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106 lines
4.4 KiB
Java
106 lines
4.4 KiB
Java
// Copyright 2017 The Nomulus 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.base.Preconditions.checkState;
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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.Ascii;
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import com.google.common.base.Optional;
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import com.google.common.base.Strings;
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import com.google.common.net.MediaType;
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import java.util.Random;
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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 Random random = new Random();
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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 = Ascii.toLowerCase(name);
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for (HTTPHeader header : hdrs) {
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if (Ascii.toLowerCase(header.getName()).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 <a href="http://www.ietf.org/rfc/rfc2388.txt"> RFC2388 - Returning Values from Forms</a>
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*/
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public static void setPayloadMultipart(
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HTTPRequest request, String name, String filename, MediaType contentType, String data) {
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String boundary = createMultipartBoundary();
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checkState(
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!data.contains(boundary),
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"Multipart data contains autogenerated boundary: %s", boundary);
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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(
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new HTTPHeader(CONTENT_TYPE, format("multipart/form-data; boundary=\"%s\"", 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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// Generate 192 random bits (24 bytes) to produce 192/log_2(64) = 192/6 = 32 base64 digits.
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byte[] rand = new byte[24];
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random.nextBytes(rand);
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// Boundary strings can be up to 70 characters long, so use 30 hyphens plus 32 random digits.
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// See https://tools.ietf.org/html/rfc2046#section-5.1.1
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return Strings.repeat("-", 30) + base64().encode(rand);
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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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