💸 Implement Digital Goods API ListPurchases on Android.

This CL takes the Mojo changes from:
  https://chromium-review.googlesource.com/c/chromium/src/+/2484038
and adds an Android implementation for them.

Once these mojo changes are wired up on the Blink side, I'll add some
tests to DigitalGoodsTests.

Bug: 1139795
Change-Id: Ib8c92cbc619b8977f37d3a9b59a3045d5c1bbb7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510271
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824001}

chrome/android/BUILD.gn

@@ -900,6 +900,7 @@ junit_binary("chrome_junit_tests") {
     "//content/public/test/android:content_java_test_support",
     "//mojo/public/java:bindings_java",
     "//mojo/public/java:system_java",
+    "//mojo/public/mojom/base:base_java",
     "//net/android:net_java",
     "//services/device/public/mojom:mojom_java",
     "//services/media_session/public/cpp/android:media_session_java",

chrome/android/chrome_java_sources.gni

@@ -191,6 +191,7 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsFactoryImpl.java",
   "java/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsImpl.java",
   "java/src/org/chromium/chrome/browser/browserservices/digitalgoods/GetDetailsConverter.java",
+  "java/src/org/chromium/chrome/browser/browserservices/digitalgoods/ListPurchasesConverter.java",
   "java/src/org/chromium/chrome/browser/browserservices/permissiondelegation/InstalledWebappBridge.java",
   "java/src/org/chromium/chrome/browser/browserservices/permissiondelegation/InstalledWebappGeolocationBridge.java",
   "java/src/org/chromium/chrome/browser/browserservices/permissiondelegation/LocationPermissionUpdater.java",

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/AcknowledgeConverter.java

@@ -4,7 +4,7 @@
 
 package org.chromium.chrome.browser.browserservices.digitalgoods;
 
-import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertResponseCodes;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertResponseCode;
 
 import android.os.Bundle;
 
@@ -60,7 +60,7 @@ class AcknowledgeConverter {
                 }
 
                 int code = args.getInt(RESPONSE_ACKNOWLEDGE_RESPONSE_CODE);
-                callback.call(convertResponseCodes(code));
+                callback.call(convertResponseCode(code));
             }
         };
     }

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsAdapter.java

@@ -15,6 +15,7 @@ import org.chromium.chrome.browser.browserservices.TrustedWebActivityClient;
 import org.chromium.components.embedder_support.util.Origin;
 import org.chromium.payments.mojom.DigitalGoods.AcknowledgeResponse;
 import org.chromium.payments.mojom.DigitalGoods.GetDetailsResponse;
+import org.chromium.payments.mojom.DigitalGoods.ListPurchasesResponse;
 
 /**
  * This class uses the {@link DigitalGoodsConverter} to convert data types between mojo types and
@@ -26,6 +27,7 @@ public class DigitalGoodsAdapter {
 
     public static final String COMMAND_ACKNOWLEDGE = "acknowledge";
     public static final String COMMAND_GET_DETAILS = "getDetails";
+    public static final String COMMAND_LIST_PURCHASES = "listPurchases";
     public static final String KEY_SUCCESS = "success";
 
     private final TrustedWebActivityClient mClient;
@@ -53,6 +55,15 @@ public class DigitalGoodsAdapter {
         execute(scope, COMMAND_ACKNOWLEDGE, args, callback, onError, onUnavailable);
     }
 
+    public void listPurchases(Uri scope, ListPurchasesResponse response) {
+        Bundle args = new Bundle();
+        TrustedWebActivityCallback callback = ListPurchasesConverter.convertCallback(response);
+        Runnable onError = () -> ListPurchasesConverter.returnClientAppError(response);
+        Runnable onUnavailable = () -> ListPurchasesConverter.returnClientAppUnavailable(response);
+
+        execute(scope, COMMAND_LIST_PURCHASES, args, callback, onError, onUnavailable);
+    }
+
     private void execute(Uri scope, String command, Bundle args,
             TrustedWebActivityCallback callback, Runnable onClientAppError,
             Runnable onClientAppUnavailable) {

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsConverter.java

@@ -4,9 +4,17 @@
 
 package org.chromium.chrome.browser.browserservices.digitalgoods;
 
