Caldavsync Sources: src/net/fortuna/ical4j/util/Uris.java@fb9019fb1bf7

Import initial revisions of existing project AndroidCaldavSyncAdapater,
forked from upstream repository at 27e8a0f8495c92e0780d450bdf0c7cec77a03a55.

     1 /**

     2  * Copyright (c) 2012, Ben Fortuna

     3  * All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  *

     9  *  o Redistributions of source code must retain the above copyright

    10  * notice, this list of conditions and the following disclaimer.

    11  *

    12  *  o Redistributions in binary form must reproduce the above copyright

    13  * notice, this list of conditions and the following disclaimer in the

    14  * documentation and/or other materials provided with the distribution.

    15  *

    16  *  o Neither the name of Ben Fortuna nor the names of any other contributors

    17  * may be used to endorse or promote products derived from this software

    18  * without specific prior written permission.

    19  *

    20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

    24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    31  */

    32 package net.fortuna.ical4j.util;

    34 import java.net.URI;

    35 import java.net.URISyntaxException;

    36 import java.util.regex.Pattern;

    38 /**

    39  * $Id$

    40  *

    41  * Created on 11/09/2005

    42  *

    43  * Utility methods for working with URIs.

    44  * @author Ben Fortuna

    45  */

    46 public final class Uris {

    48     /**

    49      * URI Scheme used when relaxed parsing is enabled and the given input stream lead to an invalid URI.

    50      */

    51     public static final String INVALID_SCHEME = "net.fortunal.ical4j.invalid";

    53     private static final Pattern CID_PATTERN = Pattern.compile("(?i)^cid:.*");

    54     private static final Pattern NOTES_CID_REPLACEMENT_PATTERN = Pattern.compile("[<>]");

    56     /**

    57      * Constructor made private to enforce static nature.

    58      */

    59     private Uris() {

    60     }

    62     /**

    63      * Encodes the specified URI string using the UTF-8 charset. In the event that an exception is thrown, the specifed

    64      * URI string is returned unmodified.

    65      * @param s a URI string

    66      * @return an encoded URI string

    67      */

    68     public static String encode(final String s) {

    69         /*

    70          * try { return URLEncoder.encode(s, ENCODING_CHARSET); } catch (UnsupportedEncodingException use) {

    71          * log.error("Error ocurred encoding URI [" + s + "]", use); }

    72          */

    74         /*

    75          * Lotus Notes does not correctly strip angle brackets from cid uris. From RFC2392: A "cid" URL is converted to

    76          * the corresponding Content-ID message header [MIME] by removing the "cid:" prefix, converting the % encoded

    77          * character to their equivalent US-ASCII characters, and enclosing the remaining parts with an angle bracket

    78          * pair, "<" and ">". For example, "cid:foo4%25foo1@bar.net" corresponds to Content-ID: <foo4%25foo1@bar.net>

    79          * Reversing the process and converting URL special characters to their % encodings produces the original cid. A

    80          * "mid" URL is converted to a Message-ID or Message-ID/Content-ID pair in a similar fashion.

    81          */

    82         if (CompatibilityHints.isHintEnabled(CompatibilityHints.KEY_NOTES_COMPATIBILITY)

    83         		&& CID_PATTERN.matcher(s).matches()) {

    85             return NOTES_CID_REPLACEMENT_PATTERN.matcher(s).replaceAll("");

    86         }

    87         return s;

    88     }

    90     /**

    91      * Decodes the specified URI string using the UTF-8 charset. In the event that an exception is thrown, the specifed

    92      * URI string is returned unmodified.

    93      * @param s a URI string

    94      * @return an encoded URI string

    95      */

    96     public static String decode(final String s) {

    97         /*

    98          * try { return URLDecoder.decode(s, ENCODING_CHARSET); } catch (UnsupportedEncodingException use) {

    99          * log.error("Error ocurred decoding URI [" + s + "]", use); }

   100          */

   101         return s;

   102     }

   104     /**

   105      * Attempts to create a URI instance and will optionally swallow any resulting URISyntaxException depending on

   106      * configured {@link CompatibilityHints}. Will also automatically attempt encoding of the string representation for

   107      * greater compatibility.

   108      * <p>When relaxed parsing is enabled and if the string representation is not valid, a second URI creation attempt is made

   109      *  by extracting the scheme from the scheme specific part and URI encoding that later part. For example,

   110      *  "mailto: joe smith@example.com" becomes "mailto:joe%20smith@example.com".<p>

   111      * <p>If the second attempts also leads to a {@code URISyntaxException}, an opaque URI is constructed with a scheme

   112      *  of {@code Uris.INVALID_SCHEME} and a value corresponding to the initial representation.</p>

   113      *

   114      * @param s a string representation of a URI.

   115      * @return a URI instance, which may not correspond to the URI string if a valid

   116      *  URI string is not specified and relaxed parsing is enabled.

   117      * @throws URISyntaxException if a valid URI string is not specified and relaxed parsing is disabled

   118      */

   119     public static URI create(final String s) throws URISyntaxException {

   120         try {

   121             return new URI(encode(s));

   122         }

   123         catch (URISyntaxException use) {

   124             if (CompatibilityHints

   125                     .isHintEnabled(CompatibilityHints.KEY_RELAXED_PARSING)) {

   126                 String encoded = encode(s);

   127                 int index = encoded.indexOf(':');

   128                 if (index != -1 && index < encoded.length() -1) {

   129                     try {

   130                         return new URI(encoded.substring(0, index), encoded.substring(index + 1), null);

   131                     } catch (URISyntaxException use2) {

   132                     }

   133                 }

   134                 try {

   135                     return new URI(INVALID_SCHEME, s, null);

   136                 } catch (URISyntaxException use2) {

   137                     // should not happen as we are building an opaque URI

   138                     throw new IllegalArgumentException("Could not build URI from " + s);

   139                 }

   140             }

   141             throw use;

   142         }

   143     }

   144 }

Caldavsync Sources / file revision