aboutsummaryrefslogtreecommitdiffstats
path: root/src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java
blob: a15abe14a86fc8603c19a2858ad0045f08f50258 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
package eu.siacs.conversations.xmpp.jid;

import android.util.LruCache;

import net.java.otr4j.session.SessionID;

import java.net.IDN;

import eu.siacs.conversations.Config;
import gnu.inet.encoding.Stringprep;
import gnu.inet.encoding.StringprepException;

/**
 * The `Jid' class provides an immutable representation of a JID.
 */
public final class Jid {

	private static LruCache<String,Jid> cache = new LruCache<>(1024);

	private final String localpart;
	private final String domainpart;
	private final String resourcepart;

	// It's much more efficient to store the ful JID as well as the parts instead of figuring them
	// all out every time (since some characters are displayed but aren't used for comparisons).
	private final String displayjid;

	public String getLocalpart() {
		return localpart;
	}

	public String getDomainpart() {
		return IDN.toUnicode(domainpart);
	}

	public String getResourcepart() {
		return resourcepart;
	}

	public static Jid fromSessionID(final SessionID id) throws InvalidJidException{
		if (id.getUserID().isEmpty()) {
			return Jid.fromString(id.getAccountID());
		} else {
			return Jid.fromString(id.getAccountID()+"/"+id.getUserID());
		}
	}

	public static Jid fromString(final String jid) throws InvalidJidException {
		return Jid.fromString(jid, false);
	}

	public static Jid fromString(final String jid, final boolean safe) throws InvalidJidException {
		return new Jid(jid, safe);
	}

	public static Jid fromParts(final String localpart,
			final String domainpart,
			final String resourcepart) throws InvalidJidException {
		String out;
		if (localpart == null || localpart.isEmpty()) {
			out = domainpart;
		} else {
			out = localpart + "@" + domainpart;
		}
		if (resourcepart != null && !resourcepart.isEmpty()) {
			out = out + "/" + resourcepart;
		}
		return new Jid(out, false);
	}

	private Jid(final String jid, final boolean safe) throws InvalidJidException {
		if (jid == null) throw new InvalidJidException(InvalidJidException.IS_NULL);

		Jid fromCache = Jid.cache.get(jid);
		if (fromCache != null) {
			displayjid = fromCache.displayjid;
			localpart = fromCache.localpart;
			domainpart = fromCache.domainpart;
			resourcepart = fromCache.resourcepart;
			return;
		}

		// Hackish Android way to count the number of chars in a string... should work everywhere.
		final int atCount = jid.length() - jid.replace("@", "").length();
		final int slashCount = jid.length() - jid.replace("/", "").length();

		// Throw an error if there's anything obvious wrong with the JID...
		if (jid.isEmpty() || jid.length() > 3071) {
			throw new InvalidJidException(InvalidJidException.INVALID_LENGTH);
		}

		// Go ahead and check if the localpart or resourcepart is empty.
		if (jid.startsWith("@") || (jid.endsWith("@") && slashCount == 0) || jid.startsWith("/") || (jid.endsWith("/") && slashCount < 2)) {
			throw new InvalidJidException(InvalidJidException.INVALID_CHARACTER);
		}

		String finaljid;

		final int domainpartStart;
		final int atLoc = jid.indexOf("@");
		final int slashLoc = jid.indexOf("/");
		// If there is no "@" in the JID (eg. "example.net" or "example.net/resource")
		// or there are one or more "@" signs but they're all in the resourcepart (eg. "example.net/@/rp@"):
		if (atCount == 0 || (atCount > 0 && slashLoc != -1 && atLoc > slashLoc)) {
			localpart = "";
			finaljid = "";
			domainpartStart = 0;
		} else {
			final String lp = jid.substring(0, atLoc);
			try {
				localpart = Config.DISABLE_STRING_PREP || safe ? lp : Stringprep.nodeprep(lp);
			} catch (final StringprepException e) {
				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
			}
			if (localpart.isEmpty() || localpart.length() > 1023) {
				throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
			}
			domainpartStart = atLoc + 1;
			finaljid = lp + "@";
		}

		final String dp;
		if (slashCount > 0) {
			final String rp = jid.substring(slashLoc + 1, jid.length());
			try {
				resourcepart = Config.DISABLE_STRING_PREP || safe ? rp : Stringprep.resourceprep(rp);
			} catch (final StringprepException e) {
				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
			}
			if (resourcepart.isEmpty() || resourcepart.length() > 1023) {
				throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
			}
			try {
				dp = IDN.toUnicode(Stringprep.nameprep(jid.substring(domainpartStart, slashLoc)), IDN.USE_STD3_ASCII_RULES);
			} catch (final StringprepException e) {
				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
			}
			finaljid = finaljid + dp + "/" + rp;
		} else {
			resourcepart = "";
			try{
				dp = IDN.toUnicode(Stringprep.nameprep(jid.substring(domainpartStart, jid.length())), IDN.USE_STD3_ASCII_RULES);
			} catch (final StringprepException e) {
				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
			}
			finaljid = finaljid + dp;
		}

		// Remove trailing "." before storing the domain part.
		if (dp.endsWith(".")) {
			try {
				domainpart = IDN.toASCII(dp.substring(0, dp.length() - 1), IDN.USE_STD3_ASCII_RULES);
			} catch (final IllegalArgumentException e) {
				throw new InvalidJidException(e);
			}
		} else {
			try {
				domainpart = IDN.toASCII(dp, IDN.USE_STD3_ASCII_RULES);
			} catch (final IllegalArgumentException e) {
				throw new InvalidJidException(e);
			}
		}

		// TODO: Find a proper domain validation library; validate individual parts, separators, etc.
		if (domainpart.isEmpty() || domainpart.length() > 1023) {
			throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
		}

		Jid.cache.put(jid, this);

		this.displayjid = finaljid;
	}

	public Jid toBareJid() {
		try {
			return resourcepart.isEmpty() ? this : fromParts(localpart, domainpart, "");
		} catch (final InvalidJidException e) {
			// This should never happen.
			throw new AssertionError("Jid " + this.toString() + " invalid");
		}
	}

	public Jid toDomainJid() {
		try {
			return resourcepart.isEmpty() && localpart.isEmpty() ? this : fromString(getDomainpart());
		} catch (final InvalidJidException e) {
			// This should never happen.
			throw new AssertionError("Jid " + this.toString() + " invalid");
		}
	}

	@Override
	public String toString() {
		return displayjid;
	}

	@Override
	public boolean equals(final Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;

		final Jid jid = (Jid) o;

		return jid.hashCode() == this.hashCode();
	}

	@Override
	public int hashCode() {
		int result = localpart.hashCode();
		result = 31 * result + domainpart.hashCode();
		result = 31 * result + resourcepart.hashCode();
		return result;
	}

	public boolean hasLocalpart() {
		return !localpart.isEmpty();
	}

	public boolean isBareJid() {
		return this.resourcepart.isEmpty();
	}

	public boolean isDomainJid() {
		return !this.hasLocalpart();
	}
}