@aikidosec/firewall
Version:
Zen by Aikido is an embedded Application Firewall that autonomously protects Node.js apps against common and critical attacks, provides rate limiting, detects malicious traffic (including bots), and more.
104 lines (103 loc) • 2.95 kB
JavaScript
;
// Node has always utf-8
const utf8Decoder = new TextDecoder("utf-8");
const textDecoders = new Map([
["utf-8", utf8Decoder],
["utf8", utf8Decoder],
]);
function getDecoder(charset) {
let lc;
while (true) {
switch (charset) {
case "utf-8":
case "utf8":
return decoders.utf8;
case "latin1":
case "ascii": // TODO: Make these a separate, strict decoder?
case "us-ascii":
case "iso-8859-1":
case "iso8859-1":
case "iso88591":
case "iso_8859-1":
case "windows-1252":
case "iso_8859-1:1987":
case "cp1252":
case "x-cp1252":
return decoders.latin1;
case "utf16le":
case "utf-16le":
case "ucs2":
case "ucs-2":
return decoders.utf16le;
case "base64":
return decoders.base64;
default:
if (lc === undefined) {
lc = true;
charset = charset.toLowerCase();
continue;
}
return decoders.other.bind(charset);
}
}
}
const decoders = {
utf8: (data, sourceEncoding) => {
if (data.length === 0) {
return "";
}
if (typeof data === "string") {
data = Buffer.from(data, sourceEncoding);
}
return data.utf8Slice(0, data.length);
},
latin1: (data, sourceEncoding) => {
if (data.length === 0) {
return "";
}
if (typeof data === "string") {
return data;
}
return data.latin1Slice(0, data.length);
},
utf16le: (data, sourceEncoding) => {
if (data.length === 0) {
return "";
}
if (typeof data === "string") {
data = Buffer.from(data, sourceEncoding);
}
return data.ucs2Slice(0, data.length);
},
base64: (data, sourceEncoding) => {
if (data.length === 0) {
return "";
}
if (typeof data === "string") {
data = Buffer.from(data, sourceEncoding);
}
return data.base64Slice(0, data.length);
},
other: (data, sourceEncoding) => {
if (data.length === 0) {
return "";
}
if (typeof data === "string") {
data = Buffer.from(data, sourceEncoding);
}
if (textDecoders.has(this.toString())) {
try {
return textDecoders.get(this).decode(data);
}
catch { }
}
return typeof data === "string" ? data : data.toString();
},
};
function decodeText(text, sourceEncoding, destEncoding) {
if (text) {
return getDecoder(destEncoding)(text, sourceEncoding);
}
return text;
}
module.exports = decodeText;