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source: nick.c @ 1a2c1c0

Last change on this file since 1a2c1c0 was 1a2c1c0, checked in by Wilmer van der Gaast <wilmer@…>, at 2013-06-16T12:42:39Z
Merging utf8-nicks branch. This adds a utf8_nicks setting which removes the ASCII restriction on contact nicknames. Use at your own risk!
Property mode set to `100644`
File size: 9.9 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2012 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/* Some stuff to fetch, save and handle nicknames for your buddies */
8
9	/*
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License with
21	the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
22	if not, write to the Free Software Foundation, Inc., 59 Temple Place,
23	Suite 330, Boston, MA 02111-1307 USA
24	*/
25
26	#define BITLBEE_CORE
27	#include "bitlbee.h"
28
29	/* Character maps, _lc_[x] == _uc_[x] (but uppercase), according to the RFC's.
30	With one difference, we allow dashes. These are used to do uc/lc conversions
31	and strip invalid chars. */
32	static char *nick_lc_chars = "0123456789abcdefghijklmnopqrstuvwxyz{}^`-_\|";
33	static char *nick_uc_chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ[]~`-_\\";
34
35	/* Store handles in lower case and strip spaces, because AIM is braindead. */
36	static char clean_handle( const char orig )
37	{
38	char *new = g_malloc( strlen( orig ) + 1 );
39	int i = 0;
40
41	do {
42	if (*orig != ' ')
43	new[i++] = tolower( *orig );
44	}
45	while (*(orig++));
46
47	return new;
48	}
49
50	void nick_set_raw( account_t acc, const char handle, const char *nick )
51	{
52	char store_handle, store_nick = g_malloc( MAX_NICK_LENGTH + 1 );
53	irc_t irc = (irc_t ) acc->bee->ui_data;
54
55	store_handle = clean_handle( handle );
56	store_nick[MAX_NICK_LENGTH] = '\0';
57	strncpy( store_nick, nick, MAX_NICK_LENGTH );
58	nick_strip( irc, store_nick );
59
60	g_hash_table_replace( acc->nicks, store_handle, store_nick );
61	}
62
63	void nick_set( bee_user_t bu, const char nick )
64	{
65	nick_set_raw( bu->ic->acc, bu->handle, nick );
66	}
67
68	char nick_get( bee_user_t bu )
69	{
70	static char nick[MAX_NICK_LENGTH+1];
71	char store_handle, found_nick;
72	irc_t irc = (irc_t ) bu->bee->ui_data;
73
74	memset( nick, 0, MAX_NICK_LENGTH + 1 );
75
76	store_handle = clean_handle( bu->handle );
77	/* Find out if we stored a nick for this person already. If not, try
78	to generate a sane nick automatically. */
79	if( ( found_nick = g_hash_table_lookup( bu->ic->acc->nicks, store_handle ) ) )
80	{
81	strncpy( nick, found_nick, MAX_NICK_LENGTH );
82	}
83	else if( ( found_nick = nick_gen( bu ) ) )
84	{
85	strncpy( nick, found_nick, MAX_NICK_LENGTH );
86	g_free( found_nick );
87	}
88	else
89	{
90	/* Keep this fallback since nick_gen() can return NULL in some cases. */
91	char *s;
92
93	g_snprintf( nick, MAX_NICK_LENGTH, "%s", bu->handle );
94	if( ( s = strchr( nick, '@' ) ) )
95	while( *s )
96	*(s++) = 0;
97
98	nick_strip( irc, nick );
99	if( set_getbool( &bu->bee->set, "lcnicks" ) )
100	nick_lc( irc, nick );
101	}
102	g_free( store_handle );
103
104	/* Make sure the nick doesn't collide with an existing one by adding
105	underscores and that kind of stuff, if necessary. */
106	nick_dedupe( bu, nick );
107
108	return nick;
109	}
110
111	char nick_gen( bee_user_t bu )
112	{
113	gboolean ok = FALSE; /* Set to true once the nick contains something unique. */
