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/*
 * 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.
 */

package org.apache.xerces.util;

import java.io.IOException;
import java.io.Serializable;
import java.util.Locale;

/**********************************************************************
* A class to represent a Uniform Resource Identifier (URI). This class
* is designed to handle the parsing of URIs and provide access to
* the various components (scheme, host, port, userinfo, path, query
* string and fragment) that may constitute a URI.
* 

* Parsing of a URI specification is done according to the URI * syntax described in * RFC 2396, * and amended by * RFC 2732. *

* Every absolute URI consists of a scheme, followed by a colon (':'), * followed by a scheme-specific part. For URIs that follow the * "generic URI" syntax, the scheme-specific part begins with two * slashes ("//") and may be followed by an authority segment (comprised * of user information, host, and port), path segment, query segment * and fragment. Note that RFC 2396 no longer specifies the use of the * parameters segment and excludes the "user:password" syntax as part of * the authority segment. If "user:password" appears in a URI, the entire * user/password string is stored as userinfo. *

* For URIs that do not follow the "generic URI" syntax (e.g. mailto), * the entire scheme-specific part is treated as the "path" portion * of the URI. *

* Note that, unlike the java.net.URL class, this class does not provide * any built-in network access functionality nor does it provide any * scheme-specific functionality (for example, it does not know a * default port for a specific scheme). Rather, it only knows the * grammar and basic set of operations that can be applied to a URI. * * @version $Id: URI.java 1226507 2012-01-02 18:45:01Z mrglavas $ * **********************************************************************/ public class URI implements Serializable { /******************************************************************* * MalformedURIExceptions are thrown in the process of building a URI * or setting fields on a URI when an operation would result in an * invalid URI specification. * ********************************************************************/ public static class MalformedURIException extends IOException { /** Serialization version. */ static final long serialVersionUID = -6695054834342951930L; /****************************************************************** * Constructs a MalformedURIException with no specified * detail message. ******************************************************************/ public MalformedURIException() { super(); } /***************************************************************** * Constructs a MalformedURIException with the * specified detail message. * * @param p_msg the detail message. ******************************************************************/ public MalformedURIException(String p_msg) { super(p_msg); } } /** Serialization version. */ static final long serialVersionUID = 1601921774685357214L; private static final byte [] fgLookupTable = new byte[128]; /** * Character Classes */ /** reserved characters ;/?:@&=+$,[] */ //RFC 2732 added '[' and ']' as reserved characters private static final int RESERVED_CHARACTERS = 0x01; /** URI punctuation mark characters: -_.!~*'() - these, combined with alphanumerics, constitute the "unreserved" characters */ private static final int MARK_CHARACTERS = 0x02; /** scheme can be composed of alphanumerics and these characters: +-. */ private static final int SCHEME_CHARACTERS = 0x04; /** userinfo can be composed of unreserved, escaped and these characters: ;:&=+$, */ private static final int USERINFO_CHARACTERS = 0x08; /** ASCII letter characters */ private static final int ASCII_ALPHA_CHARACTERS = 0x10; /** ASCII digit characters */ private static final int ASCII_DIGIT_CHARACTERS = 0x20; /** ASCII hex characters */ private static final int ASCII_HEX_CHARACTERS = 0x40; /** Path characters */ private static final int PATH_CHARACTERS = 0x80; /** Mask for alpha-numeric characters */ private static final int MASK_ALPHA_NUMERIC = ASCII_ALPHA_CHARACTERS | ASCII_DIGIT_CHARACTERS; /** Mask for unreserved characters */ private static final int MASK_UNRESERVED_MASK = MASK_ALPHA_NUMERIC | MARK_CHARACTERS; /** Mask for URI allowable characters except for % */ private static final int MASK_URI_CHARACTER = MASK_UNRESERVED_MASK | RESERVED_CHARACTERS; /** Mask for scheme characters */ private static final int MASK_SCHEME_CHARACTER = MASK_ALPHA_NUMERIC | SCHEME_CHARACTERS; /** Mask for userinfo characters */ private static final int MASK_USERINFO_CHARACTER = MASK_UNRESERVED_MASK | USERINFO_CHARACTERS; /** Mask for path characters */ private static final int MASK_PATH_CHARACTER = MASK_UNRESERVED_MASK | PATH_CHARACTERS; static { // Add ASCII Digits and ASCII Hex Numbers for (int i = '0'; i <= '9'; ++i) { fgLookupTable[i] |= ASCII_DIGIT_CHARACTERS | ASCII_HEX_CHARACTERS; } // Add ASCII Letters and ASCII Hex Numbers for (int i = 'A'; i <= 'F'; ++i) { fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS; fgLookupTable[i+0x00000020] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS; } // Add ASCII Letters for (int i = 'G'; i <= 'Z'; ++i) { fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS; fgLookupTable[i+0x00000020] |= ASCII_ALPHA_CHARACTERS; } // Add Reserved Characters fgLookupTable[';'] |= RESERVED_CHARACTERS; fgLookupTable['/'] |= RESERVED_CHARACTERS; fgLookupTable['?'] |= RESERVED_CHARACTERS; fgLookupTable[':'] |= RESERVED_CHARACTERS; fgLookupTable['@'] |= RESERVED_CHARACTERS; fgLookupTable['&'] |= RESERVED_CHARACTERS; fgLookupTable['='] |= RESERVED_CHARACTERS; fgLookupTable['+'] |= RESERVED_CHARACTERS; fgLookupTable['$'] |= RESERVED_CHARACTERS; fgLookupTable[','] |= RESERVED_CHARACTERS; fgLookupTable['['] |= RESERVED_CHARACTERS; fgLookupTable[']'] |= RESERVED_CHARACTERS; // Add Mark Characters fgLookupTable['-'] |= MARK_CHARACTERS; fgLookupTable['_'] |= MARK_CHARACTERS; fgLookupTable['.'] |= MARK_CHARACTERS; fgLookupTable['!'] |= MARK_CHARACTERS; fgLookupTable['~'] |= MARK_CHARACTERS; fgLookupTable['*'] |= MARK_CHARACTERS; fgLookupTable['\''] |= MARK_CHARACTERS; fgLookupTable['('] |= MARK_CHARACTERS; fgLookupTable[')'] |= MARK_CHARACTERS; // Add Scheme Characters fgLookupTable['+'] |= SCHEME_CHARACTERS; fgLookupTable['-'] |= SCHEME_CHARACTERS; fgLookupTable['.'] |= SCHEME_CHARACTERS; // Add Userinfo Characters fgLookupTable[';'] |= USERINFO_CHARACTERS; fgLookupTable[':'] |= USERINFO_CHARACTERS; fgLookupTable['&'] |= USERINFO_CHARACTERS; fgLookupTable['='] |= USERINFO_CHARACTERS; fgLookupTable['+'] |= USERINFO_CHARACTERS; fgLookupTable['$'] |= USERINFO_CHARACTERS; fgLookupTable[','] |= USERINFO_CHARACTERS; // Add Path Characters fgLookupTable[';'] |= PATH_CHARACTERS; fgLookupTable['/'] |= PATH_CHARACTERS; fgLookupTable[':'] |= PATH_CHARACTERS; fgLookupTable['@'] |= PATH_CHARACTERS; fgLookupTable['&'] |= PATH_CHARACTERS; fgLookupTable['='] |= PATH_CHARACTERS; fgLookupTable['+'] |= PATH_CHARACTERS; fgLookupTable['$'] |= PATH_CHARACTERS; fgLookupTable[','] |= PATH_CHARACTERS; } /** Stores the scheme (usually the protocol) for this URI. */ private String m_scheme = null; /** If specified, stores the userinfo for this URI; otherwise null */ private String m_userinfo = null; /** If specified, stores the host for this URI; otherwise null */ private String m_host = null; /** If specified, stores the port for this URI; otherwise -1 */ private int m_port = -1; /** If specified, stores the registry based authority for this URI; otherwise -1 */ private String m_regAuthority = null; /** If specified, stores the path for this URI; otherwise null */ private String m_path = null; /** If specified, stores the query string for this URI; otherwise null. */ private String m_queryString = null; /** If specified, stores the fragment for this URI; otherwise null */ private String m_fragment = null; /** * Construct a new and uninitialized URI. */ public URI() { } /** * Construct a new URI from another URI. All fields for this URI are * set equal to the fields of the URI passed in. * * @param p_other the URI to copy (cannot be null) */ public URI(URI p_other) { initialize(p_other); } /** * Construct a new URI from a URI specification string. If the * specification follows the "generic URI" syntax, (two slashes * following the first colon), the specification will be parsed * accordingly - setting the scheme, userinfo, host,port, path, query * string and fragment fields as necessary. If the specification does * not follow the "generic URI" syntax, the specification is parsed * into a scheme and scheme-specific part (stored as the path) only. * * @param p_uriSpec the URI specification string (cannot be null or * empty) * * @exception MalformedURIException if p_uriSpec violates any syntax * rules */ public URI(String p_uriSpec) throws MalformedURIException { this((URI)null, p_uriSpec); } /** * Construct a new URI from a URI specification string. If the * specification follows the "generic URI" syntax, (two slashes * following the first colon), the specification will be parsed * accordingly - setting the scheme, userinfo, host,port, path, query * string and fragment fields as necessary. If the specification does * not follow the "generic URI" syntax, the specification is parsed * into a scheme and scheme-specific part (stored as the path) only. * Construct a relative URI if boolean is assigned to "true" * and p_uriSpec is not valid absolute URI, instead of throwing an exception. * * @param p_uriSpec the URI specification string (cannot be null or * empty) * @param allowNonAbsoluteURI true to permit non-absolute URIs, * false otherwise. * * @exception MalformedURIException if p_uriSpec violates any syntax * rules */ public URI(String p_uriSpec, boolean allowNonAbsoluteURI) throws MalformedURIException { this((URI)null, p_uriSpec, allowNonAbsoluteURI); } /** * Construct a new URI from a base URI and a URI specification string. * The URI specification string may be a relative URI. * * @param p_base the base URI (cannot be null if p_uriSpec is null or * empty) * @param p_uriSpec the URI specification string (cannot be null or * empty if p_base is null) * * @exception MalformedURIException if p_uriSpec violates any syntax * rules */ public URI(URI p_base, String p_uriSpec) throws MalformedURIException { initialize(p_base, p_uriSpec); } /** * Construct a new URI from a base URI and a URI specification string. * The URI specification string may be a relative URI. * Construct a relative URI if boolean is assigned to "true" * and p_uriSpec is not valid absolute URI and p_base is null * instead of throwing an exception. * * @param p_base the base URI (cannot be null if p_uriSpec is null or * empty) * @param p_uriSpec the URI specification string (cannot be null or * empty if p_base is null) * @param allowNonAbsoluteURI true to permit non-absolute URIs, * false otherwise. * * @exception MalformedURIException if p_uriSpec violates any syntax * rules */ public URI(URI p_base, String p_uriSpec, boolean allowNonAbsoluteURI) throws MalformedURIException { initialize(p_base, p_uriSpec, allowNonAbsoluteURI); } /** * Construct a new URI that does not follow the generic URI syntax. * Only the scheme and scheme-specific part (stored as the path) are * initialized. * * @param p_scheme the URI scheme (cannot be null or empty) * @param p_schemeSpecificPart the scheme-specific part (cannot be * null or empty) * * @exception MalformedURIException if p_scheme violates any * syntax rules */ public URI(String p_scheme, String p_schemeSpecificPart) throws MalformedURIException { if (p_scheme == null || p_scheme.trim().length() == 0) { throw new MalformedURIException( "Cannot construct URI with null/empty scheme!"); } if (p_schemeSpecificPart == null || p_schemeSpecificPart.trim().length() == 0) { throw new MalformedURIException( "Cannot construct URI with null/empty scheme-specific part!"); } setScheme(p_scheme); setPath(p_schemeSpecificPart); } /** * Construct a new URI that follows the generic URI syntax from its * component parts. Each component is validated for syntax and some * basic semantic checks are performed as well. See the individual * setter methods for specifics. * * @param p_scheme the URI scheme (cannot be null or empty) * @param p_host the hostname, IPv4 address or IPv6 reference for the URI * @param p_path the URI path - if the path contains '?' or '#', * then the query string and/or fragment will be * set from the path; however, if the query and * fragment are specified both in the path and as * separate parameters, an exception is thrown * @param p_queryString the URI query string (cannot be specified * if path is null) * @param p_fragment the URI fragment (cannot be specified if path * is null) * * @exception MalformedURIException if any of the parameters violates * syntax rules or semantic rules */ public URI(String p_scheme, String p_host, String p_path, String p_queryString, String p_fragment) throws MalformedURIException { this(p_scheme, null, p_host, -1, p_path, p_queryString, p_fragment); } /** * Construct a new URI that follows the generic URI syntax from its * component parts. Each component is validated for syntax and some * basic semantic checks are performed as well. See the individual * setter methods for specifics. * * @param p_scheme the URI scheme (cannot be null or empty) * @param p_userinfo the URI userinfo (cannot be specified if host * is null) * @param p_host the hostname, IPv4 address or IPv6 reference for the URI * @param p_port the URI port (may be -1 for "unspecified"; cannot * be specified if host is null) * @param p_path the URI path - if the path contains '?' or '#', * then the query string and/or fragment will be * set from the path; however, if the query and * fragment are specified both in the path and as * separate parameters, an exception is thrown * @param p_queryString the URI query string (cannot be specified * if path is null) * @param p_fragment the URI fragment (cannot be specified if path * is null) * * @exception MalformedURIException if any of the parameters violates * syntax rules or semantic rules */ public URI(String p_scheme, String p_userinfo, String p_host, int p_port, String p_path, String p_queryString, String p_fragment) throws MalformedURIException { if (p_scheme == null || p_scheme.trim().length() == 0) { throw new MalformedURIException("Scheme is required!"); } if (p_host == null) { if (p_userinfo != null) { throw new MalformedURIException( "Userinfo may not be specified if host is not specified!"); } if (p_port != -1) { throw new MalformedURIException( "Port may not be specified if host is not specified!"); } } if (p_path != null) { if (p_path.indexOf('?') != -1 && p_queryString != null) { throw new MalformedURIException( "Query string cannot be specified in path and query string!"); } if (p_path.indexOf('#') != -1 && p_fragment != null) { throw new MalformedURIException( "Fragment cannot be specified in both the path and fragment!"); } } setScheme(p_scheme); setHost(p_host); setPort(p_port); setUserinfo(p_userinfo); setPath(p_path); setQueryString(p_queryString); setFragment(p_fragment); } /** * Initialize all fields of this URI from another URI. * * @param p_other the URI to copy (cannot be null) */ private void initialize(URI p_other) { m_scheme = p_other.getScheme(); m_userinfo = p_other.getUserinfo(); m_host = p_other.getHost(); m_port = p_other.getPort(); m_regAuthority = p_other.getRegBasedAuthority(); m_path = p_other.getPath(); m_queryString = p_other.getQueryString(); m_fragment = p_other.getFragment(); } /** * Initializes this URI from a base URI and a URI specification string. * See RFC 2396 Section 4 and Appendix B for specifications on parsing * the URI and Section 5 for specifications on resolving relative URIs * and relative paths. * * @param p_base the base URI (may be null if p_uriSpec is an absolute * URI) * @param p_uriSpec the URI spec string which may be an absolute