Add WXBizDataCrypt for WeChat Mini Program.

.gitignore

@@ -12,9 +12,9 @@ hs_err_pid*
 *~
 
 # eclipse ignore
-*.settings/*
-/.project
-/.classpath
+.settings/
+.project
+.classpath
 /.tomcatplugin
 
 # idea ignore
@@ -22,7 +22,7 @@ hs_err_pid*
 *.iml
 
 # maven ignore
-target/*
+target/
 
 # other ignore
 *.log

README.md

@@ -18,7 +18,11 @@ weixin4j
 * **weixin4j-qy[1.7.8]**
 
   `企业号API封装`
-  
+
+* **weixin4j-wxa[1.7.9]**
+
+  `小程序 API 封装`
+
 * **weixin4j-server[1.1.8]**
   
   `netty服务器&消息分发`

pom.xml

@@ -43,6 +43,7 @@
 		<module>weixin4j-base</module>
 		<module>weixin4j-mp</module>
 		<module>weixin4j-qy</module>
+		<module>weixin4j-wxa</module>
 		<module>weixin4j-server</module>
 		<module>weixin4j-example</module>
 		<module>weixin4j-serverX</module>

weixin4j-wxa/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>com.foxinmy</groupId>
+		<artifactId>weixin4j</artifactId>
+		<version>1.7.9</version>
+	</parent>
+	<artifactId>weixin4j-wxa</artifactId>
+	<name>weixin4j-wxa</name>
+	<url>https://github.com/foxinmy/weixin4j/tree/master/weixin4j-wxa</url>
+	<description>微信小程序 API 支持</description>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-assembly-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+	<dependencies>
+		<dependency>
+			<groupId>com.foxinmy</groupId>
+			<artifactId>weixin4j-base</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>commons-codec</groupId>
+			<artifactId>commons-codec</artifactId>
+			<version>1.10</version>
+		</dependency>
+		<dependency>
+			<groupId>org.bouncycastle</groupId>
+			<artifactId>bcprov-jdk15on</artifactId>
+			<version>1.55</version>
+		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>ch.qos.logback</groupId>
+			<artifactId>logback-core</artifactId>
+			<version>1.1.8</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+</project>

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/AESUtils.java

@@ -0,0 +1,58 @@
+package com.foxinmy.weixin4j.wxa;
+
+import java.security.AlgorithmParameters;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.Key;
+import java.security.NoSuchProviderException;
+import java.security.Security;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+
+final class AESUtils {
+
+	private static boolean initialized = false;
+
+	private AESUtils() {
+	}
+
+	/**
+	 * AES解密
+	 *
+	 * @param content 密文
+	 * @return 明文
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws NoSuchProviderException
+	 */
+	static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte)
+			throws InvalidAlgorithmParameterException {
+		initialize();
+		try {
+			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
+			Key sKeySpec = new SecretKeySpec(keyByte, "AES");
+
+			cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte)); // 初始化
+			byte[] result = cipher.doFinal(content);
+			return result;
+		} catch (Exception e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	private static void initialize() {
+		if (initialized)
+			return;
+		Security.addProvider(new BouncyCastleProvider());
+		initialized = true;
+	}
+
+	private static AlgorithmParameters generateIV(byte[] iv) throws Exception {
+		AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
+		params.init(new IvParameterSpec(iv));
+		return params;
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WXBizDataCrypt.java

