Adds Java code

.gitignore

@@ -1 +1,4 @@
-library.zip
+haxe-build.zip
+build/
+
+*.jar

SPEC.md

@@ -69,7 +69,7 @@ Note the extra space.
 ##### Encoded Base64
 
 ```text
-7+NGHfxDoqjXjk6iU0U6yTYhjWktxVe6eijj+9Nf36VYpzgIb+qIzxS6VSukYt6ANFCzuM6mZ4AO9oO4FFDAVw==
+dbhvecY6Roa4NF3gAzEbkTibZZzXAEYpMg8197BQWMS2+ID24FGDKWB5IEcuxjsA81ChprhSO3EsjKMRDbBWLg==
 ```
 
 See the recipe on [CyberChef][cyberchef].

release.sh

@@ -1,4 +1,10 @@
 #!/bin/sh
-rm -f library.zip
-zip -r library.zip src LICENSE *.md *.json *.hxml
-haxelib submit library.zip $(pass show Dev/lib.haxe.org) --always
+# Haxe
+rm -f haxe-build.zip
+zip -r haxe-build.zip src LICENSE *.md *.json *.hxml
+haxelib submit haxe-build.zip $(pass show Dev/lib.haxe.org) --always
+rm -f haxe-build.zip
+
+# Java
+javac -cp src src/eci/*.java -d build/
+jar -cf epicqr-release.jar build/*

src/eci/EpicQR.hx

@@ -13,7 +13,7 @@ class EpicQR{
     // public static inline var SALT:String  = "FSwI.qT";
 
     public static inline var IV:String  = "H76$suq23_po(8sD";
-    public static inline var KEY:String = "X_4k$uq23FSwI.qT"; // KEY+SALT
+    public static inline var KEY:String = "X_4k$uq23FSwI.qT"; // KEY_PREFIX + SALT
 
     static function decode(input:String){
         var cipherText:Bytes = Base64.decode(input);

src/eci/EpicQR.java

@@ -0,0 +1,54 @@
+package eci;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import javax.crypto.*;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+import java.security.NoSuchAlgorithmException;
+import java.security.InvalidKeyException;
+import java.security.InvalidAlgorithmParameterException;
+import javax.crypto.NoSuchPaddingException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+
+public class EpicQR {
+    // static String KEY_SEED = "tHzHtCcDd3V6p_9dOnse|_SX_4k$uq23.qT.L.(MgyJ7UH4n921J6UlKeck_S0Jl2znUY8CiMKyklWf2";
+    // static String KEY_PREFIX = "X_4k$uq23"; // SUBSTR(KEY_SEED, 23, 32)
+    // static String SALT = "FSwI.qT";
+    static String IV = "H76$suq23_po(8sD";
+    static String KEY = "X_4k$uq23FSwI.qT"; // KEY_PREFIX + SALT
+
+    private static SecretKeySpec getKey() {
+        return new SecretKeySpec(KEY.getBytes(StandardCharsets.UTF_8), "AES");
+    }
+
+    private static Cipher getCipher() throws NoSuchAlgorithmException, InvalidKeyException,NoSuchPaddingException,InvalidAlgorithmParameterException {
+        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
+        cipher.init(Cipher.DECRYPT_MODE, getKey(), new IvParameterSpec(IV.getBytes()));
+        return cipher;    
+    }
+
+    public static Result decode(String input) {
+        try {
+            byte[] decryptedBytes = getCipher().doFinal(Base64.getDecoder().decode(input));
+            String j = new String(decryptedBytes);
+            return extractValue(j, "epic_no", "unique_generated_id");
+        } catch (Exception exception) {
+            throw new RuntimeException("Failed to decode", exception);
+        }
+    }
+
+    private static Result extractValue(String jsonString, String k1, String k2) {
+        final String regex = "\\{\\\"epic_no\\\":\\\"([A-Z]{3}\\d{7})\\\",\\\"unique_generated_id\\\":(\\d+)\\}";
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(jsonString);
+
+        if (matcher.find()) {
+            return new Result(matcher.group(1), Integer.parseInt(matcher.group(2)));
+        } else {
+            throw new RuntimeException("Failed to parse JSON");
+        }
+    }
+}

src/eci/Result.hx

@@ -2,9 +2,9 @@ package eci;
 
 class Result {
     public var epic:String;
-    public var id:String;
+    public var id:Int;
 
-    public function new(epic: String, id: String) {
+    public function new(epic: String, id: Int) {
         this.epic  = epic;
         this.id = id;
     }

src/eci/Result.java

@@ -0,0 +1,12 @@
+package eci;
+
+public class Result{
+	public String epic;
+	public int id;
+
+	// constructor
+	public Result(String epic, int id){
+		this.epic = epic;
+		this.id = id;
+	}
+}

test.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+## Tests for Java
+javac -cp src/ test/Test.java
+java -enableassertions -cp src:test Test

test/Test.java

@@ -0,0 +1,11 @@
+import eci.Result;
+import eci.EpicQR;
+
+public class Test {
+    public static void main(String[] args) {
+        String e1 = "dbhvecY6Roa4NF3gAzEbkTibZZzXAEYpMg8197BQWMS2+ID24FGDKWB5IEcuxjsA81ChprhSO3EsjKMRDbBWLg==";
+        Result r1 = EpicQR.decode(e1);
+        assert r1.epic.equals("ABC1234566") : "Invalid EPIC";
+        assert r1.id == 1234 :  "Invalid Unique ID";
+    }
+}

test/fixture.json

@@ -0,0 +1,4 @@
+{
+	"input": "{\"epic_no\":\"ABC1234566\",\"unique_generated_id\":1234}",
+	"output": "dbhvecY6Roa4NF3gAzEbkTibZZzXAEYpMg8197BQWMS2+ID24FGDKWB5IEcuxjsA81ChprhSO3EsjKMRDbBWLg=="
+}