+import android.os.Bundle;
+import android.os.Parcelable;
+
+import androidx.annotation.Nullable;
+
 import org.chromium.base.Log;
 import org.chromium.payments.mojom.BillingResponseCode;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * The *Converter classes take care of converting between the mojo types that
  * {@link DigitalGoodsImpl} deals with and the Android types that {@link TrustedWebActivityClient}
@@ -27,7 +35,7 @@ public class DigitalGoodsConverter {
 
     private DigitalGoodsConverter() {}
 
-    static int convertResponseCodes(int responseCode) {
+    static int convertResponseCode(int responseCode) {
         switch (responseCode) {
             case PLAY_BILLING_OK:
                 return BillingResponseCode.OK;
@@ -42,4 +50,38 @@ public class DigitalGoodsConverter {
                 return BillingResponseCode.ERROR;
         }
     }
+
+    /** Checks that the given field exists and is of the required type in a Bundle. */
+    static <T> boolean checkField(Bundle bundle, String key, Class<T> clazz) {
+        if (bundle.containsKey(key) && clazz.isAssignableFrom(bundle.get(key).getClass())) {
+            return true;
+        }
+        Log.w(TAG, "Missing field " + key + " of type " + clazz.getName() + ".");
+        return false;
+    }
+
+    /** An interface for use with {@link #convertParcelableArray}. */
+    interface Converter<T> {
+        @Nullable
+        T convert(Bundle bundle);
+    }
+
+    /**
+     * Runs through the given {@link Parcelable[]} and for each item that is a {@link Bundle}, calls
+     * {@link Converter#convert}, returning an array of the non-null results.
+     */
+    static <T> List<T> convertParcelableArray(Parcelable[] array, Converter<T> converter) {
+        List<T> list = new ArrayList<>();
+        for (Parcelable item : array) {
+            if (!(item instanceof Bundle)) {
+                Log.w(TAG, "Passed a Parcelable that was not a Bundle.");
+                continue;
+            }
+
+            T converted = converter.convert((Bundle) item);
+            if (converted != null) list.add(converted);
+        }
+
+        return list;
+    }
 }

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsImpl.java

@@ -12,6 +12,7 @@ import org.chromium.mojo.system.MojoException;
 import org.chromium.payments.mojom.DigitalGoods;
 import org.chromium.payments.mojom.DigitalGoods.AcknowledgeResponse;
 import org.chromium.payments.mojom.DigitalGoods.GetDetailsResponse;
+import org.chromium.payments.mojom.DigitalGoods.ListPurchasesResponse;
 
 /**
  * An implementation of the {@link DigitalGoods} mojo interface that communicates with Trusted Web
@@ -49,6 +50,12 @@ public class DigitalGoodsImpl implements DigitalGoods {
         }
     }
 
+    @Override
+    public void listPurchases(ListPurchasesResponse callback) {
+        String url = mDelegate.getUrl();
+        if (url != null) mAdapter.listPurchases(Uri.parse(mDelegate.getUrl()), callback);
+    }
+
     @Override
     public void close() {}
 

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/GetDetailsConverter.java

@@ -4,7 +4,9 @@
 
 package org.chromium.chrome.browser.browserservices.digitalgoods;
 
-import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertResponseCodes;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.checkField;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertParcelableArray;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertResponseCode;
 
 import android.os.Bundle;
 import android.os.Parcelable;
@@ -20,9 +22,6 @@ import org.chromium.payments.mojom.DigitalGoods.GetDetailsResponse;
 import org.chromium.payments.mojom.ItemDetails;
 import org.chromium.payments.mojom.PaymentCurrencyAmount;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * A converter that deals with the parameters and result for GetDetails calls.
  */
@@ -30,9 +29,9 @@ public class GetDetailsConverter {
     private static final String TAG = "DigitalGoods";
 
     static final String PARAM_GET_DETAILS_ITEM_IDS = "getDetails.itemIds";
-    public static final String RESPONSE_GET_DETAILS = "getDetails.response";
-    static final String RESPONSE_GET_DETAILS_RESPONSE_CODE = "getDetails.responseCode";
-    static final String RESPONSE_GET_DETAILS_DETAILS_LIST = "getDetails.detailsList";
+    public static final String RESPONSE_COMMAND = "getDetails.response";
+    static final String KEY_RESPONSE_CODE = "getDetails.responseCode";
+    static final String KEY_DETAILS_LIST = "getDetails.detailsList";
 
