1
22
23 package com.liferay.portal.servlet.filters.strip;
24
25 import com.liferay.portal.kernel.log.Log;
26 import com.liferay.portal.kernel.log.LogFactoryUtil;
27 import com.liferay.portal.kernel.portlet.LiferayWindowState;
28 import com.liferay.portal.kernel.util.ByteArrayMaker;
29 import com.liferay.portal.kernel.util.CharPool;
30 import com.liferay.portal.kernel.util.GetterUtil;
31 import com.liferay.portal.kernel.util.HttpUtil;
32 import com.liferay.portal.kernel.util.JavaConstants;
33 import com.liferay.portal.kernel.util.ParamUtil;
34 import com.liferay.portal.kernel.util.StringPool;
35 import com.liferay.portal.kernel.util.Validator;
36 import com.liferay.portal.servlet.filters.BasePortalFilter;
37 import com.liferay.portal.util.MinifierUtil;
38 import com.liferay.util.servlet.ServletResponseUtil;
39
40 import java.io.IOException;
41
42 import javax.servlet.FilterChain;
43 import javax.servlet.ServletException;
44 import javax.servlet.http.HttpServletRequest;
45 import javax.servlet.http.HttpServletResponse;
46
47
54 public class StripFilter extends BasePortalFilter {
55
56 public static final String SKIP_FILTER =
57 StripFilter.class.getName() + "SKIP_FILTER";
58
59 protected boolean hasMarker(byte[] oldByteArray, int pos, char[] marker) {
60 if ((pos + marker.length) >= oldByteArray.length) {
61 return false;
62 }
63
64 for (int i = 0; i < marker.length; i++) {
65 char c = marker[i];
66
67 char oldC = (char)oldByteArray[pos + i + 1];
68
69 if ((c != oldC) &&
70 (Character.toUpperCase(c) != oldC)) {
71
72 return false;
73 }
74 }
75
76 return true;
77 }
78
79 protected boolean isAlreadyFiltered(HttpServletRequest request) {
80 if (request.getAttribute(SKIP_FILTER) != null) {
81 return true;
82 }
83 else {
84 return false;
85 }
86 }
87
88 protected boolean isInclude(HttpServletRequest request) {
89 String uri = (String)request.getAttribute(
90 JavaConstants.JAVAX_SERVLET_INCLUDE_REQUEST_URI);
91
92 if (uri == null) {
93 return false;
94 }
95 else {
96 return true;
97 }
98 }
99
100 protected boolean isStrip(HttpServletRequest request) {
101 if (!ParamUtil.getBoolean(request, _STRIP, true)) {
102 return false;
103 }
104 else {
105
106
110 String lifecycle = ParamUtil.getString(request, "p_p_lifecycle");
111
112 if ((lifecycle.equals("1") &&
113 LiferayWindowState.isExclusive(request)) ||
114 lifecycle.equals("2")) {
115
116 return false;
117 }
118 else {
119 return true;
120 }
121 }
122 }
123
124 protected void processFilter(
125 HttpServletRequest request, HttpServletResponse response,
126 FilterChain filterChain)
127 throws IOException, ServletException {
128
129 String completeURL = HttpUtil.getCompleteURL(request);
130
131 if (isStrip(request) && !isInclude(request) &&
132 !isAlreadyFiltered(request)) {
133
134 if (_log.isDebugEnabled()) {
135 _log.debug("Stripping " + completeURL);
136 }
137
138 request.setAttribute(SKIP_FILTER, Boolean.TRUE);
139
140 StripResponse stripResponse = new StripResponse(response);
141
142 processFilter(
143 StripFilter.class, request, stripResponse, filterChain);
144
145 String contentType = GetterUtil.getString(
146 stripResponse.getContentType()).toLowerCase();
147
148 byte[] oldByteArray = stripResponse.getData();
149
150 if ((oldByteArray != null) && (oldByteArray.length > 0)) {
151 byte[] newByteArray = null;
152 int newByteArrayPos = 0;
153
154 if (_log.isDebugEnabled()) {
155 _log.debug("Stripping content of type " + contentType);
156 }
157
158 if (contentType.indexOf("text/") != -1) {
159 Object[] value = strip(oldByteArray);
160
161 newByteArray = (byte[])value[0];
162 newByteArrayPos = (Integer)value[1];
163 }
164 else {
165 newByteArray = oldByteArray;
166 newByteArrayPos = oldByteArray.length;
167 }
168
169 ServletResponseUtil.write(
170 response, newByteArray, newByteArrayPos);
171 }
172 }
173 else {
174 if (_log.isDebugEnabled()) {
