Java tutorial
/* * 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.Iterables; import com.google.common.collect.Multimap; import com.google.common.collect.MultimapBuilder; import com.google.common.net.UrlEscapers; import io.netty.handler.codec.http.QueryStringDecoder; import ratpack.http.HttpUrlBuilder; 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("/"); private String protocol = "http"; private String host = "localhost"; private int port = -1; private final List<String> pathSegments = new LinkedList<>(); private final Multimap<String, Object> params = MultimapBuilder.linkedHashKeys().linkedListValues().build(); private boolean hasTrailingSlash; public DefaultHttpUrlBuilder() { } public DefaultHttpUrlBuilder(URI uri) { this.pathSegments.clear(); //TODO Review I think this is correct or mabye add a reset / clear 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) { Map<String, List<String>> parameters = new QueryStringDecoder(uri).parameters(); for (Map.Entry<String, List<String>> entry : parameters.entrySet()) { if (entry.getKey() != null) { params.putAll(entry.getKey(), entry.getValue()); } } } } @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 path(String path) { Objects.requireNonNull(path, "path must not be null"); Collections.addAll(pathSegments, path.split("/")); return this; } @Override public HttpUrlBuilder segment(String pathSegment, Object... args) { Objects.requireNonNull(pathSegment, "pathSegment must not be null"); if (args.length == 0) { pathSegments.add(pathSegment); } else { pathSegments.add(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<String, ?> params) { for (Map.Entry<String, ?> entry : params.entrySet()) { this.params.put(entry.getKey(), entry.getValue()); } return this; } @Override public HttpUrlBuilder params(Multimap<String, ?> params) { this.params.putAll(params); 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, Iterables.transform(pathSegments, input -> UrlEscapers.urlPathSegmentEscaper().escape(input))); } } private void appendQueryString(StringBuilder stringBuilder) { if (!params.isEmpty()) { stringBuilder.append("?"); Iterator<Map.Entry<String, Object>> parts = params.entries().iterator(); if (parts.hasNext()) { Map.Entry<String, Object> 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<String, Object> 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(); } }