     static final String KEY_ID = "itemDetails.id";
     static final String KEY_TITLE = "itemDetails.title";
@@ -66,7 +65,7 @@ public class GetDetailsConverter {
         return new TrustedWebActivityCallback() {
             @Override
             public void onExtraCallback(@NonNull String callbackName, @Nullable Bundle args) {
-                if (!RESPONSE_GET_DETAILS.equals(callbackName)) {
+                if (!RESPONSE_COMMAND.equals(callbackName)) {
                     Log.w(TAG, "Wrong callback name given: " + callbackName + ".");
                     returnClientAppError(callback);
                     return;
@@ -78,39 +77,26 @@ public class GetDetailsConverter {
                     return;
                 }
 
-                if (!(args.get(RESPONSE_GET_DETAILS_RESPONSE_CODE) instanceof Integer)
-                        || !(args.get(RESPONSE_GET_DETAILS_DETAILS_LIST) instanceof Parcelable[])) {
-                    Log.w(TAG, "Poorly formed args provided.");
+                if (!checkField(args, KEY_RESPONSE_CODE, Integer.class)
+                        || !checkField(args, KEY_DETAILS_LIST, Parcelable[].class)) {
                     returnClientAppError(callback);
                     return;
                 }
 
-                int code = args.getInt(RESPONSE_GET_DETAILS_RESPONSE_CODE);
-                ItemDetails[] details = convertItemDetailsList(
-                        args.getParcelableArray(RESPONSE_GET_DETAILS_DETAILS_LIST));
-                callback.call(convertResponseCodes(code), details);
+                int code = args.getInt(KEY_RESPONSE_CODE);
+                Parcelable[] array = args.getParcelableArray(KEY_DETAILS_LIST);
+
+                ItemDetails[] details =
+                        convertParcelableArray(array, GetDetailsConverter::convertItemDetails)
+                                .toArray(new ItemDetails[0]);
+                callback.call(convertResponseCode(code), details);
             }
         };
     }
 
-    private static ItemDetails[] convertItemDetailsList(Parcelable[] list) {
-        List<ItemDetails> details = new ArrayList<>();
-        for (Parcelable item : list) {
-            details.add(convertItemDetails(item));
-        }
-        return details.toArray(new ItemDetails[0]);
-    }
-
     /** Extracts an {@link ItemDetails} from a {@link Parcelable}. */
     @Nullable
-    static ItemDetails convertItemDetails(Parcelable itemAsParcelable) {
-        if (!(itemAsParcelable instanceof Bundle)) {
-            Log.w(TAG, "Item is not a Bundle.");
-            return null;
-        }
-
-        Bundle item = (Bundle) itemAsParcelable;
-
+    static ItemDetails convertItemDetails(Bundle item) {
         for (String field : REQUIRED_FIELDS) {
             if (item.containsKey(field) && (item.get(field) instanceof String)) continue;
             Log.w(TAG, "Item does not contain field String " + field + ".");
@@ -146,11 +132,11 @@ public class GetDetailsConverter {
         return result;
     }
 
-    public static void returnClientAppUnavailable(GetDetailsResponse callback) {
+    static void returnClientAppUnavailable(GetDetailsResponse callback) {
         callback.call(BillingResponseCode.CLIENT_APP_UNAVAILABLE, new ItemDetails[0]);
     }
 
-    public static void returnClientAppError(GetDetailsResponse callback) {
+    static void returnClientAppError(GetDetailsResponse callback) {
         callback.call(BillingResponseCode.CLIENT_APP_ERROR, new ItemDetails[0]);
     }
 
@@ -159,10 +145,10 @@ public class GetDetailsConverter {
      * This would be used by the client app and is here only to help testing.
      */
     @VisibleForTesting
-    public static Bundle createItemDetailsBundle(String id, String title, String desc,
-            String currency, String value, @Nullable String subsPeriod,
-            @Nullable String freeTrialPeriod, @Nullable String introPriceCurrency,
-            @Nullable String introPriceValue, @Nullable String intoPricePeriod) {
+    static Bundle createItemDetailsBundle(String id, String title, String desc, String currency,
+            String value, @Nullable String subsPeriod, @Nullable String freeTrialPeriod,
+            @Nullable String introPriceCurrency, @Nullable String introPriceValue,
+            @Nullable String intoPricePeriod) {
         Bundle bundle = createItemDetailsBundle(id, title, desc, currency, value);
 
         bundle.putString(KEY_SUBS_PERIOD, subsPeriod);
@@ -178,7 +164,7 @@ public class GetDetailsConverter {
      * Like the above method, but provides {@code null} for all optional parameters.
      */
     @VisibleForTesting
-    public static Bundle createItemDetailsBundle(
+    static Bundle createItemDetailsBundle(
             String id, String title, String desc, String currency, String value) {
         Bundle bundle = new Bundle();
 