175 _log.debug("Not stripping " + completeURL);
176 }
177
178 processFilter(StripFilter.class, request, response, filterChain);
179 }
180 }
181
182 protected Object[] strip(byte[] oldByteArray) throws IOException {
183 byte[] newByteArray = new byte[oldByteArray.length];
184 int newByteArrayPos = 0;
185
186 int state = _STATE_NORMAL;
187
188 boolean removeStartingWhitespace = true;
189
190 ByteArrayMaker scriptBytes = new ByteArrayMaker();
191 ByteArrayMaker styleBytes = new ByteArrayMaker();
192
193 for (int i = 0; i < oldByteArray.length; i++) {
194 byte b = oldByteArray[i];
195
196 char c = (char)b;
197
198 if (c == CharPool.LESS_THAN) {
199 if (state == _STATE_NORMAL) {
200 if (hasMarker(oldByteArray, i, _MARKER_PRE_OPEN) ||
201 hasMarker(oldByteArray, i, _MARKER_TEXTAREA_OPEN)) {
202
203 state = _STATE_IGNORE;
204 }
205 else if (hasMarker(oldByteArray, i, _MARKER_DIV_CLOSE) ||
206 hasMarker(oldByteArray, i, _MARKER_FORM_CLOSE) ||
207 hasMarker(oldByteArray, i, _MARKER_LI_CLOSE) ||
208 hasMarker(oldByteArray, i, _MARKER_SCRIPT_CLOSE) ||
209 hasMarker(oldByteArray, i, _MARKER_STYLE_CLOSE) ||
210 hasMarker(oldByteArray, i, _MARKER_TABLE_CLOSE) ||
211 hasMarker(oldByteArray, i, _MARKER_TD_CLOSE) ||
212 hasMarker(oldByteArray, i, _MARKER_TD_OPEN) ||
213 hasMarker(oldByteArray, i, _MARKER_TR_CLOSE) ||
214 hasMarker(oldByteArray, i, _MARKER_TR_OPEN) ||
215 hasMarker(oldByteArray, i, _MARKER_UL_CLOSE)) {
216
217 state = _STATE_FOUND_ELEMENT;
218 }
219 else if (hasMarker(
220 oldByteArray, i, _MARKER_JAVASCRIPT_OPEN) ||
221 hasMarker(oldByteArray, i, _MARKER_SCRIPT_OPEN)) {
222
223 state = _STATE_MINIFY_SCRIPT;
224 }
225 else if (hasMarker(oldByteArray, i, _MARKER_STYLE_OPEN)) {
226 state = _STATE_MINIFY_STYLE;
227 }
228 }
229 else if (state == _STATE_IGNORE) {
230 if (hasMarker(oldByteArray, i, _MARKER_PRE_CLOSE) ||
231 hasMarker(oldByteArray, i, _MARKER_TEXTAREA_CLOSE)) {
232
233 state = _STATE_NORMAL;
234 }
235 }
236 else if (state == _STATE_MINIFY_SCRIPT) {
237 if (hasMarker(oldByteArray, i, _MARKER_SCRIPT_CLOSE)) {
238 state = _STATE_NORMAL;
239
240 String scriptContent = scriptBytes.toString(
241 StringPool.UTF8);
242
243 scriptBytes = new ByteArrayMaker();
244
245 int pos = scriptContent.indexOf(CharPool.GREATER_THAN);
246
247 scriptContent = scriptContent.substring(pos + 1).trim();
248
249 if (Validator.isNull(scriptContent)) {
250 i += _MARKER_SCRIPT_CLOSE.length;
251
252 continue;
253 }
254
255 scriptContent = MinifierUtil.minifyJavaScript(
256 scriptContent);
257
258 scriptContent =
259 _CDATA_OPEN + scriptContent + _CDATA_CLOSE;
260
261 if (Validator.isNull(scriptContent)) {
262 i += _MARKER_SCRIPT_CLOSE.length;
263
264 continue;
265 }
266
267 scriptContent = _SCRIPT_TYPE_JAVASCRIPT + scriptContent;
268
269 byte[] scriptContentBytes = scriptContent.getBytes(
270 StringPool.UTF8);
271
272 for (byte curByte : scriptContentBytes) {
273 newByteArray[newByteArrayPos++] = curByte;
274 }
275
276 state = _STATE_FOUND_ELEMENT;
277 }
278 }
279 else if (state == _STATE_MINIFY_STYLE) {
280 if (hasMarker(oldByteArray, i, _MARKER_STYLE_CLOSE)) {
281 state = _STATE_NORMAL;
282
283 String styleContent = styleBytes.toString(
284 StringPool.UTF8);
285
286 styleBytes = new ByteArrayMaker();
287
288 styleContent = styleContent.substring(
289 _STYLE_TYPE_CSS.length()).trim();
290
291 if (Validator.isNull(styleContent)) {
292 i += _MARKER_STYLE_CLOSE.length;
293
294 continue;
295 }
296
297 styleContent = MinifierUtil.minifyCss(styleContent);
298
299 if (Validator.isNull(styleContent)) {
300 i += _MARKER_STYLE_CLOSE.length;
301
302 continue;
303 }
304
305 styleContent = _STYLE_TYPE_CSS + styleContent;
306
307 byte[] styleContentBytes = styleContent.getBytes(
308 StringPool.UTF8);
309
310 for (byte curByte : styleContentBytes) {
311 newByteArray[newByteArrayPos++] = curByte;
312 }
313
314 state = _STATE_FOUND_ELEMENT;
315 }
316 }
317 }
