Cleanup utils

src/main/java/org/asamk/signal/manager/DeviceLinkInfo.java

@@ -0,0 +1,60 @@
+package org.asamk.signal.manager;
+
+import org.whispersystems.libsignal.InvalidKeyException;
+import org.whispersystems.libsignal.ecc.Curve;
+import org.whispersystems.libsignal.ecc.ECPublicKey;
+import org.whispersystems.util.Base64;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URLDecoder;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.whispersystems.signalservice.internal.util.Util.isEmpty;
+
+public class DeviceLinkInfo {
+
+    final String deviceIdentifier;
+    final ECPublicKey deviceKey;
+
+    public static DeviceLinkInfo parseDeviceLinkUri(URI linkUri) throws IOException, InvalidKeyException {
+        Map<String, String> query = getQueryMap(linkUri.getRawQuery());
+        String deviceIdentifier = query.get("uuid");
+        String publicKeyEncoded = query.get("pub_key");
+
+        if (isEmpty(deviceIdentifier) || isEmpty(publicKeyEncoded)) {
+            throw new RuntimeException("Invalid device link uri");
+        }
+
+        ECPublicKey deviceKey = Curve.decodePoint(Base64.decode(publicKeyEncoded), 0);
+
+        return new DeviceLinkInfo(deviceIdentifier, deviceKey);
+    }
+
+    private static Map<String, String> getQueryMap(String query) {
+        String[] params = query.split("&");
+        Map<String, String> map = new HashMap<>();
+        for (String param : params) {
+            final String[] paramParts = param.split("=");
+            String name = URLDecoder.decode(paramParts[0], StandardCharsets.UTF_8);
+            String value = URLDecoder.decode(paramParts[1], StandardCharsets.UTF_8);
+            map.put(name, value);
+        }
+        return map;
+    }
+
+    public DeviceLinkInfo(final String deviceIdentifier, final ECPublicKey deviceKey) {
+        this.deviceIdentifier = deviceIdentifier;
+        this.deviceKey = deviceKey;
+    }
+
+    public String createDeviceLinkUri() {
+        return "tsdevice:/?uuid="
+                + URLEncoder.encode(deviceIdentifier, StandardCharsets.UTF_8)
+                + "&pub_key="
+                + URLEncoder.encode(Base64.encodeBytesWithoutPadding(deviceKey.serialize()), StandardCharsets.UTF_8);
+    }
+}