    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
    018package org.apache.commons.net.ftp.parser;
    019
    020import java.text.ParsePosition;
    021import java.text.SimpleDateFormat;
    022import java.time.Instant;
    023import java.util.Calendar;
    024import java.util.Date;
    025import java.util.GregorianCalendar;
    026import java.util.HashMap;
    027import java.util.Locale;
    028import java.util.TimeZone;
    029
    030import org.apache.commons.net.ftp.FTPFile;
    031import org.apache.commons.net.ftp.FTPFileEntryParserImpl;
    032
    033/**
    034 * Parser class for MSLT and MLSD replies. See RFC 3659.
    035 * <p>
    036 * Format is as follows:
    037 * </p>
    038 *
    039 * <pre>
    040 * entry            = [ facts ] SP pathname
    041 * facts            = 1*( fact ";" )
    042 * fact             = factname "=" value
    043 * factname         = "Size" / "Modify" / "Create" /
    044 *                    "Type" / "Unique" / "Perm" /
    045 *                    "Lang" / "Media-Type" / "CharSet" /
    046 * os-depend-fact / local-fact
    047 * os-depend-fact   = {IANA assigned OS name} "." token
    048 * local-fact       = "X." token
    049 * value            = *SCHAR
    050 *
    051 * Sample os-depend-fact:
    052 * UNIX.group=0;UNIX.mode=0755;UNIX.owner=0;
    053 * </pre>
    054 * <p>
    055 * A single control response entry (MLST) is returned with a leading space; multiple (data) entries are returned without any leading spaces. The parser requires
    056 * that the leading space from the MLST entry is removed. MLSD entries can begin with a single space if there are no facts.
    057 * </p>
    058 *
    059 * @since 3.0
    060 */
    061public class MLSxEntryParser extends FTPFileEntryParserImpl {
    062    // This class is immutable, so a single instance can be shared.
    063    private static final MLSxEntryParser INSTANCE = new MLSxEntryParser();
    064
    065    private static final HashMap<String, Integer> TYPE_TO_INT = new HashMap<>();
    066    static {
    067        TYPE_TO_INT.put("file", Integer.valueOf(FTPFile.FILE_TYPE));
    068        TYPE_TO_INT.put("cdir", Integer.valueOf(FTPFile.DIRECTORY_TYPE)); // listed directory
    069        TYPE_TO_INT.put("pdir", Integer.valueOf(FTPFile.DIRECTORY_TYPE)); // a parent dir
    070        TYPE_TO_INT.put("dir", Integer.valueOf(FTPFile.DIRECTORY_TYPE)); // dir or sub-dir
    071    }
    072
    073    private static final int[] UNIX_GROUPS = { // Groups in order of mode digits
    074            FTPFile.USER_ACCESS, FTPFile.GROUP_ACCESS, FTPFile.WORLD_ACCESS, };
    075
    076    private static final int[][] UNIX_PERMS = { // perm bits, broken down by octal int value
    077            /* 0 */ {}, /* 1 */ { FTPFile.EXECUTE_PERMISSION }, /* 2 */ { FTPFile.WRITE_PERMISSION },
    078            /* 3 */ { FTPFile.EXECUTE_PERMISSION, FTPFile.WRITE_PERMISSION }, /* 4 */ { FTPFile.READ_PERMISSION },
    079            /* 5 */ { FTPFile.READ_PERMISSION, FTPFile.EXECUTE_PERMISSION }, /* 6 */ { FTPFile.READ_PERMISSION, FTPFile.WRITE_PERMISSION },
    080            /* 7 */ { FTPFile.READ_PERMISSION, FTPFile.WRITE_PERMISSION, FTPFile.EXECUTE_PERMISSION }, };
    081
    082    public static MLSxEntryParser getInstance() {
    083        return INSTANCE;
    084    }
    085
    086    public static FTPFile parseEntry(final String entry) {
    087        return INSTANCE.parseFTPEntry(entry);
    088    }
    089
    090    /**
    091     * Parse a GMT time stamp of the form yyyyMMDDHHMMSS[.sss]
    092     *
    093     * @param timestamp the date-time to parse
    094     * @return a Calendar entry, may be {@code null}
    095     * @since 3.4
    096     */
    097    public static Calendar parseGMTdateTime(final String timestamp) {
    098        final SimpleDateFormat dateFormat;
    099        final boolean hasMillis;
    100        if (timestamp.contains(".")) {
    101            dateFormat = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
    102            hasMillis = true;
    103        } else {
    104            dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
    105            hasMillis = false;
    106        }
    107        final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");
    108        // both time zones need to be set for the parse to work OK
    109        dateFormat.setTimeZone(gmtTimeZone);
    110        final GregorianCalendar gCalendar = new GregorianCalendar(gmtTimeZone);
    111        final ParsePosition pos = new ParsePosition(0);
    112        dateFormat.setLenient(false); // We want to parse the whole string
    113        final Date parsed = dateFormat.parse(timestamp, pos);
    114        if (pos.getIndex() != timestamp.length()) {
    115            return null; // did not fully parse the input
    116        }
    117        gCalendar.setTime(parsed);
    118        if (!hasMillis) {
    119            gCalendar.clear(Calendar.MILLISECOND); // flag up missing ms units
    120        }
    121        return gCalendar;
    122    }
    123
    124    /**
    125     * Parse a GMT time stamp of the form yyyyMMDDHHMMSS[.sss]
    126     *
    127     * @param timestamp the date-time to parse
    128     * @return a Calendar entry, may be {@code null}
    129     * @since 3.9.0
    130     */
    131    public static Instant parseGmtInstant(final String timestamp) {
    132        return parseGMTdateTime(timestamp).toInstant();
    133    }
    134
    135    /**
    136     * Create the parser for MSLT and MSLD listing entries This class is immutable, so one can use {@link #getInstance()} instead.
