/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.jclouds.blobstore.functions;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.jclouds.blobstore.reference.BlobStoreConstants.PROPERTY_USER_METADATA_PREFIX;
import static org.jclouds.blobstore.util.BlobStoreUtils.getNameFor;
import java.net.URI;
import java.util.Map.Entry;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import org.jclouds.blobstore.domain.MutableBlobMetadata;
import org.jclouds.date.DateService;
import org.jclouds.http.HttpException;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpUtils;
import org.jclouds.rest.InvocationContext;
import org.jclouds.rest.internal.GeneratedHttpRequest;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.net.HttpHeaders;
public class ParseSystemAndUserMetadataFromHeaders implements Function<HttpResponse, MutableBlobMetadata>,
InvocationContext<ParseSystemAndUserMetadataFromHeaders> {
private final String metadataPrefix;
private final DateService dateParser;
private final Provider<MutableBlobMetadata> metadataFactory;
private String name;
private URI endpoint;
@Inject
public ParseSystemAndUserMetadataFromHeaders(Provider<MutableBlobMetadata> metadataFactory, DateService dateParser,
@Named(PROPERTY_USER_METADATA_PREFIX) String metadataPrefix) {
this.metadataFactory = checkNotNull(metadataFactory, "metadataFactory");
this.dateParser = checkNotNull(dateParser, "dateParser");
this.metadataPrefix = checkNotNull(metadataPrefix, "metadataPrefix");
}
public MutableBlobMetadata apply(HttpResponse from) {
checkNotNull(from, "request");
checkState(name != null, "name must be initialized by now");
MutableBlobMetadata to = metadataFactory.get();
to.setName(name);
to.setUri(endpoint);
if (from.getPayload() != null)
HttpUtils.copy(from.getPayload().getContentMetadata(), to.getContentMetadata());
addETagTo(from, to);
parseLastModifiedOrThrowException(from, to);
addUserMetadataTo(from, to);
return to;
}
@VisibleForTesting
void addUserMetadataTo(HttpResponse from, MutableBlobMetadata metadata) {
for (Entry<String, String> header : from.getHeaders().entries()) {
if (header.getKey() != null && header.getKey().startsWith(metadataPrefix))
metadata.getUserMetadata().put((header.getKey().substring(metadataPrefix.length())).toLowerCase(),
header.getValue());
}
}
@VisibleForTesting
void parseLastModifiedOrThrowException(HttpResponse from, MutableBlobMetadata metadata) throws HttpException {
String lastModified = from.getFirstHeaderOrNull(HttpHeaders.LAST_MODIFIED);
if (lastModified == null) {
// scaleup-storage uses the wrong case for the last modified header
if ((lastModified = from.getFirstHeaderOrNull("Last-modified")) == null)
throw new HttpException(HttpHeaders.LAST_MODIFIED + " header not present in response: " + from);
}
// Walrus
if (lastModified.startsWith("20")) {
metadata.setLastModified(dateParser.iso8601DateParse(lastModified.replace("+0000", "Z")));
} else {
metadata.setLastModified(dateParser.rfc822DateParse(lastModified));
}
if (metadata.getLastModified() == null)
throw new HttpException("could not parse: " + HttpHeaders.LAST_MODIFIED + ": " + lastModified);
}
protected void addETagTo(HttpResponse from, MutableBlobMetadata metadata) {
String eTag = from.getFirstHeaderOrNull(HttpHeaders.ETAG);
if (metadata.getETag() == null && eTag != null) {
metadata.setETag(eTag);
}
}
public ParseSystemAndUserMetadataFromHeaders setContext(HttpRequest request) {
this.endpoint = request.getEndpoint();
checkArgument(request instanceof GeneratedHttpRequest, "note this handler requires a GeneratedHttpRequest");
return setName(getNameFor(GeneratedHttpRequest.class.cast(request)));
}
public ParseSystemAndUserMetadataFromHeaders setName(String name) {
this.name = checkNotNull(name, "name");
return this;
}
}