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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.net;
     18 
     19 import static android.util.Patterns.GOOD_IRI_CHAR;
     20 
     21 import java.util.regex.Matcher;
     22 import java.util.regex.Pattern;
     23 
     24 /**
     25  * {@hide}
     26  *
     27  * Web Address Parser
     28  *
     29  * This is called WebAddress, rather than URL or URI, because it
     30  * attempts to parse the stuff that a user will actually type into a
     31  * browser address widget.
     32  *
     33  * Unlike java.net.uri, this parser will not choke on URIs missing
     34  * schemes.  It will only throw a ParseException if the input is
     35  * really hosed.
     36  *
     37  * If given an https scheme but no port, fills in port
     38  *
     39  */
     40 public class WebAddress {
     41 
     42     private final static String LOGTAG = "http";
     43 
     44     public String mScheme;
     45     public String mHost;
     46     public int mPort;
     47     public String mPath;
     48     public String mAuthInfo;
     49 
     50     static final int MATCH_GROUP_SCHEME = 1;
     51     static final int MATCH_GROUP_AUTHORITY = 2;
     52     static final int MATCH_GROUP_HOST = 3;
     53     static final int MATCH_GROUP_PORT = 4;
     54     static final int MATCH_GROUP_PATH = 5;
     55 
     56     static Pattern sAddressPattern = Pattern.compile(
     57             /* scheme    */ "(?:(http|https|file)\\:\\/\\/)?" +
     58             /* authority */ "(?:([-A-Za-z0-9$_.+!*'(),;?&=]+(?:\\:[-A-Za-z0-9$_.+!*'(),;?&=]+)?)@)?" +
     59             /* host      */ "([-" + GOOD_IRI_CHAR + "%_]+(?:\\.[-" + GOOD_IRI_CHAR + "%_]+)*|\\[[0-9a-fA-F:\\.]+\\])?" +
     60             /* port      */ "(?:\\:([0-9]*))?" +
     61             /* path      */ "(\\/?[^#]*)?" +
     62             /* anchor    */ ".*", Pattern.CASE_INSENSITIVE);
     63 
     64     /** parses given uriString. */
     65     public WebAddress(String address) throws ParseException {
     66         if (address == null) {
     67             throw new NullPointerException();
     68         }
     69 
     70         // android.util.Log.d(LOGTAG, "WebAddress: " + address);
     71 
     72         mScheme = "";
     73         mHost = "";
     74         mPort = -1;
     75         mPath = "/";
     76         mAuthInfo = "";
     77 
     78         Matcher m = sAddressPattern.matcher(address);
     79         String t;
     80         if (m.matches()) {
     81             t = m.group(MATCH_GROUP_SCHEME);
     82             if (t != null) mScheme = t.toLowerCase();
     83             t = m.group(MATCH_GROUP_AUTHORITY);
     84             if (t != null) mAuthInfo = t;
     85             t = m.group(MATCH_GROUP_HOST);
     86             if (t != null) mHost = t;
     87             t = m.group(MATCH_GROUP_PORT);
     88             if (t != null && t.length() > 0) {
     89                 // The ':' character is not returned by the regex.
     90                 try {
     91                     mPort = Integer.parseInt(t);
     92                 } catch (NumberFormatException ex) {
     93                     throw new ParseException("Bad port");
     94                 }
     95             }
     96             t = m.group(MATCH_GROUP_PATH);
     97             if (t != null && t.length() > 0) {
     98                 /* handle busted myspace frontpage redirect with
     99                    missing initial "/" */
    100                 if (t.charAt(0) == '/') {
    101                     mPath = t;
    102                 } else {
    103                     mPath = "/" + t;
    104                 }
    105             }
    106 
    107         } else {
    108             // nothing found... outa here
    109             throw new ParseException("Bad address");
    110         }
    111 
    112         /* Get port from scheme or scheme from port, if necessary and
    113            possible */
    114         if (mPort == 443 && mScheme.equals("")) {
    115             mScheme = "https";
    116         } else if (mPort == -1) {
    117             if (mScheme.equals("https"))
    118                 mPort = 443;
    119             else
    120                 mPort = 80; // default
    121         }
    122         if (mScheme.equals("")) mScheme = "http";
    123     }
    124 
    125     public String toString() {
    126         String port = "";
    127         if ((mPort != 443 && mScheme.equals("https")) ||
    128             (mPort != 80 && mScheme.equals("http"))) {
    129             port = ":" + Integer.toString(mPort);
    130         }
    131         String authInfo = "";
    132         if (mAuthInfo.length() > 0) {
    133             authInfo = mAuthInfo + "@";
    134         }
    135 
    136         return mScheme + "://" + authInfo + mHost + port + mPath;
    137     }
    138 }
    139