringe_studios.cringe_authenticator.model.OTPData;
+import com.cringe_studios.cringe_authenticator.util.DialogUtil;
 import com.cringe_studios.cringe_authenticator.util.OTPParser;
 import com.cringe_studios.cringe_authenticator.util.SettingsUtil;
 import com.cringe_studios.cringe_authenticator.util.StyledDialogBuilder;
-
+import com.cringe_studios.cringe_authenticator.util.ThemeUtil;
-import java.util.List;
 
 public class URIHandlerActivity extends AppCompatActivity {
 
@@ -22,32 +22,29 @@ public class URIHandlerActivity extends AppCompatActivity {
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        ThemeUtil.loadTheme(this);
+
         Intent intent = getIntent();
         if(intent == null) {
             finish();
             return;
         }
 
+        Uri uri = intent.getData();
+        switch(uri.getScheme().toLowerCase()) {
+            case "otpauth":
+                importCode(uri);
+                break;
+            case "otpauth-migration":
+                importMigration(uri);
+                break;
+        }
+    }
+
+    private void importCode(Uri uri) {
         try {
-            OTPData data = OTPParser.parse(intent.getData());
+            OTPData data = OTPParser.parse(uri);
-            List<String> groups = SettingsUtil.getGroups(this);
+            importCodes(data);
-            String[] groupNames = new String[groups.size()];
-            for(int i = 0; i < groups.size(); i++) {
-                groupNames[i] = SettingsUtil.getGroupName(this, groups.get(i));
-            }
-
-            // TODO: add option to create new group?
-            AlertDialog dialog = new StyledDialogBuilder(this)
-                    .setTitle(R.string.uri_handler_add_code_title)
-                    .setItems(groupNames, (d, which) -> {
-                        SettingsUtil.addOTP(this, groups.get(which), data);
-                        Toast.makeText(this, R.string.uri_handler_code_added, Toast.LENGTH_SHORT).show();
-                    })
-                    .setPositiveButton(R.string.ok, (d, which) -> finish())
-                    .create();
-
-            dialog.setOnDismissListener(d -> finish());
-            dialog.show();
         }catch(IllegalArgumentException e) {
             AlertDialog dialog = new StyledDialogBuilder(this)
                     .setTitle(R.string.uri_handler_failed_title)
@@ -60,4 +57,26 @@ public class URIHandlerActivity extends AppCompatActivity {
         }
     }
 
+    private void importMigration(Uri uri) {
+        try {
+            OTPData[] data = OTPParser.parseMigration(uri);
+            importCodes(data);
+        }catch(IllegalArgumentException e) {
+            AlertDialog dialog = new StyledDialogBuilder(this)
+                    .setTitle(R.string.uri_handler_failed_title)
+                    .setMessage(e.getMessage())
+                    .setPositiveButton(R.string.ok, (d, which) -> finish())
+                    .create();
+
+            dialog.setOnDismissListener(d -> finish());
+            dialog.show();
+        }
+    }
+
+    private void importCodes(OTPData... data) {
+        DialogUtil.showImportCodeDialog(this, group -> {
+            for(OTPData d : data) SettingsUtil.addOTP(this, group, d);
+        }, this::finish);
+    }
+
 }

app/src/main/java/com/cringe_studios/cringe_authenticator/util/DialogUtil.java

@@ -5,6 +5,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
+import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
@@ -19,6 +20,8 @@ import com.cringe_studios.cringe_authenticator_library.OTPAlgorithm;
 import com.cringe_studios.cringe_authenticator_library.OTPType;
 
