Source Code Cross Referenced for EmailValidator.java in  » Library » Apache-commons-validator-1.3.1-src » org » apache » commons » validator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons validator 1.3.1 src » org.apache.commons.validator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.commons.validator;
018:
019:        import org.apache.oro.text.perl.Perl5Util;
020:
021:        /**
022:         * <p>Perform email validations.</p>
023:         * <p>
024:         * This class is a Singleton; you can retrieve the instance via the getInstance() method.
025:         * </p>
026:         * <p>
027:         * Based on a script by <a href="mailto:stamhankar@hotmail.com">Sandeep V. Tamhankar</a>
028:         * http://javascript.internet.com
029:         * </p>
030:         * <p>
031:         * This implementation is not guaranteed to catch all possible errors in an email address.
032:         * For example, an address like nobody@noplace.somedog will pass validator, even though there
033:         * is no TLD "somedog"
034:         * </p>.
035:         *
036:         * @version $Revision: 478560 $ $Date: 2006-11-23 13:09:27 +0000 (Thu, 23 Nov 2006) $
037:         * @since Validator 1.1
038:         */
039:        public class EmailValidator {
040:
041:            private static final String SPECIAL_CHARS = "\\000-\\037\\(\\)<>@,;:'\\\\\\\"\\.\\[\\]\\177";
042:            private static final String VALID_CHARS = "[^\\s" + SPECIAL_CHARS
043:                    + "]";
044:            private static final String QUOTED_USER = "(\"[^\"]*\")";
045:            private static final String ATOM = VALID_CHARS + '+';
046:            private static final String WORD = "((" + VALID_CHARS + "|')+|"
047:                    + QUOTED_USER + ")";
048:
049:            // Each pattern must be surrounded by /
050:            private static final String LEGAL_ASCII_PATTERN = "/^[\\000-\\177]+$/";
051:            private static final String EMAIL_PATTERN = "/^(.+)@(.+)$/";
052:            private static final String IP_DOMAIN_PATTERN = "/^\\[(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})\\]$/";
053:            private static final String TLD_PATTERN = "/^([a-zA-Z]+)$/";
054:
055:            private static final String USER_PATTERN = "/^\\s*" + WORD + "(\\."
056:                    + WORD + ")*$/";
057:            private static final String DOMAIN_PATTERN = "/^" + ATOM + "(\\."
058:                    + ATOM + ")*\\s*$/";
059:            private static final String ATOM_PATTERN = "/(" + ATOM + ")/";
060:
061:            /**
062:             * Singleton instance of this class.
063:             */
064:            private static final EmailValidator EMAIL_VALIDATOR = new EmailValidator();
065:
066:            /**
067:             * Returns the Singleton instance of this validator.
068:             * @return singleton instance of this validator.
069:             */
070:            public static EmailValidator getInstance() {
071:                return EMAIL_VALIDATOR;
072:            }
073:
074:            /**
075:             * Protected constructor for subclasses to use.
076:             */
077:            protected EmailValidator() {
078:                super ();
079:            }
080:
081:            /**
082:             * <p>Checks if a field has a valid e-mail address.</p>
083:             *
084:             * @param email The value validation is being performed on.  A <code>null</code>
085:             * value is considered invalid.
086:             * @return true if the email address is valid.
087:             */
088:            public boolean isValid(String email) {
089:                if (email == null) {
090:                    return false;
091:                }
092:
093:                Perl5Util matchAsciiPat = new Perl5Util();
094:                if (!matchAsciiPat.match(LEGAL_ASCII_PATTERN, email)) {
095:                    return false;
096:                }
097:
098:                email = stripComments(email);
099:
100:                // Check the whole email address structure
101:                Perl5Util emailMatcher = new Perl5Util();
102:                if (!emailMatcher.match(EMAIL_PATTERN, email)) {
103:                    return false;
104:                }
105:
106:                if (email.endsWith(".")) {
107:                    return false;
108:                }
109:
110:                if (!isValidUser(emailMatcher.group(1))) {
111:                    return false;
112:                }
113:
114:                if (!isValidDomain(emailMatcher.group(2))) {
115:                    return false;
116:                }
117:
118:                return true;
119:            }
120:
121:            /**
122:             * Returns true if the domain component of an email address is valid.
123:             * @param domain being validatied.
124:             * @return true if the email address's domain is valid.
