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/*
* Copyright (c) 2002-2023 Gargoyle Software Inc.
*
* 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
* https://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 org.htmlunit.util;
import static java.nio.charset.StandardCharsets.US_ASCII;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLEncoder;
import java.net.URLStreamHandler;
import java.nio.charset.Charset;
import java.util.BitSet;
import java.util.Locale;
import java.util.Objects;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.net.URLCodec;
import org.htmlunit.WebAssert;
import org.htmlunit.protocol.AnyHandler;
import org.htmlunit.protocol.javascript.JavaScriptURLConnection;
/**
* URL utilities class that makes it easy to create new URLs based off of old URLs
* without having to assemble or parse them yourself.
*
* @author Daniel Gredler
* @author Martin Tamme
* @author Sudhan Moghe
* @author Marc Guillemot
* @author Ahmed Ashour
* @author Ronald Brill
* @author Joerg Werner
* @author Hartmut Arlt
*/
public final class UrlUtils {
/** "about". */
public static final String ABOUT = "about";
/** "about:". */
public static final String ABOUT_SCHEME = ABOUT + ":";
/** "about:blank". */
public static final String ABOUT_BLANK = ABOUT_SCHEME + "blank";
/** URL for "about:blank". */
public static final URL URL_ABOUT_BLANK;
private static final URLStreamHandler JS_HANDLER;
private static final URLStreamHandler ABOUT_HANDLER;
private static final URLStreamHandler DATA_HANDLER;
private static final BitSet PATH_ALLOWED_CHARS = new BitSet(256);
private static final BitSet QUERY_ALLOWED_CHARS = new BitSet(256);
private static final BitSet ANCHOR_ALLOWED_CHARS = new BitSet(256);
private static final BitSet HASH_ALLOWED_CHARS = new BitSet(256);
/*
URI allowed char initialization; based on HttpClient 3.1's URI bit sets.
*/
static {
// make sure the handlers are available first (before calling toUrlSafe())
JS_HANDLER = new org.htmlunit.protocol.javascript.Handler();
ABOUT_HANDLER = new org.htmlunit.protocol.about.Handler();
DATA_HANDLER = new org.htmlunit.protocol.data.Handler();
try {
URL_ABOUT_BLANK = new URL(null, ABOUT_BLANK, ABOUT_HANDLER);
}
catch (final MalformedURLException e) {
// should never happen
throw new RuntimeException(e);
}
final BitSet reserved = new BitSet(256);
reserved.set(';');
reserved.set('/');
reserved.set('?');
reserved.set(':');
reserved.set('@');
reserved.set('&');
reserved.set('=');
reserved.set('+');
reserved.set('$');
reserved.set(',');
final BitSet mark = new BitSet(256);
mark.set('-');
mark.set('_');
mark.set('.');
mark.set('!');
mark.set('~');
mark.set('*');
mark.set('\'');
mark.set('(');
mark.set(')');
final BitSet alpha = new BitSet(256);
for (int i = 'a'; i <= 'z'; i++) {
alpha.set(i);
}
for (int i = 'A'; i <= 'Z'; i++) {
alpha.set(i);
}
final BitSet digit = new BitSet(256);
for (int i = '0'; i <= '9'; i++) {
digit.set(i);
}
final BitSet alphanumeric = new BitSet(256);
alphanumeric.or(alpha);
alphanumeric.or(digit);
final BitSet unreserved = new BitSet(256);
unreserved.or(alphanumeric);
unreserved.or(mark);
final BitSet hex = new BitSet(256);
hex.or(digit);
for (int i = 'a'; i <= 'f'; i++) {
hex.set(i);
}
for (int i = 'A'; i <= 'F'; i++) {
hex.set(i);
}
final BitSet escaped = new BitSet(256);
escaped.set('%');
escaped.or(hex);
final BitSet uric = new BitSet(256);
uric.or(reserved);
uric.or(unreserved);
uric.or(escaped);
final BitSet pchar = new BitSet(256);
pchar.or(unreserved);
pchar.or(escaped);
pchar.set(':');
pchar.set('@');
pchar.set('&');
pchar.set('=');
pchar.set('+');
pchar.set('$');
pchar.set(',');
final BitSet segment = new BitSet(256);
segment.or(pchar);
segment.set(';');
segment.or(pchar);
final BitSet pathSegments = new BitSet(256);
pathSegments.set('/');
pathSegments.or(segment);
final BitSet absPath = new BitSet(256);
absPath.set('/');
absPath.or(pathSegments);
final BitSet allowedAbsPath = new BitSet(256);
allowedAbsPath.or(absPath);
final BitSet allowedFragment = new BitSet(256);
allowedFragment.or(uric);
final BitSet allowedQuery = new BitSet(256);
allowedQuery.or(uric);
final BitSet allowedHash = new BitSet(256);
allowedHash.or(uric);
PATH_ALLOWED_CHARS.or(allowedAbsPath);
QUERY_ALLOWED_CHARS.or(allowedQuery);
ANCHOR_ALLOWED_CHARS.or(allowedFragment);
HASH_ALLOWED_CHARS.or(allowedHash);
}
/**
* Disallow instantiation of this class.