 import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
 
 public class DialogUtil {
 
@@ -81,13 +84,23 @@ public class DialogUtil {
         showCodeDialog(context, binding.getRoot(), () -> {
             try {
                 String name = binding.inputName.getText().toString();
+                if(name.trim().isEmpty()) {
+                    showErrorDialog(context, context.getString(R.string.otp_add_missing_name));
+                    return false;
+                }
+
+                String issuer = binding.inputIssuer.getText().toString();
+                if(issuer.trim().isEmpty()) {
+                    issuer = null;
+                }
+
                 String secret = binding.inputSecret.getText().toString();
                 OTPAlgorithm algorithm = (OTPAlgorithm) binding.inputAlgorithm.getSelectedItem();
                 int digits = (int) binding.inputDigits.getSelectedItem();
                 int period = Integer.parseInt(binding.inputPeriod.getText().toString());
                 boolean checksum = binding.inputChecksum.isChecked();
 
-                OTPData data = new OTPData(name, OTPType.TOTP, secret, algorithm, digits, period, 0, checksum);
+                OTPData data = new OTPData(name, issuer, OTPType.TOTP, secret, algorithm, digits, period, 0, checksum);
 
                 String errorMessage = data.validate();
                 if(errorMessage != null) {
@@ -134,13 +147,23 @@ public class DialogUtil {
         showCodeDialog(context, binding.getRoot(), () -> {
             try {
                 String name = binding.inputName.getText().toString();
+                if(name.trim().isEmpty()) {
+                    showErrorDialog(context, context.getString(R.string.otp_add_missing_name));
+                    return false;
+                }
+
+                String issuer = binding.inputIssuer.getText().toString();
+                if(issuer.trim().isEmpty()) {
+                    issuer = null;
+                }
+
                 String secret = binding.inputSecret.getText().toString();
                 OTPAlgorithm algorithm = (OTPAlgorithm) binding.inputAlgorithm.getSelectedItem();
                 int digits = (int) binding.inputDigits.getSelectedItem();
                 int counter = Integer.parseInt(binding.inputCounter.getText().toString());
                 boolean checksum = binding.inputChecksum.isChecked();
 
-                OTPData data = new OTPData(name, OTPType.TOTP, secret, algorithm, digits, 0, counter, checksum);
+                OTPData data = new OTPData(name, issuer, OTPType.TOTP, secret, algorithm, digits, 0, counter, checksum);
 
                 String errorMessage = data.validate();
                 if(errorMessage != null) {
@@ -171,7 +194,7 @@ public class DialogUtil {
         }
     }
 
-    public static void showCreateGroupDialog(LayoutInflater inflater, String initialName, Consumer<String> callback) {
+    public static void showCreateGroupDialog(LayoutInflater inflater, String initialName, Consumer<String> callback, Runnable onDismiss) {
         Context context = inflater.getContext();
 
         DialogCreateGroupBinding binding = DialogCreateGroupBinding.inflate(inflater);
@@ -181,7 +204,7 @@ public class DialogUtil {
                 .setTitle(R.string.action_new_group)
                 .setView(binding.getRoot())
                 .setPositiveButton(R.string.add, (view, which) -> {})
-                .setNegativeButton(R.string.cancel, (view, which) -> {})
+                .setNegativeButton(R.string.cancel, (view, which) -> { if(onDismiss != null) onDismiss.run(); })
                 .create();
 
         dialog.setOnShowListener(d -> {
@@ -194,9 +217,43 @@ public class DialogUtil {
 
                 dialog.dismiss();
                 callback.accept(binding.createGroupName.getText().toString());
+                if(onDismiss != null) onDismiss.run();
             });
         });
 
