nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/manager/DeviceLinkInfo.java

   1 package org.asamk.signal.manager;
   2
   3 import org.whispersystems.libsignal.InvalidKeyException;
   4 import org.whispersystems.libsignal.ecc.Curve;
   5 import org.whispersystems.libsignal.ecc.ECPublicKey;
   6 import org.whispersystems.util.Base64;
   7
   8 import java.io.IOException;
   9 import java.net.URI;
  10 import java.net.URLDecoder;
  11 import java.net.URLEncoder;
  12 import java.nio.charset.StandardCharsets;
  13 import java.util.HashMap;
  14 import java.util.Map;
  15
  16 import static org.whispersystems.signalservice.internal.util.Util.isEmpty;
  17
  18 public class DeviceLinkInfo {
  19
  20     final String deviceIdentifier;
  21     final ECPublicKey deviceKey;
  22
  23     public static DeviceLinkInfo parseDeviceLinkUri(URI linkUri) throws IOException, InvalidKeyException {
  24         final String rawQuery = linkUri.getRawQuery();
  25         if (isEmpty(rawQuery)) {
  26             throw new RuntimeException("Invalid device link uri");
  27         }
  28
  29         Map<String, String> query = getQueryMap(rawQuery);
  30         String deviceIdentifier = query.get("uuid");
  31         String publicKeyEncoded = query.get("pub_key");
  32
  33         if (isEmpty(deviceIdentifier) || isEmpty(publicKeyEncoded)) {
  34             throw new RuntimeException("Invalid device link uri");
  35         }
  36
  37         ECPublicKey deviceKey = Curve.decodePoint(Base64.decode(publicKeyEncoded), 0);
  38
  39         return new DeviceLinkInfo(deviceIdentifier, deviceKey);
  40     }
  41
  42     private static Map<String, String> getQueryMap(String query) {
  43         String[] params = query.split("&");
  44         Map<String, String> map = new HashMap<>();
  45         for (String param : params) {
  46             final String[] paramParts = param.split("=");
  47             String name = URLDecoder.decode(paramParts[0], StandardCharsets.UTF_8);
  48             String value = URLDecoder.decode(paramParts[1], StandardCharsets.UTF_8);
  49             map.put(name, value);
  50         }
  51         return map;
  52     }
  53
  54     public DeviceLinkInfo(final String deviceIdentifier, final ECPublicKey deviceKey) {
  55         this.deviceIdentifier = deviceIdentifier;
  56         this.deviceKey = deviceKey;
  57     }
  58
  59     public String createDeviceLinkUri() {
  60         return "tsdevice:/?uuid="
  61                 + URLEncoder.encode(deviceIdentifier, StandardCharsets.UTF_8)
  62                 + "&pub_key="
  63                 + URLEncoder.encode(Base64.encodeBytesWithoutPadding(deviceKey.serialize()), StandardCharsets.UTF_8);
  64     }
  65 }