/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.client.utils;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Locale;
import java.util.Stack;
import org.apache.http.HttpHost;
import org.apache.http.annotation.Immutable;
import org.apache.http.conn.routing.RouteInfo;
import org.apache.http.util.Args;
import org.apache.http.util.TextUtils;
/**
* A collection of utilities for {@link URI URIs}, to workaround
* bugs within the class or for ease-of-use features.
*
* @since 4.0
*/
@Immutable
public class URIUtils {
/**
* Constructs a {@link URI} using all the parameters. This should be
* used instead of
* {@link URI#URI(String, String, String, int, String, String, String)}
* or any of the other URI multi-argument URI constructors.
*
* @param scheme
* Scheme name
* @param host
* Host name
* @param port
* Port number
* @param path
* Path
* @param query
* Query
* @param fragment
* Fragment
*
* @throws URISyntaxException
* If both a scheme and a path are given but the path is
* relative, if the URI string constructed from the given
* components violates RFC 2396, or if the authority
* component of the string is present but cannot be parsed
* as a server-based authority
*
* @deprecated (4.2) use {@link URIBuilder}.
*/
@Deprecated
public static URI createURI(
final String scheme,
final String host,
final int port,
final String path,
final String query,
final String fragment) throws URISyntaxException {
final StringBuilder buffer = new StringBuilder();
if (host != null) {
if (scheme != null) {
buffer.append(scheme);
buffer.append("://");
}
buffer.append(host);
if (port > 0) {
buffer.append(':');
buffer.append(port);
}
}
if (path == null || !path.startsWith("/")) {
buffer.append('/');
}
if (path != null) {
buffer.append(path);
}
if (query != null) {
buffer.append('?');
buffer.append(query);
}
if (fragment != null) {
buffer.append('#');
buffer.append(fragment);
}
return new URI(buffer.toString());
}
/**
* A convenience method for creating a new {@link URI} whose scheme, host
* and port are taken from the target host, but whose path, query and
* fragment are taken from the existing URI. The fragment is only used if
* dropFragment is false. The path is set to "/" if not explicitly specified.
*
* @param uri
* Contains the path, query and fragment to use.
* @param target
* Contains the scheme, host and port to use.
* @param dropFragment
* True if the fragment should not be copied.
*
* @throws URISyntaxException
* If the resulting URI is invalid.
*/
public static URI rewriteURI(
final URI uri,
final HttpHost target,
final boolean dropFragment) throws URISyntaxException {
Args.notNull(uri, "URI");
if (uri.isOpaque()) {
return uri;
}
final URIBuilder uribuilder = new URIBuilder(uri);
if (target != null) {
uribuilder.setScheme(target.getSchemeName());
uribuilder.setHost(target.getHostName());
uribuilder.setPort(target.getPort());
} else {
uribuilder.setScheme(null);
uribuilder.setHost(null);
uribuilder.setPort(-1);
}
if (dropFragment) {
uribuilder.setFragment(null);
}
if (TextUtils.isEmpty(uribuilder.getPath())) {
uribuilder.setPath("/");
}
return uribuilder.build();
}
/**
* A convenience method for
* {@link URIUtils#rewriteURI(URI, HttpHost, boolean)} that always keeps the
* fragment.
*/
public static URI rewriteURI(
final URI uri,
final HttpHost target) throws URISyntaxException {
return rewriteURI(uri, target, false);
}
/**
* A convenience method that creates a new {@link URI} whose scheme, host, port, path,
* query are taken from the existing URI, dropping any fragment or user-information.
* The path is set to "/" if not explicitly specified. The existing URI is returned
* unmodified if it has no fragment or user-information and has a path.
*
* @param uri
* original URI.
* @throws URISyntaxException
* If the resulting URI is invalid.
*/
public static URI rewriteURI(final URI uri) throws URISyntaxException {
Args.notNull(uri, "URI");
if (uri.isOpaque()) {
return uri;
}
final URIBuilder uribuilder = new URIBuilder(uri);
if (uribuilder.getUserInfo() != null) {
uribuilder.setUserInfo(null);
}
if (TextUtils.isEmpty(uribuilder.getPath())) {
uribuilder.setPath("/");
}
if (uribuilder.getHost() != null) {
uribuilder.setHost(uribuilder.getHost().toLowerCase(Locale.ROOT));
}
uribuilder.setFragment(null);
return uribuilder.build();
}
/**
* A convenience method that optionally converts the original {@link java.net.URI} either
* to a relative or an absolute form as required by the specified route.
*
* @param uri
* original URI.
* @throws URISyntaxException
* If the resulting URI is invalid.
*
* @since 4.4
*/
public static URI rewriteURIForRoute(final URI uri, final RouteInfo route) throws URISyntaxException {
if (uri == null) {
return null;
}
if (route.getProxyHost() != null && !route.isTunnelled()) {
// Make sure the request URI is absolute
if (!uri.isAbsolute()) {
final HttpHost target = route.getTargetHost();
return rewriteURI(uri, target, true);
} else {
return rewriteURI(uri);
}
} else {
// Make sure the request URI is relative
if (uri.isAbsolute()) {
return rewriteURI(uri, null, true);
} else {
return rewriteURI(uri);
}
}
}
/**
* Resolves a URI reference against a base URI. Work-around for bug in
* java.net.URI (http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4708535)
*
* @param baseURI the base URI
* @param reference the URI reference
* @return the resulting URI
*/
public static URI resolve(final URI baseURI, final String reference) {
return resolve(baseURI, URI.create(reference));
}
/**
* Resolves a URI reference against a base URI. Work-around for bugs in
* java.net.URI (e.g. http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4708535)
*
* @param baseURI the base URI
* @param reference the URI reference
* @return the resulting URI
*/
public static URI resolve(final URI baseURI, final URI reference){
Args.notNull(baseURI, "Base URI");
Args.notNull(reference, "Reference URI");
final String s = reference.toASCIIString();
if (s.startsWith("?")) {
String baseUri = baseURI.toASCIIString();
final int i = baseUri.indexOf('?');
baseUri = i > -1 ? baseUri.substring(0, i) : baseUri;
return URI.create(baseUri + s);
}
final boolean emptyReference = s.isEmpty();
URI resolved;
if (emptyReference) {
resolved = baseURI.resolve(URI.create("#"));
final String resolvedString = resolved.toASCIIString();
resolved = URI.create(resolvedString.substring(0, resolvedString.indexOf('#')));
} else {
resolved = baseURI.resolve(reference);
}
try {
return normalizeSyntax(resolved);
} catch (final URISyntaxException ex) {
throw new IllegalArgumentException(ex);
}
}
/**
* Removes dot segments according to RFC 3986, section 5.2.4 and
* Syntax-Based Normalization according to RFC 3986, section 6.2.2.