318 else if (c == CharPool.GREATER_THAN) {
319 if (state == _STATE_FOUND_ELEMENT) {
320 state = _STATE_NORMAL;
321
322 newByteArray[newByteArrayPos++] = b;
323
324 while ((i + 1) < oldByteArray.length) {
325 char nextChar = (char)oldByteArray[i + 1];
326
327 if (Validator.isWhitespace(nextChar)) {
328 i++;
329 }
330 else {
331 break;
332 }
333 }
334
335 continue;
336 }
337 }
338
339 if (state == _STATE_NORMAL) {
340 if ((i + 1) < oldByteArray.length) {
341 if (removeStartingWhitespace) {
342 if (Validator.isWhitespace(c)) {
343 continue;
344 }
345 else {
346 removeStartingWhitespace = false;
347 }
348 }
349
350 if ((c == CharPool.NEW_LINE) ||
351 (c == CharPool.RETURN) ||
352 (c == CharPool.TAB)) {
353
354 char nextChar = (char)oldByteArray[i + 1];
355
356 if ((nextChar == CharPool.NEW_LINE) ||
357 (nextChar == CharPool.RETURN) ||
358 (nextChar == CharPool.TAB)) {
359
360 continue;
361 }
362 }
363 }
364 }
365
366 if (state == _STATE_MINIFY_SCRIPT) {
367 scriptBytes.write(b);
368 }
369 else if (state == _STATE_MINIFY_STYLE) {
370 styleBytes.write(b);
371 }
372 else {
373 newByteArray[newByteArrayPos++] = b;
374 }
375 }
376
377 if (newByteArrayPos > 1) {
378 for (int i = newByteArrayPos - 1; i > 0; i--) {
379 byte b = newByteArray[i];
380
381 char c = (char)b;
382
383 if (Validator.isWhitespace(c)) {
384 newByteArrayPos--;
385 }
386 else {
387 break;
388 }
389 }
390 }
391
392 if (state == _STATE_MINIFY_SCRIPT) {
393 _log.error("Missing </script>");
394 }
395 else if (state == _STATE_MINIFY_STYLE) {
396 _log.error("Missing </style>");
397 }
398
399 return new Object[] {newByteArray, newByteArrayPos};
400 }
401
402 private static final String _CDATA_CLOSE = "/*]]>*/";
403
404 private static final String _CDATA_OPEN = "/*<![CDATA[*/";
405
406 private static final char[] _MARKER_DIV_CLOSE = "/div>".toCharArray();
407
408 private static final char[] _MARKER_FORM_CLOSE = "/form>".toCharArray();
409
410 private static final char[] _MARKER_JAVASCRIPT_OPEN =
411 "script type=\"text/javascript\">".toCharArray();
412
413 private static final char[] _MARKER_LI_CLOSE = "/li>".toCharArray();
414
415 private static final char[] _MARKER_PRE_CLOSE = "/pre>".toCharArray();
416
417 private static final char[] _MARKER_PRE_OPEN = "pre>".toCharArray();
418
419 private static final char[] _MARKER_SCRIPT_OPEN = "script>".toCharArray();
420
421 private static final char[] _MARKER_SCRIPT_CLOSE = "/script>".toCharArray();
422
423 private static final char[] _MARKER_STYLE_OPEN =
424 "style type=\"text/css\">".toCharArray();
425
426 private static final char[] _MARKER_STYLE_CLOSE = "/style>".toCharArray();
427
428 private static final char[] _MARKER_TABLE_CLOSE = "/table>".toCharArray();
429
430 private static final char[] _MARKER_TD_CLOSE = "/td>".toCharArray();
431
432 private static final char[] _MARKER_TD_OPEN = "td>".toCharArray();
433
434 private static final char[] _MARKER_TR_CLOSE = "/tr>".toCharArray();
435
436 private static final char[] _MARKER_TR_OPEN = "tr>".toCharArray();
437
438 private static final char[] _MARKER_TEXTAREA_CLOSE =
439 "/textarea>".toCharArray();
440
441 private static final char[] _MARKER_TEXTAREA_OPEN =
442 "textarea ".toCharArray();
443
444 private static final char[] _MARKER_UL_CLOSE = "/ul>".toCharArray();
445
446 private static final String _SCRIPT_TYPE_JAVASCRIPT =
447 "<script type=\"text/javascript\">";
448
449 private static final int _STATE_FOUND_ELEMENT = 3;
450
451 private static final int _STATE_IGNORE = 1;
452
453 private static final int _STATE_MINIFY_SCRIPT = 4;
454
455 private static final int _STATE_MINIFY_STYLE = 5;
456
457 private static final int _STATE_NORMAL = 0;
458
459 private static final String _STYLE_TYPE_CSS = "<style type=\"text/css\">";
460
461 private static final String _STRIP = "strip";
462
463 private static Log _log = LogFactoryUtil.getLog(StripFilter.class);
464
465 }