+        dialog.setOnCancelListener(d -> { if(onDismiss != null) onDismiss.run(); });
+        dialog.show();
+    }
+
+    public static void showImportCodeDialog(Context context, Consumer<String> callback, Runnable onDismiss) {
+        List<String> groups = SettingsUtil.getGroups(context);
+        String[] groupNames = new String[groups.size() + 1];
+
+        groupNames[0] = context.getString(R.string.uri_handler_create_group);
+        for(int i = 0; i < groups.size(); i++) {
+            groupNames[i + 1] = SettingsUtil.getGroupName(context, groups.get(i));
+        }
+
+        AlertDialog dialog = new StyledDialogBuilder(context)
+                .setTitle(R.string.uri_handler_add_code_title)
+                .setItems(groupNames, (d, which) -> {
+                    if(which == 0) { // Create New Group
+                        DialogUtil.showCreateGroupDialog(LayoutInflater.from(context), null, group -> {
+                            String id = UUID.randomUUID().toString();
+                            SettingsUtil.addGroup(context, id, group);
+                            callback.accept(id);
+                        }, onDismiss);
+                        return;
+                    }
+
+                    callback.accept(groups.get(which - 1));
+                    Toast.makeText(context, R.string.uri_handler_code_added, Toast.LENGTH_SHORT).show();
+                    if(onDismiss != null) onDismiss.run();
+                })
+                .setNegativeButton(R.string.cancel, (d, which) -> { if(onDismiss != null) onDismiss.run(); })
+                .setOnCancelListener(d -> { if(onDismiss != null) onDismiss.run(); })
+                .create();
+
         dialog.show();
     }
 

app/src/main/java/com/cringe_studios/cringe_authenticator/util/OTPParser.java

@@ -1,20 +1,119 @@
 package com.cringe_studios.cringe_authenticator.util;
 
 import android.net.Uri;
+import android.util.Base64;
 
 import com.cringe_studios.cringe_authenticator.model.OTPData;
+import com.cringe_studios.cringe_authenticator.proto.OTPMigration;
 import com.cringe_studios.cringe_authenticator_library.OTPAlgorithm;
 import com.cringe_studios.cringe_authenticator_library.OTPType;
+import com.cringe_studios.cringe_authenticator_library.impl.Base32;
+import com.google.protobuf.InvalidProtocolBufferException;
 
 public class OTPParser {
 
+    public static OTPData[] parseMigration(Uri uri) throws IllegalArgumentException {
+        if(!"otpauth-migration".equals(uri.getScheme())) {
+            throw new IllegalArgumentException("Wrong URI scheme");
+        }
+
+        if(!uri.isHierarchical()) {
+            throw new IllegalArgumentException("Not a hierarchical URI");
+        }
+
+        String data = uri.getQueryParameter("data");
+        if(data == null) {
+            throw new IllegalArgumentException("Missing data");
+        }
+
+        byte[] dataBytes = Base64.decode(data, Base64.DEFAULT);
+        try {
+            OTPMigration.MigrationPayload payload = OTPMigration.MigrationPayload.parseFrom(dataBytes);
+            int count = payload.getOtpParametersCount();
+            OTPData[] otps = new OTPData[count];
+            for(int i = 0; i < payload.getOtpParametersCount(); i++) {
+                OTPMigration.MigrationPayload.OtpParameters params = payload.getOtpParameters(i);
+
+                // TODO: issuer
+
+                String name = params.getName();
+                String issuer = params.getIssuer();
+
+                OTPType type;
+                switch(params.getType()) {
+                    case OTP_TYPE_UNSPECIFIED:
+                    case UNRECOGNIZED:
+                    default:
+                        // TODO: be more lenient and only exclude the broken codes
+                        throw new IllegalArgumentException("Unknown OTP type in migration");
+                    case OTP_TYPE_HOTP:
+                        type = OTPType.HOTP;
+                        break;
+                    case OTP_TYPE_TOTP:
+                        type = OTPType.TOTP;
+                        break;
+                }
+
+                String secret = Base32.encode(params.getSecret().toByteArray());
+
+                OTPAlgorithm algorithm;
+                switch(params.getAlgorithm()) {
+                    case ALGORITHM_UNSPECIFIED:
+                    case UNRECOGNIZED:
+                    default:
+                        throw new IllegalArgumentException("Unknown or unsupported algorithm in migration");
+                    case ALGORITHM_SHA1:
+                        algorithm = OTPAlgorithm.SHA1;
+                        break;
+                    case ALGORITHM_SHA256:
+                        algorithm = OTPAlgorithm.SHA256;
+                        break;
+                    case ALGORITHM_SHA512:
+                        algorithm = OTPAlgorithm.SHA512;
+                        break;
+                    case ALGORITHM_MD5:
+                        algorithm = OTPAlgorithm.MD5;
+                        break;
+                }
+
+                int digits;
+                switch(params.getDigits()) {
+                    case DIGIT_COUNT_UNSPECIFIED:
+                    case UNRECOGNIZED:
+                    default:
+                        throw new IllegalArgumentException("Unknown or unsupported digit count in migration");
+                    case DIGIT_COUNT_SIX:
+                        digits = 6;
+                        break;
+                    case DIGIT_COUNT_EIGHT:
+                        digits = 8;
+                        break;
+                }
+
+                int period = 30; // Google authenticator doesn't support other periods
+                long counter = params.getCounter();
+                boolean checksum = false; // Google authenticator doesn't support checksums
+
+                otps[i] = new OTPData(name, issuer, type, secret, algorithm, digits, period, counter, checksum);
+            }
+            return otps;
+        } catch (InvalidProtocolBufferException e) {
+            throw new IllegalArgumentException("Failed to parse migration data", e);
+        }
+    }
+
     public static OTPData parse(Uri uri) throws IllegalArgumentException {
         if(!"otpauth".equals(uri.getScheme())) {
             throw new IllegalArgumentException("Wrong URI scheme");
         }
 
