From e12f99ab493e905f7bf8e09b257c6be007b98fb1 Mon Sep 17 00:00:00 2001
From: Ivan Hetman <Ihromant@users.noreply.github.com>
Date: Wed, 7 Dec 2022 13:33:27 +0200
Subject: [PATCH] Crypto/UUID (#639)

JS: if possible, use crypto API to generate UUID
---
 .../org/teavm/classlib/java/util/TUUID.java   | 12 +++--
 .../java/org/teavm/jso/crypto/Crypto.java     | 47 +++++++++++++++++++
 2 files changed, 56 insertions(+), 3 deletions(-)
 create mode 100644 jso/apis/src/main/java/org/teavm/jso/crypto/Crypto.java

diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TUUID.java b/classlib/src/main/java/org/teavm/classlib/java/util/TUUID.java
index 1ed20453b..ac80daf0b 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TUUID.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TUUID.java
@@ -15,8 +15,10 @@
  */
 package org.teavm.classlib.java.util;
 
-public class TUUID {
+import org.teavm.classlib.PlatformDetector;
+import org.teavm.jso.crypto.Crypto;
 
+public class TUUID {
     private String value;
 
     private TUUID(String value) {
@@ -44,8 +46,12 @@ public class TUUID {
     }
 
     public static TUUID randomUUID() {
-        String value = s4() + s4() + "-" + s4() + "-" + s4() + "-" + s4() + "-" + s4() + s4() + s4();
-        return new TUUID(value);
+        if (PlatformDetector.isJavaScript() && Crypto.isSupported()) {
+            return new TUUID(Crypto.current().randomUUID());
+        } else {
+            String value = s4() + s4() + "-" + s4() + "-" + s4() + "-" + s4() + "-" + s4() + s4() + s4();
+            return new TUUID(value);
+        }
     }
 
     private static String s4() {
diff --git a/jso/apis/src/main/java/org/teavm/jso/crypto/Crypto.java b/jso/apis/src/main/java/org/teavm/jso/crypto/Crypto.java
new file mode 100644
index 000000000..d32cadfbd
--- /dev/null
+++ b/jso/apis/src/main/java/org/teavm/jso/crypto/Crypto.java
@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2022 ihromant.
+ *
+ *  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 org.teavm.jso.crypto;
+
+import org.teavm.jso.JSBody;
+import org.teavm.jso.JSObject;
+import org.teavm.jso.typedarrays.Int16Array;
+import org.teavm.jso.typedarrays.Int32Array;
+import org.teavm.jso.typedarrays.Int8Array;
+import org.teavm.jso.typedarrays.Uint16Array;
+import org.teavm.jso.typedarrays.Uint8Array;
+import org.teavm.jso.typedarrays.Uint8ClampedArray;
+
+public abstract class Crypto implements JSObject {
+    @JSBody(script = "return window.crypto != null;")
+    public static native boolean isSupported();
+
+    @JSBody(script = "return window.crypto;")
+    public static native Crypto current();
+
+    public abstract String randomUUID();
+
+    public abstract void getRandomValues(Int8Array arr);
+
+    public abstract void getRandomValues(Uint8Array arr);
+
+    public abstract void getRandomValues(Uint8ClampedArray arr);
+
+    public abstract void getRandomValues(Int16Array arr);
+
+    public abstract void getRandomValues(Uint16Array arr);
+
+    public abstract void getRandomValues(Int32Array arr);
+}