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/*
* Copyright 2016-2017, Nokia Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.vnfm;
import com.google.common.annotations.VisibleForTesting;
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import java.io.IOException;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSocketFactory;
import okhttp3.*;
import org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.api.VnfmInfoProvider;
import org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.onap.core.GenericExternalSystemInfoProvider;
import org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.onap.core.VnfmCredentials;
import org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.onap.core.VnfmUrls;
import org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.util.SystemFunctions;
import org.slf4j.Logger;
import static org.onap.vfc.nfvo.driver.vnfm.svnfm.nokia.util.CbamUtils.buildFatalFailure;
import static org.slf4j.LoggerFactory.getLogger;
import static org.springframework.http.HttpHeaders.CONTENT_TYPE;
import static org.springframework.http.MediaType.APPLICATION_FORM_URLENCODED_VALUE;
/**
* Responsible for providing a token to access CBAM APIs
*/
//even if the value for grant type an user password is the same they do not mean the same thing
//the duplication of this is intentional
@SuppressWarnings("squid:S1192")
public class CbamTokenProvider extends CbamSecurityProvider {
public static final int MAX_RETRY_COUNT = 5;
public static final String GRANT_TYPE = "password";
public static final String CLIENT_SECRET = "password";
private static final String CBAM_TOKEN_URL = "realms/cbam/protocol/openid-connect/token";
private static Logger logger = getLogger(CbamTokenProvider.class);
private final VnfmInfoProvider vnfmInfoProvider;
private volatile CurrentToken token;
CbamTokenProvider(VnfmInfoProvider vnfmInfoProvider) {
this.vnfmInfoProvider = vnfmInfoProvider;
}
/**
* @return the token to access CBAM APIs (ex. 123456)
*/
public Interceptor getToken(String vnfmId) {
return new OauthInterceptor(getTokenInternal(vnfmId));
}
private String getTokenInternal(String vnfmId) {
logger.trace("Requesting token for accessing CBAM API");
synchronized (this) {
long now = SystemFunctions.systemFunctions().currentTimeMillis();
if (token == null || token.refreshAfter < now) {
if (token == null) {
logger.debug("No token: getting first token");
} else {
logger.debug("Token expired {} ms ago", (now - token.refreshAfter));
}
refresh(vnfmId);
} else {
logger.debug("Token will expire in {} ms", (now - token.refreshAfter));
}
}
return token.token.accessToken;
}
private void refresh(String vnfmId) {
VnfmUrls vnfmUrls = GenericExternalSystemInfoProvider.convert(vnfmInfoProvider.getVnfmInfo(vnfmId));
VnfmCredentials vnfmCredentials = GenericExternalSystemInfoProvider.convertToCredentials(vnfmInfoProvider.getVnfmInfo(vnfmId));
FormBody body = new FormBody.Builder()
.add("grant_type", GRANT_TYPE)
.add("client_id", vnfmCredentials.getClientId())
.add("client_secret", vnfmCredentials.getClientSecret())
.add("username", vnfmCredentials.getUsername())
.add(CLIENT_SECRET, vnfmCredentials.getPassword()).build();
String cbamKeyCloakBaseUrl = vnfmUrls.getAuthUrl();
Request request = new Request.Builder().url(cbamKeyCloakBaseUrl + CBAM_TOKEN_URL).addHeader(CONTENT_TYPE, APPLICATION_FORM_URLENCODED_VALUE).post(body).build();
OkHttpClient.Builder builder = new OkHttpClient.Builder();
SSLSocketFactory sslSocketFac = buildSSLSocketFactory();
HostnameVerifier hostnameVerifier = buildHostnameVerifier();
OkHttpClient client = builder.sslSocketFactory(sslSocketFac).hostnameVerifier(hostnameVerifier).build();
Exception lastException = null;
for (int i = 0; i < MAX_RETRY_COUNT; i++) {
try {
Response response = execute(client.newCall(request));
if (response.isSuccessful()) {
String json = response.body().string();
TokenResponse tokenResponse = new Gson().fromJson(json, TokenResponse.class);
//token is scheduled to be refreshed in the half time before expiring
token = new CurrentToken(tokenResponse, getTokenRefreshTime(tokenResponse));
return;
} else {
throw buildFatalFailure(logger, "Bad response from CBAM KeyStone");
}
} catch (Exception e) {
lastException = e;
logger.warn("Unable to get token to access CBAM API (" + (i + 1) + "/" + MAX_RETRY_COUNT + ")", e);
}
}
throw buildFatalFailure(logger, "Unable to get token to access CBAM API (giving up retries)", lastException);
}
@VisibleForTesting
Response execute(Call call) throws IOException {
return call.execute();
}
/**
* - a new token is requested after the half of the time has expired till which the currently
* used token is valid
*
* @param token the currently held token
* @return the point in time after which a new token must be requested
*/
private long getTokenRefreshTime(TokenResponse token) {
return SystemFunctions.systemFunctions().currentTimeMillis() + token.expiresIn * (1000 / 2);
}
private static class OauthInterceptor implements Interceptor {
private final String token;
OauthInterceptor(String token) {
this.token = token;
}
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Request.Builder builder = request.newBuilder();
builder.addHeader("Authorization", "Bearer " + token);
Request request1 = builder.build();
return chain.proceed(request1);
}
}
private static class CurrentToken {
private final TokenResponse token;
private final long refreshAfter;
CurrentToken(TokenResponse token, long refreshAfter) {
this.refreshAfter = refreshAfter;
this.token = token;
}
}
/**
* Represents the token received from CBAM
*/
private static class TokenResponse {
@SerializedName("access_token")
String accessToken;
@SerializedName("expires_in")
int expiresIn;
@SerializedName("id_token")
String tokenId;
@SerializedName("not-before-policy")
int notBeforePolicy;
@SerializedName("refresh_expires_in")
int refreshExpiresIn;
@SerializedName("refresh_token")
String refreshToken;
@SerializedName("session_state")
String sessionState;
@SerializedName("token_type")
String tokenType;
}
}
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