*/
private UrlUtils() {
// Empty.
}
/**
* Constructs a URL instance based on the specified URL string, taking into account the fact that the
* specified URL string may represent an "about:..." URL, a "javascript:..." URL, or
* a data:... URL.
*
* The caller should be sure that URL strings passed to this method will parse correctly as URLs, as
* this method never expects to have to handle {@link MalformedURLException}s.
*
* @param url the URL string to convert into a URL instance
* @return the constructed URL instance
*/
public static URL toUrlSafe(final String url) {
try {
return toUrlUnsafe(url);
}
catch (final MalformedURLException e) {
// Should never happen.
throw new RuntimeException(e);
}
}
/**
* Constructs a URL instance based on the specified URL string, taking into account the fact that the
* specified URL string may represent an "about:..." URL, a "javascript:..." URL, or
* a data:... URL.
*
* Unlike {@link #toUrlSafe(String)}, the caller need not be sure that URL strings passed to this
* method will parse correctly as URLs.
*
* @param url the URL string to convert into a URL instance
* @return the constructed URL instance
* @throws MalformedURLException if the URL string cannot be converted to a URL instance
*/
public static URL toUrlUnsafe(final String url) throws MalformedURLException {
WebAssert.notNull("url", url);
final String protocol = org.apache.commons.lang3.StringUtils.substringBefore(url, ":").toLowerCase(Locale.ROOT);
if (protocol.isEmpty() || UrlUtils.isNormalUrlProtocol(protocol)) {
final URL response = new URL(url);
if (response.getProtocol().startsWith("http")
&& org.apache.commons.lang3.StringUtils.isEmpty(response.getHost())) {
throw new MalformedURLException("Missing host name in url: " + url);
}
return response;
}
if (JavaScriptURLConnection.JAVASCRIPT_PREFIX.equals(protocol + ":")) {
return new URL(null, url, JS_HANDLER);
}
if (ABOUT.equals(protocol)) {
if (org.apache.commons.lang3.StringUtils.equalsIgnoreCase(ABOUT_BLANK, url)) {
return URL_ABOUT_BLANK;
}
return new URL(null, url, ABOUT_HANDLER);
}
if ("data".equals(protocol)) {
return new URL(null, url, DATA_HANDLER);
}
return new URL(null, url, AnyHandler.INSTANCE);
}
/**
* Encodes illegal characters in the specified URL's path, query string and anchor according to the URL
* encoding rules observed in real browsers.
*
* For example, this method changes
* "http://first/?a=b c" to "http://first/?a=b%20c".
*
* @param url the URL to encode
* @param minimalQueryEncoding whether or not to perform minimal query encoding, like IE does
* @param charset the charset
* @return the encoded URL
*/
public static URL encodeUrl(final URL url, final boolean minimalQueryEncoding, final Charset charset) {
if (!isNormalUrlProtocol(url.getProtocol())) {
return url; // javascript:, about:, data: and anything not supported like foo:
}
try {
String path = url.getPath();
if (path != null) {
path = encode(path, PATH_ALLOWED_CHARS, UTF_8);
}
String query = url.getQuery();
if (query != null) {
if (minimalQueryEncoding) {
query = org.apache.commons.lang3.StringUtils.replace(query, " ", "%20");
}
else {
query = encode(query, QUERY_ALLOWED_CHARS, charset);
}
}
String anchor = url.getRef();
if (anchor != null) {
anchor = encode(anchor, ANCHOR_ALLOWED_CHARS, UTF_8);
}
return createNewUrl(url.getProtocol(), url.getUserInfo(), url.getHost(),
url.getPort(), path, anchor, query);
}
catch (final MalformedURLException e) {
// Impossible... I think.
throw new RuntimeException(e);
}
}
/**
* Encodes and escapes the specified URI anchor string.
*
* @param anchor the anchor string to encode and escape
* @return the encoded and escaped anchor string
*/
public static String encodeAnchor(final String anchor) {
if (anchor == null) {
return null;
}
return encode(anchor, ANCHOR_ALLOWED_CHARS, UTF_8);
}
/**
* Encodes and escapes the specified URI hash string.
*
* @param hash the anchor string to encode and escape
* @return the encoded and escaped hash string
*/
public static String encodeHash(final String hash) {
if (hash == null) {
return null;
}
return encode(hash, HASH_ALLOWED_CHARS, UTF_8);
}
/**
* Encodes and escapes the specified URI hash string.
*
* @param query the query string to encode and escape
* @return the encoded and escaped hash string
*/
public static String encodeQuery(final String query) {
if (query == null) {
return null;
}
return encode(query, QUERY_ALLOWED_CHARS, UTF_8);
}
/**
* Unescapes and decodes the specified string.
