com.networknt.rule.snow.SnowTokenRequestTransformAction Maven / Gradle / Ivy
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A yaml rule action implementation to get the ServiceNow authorization token and inject into the Authorization header for any ServiceNow request from light-gateway.
package com.networknt.rule.snow;
import com.networknt.client.ClientConfig;
import com.networknt.client.oauth.TokenResponse;
import com.networknt.config.Config;
import com.networknt.config.JsonMapper;
import com.networknt.config.PathPrefixAuth;
import com.networknt.http.client.HttpClientRequest;
import com.networknt.http.client.ssl.TLSConfig;
import com.networknt.rule.IAction;
import com.networknt.rule.RuleActionValue;
import com.networknt.rule.RuleConstants;
import com.networknt.utility.ModuleRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.*;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.*;
import java.util.stream.Collectors;
/**
* It is called from the request transform interceptor from the light-gateway to get the password grant type ServiceNow token
* to replace the JWT token that consumers use to access the gateway. This allows the ServiceNow API to be exposed on the
* Gateway as a standard API with client credentials token for API to API invocations.
*
* @author Steve Hu
*/
public class SnowTokenRequestTransformAction implements IAction {
private static final Logger logger = LoggerFactory.getLogger(SnowTokenRequestTransformAction.class);
// change the config to static so that it can cache the token retrieved until expiration time.
private static final SnowConfig config = SnowConfig.load();
private static HttpClient client;
public SnowTokenRequestTransformAction() {
if(logger.isInfoEnabled()) logger.info("SnowTokenRequestTransformAction is constructed");
List masks = new ArrayList<>();
masks.add("password");
masks.add("client_secret");
ModuleRegistry.registerPlugin(
SnowTokenRequestTransformAction.class.getPackage().getImplementationTitle(),
SnowTokenRequestTransformAction.class.getPackage().getImplementationVersion(),
SnowConfig.CONFIG_NAME,
SnowTokenRequestTransformAction.class.getName(),
Config.getNoneDecryptedInstance().getJsonMapConfigNoCache(SnowConfig.CONFIG_NAME),
masks);
}
@Override
public void performAction(Map objMap, Map resultMap, Collection actionValues) {
resultMap.put(RuleConstants.RESULT, true);
String requestPath = (String)objMap.get("requestPath");
if(logger.isTraceEnabled()) logger.trace("requestPath = " + requestPath);
for(PathPrefixAuth pathPrefixAuth: config.getPathPrefixAuths()) {
if(requestPath.startsWith(pathPrefixAuth.getPathPrefix())) {
if(logger.isTraceEnabled()) logger.trace("found with requestPath = " + requestPath + " prefix = " + pathPrefixAuth.getPathPrefix());
if(System.currentTimeMillis() >= pathPrefixAuth.getExpiration()) {
if(logger.isTraceEnabled()) logger.trace("Cached token {} is expired with current time {} and expired time {}", pathPrefixAuth.getAccessToken() != null ? pathPrefixAuth.getAccessToken().substring(0, 20) : null, System.currentTimeMillis(), pathPrefixAuth.getExpiration());
TokenResponse tokenResponse = getAccessToken(pathPrefixAuth.getTokenUrl(), pathPrefixAuth.getUsername(), pathPrefixAuth.getPassword(), pathPrefixAuth.getClientId(), pathPrefixAuth.getClientSecret(), pathPrefixAuth.getGrantType());
if(tokenResponse != null) {
pathPrefixAuth.setExpiration(System.currentTimeMillis() + tokenResponse.getExpiresIn() * 1000 - 60000);
pathPrefixAuth.setAccessToken(tokenResponse.getAccessToken());
if(logger.isTraceEnabled()) logger.trace("Got a new token {} and cached it with expiration time {}", pathPrefixAuth.getAccessToken() != null ? pathPrefixAuth.getAccessToken().substring(0, 20) : null, pathPrefixAuth.getExpiration());
} else {
if(logger.isTraceEnabled()) logger.trace("tokenResponse is null");
return;
}
}
// either a new token is retrieved or cached token is not expired. Put the token into the Authorization header.
if(pathPrefixAuth.getAccessToken() != null) {
Map requestHeaders = new HashMap<>();
Map updateMap = new HashMap<>();
updateMap.put("Authorization", "Bearer " + pathPrefixAuth.getAccessToken());
requestHeaders.put("update", updateMap);
resultMap.put("requestHeaders", requestHeaders);
return;
}
}
}
}
private TokenResponse getAccessToken(String serverUrl, String username, String password, String clientId, String clientSecret, String grantType) {
TokenResponse tokenResponse = null;
if(client == null) {
try {
HttpClient.Builder clientBuilder = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.NORMAL)
.connectTimeout(Duration.ofMillis(ClientConfig.get().getTimeout()))
.sslContext(HttpClientRequest.createSSLContext());
if(config.getProxyHost() != null) clientBuilder.proxy(ProxySelector.of(new InetSocketAddress(config.getProxyHost(), config.getProxyPort() == 0 ? 443 : config.getProxyPort())));
if(config.isEnableHttp2()) clientBuilder.version(HttpClient.Version.HTTP_2);
// this a workaround to bypass the hostname verification in jdk11 http client.
Map tlsMap = (Map)ClientConfig.get().getMappedConfig().get(ClientConfig.TLS);
if(tlsMap != null && !Boolean.TRUE.equals(tlsMap.get(TLSConfig.VERIFY_HOSTNAME))) {
final Properties props = System.getProperties();
props.setProperty("jdk.internal.httpclient.disableHostnameVerification", Boolean.TRUE.toString());
}
client = clientBuilder.build();
} catch (IOException e) {
logger.error("Cannot create HttpClient:", e);
return null;
}
}
try {
if(serverUrl == null) {
logger.error("tokenUrl is null");
return null;
}
Map parameters = new HashMap<>();
parameters.put("username", username);
parameters.put("password", password);
parameters.put("client_id", clientId);
parameters.put("client_secret", clientSecret);
parameters.put("grant_type", grantType);
String form = parameters.entrySet()
.stream()
.map(e -> e.getKey() + "=" + URLEncoder.encode(e.getValue(), StandardCharsets.UTF_8))
.collect(Collectors.joining("&"));
if(logger.isTraceEnabled()) logger.trace("request body = " + form);
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(serverUrl))
.headers("Content-Type", "application/x-www-form-urlencoded")
.POST(HttpRequest.BodyPublishers.ofString(form))
.build();
HttpResponse response = client.send(request, HttpResponse.BodyHandlers.ofString());
// {"access_token":"kldsfoo4...","refresh_token: "390343...", "scope": "useraccount","token_type":"Bearer", "expires_in":1079}
if(response.statusCode() == 200) {
// construct a token response and return it.
Map map = JsonMapper.string2Map(response.body().toString());
if(map != null) {
tokenResponse = new TokenResponse();
tokenResponse.setAccessToken((String)map.get("access_token"));
tokenResponse.setExpiresIn(((Integer)map.get("expires_in")));
return tokenResponse;
} else {
logger.error("response body cannot be parsed as a JSON " + response.body());
return null;
}
} else {
logger.error("Error in getting the token with status code " + response.statusCode() + " and body " + response.body().toString());
return null;
}
} catch (Exception e) {
logger.error("Exception:", e);
return null;
}
}
}