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/*
* Licensed to the University Corporation for Advanced Internet Development,
* Inc. (UCAID) under one or more contributor license agreements. See the
* NOTICE file distributed with this work for additional information regarding
* copyright ownership. The UCAID licenses this file to You 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.opensaml.saml.metadata.resolver.impl;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Timer;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import net.shibboleth.utilities.java.support.component.ComponentSupport;
import net.shibboleth.utilities.java.support.resolver.ResolverException;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.util.EntityUtils;
import org.opensaml.security.httpclient.HttpClientSecurityParameters;
import org.opensaml.security.httpclient.HttpClientSecuritySupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A metadata provider that pulls metadata using an HTTP GET. Metadata is cached until one of these criteria is met:
*
* - The smallest cacheDuration within the metadata is exceeded
* - The earliest validUntil time within the metadata is exceeded
* - The maximum cache duration is exceeded
*
*
* Metadata is filtered prior to determining the cache expiration data. This allows a filter to remove XMLObjects that
* may effect the cache duration but for which the user of this provider does not care about.
*
* It is the responsibility of the caller to re-initialize, via {@link #initialize()}, if any properties of this
* provider are changed.
*/
public class HTTPMetadataResolver extends AbstractReloadingMetadataResolver {
/** Class logger. */
@Nonnull private final Logger log = LoggerFactory.getLogger(HTTPMetadataResolver.class);
/** HTTP Client used to pull the metadata. */
private HttpClient httpClient;
/** URL to the Metadata. */
private URI metadataURI;
/** The ETag provided when the currently cached metadata was fetched. */
private String cachedMetadataETag;
/** The Last-Modified information provided when the currently cached metadata was fetched. */
private String cachedMetadataLastModified;
/** Optional HttpClient security parameters.*/
@Nullable private HttpClientSecurityParameters httpClientSecurityParameters;
/**
* Constructor.
*
* @param client HTTP client used to pull in remote metadata
* @param metadataURL URL to the remove remote metadata
*
* @throws ResolverException thrown if the HTTP client is null or the metadata URL provided is invalid
*/
public HTTPMetadataResolver(final HttpClient client, final String metadataURL) throws ResolverException {
this(null, client, metadataURL);
}
/**
* Constructor.
*
* @param backgroundTaskTimer timer used to schedule background metadata refresh tasks
* @param client HTTP client used to pull in remote metadata
* @param metadataURL URL to the remove remote metadata
*
* @throws ResolverException thrown if the HTTP client is null or the metadata URL provided is invalid
*/
public HTTPMetadataResolver(final Timer backgroundTaskTimer, final HttpClient client, final String metadataURL)
throws ResolverException {
super(backgroundTaskTimer);
if (client == null) {
throw new ResolverException("HTTP client may not be null");
}
httpClient = client;
try {
metadataURI = new URI(metadataURL);
} catch (final URISyntaxException e) {
throw new ResolverException("Illegal URL syntax", e);
}
}
/**
* Gets the URL to fetch the metadata.
*
* @return the URL to fetch the metadata
*/
public String getMetadataURI() {
return metadataURI.toASCIIString();
}
/**
* Get the instance of {@link HttpClientSecurityParameters} which provides various parameters to influence
* the security behavior of the HttpClient instance.
*
* @return the parameters instance, or null
*/
@Nullable protected HttpClientSecurityParameters getHttpClientSecurityParameters() {
return httpClientSecurityParameters;
}
/**
* Set an instance of {@link HttpClientSecurityParameters} which provides various parameters to influence
* the security behavior of the HttpClient instance.
*
*
* For all TLS-related parameters, must be used in conjunction with an HttpClient instance
* which is configured with either a:
*
*
*
* -
* a {@link net.shibboleth.utilities.java.support.httpclient.TLSSocketFactory}
*
* -
* {@link org.opensaml.security.httpclient.impl.SecurityEnhancedTLSSocketFactory} which wraps
* an instance of {@link net.shibboleth.utilities.java.support.httpclient.TLSSocketFactory}, with
* the latter likely configured in a "no trust" configuration. This variant is required if either a
* trust engine or a client TLS credential is to be used.
*
*
*
*
* For convenience methods for building a
* {@link net.shibboleth.utilities.java.support.httpclient.TLSSocketFactory},
* see {@link net.shibboleth.utilities.java.support.httpclient.HttpClientSupport}.
*
*
*
* If the appropriate TLS socket factory is not configured and a trust engine is specified,
* then this will result in no TLS trust evaluation being performed and a
* {@link ResolverException} will ultimately be thrown.
*
*
* @param params the security parameters
*/
public void setHttpClientSecurityParameters(@Nullable final HttpClientSecurityParameters params) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
ComponentSupport.ifDestroyedThrowDestroyedComponentException(this);
httpClientSecurityParameters = params;
}
/** {@inheritDoc} */
@Override
protected void doDestroy() {
httpClient = null;
httpClientSecurityParameters = null;
metadataURI = null;
cachedMetadataETag = null;
cachedMetadataLastModified = null;
super.doDestroy();
}
/** {@inheritDoc} */
@Override
protected String getMetadataIdentifier() {
return metadataURI.toString();
}
/**
* Gets the metadata document from the remote server.
