WebAddress.java revision 2257440f4b261cfc3251a6fc0f3cbd1fa1e548b1 
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
17package android.net;
18
19import static android.util.Patterns.GOOD_IRI_CHAR;
20
21import java.util.regex.Matcher;
22import 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 */
40public 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|HTTP|https|HTTPS|file|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    */ ".*");
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;
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