catgirl/handle.c

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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <ctype.h>
#include <err.h>
#include <stdarg.h>
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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "chat.h"
// Adapted from <https://github.com/cbreeden/fxhash/blob/master/lib.rs>.
static uint32_t hashChar(uint32_t hash, char ch) {
hash = (hash << 5) | (hash >> 27);
hash ^= ch;
hash *= 0x27220A95;
return hash;
}
static int color(const char *str) {
if (!str) return IRCGray;
uint32_t hash = 0;
for (; str[0]; ++str) {
hash = hashChar(hash, str[0]);
}
while (IRCBlack == (hash & IRCLightGray)) {
hash = hashChar(hash, '\0');
}
return (hash & IRCLightGray);
}
static char *paramField(char **params) {
char *rest = *params;
if (rest[0] == ':') {
*params = NULL;
return &rest[1];
}
return strsep(params, " ");
}
static void shift(
char *prefix, char **nick, char **user, char **host,
char *params, size_t req, size_t opt, /* (char **) */ ...
) {
char *field;
if (prefix) {
field = strsep(&prefix, "!");
if (nick) *nick = field;
field = strsep(&prefix, "@");
if (user) *user = field;
if (host) *host = prefix;
}
va_list ap;
va_start(ap, opt);
for (size_t i = 0; i < req; ++i) {
if (!params) errx(EX_PROTOCOL, "%zu params required, found %zu", req, i);
field = paramField(&params);
char **param = va_arg(ap, char **);
if (param) *param = field;
}
for (size_t i = 0; i < opt; ++i) {
char **param = va_arg(ap, char **);
if (params) {
*param = paramField(&params);
} else {
*param = NULL;
}
}
va_end(ap);
}
static bool isSelf(const char *nick, const char *user) {
if (!user) return false;
if (!strcmp(nick, self.nick)) {
if (strcmp(user, self.user)) selfUser(user);
return true;
}
return false;
}
static bool isPing(const char *mesg) {
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size_t len = strlen(self.nick);
const char *match = mesg;
while (NULL != (match = strcasestr(match, self.nick))) {
char b = (match > mesg ? *(match - 1) : ' ');
char a = (match[len] ? match[len] : ' ');
match = &match[len];
if (!isspace(b) && !ispunct(b)) continue;
if (!isspace(a) && !ispunct(a)) continue;
return true;
}
return false;
}
static char *dequote(char *mesg) {
if (mesg[0] == '"') mesg = &mesg[1];
size_t len = strlen(mesg);
if (mesg[len - 1] == '"') mesg[len - 1] = '\0';
return mesg;
}
typedef void (*Handler)(char *prefix, char *params);
static void handlePing(char *prefix, char *params) {
(void)prefix;
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ircFmt("PONG %s\r\n", params);
}
static void handleReplyErroneousNickname(char *prefix, char *params) {
char *mesg;
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shift(prefix, NULL, NULL, NULL, params, 3, 0, NULL, NULL, &mesg);
uiFmt(TagStatus, UIHot, "You can't use that name here: \"%s\"", mesg);
uiLog(TagStatus, UICold, L"Type /nick <name> to choose a new one");
}
static void handleReplyWelcome(char *prefix, char *params) {
char *nick;
shift(prefix, NULL, NULL, NULL, params, 1, 0, &nick);
if (strcmp(nick, self.nick)) selfNick(nick);
if (self.join) ircFmt("JOIN %s\r\n", self.join);
tabTouch(TagStatus, self.nick);
uiLog(TagStatus, UIWarm, L"You have arrived");
}
static void handleReplyMOTD(char *prefix, char *params) {
char *mesg;
shift(prefix, NULL, NULL, NULL, params, 2, 0, NULL, &mesg);
if (mesg[0] == '-' && mesg[1] == ' ') mesg = &mesg[2];
urlScan(TagStatus, mesg);
uiFmt(TagStatus, UICold, "%s", mesg);
}
static void handleJoin(char *prefix, char *params) {
char *nick, *user, *chan;
shift(prefix, &nick, &user, NULL, params, 1, 0, &chan);
struct Tag tag = tagFor(chan);
if (isSelf(nick, user)) {
tabTouch(TagNone, chan);
uiViewTag(tag);
}
tabTouch(tag, nick);
uiFmt(
tag, UICold,
"\3%d%s\3 arrives in \3%d%s\3",
color(user), nick, color(chan), chan
