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1
28
29 package com.caucho.jstl.rt;
30
31 import com.caucho.jstl.NameValueTag;
32 import com.caucho.util.CharBuffer;
33 import com.caucho.util.L10N;
34
35 import javax.servlet.http.HttpServletRequest  ;
36 import javax.servlet.http.HttpServletResponse ;
37 import javax.servlet.jsp.JspException ;
38 import javax.servlet.jsp.JspWriter ;
39 import javax.servlet.jsp.PageContext ;
40 import javax.servlet.jsp.tagext.TagSupport ;
41 import java.io.IOException ;
42 import java.io.UnsupportedEncodingException ;
43 import java.net.URLEncoder ;
44
45 public class CoreUrlTag extends TagSupport implements NameValueTag {
46 private static L10N L = new L10N(CoreUrlTag.class);
47
48 private static String []_shortEncoding;
49
50 private String _value;
51 private String _context;
52
53 private String _var;
54 private String _scope;
55
56 private CharBuffer _url;
57
58
61 public void setValue(String value)
62 {
63 _value = value;
64 }
65
66
69 public void setContext(String context)
70 {
71 _context = context;
72 }
73
74
77 public void setVar(String var)
78 {
79 _var = var;
80 }
81
82
85 public void setScope(String scope)
86 {
87 _scope = scope;
88 }
89
90
93 public void addParam(String name, String value)
94 {
95 String encoding = this.pageContext.getResponse().getCharacterEncoding();
96
97 addParam(_url, name, value, encoding);
98 }
99
100 public int doStartTag() throws JspException
101 {
102 String value = _value;
103 String context = _context;
104
105 _url = normalizeURL(pageContext, value, context);
106
107 return EVAL_BODY_INCLUDE;
108 }
109
110 public int doEndTag() throws JspException
111 {
112 String value = encodeURL(pageContext, _url);
113
114 try {
115 if (_var == null) {
116 JspWriter out = pageContext.getOut();
117
118 out.print(value);
119 }
120 else
121 CoreSetTag.setValue(pageContext, _var, _scope, value);
122 } catch (IOException e) {
123 throw new JspException (e);
124 }
125
126 return EVAL_PAGE;
127 }
128
129 public static CharBuffer normalizeURL(PageContext pageContext,
130 String url, String context)
131 throws JspException
132 {
133 CharBuffer value = CharBuffer.allocate();
134
135 if (url == null)
136 url = "";
137
138 int slash = url.indexOf('/');
139 int colon = url.indexOf(':');
140
141 if (colon > 0 && colon < slash) {
142 value.append(url);
143 }
144 else if (slash == 0) {
145 HttpServletRequest request;
146 request = (HttpServletRequest ) pageContext.getRequest();
147
148 if (context != null) {
149 value.append(context);
150 value.append(url);
151 }
152 else {
153 value.append(request.getContextPath());
154 value.append(url);
155 }
156 }
157 else {
158 if (context != null) {
159 value.append(context);
160 value.append(url);
161 }
162 else
163 value.append(url);
164 }
165
166 return value;
167 }
168
169 public static CharBuffer addParam(CharBuffer url,
170 String name, String value,
171 String encoding)
172 {
173 if (url.indexOf('?') < 0)
174 url.append('?');
175 else
176 url.append("&");
177
178 addEncodedString(url, name, encoding);
179 url.append('=');
180 addEncodedString(url, value, encoding);
181
182 return url;
183 }
184
185
186
189 public static CharBuffer addEncodedString(CharBuffer cb,
190 String value,
191 String encoding)
192 {
193 if (encoding == null || encoding.equalsIgnoreCase("iso-8859-1"))
194 return addEncodedLatin1(cb, value);
195 else if (encoding.equalsIgnoreCase("utf8") ||
196 encoding.equalsIgnoreCase("utf-8"))
197 return addEncodedUTF8(cb, value);
198 else {
199 try {
200 cb.append(URLEncoder.encode(value, encoding));
201 } catch (UnsupportedEncodingException e) {
202 throw new RuntimeException (e);
203 }
204
205 return cb;
206 }
207 }
208
209
212 public static CharBuffer addEncodedLatin1(CharBuffer cb, String value)
213 {
214 int len = value.length();
215
216 for (int i = 0; i < len; i++) {
217 char ch = value.charAt(i);
218
219 if (ch < 0x80)
220 cb.append(_shortEncoding[ch]);
221 else {
222 cb.append('%');
223 cb.append(hex(ch >> 4));
224 cb.append(hex(ch & 0xf));
225 }
226 }
227
228 return cb;
229 }
230
231
234 public static CharBuffer addEncodedUTF8(CharBuffer cb, String value)
235 {
236 int len = value.length();
237
238 for (int i = 0; i < len; i++) {
239 char ch = value.charAt(i);
240
241 if (ch < 0x80)
242 cb.append(_shortEncoding[ch]);
243 else if (ch < 0x800) {
244
246 int d1 = 0xc0 + ((ch >> 6) & 0x1f);
247 int d2 = 0x80 + (ch & 0x3f);
248
249 cb.append('%');
250 cb.append(hex(d1 >> 4));
251 cb.append(hex(d1 & 0xf));
252 cb.append('%');
253 cb.append(hex(d2 >> 4));
254 cb.append(hex(d2 & 0xf));
255 }
256 else {
257
259 int d1 = 0xe0 + ((ch >> 12) & 0xf);
260 int d2 = 0x80 + ((ch >> 6) & 0x3f);
261 int d3 = 0x80 + (ch & 0x3f);
262
263 cb.append('%');
264 cb.append(hex(d1 >> 4));
265 cb.append(hex(d1 & 0xf));
266 cb.append('%');
267 cb.append(hex(d2 >> 4));
268 cb.append(hex(d2 & 0xf));
269 cb.append('%');
270 cb.append(hex(d3 >> 4));
271 cb.append(hex(d3 & 0xf));
272 }
273 }
274
275 return cb;
276 }
277
278 public static String encodeURL(PageContext pageContext, CharBuffer url)
279 {
280 String value = url.toString();
281
282 int colon = value.indexOf(':');
283 int slash = value.indexOf('/');
284
285 if (colon < slash && slash > 0)
286 return value;
287 else
288 return ((HttpServletResponse ) pageContext.getResponse()).encodeURL(value);
289
290
296 }
297
298
299 private static char hex(int d)
300 {
301 d = d & 0xf;
302
303 if (d < 10)
304 return (char) ('0' + d);
305 else
306 return (char) ('A' + d - 10);
307 }
308
309 static {
310 _shortEncoding = new String [128];
311
312 for (int i = 0; i < _shortEncoding.length; i++)
313 _shortEncoding[i] = "%" + hex(i / 16) + hex(i);
314
315 for (int i = 'a'; i <= 'z'; i++)
316 _shortEncoding[i] = String.valueOf((char) i);
317
318 for (int i = 'A'; i <= 'Z'; i++)
319 _shortEncoding[i] = String.valueOf((char) i);
320
321 for (int i = '0'; i <= '9'; i++)
322 _shortEncoding[i] = String.valueOf((char) i);
323
324 _shortEncoding[' '] = "+";
325 _shortEncoding['-'] = "-";
326 _shortEncoding['_'] = "_";
327 _shortEncoding['.'] = ".";
328 _shortEncoding['!'] = "!";
329 _shortEncoding['~'] = "~";
330 _shortEncoding['\''] = "\'";
331 }
332 }
333 |
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