File size: 4,224 Bytes
fc93158 | 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 | import { randomUUID } from "node:crypto";
import { hasIrcControlChars, stripIrcControlChars } from "./control-chars.js";
const IRC_TARGET_PATTERN = /^[^\s:]+$/u;
export type ParsedIrcLine = {
raw: string;
prefix?: string;
command: string;
params: string[];
trailing?: string;
};
export type ParsedIrcPrefix = {
nick?: string;
user?: string;
host?: string;
server?: string;
};
export function parseIrcLine(line: string): ParsedIrcLine | null {
const raw = line.replace(/[\r\n]+/g, "").trim();
if (!raw) {
return null;
}
let cursor = raw;
let prefix: string | undefined;
if (cursor.startsWith(":")) {
const idx = cursor.indexOf(" ");
if (idx <= 1) {
return null;
}
prefix = cursor.slice(1, idx);
cursor = cursor.slice(idx + 1).trimStart();
}
if (!cursor) {
return null;
}
const firstSpace = cursor.indexOf(" ");
const command = (firstSpace === -1 ? cursor : cursor.slice(0, firstSpace)).trim();
if (!command) {
return null;
}
cursor = firstSpace === -1 ? "" : cursor.slice(firstSpace + 1);
const params: string[] = [];
let trailing: string | undefined;
while (cursor.length > 0) {
cursor = cursor.trimStart();
if (!cursor) {
break;
}
if (cursor.startsWith(":")) {
trailing = cursor.slice(1);
break;
}
const spaceIdx = cursor.indexOf(" ");
if (spaceIdx === -1) {
params.push(cursor);
break;
}
params.push(cursor.slice(0, spaceIdx));
cursor = cursor.slice(spaceIdx + 1);
}
return {
raw,
prefix,
command: command.toUpperCase(),
params,
trailing,
};
}
export function parseIrcPrefix(prefix?: string): ParsedIrcPrefix {
if (!prefix) {
return {};
}
const nickPart = prefix.match(/^([^!@]+)!([^@]+)@(.+)$/);
if (nickPart) {
return {
nick: nickPart[1],
user: nickPart[2],
host: nickPart[3],
};
}
const nickHostPart = prefix.match(/^([^@]+)@(.+)$/);
if (nickHostPart) {
return {
nick: nickHostPart[1],
host: nickHostPart[2],
};
}
if (prefix.includes("!")) {
const [nick, user] = prefix.split("!", 2);
return { nick, user };
}
if (prefix.includes(".")) {
return { server: prefix };
}
return { nick: prefix };
}
function decodeLiteralEscapes(input: string): string {
// Defensive: this is not a full JS string unescaper.
// It's just enough to catch common "\r\n" / "\u0001" style payloads.
return input
.replace(/\\r/g, "\r")
.replace(/\\n/g, "\n")
.replace(/\\t/g, "\t")
.replace(/\\0/g, "\0")
.replace(/\\x([0-9a-fA-F]{2})/g, (_, hex) => String.fromCharCode(Number.parseInt(hex, 16)))
.replace(/\\u([0-9a-fA-F]{4})/g, (_, hex) => String.fromCharCode(Number.parseInt(hex, 16)));
}
export function sanitizeIrcOutboundText(text: string): string {
const decoded = decodeLiteralEscapes(text);
return stripIrcControlChars(decoded.replace(/\r?\n/g, " ")).trim();
}
export function sanitizeIrcTarget(raw: string): string {
const decoded = decodeLiteralEscapes(raw);
if (!decoded) {
throw new Error("IRC target is required");
}
// Reject any surrounding whitespace instead of trimming it away.
if (decoded !== decoded.trim()) {
throw new Error(`Invalid IRC target: ${raw}`);
}
if (hasIrcControlChars(decoded)) {
throw new Error(`Invalid IRC target: ${raw}`);
}
if (!IRC_TARGET_PATTERN.test(decoded)) {
throw new Error(`Invalid IRC target: ${raw}`);
}
return decoded;
}
export function splitIrcText(text: string, maxChars = 350): string[] {
const cleaned = sanitizeIrcOutboundText(text);
if (!cleaned) {
return [];
}
if (cleaned.length <= maxChars) {
return [cleaned];
}
const chunks: string[] = [];
let remaining = cleaned;
while (remaining.length > maxChars) {
let splitAt = remaining.lastIndexOf(" ", maxChars);
if (splitAt < Math.floor(maxChars * 0.5)) {
splitAt = maxChars;
}
chunks.push(remaining.slice(0, splitAt).trim());
remaining = remaining.slice(splitAt).trimStart();
}
if (remaining) {
chunks.push(remaining);
}
return chunks.filter(Boolean);
}
export function makeIrcMessageId() {
return randomUUID();
}
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