1 files changed, 147 insertions, 0 deletions
diff --git a/java/com/android/dialer/strictmode/DialerStrictMode.java b/java/com/android/dialer/strictmode/DialerStrictMode.java
new file mode 100644
index 000000000..f895f7c46
--- /dev/null
+++ b/java/com/android/dialer/strictmode/DialerStrictMode.java
@@ -0,0 +1,147 @@
+/*
+ * 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.strictmode;
+
+import android.app.Application;
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.StrictMode;
+import android.os.StrictMode.ThreadPolicy;
+import android.os.StrictMode.VmPolicy;
+import android.preference.PreferenceManager;
+import android.support.annotation.AnyThread;
+import android.support.annotation.MainThread;
+import android.support.v4.os.UserManagerCompat;
+import com.android.dialer.buildtype.BuildType;
+import com.android.dialer.function.Supplier;
+import com.android.dialer.util.DialerUtils;
+
+/** Enables strict mode for the application, and provides means of temporarily disabling it. */
+public final class DialerStrictMode {
+
+  private static final VmPolicy VM_DEATH_PENALTY =
+      new StrictMode.VmPolicy.Builder().penaltyLog().penaltyDeath().build();
+
+  private static final ThreadPolicy THREAD_LOG_PENALTY =
+      new StrictMode.ThreadPolicy.Builder().penaltyLog().build();
+  private static final ThreadPolicy THREAD_DEATH_PENALTY =
+      new StrictMode.ThreadPolicy.Builder().penaltyLog().penaltyDeath().build();
+
+  private DialerStrictMode() {}
+
+  /** Initializes strict mode on application start. */
+  @MainThread
+  public static void onApplicationCreate(Application application) {
+    if (isStrictModeAllowed()) {
+      warmupSharedPrefs(application);
+      StrictModeUtils.setRecommendedMainThreadPolicy(THREAD_DEATH_PENALTY);
+      StrictModeUtils.setRecommendedVMPolicy(VM_DEATH_PENALTY);
+
+      // Because Android resets StrictMode policies after Application.onCreate is done, we set it
+      // again right after.
+      // See cl/105932355 for the discussion.
+      // See b/36951662 for the public bug.
+      Handler handler = new Handler(Looper.myLooper());
+      handler.postAtFrontOfQueue(
+          () -> StrictModeUtils.setRecommendedMainThreadPolicy(THREAD_DEATH_PENALTY));
+    }
+  }
+
+  /**
+   * We frequently access shared preferences on the main thread, which causes strict mode
+   * violations. When strict mode is allowed, warm up the shared preferences so that later uses of
+   * shared preferences access the in-memory versions and we don't have to bypass strict mode at
+   * every point in the application where shared preferences are accessed.
+   */
+  private static void warmupSharedPrefs(Application application) {
+    // From credential-encrypted (CE) storage, i.e.:
+    //    /data/data/com.android.dialer/shared_prefs
+
+    if (UserManagerCompat.isUserUnlocked(application)) {
+      // <package_name>_preferences.xml
+      PreferenceManager.getDefaultSharedPreferences(application);
+
+      // <package_name>.xml
+      application.getSharedPreferences(application.getPackageName(), Context.MODE_PRIVATE);
+    }
+
+    // From device-encrypted (DE) storage, i.e.:
+    //   /data/user_de/0/com.android.dialer/shared_prefs/
+
+    // <package_name>_preferences.xml
+    DialerUtils.getDefaultSharedPreferenceForDeviceProtectedStorageContext(application);
+  }
+
+  private static boolean isStrictModeAllowed() {
+    return BuildType.get() == BuildType.BUGFOOD;
+  }
+
+  private static boolean onMainThread() {
+    return Looper.getMainLooper().equals(Looper.myLooper());
+  }
+
+  /**
+   * Convenience method for disabling and enabling the thread policy death penalty using lambdas.
+   *
+   * <p>For example:
+   *
+   * <p><code>
+   *   Value foo = DialerStrictMode.bypass(() -> doDiskAccessOnMainThreadReturningValue());
+   * </code>
+   *
+   * <p>The thread policy is only mutated if this is called from the main thread.
+   */
+  @AnyThread
+  public static <T> T bypass(Supplier<T> supplier) {
+    if (isStrictModeAllowed() && onMainThread()) {
+      ThreadPolicy originalPolicy = StrictMode.getThreadPolicy();
+      StrictModeUtils.setRecommendedMainThreadPolicy(THREAD_LOG_PENALTY);
+      try {
+        return supplier.get();
+      } finally {
+        StrictMode.setThreadPolicy(originalPolicy);
+      }
+    }
+    return supplier.get();
+  }
+
+  /**
+   * Convenience method for disabling and enabling the thread policy death penalty using lambdas.
+   *
+   * <p>For example:
+   *
+   * <p><code>
+   *   DialerStrictMode.bypass(() -> doDiskAccessOnMainThread());
+   * </code>
+   *
+   * <p>The thread policy is only mutated if this is called from the main thread.
+   */
+  @AnyThread
+  public static void bypass(Runnable runnable) {
+    if (isStrictModeAllowed() && onMainThread()) {
+      ThreadPolicy originalPolicy = StrictMode.getThreadPolicy();
+      StrictModeUtils.setRecommendedMainThreadPolicy(THREAD_LOG_PENALTY);
+      try {
+        runnable.run();
+      } finally {
+        StrictMode.setThreadPolicy(originalPolicy);
+      }
+    }
+    runnable.run();
+  }
+}