107 lines
2.7 KiB
JavaScript
107 lines
2.7 KiB
JavaScript
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"use strict";
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const { utf8Encode, utf8DecodeWithoutBOM } = require("./encoding");
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const { percentDecodeBytes, utf8PercentEncodeString, isURLEncodedPercentEncode } = require("./percent-encoding");
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function p(char) {
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return char.codePointAt(0);
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}
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// https://url.spec.whatwg.org/#concept-urlencoded-parser
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function parseUrlencoded(input) {
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const sequences = strictlySplitByteSequence(input, p("&"));
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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, value;
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const indexOfEqual = bytes.indexOf(p("="));
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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 = new Uint8Array(0);
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}
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name = replaceByteInByteSequence(name, 0x2B, 0x20);
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value = replaceByteInByteSequence(value, 0x2B, 0x20);
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const nameString = utf8DecodeWithoutBOM(percentDecodeBytes(name));
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const valueString = utf8DecodeWithoutBOM(percentDecodeBytes(value));
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output.push([nameString, valueString]);
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}
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return output;
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}
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// https://url.spec.whatwg.org/#concept-urlencoded-string-parser
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function parseUrlencodedString(input) {
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return parseUrlencoded(utf8Encode(input));
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}
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// https://url.spec.whatwg.org/#concept-urlencoded-serializer
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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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// TODO "get the output encoding", i.e. handle encoding labels vs. names.
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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 = utf8PercentEncodeString(tuple[0], isURLEncodedPercentEncode, true);
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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 = utf8PercentEncodeString(value, isURLEncodedPercentEncode, true);
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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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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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module.exports = {
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parseUrlencodedString,
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serializeUrlencoded
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};
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