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