*
* @param uri the original URI
* @return the URI without dot segments
*/
static URI normalizeSyntax(final URI uri) throws URISyntaxException {
if (uri.isOpaque() || uri.getAuthority() == null) {
// opaque and file: URIs
return uri;
}
Args.check(uri.isAbsolute(), "Base URI must be absolute");
final URIBuilder builder = new URIBuilder(uri);
final String path = builder.getPath();
if (path != null && !path.equals("/")) {
final String[] inputSegments = path.split("/");
final Stack<String> outputSegments = new Stack<String>();
for (final String inputSegment : inputSegments) {
if ((inputSegment.isEmpty()) || (".".equals(inputSegment))) {
// Do nothing
} else if ("..".equals(inputSegment)) {
if (!outputSegments.isEmpty()) {
outputSegments.pop();
}
} else {
outputSegments.push(inputSegment);
}
}
final StringBuilder outputBuffer = new StringBuilder();
for (final String outputSegment : outputSegments) {
outputBuffer.append('/').append(outputSegment);
}
if (path.lastIndexOf('/') == path.length() - 1) {
// path.endsWith("/") || path.equals("")
outputBuffer.append('/');
}
builder.setPath(outputBuffer.toString());
}
if (builder.getScheme() != null) {
builder.setScheme(builder.getScheme().toLowerCase(Locale.ROOT));
}
if (builder.getHost() != null) {
builder.setHost(builder.getHost().toLowerCase(Locale.ROOT));
}
return builder.build();
}
/**
* Extracts target host from the given {@link URI}.
*
* @param uri
* @return the target host if the URI is absolute or {@code null} if the URI is
* relative or does not contain a valid host name.
*
* @since 4.1
*/
public static HttpHost extractHost(final URI uri) {
if (uri == null) {
return null;
}
HttpHost target = null;
if (uri.isAbsolute()) {
int port = uri.getPort(); // may be overridden later
String host = uri.getHost();
if (host == null) { // normal parse failed; let's do it ourselves
// authority does not seem to care about the valid character-set for host names
host = uri.getAuthority();
if (host != null) {
// Strip off any leading user credentials
final int at = host.indexOf('@');
if (at >= 0) {
if (host.length() > at+1 ) {
host = host.substring(at+1);
} else {
host = null; // @ on its own
}
}
// Extract the port suffix, if present
if (host != null) {
final int colon = host.indexOf(':');
if (colon >= 0) {
final int pos = colon + 1;
int len = 0;
for (int i = pos; i < host.length(); i++) {
if (Character.isDigit(host.charAt(i))) {
len++;
} else {
break;
}
}
if (len > 0) {
try {
port = Integer.parseInt(host.substring(pos, pos + len));
} catch (final NumberFormatException ex) {
}
}
host = host.substring(0, colon);
}
}
}
}
final String scheme = uri.getScheme();
if (!TextUtils.isBlank(host)) {
try {
target = new HttpHost(host, port, scheme);
} catch (final IllegalArgumentException ignore) {
}
}
}
return target;
}
/**
* Derives the interpreted (absolute) URI that was used to generate the last
* request. This is done by extracting the request-uri and target origin for
* the last request and scanning all the redirect locations for the last
* fragment identifier, then combining the result into a {@link URI}.
*
* @param originalURI
* original request before any redirects
* @param target
* if the last URI is relative, it is resolved against this target,
* or {@code null} if not available.
* @param redirects
* collection of redirect locations since the original request
* or {@code null} if not available.
* @return interpreted (absolute) URI
*/
public static URI resolve(
final URI originalURI,
final HttpHost target,
final List<URI> redirects) throws URISyntaxException {
Args.notNull(originalURI, "Request URI");
final URIBuilder uribuilder;
if (redirects == null || redirects.isEmpty()) {
uribuilder = new URIBuilder(originalURI);
} else {
uribuilder = new URIBuilder(redirects.get(redirects.size() - 1));
String frag = uribuilder.getFragment();
// read interpreted fragment identifier from redirect locations
for (int i = redirects.size() - 1; frag == null && i >= 0; i--) {
frag = redirects.get(i).getFragment();
}
uribuilder.setFragment(frag);
}
// read interpreted fragment identifier from original request
if (uribuilder.getFragment() == null) {
uribuilder.setFragment(originalURI.getFragment());
}
// last target origin
if (target != null && !uribuilder.isAbsolute()) {
uribuilder.setScheme(target.getSchemeName());
uribuilder.setHost(target.getHostName());
uribuilder.setPort(target.getPort());
}
return uribuilder.build();
}
/**
* This class should not be instantiated.
*/
private URIUtils() {
}
}