114	GString *ret = g_string_sized_new( MAX_NICK_LENGTH + 1 );
115	char *rets;
116	irc_t irc = (irc_t ) bu->bee->ui_data;
117	char *fmt = set_getstr( &bu->ic->acc->set, "nick_format" ) ? :
118	set_getstr( &bu->bee->set, "nick_format" );
119
120	while( fmt && *fmt && ret->len < MAX_NICK_LENGTH )
121	{
122	char part = NULL, chop = '\0', asc = NULL;
123
124	if( *fmt != '%' )
125	{
126	g_string_append_c( ret, *fmt );
127	fmt ++;
128	continue;
129	}
130
131	fmt ++;
132	while( *fmt )
133	{
134	/* -char means chop off everything from char */
135	if( *fmt == '-' )
136	{
137	chop = fmt[1];
138	if( chop == '\0' )
139	{
140	g_string_free( ret, TRUE );
141	return NULL;
142	}
143	fmt += 2;
144	}
145	else if( g_strncasecmp( fmt, "nick", 4 ) == 0 )
146	{
147	part = bu->nick ? : bu->handle;
148	fmt += 4;
149	ok \|= TRUE;
150	break;
151	}
152	else if( g_strncasecmp( fmt, "handle", 6 ) == 0 )
153	{
154	part = bu->handle;
155	fmt += 6;
156	ok \|= TRUE;
157	break;
158	}
159	else if( g_strncasecmp( fmt, "full_name", 9 ) == 0 )
160	{
161	part = bu->fullname;
162	fmt += 9;
163	ok \|= part && *part;
164	break;
165	}
166	else if( g_strncasecmp( fmt, "first_name", 10 ) == 0 )
167	{
168	part = bu->fullname;
169	fmt += 10;
170	ok \|= part && *part;
171	chop = ' ';
172	break;
173	}
174	else if( g_strncasecmp( fmt, "group", 5 ) == 0 )
175	{
176	part = bu->group ? bu->group->name : NULL;
177	fmt += 5;
178	break;
179	}
180	else if( g_strncasecmp( fmt, "account", 7 ) == 0 )
181	{
182	part = bu->ic->acc->tag;
183	fmt += 7;
184	break;
185	}
186	else
187	{
188	g_string_free( ret, TRUE );
189	return NULL;
190	}
191	}
192
193	if( !part )
194	continue;
195
196	/* Credits to Josay_ in #bitlbee for this idea. //TRANSLIT
197	should do lossy/approximate conversions, so letters with
198	accents don't just get stripped. Note that it depends on
199	LC_CTYPE being set to something other than C/POSIX. */
200	if( !( irc && irc->status & IRC_UTF8_NICKS ) )
201	part = asc = g_convert_with_fallback( part, -1, "ASCII//TRANSLIT",
202	"UTF-8", "", NULL, NULL, NULL );
203
204	if( part )
205	g_string_append( ret, part );
206	g_free( asc );
207	}
208
209	rets = g_string_free( ret, FALSE );
210	if( ok && rets && *rets )
211	{
212	nick_strip( irc, rets );
213	rets[MAX_NICK_LENGTH] = '\0';
214	return rets;
215	}
216	g_free( rets );
217	return NULL;
218	}
219
220	void nick_dedupe( bee_user_t *bu, char nick[MAX_NICK_LENGTH+1] )
221	{
222	irc_t irc = (irc_t) bu->bee->ui_data;
223	int inf_protection = 256;
224	irc_user_t *iu;
225
226	/* Now, find out if the nick is already in use at the moment, and make
227	subtle changes to make it unique. */
228	while( !nick_ok( irc, nick ) \|\|
229	( ( iu = irc_user_by_name( irc, nick ) ) && iu->bu != bu ) )
230	{
231	if( strlen( nick ) < ( MAX_NICK_LENGTH - 1 ) )
232	{
233	nick[strlen(nick)+1] = 0;
234	nick[strlen(nick)] = '_';
235	}
236	else
237	{
238	nick[0] ++;
239	}
240
241	if( inf_protection-- == 0 )
242	{
243	g_snprintf( nick, MAX_NICK_LENGTH + 1, "xx%x", rand() );
244
245	irc_rootmsg( irc, "Warning: Something went wrong while trying "
246	"to generate a nickname for contact %s on %s.",
247	bu->handle, bu->ic->acc->tag );
248	irc_rootmsg( irc, "This might be a bug in BitlBee, or the result "
249	"of a faulty nick_format setting. Will use %s "
250	"instead.", nick );
251
252	break;
253	}
254	}
255	}
256
257	/* Just check if there is a nickname set for this buddy or if we'd have to
258	generate one. */
259	int nick_saved( bee_user_t *bu )