*
* @param escaped the string to be unescaped and decoded
* @return the unescaped and decoded string
*/
public static String decode(final String escaped) {
try {
final byte[] bytes = escaped.getBytes(US_ASCII);
final byte[] bytes2 = URLCodec.decodeUrl(bytes);
return new String(bytes2, UTF_8);
}
catch (final DecoderException e) {
// Should never happen.
throw new RuntimeException(e);
}
}
/**
* Escapes and encodes the specified string. Based on HttpClient 3.1's URIUtil.encode() method.
*
* @param unescaped the string to encode
* @param allowed allowed characters that shouldn't be escaped
* @param charset the charset to use
* @return the escaped string
*/
private static String encode(final String unescaped, final BitSet allowed, final Charset charset) {
final byte[] bytes = unescaped.getBytes(charset);
final byte[] bytes2 = URLCodec.encodeUrl(allowed, bytes);
return encodePercentSign(bytes2);
}
/**
* Encodes every occurrence of the escape character '%' in the given input
* string that is not followed by two hexadecimal characters.
* @param input the input bytes
* @return the given input string where every occurrence of % in
* invalid escape sequences has been replace by %25
*/
@SuppressWarnings("PMD.UselessParentheses")
private static String encodePercentSign(final byte[] input) {
if (input == null) {
return null;
}
final StringBuilder result = new StringBuilder(new String(input, US_ASCII));
int state = -0;
int offset = 0;
for (int i = 0; i < input.length; i++) {
final byte b = input[i];
if (state == 0 && b == '%') {
state = 1;
}
else if (state == 1 || state == 2) {
if (('0' <= b && b <= '9')
|| ('A' <= b && b <= 'F')
|| ('a' <= b && b <= 'f')) {
state++;
if (state == 3) {
state = 0;
}
}
else {
final int st = i - state + offset;
result.replace(st, st + 1, "%25");
offset = offset + 2;
state = b == '%' ? 1 : 0;
}
}
}
if (state == 1 || state == 2) {
final int st = input.length - state + offset;
result.replace(st, st + 1, "%25");
}
return result.toString();
}
/**
* Creates and returns a new URL using only the protocol and authority from the given one.
* @param u the URL on which to base the returned URL
* @return a new URL using only the protocol and authority from the given one
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithoutPathRefQuery(final URL u) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), null, null, null);
}
/**
* Creates and returns a new URL using only the protocol, authority and path
* from the given one.
* @param u the URL on which to base the returned URL
* @return a new URL using only the protocol and authority from the given one
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithoutRef(final URL u) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), u.getPath(), null, u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified protocol.
* @param u the URL on which to base the returned URL
* @param newProtocol the new protocol to use in the returned URL
* @return a new URL identical to the specified URL, except using the specified protocol
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewProtocol(final URL u, final String newProtocol) throws MalformedURLException {
return createNewUrl(newProtocol, u.getAuthority(), u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified host.
* @param u the URL on which to base the returned URL
* @param newHost the new host to use in the returned URL
* @return a new URL identical to the specified URL, except using the specified host
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewHost(final URL u, final String newHost)
throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getUserInfo(), newHost,
u.getPort(), u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified host.
* @param u the URL on which to base the returned URL
* @param newHost the new host to use in the returned URL
* @param newPort the new port to use in the returned URL
* @return a new URL identical to the specified URL, except using the specified host
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewHostAndPort(final URL u, final String newHost, final int newPort)
throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getUserInfo(), newHost, newPort, u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified port.
* @param u the URL on which to base the returned URL
* @param newPort the new port to use in the returned URL or -1 to remove it
* @return a new URL identical to the specified URL, except using the specified port
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewPort(final URL u, final int newPort) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getUserInfo(), u.getHost(),
newPort, u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified path.
* @param u the URL on which to base the returned URL
* @param newPath the new path to use in the returned URL
* @return a new URL identical to the specified URL, except using the specified path
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewPath(final URL u, final String newPath) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), newPath, u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified reference.
* @param u the URL on which to base the returned URL
* @param newRef the new reference to use in the returned URL or null to remove it
* @return a new URL identical to the specified URL, except using the specified reference
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewRef(final URL u, final String newRef) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), u.getPath(), newRef, u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL, except using the specified query string.
* @param u the URL on which to base the returned URL
* @param newQuery the new query string to use in the returned URL
* @return a new URL identical to the specified URL, except using the specified query string
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewQuery(final URL u, final String newQuery) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), u.getPath(), u.getRef(), newQuery);
}
/**
* Creates and returns a new URL identical to the specified URL, ignoring path, protocol and query.
