001/*
002 * Copyright (c) 2009 The openGion Project.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
013 * either express or implied. See the License for the specific language
014 * governing permissions and limitations under the License.
015 */
016package org.opengion.hayabusa.servlet.multipart;
017
018import org.opengion.fukurou.util.Closer ;
019
020import java.io.IOException;
021
022import java.util.List;
023import java.util.ArrayList;
024import java.util.Locale ;
025
026import javax.servlet.http.HttpServletRequest;
027import javax.servlet.ServletInputStream;
028
029/**
030 * ファイルアップロード時のマルチパート処理のパーサーです。
031 *
032 * @og.group その他機能
033 *
034 * @version  4.0
035 * @author   Kazuhiko Hasegawa
036 * @since    JDK5.0,
037 */
038public class MultipartParser {
039        private final ServletInputStream in;
040        private final String boundary;
041        private FilePart lastFilePart;
042        private final byte[] buf = new byte[8 * 1024];
043        private static final String DEFAULT_ENCODING = "MS932";
044        private String encoding = DEFAULT_ENCODING;
045
046        /**
047         * マルチパート処理のパーサーオブジェクトを構築する、コンストラクター
048         *
049         * @og.rev 5.3.7.0 (2011/07/01) 最大容量オーバー時のエラーメッセージ変更
050         * @og.rev 5.5.2.6 (2012/05/25) maxSize で、0,またはマイナスで無制限
051         *
052         * @param       req             HttpServletRequestオブジェクト
053         * @param       maxSize 最大容量(0,またはマイナスで無制限)
054         * @throws IOException 入出力エラーが発生したとき
055         */
056        public MultipartParser( final HttpServletRequest req, final int maxSize ) throws IOException {
057                String type = null;
058                String type1 = req.getHeader("Content-Type");
059                String type2 = req.getContentType();
060System.out.println(type1);
061System.out.println(type2);
062                if(type1 == null && type2 != null) {
063                        type = type2;
064                }
065                else if(type2 == null && type1 != null) {
066                        type = type1;
067                }
068
069                else if(type1 != null && type2 != null) {
070                        type = (type1.length() > type2.length() ? type1 : type2);
071                }
072
073                if(type == null ||
074                                !type.toLowerCase(Locale.JAPAN).startsWith("multipart/form-data")) {
075                        throw new IOException("Posted content type isn't multipart/form-data");
076                }
077
078                int length = req.getContentLength();
079                // 5.5.2.6 (2012/05/25) maxSize で、0,またはマイナスで無制限
080//              if(length > maxSize) {
081                if( maxSize > 0 && length > maxSize ) {
082//                      throw new IOException("Posted content length of " + length +
083//                                                                      " exceeds limit of " + maxSize);
084                        throw new IOException("登録したファイルサイズが上限(" + ( maxSize / 1024 / 1024 ) + "MB)を越えています。"
085                                                                        + " 登録ファイル=" + ( length / 1024 / 1024 ) + "MB" ); // 5.3.7.0 (2011/07/01)
086                }
087
088                // 4.0.0 (2005/01/31) The local variable "boundary" shadows an accessible field with the same name and compatible type in class org.opengion.hayabusa.servlet.multipart.MultipartParser
089                String bound = extractBoundary(type);
090                if(bound == null) {
091                        throw new IOException("Separation boundary was not specified");
092                }
093
094                this.in = req.getInputStream();
095                this.boundary = bound;
096
097                String line = readLine();
098                if(line == null) {
099                        throw new IOException("Corrupt form data: premature ending");
100                }
101
102                if(!line.startsWith(boundary)) {
103                        throw new IOException("Corrupt form data: no leading boundary: " +
104                                                                                                                line + " != " + boundary);
105                }
106        }
107
108        /**
109         * エンコードを設定します。
110         *
111         * @param  encoding エンコード
112         */
113        public void setEncoding( final String encoding ) {
114                 this.encoding = encoding;
115         }
116
117        /**
118         * 次のパートを読み取ります。
119         *
120         * @og.rev 3.5.6.2 (2004/07/05) 文字列の連結にStringBuilderを使用します。
121         *
122         * @return      次のパート
123         * @throws IOException 入出力エラーが発生したとき
124         */
125        public Part readNextPart() throws IOException {
126                if(lastFilePart != null) {
127                        Closer.ioClose( lastFilePart.getInputStream() );                // 4.0.0 (2006/01/31) close 処理時の IOException を無視
128                        lastFilePart = null;
129                }
130
131                List<String> headers = new ArrayList<String>();
132
133                String line = readLine();
134                if(line == null) {
135                        return null;
136                }
137                else if(line.length() == 0) {
138                        return null;
139                }
140
141                while (line != null && line.length() > 0) {
142                        String nextLine = null;
143                        boolean getNextLine = true;
144                        StringBuilder buf = new StringBuilder( 100 );
145                        buf.append( line );
146                        while (getNextLine) {
147                                nextLine = readLine();
148                                if(nextLine != null
149                                                && (nextLine.startsWith(" ")
150                                                || nextLine.startsWith("\t"))) {
151                                        buf.append( nextLine );
152                                }
153                                else {
154                                        getNextLine = false;
155                                }
156                        }
157
158                        headers.add(buf.toString());
159                        line = nextLine;
160                }
161
162                if(line == null) {
163                        return null;
164                }
165
166                String name = null;
167                String filename = null;
168                String origname = null;
169                String contentType = "text/plain";
170
171                for( String headerline : headers ) {
172                        if(headerline.toLowerCase(Locale.JAPAN).startsWith("content-disposition:")) {
173                                String[] dispInfo = extractDispositionInfo(headerline);
174
