1package eu.siacs.conversations.xmpp.jid;
2
3import net.java.otr4j.session.SessionID;
4
5import java.net.IDN;
6
7import gnu.inet.encoding.Stringprep;
8import gnu.inet.encoding.StringprepException;
9
10/**
11 * The `Jid' class provides an immutable representation of a JID.
12 */
13public final class Jid {
14
15 private final String localpart;
16 private final String domainpart;
17 private final String resourcepart;
18
19 // It's much more efficient to store the ful JID as well as the parts instead of figuring them
20 // all out every time (since some characters are displayed but aren't used for comparisons).
21 private final String displayjid;
22
23 public String getLocalpart() {
24 return localpart;
25 }
26
27 public String getDomainpart() {
28 return IDN.toUnicode(domainpart);
29 }
30
31 public String getResourcepart() {
32 return resourcepart;
33 }
34
35 public static Jid fromSessionID(SessionID id) throws InvalidJidException{
36 if (id.getUserID().isEmpty()) {
37 return Jid.fromString(id.getAccountID());
38 } else {
39 return Jid.fromString(id.getAccountID()+"/"+id.getUserID());
40 }
41 }
42
43 public static Jid fromString(final String jid) throws InvalidJidException {
44 return new Jid(jid);
45 }
46
47 public static Jid fromParts(final String localpart,
48 final String domainpart,
49 final String resourcepart) throws InvalidJidException {
50 String out;
51 if (localpart == null || localpart.isEmpty()) {
52 out = domainpart;
53 } else {
54 out = localpart + "@" + domainpart;
55 }
56 if (resourcepart != null && !resourcepart.isEmpty()) {
57 out = out + "/" + resourcepart;
58 }
59 return new Jid(out);
60 }
61
62 private Jid(final String jid) throws InvalidJidException {
63 // Hackish Android way to count the number of chars in a string... should work everywhere.
64 final int atCount = jid.length() - jid.replace("@", "").length();
65 final int slashCount = jid.length() - jid.replace("/", "").length();
66
67 // Throw an error if there's anything obvious wrong with the JID...
68 if (jid.isEmpty() || jid.length() > 3071) {
69 throw new InvalidJidException(InvalidJidException.INVALID_LENGTH);
70 }
71
72 // Go ahead and check if the localpart or resourcepart is empty.
73 if (jid.startsWith("@") || jid.endsWith("@") ||
74 jid.startsWith("/") || jid.endsWith("/")) {
75 throw new InvalidJidException(InvalidJidException.INVALID_CHARACTER);
76 }
77
78 String finaljid;
79
80 final int domainpartStart;
81 if (atCount >= 1) {
82 final int atLoc = jid.indexOf("@");
83 final String lp = jid.substring(0, atLoc);
84 try {
85 localpart = Stringprep.nodeprep(lp);
86 } catch (final StringprepException e) {
87 throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
88 }
89 if (localpart.isEmpty() || localpart.length() > 1023) {
90 throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
91 }
92 domainpartStart = atLoc + 1;
93 finaljid = lp + "@";
94 } else {
95 localpart = "";
96 finaljid = "";
97 domainpartStart = 0;
98 }
99
100 final String dp;
101 if (slashCount >= 1) {
102 final int slashLoc = jid.indexOf("/");
103 final String rp = jid.substring(slashLoc + 1, jid.length());
104 try {
105 resourcepart = Stringprep.resourceprep(rp);
106 } catch (final StringprepException e) {
107 throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
108 }
109 if (resourcepart.isEmpty() || resourcepart.length() > 1023) {
110 throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
111 }
112 dp = IDN.toUnicode(jid.substring(domainpartStart, slashLoc), IDN.USE_STD3_ASCII_RULES);
113 finaljid = finaljid + dp + "/" + rp;
114 } else {
115 resourcepart = "";
116 dp = IDN.toUnicode(jid.substring(domainpartStart, jid.length()),
117 IDN.USE_STD3_ASCII_RULES);
118 finaljid = finaljid + dp;
119 }
120
121 // Remove trailing "." before storing the domain part.
122 if (dp.endsWith(".")) {
123 try {
124 domainpart = IDN.toASCII(dp.substring(0, dp.length() - 1), IDN.USE_STD3_ASCII_RULES);
125 } catch (final IllegalArgumentException e) {
126 throw new InvalidJidException(e);
127 }
128 } else {
129 try {
130 domainpart = IDN.toASCII(dp, IDN.USE_STD3_ASCII_RULES);
131 } catch (final IllegalArgumentException e) {
132 throw new InvalidJidException(e);
133 }
134 }
135
136 // TODO: Find a proper domain validation library; validate individual parts, separators, etc.
137 if (domainpart.isEmpty() || domainpart.length() > 1023) {
138 throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
139 }
140
141 this.displayjid = finaljid;
142 }
143
144 public Jid toBareJid() {
145 try {
146 return resourcepart.isEmpty() ? this : fromParts(localpart, domainpart, "");
147 } catch (final InvalidJidException e) {
148 // This should never happen.
149 return null;
150 }
151 }
152
153 public Jid toDomainJid() {
154 try {
155 return resourcepart.isEmpty() && localpart.isEmpty() ? this : fromString(getDomainpart());
156 } catch (final InvalidJidException e) {
157 // This should never happen.
158 return null;
159 }
160 }
161
162 @Override
163 public String toString() {
164 return displayjid;
165 }
166
167 @Override
168 public boolean equals(final Object o) {
169 if (this == o) return true;
170 if (o == null || getClass() != o.getClass()) return false;
171
172 final Jid jid = (Jid) o;
173
174 return jid.hashCode() == this.hashCode();
175 }
176
177 @Override
178 public int hashCode() {
179 int result = localpart.hashCode();
180 result = 31 * result + domainpart.hashCode();
181 result = 31 * result + resourcepart.hashCode();
182 return result;
183 }
184
185 public boolean hasLocalpart() {
186 return !localpart.isEmpty();
187 }
188
189 public boolean isBareJid() {
190 return this.resourcepart.isEmpty();
191 }
192}