@@ -196,11 +182,11 @@ public class GetDetailsConverter {
      * carried out by the client app and is only here to help testing.
      */
     @VisibleForTesting
-    public static Bundle createResponseBundle(int responseCode, Bundle... itemDetails) {
+    static Bundle createResponseBundle(int responseCode, Bundle... itemDetails) {
         Bundle bundle = new Bundle();
 
-        bundle.putInt(RESPONSE_GET_DETAILS_RESPONSE_CODE, responseCode);
-        bundle.putParcelableArray(RESPONSE_GET_DETAILS_DETAILS_LIST, itemDetails);
+        bundle.putInt(KEY_RESPONSE_CODE, responseCode);
+        bundle.putParcelableArray(KEY_DETAILS_LIST, itemDetails);
 
         return bundle;
     }

chrome/android/java/src/org/chromium/chrome/browser/browserservices/digitalgoods/ListPurchasesConverter.java

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.browserservices.digitalgoods;
+
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.checkField;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertParcelableArray;
+import static org.chromium.chrome.browser.browserservices.digitalgoods.DigitalGoodsConverter.convertResponseCode;
+
+import android.os.Bundle;
+import android.os.Parcelable;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+import androidx.browser.trusted.TrustedWebActivityCallback;
+
+import org.chromium.base.Log;
+import org.chromium.mojo_base.mojom.TimeDelta;
+import org.chromium.payments.mojom.BillingResponseCode;
+import org.chromium.payments.mojom.DigitalGoods.ListPurchasesResponse;
+import org.chromium.payments.mojom.PurchaseDetails;
+import org.chromium.payments.mojom.PurchaseState;
+
+/**
+ * A converter that deals with the results of ListPurchases calls.
+ */
+class ListPurchasesConverter {
+    private static final String TAG = "DigitalGoods";
+
+    static final String RESPONSE_COMMAND = "listPurchases.response";
+    static final String KEY_PURCHASES_LIST = "listPurchases.purchasesList";
+    static final String KEY_RESPONSE_CODE = "listPurchases.responseCode";
+
+    static final String KEY_ITEM_ID = "listPurchases.itemId";
+    static final String KEY_PURCHASE_TOKEN = "listPurchases.purchaseToken";
+    static final String KEY_ACKNOWLEDGED = "listPurchases.acknowledged";
+    static final String KEY_PURCHASE_STATE = "listPurchases.purchaseState";
+    static final String KEY_PURCHASE_TIME_MS_PAST_UNIX_EPOCH = "listPurchases.purchaseTime";
+    static final String KEY_WILL_AUTO_RENEW = "listPurchases.willAutoRenew";
+
+    // These values are copied from the Play Billing library since Chrome cannot depend on it.
+    // https://developer.android.com/reference/com/android/billingclient/api/Purchase.PurchaseState
+    static final int PLAY_BILLING_PURCHASE_STATE_PENDING = 2;
+    static final int PLAY_BILLING_PURCHASE_STATE_PURCHASED = 1;
+    static final int PLAY_BILLING_PURCHASE_STATE_UNSPECIFIED = 0;
+
+    /**
+     * Produces a {@link TrustedWebActivityCallback} that calls the given
+     * {@link ListPurchasesResponse}.
+     */
+    static TrustedWebActivityCallback convertCallback(ListPurchasesResponse callback) {
+        return new TrustedWebActivityCallback() {
+            @Override
+            public void onExtraCallback(@NonNull String callbackName, @Nullable Bundle args) {
+                if (!RESPONSE_COMMAND.equals(callbackName)) {
+                    Log.w(TAG, "Wrong callback name given: " + callbackName + ".");
+                    returnClientAppError(callback);
+                    return;
+                }
+
+                if (args == null) {
+                    Log.w(TAG, "No args provided.");
+                    returnClientAppError(callback);
+                    return;
+                }
+
+                if (!checkField(args, KEY_RESPONSE_CODE, Integer.class)