125:             */
126:            protected boolean isValidDomain(String domain) {
127:                boolean symbolic = false;
128:                Perl5Util ipAddressMatcher = new Perl5Util();
129:
130:                if (ipAddressMatcher.match(IP_DOMAIN_PATTERN, domain)) {
131:                    if (!isValidIpAddress(ipAddressMatcher)) {
132:                        return false;
133:                    } else {
134:                        return true;
135:                    }
136:                } else {
137:                    // Domain is symbolic name
138:                    Perl5Util domainMatcher = new Perl5Util();
139:                    symbolic = domainMatcher.match(DOMAIN_PATTERN, domain);
140:                }
141:
142:                if (symbolic) {
143:                    if (!isValidSymbolicDomain(domain)) {
144:                        return false;
145:                    }
146:                } else {
147:                    return false;
148:                }
149:
150:                return true;
151:            }
152:
153:            /**
154:             * Returns true if the user component of an email address is valid.
155:             * @param user being validated
156:             * @return true if the user name is valid.
157:             */
158:            protected boolean isValidUser(String user) {
159:                Perl5Util userMatcher = new Perl5Util();
160:                return userMatcher.match(USER_PATTERN, user);
161:            }
162:
163:            /**
164:             * Validates an IP address. Returns true if valid.
165:             * @param ipAddressMatcher Pattren matcher
166:             * @return true if the ip address is valid.
167:             */
168:            protected boolean isValidIpAddress(Perl5Util ipAddressMatcher) {
169:                for (int i = 1; i <= 4; i++) {
170:                    String ipSegment = ipAddressMatcher.group(i);
171:                    if (ipSegment == null || ipSegment.length() <= 0) {
172:                        return false;
173:                    }
174:
175:                    int iIpSegment = 0;
176:
177:                    try {
178:                        iIpSegment = Integer.parseInt(ipSegment);
179:                    } catch (NumberFormatException e) {
180:                        return false;
181:                    }
182:
183:                    if (iIpSegment > 255) {
184:                        return false;
185:                    }
186:
187:                }
188:                return true;
189:            }
190:
191:            /**
192:             * Validates a symbolic domain name.  Returns true if it's valid.
193:             * @param domain symbolic domain name
194:             * @return true if the symbolic domain name is valid.
195:             */
196:            protected boolean isValidSymbolicDomain(String domain) {
197:                String[] domainSegment = new String[10];
198:                boolean match = true;
199:                int i = 0;
200:                Perl5Util atomMatcher = new Perl5Util();
201:                while (match) {
202:                    match = atomMatcher.match(ATOM_PATTERN, domain);
203:                    if (match) {
204:                        domainSegment[i] = atomMatcher.group(1);
205:                        int l = domainSegment[i].length() + 1;
206:                        domain = (l >= domain.length()) ? "" : domain
207:                                .substring(l);
208:
209:                        i++;
210:                    }
211:                }
212:
213:                int len = i;
214:
215:                // Make sure there's a host name preceding the domain.
216:                if (len < 2) {
217:                    return false;
218:                }
219:
220:                // TODO: the tld should be checked against some sort of configurable 
221:                // list
222:                String tld = domainSegment[len - 1];
223:                if (tld.length() > 1) {
224:                    Perl5Util matchTldPat = new Perl5Util();
225:                    if (!matchTldPat.match(TLD_PATTERN, tld)) {
226:                        return false;
227:                    }
228:                } else {
229:                    return false;
230:                }
231:
232:                return true;
233:            }
234:
235:            /**
236:             *   Recursively remove comments, and replace with a single space.  The simpler
237:             *   regexps in the Email Addressing FAQ are imperfect - they will miss escaped
238:             *   chars in atoms, for example.
239:             *   Derived From    Mail::RFC822::Address
240:             * @param emailStr The email address
241:             * @return address with comments removed.
242:             */
243:            protected String stripComments(String emailStr) {
244:                String input = emailStr;
245:                String result = emailStr;
246:                String commentPat = "s/^((?:[^\"\\\\]|\\\\.)*(?:\"(?:[^\"\\\\]|\\\\.)*\"(?:[^\"\\\\]|\111111\\\\.)*)*)\\((?:[^()\\\\]|\\\\.)*\\)/$1 /osx";
247:                Perl5Util commentMatcher = new Perl5Util();
248:                result = commentMatcher.substitute(commentPat, input);
249:                // This really needs to be =~ or Perl5Matcher comparison
250:                while (!result.equals(input)) {
251:                    input = result;
252:                    result = commentMatcher.substitute(commentPat, input);
253:                }
254:                return result;
255:
256:            }
257:        }
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