+        if(!uri.isHierarchical()) {
+            throw new IllegalArgumentException("Not a hierarchical URI");
+        }
+
         String type = uri.getHost();
         String accountName = uri.getPath();
+        String issuer = uri.getQueryParameter("issuer");
         String secret = uri.getQueryParameter("secret");
         String algorithm = uri.getQueryParameter("algorithm");
         String digits = uri.getQueryParameter("digits");
@@ -58,7 +157,7 @@ public class OTPParser {
                 }
             }
 
-            OTPData data = new OTPData(accountName, fType, secret, fAlgorithm, fDigits, fPeriod, fCounter, fChecksum);
+            OTPData data = new OTPData(accountName, issuer, fType, secret, fAlgorithm, fDigits, fPeriod, fCounter, fChecksum);
 
             String errorMessage = data.validate();
             if(errorMessage != null) {

app/src/main/java/com/cringe_studios/cringe_authenticator/util/ThemeUtil.java

@@ -0,0 +1,18 @@
+package com.cringe_studios.cringe_authenticator.util;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.cringe_studios.cringe_authenticator.R;
+
+public class ThemeUtil {
+
+    public static void loadTheme(AppCompatActivity activity) {
+        Integer themeID = SettingsUtil.THEMES.get(SettingsUtil.getTheme(activity));
+        if(themeID != null) {
+            activity.setTheme(themeID);
+        }else {
+            activity.setTheme(R.style.Theme_CringeAuthenticator_Blue_Green);
+        }
+    }
+
+}

app/src/main/res/layout/dialog_input_code_hotp.xml

@@ -14,6 +14,15 @@
         android:hint="@string/otp_add_name"
         android:autofillHints="" />
 
+    <EditText
+        android:id="@+id/input_issuer"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:inputType="text"
+        android:hint="@string/otp_add_issuer"
+        android:autofillHints="" />
+
     <EditText
         android:id="@+id/input_secret"
         android:layout_width="match_parent"

app/src/main/res/layout/dialog_input_code_totp.xml

@@ -14,6 +14,15 @@
         android:hint="@string/otp_add_name"
         android:autofillHints="" />
 
