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"use strict";
const { utf8Encode, utf8DecodeWithoutBOM } = require("./encoding");
const { percentDecodeBytes, utf8PercentEncodeString, isURLEncodedPercentEncode } = require("./percent-encoding");
function p(char) {
return char.codePointAt(0);
}
// https://url.spec.whatwg.org/#concept-urlencoded-parser
function parseUrlencoded(input) {
const sequences = strictlySplitByteSequence(input, p("&"));
const output = [];
for (const bytes of sequences) {
if (bytes.length === 0) {
continue;
}
let name, value;
const indexOfEqual = bytes.indexOf(p("="));
if (indexOfEqual >= 0) {
name = bytes.slice(0, indexOfEqual);
value = bytes.slice(indexOfEqual + 1);
} else {
name = bytes;
value = new Uint8Array(0);
}
name = replaceByteInByteSequence(name, 0x2B, 0x20);
value = replaceByteInByteSequence(value, 0x2B, 0x20);
const nameString = utf8DecodeWithoutBOM(percentDecodeBytes(name));
const valueString = utf8DecodeWithoutBOM(percentDecodeBytes(value));
output.push([nameString, valueString]);
}
return output;
}
// https://url.spec.whatwg.org/#concept-urlencoded-string-parser
function parseUrlencodedString(input) {
return parseUrlencoded(utf8Encode(input));
}
// https://url.spec.whatwg.org/#concept-urlencoded-serializer
function serializeUrlencoded(tuples) {
// TODO: accept and use encoding argument
let output = "";
for (const [i, tuple] of tuples.entries()) {
const name = utf8PercentEncodeString(tuple[0], isURLEncodedPercentEncode, true);
const value = utf8PercentEncodeString(tuple[1], isURLEncodedPercentEncode, true);
if (i !== 0) {
output += "&";
}
output += `${name}=${value}`;
}
return output;
}
function strictlySplitByteSequence(buf, cp) {
const list = [];
let last = 0;
let i = buf.indexOf(cp);
while (i >= 0) {
list.push(buf.slice(last, i));
last = i + 1;
i = buf.indexOf(cp, last);
}
if (last !== buf.length) {
list.push(buf.slice(last));
}
return list;
}
function replaceByteInByteSequence(buf, from, to) {
let i = buf.indexOf(from);
while (i >= 0) {
buf[i] = to;
i = buf.indexOf(from, i + 1);
}
return buf;
}
module.exports = {
parseUrlencodedString,
serializeUrlencoded
};
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