);
logFmt(tag, NULL, "%s arrives in %s", nick, chan);
}
static void handlePart(char *prefix, char *params) {
char *nick, *user, *chan, *mesg;
shift(prefix, &nick, &user, NULL, params, 1, 1, &chan, &mesg);
struct Tag tag = tagFor(chan);
if (isSelf(nick, user)) {
tabClear(tag);
} else {
tabRemove(tag, nick);
}
if (mesg) {
urlScan(tag, mesg);
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uiFmt(
tag, UICold,
"\3%d%s\3 leaves \3%d%s\3, \"%s\"",
color(user), nick, color(chan), chan, dequote(mesg)
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);
logFmt(tag, NULL, "%s leaves %s, \"%s\"", nick, chan, dequote(mesg));
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} else {
uiFmt(
tag, UICold,
"\3%d%s\3 leaves \3%d%s\3",
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color(user), nick, color(chan), chan
);
logFmt(tag, NULL, "%s leaves %s", nick, chan);
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}
}
static void handleKick(char *prefix, char *params) {
char *nick, *user, *chan, *kick, *mesg;
shift(prefix, &nick, &user, NULL, params, 2, 1, &chan, &kick, &mesg);
struct Tag tag = tagFor(chan);
bool kicked = !strcmp(kick, self.nick);
if (kicked) {
tabClear(tag);
} else {
tabRemove(tag, kick);
}
if (mesg) {
urlScan(tag, mesg);
uiFmt(
tag, (kicked ? UIHot : UICold),
"\3%d%s\3 kicks \3%d%s\3 out of \3%d%s\3, \"%s\"",
color(user), nick, color(kick), kick, color(chan), chan,
dequote(mesg)
);
logFmt(
tag, NULL,
"%s kicks %s out of %s, \"%s\"", nick, kick, chan, dequote(mesg)
);
} else {
uiFmt(
tag, (kicked ? UIHot : UICold),
"\3%d%s\3 kicks \3%d%s\3 out of \3%d%s\3",
color(user), nick, color(kick), kick, color(chan), chan
);
logFmt(tag, NULL, "%s kicks %s out of %s", nick, kick, chan);
}
}
static void handleQuit(char *prefix, char *params) {
char *nick, *user, *mesg;
shift(prefix, &nick, &user, NULL, params, 0, 1, &mesg);
struct Tag tag;
while (TagNone.id != (tag = tabTag(nick)).id) {
tabRemove(tag, nick);
if (mesg) {
urlScan(tag, mesg);
uiFmt(
tag, UICold,
"\3%d%s\3 leaves, \"%s\"",
color(user), nick, dequote(mesg)
);
logFmt(tag, NULL, "%s leaves, \"%s\"", nick, dequote(mesg));
} else {
uiFmt(tag, UICold, "\3%d%s\3 leaves", color(user), nick);
logFmt(tag, NULL, "%s leaves", nick);
}
}
}
static void handleReplyTopic(char *prefix, char *params) {
char *chan, *topic;
shift(prefix, NULL, NULL, NULL, params, 3, 0, NULL, &chan, &topic);
struct Tag tag = tagFor(chan);
urlScan(tag, topic);
uiTopic(tag, topic);
uiFmt(
tag, UICold,
"The sign in \3%d%s\3 reads, \"%s\"",
color(chan), chan, topic
);
logFmt(tag, NULL, "The sign in %s reads, \"%s\"", chan, topic);
}
static void handleTopic(char *prefix, char *params) {
char *nick, *user, *chan, *topic;
shift(prefix, &nick, &user, NULL, params, 2, 0, &chan, &topic);
struct Tag tag = tagFor(chan);
if (!isSelf(nick, user)) tabTouch(tag, nick);
urlScan(tag, topic);
uiTopic(tag, topic);
uiFmt(
tag, UICold,
"\3%d%s\3 places a new sign in \3%d%s\3, \"%s\"",
color(user), nick, color(chan), chan, topic
);
logFmt(tag, NULL, "%s places a new sign in %s, \"%s\"", nick, chan, topic);
}
static void handleReplyEndOfNames(char *prefix, char *params) {
char *chan;
shift(prefix, NULL, NULL, NULL, params, 2, 0, NULL, &chan);
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ircFmt("WHO %s\r\n", chan);
}
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static struct {
char buf[4096];
size_t len;
} who;
static void handleReplyWho(char *prefix, char *params) {
char *chan, *user, *nick;
shift(
prefix, NULL, NULL, NULL,
params, 6, 0, NULL, &chan, &user, NULL, NULL, &nick
);
struct Tag tag = tagFor(chan);
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tabAdd(tag, nick);
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size_t cap = sizeof(who.buf) - who.len;
int len = snprintf(
