1 files changed, 93 insertions, 0 deletions
diff --git a/packages/StatementService/src/com/android/statementservice/retriever/AndroidPackageInfoFetcher.java b/packages/StatementService/src/com/android/statementservice/retriever/AndroidPackageInfoFetcher.java
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+++ b/packages/StatementService/src/com/android/statementservice/retriever/AndroidPackageInfoFetcher.java
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.statementservice.retriever;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.res.Resources.NotFoundException;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Class that provides information about an android app from {@link PackageManager}.
+ *
+ * Visible for testing.
+ *
+ * @hide
+ */
+public class AndroidPackageInfoFetcher {
+
+    /**
+     * The name of the metadata tag in AndroidManifest.xml that stores the associated asset array
+     * ID. The metadata tag should use the android:resource attribute to point to an array resource
+     * that contains the associated assets.
+     */
+    private static final String ASSOCIATED_ASSETS_KEY = "associated_assets";
+
+    private Context mContext;
+
+    public AndroidPackageInfoFetcher(Context context) {
+        mContext = context;
+    }
+
+    /**
+     * Returns the Sha-256 fingerprints of all certificates from the specified package as a list of
+     * upper case HEX Strings with bytes separated by colons. Given an app {@link
+     * android.content.pm.Signature}, the fingerprint can be computed as {@link
+     * Utils#computeNormalizedSha256Fingerprint} {@code(signature.toByteArray())}.
+     *
+     * <p>Given a signed APK, Java 7's commandline keytool can compute the fingerprint using: {@code
+     * keytool -list -printcert -jarfile signed_app.apk}
+     *
+     * <p>Example: "10:39:38:EE:45:37:E5:9E:8E:E7:92:F6:54:50:4F:B8:34:6F:C6:B3:46:D0:BB:C4:41:5F:C3:39:FC:FC:8E:C1"
+     *
+     * @throws NameNotFoundException if an app with packageName is not installed on the device.
+     */
+    public List<String> getCertFingerprints(String packageName) throws NameNotFoundException {
+        return Utils.getCertFingerprintsFromPackageManager(packageName, mContext);
+    }
+
+    /**
+     * Returns all statements that the specified package makes in its AndroidManifest.xml.
+     *
+     * @throws NameNotFoundException if the app is not installed on the device.
+     */
+    public List<String> getStatements(String packageName) throws NameNotFoundException {
+        PackageInfo packageInfo = mContext.getPackageManager().getPackageInfo(
+                packageName, PackageManager.GET_META_DATA);
+        ApplicationInfo appInfo = packageInfo.applicationInfo;
+        if (appInfo.metaData == null) {
+            return Collections.<String>emptyList();
+        }
+        int tokenResourceId = appInfo.metaData.getInt(ASSOCIATED_ASSETS_KEY);
+        if (tokenResourceId == 0) {
+            return Collections.<String>emptyList();
+        }
+        try {
+            return Arrays.asList(
+                    mContext.getPackageManager().getResourcesForApplication(packageName)
+                    .getStringArray(tokenResourceId));
+        } catch (NotFoundException e) {
+            return Collections.<String>emptyList();
+        }
+    }
+}