global: get rid of nonnull gradle hack

Hacking things up via gradle is not right, and package-info.java poses
problems with two modules, so instead we just apply it manually to every
class.

Remember to add this to new classes!

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

24 files changed, 70 insertions, 0 deletions

diff --git a/tunnel/src/main/java/com/wireguard/android/backend/Backend.java b/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
index ed3a5ebd..853802d2 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
 import com.wireguard.config.Config;
 
 import java.util.Collection;
@@ -16,6 +18,7 @@ import androidx.annotation.Nullable;
  * Interface for implementations of the WireGuard secure network tunnel.
  */
 
+@NonNullForAll
 public interface Backend {
     /**
      * Enumerate names of currently-running tunnels.
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/BackendException.java b/tunnel/src/main/java/com/wireguard/android/backend/BackendException.java
index e1e8eaa9..0f60701b 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/BackendException.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/BackendException.java
@@ -5,6 +5,9 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
+@NonNullForAll
 public final class BackendException extends Exception {
     public enum Reason {
         UNKNOWN_KERNEL_MODULE_NAME,
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
index 6ad5afa4..bf434cf5 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
@@ -30,6 +32,7 @@ import java.util.concurrent.TimeoutException;
 
 import java9.util.concurrent.CompletableFuture;
 
+@NonNullForAll
 public final class GoBackend implements Backend {
     private static final String TAG = "WireGuard/" + GoBackend.class.getSimpleName();
     private static CompletableFuture<VpnService> vpnService = new CompletableFuture<>();
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/Statistics.java b/tunnel/src/main/java/com/wireguard/android/backend/Statistics.java
index 2ca87d23..f878a1f0 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/Statistics.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/Statistics.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.os.SystemClock;
 import android.util.Pair;
 
@@ -13,6 +15,7 @@ import com.wireguard.crypto.Key;
 import java.util.HashMap;
 import java.util.Map;
 
+@NonNullForAll
 public class Statistics {
     private long lastTouched = SystemClock.elapsedRealtime();
     private final Map<Key, Pair<Long, Long>> peerBytes = new HashMap<>();
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/Tunnel.java b/tunnel/src/main/java/com/wireguard/android/backend/Tunnel.java
index af2f59f7..fccda84f 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/Tunnel.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/Tunnel.java
@@ -5,12 +5,15 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
 import java.util.regex.Pattern;
 
 /**
  * Represents a WireGuard tunnel.
  */
 
+@NonNullForAll
 public interface Tunnel {
     enum State {
         DOWN,
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
index 53fe3d42..c4434e4d 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.backend;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import android.content.Context;
@@ -39,6 +41,7 @@ import java9.util.stream.Stream;
  * WireGuard backend that uses {@code wg-quick} to implement tunnel configuration.
  */
 
+@NonNullForAll
 public final class WgQuickBackend implements Backend {
     private static final String TAG = "WireGuard/" + WgQuickBackend.class.getSimpleName();
 
diff --git a/tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java b/tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java
index f09d9a87..40645a43 100644
--- a/tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java
+++ b/tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import android.system.OsConstants;
 import android.util.Base64;
@@ -36,6 +38,7 @@ import java.util.Map;
 
 import androidx.annotation.Nullable;
 
+@NonNullForAll
 public class ModuleLoader {
     private static final String MODULE_PUBLIC_KEY_BASE64 = "RWRmHuT9PSqtwfsLtEx+QS06BJtLgFYteL9WCNjH7yuyu5Y1DieSN7If";
     private static final String MODULE_LIST_URL = "https://download.wireguard.com/android-module/modules.txt.sig";
diff --git a/tunnel/src/main/java/com/wireguard/android/util/RootShell.java b/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
index 1fc2c9f2..eccc61cb 100644
--- a/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
+++ b/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import androidx.annotation.Nullable;
 import android.util.Log;
@@ -24,6 +26,7 @@ import java.util.UUID;
  * Helper class for running commands as root.
  */
 
+@NonNullForAll
 public class RootShell {
     private static final String SU = "su";
     private static final String TAG = "WireGuard/" + RootShell.class.getSimpleName();
diff --git a/tunnel/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java b/tunnel/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java
index 93e44b64..3c2448fe 100644
--- a/tunnel/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java
+++ b/tunnel/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import android.os.Build;
 import android.util.Log;
@@ -19,6 +21,7 @@ import java.util.HashSet;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
+@NonNullForAll
 public final class SharedLibraryLoader {
     private static final String TAG = "WireGuard/" + SharedLibraryLoader.class.getSimpleName();
 
diff --git a/tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java b/tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java
index ac18cabf..1ce3fe80 100644
--- a/tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java
+++ b/tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import androidx.annotation.Nullable;
 import android.system.OsConstants;
@@ -22,6 +24,7 @@ import java.util.List;
  * Helper to install WireGuard tools to the system partition.
  */
 
