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The Microsoft Azure IoT Device SDK for Java
/*
* Copyright (c) Microsoft. All rights reserved.
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
package com.microsoft.azure.sdk.iot.device.auth;
import com.microsoft.azure.sdk.iot.device.transport.TransportException;
import lombok.extern.slf4j.Slf4j;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
/**
* Authentication method that uses a shared access signature token and allows for token refresh.
*/
@Slf4j
public abstract class IotHubSasTokenWithRefreshAuthenticationProvider extends IotHubSasTokenAuthenticationProvider
{
/**
* Constructor for IotHubSasTokenWithRefreshAuthenticationProvider
* @param hostname the hostname
* @param gatewayHostName the gateway hostname
* @param deviceId the device id
* @param moduleId the module id
* @param sharedAccessToken the shared access token
* @param suggestedTimeToLiveSeconds the time to live for generated tokens
* @param timeBufferPercentage the percent of a sas token's life to live before renewing
*/
protected IotHubSasTokenWithRefreshAuthenticationProvider(String hostname, String gatewayHostName, String deviceId, String moduleId, String sharedAccessToken, int suggestedTimeToLiveSeconds, int timeBufferPercentage)
{
super(hostname, gatewayHostName, deviceId, moduleId, suggestedTimeToLiveSeconds, timeBufferPercentage);
this.sasToken = new IotHubSasToken(hostname, deviceId, null, sharedAccessToken, moduleId, getExpiryTimeInSeconds());
}
/**
* Constructor for IotHubSasTokenWithRefreshAuthenticationProvider
* @param hostname the hostname
* @param gatewayHostName the gateway hostname
* @param deviceId the device id
* @param moduleId the module id
* @param sharedAccessToken the shared access token
* @param suggestedTimeToLiveSeconds the time to live for generated tokens
* @param timeBufferPercentage the percent of a sas token's life to live before renewing
* @param sslContext the SSLContext the connection will use
*/
protected IotHubSasTokenWithRefreshAuthenticationProvider(String hostname, String gatewayHostName, String deviceId, String moduleId, String sharedAccessToken, int suggestedTimeToLiveSeconds, int timeBufferPercentage, SSLContext sslContext)
{
super(hostname, gatewayHostName, deviceId, moduleId, suggestedTimeToLiveSeconds, timeBufferPercentage, sslContext);
this.sasToken = new IotHubSasToken(hostname, deviceId, null, sharedAccessToken, moduleId, getExpiryTimeInSeconds());
}
/**
* Constructs the audience string to be used in a sas token
* @param hostname the hostname
* @param deviceId the device id
* @param moduleId the module id
* @return the audience
* @throws UnsupportedEncodingException if UTF-8 encoding is not supported
*/
protected static String buildAudience(String hostname, String deviceId, String moduleId) throws UnsupportedEncodingException
{
if (hostname == null || deviceId == null || moduleId == null || hostname.isEmpty() || deviceId.isEmpty() || moduleId.isEmpty())
{
throw new IllegalArgumentException("No argument can be null or empty");
}
return URLEncoder.encode(String.format("%s/devices/%s/modules/%s", hostname, deviceId, moduleId), StandardCharsets.UTF_8.name());
}
/**
* Returns false as instances of this class will always be able to renew their own sas token
* @return false
*/
@Override
public boolean isAuthenticationProviderRenewalNecessary()
{
return false;
}
/**
* Renew the saved sas token
* @throws IOException If an IOException is encountered while refreshing the sas token
* @throws TransportException If a TransportException is encountered while refreshing the sas token
*/
public abstract void refreshSasToken() throws IOException, TransportException;
/**
* Check if sas token should be renewed at all, and then renew it if necessary
* @return the renewed token, or the old token if it did not need to be renewed
* @throws IOException If an IOException is encountered while refreshing the sas token
* @throws TransportException If a TransportException is encountered while refreshing the sas token
*/
@Override
public char[] getSasToken() throws IOException, TransportException
{
log.debug("Renewing the internal sas token");
this.refreshSasToken();
return this.sasToken.toString().toCharArray();
}
}
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