Removed boot receiver. Added reboot handling by boot id.

build.gradle

@@ -4,7 +4,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
     }
 }

library/src/main/AndroidManifest.xml

@@ -7,16 +7,8 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
 
-    <!--Detect boot to invalidate TrueTime-->
-    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
 
     <application>
-        <!-- Start the Service if applicable on boot -->
-        <receiver android:name=".BootCompletedBroadcastReceiver">
-            <intent-filter>
-                <action android:name="android.intent.action.BOOT_COMPLETED"/>
-            </intent-filter>
-        </receiver>
     </application>
 
 </manifest>

library/src/main/java/com/instacart/library/truetime/CacheInterface.java

@@ -5,11 +5,16 @@ public interface CacheInterface {
     String KEY_CACHED_BOOT_TIME = "com.instacart.library.truetime.cached_boot_time";
     String KEY_CACHED_DEVICE_UPTIME = "com.instacart.library.truetime.cached_device_uptime";
     String KEY_CACHED_SNTP_TIME = "com.instacart.library.truetime.cached_sntp_time";
+    String KEY_CACHED_BOOT_ID = "com.instacart.library.truetime.cached_boot_id";
 
     void put(String key, long value);
 
+    void put(String key, String value);
+
     long get(String key, long defaultValue);
 
+    String get(String key, String defaultValue);
+
     void clear();
 
 

library/src/main/java/com/instacart/library/truetime/DiskCacheClient.java

@@ -2,6 +2,7 @@
 
 import android.os.SystemClock;
 
+import static com.instacart.library.truetime.CacheInterface.KEY_CACHED_BOOT_ID;
 import static com.instacart.library.truetime.CacheInterface.KEY_CACHED_BOOT_TIME;
 import static com.instacart.library.truetime.CacheInterface.KEY_CACHED_DEVICE_UPTIME;
 import static com.instacart.library.truetime.CacheInterface.KEY_CACHED_SNTP_TIME;
@@ -87,6 +88,21 @@ long getCachedSntpTime() {
         return _cacheInterface.get(KEY_CACHED_SNTP_TIME, 0L);
     }
 
+    String getCachedBootId() {
+        if (cacheUnavailable()) {
+            return null;
+        }
+
+        return _cacheInterface.get(KEY_CACHED_BOOT_ID, null);
+    }
+
+    void cacheBootId(String bootId) {
+        if (cacheUnavailable())
+            return;
+
+        _cacheInterface.put(KEY_CACHED_BOOT_ID, bootId);
+    }
+
     // -----------------------------------------------------------------------------------
 
     private boolean cacheUnavailable() {

library/src/main/java/com/instacart/library/truetime/SharedPreferenceCacheImpl.java

@@ -20,11 +20,21 @@ public void put(String key, long value) {
         _sharedPreferences.edit().putLong(key, value).apply();
     }
 
+    @Override
+    public void put(String key, String value) {
+        _sharedPreferences.edit().putString(key, value).apply();
+    }
+
     @Override
     public long get(String key, long defaultValue) {
         return _sharedPreferences.getLong(key, defaultValue);
     }
 
+    @Override
+    public String get(String key, String defaultValue) {
+        return _sharedPreferences.getString(key, defaultValue);
+    }
+
     @Override
     public void clear() {
         remove(CacheInterface.KEY_CACHED_BOOT_TIME);

library/src/main/java/com/instacart/library/truetime/TrueTime.java

@@ -1,10 +1,16 @@
 package com.instacart.library.truetime;
 
 import android.content.Context;
+import android.os.Build;
 import android.os.SystemClock;
+import android.provider.Settings;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
 import java.io.IOException;
 import java.util.Date;
 import java.util.Locale;
+import java.util.logging.Logger;
 
 public class TrueTime {
 
@@ -55,6 +61,7 @@ public void initialize() throws IOException {
      */
     public synchronized TrueTime withSharedPreferencesCache(Context context) {
         DISK_CACHE_CLIENT.enableCacheInterface(new SharedPreferenceCacheImpl(context));
+        checkBootId(context);
         return INSTANCE;
     }
 
@@ -173,4 +180,50 @@ private static long _getCachedSntpTime() {
         return cachedSntpTime;
     }
 
+    public void checkBootId(Context context) {
+        String cachedBootId = DISK_CACHE_CLIENT.getCachedBootId();
+
+        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
+            try {
+                String bootId = String.valueOf(Settings.Global.getInt(context.getContentResolver(),
+                        Settings.Global.BOOT_COUNT));
+
+                if (cachedBootId == null || !cachedBootId.equals(bootId)) {
+                    DISK_CACHE_CLIENT.cacheBootId(bootId);
+                    clearCachedInfo();
+                }
+            } catch (Settings.SettingNotFoundException e) {
+                clearCachedInfo();
+            }
+        } else {
+            BufferedReader bufferedReader = null;
+
+            try {
+                bufferedReader = new BufferedReader(
+                        new FileReader("proc/sys/kernel/random/boot_id"));
+
+                StringBuilder bootId = new StringBuilder();
+                String line;
+
+                while ((line = bufferedReader.readLine()) != null) {
+                    bootId.append(line);
+                }
+
+                if (cachedBootId == null || !cachedBootId.equals(bootId.toString())) {
+                    DISK_CACHE_CLIENT.cacheBootId(bootId.toString());
+                    clearCachedInfo();
+                }
+            } catch (IOException e) {
+                clearCachedInfo();
+            } finally {
+                if (bufferedReader != null) {
+                    try {
+                        bufferedReader.close();
+                    } catch (IOException e) {
+                    }
+                }
+            }
+        }
+    }
+
 }