* @param u the URL on which to base the returned URL
* @return a new URL identical to the specified URL, ignoring path, protocol and query
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithProtocolAndAuthority(final URL u) throws MalformedURLException {
return createNewUrl(u.getProtocol(), u.getAuthority(), null, null, null);
}
/**
* Creates and returns a new URL identical to the specified URL but with a changed user name.
* @param u the URL on which to base the returned URL
* @param newUserName the new user name or null to remove it
* @return a new URL identical to the specified URL; only user name updated
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewUserName(final URL u, final String newUserName) throws MalformedURLException {
String newUserInfo = newUserName == null ? "" : newUserName;
final String userInfo = u.getUserInfo();
if (org.apache.commons.lang3.StringUtils.isNotBlank(userInfo)) {
final int colonIdx = userInfo.indexOf(':');
if (colonIdx > -1) {
newUserInfo = newUserInfo + userInfo.substring(colonIdx);
}
}
return createNewUrl(u.getProtocol(), newUserInfo.isEmpty() ? null : newUserInfo,
u.getHost(), u.getPort(), u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates and returns a new URL identical to the specified URL but with a changed user password.
* @param u the URL on which to base the returned URL
* @param newUserPassword the new user password or null to remove it
* @return a new URL identical to the specified URL; only user name updated
* @throws MalformedURLException if there is a problem creating the new URL
*/
public static URL getUrlWithNewUserPassword(final URL u, final String newUserPassword)
throws MalformedURLException {
String newUserInfo = newUserPassword == null ? "" : ':' + newUserPassword;
final String userInfo = u.getUserInfo();
if (org.apache.commons.lang3.StringUtils.isNotBlank(userInfo)) {
final int colonIdx = userInfo.indexOf(':');
if (colonIdx > -1) {
newUserInfo = userInfo.substring(0, colonIdx) + newUserInfo;
}
else {
newUserInfo = userInfo + newUserInfo;
}
}
return createNewUrl(u.getProtocol(), newUserInfo.isEmpty() ? null : newUserInfo,
u.getHost(), u.getPort(), u.getPath(), u.getRef(), u.getQuery());
}
/**
* Creates a new URL based on the specified fragments.
* @param protocol the protocol to use (may not be {@code null})
* @param userInfo the user info to use (may be {@code null})
* @param host the host to use (may not be {@code null})
* @param port the port to use (may be -1 if no port is specified)
* @param path the path to use (may be {@code null} and may omit the initial '/')
* @param ref the reference to use (may be {@code null} and must not include the '#')
* @param query the query to use (may be {@code null} and must not include the '?')
* @return a new URL based on the specified fragments
* @throws MalformedURLException if there is a problem creating the new URL
*/
private static URL createNewUrl(final String protocol, final String userInfo, final String host, final int port,
final String path, final String ref, final String query) throws MalformedURLException {
final StringBuilder s = new StringBuilder();
s.append(protocol).append("://");
if (userInfo != null) {
s.append(userInfo).append('@');
}
s.append(host);
if (port != -1) {
s.append(':').append(port);
}
if (path != null && !path.isEmpty()) {
if ('/' != path.charAt(0)) {
s.append('/');
}
s.append(path);
}
if (query != null) {
s.append('?').append(query);
}
if (ref != null) {
if (ref.isEmpty() || ref.charAt(0) != '#') {
s.append('#');
}
s.append(ref);
}
return new URL(s.toString());
}
/**
* Creates a new URL based on the specified fragments.
* @param protocol the protocol to use (may not be {@code null})
* @param authority the authority to use (may not be {@code null})
* @param path the path to use (may be {@code null} and may omit the initial '/')
* @param ref the reference to use (may be {@code null} and must not include the '#')
* @param query the query to use (may be {@code null} and must not include the '?')
* @return a new URL based on the specified fragments
* @throws MalformedURLException if there is a problem creating the new URL
*/
private static URL createNewUrl(final String protocol, final String authority,
final String path, final String ref, final String query) throws MalformedURLException {
// pre-compute length of StringBuilder
int len = protocol.length() + 1;
if (authority != null && !authority.isEmpty()) {
len += 2 + authority.length();
}
if (path != null) {
len += path.length();
}
if (query != null) {
len += 1 + query.length();
}
if (ref != null) {
len += 1 + ref.length();
}
final StringBuilder s = new StringBuilder(len);
s.append(protocol).append(':');
if (authority != null && !authority.isEmpty()) {
s.append("//");
s.append(authority);
}
if (path != null) {
s.append(path);
}
if (query != null) {
s.append('?');
s.append(query);
}
if (ref != null) {
if (ref.isEmpty() || ref.charAt(0) != '#') {
s.append('#');
}
s.append(ref);
}
return toUrlSafe(s.toString());
}
/**
* Resolves a given relative URL against a base URL. See
* RFC1808
* Section 4 for more details.
*
* @param baseUrl The base URL in which to resolve the specification.
