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Code Issues Packages Projects Releases Wiki Activity

Verify purchases

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This commit is contained in:
M66B
2018-12-16 15:08:50 +01:00
parent cca2ef0b60
commit ed64bc2a6b
2 changed files with 31 additions and 6 deletions
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36
app/src/main/java/eu/faircode/email/ActivityBilling.java
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@@ -29,6 +29,7 @@ import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.util.Base64;
import android.util.Log;
import com.android.billingclient.api.BillingClient;
@@ -38,7 +39,11 @@ import com.android.billingclient.api.Purchase;
import com.android.billingclient.api.PurchasesUpdatedListener;
import com.google.android.material.snackbar.Snackbar;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import java.util.List;
import androidx.annotation.Nullable;
@@ -213,15 +218,34 @@ abstract class ActivityBilling extends ActivityBase implements PurchasesUpdatedL
if (purchases != null) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = prefs.edit();
if (prefs.getBoolean("play_store", true))
editor.remove("pro");
for (Purchase purchase : purchases) {
Log.i(Helper.TAG, "IAB SKU=" + purchase.getSku());
if ((BuildConfig.APPLICATION_ID + ".pro").equals(purchase.getSku())) {
editor.putBoolean("pro", true);
Log.i(Helper.TAG, "IAB pro features activated");
for (Purchase purchase : purchases)
try {
Log.i(Helper.TAG, "IAB SKU=" + purchase.getSku());
byte[] decodedKey = Base64.decode(getString(R.string.public_key), Base64.DEFAULT);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(decodedKey));
Signature sig = Signature.getInstance("SHA1withRSA");
sig.initVerify(publicKey);
sig.update(purchase.getOriginalJson().getBytes());
if (sig.verify(Base64.decode(purchase.getSignature(), Base64.DEFAULT))) {
if ((BuildConfig.APPLICATION_ID + ".pro").equals(purchase.getSku())) {
editor.putBoolean("pro", true);
Log.i(Helper.TAG, "IAB pro features activated");
}
} else {
Log.w(Helper.TAG, "Invalid signature");
Snackbar.make(getVisibleView(), R.string.title_pro_invalid, Snackbar.LENGTH_LONG).show();
}
} catch (Throwable ex) {
Log.e(Helper.TAG, ex + "\n" + Log.getStackTraceString(ex));
Snackbar.make(getVisibleView(), ex.getMessage(), Snackbar.LENGTH_LONG).show();
}
}
editor.apply();
}
}