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Implement OTP Autofill from SMS module
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9 changes: 9 additions & 0 deletions
9
autofill/src/main/java/com/asemlab/samples/autofill/AutoFillApp.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,9 @@ | ||
| package com.asemlab.samples.autofill | ||
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| import android.app.Application | ||
| import androidx.lifecycle.MutableLiveData | ||
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| class AutoFillApp : Application() { | ||
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| val otp = MutableLiveData<String>() | ||
| } |
49 changes: 49 additions & 0 deletions
49
autofill/src/main/java/com/asemlab/samples/autofill/services/SMSReceiver.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,49 @@ | ||
| package com.asemlab.samples.autofill.services | ||
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| import android.content.BroadcastReceiver | ||
| import android.content.Context | ||
| import android.content.Intent | ||
| import android.util.Log | ||
| import com.asemlab.samples.autofill.AutoFillApp | ||
| import com.google.android.gms.auth.api.phone.SmsRetriever | ||
| import com.google.android.gms.common.api.CommonStatusCodes | ||
| import com.google.android.gms.common.api.Status | ||
| import java.util.regex.Pattern | ||
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| /** | ||
| * BroadcastReceiver to wait for SMS messages. This can be registered either | ||
| * in the AndroidManifest or at runtime. Should filter Intents on | ||
| * SmsRetriever.SMS_RETRIEVED_ACTION. | ||
| */ | ||
| class SMSReceiver : BroadcastReceiver() { | ||
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| override fun onReceive(context: Context, intent: Intent) { | ||
| Log.d("SMS Receiver", "OnReceive") | ||
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| if (SmsRetriever.SMS_RETRIEVED_ACTION == intent.action) { | ||
| val extras = intent.extras | ||
| val status = extras?.get(SmsRetriever.EXTRA_STATUS) as Status | ||
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| when (status.statusCode) { | ||
| CommonStatusCodes.SUCCESS -> { | ||
| // TODO 5. Get SMS message contents and parse the otp | ||
| val message = extras.getString(SmsRetriever.EXTRA_SMS_MESSAGE) | ||
| val pattern = (Pattern.compile("Your code is: (\\d{4}).*")) | ||
| message?.let { | ||
| val matcher = pattern.matcher(it) | ||
| if (matcher.find()) { | ||
| (context.applicationContext as AutoFillApp).otp.postValue(matcher.group(1)) | ||
| } | ||
| } | ||
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| Log.d("SMS Receiver", "message: $message") | ||
| } | ||
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| CommonStatusCodes.TIMEOUT -> { | ||
| Log.e("SMS Receiver", "Timeout: ${status.statusMessage}") | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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77 changes: 77 additions & 0 deletions
77
autofill/src/main/java/com/asemlab/samples/autofill/utils/AppSignatureHelper.java
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| @@ -0,0 +1,77 @@ | ||
| package com.asemlab.samples.autofill.utils; | ||
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| import android.content.Context; | ||
| import android.content.ContextWrapper; | ||
| import android.content.pm.PackageManager; | ||
| import android.content.pm.Signature; | ||
| import android.util.Base64; | ||
| import android.util.Log; | ||
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| import java.nio.charset.StandardCharsets; | ||
| import java.security.MessageDigest; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
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| /** | ||
| * This is a helper class to generate your message hash to be included in your SMS message. | ||
| * | ||
| * Without the correct hash, your app won't receive the message callback. This only needs to be | ||
| * generated once per app and stored. Then you can remove this helper class from your code. | ||
| */ | ||
| public class AppSignatureHelper extends ContextWrapper { | ||
| public static final String TAG = AppSignatureHelper.class.getSimpleName(); | ||
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| private static final String HASH_TYPE = "SHA-256"; | ||
| public static final int NUM_HASHED_BYTES = 9; | ||
| public static final int NUM_BASE64_CHAR = 11; | ||
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| public AppSignatureHelper(Context context) { | ||
| super(context); | ||
| } | ||
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| public ArrayList<String> getAppSignatures() { | ||
| ArrayList<String> appCodes = new ArrayList<>(); | ||
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| try { | ||
| // Get all package signatures for the current package | ||
| String packageName = getPackageName(); | ||
| PackageManager packageManager = getPackageManager(); | ||
| Signature[] signatures = packageManager.getPackageInfo(packageName, | ||
| PackageManager.GET_SIGNATURES).signatures; | ||
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| // For each signature create a compatible hash | ||
| for (Signature signature : signatures) { | ||
| String hash = hash(packageName, signature.toCharsString()); | ||
| if (hash != null) { | ||
| appCodes.add(String.format("%s", hash)); | ||
| } | ||
| } | ||
| } catch (PackageManager.NameNotFoundException e) { | ||
| Log.e(TAG, "Unable to find package to obtain hash.", e); | ||
| } | ||
| return appCodes; | ||
| } | ||
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| private static String hash(String packageName, String signature) { | ||
| String appInfo = packageName + " " + signature; | ||
| try { | ||
| MessageDigest messageDigest = MessageDigest.getInstance(HASH_TYPE); | ||
| messageDigest.update(appInfo.getBytes(StandardCharsets.UTF_8)); | ||
| byte[] hashSignature = messageDigest.digest(); | ||
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| // truncated into NUM_HASHED_BYTES | ||
| hashSignature = Arrays.copyOfRange(hashSignature, 0, NUM_HASHED_BYTES); | ||
| // encode into Base64 | ||
| String base64Hash = Base64.encodeToString(hashSignature, Base64.NO_PADDING | Base64.NO_WRAP); | ||
| base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR); | ||
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| Log.d(TAG, String.format("pkg: %s -- hash: %s", packageName, base64Hash)); | ||
| return base64Hash; | ||
| } catch (NoSuchAlgorithmException e) { | ||
| Log.e(TAG, "hash:NoSuchAlgorithm", e); | ||
| } | ||
| return null; | ||
| } | ||
| } |
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