or * relative URI (can only be null/empty if p_base * is not null) * @param allowNonAbsoluteURI true to permit non-absolute URIs, * in case of relative URI, false otherwise. * * @exception MalformedURIException if p_base is null and p_uriSpec * is not an absolute URI or if * p_uriSpec violates syntax rules */ private void initialize(URI p_base, String p_uriSpec, boolean allowNonAbsoluteURI) throws MalformedURIException { String uriSpec = p_uriSpec; int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0; if (p_base == null && uriSpecLen == 0) { if (allowNonAbsoluteURI) { m_path = ""; return; } throw new MalformedURIException("Cannot initialize URI with empty parameters."); } // just make a copy of the base if spec is empty if (uriSpecLen == 0) { initialize(p_base); return; } int index = 0; // Check for scheme, which must be before '/', '?' or '#'. int colonIdx = uriSpec.indexOf(':'); if (colonIdx != -1) { final int searchFrom = colonIdx - 1; // search backwards starting from character before ':'. int slashIdx = uriSpec.lastIndexOf('/', searchFrom); int queryIdx = uriSpec.lastIndexOf('?', searchFrom); int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom); if (colonIdx == 0 || slashIdx != -1 || queryIdx != -1 || fragmentIdx != -1) { // A standalone base is a valid URI according to spec if (colonIdx == 0 || (p_base == null && fragmentIdx != 0 && !allowNonAbsoluteURI)) { throw new MalformedURIException("No scheme found in URI."); } } else { initializeScheme(uriSpec); index = m_scheme.length()+1; // Neither 'scheme:' or 'scheme:#fragment' are valid URIs. if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx+1) == '#') { throw new MalformedURIException("Scheme specific part cannot be empty."); } } } else if (p_base == null && uriSpec.indexOf('#') != 0 && !allowNonAbsoluteURI) { throw new MalformedURIException("No scheme found in URI."); } // Two slashes means we may have authority, but definitely means we're either // matching net_path or abs_path. These two productions are ambiguous in that // every net_path (except those containing an IPv6Reference) is an abs_path. // RFC 2396 resolves this ambiguity by applying a greedy left most matching rule. // Try matching net_path first, and if that fails we don't have authority so // then attempt to match abs_path. // // net_path = "//" authority [ abs_path ] // abs_path = "/" path_segments if (((index+1) < uriSpecLen) && (uriSpec.charAt(index) == '/' && uriSpec.charAt(index+1) == '/')) { index += 2; int startPos = index; // Authority will be everything up to path, query or fragment char testChar = '\0'; while (index < uriSpecLen) { testChar = uriSpec.charAt(index); if (testChar == '/' || testChar == '?' || testChar == '#') { break; } index++; } // Attempt to parse authority. If the section is an empty string // this is a valid server based authority, so set the host to this // value. if (index > startPos) { // If we didn't find authority we need to back up. Attempt to // match against abs_path next. if (!initializeAuthority(uriSpec.substring(startPos, index))) { index = startPos - 2; } } else { m_host = ""; } } initializePath(uriSpec, index); // Resolve relative URI to base URI - see RFC 2396 Section 5.2 // In some cases, it might make more sense to throw an exception // (when scheme is specified is the string spec and the base URI // is also specified, for example), but we're just following the // RFC specifications if (p_base != null) { absolutize(p_base); } } /** * Initializes this URI from a base URI and a URI specification string. * See RFC 2396 Section 4 and Appendix B for specifications on parsing * the URI and Section 5 for specifications on resolving relative URIs * and relative paths. * * @param p_base the base URI (may be null if p_uriSpec is an absolute * URI) * @param p_uriSpec the URI spec string which may be an absolute or * relative URI (can only be null/empty if p_base * is not null) * * @exception MalformedURIException if p_base is null and p_uriSpec * is not an absolute URI or if * p_uriSpec violates syntax rules */ private void initialize(URI p_base, String p_uriSpec) throws MalformedURIException { String uriSpec = p_uriSpec; int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0; if (p_base == null && uriSpecLen == 0) { throw new MalformedURIException( "Cannot initialize URI with empty parameters."); } // just make a copy of the base if spec is empty if (uriSpecLen == 0) { initialize(p_base); return; } int index = 0; // Check for scheme, which must be before '/', '?' or '#'. int colonIdx = uriSpec.indexOf(':'); if (colonIdx != -1) { final int searchFrom = colonIdx - 1; // search backwards starting from character before ':'. int slashIdx = uriSpec.lastIndexOf('/', searchFrom); int queryIdx = uriSpec.lastIndexOf('?', searchFrom); int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom); if (colonIdx == 0 || slashIdx != -1 || queryIdx != -1 || fragmentIdx != -1) { // A standalone base is a valid URI according to spec if (colonIdx == 0 || (p_base == null && fragmentIdx != 0)) { throw new MalformedURIException("No scheme found in URI."); } } else { initializeScheme(uriSpec); index = m_scheme.length()+1; // Neither 'scheme:' or 'scheme:#fragment' are valid URIs. if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx+1) == '#') { throw new MalformedURIException("Scheme specific part cannot be empty."); } } } else if (p_base == null && uriSpec.indexOf('#') != 0) { throw new MalformedURIException("No scheme found in URI."); } // Two slashes means we may have authority, but definitely means we're either // matching net_path or abs_path. These two productions are ambiguous in that // every net_path (except those containing an IPv6Reference) is an abs_path. // RFC 2396 resolves this ambiguity by applying a greedy left most matching rule. // Try matching net_path first, and if that fails we don't have authority so // then attempt to match abs_path. // // net_path = "//" authority [ abs_path ] // abs_path = "/" path_segments if (((index+1) < uriSpecLen) && (uriSpec.charAt(index) == '/' && uriSpec.charAt(index+1) == '/')) { index += 2; int startPos = index; // Authority will be everything up to path, query or fragment char testChar = '\0'; while (index < uriSpecLen) { testChar = uriSpec.charAt(index); if (testChar == '/' || testChar == '?' || testChar == '#') { break; } index++; } // Attempt to parse authority. If the section is an empty string // this is a valid server based authority, so set the host to this // value. if (index > startPos) { // If we didn't find authority we need to back up. Attempt to // match against abs_path next. if (!initializeAuthority(uriSpec.substring(startPos, index))) { index = startPos - 2; } } else { m_host = ""; } } initializePath(uriSpec, index); // Resolve relative URI to base URI - see RFC 2396 Section 5.2 // In some cases, it might make more sense to throw an exception // (when scheme is specified is the string spec and the base URI // is also specified, for example), but we're just following the // RFC specifications if (p_base != null) { absolutize(p_base); } } /** * Absolutize URI with given base URI. * * @param p_base base URI for absolutization */ public void absolutize(URI p_base) { // check to see if this is the current doc - RFC 2396 5.2 #2 // note that this is slightly different from the RFC spec in that // we don't include the check for query string being null // - this handles cases where the urispec is just a query // string or a fragment (e.g. "?y" or "#s") - // see which // identified this as a bug in the RFC if (m_path.length() == 0 && m_scheme == null && m_host == null && m_regAuthority == null) { m_scheme = p_base.getScheme(); m_userinfo = p_base.getUserinfo(); m_host = p_base.getHost(); m_port = p_base.getPort(); m_regAuthority = p_base.getRegBasedAuthority(); m_path = p_base.getPath(); if (m_queryString == null) { m_queryString = p_base.getQueryString(); if (m_fragment == null) { m_fragment = p_base.getFragment(); } } return; } // check for scheme - RFC 2396 5.2 #3 // if we found a scheme, it means absolute URI, so we're done if (m_scheme == null) { m_scheme = p_base.getScheme(); } else { return; } // check for authority - RFC 2396 5.2 #4 // if we found a host, then we've got a network path, so we're done if (m_host == null && m_regAuthority == null) { m_userinfo = p_base.getUserinfo(); m_host = p_base.getHost(); m_port = p_base.getPort(); m_regAuthority = p_base.getRegBasedAuthority(); } else { return; } // check for absolute path - RFC 2396 5.2 #5 if (m_path.length() > 0 && m_path.startsWith("/")) { return; } // if we get to this point, we need to resolve relative path // RFC 2396 5.2 #6 String path = ""; String basePath = p_base.getPath(); // 6a - get all but the last segment of the base URI path if (basePath != null && basePath.length() > 0) { int lastSlash = basePath.lastIndexOf('/'); if (lastSlash != -1) { path = basePath.substring(0, lastSlash+1); } } else if (m_path.length() > 0) { path = "/"; } // 6b - append the relative URI path path = path.concat(m_path); // 6c - remove all "./" where "." is a complete path segment int index = -1; while ((index = path.indexOf("/./")) != -1) { path = path.substring(0, index+1).concat(path.substring(index+3)); } // 6d - remove "." if path ends with "." as a complete path segment if (path.endsWith("/.")) { path = path.substring(0, path.length()-1); } // 6e - remove all "/../" where "" is a complete // path segment not equal to ".." index = 1; int segIndex = -1; String tempString = null; while ((index = path.indexOf("/../", index)) > 0) { tempString = path.substring(0, path.indexOf("/../")); segIndex = tempString.lastIndexOf('/'); if (segIndex != -1) { if (!tempString.substring(segIndex).equals("..")) { path = path.substring(0, segIndex+1).concat(path.substring(index+4)); index = segIndex; } else { index += 4; } } else { index += 4; } } // 6f - remove ending "/.." where "" is a // complete path segment if (path.endsWith("/..")) { tempString = path.substring(0, path.length()-3); segIndex = tempString.lastIndexOf('/'); if (segIndex != -1) { path = path.substring(0, segIndex+1); } } m_path = path; } /** * Initialize the scheme for this URI from a URI string spec. * * @param p_uriSpec the URI specification (cannot be null) * * @exception MalformedURIException if URI does not have a conformant * scheme */ private void initializeScheme(String p_uriSpec) throws MalformedURIException { int uriSpecLen = p_uriSpec.length(); int index = 0; String scheme = null; char testChar = '\0'; while (index < uriSpecLen) { testChar = p_uriSpec.charAt(index); if (testChar == ':' || testChar == '/' || testChar == '?' || testChar == '#') { break; } index++; } scheme = p_uriSpec.substring(0, index); if (scheme.length() == 0) { throw new MalformedURIException("No scheme found in URI."); } else { setScheme(scheme); } } /** * Initialize the authority (either server or registry based) * for this URI from a URI string spec. * * @param p_uriSpec the URI specification (cannot be null) * * @return true if the given string matched server or registry * based authority */ private boolean initializeAuthority(String p_uriSpec) { int index = 0; int start = 0; int end = p_uriSpec.length(); char testChar = '\0'; String userinfo = null; // userinfo is everything up to @ if (p_uriSpec.indexOf('@', start) != -1) { while (index < end) { testChar = p_uriSpec.charAt(index); if (testChar == '@') { break; } index++; } userinfo = p_uriSpec.substring(start, index); index++; } // host is everything up to last ':', or up to // and including ']' if followed by ':'. String host = null; start = index; boolean hasPort = false; if (index < end) { if (p_uriSpec.charAt(start) == '[') { int bracketIndex = p_uriSpec.indexOf(']', start); index = (bracketIndex != -1) ? bracketIndex : end; if (index+1 < end && p_uriSpec.charAt(index+1) == ':') { ++index; hasPort = true; } else { index = end; } } else { int colonIndex = p_uriSpec.lastIndexOf(':', end); index = (colonIndex > start) ? colonIndex : end; hasPort = (index != end); } } host = p_uriSpec.substring(start, index); int port = -1; if (host.length() > 0) { // port if (hasPort) { index++; start = index; while (index < end) { index++; } String portStr = p_uriSpec.substring(start, index); if (portStr.length() > 0) { // REVISIT: Remove this code. /** for (int i = 0; i < portStr.length(); i++) { if (!isDigit(portStr.charAt(i))) { throw new MalformedURIException( portStr + " is invalid. Port should only contain digits!"); } }**/ // REVISIT: Remove this code. // Store port value as string instead of integer. try { port = Integer.parseInt(portStr); if (port == -1) --port; } catch (NumberFormatException nfe) { port = -2; } } } } if (isValidServerBasedAuthority(host, port, userinfo)) { m_host = host; m_port = port; m_userinfo = userinfo; return true; } // Note: Registry based authority is being removed from a // new spec for URI which would obsolete RFC 2396. If the // spec is added to XML errata, processing of reg_name // needs to be removed. - mrglavas. else if (isValidRegistryBasedAuthority(p_uriSpec)) { m_regAuthority = p_uriSpec; return true; } return false; } /** * Determines whether the components host, port, and user info * are valid as a server authority. * * @param host the host component of authority * @param port the port number component of authority * @param userinfo the user info component of authority * * @return true if the given host, port, and userinfo compose * a valid server authority */ private boolean isValidServerBasedAuthority(String host, int port, String userinfo) { // Check if the host is well formed. if (!isWellFormedAddress(host)) { return false; } // Check that port is well formed if it exists. // REVISIT: There's no restriction on port value ranges, but // perform the same check as in setPort to be consistent. Pass // in a string to this method instead of an integer. if (port < -1 || port > 65535) { return false; } // Check that userinfo is well formed if it exists. if (userinfo != null) { // Userinfo can contain alphanumerics, mark characters, escaped // and ';',':','&','=','+','$',',' int index = 0; int end = userinfo.length(); char testChar = '\0'; while (index < end) { testChar = userinfo.charAt(index); if (testChar == '%') { if (index+2 >= end || !isHex(userinfo.charAt(index+1)) || !isHex(userinfo.charAt(index+2))) { return false; } index += 2; } else if (!isUserinfoCharacter(testChar)) { return false; } ++index; } } return true; } /** * Determines whether the given string is a registry based authority. * * @param authority the authority component of a URI * * @return true if the given string is a registry based authority */ private boolean isValidRegistryBasedAuthority(String authority) { int index = 0; int end = authority.length(); char testChar; while (index < end) { testChar = authority.charAt(index); // check for valid escape sequence if (testChar == '%') { if (index+2 >= end || !isHex(authority.charAt(index+1)) || !isHex(authority.charAt(index+2))) { return false; } index += 2; } // can check against path characters because the set // is the same except for '/' which we've already excluded. else if (!isPathCharacter(testChar)) { return false; } ++index; } return true; } /** * Initialize the path for this URI from a URI string spec. * * @param p_uriSpec the URI specification (cannot be null) * @param p_nStartIndex the index to begin scanning from * * @exception MalformedURIException if p_uriSpec violates syntax rules */ private void initializePath(String p_uriSpec, int p_nStartIndex) throws MalformedURIException { if (p_uriSpec == null) { throw new MalformedURIException( "Cannot initialize path from null string!"); } int index = p_nStartIndex; int start = p_nStartIndex; int end = p_uriSpec.length(); char testChar = '\0'; // path - everything up to query string or fragment if (start < end) { // RFC 2732 only allows '[' and ']' to appear in the opaque part. if (getScheme() == null || p_uriSpec.charAt(start) == '/') { // Scan path. // abs_path = "/" path_segments // rel_path = rel_segment [ abs_path ] while (index < end) { testChar = p_uriSpec.charAt(index); // check for valid escape sequence if (testChar == '%') { if (index+2 >= end || !isHex(p_uriSpec.charAt(index+1)) || !isHex(p_uriSpec.charAt(index+2))) { throw new MalformedURIException( "Path contains invalid escape sequence!"); } index += 2; } // Path segments cannot contain '[' or ']' since pchar // production was not changed by RFC 2732. else if (!isPathCharacter(testChar)) { if (testChar == '?' || testChar == '#') { break; } throw new MalformedURIException( "Path contains invalid character: " + testChar); } ++index; } } else { // Scan opaque part. // opaque_part = uric_no_slash *uric while (index < end) { testChar = p_uriSpec.charAt(index); if (testChar == '?' || testChar == '#') { break; } // check for valid escape sequence if (testChar == '%') { if (index+2 >= end || !isHex(p_uriSpec.charAt(index+1)) || !isHex(p_uriSpec.charAt(index+2))) { throw new MalformedURIException( "Opaque part contains invalid escape sequence!"); } index += 2; } // If the scheme specific part is opaque, it can contain '[' // and ']'. uric_no_slash wasn't modified by RFC 2732, which // I've interpreted as an error in the spec, since the // production should be equivalent to (uric - '/'), and uric // contains '[' and ']'. - mrglavas else if (!isURICharacter(testChar)) { throw new MalformedURIException( "Opaque part contains invalid character: " + testChar); } ++index; } } } m_path = p_uriSpec.substring(start, index); // query - starts with ? and up to fragment or end if (testChar == '?') { index++; start = index; while (index < end) { testChar = p_uriSpec.charAt(index); if (testChar == '#') { break; } if (testChar == '%') { if (index+2 >= end || !isHex(p_uriSpec.charAt(index+1)) || !isHex(p_uriSpec.charAt(index+2))) { throw new MalformedURIException( "Query string contains invalid escape sequence!"); } index += 2; } else if (!isURICharacter(testChar)) { throw new MalformedURIException( "Query string contains invalid character: " + testChar); } index++; } m_queryString = p_uriSpec.substring(start, index); } // fragment - starts with # if (testChar == '#') { index++; start = index; while (index < end) { testChar = p_uriSpec.charAt(index); if (testChar == '%') { if (index+2 >= end || !isHex(p_uriSpec.charAt(index+1)) || !isHex(p_uriSpec.charAt(index+2))) { throw new MalformedURIException( "Fragment contains invalid escape sequence!"); } index += 2; } else if (!isURICharacter(testChar)) { throw new MalformedURIException( "Fragment contains invalid character: "+testChar); } index++; } m_fragment = p_uriSpec.substring(start, index); } } /** * Get the scheme for this URI. * * @return the scheme for this URI */ public String getScheme() { return m_scheme; } /** * Get the scheme-specific part for this URI (everything following the * scheme and the first colon). See RFC 2396 Section 5.2 for spec. * * @return the scheme-specific part for this URI */ public String getSchemeSpecificPart() { StringBuffer schemespec = new StringBuffer(); if (m_host != null || m_regAuthority != null) { schemespec.append("//"); // Server based authority. if (m_host != null) { if (m_userinfo != null) { schemespec.append(m_userinfo); schemespec.append('@'); } schemespec.append(m_host); if (m_port != -1) { schemespec.append(':'); schemespec.append(m_port); } } // Registry based authority. else { schemespec.append(m_regAuthority); } } if (m_path != null) { schemespec.append((m_path)); } if (m_queryString != null) { schemespec.append('?'); schemespec.append(m_queryString); } if (m_fragment != null) { schemespec.append('#'); schemespec.append(m_fragment); } return schemespec.toString(); } /** * Get the userinfo for this URI. * * @return the userinfo for this URI (null if not specified). */ public String getUserinfo() { return m_userinfo; } /** * Get the host for this URI. * * @return the host for this URI (null if not specified). */ public String getHost() { return m_host; } /** * Get the port for this URI. * * @return the port for this URI (-1 if not specified). */ public int getPort() { return m_port; } /** * Get the registry based authority for this URI. * * @return the registry based authority (null if not specified). */ public String getRegBasedAuthority() { return m_regAuthority; } /** * Get the authority for this URI. * * @return the authority */ public String getAuthority() { StringBuffer authority = new StringBuffer(); if (m_host != null || m_regAuthority != null) { authority.append("//"); // Server based authority. if (m_host != null) { if (m_userinfo != null) { authority.append(m_userinfo); authority.append('@'); } authority.append(m_host); if (m_port != -1) { authority.append(':'); authority.append(m_port); } } // Registry based authority. else { authority.append(m_regAuthority); } } return authority.toString(); } /** * Get the path for this URI (optionally with the query string and * fragment). * * @param p_includeQueryString if true (and query string is not null), * then a "?" followed by the query string * will be appended * @param p_includeFragment if true (and fragment is not null), * then a "#" followed by the fragment * will be appended * * @return the path for this URI possibly including the query string * and fragment */ public String getPath(boolean p_includeQueryString, boolean p_includeFragment) { StringBuffer pathString = new StringBuffer(m_path); if (p_includeQueryString && m_queryString != null) { pathString.append('?'); pathString.append(m_queryString); } if (p_includeFragment && m_fragment != null) { pathString.append('#'); pathString.append(m_fragment); } return pathString.toString(); } /** * Get the path for this URI. Note that the value returned is the path * only and does not include the query string or fragment. * * @return the path for this URI. */ public String getPath() { return m_path; } /** * Get the query string for this URI. * * @return the query string for this URI. Null is returned if there * was no "?" in the URI spec, empty string if there was a * "?" but no query string following it. */ public String getQueryString() { return m_queryString; } /** * Get the fragment for this URI. * * @return the fragment for this URI. Null is returned if there * was no "#" in the URI spec, empty string if there was a * "#" but no fragment following it. */ public String getFragment() { return m_fragment; } /** * Set the scheme for this URI. The scheme is converted to lowercase * before it is set. * * @param p_scheme the scheme for this URI (cannot be null) * * @exception MalformedURIException if p_scheme is not a conformant * scheme name */ public void setScheme(String p_scheme) throws MalformedURIException { if (p_scheme == null) { throw new MalformedURIException( "Cannot set scheme from null string!"); } if (!isConformantSchemeName(p_scheme)) { throw new MalformedURIException("The scheme is not conformant."); } m_scheme = p_scheme.toLowerCase(Locale.ENGLISH); } /** * Set the userinfo for this URI. If a non-null value is passed in and * the host value is null, then an exception is thrown. * * @param p_userinfo the userinfo for this URI * * @exception MalformedURIException if p_userinfo contains invalid * characters */ public void setUserinfo(String p_userinfo) throws MalformedURIException { if (p_userinfo == null) { m_userinfo = null; return; } else { if (m_host == null) { throw new MalformedURIException( "Userinfo cannot be set when host is null!"); } // userinfo can contain alphanumerics, mark characters, escaped // and ';',':','&','=','+','$',',' int index = 0; int end = p_userinfo.length(); char testChar = '\0'; while (index < end) { testChar = p_userinfo.charAt(index); if (testChar == '%') { if (index+2 >= end || !isHex(p_userinfo.charAt(index+1)) || !isHex(p_userinfo.charAt(index+2))) { throw new MalformedURIException( "Userinfo contains invalid escape sequence!"); } } else if (!isUserinfoCharacter(testChar)) { throw new MalformedURIException( "Userinfo contains invalid character:"+testChar); } index++; } } m_userinfo = p_userinfo; } /** *