+                        || !checkField(args, KEY_PURCHASES_LIST, Parcelable[].class)) {
+                    returnClientAppError(callback);
+                    return;
+                }
+
+                int code = args.getInt(KEY_RESPONSE_CODE);
+                Parcelable[] array = args.getParcelableArray(KEY_PURCHASES_LIST);
+
+                PurchaseDetails[] details = convertParcelableArray(
+                        array, ListPurchasesConverter::convertPurchaseDetails)
+                                                    .toArray(new PurchaseDetails[0]);
+                callback.call(convertResponseCode(code), details);
+            }
+        };
+    }
+
+    static PurchaseDetails convertPurchaseDetails(Bundle purchase) {
+        if (!checkField(purchase, KEY_ITEM_ID, String.class)) return null;
+        if (!checkField(purchase, KEY_PURCHASE_TOKEN, String.class)) return null;
+        if (!checkField(purchase, KEY_ACKNOWLEDGED, Boolean.class)) return null;
+        if (!checkField(purchase, KEY_PURCHASE_STATE, Integer.class)) return null;
+        if (!checkField(purchase, KEY_PURCHASE_TIME_MS_PAST_UNIX_EPOCH, Long.class)) return null;
+        if (!checkField(purchase, KEY_WILL_AUTO_RENEW, Boolean.class)) return null;
+
+        TimeDelta purchaseTime = new TimeDelta();
+        purchaseTime.microseconds = purchase.getLong(KEY_PURCHASE_TIME_MS_PAST_UNIX_EPOCH);
+
+        PurchaseDetails result = new PurchaseDetails();
+
+        result.itemId = purchase.getString(KEY_ITEM_ID);
+        result.purchaseToken = purchase.getString(KEY_PURCHASE_TOKEN);
+        result.acknowledged = purchase.getBoolean(KEY_ACKNOWLEDGED);
+        result.purchaseState = convertPurchaseState(purchase.getInt(KEY_PURCHASE_STATE));
+        result.purchaseTime = purchaseTime;
+        result.willAutoRenew = purchase.getBoolean(KEY_WILL_AUTO_RENEW);
+
+        return result;
+    }
+
+    static int convertPurchaseState(int purchaseState) {
+        switch (purchaseState) {
+            case PLAY_BILLING_PURCHASE_STATE_PENDING:
+                return PurchaseState.PENDING;
+            case PLAY_BILLING_PURCHASE_STATE_PURCHASED:
+                return PurchaseState.PURCHASED;
+            default:
+                return PurchaseState.UNKNOWN;
+        }
+    }
+
+    static void returnClientAppUnavailable(ListPurchasesResponse callback) {
+        callback.call(BillingResponseCode.CLIENT_APP_UNAVAILABLE, new PurchaseDetails[0]);
+    }
+
+    static void returnClientAppError(ListPurchasesResponse callback) {
+        callback.call(BillingResponseCode.CLIENT_APP_ERROR, new PurchaseDetails[0]);
+    }
+
+    @VisibleForTesting
+    static Bundle createPurchaseDetailsBundle(String itemId, String purchaseToken,
+            boolean acknowledged, int purchaseState, long purchaseTimeMsPastUnixEpoch,
+            boolean willAutoRenew) {
+        Bundle bundle = new Bundle();
+
+        bundle.putString(KEY_ITEM_ID, itemId);
+        bundle.putString(KEY_PURCHASE_TOKEN, purchaseToken);
+        bundle.putBoolean(KEY_ACKNOWLEDGED, acknowledged);
+        bundle.putInt(KEY_PURCHASE_STATE, purchaseState);
+        bundle.putLong(KEY_PURCHASE_TIME_MS_PAST_UNIX_EPOCH, purchaseTimeMsPastUnixEpoch);
+        bundle.putBoolean(KEY_WILL_AUTO_RENEW, willAutoRenew);
+
+        return bundle;
+    }
+
+    @VisibleForTesting
+    static Bundle createResponseBundle(int responseCode, Bundle... purchaseDetails) {
+        Bundle bundle = new Bundle();
+
+        bundle.putInt(KEY_RESPONSE_CODE, responseCode);
+        bundle.putParcelableArray(KEY_PURCHASES_LIST, purchaseDetails);
+
+        return bundle;
+    }
+}

chrome/android/javatests/src/org/chromium/chrome/browser/browserservices/digitalgoods/DigitalGoodsTest.java

