feat(device): 添加画布指纹功能

- 实现了画布指纹功能，用于设备识别
- 画布指纹基于不同设备的硬件和浏览器实现差异
- 新增 getCanvasFingerprint 方法获取画布指纹
- 更新了相关文件以支持新功能

Author: liyujiang-gzu

CHANGELOG.md

@@ -1,5 +1,9 @@
 # 更新日志
 
+## 4.2.12 - 2025/03/02
+
+- 增加画布指纹（原理：不同设备的硬件以及浏览器实现会导致画布渲染结果存在细微差异。）。
+
 ## 4.2.11 - 2024/12/01
 
 - 阿里云 Maven 仓库问题。

README.md

@@ -17,8 +17,6 @@
 - 码云(GitEE)：`https://gitee.com/li_yu_jiang/Android_CN_OAID`
 - Demo：[https://github.com/gzu-liyujiang/Android_CN_OAID/blob/master/demo.apk](/demo.apk)
 
-【抱歉！各位小伙伴，从2022年开始我已经没做安卓开发了，项目虽然已经趋于稳定，不过需要大家参与维护，多提PullRequest，我目前已经没法贡献代码了】
-
 ## 接入指引
 
 最新版本：[![jitpack](https://jitpack.io/v/gzu-liyujiang/Android_CN_OAID.svg)](https://jitpack.io/#gzu-liyujiang/Android_CN_OAID)
@@ -143,6 +141,8 @@ dependencies {
                 // 获取OAID/AAID失败
             }
         });
+        // 获取画布指纹
+        DeviceIdentifier.getCanvasFingerprint();
 ```
 
 ## 混淆规则

app/src/main/java/com/github/gzuliyujiang/fallback/MainActivity.java

@@ -117,17 +117,21 @@ private void obtainDeviceId() {
             @Override
             public void onOAIDGetComplete(String result) {
                 // 不同厂商的OAID/AAID格式是不一样的，可进行MD5、SHA1之类的哈希运算统一
-                builder.append("OAID/AAID: ").append(result);
+                builder.append("OAID/AAID: ").append(result).append("\n");
                 tvDeviceIdResult.setText(builder);
             }
 
             @Override
             public void onOAIDGetError(Exception error) {
                 // 获取OAID/AAID失败
-                builder.append("OAID/AAID: ").append(error);
+                builder.append("OAID/AAID: ").append(error).append("\n");
                 tvDeviceIdResult.setText(builder);
             }
         });
+        builder.append("CanvasFingerprint: ");
+        // 获取帆布指纹，不会为空，具有一定的唯一性，但不能完全保证全球唯一。
+        builder.append(DeviceIdentifier.getCanvasFingerprint());
+        builder.append("\n");
     }
 
     private String obtainDeviceInfo() {

gradle/wrapper/gradle-wrapper.properties

@@ -14,7 +14,7 @@
 #Sun Dec 01 12:12:49 CST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-#distributionUrl=file:///G:/\u540C\u6B65\u7A7A\u95F4/\u7F16\u7A0B/\u5F00\u53D1\u5DE5\u5177/gradle-8.9-bin.zip
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+#distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://mirrors.nju.edu.cn/gradle/gradle-8.9-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

library/src/main/java/com/github/gzuliyujiang/oaid/DeviceID.java

@@ -18,6 +18,11 @@
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Typeface;
 import android.media.MediaDrm;
 import android.os.Build;
 import android.os.Environment;
@@ -516,6 +521,29 @@ public static String calculateHash(String str, String algorithm) {
         }
     }
 
+    /**
+     * 获取画布指纹。原理：不同设备的硬件以及浏览器实现会导致画布渲染结果存在细微差异。
+     */
+    public static String getCanvasFingerprint() {
+        int width = 200;
+        int height = 100;
+        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+        canvas.drawColor(Color.WHITE);
+        Paint paint = new Paint();
+        paint.setColor(Color.BLACK);
+        paint.setTextSize(18);
+        paint.setTypeface(Typeface.SERIF);
+        canvas.drawText("羡民@李裕江", 10, 50, paint);
+        int[] pixels = new int[width * height];
+        bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
+        StringBuilder pixelData = new StringBuilder();
+        for (int pixel : pixels) {
+            pixelData.append(pixel);
+        }
+        return calculateHash(pixelData.toString(), "SHA-1");
+    }
+
     private static class Holder {
         static final DeviceID INSTANCE = new DeviceID();
     }

library/src/main/java/com/github/gzuliyujiang/oaid/DeviceIdentifier.java

@@ -35,6 +35,7 @@ public final class DeviceIdentifier {
     private static volatile String widevineId = null;
     private static volatile String pseudoId = null;
     private static volatile String guid = null;
+    private static volatile String canvasFingerprint = null;
 
     private DeviceIdentifier() {
         super();
@@ -274,4 +275,21 @@ public static String getGUID(Context context) {
         return guid;
     }
 
+    /**
+     * 获取画布指纹。具有一定的唯一性，但不能完全保证全球唯一。
+     */
+    public static String getCanvasFingerprint() {
+        if (canvasFingerprint == null) {
+            synchronized (DeviceIdentifier.class) {
+                if (canvasFingerprint == null) {
+                    canvasFingerprint = DeviceID.getCanvasFingerprint();
+                }
+            }
+        }
+        if (canvasFingerprint == null) {
+            canvasFingerprint = "";
+        }
+        return canvasFingerprint;
+    }
+
 }