260	{
261	char store_handle, found;
262
263	store_handle = clean_handle( bu->handle );
264	found = g_hash_table_lookup( bu->ic->acc->nicks, store_handle );
265	g_free( store_handle );
266
267	return found != NULL;
268	}
269
270	void nick_del( bee_user_t *bu )
271	{
272	g_hash_table_remove( bu->ic->acc->nicks, bu->handle );
273	}
274
275
276	void nick_strip( irc_t irc, char nick )
277	{
278	int len = 0;
279
280	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
281	{
282	gunichar c;
283	char p = nick, n, tmp[strlen(nick)+1];
284
285	while( p && *p )
286	{
287	c = g_utf8_get_char_validated( p, -1 );
288	n = g_utf8_find_next_char( p, NULL );
289
290	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
291	strchr( nick_uc_chars, c ) ) ) \|\|
292	!g_unichar_isgraph( c ) )
293	{
294	strcpy( tmp, n );
295	strcpy( p, tmp );
296	}
297	else
298	p = n;
299	}
300	if( p )
301	len = p - nick;
302	}
303	else
304	{
305	int i;
306
307	for( i = len = 0; nick[i] && len < MAX_NICK_LENGTH; i++ )
308	{
309	if( strchr( nick_lc_chars, nick[i] ) \|\|
310	strchr( nick_uc_chars, nick[i] ) )
311	{
312	nick[len] = nick[i];
313	len++;
314	}
315	}
316	}
317	if( isdigit( nick[0] ) )
318	{
319	char *orig;
320
321	/* First character of a nick can't be a digit, so insert an
322	underscore if necessary. */
323	orig = g_strdup( nick );
324	g_snprintf( nick, MAX_NICK_LENGTH, "_%s", orig );
325	g_free( orig );
326	len ++;
327	}
328	while( len <= MAX_NICK_LENGTH )
329	nick[len++] = '\0';
330	}
331
332	gboolean nick_ok( irc_t irc, const char nick )
333	{
334	const char *s;
335
336	/* Empty/long nicks are not allowed, nor numbers at [0] */
337	if( !*nick \|\| isdigit( nick[0] ) \|\| strlen( nick ) > MAX_NICK_LENGTH )
338	return 0;
339
340	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
341	{
342	gunichar c;
343	const char p = nick, n;
344
345	while( p && *p )
346	{
347	c = g_utf8_get_char_validated( p, -1 );
348	n = g_utf8_find_next_char( p, NULL );
349
350	if( ( c < 0x7f && !( strchr( nick_lc_chars, c ) \|\|
351	strchr( nick_uc_chars, c ) ) ) \|\|
352	!g_unichar_isgraph( c ) )
353	{
354	return FALSE;
355	}
356	p = n;
357	}
358	}
359	else
360	{
361	for( s = nick; *s; s ++ )
362	if( !strchr( nick_lc_chars, s ) && !strchr( nick_uc_chars, s ) )
363	return FALSE;
364	}
365
366	return TRUE;
367	}
368
369	int nick_lc( irc_t irc, char nick )
370	{
371	static char tab[128] = { 0 };
372	int i;
373
374	if( tab['A'] == 0 )
375	for( i = 0; nick_lc_chars[i]; i ++ )
376	{
377	tab[(int)nick_uc_chars[i]] = nick_lc_chars[i];
378	tab[(int)nick_lc_chars[i]] = nick_lc_chars[i];
379	}
380
381	if( irc && ( irc->status & IRC_UTF8_NICKS ) )
382	{
383	gchar *down = g_utf8_strdown( nick, -1 );
384	if( strlen( down ) > strlen( nick ) )
385	{
386	/* Well crap. Corrupt it if we have to. */
387	down[strlen(nick)] = '\0';
388	}
389	strcpy( nick, down );
390	g_free( down );
391	}
392
393	for( i = 0; nick[i]; i ++ )
394	if( nick[i] < 0x7f )
395	nick[i] = tab[(int)nick[i]];
396
397	return nick_ok( irc, nick );
398	}
399
400	int nick_cmp( irc_t irc, const char a, const char *b )
401	{
402	char aa[1024] = "", bb[1024] = "";
403
404	strncpy( aa, a, sizeof( aa ) - 1 );
405	strncpy( bb, b, sizeof( bb ) - 1 );
406	if( nick_lc( irc, aa ) && nick_lc( irc, bb ) )
407	{
408	return( strcmp( aa, bb ) );
409	}
410	else
411	{
412	return( -1 ); /* Hmm... Not a clear answer.. :-/ */
413	}
414	}

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