139 lines
3.3 KiB
JavaScript
139 lines
3.3 KiB
JavaScript
"use strict";
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const { isASCIIHex } = require("./infra");
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function strictlySplitByteSequence(buf, cp) {
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const list = [];
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let last = 0;
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let i = buf.indexOf(cp);
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while (i >= 0) {
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list.push(buf.slice(last, i));
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last = i + 1;
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i = buf.indexOf(cp, last);
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}
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if (last !== buf.length) {
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list.push(buf.slice(last));
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}
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return list;
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}
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function replaceByteInByteSequence(buf, from, to) {
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let i = buf.indexOf(from);
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while (i >= 0) {
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buf[i] = to;
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i = buf.indexOf(from, i + 1);
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}
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return buf;
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}
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function percentEncode(c) {
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let hex = c.toString(16).toUpperCase();
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if (hex.length === 1) {
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hex = "0" + hex;
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}
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return "%" + hex;
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}
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function percentDecode(input) {
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const output = Buffer.alloc(input.byteLength);
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let ptr = 0;
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for (let i = 0; i < input.length; ++i) {
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if (input[i] !== 37 || !isASCIIHex(input[i + 1]) || !isASCIIHex(input[i + 2])) {
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output[ptr++] = input[i];
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} else {
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output[ptr++] = parseInt(input.slice(i + 1, i + 3).toString(), 16);
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i += 2;
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}
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}
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return output.slice(0, ptr);
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}
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function parseUrlencoded(input) {
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const sequences = strictlySplitByteSequence(input, 38);
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const output = [];
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for (const bytes of sequences) {
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if (bytes.length === 0) {
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continue;
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}
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let name;
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let value;
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const indexOfEqual = bytes.indexOf(61);
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if (indexOfEqual >= 0) {
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name = bytes.slice(0, indexOfEqual);
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value = bytes.slice(indexOfEqual + 1);
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} else {
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name = bytes;
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value = Buffer.alloc(0);
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}
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name = replaceByteInByteSequence(Buffer.from(name), 43, 32);
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value = replaceByteInByteSequence(Buffer.from(value), 43, 32);
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output.push([percentDecode(name).toString(), percentDecode(value).toString()]);
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}
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return output;
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}
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function serializeUrlencodedByte(input) {
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let output = "";
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for (const byte of input) {
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if (byte === 32) {
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output += "+";
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} else if (byte === 42 ||
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byte === 45 ||
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byte === 46 ||
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byte >= 48 && byte <= 57 ||
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byte >= 65 && byte <= 90 ||
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byte === 95 ||
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byte >= 97 && byte <= 122) {
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output += String.fromCodePoint(byte);
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} else {
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output += percentEncode(byte);
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}
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}
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return output;
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}
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function serializeUrlencoded(tuples, encodingOverride = undefined) {
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let encoding = "utf-8";
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if (encodingOverride !== undefined) {
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encoding = encodingOverride;
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}
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let output = "";
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for (const [i, tuple] of tuples.entries()) {
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// TODO: handle encoding override
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const name = serializeUrlencodedByte(Buffer.from(tuple[0]));
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let value = tuple[1];
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if (tuple.length > 2 && tuple[2] !== undefined) {
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if (tuple[2] === "hidden" && name === "_charset_") {
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value = encoding;
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} else if (tuple[2] === "file") {
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// value is a File object
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value = value.name;
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}
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}
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value = serializeUrlencodedByte(Buffer.from(value));
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if (i !== 0) {
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output += "&";
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}
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output += `${name}=${value}`;
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}
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return output;
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}
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module.exports = {
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percentEncode,
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percentDecode,
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// application/x-www-form-urlencoded string parser
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parseUrlencoded(input) {
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return parseUrlencoded(Buffer.from(input));
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},
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// application/x-www-form-urlencoded serializer
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serializeUrlencoded
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};
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