Set the host for this URI. If null is passed in, the userinfo * field is also set to null and the port is set to -1.

* *

Note: This method overwrites registry based authority if it * previously existed in this URI.

* * @param p_host the host for this URI * * @exception MalformedURIException if p_host is not a valid IP * address or DNS hostname. */ public void setHost(String p_host) throws MalformedURIException { if (p_host == null || p_host.length() == 0) { if (p_host != null) { m_regAuthority = null; } m_host = p_host; m_userinfo = null; m_port = -1; return; } else if (!isWellFormedAddress(p_host)) { throw new MalformedURIException("Host is not a well formed address!"); } m_host = p_host; m_regAuthority = null; } /** * Set the port for this URI. -1 is used to indicate that the port is * not specified, otherwise valid port numbers are between 0 and 65535. * If a valid port number is passed in and the host field is null, * an exception is thrown. * * @param p_port the port number for this URI * * @exception MalformedURIException if p_port is not -1 and not a * valid port number */ public void setPort(int p_port) throws MalformedURIException { if (p_port >= 0 && p_port <= 65535) { if (m_host == null) { throw new MalformedURIException( "Port cannot be set when host is null!"); } } else if (p_port != -1) { throw new MalformedURIException("Invalid port number!"); } m_port = p_port; } /** *

Sets the registry based authority for this URI.

* *

Note: This method overwrites server based authority * if it previously existed in this URI.