* @param relativeUrl The relative URL to resolve against the base URL.
* @return the resolved specification.
*/
public static String resolveUrl(final String baseUrl, final String relativeUrl) {
if (baseUrl == null) {
throw new IllegalArgumentException("Base URL must not be null");
}
if (relativeUrl == null) {
throw new IllegalArgumentException("Relative URL must not be null");
}
final Url url = resolveUrl(parseUrl(baseUrl), relativeUrl);
return url.toString();
}
/**
* Resolves a given relative URL against a base URL. See
* RFC1808
* Section 4 for more details.
*
* @param baseUrl The base URL in which to resolve the specification.
* @param relativeUrl The relative URL to resolve against the base URL.
* @return the resolved specification.
*/
public static String resolveUrl(final URL baseUrl, final String relativeUrl) {
if (baseUrl == null) {
throw new IllegalArgumentException("Base URL must not be null");
}
return resolveUrl(baseUrl.toExternalForm(), relativeUrl);
}
/**
* Parses a given specification using the algorithm depicted in
* RFC1808:
*
* Section 2.4: Parsing a URL
*
* An accepted method for parsing URLs is useful to clarify the
* generic-RL syntax of Section 2.2 and to describe the algorithm for
* resolving relative URLs presented in Section 4. This section
* describes the parsing rules for breaking down a URL (relative or
* absolute) into the component parts described in Section 2.1. The
* rules assume that the URL has already been separated from any
* surrounding text and copied to a "parse string". The rules are
* listed in the order in which they would be applied by the parser.
*
* @param spec The specification to parse.
* @return the parsed specification.
*/
@SuppressWarnings("PMD.UselessParentheses")
private static Url parseUrl(String spec) {
final Url url = new Url();
int startIndex = 0;
int endIndex = spec.length();
// see https://url.spec.whatwg.org/#concept-basic-url-parser
// * If input contains any leading or trailing C0 control or space, validation error.
// Remove any leading and trailing C0 control or space from input.
// * If input contains any ASCII tab or newline, validation error.
// Remove all ASCII tab or newline from input.
if (endIndex > startIndex) {
StringBuilder sb = null;
boolean before = true;
int trailing = 0;
for (int i = 0; i < endIndex; i++) {
final char c = spec.charAt(i);
boolean remove = false;
if (c == '\t' | c == '\r' | c == '\n') {
remove = true;
}
else if ('\u0000' <= c && c <= '\u0020') {
if (before) {
remove = true;
}
else {
trailing++;
}
}
else {
before &= false;
trailing = 0;
}
if (remove) {
if (sb == null) {
sb = new StringBuilder(spec.substring(0, i));
}
}
else if (sb != null) {
sb.append(c);
}
}
if (sb == null) {
if (trailing > 0) {
endIndex = spec.length() - trailing;
spec = spec.substring(0, endIndex);
}
}
else {
if (trailing > 0) {
spec = sb.substring(0, sb.length() - trailing);
}
else {
spec = sb.toString();
}
endIndex = spec.length();
}
}
// Section 2.4.1: Parsing the Fragment Identifier
//
// If the parse string contains a crosshatch "#" character, then the
// substring after the first (left-most) crosshatch "#" and up to the
// end of the parse string is the identifier. If the
// crosshatch is the last character, or no crosshatch is present, then
// the fragment identifier is empty. The matched substring, including
// the crosshatch character, is removed from the parse string before
// continuing.
//
// Note that the fragment identifier is not considered part of the URL.
// However, since it is often attached to the URL, parsers must be able
// to recognize and set aside fragment identifiers as part of the
// process.
final int crosshatchIndex = StringUtils.indexOf(spec, '#', startIndex, endIndex);
if (crosshatchIndex >= 0) {
url.fragment_ = spec.substring(crosshatchIndex + 1, endIndex);
endIndex = crosshatchIndex;
}
// Section 2.4.2: Parsing the Scheme
//
// If the parse string contains a colon ":" after the first character
// and before any characters not allowed as part of a scheme name (i.e.,
// any not an alphanumeric, plus "+", period ".", or hyphen "-"), the
// of the URL is the substring of characters up to but not
// including the first colon. These characters and the colon are then
// removed from the parse string before continuing.
final int colonIndex = StringUtils.indexOf(spec, ':', startIndex, endIndex);
if (colonIndex > 0) {
final String scheme = spec.substring(startIndex, colonIndex);
if (isValidScheme(scheme)) {
url.scheme_ = scheme;
startIndex = colonIndex + 1;
}
}
// Section 2.4.3: Parsing the Network Location/Login
//
// If the parse string begins with a double-slash "//", then the
// substring of characters after the double-slash and up to, but not
// including, the next slash "/" character is the network location/login
// () of the URL. If no trailing slash "/" is present, the
// entire remaining parse string is assigned to . The double-
// slash and are removed from the parse string before
// continuing.