+@NonNullForAll
 public final class ToolsInstaller {
     public static final int ERROR = 0x0;
     public static final int MAGISK = 0x4;
diff --git a/tunnel/src/main/java/com/wireguard/config/Attribute.java b/tunnel/src/main/java/com/wireguard/config/Attribute.java
index 1e9e25f0..659f7cf4 100644
--- a/tunnel/src/main/java/com/wireguard/config/Attribute.java
+++ b/tunnel/src/main/java/com/wireguard/config/Attribute.java
@@ -5,12 +5,15 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import java.util.Iterator;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import java9.util.Optional;
 
+@NonNullForAll
 public final class Attribute {
     private static final Pattern LINE_PATTERN = Pattern.compile("(\\w+)\\s*=\\s*([^\\s#][^#]*)");
     private static final Pattern LIST_SEPARATOR = Pattern.compile("\\s*,\\s*");
diff --git a/tunnel/src/main/java/com/wireguard/config/BadConfigException.java b/tunnel/src/main/java/com/wireguard/config/BadConfigException.java
index 6d41b065..89b3af2c 100644
--- a/tunnel/src/main/java/com/wireguard/config/BadConfigException.java
+++ b/tunnel/src/main/java/com/wireguard/config/BadConfigException.java
@@ -5,10 +5,13 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import com.wireguard.crypto.KeyFormatException;
 
+@NonNullForAll
 public class BadConfigException extends Exception {
     private final Location location;
     private final Reason reason;
diff --git a/tunnel/src/main/java/com/wireguard/config/Config.java b/tunnel/src/main/java/com/wireguard/config/Config.java
index 62651b08..f86eb6fd 100644
--- a/tunnel/src/main/java/com/wireguard/config/Config.java
+++ b/tunnel/src/main/java/com/wireguard/config/Config.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import com.wireguard.config.BadConfigException.Location;
@@ -29,6 +31,7 @@ import java.util.Set;
  * <p>
  * Instances of this class are immutable.
  */
+@NonNullForAll
 public final class Config {
     private final Interface interfaze;
     private final List<Peer> peers;
diff --git a/tunnel/src/main/java/com/wireguard/config/InetAddresses.java b/tunnel/src/main/java/com/wireguard/config/InetAddresses.java
index 1479b5ff..9b0ab965 100644
--- a/tunnel/src/main/java/com/wireguard/config/InetAddresses.java
+++ b/tunnel/src/main/java/com/wireguard/config/InetAddresses.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import java.lang.reflect.Method;
 import java.net.Inet4Address;
 import java.net.Inet6Address;
@@ -17,6 +19,7 @@ import androidx.annotation.Nullable;
 /**
  * Utility methods for creating instances of {@link InetAddress}.
  */
+@NonNullForAll
 public final class InetAddresses {
     @Nullable private static final Method PARSER_METHOD;
     private static final Pattern WONT_TOUCH_RESOLVER = Pattern.compile("^(((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:)))(%.+)?)|((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))$");
diff --git a/tunnel/src/main/java/com/wireguard/config/InetEndpoint.java b/tunnel/src/main/java/com/wireguard/config/InetEndpoint.java
index a442258e..69c60806 100644
--- a/tunnel/src/main/java/com/wireguard/config/InetEndpoint.java
+++ b/tunnel/src/main/java/com/wireguard/config/InetEndpoint.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import org.threeten.bp.Duration;
@@ -25,6 +27,7 @@ import java9.util.Optional;
  * <p>
  * Instances of this class are externally immutable.
  */
+@NonNullForAll
 public final class InetEndpoint {
     private static final Pattern BARE_IPV6 = Pattern.compile("^[^\\[\\]]*:[^\\[\\]]*");
     private static final Pattern FORBIDDEN_CHARACTERS = Pattern.compile("[/?#]");
diff --git a/tunnel/src/main/java/com/wireguard/config/InetNetwork.java b/tunnel/src/main/java/com/wireguard/config/InetNetwork.java
index f89322fd..0c993fc8 100644
--- a/tunnel/src/main/java/com/wireguard/config/InetNetwork.java
+++ b/tunnel/src/main/java/com/wireguard/config/InetNetwork.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import java.net.Inet4Address;
 import java.net.InetAddress;
 
