| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.blobstore.functions; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkArgument; |
| 22 | import static com.google.common.base.Preconditions.checkNotNull; |
| 23 | import static com.google.common.base.Preconditions.checkState; |
| 24 | import static org.jclouds.blobstore.reference.BlobStoreConstants.PROPERTY_USER_METADATA_PREFIX; |
| 25 | import static org.jclouds.blobstore.util.BlobStoreUtils.getNameFor; |
| 26 | |
| 27 | import java.net.URI; |
| 28 | import java.util.Map.Entry; |
| 29 | |
| 30 | import javax.inject.Inject; |
| 31 | import javax.inject.Named; |
| 32 | import javax.inject.Provider; |
| 33 | import javax.ws.rs.core.HttpHeaders; |
| 34 | |
| 35 | import org.jclouds.blobstore.domain.MutableBlobMetadata; |
| 36 | import org.jclouds.date.DateService; |
| 37 | import org.jclouds.http.HttpException; |
| 38 | import org.jclouds.http.HttpRequest; |
| 39 | import org.jclouds.http.HttpResponse; |
| 40 | import org.jclouds.http.HttpUtils; |
| 41 | import org.jclouds.rest.InvocationContext; |
| 42 | import org.jclouds.rest.internal.GeneratedHttpRequest; |
| 43 | |
| 44 | import com.google.common.annotations.VisibleForTesting; |
| 45 | import com.google.common.base.Function; |
| 46 | |
| 47 | /** |
| 48 | * @author Adrian Cole |
| 49 | */ |
| 50 | public class ParseSystemAndUserMetadataFromHeaders implements Function<HttpResponse, MutableBlobMetadata>, |
| 51 | InvocationContext<ParseSystemAndUserMetadataFromHeaders> { |
| 52 | private final String metadataPrefix; |
| 53 | private final DateService dateParser; |
| 54 | private final Provider<MutableBlobMetadata> metadataFactory; |
| 55 | |
| 56 | private String name; |
| 57 | private URI endpoint; |
| 58 | |
| 59 | @Inject |
| 60 | public ParseSystemAndUserMetadataFromHeaders(Provider<MutableBlobMetadata> metadataFactory, DateService dateParser, |
| 61 | @Named(PROPERTY_USER_METADATA_PREFIX) String metadataPrefix) { |
| 62 | this.metadataFactory = checkNotNull(metadataFactory, "metadataFactory"); |
| 63 | this.dateParser = checkNotNull(dateParser, "dateParser"); |
| 64 | this.metadataPrefix = checkNotNull(metadataPrefix, "metadataPrefix"); |
| 65 | } |
| 66 | |
| 67 | public MutableBlobMetadata apply(HttpResponse from) { |
| 68 | checkNotNull(from, "request"); |
| 69 | checkState(name != null, "name must be initialized by now"); |
| 70 | |
| 71 | MutableBlobMetadata to = metadataFactory.get(); |
| 72 | to.setName(name); |
| 73 | to.setUri(endpoint); |
| 74 | if (from.getPayload() != null) |
| 75 | HttpUtils.copy(from.getPayload().getContentMetadata(), to.getContentMetadata()); |
| 76 | addETagTo(from, to); |
| 77 | parseLastModifiedOrThrowException(from, to); |
| 78 | addUserMetadataTo(from, to); |
| 79 | return to; |
| 80 | } |
| 81 | |
| 82 | @VisibleForTesting |
| 83 | void addUserMetadataTo(HttpResponse from, MutableBlobMetadata metadata) { |
| 84 | for (Entry<String, String> header : from.getHeaders().entries()) { |
| 85 | if (header.getKey() != null && header.getKey().startsWith(metadataPrefix)) |
| 86 | metadata.getUserMetadata().put((header.getKey().substring(metadataPrefix.length())).toLowerCase(), |
| 87 | header.getValue()); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | @VisibleForTesting |
| 92 | void parseLastModifiedOrThrowException(HttpResponse from, MutableBlobMetadata metadata) throws HttpException { |
| 93 | String lastModified = from.getFirstHeaderOrNull(HttpHeaders.LAST_MODIFIED); |
| 94 | if (lastModified == null) { |
| 95 | // scaleup-storage uses the wrong case for the last modified header |
| 96 | if ((lastModified = from.getFirstHeaderOrNull("Last-modified")) == null) |
| 97 | throw new HttpException(HttpHeaders.LAST_MODIFIED + " header not present in response: " + from); |
| 98 | } |
| 99 | |
| 100 | // Walrus |
| 101 | if (lastModified.startsWith("20")) { |
| 102 | metadata.setLastModified(dateParser.iso8601DateParse(lastModified.replace("+0000", "Z"))); |
| 103 | } else { |
| 104 | metadata.setLastModified(dateParser.rfc822DateParse(lastModified)); |
| 105 | } |
| 106 | |
| 107 | if (metadata.getLastModified() == null) |
| 108 | throw new HttpException("could not parse: " + HttpHeaders.LAST_MODIFIED + ": " + lastModified); |
| 109 | } |
| 110 | |
| 111 | protected void addETagTo(HttpResponse from, MutableBlobMetadata metadata) { |
| 112 | String eTag = from.getFirstHeaderOrNull(HttpHeaders.ETAG); |
| 113 | if (metadata.getETag() == null && eTag != null) { |
| 114 | metadata.setETag(eTag); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | public ParseSystemAndUserMetadataFromHeaders setContext(HttpRequest request) { |
| 119 | this.endpoint = request.getEndpoint(); |
| 120 | checkArgument(request instanceof GeneratedHttpRequest<?>, "note this handler requires a GeneratedHttpRequest"); |
| 121 | return setName(getNameFor(GeneratedHttpRequest.class.cast(request))); |
| 122 | } |
| 123 | |
| 124 | public ParseSystemAndUserMetadataFromHeaders setName(String name) { |
| 125 | this.name = checkNotNull(name, "name"); |
| 126 | return this; |
| 127 | } |
| 128 | } |