//
// Note: We also accept a question mark "?" or a semicolon ";" character as
// delimiters for the network location/login () of the URL.
final int locationStartIndex;
int locationEndIndex;
if (spec.startsWith("//", startIndex)) {
locationStartIndex = startIndex + 2;
locationEndIndex = StringUtils.indexOf(spec, '/', locationStartIndex, endIndex);
if (locationEndIndex >= 0) {
startIndex = locationEndIndex;
}
}
else {
locationStartIndex = -1;
locationEndIndex = -1;
}
// Section 2.4.4: Parsing the Query Information
//
// If the parse string contains a question mark "?" character, then the
// substring after the first (left-most) question mark "?" and up to the
// end of the parse string is the information. If the question
// mark is the last character, or no question mark is present, then the
// query information is empty. The matched substring, including the
// question mark character, is removed from the parse string before
// continuing.
final int questionMarkIndex = StringUtils.indexOf(spec, '?', startIndex, endIndex);
if (questionMarkIndex >= 0) {
if ((locationStartIndex >= 0) && (locationEndIndex < 0)) {
// The substring of characters after the double-slash and up to, but not
// including, the question mark "?" character is the network location/login
// () of the URL.
locationEndIndex = questionMarkIndex;
startIndex = questionMarkIndex;
}
url.query_ = spec.substring(questionMarkIndex + 1, endIndex);
endIndex = questionMarkIndex;
}
// Section 2.4.5: Parsing the Parameters
//
// If the parse string contains a semicolon ";" character, then the
// substring after the first (left-most) semicolon ";" and up to the end
// of the parse string is the parameters (). If the semicolon
// is the last character, or no semicolon is present, then is
// empty. The matched substring, including the semicolon character, is
// removed from the parse string before continuing.
final int semicolonIndex = StringUtils.indexOf(spec, ';', startIndex, endIndex);
if (semicolonIndex >= 0) {
if ((locationStartIndex >= 0) && (locationEndIndex < 0)) {
// The substring of characters after the double-slash and up to, but not
// including, the semicolon ";" character is the network location/login
// () of the URL.
locationEndIndex = semicolonIndex;
startIndex = semicolonIndex;
}
url.parameters_ = spec.substring(semicolonIndex + 1, endIndex);
endIndex = semicolonIndex;
}
// Section 2.4.6: Parsing the Path
//
// After the above steps, all that is left of the parse string is the
// URL and the slash "/" that may precede it. Even though the
// initial slash is not part of the URL path, the parser must remember
// whether or not it was present so that later processes can
// differentiate between relative and absolute paths. Often this is
// done by simply storing the preceding slash along with the path.
if ((locationStartIndex >= 0) && (locationEndIndex < 0)) {
// The entire remaining parse string is assigned to the network
// location/login () of the URL.
locationEndIndex = endIndex;
}
else if (startIndex < endIndex) {
url.path_ = spec.substring(startIndex, endIndex);
}
// Set the network location/login () of the URL.
if ((locationStartIndex >= 0) && (locationEndIndex >= 0)) {
url.location_ = spec.substring(locationStartIndex, locationEndIndex);
}
return url;
}
/**
* Returns true if specified string is a valid scheme name.
*
* https://tools.ietf.org/html/rfc1738
*
* Scheme names consist of a sequence of characters. The lower case
* letters "a"--"z", digits, and the characters plus ("+"), period
* ("."), and hyphen ("-") are allowed. For resiliency, programs
* interpreting URLs should treat upper case letters as equivalent to
* lower case in scheme names (e.g., allow "HTTP" as well as "http").
*
* @param scheme the scheme string to check
* @return true if valid
*/
@SuppressWarnings("PMD.UselessParentheses")
public static boolean isValidScheme(final String scheme) {
final int length = scheme.length();
if (length < 1) {
return false;
}
char c = scheme.charAt(0);
boolean isValid = ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
if (!isValid) {
return false;
}
for (int i = 1; i < length; i++) {
c = scheme.charAt(i);
isValid =
('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')
|| ('0' <= c && c <= '9')
|| c == '+'
|| c == '.'
|| c == '-';
if (!isValid) {
return false;
}
}
return true;
}
/**
* Resolves a given relative URL against a base URL using the algorithm
* depicted in RFC1808:
*
* Section 4: Resolving Relative URLs
*
* This section describes an example algorithm for resolving URLs within
* a context in which the URLs may be relative, such that the result is
* always a URL in absolute form. Although this algorithm cannot
* guarantee that the resulting URL will equal that intended by the
* original author, it does guarantee that any valid URL (relative or
* absolute) can be consistently transformed to an absolute form given a
* valid base URL.
*
* @param baseUrl The base URL in which to resolve the specification.
* @param relativeUrl The relative URL to resolve against the base URL.
* @return the resolved specification.