@@ -13,6 +15,7 @@ import java.net.InetAddress;
  * <p>
  * Instances of this class are immutable.
  */
+@NonNullForAll
 public final class InetNetwork {
     private final InetAddress address;
     private final int mask;
diff --git a/tunnel/src/main/java/com/wireguard/config/Interface.java b/tunnel/src/main/java/com/wireguard/config/Interface.java
index 54944424..efe00ce7 100644
--- a/tunnel/src/main/java/com/wireguard/config/Interface.java
+++ b/tunnel/src/main/java/com/wireguard/config/Interface.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import com.wireguard.config.BadConfigException.Location;
@@ -35,6 +37,7 @@ import java9.util.stream.StreamSupport;
  * <p>
  * Instances of this class are immutable.
  */
+@NonNullForAll
 public final class Interface {
     private static final int MAX_UDP_PORT = 65535;
     private static final int MIN_UDP_PORT = 0;
diff --git a/tunnel/src/main/java/com/wireguard/config/ParseException.java b/tunnel/src/main/java/com/wireguard/config/ParseException.java
index c79d1fa1..f4da7ccd 100644
--- a/tunnel/src/main/java/com/wireguard/config/ParseException.java
+++ b/tunnel/src/main/java/com/wireguard/config/ParseException.java
@@ -5,10 +5,13 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 /**
  */
+@NonNullForAll
 public class ParseException extends Exception {
     private final Class<?> parsingClass;
     private final CharSequence text;
diff --git a/tunnel/src/main/java/com/wireguard/config/Peer.java b/tunnel/src/main/java/com/wireguard/config/Peer.java
index 37fcfa69..ef91a306 100644
--- a/tunnel/src/main/java/com/wireguard/config/Peer.java
+++ b/tunnel/src/main/java/com/wireguard/config/Peer.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.config;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import com.wireguard.config.BadConfigException.Location;
@@ -28,6 +30,7 @@ import java9.util.Optional;
  * <p>
  * Instances of this class are immutable.
  */
+@NonNullForAll
 public final class Peer {
     private final Set<InetNetwork> allowedIps;
     private final Optional<InetEndpoint> endpoint;
diff --git a/tunnel/src/main/java/com/wireguard/crypto/Curve25519.java b/tunnel/src/main/java/com/wireguard/crypto/Curve25519.java
index 5622fc5f..7628c566 100644
--- a/tunnel/src/main/java/com/wireguard/crypto/Curve25519.java
+++ b/tunnel/src/main/java/com/wireguard/crypto/Curve25519.java
@@ -6,6 +6,8 @@
 
 package com.wireguard.crypto;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import java.util.Arrays;
@@ -25,6 +27,7 @@ import java.util.Arrays;
  * References: http://cr.yp.to/ecdh.html, RFC 7748
  */
 @SuppressWarnings({"MagicNumber", "NonConstantFieldWithUpperCaseName", "SuspiciousNameCombination"})
+@NonNullForAll
 public final class Curve25519 {
     // Numbers modulo 2^255 - 19 are broken up into ten 26-bit words.
     private static final int NUM_LIMBS_255BIT = 10;
diff --git a/tunnel/src/main/java/com/wireguard/crypto/Key.java b/tunnel/src/main/java/com/wireguard/crypto/Key.java
index 6648a5f3..e46150bd 100644
--- a/tunnel/src/main/java/com/wireguard/crypto/Key.java
+++ b/tunnel/src/main/java/com/wireguard/crypto/Key.java
@@ -5,6 +5,8 @@
 
 package com.wireguard.crypto;
 
+import com.wireguard.util.NonNullForAll;
+
 import com.wireguard.crypto.KeyFormatException.Type;
 
 import java.security.MessageDigest;
@@ -18,6 +20,7 @@ import java.util.Arrays;
  * Instances of this class are immutable.
  */
 @SuppressWarnings("MagicNumber")
+@NonNullForAll
 public final class Key {
     private final byte[] key;
 
diff --git a/tunnel/src/main/java/com/wireguard/crypto/KeyFormatException.java b/tunnel/src/main/java/com/wireguard/crypto/KeyFormatException.java
index 5818b4d4..8608fc36 100644
--- a/tunnel/src/main/java/com/wireguard/crypto/KeyFormatException.java
+++ b/tunnel/src/main/java/com/wireguard/crypto/KeyFormatException.java
@@ -5,11 +5,14 @@
 
 package com.wireguard.crypto;
 
+import com.wireguard.util.NonNullForAll;
+
 /**
  * An exception thrown when attempting to parse an invalid key (too short, too long, or byte
  * data inappropriate for the format). The format being parsed can be accessed with the
  * {@link #getFormat} method.
  */
+@NonNullForAll
 public final class KeyFormatException extends Exception {
     private final Key.Format format;
     private final Type type;
diff --git a/tunnel/src/main/java/com/wireguard/crypto/KeyPair.java b/tunnel/src/main/java/com/wireguard/crypto/KeyPair.java
index f8238e91..22c21734 100644
--- a/tunnel/src/main/java/com/wireguard/crypto/KeyPair.java
+++ b/tunnel/src/main/java/com/wireguard/crypto/KeyPair.java
@@ -5,11 +5,14 @@
 
 package com.wireguard.crypto;
 
+import com.wireguard.util.NonNullForAll;
+
 /**
  * Represents a Curve25519 key pair as used by WireGuard.
  * <p>
  * Instances of this class are immutable.
  */
+@NonNullForAll
 public class KeyPair {
     private final Key privateKey;
     private final Key publicKey;
diff --git a/tunnel/src/main/java/com/wireguard/util/NonNullForAll.java b/tunnel/src/main/java/com/wireguard/util/NonNullForAll.java
index f179fa49..2c2d9400 100644
--- a/tunnel/src/main/java/com/wireguard/util/NonNullForAll.java
+++ b/tunnel/src/main/java/com/wireguard/util/NonNullForAll.java
@@ -22,5 +22,6 @@ import javax.annotation.meta.TypeQualifierDefault;
 @Nonnull
 @TypeQualifierDefault({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
+
 public @interface NonNullForAll {
 }