1 files changed, 120 insertions, 0 deletions
diff --git a/java/com/android/dialer/configprovider/SharedPrefConfigProvider.java b/java/com/android/dialer/configprovider/SharedPrefConfigProvider.java
new file mode 100644
index 000000000..6ee469572
--- /dev/null
+++ b/java/com/android/dialer/configprovider/SharedPrefConfigProvider.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2017 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.dialer.configprovider;
+
+import android.app.IntentService;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+import android.support.annotation.Nullable;
+import com.android.dialer.common.Assert;
+import com.android.dialer.common.LogUtil;
+import com.android.dialer.inject.ApplicationContext;
+import com.android.dialer.strictmode.DialerStrictMode;
+import com.android.dialer.util.DialerUtils;
+import javax.inject.Inject;
+
+/**
+ * {@link ConfigProvider} which uses a shared preferences file.
+ *
+ * <p>Config flags can be written using adb (with root access), for example:
+ *
+ * <pre>
+ *   adb root
+ *   adb shell am startservice -n \
+ *     'com.android.dialer/.configprovider.SharedPrefConfigProvider\$Service' \
+ *     --ez boolean_flag_name flag_value
+ * </pre>
+ *
+ * <p>(For longs use --el and for strings use --es.)
+ *
+ * <p>Flags can be viewed with:
+ *
+ * <pre>
+ *   adb shell cat \
+ *     /data/user_de/0/com.android.dialer/shared_prefs/com.android.dialer_preferences.xml
+ * </pre>
+ */
+class SharedPrefConfigProvider implements ConfigProvider {
+  private static final String PREF_PREFIX = "config_provider_prefs_";
+
+  private final Context appContext;
+
+  @Inject
+  SharedPrefConfigProvider(@ApplicationContext Context appContext) {
+    this.appContext = appContext;
+  }
+
+  /** Service to write values into {@link SharedPrefConfigProvider} using adb. */
+  public static class Service extends IntentService {
+
+    public Service() {
+      super("SharedPrefConfigProvider.Service");
+    }
+
+    @Override
+    protected void onHandleIntent(@Nullable Intent intent) {
+      if (intent == null || intent.getExtras() == null || intent.getExtras().size() != 1) {
+        LogUtil.w("SharedPrefConfigProvider.Service.onHandleIntent", "must set exactly one extra");
+        return;
+      }
+      String key = intent.getExtras().keySet().iterator().next();
+      Object value = intent.getExtras().get(key);
+      put(key, value);
+    }
+
+    private void put(String key, Object value) {
+      Editor editor = getSharedPrefs(getApplicationContext()).edit();
+      String prefixedKey = PREF_PREFIX + key;
+      if (value instanceof Boolean) {
+        editor.putBoolean(prefixedKey, (Boolean) value);
+      } else if (value instanceof Long) {
+        editor.putLong(prefixedKey, (Long) value);
+      } else if (value instanceof String) {
+        editor.putString(prefixedKey, (String) value);
+      } else {
+        throw Assert.createAssertionFailException("unsupported extra type: " + value.getClass());
+      }
+      editor.apply();
+    }
+  }
+
+  @Override
+  public String getString(String key, String defaultValue) {
+    // Reading shared prefs on the main thread is generally safe since a single instance is cached.
+    return DialerStrictMode.bypass(
+        () -> getSharedPrefs(appContext).getString(PREF_PREFIX + key, defaultValue));
+  }
+
+  @Override
+  public long getLong(String key, long defaultValue) {
+    // Reading shared prefs on the main thread is generally safe since a single instance is cached.
+    return DialerStrictMode.bypass(
+        () -> getSharedPrefs(appContext).getLong(PREF_PREFIX + key, defaultValue));
+  }
+
+  @Override
+  public boolean getBoolean(String key, boolean defaultValue) {
+    // Reading shared prefs on the main thread is generally safe since a single instance is cached.
+    return DialerStrictMode.bypass(
+        () -> getSharedPrefs(appContext).getBoolean(PREF_PREFIX + key, defaultValue));
+  }
+
+  private static SharedPreferences getSharedPrefs(Context appContext) {
+    return DialerUtils.getDefaultSharedPreferenceForDeviceProtectedStorageContext(appContext);
+  }
+}