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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
108 lines
4.3 KiB
Java
108 lines
4.3 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.io.BaseEncoding.base32;
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import static com.google.common.io.BaseEncoding.base64;
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import static com.google.common.net.HttpHeaders.AUTHORIZATION;
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import static com.google.common.net.HttpHeaders.CONTENT_DISPOSITION;
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import static com.google.common.net.HttpHeaders.CONTENT_LENGTH;
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import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
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import static java.lang.String.format;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import com.google.appengine.api.urlfetch.HTTPHeader;
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import com.google.appengine.api.urlfetch.HTTPRequest;
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import com.google.appengine.api.urlfetch.HTTPResponse;
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import com.google.common.base.Optional;
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import com.google.common.net.MediaType;
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import java.security.NoSuchAlgorithmException;
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import java.security.ProviderException;
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import java.security.SecureRandom;
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/** Helper methods for the App Engine URL fetch service. */
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public final class UrlFetchUtils {
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@NonFinalForTesting
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private static SecureRandom secureRandom = initSecureRandom();
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/** Returns value of first header matching {@code name}. */
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public static Optional<String> getHeaderFirst(HTTPResponse rsp, String name) {
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return getHeaderFirstInternal(rsp.getHeadersUncombined(), name);
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}
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/** Returns value of first header matching {@code name}. */
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public static Optional<String> getHeaderFirst(HTTPRequest req, String name) {
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return getHeaderFirstInternal(req.getHeaders(), name);
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}
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private static Optional<String> getHeaderFirstInternal(Iterable<HTTPHeader> hdrs, String name) {
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name = name.toLowerCase();
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for (HTTPHeader header : hdrs) {
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if (header.getName().toLowerCase().equals(name)) {
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return Optional.of(header.getValue());
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}
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}
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return Optional.absent();
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}
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/**
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* Sets payload on request as a {@code multipart/form-data} request.
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*
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* <p>This is equivalent to running the command: {@code curl -F fieldName=@payload.txt URL}
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*
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* @see "http://www.ietf.org/rfc/rfc2388.txt"
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*/
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public static <T> void setPayloadMultipart(
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HTTPRequest request, String name, String filename, MediaType contentType, T data) {
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String boundary = createMultipartBoundary();
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StringBuilder multipart = new StringBuilder();
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multipart.append(format("--%s\r\n", boundary));
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multipart.append(format("%s: form-data; name=\"%s\"; filename=\"%s\"\r\n",
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CONTENT_DISPOSITION, name, filename));
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multipart.append(format("%s: %s\r\n", CONTENT_TYPE, contentType.toString()));
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multipart.append("\r\n");
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multipart.append(data);
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multipart.append("\r\n");
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multipart.append(format("--%s--", boundary));
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byte[] payload = multipart.toString().getBytes(UTF_8);
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request.addHeader(new HTTPHeader(CONTENT_TYPE, "multipart/form-data; boundary=" + boundary));
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request.addHeader(new HTTPHeader(CONTENT_LENGTH, Integer.toString(payload.length)));
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request.setPayload(payload);
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}
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private static String createMultipartBoundary() {
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byte[] rand = new byte[5]; // Avoid base32 padding since `5 * 8 % log2(32) == 0`
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secureRandom.nextBytes(rand);
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return "------------------------------" + base32().encode(rand);
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}
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private static SecureRandom initSecureRandom() {
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try {
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return SecureRandom.getInstance("NativePRNG");
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} catch (NoSuchAlgorithmException e) {
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throw new ProviderException(e);
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}
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}
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/** Sets the HTTP Basic Authentication header on an {@link HTTPRequest}. */
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public static void setAuthorizationHeader(HTTPRequest req, Optional<String> login) {
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if (login.isPresent()) {
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String token = base64().encode(login.get().getBytes(UTF_8));
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req.addHeader(new HTTPHeader(AUTHORIZATION, "Basic " + token));
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}
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}
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}
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