feat: Initial clean release of CHM

packages/lib/net-utils.ts

@@ -0,0 +1,114 @@
+import shim from './shim';
+
+export async function ip() {
+	const response = await shim.fetch('https://api.ipify.org/?format=json');
+	if (!response.ok) {
+		throw new Error(`Could not retrieve IP: ${await response.text()}`);
+	}
+
+	const ip = await response.json();
+	return ip.ip;
+}
+
+interface TcpPortUsed {
+	check(port: number): Promise<boolean>;
+}
+
+export async function findAvailablePort(tcpPortUsed: TcpPortUsed, possiblePorts: number[], extraRandomPortsToTry = 20) {
+	for (let i = 0; i < extraRandomPortsToTry; i++) {
+		possiblePorts.push(Math.floor(8000 + Math.random() * 2000));
+	}
+
+	let port = null;
+	for (let i = 0; i < possiblePorts.length; i++) {
+		const inUse = await tcpPortUsed.check(possiblePorts[i]);
+		if (!inUse) {
+			port = possiblePorts[i];
+			break;
+		}
+	}
+	return port;
+}
+
+export function mimeTypeFromHeaders(headers: Record<string, string>) {
+	if (!headers || !headers['content-type']) return null;
+
+	const splitted = headers['content-type'].split(';');
+	return splitted[0].trim().toLowerCase();
+}
+
+
+const httpStatusCodes_: Record<number, string> = {
+	100: 'Continue',
+	101: 'Switching Protocols',
+	102: 'Processing',
+	103: 'Early Hints',
+	200: 'OK',
+	201: 'Created',
+	202: 'Accepted',
+	203: 'Non-Authoritative Information',
+	204: 'No Content',
+	205: 'Reset Content',
+	206: 'Partial Content',
+	207: 'Multi-Status',
+	208: 'Already Reported',
+	226: 'IM Used',
+	300: 'Multiple Choices',
+	301: 'Moved Permanently',
+	302: 'Found',
+	303: 'See Other',
+	304: 'Not Modified',
+	305: 'Use Proxy',
+	307: 'Temporary Redirect',
+	308: 'Permanent Redirect',
+	400: 'Bad Request',
+	401: 'Unauthorized',
+	402: 'Payment Required',
+	403: 'Forbidden',
+	404: 'Not Found',
+	405: 'Method Not Allowed',
+	406: 'Not Acceptable',
+	407: 'Proxy Authentication Required',
+	408: 'Request Timeout',
+	409: 'Conflict',
+	410: 'Gone',
+	411: 'Length Required',
+	412: 'Precondition Failed',
+	413: 'Payload Too Large',
+	414: 'URI Too Long',
+	415: 'Unsupported Media Type',
+	416: 'Range Not Satisfiable',
+	417: 'Expectation Failed',
+	418: 'I\'m a Teapot',
+	421: 'Misdirected Request',
+	422: 'Unprocessable Entity',
+	423: 'Locked',
+	424: 'Failed Dependency',
+	425: 'Too Early',
+	426: 'Upgrade Required',
+	428: 'Precondition Required',
+	429: 'Too Many Requests',
+	431: 'Request Header Fields Too Large',
+	451: 'Unavailable For Legal Reasons',
+	500: 'Internal Server Error',
+	501: 'Not Implemented',
+	502: 'Bad Gateway',
+	503: 'Service Unavailable',
+	504: 'Gateway Timeout',
+	505: 'HTTP Version Not Supported',
+	506: 'Variant Also Negotiates',
+	507: 'Insufficient Storage',
+	508: 'Loop Detected',
+	509: 'Bandwidth Limit Exceeded',
+	510: 'Not Extended',
+	511: 'Network Authentication Required',
+};
+
+export function getHttpStatusMessage(statusCode: number): string {
+	const msg = httpStatusCodes_[statusCode];
+
+	// We don't throw an exception since a server can send any arbitrary error code
+	if (!msg) return 'Unknown status code';
+
+	return msg;
+}