public OAuthUserInfo getUserInfo()

in src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java [75:119]
38 lines of code
13 McCabe index (conditional complexity)

  public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
    OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
    request.addQuerystringParameter(FIELDS_QUERY, FIELDS);
    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
    service.signRequest(t, request);

    JsonElement userJson = null;
    try (Response response = service.execute(request)) {
      if (response.getCode() != HttpServletResponse.SC_OK) {
        throw new IOException(
            String.format(
                "Status %s (%s) for request %s",
                response.getCode(), response.getBody(), request.getUrl()));
      }
      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);

      if (log.isDebugEnabled()) {
        log.debug("User info response: {}", response.getBody());
      }
      if (userJson.isJsonObject()) {
        JsonObject jsonObject = userJson.getAsJsonObject();
        JsonElement id = jsonObject.get("id");
        if (id == null || id.isJsonNull()) {
          throw new IOException("Response doesn't contain id field");
        }
        JsonElement email = jsonObject.get("email");
        JsonElement name = jsonObject.get("name");
        // Heads up!
        // Lets keep `login` equal to `email`, since `username` field is
        // deprecated for Facebook API versions v2.0 and higher
        JsonElement login = jsonObject.get("email");

        return new OAuthUserInfo(
            FACEBOOK_PROVIDER_PREFIX + id.getAsString(),
            login == null || login.isJsonNull() ? null : login.getAsString(),
            email == null || email.isJsonNull() ? null : email.getAsString(),
            name == null || name.isJsonNull() ? null : name.getAsString(),
            null);
      }
    } catch (ExecutionException | InterruptedException e) {
      throw new RuntimeException("Cannot retrieve user info resource", e);
    }

    throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
  }