/*************************************************************************
* Copyright 2009-2015 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
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* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
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*
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*
* Copyright (c) 2008, Regents of the University of California
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************************************************************************/
package com.eucalyptus.objectstorage.pipeline;
import java.util.Set;
import javax.annotation.Nullable;
import org.apache.log4j.Logger;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.xbill.DNS.Name;
import com.eucalyptus.component.ComponentIds;
import com.eucalyptus.objectstorage.ObjectStorage;
import com.eucalyptus.objectstorage.util.OSGUtil;
import com.eucalyptus.util.dns.DomainNames;
import com.eucalyptus.ws.server.FilteredPipeline;
import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import com.google.common.collect.Sets;
/**
* Base class for all ObjectStorageGateway REST pipelines.
*
* @author zhill
*
*/
public abstract class ObjectStorageRESTPipeline extends FilteredPipeline {
private static Logger LOG = Logger.getLogger(ObjectStorageRESTPipeline.class);
private static final Splitter hostSplitter = Splitter.on(':').limit(2);
private static final Set<String> servicePaths = Sets.newHashSet(ComponentIds.lookup(ObjectStorage.class).getServicePath(), "/services/Walrus");
public static Set<String> getServicePaths() {
return servicePaths;
}
/**
* Does not accept any SOAP requests
*
* Two options: path-style or virtual-hosted.
*
* Path Style: objectstorage.hostname.com/bucket if using DNS, 192.168.1.1/services/ObjectStorage/bucket if not DNS
*
* Virtual-hosted: objectstorage.walrus.hostname.com/ if using DNS, not-applicable if not using DNS
*/
@Override
public boolean checkAccepts(HttpRequest message) {
String uriPath = message.getUri();
uriPath = (uriPath == null ? "" : uriPath);
String hostHeader = message.getHeader(HttpHeaders.Names.HOST);
hostHeader = (hostHeader == null ? "" : hostHeader);
return (!isSoapRequest(message) && (isObjectStorageHostName(hostHeader) || isObjectStorageServicePathRequest(uriPath, hostHeader)));
}
private static boolean isSoapRequest(HttpRequest message) {
return message.getHeaderNames().contains("SOAPAction");
}
/**
* The service path is the prefix for the URI and DNS is not used (if DNS used then it could be a bucket/key name)
*/
private boolean isObjectStorageServicePathRequest(final String uriPath, final String hostHeader) {
final Predicate<String> matchUriPredicate = new Predicate<String>() {
@Override
public boolean apply(@Nullable String s) {
return checkServicePathUri(uriPath, s);
}
};
return !isObjectStorageHostName(hostHeader) && Iterators.any(servicePaths.iterator(), matchUriPredicate);
}
private boolean checkServicePathUri(final String uriPath, final String servicePath) {
String tmpUri = uriPath;
if (!tmpUri.endsWith("/")) {
tmpUri += "/"; // Ensure a trailing / for check
}
return tmpUri.startsWith(servicePath + "/");
}
/**
* Returns whether or not the host header resolves to ObjectStorage
*
* @param hostHeader
* @return
*/
private boolean isObjectStorageHostName(String hostHeader) {
// Try both the raw name as well as a bucket-stripped version in case using virtual-hosting style.
return this.resolvesByHost(hostHeader) || this.maybeBucketHostedStyle(hostHeader);
}
/**
* Is ObjectSTorage domainname a subdomain of the host header host. If so, then it is likely a bucket prefix. Includes checksd for Walrus domain
* (walrus.myserver.com) for legacy support But, since S3 buckets can include '.' can't just parse on '.'s
*
* @param fullHostHeader
* @return
*/
private boolean maybeBucketHostedStyle(String fullHostHeader) {
if ( !Strings.isNullOrEmpty( fullHostHeader ) ) try {
final String host = Iterables.getFirst( hostSplitter.split( fullHostHeader ), fullHostHeader );
final Name hostDnsName = Name.fromString( host, Name.root );
return OSGUtil.isBucketName( hostDnsName, true );
} catch (Exception e) {
LOG.error("Error parsing domain name from hostname: " + fullHostHeader, e);
}
return false;
}
}