Avoid NPE from Android

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/utils/SystemDeviceInfo.android.kt

@@ -57,13 +57,13 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
     @Transient
     final override lateinit var context: Context
 
-    override val display: ByteArray get() = Build.DISPLAY.toByteArray()
-    override val product: ByteArray get() = Build.PRODUCT.toByteArray()
-    override val device: ByteArray get() = Build.DEVICE.toByteArray()
-    override val board: ByteArray get() = Build.BOARD.toByteArray()
-    override val brand: ByteArray get() = Build.BRAND.toByteArray()
-    override val model: ByteArray get() = Build.MODEL.toByteArray()
-    override val bootloader: ByteArray get() = Build.BOOTLOADER.toByteArray()
+    override val display: ByteArray get() = Build.DISPLAY.orEmpty().toByteArray()
+    override val product: ByteArray get() = Build.PRODUCT.orEmpty().toByteArray()
+    override val device: ByteArray get() = Build.DEVICE.orEmpty().toByteArray()
+    override val board: ByteArray get() = Build.BOARD.orEmpty().toByteArray()
+    override val brand: ByteArray get() = Build.BRAND.orEmpty().toByteArray()
+    override val model: ByteArray get() = Build.MODEL.orEmpty().toByteArray()
+    override val bootloader: ByteArray get() = Build.BOOTLOADER.orEmpty().toByteArray()
 
     override val baseBand: ByteArray
         @SuppressLint("PrivateApi")
@@ -72,17 +72,17 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
             Class.forName("android.os.SystemProperties").let { clazz ->
                 clazz.getMethod("get", String::class.java, String::class.java)
                     .invoke(clazz.newInstance(), "gsm.version.baseband", "no message")
-                    ?.toString() ?: ""
+                    ?.toString().orEmpty()
             }
         }.getOrElse { "" }.toByteArray()
 
     override val fingerprint: ByteArray get() = Build.FINGERPRINT.toByteArray()
     override val procVersion: ByteArray
-        get() = kotlin.runCatching { File("/proc/version").useLines { it.firstOrNull() ?: "" }.toByteArray() }
+        get() = kotlin.runCatching { File("/proc/version").useLines { it.firstOrNull().orEmpty() }.toByteArray() }
             .getOrElse { byteArrayOf() }
     override val bootId: ByteArray
         get() = kotlin.runCatching {
-            File("/proc/sys/kernel/random/boot_id").useLines { it.firstOrNull() ?: "" }.toByteArray()
+            File("/proc/sys/kernel/random/boot_id").useLines { it.firstOrNull().orEmpty() }.toByteArray()
         }.getOrEmpty()
     override val version: DeviceInfo.Version get() = Version
 
@@ -91,7 +91,7 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
             val telephonyManager =
                 context.applicationContext.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
             if (telephonyManager.simState == 5) {
-                telephonyManager.simOperatorName.toByteArray()
+                telephonyManager.simOperatorName.orEmpty().toByteArray()
             } else byteArrayOf()
         }.getOrEmpty()
 
@@ -99,19 +99,22 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
     override val macAddress: ByteArray get() = "02:00:00:00:00:00".toByteArray()
     override val wifiBSSID: ByteArray?
         get() = kotlin.runCatching {
-            (context.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager).connectionInfo.bssid.toByteArray()
+            (context.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager).connectionInfo.bssid.orEmpty()
+                .toByteArray()
         }.getOrEmpty()
 
     override val wifiSSID: ByteArray?
         get() = kotlin.runCatching {
-            (context.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager).connectionInfo.ssid.toByteArray()
+            (context.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager).connectionInfo.ssid.orEmpty()
+                .toByteArray()
         }.getOrEmpty()
 
     @OptIn(MiraiInternalAPI::class)
     override val imsiMd5: ByteArray
         @SuppressLint("HardwareIds")
         get() = kotlin.runCatching {
-            (context.applicationContext.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager).subscriberId.toByteArray()
+            (context.applicationContext.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager).subscriberId.orEmpty()
+                .toByteArray()
         }.getOrEmpty().md5()
 
     override val imei: String
@@ -122,7 +125,7 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
             } else {
                 @Suppress("DEPRECATION")
                 (context.applicationContext.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager).deviceId
-            }
+            }.orEmpty()
         }.getOrElse { "" }
 
     override val androidId: ByteArray get() = Build.ID.toByteArray()
@@ -130,9 +133,9 @@ actual open class SystemDeviceInfo actual constructor() : DeviceInfo() {
 
     @Serializable
     actual object Version : DeviceInfo.Version {
-        override val incremental: ByteArray get() = Build.VERSION.INCREMENTAL.toByteArray()
-        override val release: ByteArray get() = Build.VERSION.RELEASE.toByteArray()
-        override val codename: ByteArray get() = Build.VERSION.CODENAME.toByteArray()
+        override val incremental: ByteArray get() = Build.VERSION.INCREMENTAL.orEmpty().toByteArray()
+        override val release: ByteArray get() = Build.VERSION.RELEASE.orEmpty().toByteArray()
+        override val codename: ByteArray get() = Build.VERSION.CODENAME.orEmpty().toByteArray()
         override val sdk: Int get() = Build.VERSION.SDK_INT
     }
 }