*/
private static Url resolveUrl(final Url baseUrl, final String relativeUrl) {
final Url url = parseUrl(relativeUrl);
// Step 1: The base URL is established according to the rules of
// Section 3. If the base URL is the empty string (unknown),
// the embedded URL is interpreted as an absolute URL and
// we are done.
if (baseUrl == null) {
return url;
}
// Step 2: Both the base and embedded URLs are parsed into their
// component parts as described in Section 2.4.
// a) If the embedded URL is entirely empty, it inherits the
// entire base URL (i.e., is set equal to the base URL)
// and we are done.
if (relativeUrl.isEmpty()) {
return new Url(baseUrl);
}
// b) If the embedded URL starts with a scheme name, it is
// interpreted as an absolute URL and we are done.
if (url.scheme_ != null) {
return url;
}
// c) Otherwise, the embedded URL inherits the scheme of
// the base URL.
url.scheme_ = baseUrl.scheme_;
// Step 3: If the embedded URL's is non-empty, we skip to
// Step 7. Otherwise, the embedded URL inherits the
// (if any) of the base URL.
if (url.location_ != null) {
return url;
}
url.location_ = baseUrl.location_;
// Step 4: If the embedded URL path is preceded by a slash "/", the
// path is not relative and we skip to Step 7.
if (url.path_ != null && !url.path_.isEmpty() && url.path_.charAt(0) == '/') {
url.path_ = removeLeadingSlashPoints(url.path_);
return url;
}
// Step 5: If the embedded URL path is empty (and not preceded by a
// slash), then the embedded URL inherits the base URL path,
// and
if (url.path_ == null) {
url.path_ = baseUrl.path_;
// a) if the embedded URL's is non-empty, we skip to
// step 7; otherwise, it inherits the of the base
// URL (if any) and
if (url.parameters_ != null) {
return url;
}
url.parameters_ = baseUrl.parameters_;
// b) if the embedded URL's is non-empty, we skip to
// step 7; otherwise, it inherits the of the base
// URL (if any) and we skip to step 7.
if (url.query_ != null) {
return url;
}
url.query_ = baseUrl.query_;
return url;
}
// Step 6: The last segment of the base URL's path (anything
// following the rightmost slash "/", or the entire path if no
// slash is present) is removed and the embedded URL's path is
// appended in its place. The following operations are
// then applied, in order, to the new path:
final String basePath = baseUrl.path_;
String path = "";
if (basePath == null) {
path = "/";
}
else {
final int lastSlashIndex = basePath.lastIndexOf('/');
if (lastSlashIndex >= 0) {
path = basePath.substring(0, lastSlashIndex + 1);
}
}
path = path.concat(url.path_);
// a) All occurrences of "./", where "." is a complete path
// segment, are removed.
int pathSegmentIndex;
while ((pathSegmentIndex = path.indexOf("/./")) >= 0) {
path = path.substring(0, pathSegmentIndex + 1).concat(path.substring(pathSegmentIndex + 3));
}
// b) If the path ends with "." as a complete path segment,
// that "." is removed.
if (path.endsWith("/.")) {
path = path.substring(0, path.length() - 1);
}
// c) All occurrences of "/../", where is a
// complete path segment not equal to "..", are removed.
// Removal of these path segments is performed iteratively,
// removing the leftmost matching pattern on each iteration,
// until no matching pattern remains.
while ((pathSegmentIndex = path.indexOf("/../")) > 0) {
final String pathSegment = path.substring(0, pathSegmentIndex);
final int slashIndex = pathSegment.lastIndexOf('/');
if (slashIndex >= 0) {
if (!"..".equals(pathSegment.substring(slashIndex))) {
path = path.substring(0, slashIndex + 1).concat(path.substring(pathSegmentIndex + 4));
}
}
else {
path = path.substring(pathSegmentIndex + 4);
}
}
// d) If the path ends with "/..", where is a
// complete path segment not equal to "..", that
// "/.." is removed.
if (path.endsWith("/..")) {
final String pathSegment = path.substring(0, path.length() - 3);
final int slashIndex = pathSegment.lastIndexOf('/');
if (slashIndex >= 0) {
path = path.substring(0, slashIndex + 1);
}
}
path = removeLeadingSlashPoints(path);
url.path_ = path;
// Step 7: The resulting URL components, including any inherited from
// the base URL, are recombined to give the absolute form of
// the embedded URL.
return url;
}
/**
* "../" after the leading "/" should be removed as browsers do (not in RFC)
*/
private static String removeLeadingSlashPoints(final String path) {
int i = 1;
while (path.startsWith("../", i)) {
i = i + 3;
}
if (i > 1) {
return "/" + path.substring(i);
}
return path;
}
/**
* Class Url represents a Uniform Resource Locator.
*
* @author Martin Tamme
*/
private static class Url {
private String scheme_;
private String location_;
private String path_;
private String parameters_;
private String query_;
private String fragment_;
/**
* Creates a Url object.
