public OAuthUserInfo getUserInfo()

in src/main/java/com/googlesource/gerrit/plugins/oauth/AzureActiveDirectoryService.java [109:198]
62 lines of code
17 McCabe index (conditional complexity)

  public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
    // ?: Have we set a custom tenant and is this a tenant other than the one set in
    // TENANTS_WITHOUT_VALIDATION
    if (!TENANTS_WITHOUT_VALIDATION.contains(tenant)) {
      // -> Yes, we are using a tenant that should be validated, so verify that is issued for the
      // same one that we
      // have set.
      String tid = getTokenJson(token.getToken()).get("tid").getAsString();

      // ?: Verify that this token has the same tenant as we are currently using
      if (!tenant.equals(tid)) {
        // -> No, this tenant does not equals the one in the token. So we should stop processing
        log.warn(
            String.format(
                "The token was issued by the tenant [%s] while we are set to use [%s]",
                tid, tenant));
        // Return null so the user will be shown Unauthorized.
        return null;
      }
    }

    // Due to scribejava does not expose the id_token we need to do this a bit convoluted way to
    // extract this our self
    // see <a href="https://github.com/scribejava/scribejava/issues/968">Obtaining id_token from
    // access_token</a> for
    // the scribejava issue on this.
    String rawToken = token.getRaw();
    JsonObject jwtJson = gson.fromJson(rawToken, JsonObject.class);
    String idTokenBase64 = jwtJson.get("id_token").getAsString();
    String aud = getTokenJson(idTokenBase64).get("aud").getAsString();

    // ?: Does this token have the same clientId set in the 'aud' part of the id_token as we are
    // using.
    // If not we should reject it
    // see <a href="https://docs.microsoft.com/en-us/azure/active-directory/develop/id-tokens">id
    // tokens Payload claims></a>
    // for information on the aud claim.
    if (!clientId.equals(aud)) {
      log.warn(
          String.format(
              "The id_token had aud [%s] while we expected it to be equal to the clientId [%s]",
              aud, clientId));
      // Return null so the user will be shown Unauthorized.
      return null;
    }

    OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
    service.signRequest(t, request);
    request.addHeader("Accept", "*/*");

    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("mail");
        JsonElement name = jsonObject.get("displayName");
        String login = null;

        if (useEmailAsUsername && !email.isJsonNull()) {
          login = email.getAsString().split("@")[0];
        }

        return new OAuthUserInfo(
            providerPrefix + id.getAsString() /*externalId*/,
            login /*username*/,
            email == null || email.isJsonNull() ? null : email.getAsString() /*email*/,
            name == null || name.isJsonNull() ? null : name.getAsString() /*displayName*/,
            linkOffice365Id ? OFFICE365_PROVIDER_PREFIX + id.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));
  }