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1 package com.sslexplorer.core;
2
3 import java.io.BufferedReader  ;
4 import java.io.IOException ;
5 import java.io.InputStream ;
6 import java.io.InputStreamReader ;
7 import java.net.URL ;
8 import java.util.ArrayList ;
9 import java.util.List ;
10
11 import javax.servlet.jsp.tagext.BodyTagSupport ;
12
13 import org.apache.commons.logging.Log;
14 import org.apache.commons.logging.LogFactory;
15
16 import com.sslexplorer.boot.Util;
17
18 public class BrowserChecker extends BodyTagSupport {
19
20 final static Log log = LogFactory.getLog(BrowserChecker.class);
21
22 public static final String BROWSER_IE = "IE";
23 public static final String BROWSER_OPERA = "Opera";
24 public static final String BROWSER_SAFARI = "Safari";
25 public static final String BROWSER_FIREFOX = "Firefox";
26
27 static List <Browser> browsers = new ArrayList <Browser>();
28 static {
29 URL u = BrowserChecker.class.getResource("/META-INF/userAgents.properties");
30 if(u == null) {
31 log.error("Failed to find /META-INF/userAgents.txt, cannot detect browser.");
32 }
33 else {
34 InputStream in = null;
35 try {
36 in = u.openStream();
37 BufferedReader r = new BufferedReader (new InputStreamReader (in));
38 String line;
39 while ( ( line = r.readLine() ) != null) {
40 line = line.trim();
41 if(!line.startsWith("#") && line.length() != 0) {
42 try {
43 browsers.add(new Browser(line));
44 }
45 catch(Exception e) {
46 log.error("Syntax error '" + line + "'.");
47 }
48 }
49 }
50 }
51 catch(IOException ioe) {
52 log.error("Failed to load /META-INF/userAgents.txt", ioe);
53 }
54 finally {
55 Util.closeStream(in);
56 }
57 }
58 }
59
60 private Browser browser;
61
62 public BrowserChecker() {
63 }
64
65 public BrowserChecker(String userAgent) {
66 setUserAgent(userAgent);
67 }
68
69 public void setUserAgent(String userAgent) {
70 for(Browser b : browsers) {
71 if(userAgent.contains(b.getUserAgentPattern())) {
72 browser = b;
73 break;
74 }
75 }
76
77 }
78
79 public Browser getBrowser() {
80 return browser;
81 }
82
83 public boolean isBrowserVersion(String name, int version) {
84 return isBrowserVersionExpression(name, version == -1 ? "*" : "=" + version);
85 }
86
87 public boolean isBrowserVersionExpression(String name, String versionExpression) {
88 return isBrowser(name) && isVersionExpression(versionExpression);
89 }
90
91 private boolean isBrowser(String name) {
92 return browser != null && browser.getName().equalsIgnoreCase(name);
93 }
94
95 private boolean isVersion(int version) {
96 return isVersionExpression("=" + version);
97 }
98
99 private boolean isVersionExpression(String versionExpression) {
100
101 boolean not = false;
102
103 if(versionExpression.startsWith("!")) {
105 not = true;
106 versionExpression = versionExpression.substring(1);
107 }
108 boolean gt = false;
109 if(versionExpression.startsWith("+")) {
110 gt = true;
111 versionExpression = versionExpression.substring(1);
112 }
113 boolean lt = false;
114 if(versionExpression.startsWith("-")) {
115 lt = true;
116 versionExpression = versionExpression.substring(1);
117 }
118 boolean eq = false;
119 if(versionExpression.startsWith("=")) {
120 eq = true;
121 versionExpression = versionExpression.substring(1);
122 }
123
124 boolean ok = false;
125
126 if(versionExpression.equals("*")) {
128 ok = true;
129 }
130 else {
131 int version = Integer.parseInt(versionExpression);
132
133 if(eq) {
135 ok = lt ? browser.getVersion() <= version : ( gt ? browser.getVersion() >= version : ( browser.getVersion() == version ) );
136 }
137 else {
138 ok = lt ? browser.getVersion() < version : ( gt ? browser.getVersion() > version : false );
139 }
140 }
141
142
144 if(not) {
145 ok = !ok;
146 }
147
148 return ok;
149 }
150
151 public static class Browser {
152 String userAgentPattern;
153 String name;
154 int version = -1;
155
156 Browser(String line) {
157 String [] arr = line.split(",");
158 userAgentPattern = arr[0];
159 name = arr[1];
160 if(arr.length > 2) {
161 version = arr[2].equals("") ? -1 : Integer.parseInt(arr[2]);
162 }
163 }
164
165 public String getUserAgentPattern() {
166 return userAgentPattern;
167 }
168
169 public String getName() {
170 return name;
171 }
172
173 public int getVersion() {
174 return version;
175 }
176
177 }
178
179 }
180
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