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The core HTTP and composition mechanisms of Ratpack
/*
* Copyright 2014 the original author or authors.
*
* Licensed 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 ratpack.http.internal;
import com.google.common.base.CharMatcher;
import com.google.common.base.Joiner;
import com.google.common.collect.Multimap;
import com.google.common.collect.MultimapBuilder;
import com.google.common.escape.Escaper;
import com.google.common.net.UrlEscapers;
import io.netty.handler.codec.http.QueryStringDecoder;
import ratpack.http.HttpUrlBuilder;
import ratpack.util.MultiValueMap;
import ratpack.util.internal.InternalRatpackError;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.util.*;
public class DefaultHttpUrlBuilder implements HttpUrlBuilder {
private static final CharMatcher HOST_NAME_ILLEGAL_CHARS = CharMatcher.inRange('a', 'z')
.or(CharMatcher.inRange('A', 'Z'))
.or(CharMatcher.inRange('0', '9'))
.or(CharMatcher.anyOf(".-"))
.negate()
.precomputed();
private static final Joiner PATH_JOINER = Joiner.on("/");
public static final Escaper PATH_SEGMENT_ESCAPER = UrlEscapers.urlPathSegmentEscaper();
private String protocol = "http";
private String host = "localhost";
private int port = -1;
private final List pathSegments = new LinkedList<>();
private final Multimap params = MultimapBuilder.linkedHashKeys().linkedListValues().build();
private boolean hasTrailingSlash;
public DefaultHttpUrlBuilder() {
}
public DefaultHttpUrlBuilder(URI uri) {
this.protocol = uri.getScheme();
if (protocol == null) {
protocol = "http";
}
protocol = protocol.toLowerCase();
if (!protocol.equals("http") && !protocol.equals("https")) {
throw new IllegalArgumentException("uri " + uri + " must be a http or https uri");
}
host(uri.getHost());
port(uri.getPort());
String rawPath = uri.getRawPath();
if (rawPath != null && !rawPath.isEmpty() && !rawPath.equals("/")) {
String[] parts = rawPath.substring(1).split("/");
for (String part : parts) {
try {
// have to encode + to stop URLDecoder from treating it as a space (it's only synonymous with %20 in query strings)
String s = part.replaceAll("\\+", "%2B");
segment(URLDecoder.decode(s, "UTF8"));
} catch (UnsupportedEncodingException e) {
throw new InternalRatpackError("UTF8 is not available", e);
}
}
hasTrailingSlash = rawPath.substring(rawPath.length() - 1, rawPath.length()).equals("/");
}
if (uri.getRawQuery() != null) {
new QueryStringDecoder(uri).parameters().forEach(params::putAll);
}
}
@Override
public HttpUrlBuilder secure() {
this.protocol = "https";
return this;
}
@Override
public HttpUrlBuilder host(String host) {
// http://en.wikipedia.org/wiki/Hostname#Restrictions%5Fon%5Fvalid%5Fhost%5Fnames
int indexIn = HOST_NAME_ILLEGAL_CHARS.indexIn(host);
if (indexIn >= 0) {
throw new IllegalArgumentException("character '" + host.charAt(indexIn) + "' of host name '" + host + "' is invalid (only [a-zA-Z0-9.-] are allowed in host names)");
}
this.host = host;
return this;
}
@Override
public HttpUrlBuilder port(int port) {
if (port == 0 || port < -1) {
throw new IllegalArgumentException("port must be greater than 0 or exactly -1, is " + port);
}
this.port = port;
return this;
}
@Override
public HttpUrlBuilder encodedPath(String path) {
Objects.requireNonNull(path, "path must not be null");
Arrays.asList(path.split("/")).forEach(pathSegments::add);
return this;
}
@Override
public HttpUrlBuilder path(String path) {
Objects.requireNonNull(path, "path must not be null");
Arrays.asList(path.split("/")).forEach(this::segment);
return this;
}
@Override
public HttpUrlBuilder segment(String pathSegment, Object... args) {
Objects.requireNonNull(pathSegment, "pathSegment must not be null");
if (args.length == 0) {
pathSegments.add(PATH_SEGMENT_ESCAPER.escape(pathSegment));
} else {
pathSegments.add(PATH_SEGMENT_ESCAPER.escape(String.format(pathSegment, args)));
}
return this;
}
@Override
public HttpUrlBuilder params(String... params) {
int i = 0;
while (i < params.length) {
String key = params[i];
String value = "";
if (++i < params.length) {
value = params[i++];
}
this.params.put(key, value);
}
return this;
}
@Override
public HttpUrlBuilder params(Map params) {
for (Map.Entry entry : params.entrySet()) {
this.params.put(entry.getKey(), entry.getValue());
}
return this;
}
@Override
public HttpUrlBuilder params(Multimap params) {
this.params.putAll(params);
return this;
}
@Override
public HttpUrlBuilder params(MultiValueMap params) {
this.params.putAll(params.asMultimap());
return this;
}
public URI build() {
String string = toString();
try {
return new URI(string);
} catch (URISyntaxException e) {
throw new InternalRatpackError("HttpUriBuilder produced invalid URI: " + toString(), e);
}
}
private void appendPathString(StringBuilder stringBuilder) {
if (!pathSegments.isEmpty()) {
stringBuilder.append("/");
PATH_JOINER.appendTo(stringBuilder, pathSegments);
}
}
private void appendQueryString(StringBuilder stringBuilder) {
if (!params.isEmpty()) {
stringBuilder.append("?");
Iterator> parts = params.entries().iterator();
if (parts.hasNext()) {
Map.Entry entry = parts.next();
stringBuilder.append(UrlEscapers.urlFormParameterEscaper().escape(entry.getKey()));
String value = entry.getValue().toString();
if (value != null && value.length() > 0) {
stringBuilder.append("=");
stringBuilder.append(UrlEscapers.urlFormParameterEscaper().escape(value));
}
while (parts.hasNext()) {
stringBuilder.append("&");
Map.Entry e = parts.next();
stringBuilder.append(UrlEscapers.urlFormParameterEscaper().escape(e.getKey()));
String v = e.getValue().toString();
if (v != null && v.length() > 0) {
stringBuilder.append("=");
stringBuilder.append(UrlEscapers.urlFormParameterEscaper().escape(v));
}
}
}
}
}
@Override
public String toString() {
StringBuilder uri = new StringBuilder(protocol).append("://").append(host);
if (port > -1) {
uri.append(":").append(port);
}
appendPathString(uri);
if (hasTrailingSlash) {
uri.append("/");
}
appendQueryString(uri);
return uri.toString();
}
}