tildefriends/core/http.js

function parseUrl(url) {
	// XXX: Hack.
	let match = url.match(new RegExp("(\\w+)://([^/]+)?(.*)"));
	return {
		protocol: match[1],
		host: match[2],
		path: match[3],
		port: match[1] == "http" ? 80 : 443,
	};
}

function parseResponse(data) {
	let firstLine;
	let headers = {};

	while (true) {
		let endLine = data.indexOf('\r\n');
		let line = data.substring(0, endLine);
		if (!firstLine) {
			firstLine = line;
		} else if (!line.length) {
			break;
		} else {
			let colon = line.indexOf(":");
			headers[line.substring(colon)] = line.substring(colon + 1);
		}
		data = data.substring(endLine + 2);
	}
	return {body: data};
}

export function fetch(url, options) {
	let parsed = parseUrl(url);
	return new Promise(function(resolve, reject) {
		let socket = new Socket();
		let buffer = new Uint8Array(0)

		return socket.connect(parsed.host, parsed.port).then(function() {
			socket.read(function(data) {
				if (data) {
					let newBuffer = new Uint8Array(buffer.length + data.length);
					newBuffer.set(buffer, 0);
					newBuffer.set(data, buffer.length);
					buffer = newBuffer;
				} else {
					resolve(parseResponse(utf8Decode(buffer)));
				}
			});

			if (parsed.port == 443) {
				return socket.startTls();
			}
		}).then(function() {
			socket.write(`${options?.method ?? 'GET'} ${parsed.path} HTTP/1.0\r\nHost: ${parsed.host}\r\nConnection: close\r\n\r\n`);
			socket.shutdown();
		}).catch(function(error) {
			reject(error);
		});
	});
}