* * @param authority the registry based authority for this URI * * @exception MalformedURIException it authority is not a * well formed registry based authority */ public void setRegBasedAuthority(String authority) throws MalformedURIException { if (authority == null) { m_regAuthority = null; return; } // reg_name = 1*( unreserved | escaped | "$" | "," | // ";" | ":" | "@" | "&" | "=" | "+" ) else if (authority.length() < 1 || !isValidRegistryBasedAuthority(authority) || authority.indexOf('/') != -1) { throw new MalformedURIException("Registry based authority is not well formed."); } m_regAuthority = authority; m_host = null; m_userinfo = null; m_port = -1; } /** * Set the path for this URI. If the supplied path is null, then the * query string and fragment are set to null as well. If the supplied * path includes a query string and/or fragment, these fields will be * parsed and set as well. Note that, for URIs following the "generic * URI" syntax, the path specified should start with a slash. * For URIs that do not follow the generic URI syntax, this method * sets the scheme-specific part. * * @param p_path the path for this URI (may be null) * * @exception MalformedURIException if p_path contains invalid * characters */ public void setPath(String p_path) throws MalformedURIException { if (p_path == null) { m_path = null; m_queryString = null; m_fragment = null; } else { initializePath(p_path, 0); } } /** * Append to the end of the path of this URI. If the current path does * not end in a slash and the path to be appended does not begin with * a slash, a slash will be appended to the current path before the * new segment is added. Also, if the current path ends in a slash * and the new segment begins with a slash, the extra slash will be * removed before the new segment is appended. * * @param p_addToPath the new segment to be added to the current path * * @exception MalformedURIException if p_addToPath contains syntax * errors */ public void appendPath(String p_addToPath) throws MalformedURIException { if (p_addToPath == null || p_addToPath.trim().length() == 0) { return; } if (!isURIString(p_addToPath)) { throw new MalformedURIException( "Path contains invalid character!"); } if (m_path == null || m_path.trim().length() == 0) { if (p_addToPath.startsWith("/")) { m_path = p_addToPath; } else { m_path = "/" + p_addToPath; } } else if (m_path.endsWith("/")) { if (p_addToPath.startsWith("/")) { m_path = m_path.concat(p_addToPath.substring(1)); } else { m_path = m_path.concat(p_addToPath); } } else { if (p_addToPath.startsWith("/")) { m_path = m_path.concat(p_addToPath); } else { m_path = m_path.concat("/" + p_addToPath); } } } /** * Set the query string for this URI. A non-null value is valid only * if this is an URI conforming to the generic URI syntax and * the path value is not null. * * @param p_queryString the query string for this URI * * @exception MalformedURIException if p_queryString is not null and this * URI does not conform to the generic * URI syntax or if the path is null */ public void setQueryString(String p_queryString) throws MalformedURIException { if (p_queryString == null) { m_queryString = null; } else if (!isGenericURI()) { throw new MalformedURIException( "Query string can only be set for a generic URI!"); } else if (getPath() == null) { throw new MalformedURIException( "Query string cannot be set when path is null!"); } else if (!isURIString(p_queryString)) { throw new MalformedURIException( "Query string contains invalid character!"); } else { m_queryString = p_queryString; } } /** * Set the fragment for this URI. A non-null value is valid only * if this is a URI conforming to the generic URI syntax and * the path value is not null. * * @param p_fragment the fragment for this URI * * @exception MalformedURIException if p_fragment is not null and this * URI does not conform to the generic * URI syntax or if the path is null */ public void setFragment(String p_fragment) throws MalformedURIException { if (p_fragment == null) { m_fragment = null; } else if (!isGenericURI()) { throw new MalformedURIException( "Fragment can only be set for a generic URI!"); } else if (getPath() == null) { throw new MalformedURIException( "Fragment cannot be set when path is null!"); } else if (!isURIString(p_fragment)) { throw new MalformedURIException( "Fragment contains invalid character!"); } else { m_fragment = p_fragment; } } /** * Determines if the passed-in Object is equivalent to this URI. * * @param p_test the Object to test for equality. * * @return true if p_test is a URI with all values equal to this * URI, false otherwise */ public boolean equals(Object p_test) { if (p_test instanceof URI) { URI testURI = (URI) p_test; if (((m_scheme == null && testURI.m_scheme == null) || (m_scheme != null && testURI.m_scheme != null && m_scheme.equals(testURI.m_scheme))) && ((m_userinfo == null && testURI.m_userinfo == null) || (m_userinfo != null && testURI.m_userinfo != null && m_userinfo.equals(testURI.m_userinfo))) && ((m_host == null && testURI.m_host == null) || (m_host != null && testURI.m_host != null && m_host.equals(testURI.m_host))) && m_port == testURI.m_port && ((m_path == null && testURI.m_path == null) || (m_path != null && testURI.m_path != null && m_path.equals(testURI.m_path))) && ((m_queryString == null && testURI.m_queryString == null) || (m_queryString != null && testURI.m_queryString != null && m_queryString.equals(testURI.m_queryString))) && ((m_fragment == null && testURI.m_fragment == null) || (m_fragment != null && testURI.m_fragment != null && m_fragment.equals(testURI.m_fragment)))) { return true; } } return false; } /** * Get the URI as a string specification. See RFC 2396 Section 5.2. * * @return the URI string specification */ public String toString() { StringBuffer uriSpecString = new StringBuffer(); if (m_scheme != null) { uriSpecString.append(m_scheme); uriSpecString.append(':'); } uriSpecString.append(getSchemeSpecificPart()); return uriSpecString.toString(); } /** * Get the indicator as to whether this URI uses the "generic URI" * syntax. * * @return true if this URI uses the "generic URI" syntax, false * otherwise */ public boolean isGenericURI() { // presence of the host (whether valid or empty) means // double-slashes which means generic uri return (m_host != null); } /** * Returns whether this URI represents an absolute URI. * * @return true if this URI represents an absolute URI, false * otherwise */ public boolean isAbsoluteURI() { // presence of the scheme means absolute uri return (m_scheme != null); } /** * Determine whether a scheme conforms to the rules for a scheme name. * A scheme is conformant if it starts with an alphanumeric, and * contains only alphanumerics, '+','-' and '.'. * * @return true if the scheme is conformant, false otherwise */ public static boolean isConformantSchemeName(String p_scheme) { if (p_scheme == null || p_scheme.trim().length() == 0) { return false; } if (!isAlpha(p_scheme.charAt(0))) { return false; } char testChar; int schemeLength = p_scheme.length(); for (int i = 1; i < schemeLength; ++i) { testChar = p_scheme.charAt(i); if (!isSchemeCharacter(testChar)) { return false; } } return true; } /** * Determine whether a string is syntactically capable of representing * a valid IPv4 address, IPv6 reference or the domain name of a network host. * A valid IPv4 address consists of four decimal digit groups separated by a * '.'. Each group must consist of one to three digits. See RFC 2732 Section 3, * and RFC 2373 Section 2.2, for the definition of IPv6 references. A hostname * consists of domain labels (each of which must begin and end with an alphanumeric * but may contain '-') separated & by a '.'. See RFC 2396 Section 3.2.2. * * @return true if the string is a syntactically valid IPv4 address, * IPv6 reference or hostname */ public static boolean isWellFormedAddress(String address) { if (address == null) { return false; } int addrLength = address.length(); if (addrLength == 0) { return false; } // Check if the host is a valid IPv6reference. if (address.startsWith("[")) { return isWellFormedIPv6Reference(address); } // Cannot start with a '.', '-', or end with a '-'. if (address.startsWith(".") || address.startsWith("-") || address.endsWith("-")) { return false; } // rightmost domain label starting with digit indicates IP address // since top level domain label can only start with an alpha // see RFC 2396 Section 3.2.2 int index = address.lastIndexOf('.'); if (address.endsWith(".")) { index = address.substring(0, index).lastIndexOf('.'); } if (index+1 < addrLength && isDigit(address.charAt(index+1))) { return isWellFormedIPv4Address(address); } else { // hostname = *( domainlabel "." ) toplabel [ "." ] // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum // toplabel = alpha | alpha *( alphanum | "-" ) alphanum // RFC 2396 states that hostnames take the form described in // RFC 1034 (Section 3) and RFC 1123 (Section 2.1). According // to RFC 1034, hostnames are limited to 255 characters. if (addrLength > 255) { return false; } // domain labels can contain alphanumerics and '-" // but must start and end with an alphanumeric char testChar; int labelCharCount = 0; for (int i = 0; i < addrLength; i++) { testChar = address.charAt(i); if (testChar == '.') { if (!isAlphanum(address.charAt(i-1))) { return false; } if (i+1 < addrLength && !isAlphanum(address.charAt(i+1))) { return false; } labelCharCount = 0; } else if (!isAlphanum(testChar) && testChar != '-') { return false; } // RFC 1034: Labels must be 63 characters or less. else if (++labelCharCount > 63) { return false; } } } return true; } /** *

Determines whether a string is an IPv4 address as defined by * RFC 2373, and under the further constraint that it must be a 32-bit * address. Though not expressed in the grammar, in order to satisfy * the 32-bit address constraint, each segment of the address cannot * be greater than 255 (8 bits of information).

* *

IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT

* * @return true if the string is a syntactically valid IPv4 address */ public static boolean isWellFormedIPv4Address(String address) { int addrLength = address.length(); char testChar; int numDots = 0; int numDigits = 0; // make sure that 1) we see only digits and dot separators, 2) that // any dot separator is preceded and followed by a digit and // 3) that we find 3 dots // // RFC 2732 amended RFC 2396 by replacing the definition // of IPv4address with the one defined by RFC 2373. - mrglavas // // IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT // // One to three digits must be in each segment. for (int i = 0; i < addrLength; i++) { testChar = address.charAt(i); if (testChar == '.') { if ((i > 0 && !isDigit(address.charAt(i-1))) || (i+1 < addrLength && !isDigit(address.charAt(i+1)))) { return false; } numDigits = 0; if (++numDots > 3) { return false; } } else if (!isDigit(testChar)) { return false; } // Check that that there are no more than three digits // in this segment. else if (++numDigits > 3) { return false; } // Check that this segment is not greater than 255. else if (numDigits == 3) { char first = address.charAt(i-2); char second = address.charAt(i-1); if (!(first < '2' || (first == '2' && (second < '5' || (second == '5' && testChar <= '5'))))) { return false; } } } return (numDots == 3); } /** *

Determines whether a string is an IPv6 reference as defined * by RFC 2732, where IPv6address is defined in RFC 2373. The * IPv6 address is parsed according to Section 2.2 of RFC 2373, * with the additional constraint that the address be composed of * 128 bits of information.