*
* @return the metadata from remote server, or null if the metadata document has not changed since the last
* retrieval
*
* @throws ResolverException thrown if there is a problem retrieving the metadata from the remote server
*/
@Override
protected byte[] fetchMetadata() throws ResolverException {
final HttpGet httpGet = buildHttpGet();
final HttpClientContext context = buildHttpClientContext(httpGet);
HttpResponse response = null;
try {
log.debug("{} Attempting to fetch metadata document from '{}'", getLogPrefix(), metadataURI);
response = httpClient.execute(httpGet, context);
HttpClientSecuritySupport.checkTLSCredentialEvaluated(context, metadataURI.getScheme());
final int httpStatusCode = response.getStatusLine().getStatusCode();
if (httpStatusCode == HttpStatus.SC_NOT_MODIFIED) {
log.debug("{} Metadata document from '{}' has not changed since last retrieval",
getLogPrefix(), getMetadataURI());
return null;
}
if (httpStatusCode != HttpStatus.SC_OK) {
final String errMsg =
"Non-ok status code " + httpStatusCode + " returned from remote metadata source " + metadataURI;
log.error("{} " + errMsg, getLogPrefix());
throw new ResolverException(errMsg);
}
processConditionalRetrievalHeaders(response);
final byte[] rawMetadata = getMetadataBytesFromResponse(response);
log.debug("{} Successfully fetched {} bytes of metadata from {}",
getLogPrefix(), rawMetadata.length, getMetadataURI());
return rawMetadata;
} catch (final IOException e) {
final String errMsg = "Error retrieving metadata from " + metadataURI;
log.error("{} {}: {}", getLogPrefix(), errMsg, e.getMessage());
throw new ResolverException(errMsg, e);
} finally {
try {
if (response != null && response instanceof CloseableHttpResponse) {
((CloseableHttpResponse) response).close();
}
} catch (final IOException e) {
log.error("{} Error closing HTTP response from {}", metadataURI, getLogPrefix(), e);
}
}
}
/**
* Builds the {@link HttpGet} instance used to fetch the metadata. The returned method advertises support for GZIP
* and deflate compression, enables conditional GETs if the cached metadata came with either an ETag or
* Last-Modified information, and sets up basic authentication if such is configured.
*
* @return the constructed HttpGet instance
*/
protected HttpGet buildHttpGet() {
final HttpGet getMethod = new HttpGet(getMetadataURI());
if (cachedMetadataETag != null) {
getMethod.setHeader("If-None-Match", cachedMetadataETag);
}
if (cachedMetadataLastModified != null) {
getMethod.setHeader("If-Modified-Since", cachedMetadataLastModified);
}
return getMethod;
}
/**
* Build the {@link HttpClientContext} instance which will be used to invoke the {@link HttpClient} request.
*
* @param request the current HTTP request
*
* @return a new instance of {@link HttpClientContext}
*/
protected HttpClientContext buildHttpClientContext(@Nonnull final HttpUriRequest request) {
// TODO Really request should be @Nonnull, change when we remove deprecated buildHttpClientContext()
final HttpClientContext context = HttpClientContext.create();
HttpClientSecuritySupport.marshalSecurityParameters(context, httpClientSecurityParameters, true);
HttpClientSecuritySupport.addDefaultTLSTrustEngineCriteria(context, request);
return context;
}
/**
* Records the ETag and Last-Modified headers, from the response, if they are present.
*
* @param response GetMethod containing a valid HTTP response
*/
protected void processConditionalRetrievalHeaders(final HttpResponse response) {
Header httpHeader = response.getFirstHeader("ETag");
if (httpHeader != null) {
cachedMetadataETag = httpHeader.getValue();
}
httpHeader = response.getFirstHeader("Last-Modified");
if (httpHeader != null) {
cachedMetadataLastModified = httpHeader.getValue();
}
}
/**
* Extracts the raw metadata bytes from the response taking in to account possible deflate and GZip compression.
*
* @param response GetMethod containing a valid HTTP response
*
* @return the raw metadata bytes
*
* @throws ResolverException thrown if there is a problem getting the raw metadata bytes from the response
*/
protected byte[] getMetadataBytesFromResponse(final HttpResponse response) throws ResolverException {
log.debug("{} Attempting to extract metadata from response to request for metadata from '{}'",
getLogPrefix(), getMetadataURI());
try {
final InputStream ins = response.getEntity().getContent();
return inputstreamToByteArray(ins);
} catch (final IOException e) {
log.error("{} Unable to read response: {}", getLogPrefix(), e.getMessage());
throw new ResolverException("Unable to read response", e);
} finally {
// Make sure entity has been completely consumed.
EntityUtils.consumeQuietly(response.getEntity());
}
}
}