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
   7 import java.net.URI;
   8 import java.net.URLDecoder;
   9 import java.net.URLEncoder;
  10 import java.nio.charset.StandardCharsets;
  11 import java.util.Base64;
  12 import java.util.HashMap;
  13 import java.util.Map;
  14
  15 import static org.whispersystems.signalservice.internal.util.Util.isEmpty;
  16
  17 public class DeviceLinkInfo {
  18
  19     final String deviceIdentifier;
  20     final ECPublicKey deviceKey;
  21
  22     public static DeviceLinkInfo parseDeviceLinkUri(URI linkUri) throws InvalidKeyException {
  23         final String rawQuery = linkUri.getRawQuery();
  24         if (isEmpty(rawQuery)) {
  25             throw new RuntimeException("Invalid device link uri");
  26         }
  27
  28         Map<String, String> query = getQueryMap(rawQuery);
  29         String deviceIdentifier = query.get("uuid");
  30         String publicKeyEncoded = query.get("pub_key");
  31
  32         if (isEmpty(deviceIdentifier) || isEmpty(publicKeyEncoded)) {
  33             throw new RuntimeException("Invalid device link uri");
  34         }
  35
  36         final byte[] publicKeyBytes;
  37         try {
  38             publicKeyBytes = Base64.getDecoder().decode(publicKeyEncoded);
  39         } catch (IllegalArgumentException e) {
  40             throw new RuntimeException("Invalid device link uri", e);
  41         }
  42         ECPublicKey deviceKey = Curve.decodePoint(publicKeyBytes, 0);
  43
  44         return new DeviceLinkInfo(deviceIdentifier, deviceKey);
  45     }
  46
  47     private static Map<String, String> getQueryMap(String query) {
  48         String[] params = query.split("&");
  49         Map<String, String> map = new HashMap<>();
  50         for (String param : params) {
  51             final String[] paramParts = param.split("=");
  52             String name = URLDecoder.decode(paramParts[0], StandardCharsets.UTF_8);
  53             String value = URLDecoder.decode(paramParts[1], StandardCharsets.UTF_8);
  54             map.put(name, value);
  55         }
  56         return map;
  57     }
  58
  59     public DeviceLinkInfo(final String deviceIdentifier, final ECPublicKey deviceKey) {
  60         this.deviceIdentifier = deviceIdentifier;
  61         this.deviceKey = deviceKey;
  62     }
  63
  64     public String createDeviceLinkUri() {
  65         final String deviceKeyString = Base64.getEncoder().encodeToString(deviceKey.serialize()).replace("=", "");
  66         return "tsdevice:/?uuid="
  67                 + URLEncoder.encode(deviceIdentifier, StandardCharsets.UTF_8)
  68                 + "&pub_key="
  69                 + URLEncoder.encode(deviceKeyString, StandardCharsets.UTF_8);
  70     }
  71 }