@@ -10,7 +10,6 @@ import static org.chromium.chrome.browser.browserservices.TestTrustedWebActivity
 import static org.chromium.chrome.browser.browserservices.TestTrustedWebActivityService.SET_RESPONSE_BUNDLE;
 import static org.chromium.chrome.browser.browserservices.TestTrustedWebActivityService.SET_RESPONSE_NAME;
 import static org.chromium.chrome.browser.browserservices.digitalgoods.AcknowledgeConverter.RESPONSE_ACKNOWLEDGE;
-import static org.chromium.chrome.browser.browserservices.digitalgoods.GetDetailsConverter.RESPONSE_GET_DETAILS;
 
 import android.net.Uri;
 import android.os.Bundle;
@@ -115,7 +114,7 @@ public class DigitalGoodsTest {
     public void twaServiceConnected() throws TimeoutException {
         DigitalGoodsImpl impl = createFixedDigitalGoods();
 
-        setTwaServiceResponse(RESPONSE_GET_DETAILS,
+        setTwaServiceResponse(GetDetailsConverter.RESPONSE_COMMAND,
                 GetDetailsConverter.createResponseBundle(0,
                         GetDetailsConverter.createItemDetailsBundle(
                                 "id1", "Item 1", "Desc 1", "GBP", "10")));
@@ -146,7 +145,7 @@ public class DigitalGoodsTest {
 
         // Note: The response code much be 0 for success otherwise it doesn't propagate through to
         // JS.
-        setTwaServiceResponse(RESPONSE_GET_DETAILS,
+        setTwaServiceResponse(GetDetailsConverter.RESPONSE_COMMAND,
                 GetDetailsConverter.createResponseBundle(0,
                         GetDetailsConverter.createItemDetailsBundle(
                                 "id1", "Item 1", "Desc 1", "GBP", "10")));

chrome/android/javatests/src/org/chromium/chrome/browser/browserservices/digitalgoods/FakeDigitalGoods.java

@@ -8,6 +8,7 @@ import org.chromium.mojo.system.MojoException;
 import org.chromium.payments.mojom.DigitalGoods;
 import org.chromium.payments.mojom.DigitalGoods.AcknowledgeResponse;
 import org.chromium.payments.mojom.DigitalGoods.GetDetailsResponse;
+import org.chromium.payments.mojom.DigitalGoods.ListPurchasesResponse;
 import org.chromium.payments.mojom.ItemDetails;
 import org.chromium.payments.mojom.PaymentCurrencyAmount;
 
@@ -53,8 +54,11 @@ class FakeDigitalGoods implements DigitalGoods {
     }
 
     @Override
-    public void acknowledge(String purchaseToken, boolean makeAvailableAgain,
-            AcknowledgeResponse callback) { }
+    public void acknowledge(
+            String purchaseToken, boolean makeAvailableAgain, AcknowledgeResponse callback) {}
+
+    @Override
+    public void listPurchases(ListPurchasesResponse callback) {}
 
     @Override
     public void close() {}

third_party/blink/public/mojom/digital_goods/digital_goods.mojom

@@ -22,6 +22,12 @@ interface DigitalGoods {
   // permanent upgrade).
   Acknowledge(string purchase_token, bool make_available_again)
       => (BillingResponseCode code);
+
+  // Queries the associated backend for information on all items that are
+  // currently owned by the user.
+  ListPurchases()
+      => (BillingResponseCode code,
+          array<PurchaseDetails> purchase_details_list);
 };
 
 // Allow the renderer to request a |DigitalGoods| instance. DigitalGoods
@@ -64,3 +70,19 @@ enum CreateDigitalGoodsResponseCode {
   kUnsupportedPaymentMethod,
   kUnsupportedContext,
 };
+
+struct PurchaseDetails {
+  string item_id;
+  string purchase_token;
+  bool acknowledged;
+  PurchaseState purchase_state;
+  // Microseconds since the Unix epoch.
+  mojo_base.mojom.TimeDelta purchase_time;
+  bool will_auto_renew;
+};
+
+enum PurchaseState {
+  kUnknown,
+  kPurchased,
+  kPending,
+};