175                                name = dispInfo[1];
176                                filename = dispInfo[2];
177                                origname = dispInfo[3];
178                        }
179                        else if(headerline.toLowerCase(Locale.JAPAN).startsWith("content-type:")) {
180                                String type = extractContentType(headerline);
181                                if(type != null) {
182                                        contentType = type;
183                                }
184                        }
185                }
186
187                if(filename == null) {
188                        return new ParamPart(name, in, boundary, encoding);
189                }
190                else {
191                        if( "".equals( filename ) ) {
192                                filename = null;
193                        }
194                        lastFilePart = new FilePart(name,in,boundary,contentType,filename,origname);
195                        return lastFilePart;
196                }
197        }
198
199        /**
200         * ローカル変数「境界」アクセス可能なフィールドを返します。
201         *
202         * @param       line    1行
203         *
204         * @return      境界文字列
205         * @see         org.opengion.hayabusa.servlet.multipart.MultipartParser
206         */
207        private String extractBoundary( final String line ) {
208                // 4.0.0 (2005/01/31) The local variable "boundary" shadows an accessible field with the same name and compatible type in class org.opengion.hayabusa.servlet.multipart.MultipartParser
209                int index = line.lastIndexOf("boundary=");
210                if(index == -1) {
211                        return null;
212                }
213                String bound = line.substring(index + 9);
214                if(bound.charAt(0) == '"') {
215                        index = bound.lastIndexOf('"');
216                        bound = bound.substring(1, index);
217                }
218
219                bound = "--" + bound;
220
221                return bound;
222        }
223
224        /**
225         * コンテンツの情報を返します。
226         *
227         * @param       origline        元の行
228         *
229         * @return      コンテンツの情報配列
230         * @throws IOException 入出力エラーが発生したとき
231         */
232        private String[] extractDispositionInfo( final String origline ) throws IOException {
233                String[] retval = new String[4];
234
235                String line = origline.toLowerCase(Locale.JAPAN);
236
237                int start = line.indexOf("content-disposition: ");
238                int end = line.indexOf(';');
239                if(start == -1 || end == -1) {
240                        throw new IOException("Content disposition corrupt: " + origline);
241                }
242                String disposition = line.substring(start + 21, end);
243                if(!"form-data".equals(disposition)) {
244                        throw new IOException("Invalid content disposition: " + disposition);
245                }
246
247                start = line.indexOf("name=\"", end);   // start at last semicolon
248                end = line.indexOf("\"", start + 7);     // skip name=\"
249                if(start == -1 || end == -1) {
250                        throw new IOException("Content disposition corrupt: " + origline);
251                }
252                String name = origline.substring(start + 6, end);
253
254                String filename = null;
255                String origname = null;
256                start = line.indexOf("filename=\"", end + 2);   // start after name
257                end = line.indexOf("\"", start + 10);                                   // skip filename=\"
258                if(start != -1 && end != -1) {                                                          // note the !=
259                        filename = origline.substring(start + 10, end);
260                        origname = filename;
261                        int slash =
262                                Math.max(filename.lastIndexOf('/'), filename.lastIndexOf('\\'));
263                        if(slash > -1) {
264                                filename = filename.substring(slash + 1);       // past last slash
265                        }
266                }
267
268                retval[0] = disposition;
269                retval[1] = name;
270                retval[2] = filename;
271                retval[3] = origname;
272                return retval;
273        }
274
275        /**
276         * コンテンツタイプの情報を返します。
277         *
278         * @param       origline        元の行
279         *
280         * @return      コンテンツタイプの情報
281         * @throws IOException 入出力エラーが発生したとき
282         */
283        private String extractContentType( final String origline ) throws IOException {
284                String contentType = null;
285
286                String line = origline.toLowerCase(Locale.JAPAN);
287
288                if(line.startsWith("content-type")) {
289                        int start = line.indexOf(' ');
290                        if(start == -1) {
291                                throw new IOException("Content type corrupt: " + origline);
292                        }
293                        contentType = line.substring(start + 1);
294                }
295                else if(line.length() > 0) { // no content type, so should be empty
296                        throw new IOException("Malformed line after disposition: " + origline);
297                }
298
299                return contentType;
300        }
301
302        /**
303         * 行を読み取ります。
304         *
305         * @return      読み取られた1行分
306         * @throws IOException 入出力エラーが発生したとき
307         */
308        private String readLine() throws IOException {
309                StringBuilder sbuf = new StringBuilder();
310                int result;
311
312                do {
313                        result = in.readLine(buf, 0, buf.length);
314                        if(result != -1) {
315                                sbuf.append(new String(buf, 0, result, encoding));
316                        }
317                } while (result == buf.length);
318
319                if(sbuf.length() == 0) {
320                        return null;
321                }
322
323                // 4.0.0 (2005/01/31) The method StringBuilder.setLength() should be avoided in favor of creating a new StringBuilder.
324                String rtn = sbuf.toString();
325                int len = sbuf.length();
326                if(len >= 2 && sbuf.charAt(len - 2) == '\r') {
327                        rtn = rtn.substring(0,len - 2);
328                }
329                else if(len >= 1 && sbuf.charAt(len - 1) == '\n') {
330                        rtn = rtn.substring(0,len - 1);
331                }
332                return rtn ;
333        }
334}