@@ -0,0 +1,48 @@
+package com.foxinmy.weixin4j.wxa;
+
+import java.nio.charset.Charset;
+import java.security.InvalidAlgorithmParameterException;
+
+import org.apache.commons.codec.binary.Base64;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+
+/**
+ * @see <a href="https://developers.weixin.qq.com/miniprogram/dev/api/signature.html#wxchecksessionobject">加密数据解密算法</a>
+ */
+public class WXBizDataCrypt {
+
+	private final String appid;
+
+	private final String sessionKey;
+
+	public WXBizDataCrypt(String appid, String sessionKey) {
+		this.appid = appid;
+		this.sessionKey = sessionKey;
+	}
+
+	public JSONObject decryptData(final String encryptedData, final String iv) {
+		final byte[] aesKey = Base64.decodeBase64(sessionKey);
+		final byte[] aesCipher = Base64.decodeBase64(encryptedData);
+		final byte[] aesIV = Base64.decodeBase64(iv);
+
+		final byte[] resultByte;
+		try {
+			resultByte = AESUtils.decrypt(aesCipher, aesKey, aesIV);
+		} catch (InvalidAlgorithmParameterException e) {
+			throw new RuntimeException(e);
+		}
+
+		final String decryptedText = new String(resultByte, Charset.forName("UTF-8"));
+		final JSONObject decrypted = JSON.parseObject(decryptedText);
+
+		final String appId = decrypted.getJSONObject("watermark").getString("appid");
+		if (!appId.equals(this.appid)) {
+			throw new IllegalArgumentException("Invalid Buffer");
+		}
+
+		return decrypted;
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * <a href="https://developers.weixin.qq.com/miniprogram/dev/api/">WeChat Mini Program</a> support library.
+ */
+package com.foxinmy.weixin4j.wxa;

weixin4j-wxa/src/test/java/com/foxinmy/weixin4j/wxa/WXBizDataCryptTest.java

@@ -0,0 +1,55 @@
+package com.foxinmy.weixin4j.wxa;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import com.alibaba.fastjson.JSONObject;
+
+public class WXBizDataCryptTest {
+
+	@Test
+	public void testDecryptData() {
+		String appId = "wx4f4bc4dec97d474b";
+		String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
+
+		WXBizDataCrypt biz = new WXBizDataCrypt(appId, sessionKey);
+
+		String encryptedData
+			= "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM"
+			+ "QmRzooG2xrDcvSnxIMXFufNstNGTyaGS"
+			+ "9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+"
+			+ "3hVbJSRgv+4lGOETKUQz6OYStslQ142d"
+			+ "NCuabNPGBzlooOmB231qMM85d2/fV6Ch"
+			+ "evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6"
+			+ "/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw"
+			+ "u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn"
+			+ "/Hz7saL8xz+W//FRAUid1OksQaQx4CMs"
+			+ "8LOddcQhULW4ucetDf96JcR3g0gfRK4P"
+			+ "C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB"
+			+ "6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns"
+			+ "/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd"
+			+ "lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV"
+			+ "oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG"
+			+ "20f0a04COwfneQAGGwd5oa+T8yO5hzuy"
+			+ "Db/XcxxmK01EpqOyuxINew==";
+		String iv = "r7BXXKkLb8qrSNn05n0qiA==";
+
+		JSONObject data = biz.decryptData(encryptedData, iv);
+
+		assertEquals("CN", data.getString("country"));
+		assertEquals("ocMvos6NjeKLIBqg5Mr9QjxrP1FA", data.getString("unionId"));
+		assertEquals(1, data.getIntValue("gender"));
+		assertEquals("Guangdong", data.getString("province"));
+		assertEquals("Guangzhou", data.getString("city"));
+		assertEquals("http://wx.qlogo.cn/mmopen/vi_32/aSKcBBPpibyKNicHNTMM0qJVh8Kjgiak2AHWr8MHM4WgMEm7GFhsf8OYrySdbvAMvTsw3mo8ibKicsnfN5pRjl1p8HQ/0", data.getString("avatarUrl"));
+		assertEquals("oGZUI0egBJY1zhBYw2KhdUfwVJJE", data.getString("openId"));
+		assertEquals("Band", data.getString("nickName"));
+		assertEquals("zh_CN", data.getString("language"));
+
+		JSONObject watermark = data.getJSONObject("watermark");
+		assertEquals("wx4f4bc4dec97d474b", watermark.getString("appid"));
+		assertEquals(1477314187L, watermark.getLongValue("timestamp"));
+	}
+
+}