* *

IPv6reference = "[" IPv6address "]"

* *

Note: The BNF expressed in RFC 2373 Appendix B does not * accurately describe section 2.2, and was in fact removed from * RFC 3513, the successor of RFC 2373.

* * @return true if the string is a syntactically valid IPv6 reference */ public static boolean isWellFormedIPv6Reference(String address) { int addrLength = address.length(); int index = 1; int end = addrLength-1; // Check if string is a potential match for IPv6reference. if (!(addrLength > 2 && address.charAt(0) == '[' && address.charAt(end) == ']')) { return false; } // Counter for the number of 16-bit sections read in the address. int [] counter = new int[1]; // Scan hex sequence before possible '::' or IPv4 address. index = scanHexSequence(address, index, end, counter); if (index == -1) { return false; } // Address must contain 128-bits of information. else if (index == end) { return (counter[0] == 8); } if (index+1 < end && address.charAt(index) == ':') { if (address.charAt(index+1) == ':') { // '::' represents at least one 16-bit group of zeros. if (++counter[0] > 8) { return false; } index += 2; // Trailing zeros will fill out the rest of the address. if (index == end) { return true; } } // If the second character wasn't ':', in order to be valid, // the remainder of the string must match IPv4Address, // and we must have read exactly 6 16-bit groups. else { return (counter[0] == 6) && isWellFormedIPv4Address(address.substring(index+1, end)); } } else { return false; } // 3. Scan hex sequence after '::'. int prevCount = counter[0]; index = scanHexSequence(address, index, end, counter); // We've either reached the end of the string, the address ends in // an IPv4 address, or it is invalid. scanHexSequence has already // made sure that we have the right number of bits. return (index == end) || (index != -1 && isWellFormedIPv4Address( address.substring((counter[0] > prevCount) ? index+1 : index, end))); } /** * Helper method for isWellFormedIPv6Reference which scans the * hex sequences of an IPv6 address. It returns the index of the * next character to scan in the address, or -1 if the string * cannot match a valid IPv6 address. * * @param address the string to be scanned * @param index the beginning index (inclusive) * @param end the ending index (exclusive) * @param counter a counter for the number of 16-bit sections read * in the address * * @return the index of the next character to scan, or -1 if the * string cannot match a valid IPv6 address */ private static int scanHexSequence (String address, int index, int end, int [] counter) { char testChar; int numDigits = 0; int start = index; // Trying to match the following productions: // hexseq = hex4 *( ":" hex4) // hex4 = 1*4HEXDIG for (; index < end; ++index) { testChar = address.charAt(index); if (testChar == ':') { // IPv6 addresses are 128-bit, so there can be at most eight sections. if (numDigits > 0 && ++counter[0] > 8) { return -1; } // This could be '::'. if (numDigits == 0 || ((index+1 < end) && address.charAt(index+1) == ':')) { return index; } numDigits = 0; } // This might be invalid or an IPv4address. If it's potentially an IPv4address, // backup to just after the last valid character that matches hexseq. else if (!isHex(testChar)) { if (testChar == '.' && numDigits < 4 && numDigits > 0 && counter[0] <= 6) { int back = index - numDigits - 1; return (back >= start) ? back : (back+1); } return -1; } // There can be at most 4 hex digits per group. else if (++numDigits > 4) { return -1; } } return (numDigits > 0 && ++counter[0] <= 8) ? end : -1; } /** * Determine whether a char is a digit. * * @return true if the char is betweeen '0' and '9', false otherwise */ private static boolean isDigit(char p_char) { return p_char >= '0' && p_char <= '9'; } /** * Determine whether a character is a hexadecimal character. * * @return true if the char is betweeen '0' and '9', 'a' and 'f' * or 'A' and 'F', false otherwise */ private static boolean isHex(char p_char) { return (p_char <= 'f' && (fgLookupTable[p_char] & ASCII_HEX_CHARACTERS) != 0); } /** * Determine whether a char is an alphabetic character: a-z or A-Z * * @return true if the char is alphabetic, false otherwise */ private static boolean isAlpha(char p_char) { return ((p_char >= 'a' && p_char <= 'z') || (p_char >= 'A' && p_char <= 'Z' )); } /** * Determine whether a char is an alphanumeric: 0-9, a-z or A-Z * * @return true if the char is alphanumeric, false otherwise */ private static boolean isAlphanum(char p_char) { return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_ALPHA_NUMERIC) != 0); } /** * Determine whether a character is a reserved character: * ';', '/', '?', ':', '@', '&', '=', '+', '$', ',', '[', or ']' * * @return true if the string contains any reserved characters */ private static boolean isReservedCharacter(char p_char) { return (p_char <= ']' && (fgLookupTable[p_char] & RESERVED_CHARACTERS) != 0); } /** * Determine whether a char is an unreserved character. * * @return true if the char is unreserved, false otherwise */ private static boolean isUnreservedCharacter(char p_char) { return (p_char <= '~' && (fgLookupTable[p_char] & MASK_UNRESERVED_MASK) != 0); } /** * Determine whether a char is a URI character (reserved or * unreserved, not including '%' for escaped octets). * * @return true if the char is a URI character, false otherwise */ private static boolean isURICharacter (char p_char) { return (p_char <= '~' && (fgLookupTable[p_char] & MASK_URI_CHARACTER) != 0); } /** * Determine whether a char is a scheme character. * * @return true if the char is a scheme character, false otherwise */ private static boolean isSchemeCharacter (char p_char) { return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_SCHEME_CHARACTER) != 0); } /** * Determine whether a char is a userinfo character. * * @return true if the char is a userinfo character, false otherwise */ private static boolean isUserinfoCharacter (char p_char) { return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_USERINFO_CHARACTER) != 0); } /** * Determine whether a char is a path character. * * @return true if the char is a path character, false otherwise */ private static boolean isPathCharacter (char p_char) { return (p_char <= '~' && (fgLookupTable[p_char] & MASK_PATH_CHARACTER) != 0); } /** * Determine whether a given string contains only URI characters (also * called "uric" in RFC 2396). uric consist of all reserved * characters, unreserved characters and escaped characters. * * @return true if the string is comprised of uric, false otherwise */ private static boolean isURIString(String p_uric) { if (p_uric == null) { return false; } int end = p_uric.length(); char testChar = '\0'; for (int i = 0; i < end; i++) { testChar = p_uric.charAt(i); if (testChar == '%') { if (i+2 >= end || !isHex(p_uric.charAt(i+1)) || !isHex(p_uric.charAt(i+2))) { return false; } else { i += 2; continue; } } if (isURICharacter(testChar)) { continue; } else { return false; } } return true; } }




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