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/* Copyright (C) 2020 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#include <err.h>
#include <fnmatch.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "chat.h"
struct Filter filters[FilterCap];
static size_t len;
struct Filter filterParse(enum Heat heat, char *pattern) {
struct Filter filter = { .heat = heat };
filter.mask = strsep(&pattern, " ");
filter.cmd = strsep(&pattern, " ");
filter.chan = strsep(&pattern, " ");
filter.mesg = pattern;
return filter;
}
struct Filter filterAdd(enum Heat heat, const char *pattern) {
if (len == FilterCap) errx(EX_CONFIG, "filter limit exceeded");
char *own;
if (!strchr(pattern, '!') && !strchr(pattern, ' ')) {
int n = asprintf(&own, "%s!*@*", pattern);
if (n < 0) err(EX_OSERR, "asprintf");
} else {
own = strdup(pattern);
if (!own) err(EX_OSERR, "strdup");
}
struct Filter filter = filterParse(heat, own);
filters[len++] = filter;
return filter;
}
bool filterRemove(struct Filter filter) {
bool found = false;
for (size_t i = len - 1; i < len; --i) {
if (filters[i].heat != filter.heat) continue;
if (!filters[i].cmd != !filter.cmd) continue;
if (!filters[i].chan != !filter.chan) continue;
if (!filters[i].mesg != !filter.mesg) continue;
if (strcasecmp(filters[i].mask, filter.mask)) continue;
if (filter.cmd && strcasecmp(filters[i].cmd, filter.cmd)) continue;
if (filter.chan && strcasecmp(filters[i].chan, filter.chan)) continue;
if (filter.mesg && strcasecmp(filters[i].mesg, filter.mesg)) continue;
free(filters[i].mask);
memmove(&filters[i], &filters[i + 1], sizeof(*filters) * --len);
filters[len] = (struct Filter) {0};
found = true;
}
return found;
}
static bool filterTest(
struct Filter filter, const char *mask, uint id, const struct Message *msg
) {
if (fnmatch(filter.mask, mask, FNM_CASEFOLD)) return false;
if (!filter.cmd) return true;
if (fnmatch(filter.cmd, msg->cmd, FNM_CASEFOLD)) return false;
if (!filter.chan) return true;
if (fnmatch(filter.chan, idNames[id], FNM_CASEFOLD)) return false;
if (!filter.mesg) return true;
if (!msg->params[1]) return false;
return !fnmatch(filter.mesg, msg->params[1], FNM_CASEFOLD);
}
enum { IcedCap = 8 };
static struct {
size_t len;
char *msgIDs[IcedCap];
} iced;
static void icedPush(const char *msgID) {
if (!msgID) return;
size_t i = iced.len % IcedCap;
free(iced.msgIDs[i]);
iced.msgIDs[i] = strdup(msgID);
if (!iced.msgIDs[i]) err(EX_OSERR, "strdup");
iced.len++;
}
enum Heat filterCheck(enum Heat heat, uint id, const struct Message *msg) {
if (!len) return heat;
if (msg->tags[TagReply]) {
for (size_t i = 0; i < IcedCap; ++i) {
if (!iced.msgIDs[i]) continue;
if (strcmp(msg->tags[TagReply], iced.msgIDs[i])) continue;
icedPush(msg->tags[TagMsgID]);
return Ice;
}
}
char mask[512];
snprintf(mask, sizeof(mask), "%s!%s@%s", msg->nick, msg->user, msg->host);
for (size_t i = 0; i < len; ++i) {
if (!filterTest(filters[i], mask, id, msg)) continue;
if (filters[i].heat == Ice) icedPush(msg->tags[TagMsgID]);
return filters[i].heat;
}
return heat;
}
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