&who.buf[who.len], cap,
"%s\3%d%s\3",
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(who.len ? ", " : ""), color(user), nick
);
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if ((size_t)len < cap) who.len += len;
}
static void handleReplyEndOfWho(char *prefix, char *params) {
char *chan;
shift(prefix, NULL, NULL, NULL, params, 2, 0, NULL, &chan);
struct Tag tag = tagFor(chan);
uiFmt(
tag, UICold,
"In \3%d%s\3 are %s",
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color(chan), chan, who.buf
);
who.len = 0;
}
static void handleNick(char *prefix, char *params) {
char *prev, *user, *next;
shift(prefix, &prev, &user, NULL, params, 1, 0, &next);
if (isSelf(prev, user)) selfNick(next);
struct Tag tag;
while (TagNone.id != (tag = tabTag(prev)).id) {
tabReplace(tag, prev, next);
uiFmt(
tag, UICold,
"\3%d%s\3 is now known as \3%d%s\3",
color(user), prev, color(user), next
);
logFmt(tag, NULL, "%s is now known as %s", prev, next);
}
}
static void handleCTCP(struct Tag tag, char *nick, char *user, char *mesg) {
mesg = &mesg[1];
char *ctcp = strsep(&mesg, " ");
char *params = strsep(&mesg, "\1");
if (strcmp(ctcp, "ACTION")) return;
bool self = isSelf(nick, user);
if (!self) tabTouch(tag, nick);
urlScan(tag, params);
bool ping = !self && isPing(params);
uiFmt(
tag, (ping ? UIHot : UIWarm),
"%c\3%d* %s\17 %s",
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ping["\17\26"], color(user), nick, params
);
logFmt(tag, NULL, "* %s %s", nick, params);
}
static void handlePrivmsg(char *prefix, char *params) {
char *nick, *user, *chan, *mesg;
shift(prefix, &nick, &user, NULL, params, 2, 0, &chan, &mesg);
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bool direct = !strcmp(chan, self.nick);
struct Tag tag = (direct ? tagFor(nick) : tagFor(chan));
if (mesg[0] == '\1') {
handleCTCP(tag, nick, user, mesg);
return;
}
bool self = isSelf(nick, user);
if (!self) tabTouch(tag, nick);
urlScan(tag, mesg);
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bool hot = !self && (direct || isPing(mesg));
bool ping = !self && isPing(mesg);
uiFmt(
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tag, (hot ? UIHot : UIWarm),
"%c\3%d%c%s%c\17 %s",
ping["\17\26"], color(user), self["<("], nick, self[">)"], mesg
);
logFmt(tag, NULL, "<%s> %s", nick, mesg);
}
static void handleNotice(char *prefix, char *params) {
char *nick, *user, *chan, *mesg;
shift(prefix, &nick, &user, NULL, params, 2, 0, &chan, &mesg);
struct Tag tag = TagStatus;
if (user) tag = (strcmp(chan, self.nick) ? tagFor(chan) : tagFor(nick));
bool self = isSelf(nick, user);
if (!self) tabTouch(tag, nick);
urlScan(tag, mesg);
bool ping = !self && isPing(mesg);
uiFmt(
tag, (ping ? UIHot : UIWarm),
"%c\3%d-%s-\17 %s",
ping["\17\26"], color(user), nick, mesg
);
logFmt(tag, NULL, "-%s- %s", nick, mesg);
}
static const struct {
const char *command;
Handler handler;
} Handlers[] = {
{ "001", handleReplyWelcome },
{ "315", handleReplyEndOfWho },
{ "332", handleReplyTopic },
{ "352", handleReplyWho },
{ "366", handleReplyEndOfNames },
{ "372", handleReplyMOTD },
{ "375", handleReplyMOTD },
{ "432", handleReplyErroneousNickname },
{ "433", handleReplyErroneousNickname },
{ "JOIN", handleJoin },
{ "KICK", handleKick },
{ "NICK", handleNick },
{ "NOTICE", handleNotice },
{ "PART", handlePart },
{ "PING", handlePing },
{ "PRIVMSG", handlePrivmsg },
{ "QUIT", handleQuit },
{ "TOPIC", handleTopic },
};
static const size_t HandlersLen = sizeof(Handlers) / sizeof(Handlers[0]);
void handle(char *line) {
char *prefix = NULL;
if (line[0] == ':') {
prefix = strsep(&line, " ") + 1;
if (!line) errx(EX_PROTOCOL, "unexpected eol");
}
char *command = strsep(&line, " ");
for (size_t i = 0; i < HandlersLen; ++i) {
if (strcmp(command, Handlers[i].command)) continue;
Handlers[i].handler(prefix, line);
break;
}
}