    137     */
    138    public MLSxEntryParser() {
    139    }
    140
    141    // perm-fact = "Perm" "=" *pvals
    142    // pvals = "a" / "c" / "d" / "e" / "f" /
    143    // "l" / "m" / "p" / "r" / "w"
    144    private void doUnixPerms(final FTPFile file, final String valueLowerCase) {
    145        for (final char c : valueLowerCase.toCharArray()) {
    146            // TODO these are mostly just guesses at present
    147            switch (c) {
    148            case 'a': // (file) may APPEnd
    149                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    150                break;
    151            case 'c': // (dir) files may be created in the dir
    152                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    153                break;
    154            case 'd': // deletable
    155                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    156                break;
    157            case 'e': // (dir) can change to this dir
    158                file.setPermission(FTPFile.USER_ACCESS, FTPFile.READ_PERMISSION, true);
    159                break;
    160            case 'f': // (file) renamable
    161                // ?? file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    162                break;
    163            case 'l': // (dir) can be listed
    164                file.setPermission(FTPFile.USER_ACCESS, FTPFile.EXECUTE_PERMISSION, true);
    165                break;
    166            case 'm': // (dir) can create directory here
    167                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    168                break;
    169            case 'p': // (dir) entries may be deleted
    170                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    171                break;
    172            case 'r': // (files) file may be RETRieved
    173                file.setPermission(FTPFile.USER_ACCESS, FTPFile.READ_PERMISSION, true);
    174                break;
    175            case 'w': // (files) file may be STORed
    176                file.setPermission(FTPFile.USER_ACCESS, FTPFile.WRITE_PERMISSION, true);
    177                break;
    178            default:
    179                break;
    180            // ignore unexpected flag for now.
    181            } // switch
    182        } // each char
    183    }
    184
    185    @Override
    186    public FTPFile parseFTPEntry(final String entry) {
    187        if (entry.startsWith(" ")) {// leading space means no facts are present
    188            if (entry.length() > 1) { // is there a path name?
    189                final FTPFile file = new FTPFile();
    190                file.setRawListing(entry);
    191                file.setName(entry.substring(1));
    192                return file;
    193            }
    194            return null; // Invalid - no pathname
    195
    196        }
    197        final String parts[] = entry.split(" ", 2); // Path may contain space
    198        if (parts.length != 2 || parts[1].isEmpty()) {
    199            return null; // no space found or no file name
    200        }
    201        final String factList = parts[0];
    202        if (!factList.endsWith(";")) {
    203            return null;
    204        }
    205        final FTPFile file = new FTPFile();
    206        file.setRawListing(entry);
    207        file.setName(parts[1]);
    208        final String[] facts = factList.split(";");
    209        final boolean hasUnixMode = parts[0].toLowerCase(Locale.ENGLISH).contains("unix.mode=");
    210        for (final String fact : facts) {
    211            final String[] factparts = fact.split("=", -1); // Don't drop empty values
    212// Sample missing permission
    213// drwx------   2 mirror   mirror       4096 Mar 13  2010 subversion
    214// modify=20100313224553;perm=;type=dir;unique=811U282598;UNIX.group=500;UNIX.mode=0700;UNIX.owner=500; subversion
    215            if (factparts.length != 2) {
    216                return null; // invalid - there was no "=" sign
    217            }
    218            final String factname = factparts[0].toLowerCase(Locale.ENGLISH);
    219            final String factvalue = factparts[1];
    220            if (factvalue.isEmpty()) {
    221                continue; // nothing to see here
    222            }
    223            final String valueLowerCase = factvalue.toLowerCase(Locale.ENGLISH);
    224            if ("size".equals(factname) || "sizd".equals(factname)) {
    225                file.setSize(Long.parseLong(factvalue));
    226            } else if ("modify".equals(factname)) {
    227                final Calendar parsed = parseGMTdateTime(factvalue);
    228                if (parsed == null) {
    229                    return null;
    230                }
    231                file.setTimestamp(parsed);
    232            } else if ("type".equals(factname)) {
    233                final Integer intType = TYPE_TO_INT.get(valueLowerCase);
    234                if (intType == null) {
    235                    file.setType(FTPFile.UNKNOWN_TYPE);
    236                } else {
    237                    file.setType(intType.intValue());
    238                }
    239            } else if (factname.startsWith("unix.")) {
    240                final String unixfact = factname.substring("unix.".length()).toLowerCase(Locale.ENGLISH);
    241                if ("group".equals(unixfact)) {
    242                    file.setGroup(factvalue);
    243                } else if ("owner".equals(unixfact)) {
    244                    file.setUser(factvalue);
    245                } else if ("mode".equals(unixfact)) { // e.g. 0[1]755
    246                    final int off = factvalue.length() - 3; // only parse last 3 digits
    247                    for (int i = 0; i < 3; i++) {
    248                        final int ch = factvalue.charAt(off + i) - '0';
    249                        if (ch >= 0 && ch <= 7) { // Check it's valid octal
    250                            for (final int p : UNIX_PERMS[ch]) {
    251                                file.setPermission(UNIX_GROUPS[i], p, true);
    252                            }
    253                        } else {
    254                            // TODO should this cause failure, or can it be reported somehow?
    255                        }
    256                    } // digits
    257                } // mode
    258            } // unix.
    259            else if (!hasUnixMode && "perm".equals(factname)) { // skip if we have the UNIX.mode
    260                doUnixPerms(file, valueLowerCase);
    261            } // process "perm"
    262        } // each fact
    263        return file;
    264    }
    265}