+    <EditText
+        android:id="@+id/input_issuer"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:inputType="text"
+        android:hint="@string/otp_add_issuer"
+        android:autofillHints="" />
+
     <EditText
         android:id="@+id/input_secret"
         android:layout_width="match_parent"

app/src/main/res/values-de-rDE/strings.xml

@@ -20,7 +20,7 @@
     <string name="create_totp_title">Wähle den Code-Typ</string>
     <string name="action_new_group">Neue Gruppe</string>
     <string name="new_group_missing_title">Du musst einen Namen eingeben</string>
-    <string name="qr_scanner_failed">Scannen des Codes fehlgeschlagen: %s</string>
+    <string name="qr_scanner_failed">Scannen fehlgeschlagen: %s</string>
     <string name="intro_video_failed">Abspielen des Videos fehlgeschlagen</string>
     <string name="edit_otp_title">OTP bearbeiten</string>
     <string name="group_delete_title">Löschen?</string>
@@ -38,6 +38,7 @@
     <string name="settings_biometric_lock">Biometrische Authentifizierung aktivieren</string>
     <string name="uri_handler_code_added">Code hinzugefügt</string>
     <string name="uri_handler_add_code_title">Code hinzufügen</string>
+    <string name="uri_handler_create_group">Neue Gruppe erstellen</string>
     <string name="theme">Theme</string>
     <string name="otp_add_counter">Zähler</string>
     <string name="otp_add_checksum">Prüfsumme hinzufügen</string>
@@ -45,6 +46,10 @@
     <string name="otp_add_name">Name</string>
     <string name="otp_add_period">Intervall</string>
     <string name="otp_add_error">Hinzufügen des OTP-Codes fehlgeschlagen: %s</string>
+    <string name="otp_add_issuer">Aussteller (optional)</string>
+    <string name="otp_add_missing_name">Name fehlt</string>
+    <string name="qr_scanner_migration_title">OTP-Migration</string>
+    <string name="qr_scanner_migration_message">Du scheinst zu versuchen, Codes aus einer anderen App zu importieren. Willst du alle Codes in diese Gruppe importieren?</string>
     <string-array name="view_edit_delete">
         <item>Anzeigen</item>
         <item>Bearbeiten</item>

app/src/main/res/values/strings.xml

@@ -60,7 +60,7 @@
     <string name="create_totp_title">Select Code Type</string>
     <string name="action_new_group">New Group</string>
     <string name="new_group_missing_title">You need to input a name</string>
-    <string name="qr_scanner_failed">Failed to scan code: %s</string>
+    <string name="qr_scanner_failed">Scan failed: %s</string>
     <string name="intro_video_failed">Failed to play video</string>
     <string name="edit_otp_title">Edit OTP</string>
     <string name="group_delete_title">Delete?</string>
@@ -78,6 +78,7 @@
     <string name="settings_biometric_lock">Require biometric unlock</string>
     <string name="uri_handler_code_added">Code added</string>
     <string name="uri_handler_add_code_title">Add Code</string>
+    <string name="uri_handler_create_group">Create New Group</string>
     <string name="theme">Theme</string>
     <string name="otp_add_counter">Counter</string>
     <string name="otp_add_checksum">Add Checksum</string>
@@ -85,6 +86,10 @@
     <string name="otp_add_name">Name</string>
     <string name="otp_add_period">Period</string>
     <string name="otp_add_error">Failed to update OTP: %s</string>
+    <string name="otp_add_issuer">Issuer (optional)</string>
+    <string name="otp_add_missing_name">Missing name</string>
+    <string name="qr_scanner_migration_title">OTP Migration</string>
+    <string name="qr_scanner_migration_message">It seems like you\'re trying to import OTP codes from another app. Do you want to import all codes into this group?</string>
     <string-array name="view_edit_delete">
         <item>View</item>
         <item>Edit</item>

build.gradle

@@ -2,4 +2,5 @@
 plugins {
     id 'com.android.application' version '8.0.2' apply false
     id 'com.android.library' version '8.0.2' apply false
+    id 'com.google.protobuf' version '0.9.3' apply false
 }