*/
Url() {
}
/**
* Creates a Url object from the specified
* Url object.
*
* @param url a Url object.
*/
Url(final Url url) {
scheme_ = url.scheme_;
location_ = url.location_;
path_ = url.path_;
parameters_ = url.parameters_;
query_ = url.query_;
fragment_ = url.fragment_;
}
/**
* Returns a string representation of the Url object.
*
* @return a string representation of the Url object.
*/
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
if (scheme_ != null) {
sb.append(scheme_);
sb.append(':');
}
if (location_ != null) {
sb.append("//");
sb.append(location_);
}
if (path_ != null) {
sb.append(path_);
}
if (parameters_ != null) {
sb.append(';');
sb.append(parameters_);
}
if (query_ != null) {
sb.append('?');
sb.append(query_);
}
if (fragment_ != null) {
sb.append('#');
sb.append(fragment_);
}
return sb.toString();
}
}
static boolean isNormalUrlProtocol(final String protocol) {
return "http".equals(protocol) || "https".equals(protocol) || "file".equals(protocol);
}
/**
* More or less the same as sameFile(URL, URL) but without
* resolving the host to an IP address for comparing.
* Additionally we do some path normalization.
*
* @param u1 a URL object
* @param u2 a URL object
* @return true if u1 and u2 refer to the same file
*/
@SuppressWarnings("PMD.UselessParentheses")
public static boolean sameFile(final URL u1, final URL u2) {
if (u1 == u2) {
return true;
}
if (u1 == null || u2 == null) {
return false;
}
// Compare the protocols.
final String p1 = u1.getProtocol();
final String p2 = u2.getProtocol();
if (!(p1 == p2 || (p1 != null && p1.equalsIgnoreCase(p2)))) {
return false;
}
// Compare the ports.
final int port1 = (u1.getPort() == -1) ? u1.getDefaultPort() : u1.getPort();
final int port2 = (u2.getPort() == -1) ? u2.getDefaultPort() : u2.getPort();
if (port1 != port2) {
return false;
}
// Compare the hosts.
final String h1 = u1.getHost();
final String h2 = u2.getHost();
if (!(h1 == h2 || (h1 != null && h1.equalsIgnoreCase(h2)))) {
return false;
}
// Compare the files.
String f1 = u1.getFile();
if (f1.isEmpty()) {
f1 = "/";
}
String f2 = u2.getFile();
if (f2.isEmpty()) {
f2 = "/";
}
if (f1.indexOf('.') > 0 || f2.indexOf('.') > 0) {
try {
f1 = u1.toURI().normalize().toURL().getFile();
f2 = u2.toURI().normalize().toURL().getFile();
}
catch (final RuntimeException re) {
throw re;
}
catch (final Exception e) {
// ignore
}
}
return Objects.equals(f1, f2);
}
/**
* Helper that constructs a normalized url string
* usable as cache key.
*
* @param url a URL object
* @return the normalized string
*/
public static String normalize(final URL url) {
final StringBuilder result = new StringBuilder();
result.append(url.getProtocol())
.append("://")
.append(url.getHost())
.append(':')
.append((url.getPort() == -1) ? url.getDefaultPort() : url.getPort());
// Compare the files.
String f = url.getFile();
if (f.isEmpty()) {
result.append('/');
}
else {
if (f.indexOf('.') > 0) {
try {
f = url.toURI().normalize().toURL().getFile();
}
catch (final Exception e) {
// ignore
}
}
result.append(f);
}
return result.toString();
}
/**
* Constructs a {@link URI} using the specified URL.
*
* @param url the URL
* @param query the query
*
* @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
* @return the URI
*/
public static URI toURI(final URL url, final String query) throws URISyntaxException {
final String scheme = url.getProtocol();
final String host = url.getHost();
final int port = url.getPort();
final String path = url.getPath();
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.isEmpty() || path.charAt(0) != '/') {
buffer.append('/');
}
if (path != null) {
buffer.append(path);
}
if (query != null) {
buffer.append('?');
buffer.append(query);
}
return new URI(buffer.toString());
}
/**
* @param part the part to encode
* @return the ecoded string
*/
public static String encodeQueryPart(final String part) {
if (part == null || part.isEmpty()) {
return "";
}
try {
return URLEncoder.encode(part, "UTF-8");
}
catch (final UnsupportedEncodingException e) {
return part;
}
}
/**
* Removes the well known ports if it can be deduced from protocol.
* @param url the url to clean up
* @return a new URL without the port or the given one
* @throws MalformedURLException if the URL string cannot be converted to a URL instance
*/
public static URL removeRedundantPort(final URL url) throws MalformedURLException {
if (("https".equals(url.getProtocol()) && url.getPort() == 443)
|| ("http".equals(url.getProtocol()) && url.getPort() == 80)) {
return getUrlWithNewPort(url, -1);
}
return url;
}
}